WO2020143571A1

WO2020143571A1 - Synchronization method and apparatus

Info

Publication number: WO2020143571A1
Application number: PCT/CN2020/070456
Authority: WO
Inventors: 张旭; 刘建琴
Original assignee: 华为技术有限公司
Priority date: 2019-01-09
Filing date: 2020-01-06
Publication date: 2020-07-16
Also published as: CN111432465A; CN111432465B

Abstract

The present application provides a synchronization method, comprising: a first communication device receives a first message sent by a second communication device; the first communication device obtains first sending time information, the first sending time information being used for indicating a time when the second communication device sends the first message; the first communication device obtains first receiving time information, the first receiving time information being used for indicating a time when the first communication device receives the first message; the first communication device obtains a first time offset according to the first sending time information and the first receiving time information. The method can weaken the influence of transmission delay on message transmission and improve the synchronization accuracy between the first communication device and the second communication device.

Description

Synchronization method and device

This application requires the priority of the Chinese patent application filed on January 9, 2019, filed by the State Intellectual Property Office of China with the application number 201910021229.6 and the application name as "a synchronization method and device", the entire contents of which are incorporated by reference in this application in.

Technical field

This application relates to the field of communications, and more specifically, to a synchronization method and device.

Background technique

As communication systems and business requirements continue to upgrade, the accuracy of synchronization requirements between network devices and terminal devices in communication services is also increasing. In general, if there is a wired connection between different network devices, the synchronization accuracy between the network devices is high, which can meet the requirements of services for synchronization accuracy. However, due to limitations such as operator and environment deployment, when there is no wired connection between different network devices, the synchronization accuracy between network devices is low, which affects the synchronization accuracy between terminal devices and cannot meet the synchronization accuracy requirements of communication services. Therefore, there is an urgent need for a synchronization method of network devices to improve the synchronization accuracy between network devices without wired connections.

Summary of the invention

The present application provides a method and device for synchronizing a communication device, and aims to improve the synchronization accuracy between the communication device and the communication device.

In a first aspect, a synchronization method is provided. The method includes: a first communication device receives a first message sent by a second communication device; the first communication device obtains first transmission time information, and the first transmission time information is used for Indicating the time when the second communication device sends the first message; the first communication device acquiring first reception time information, where the first reception time information is used to indicate the time when the first communication device receives the first message; The first communication device acquires the first time offset according to the first transmission time information and the first reception time information.

In the embodiment of the present application, the first communication device receives the first message sent by the second communication device, and obtains the first time offset according to the sending time and the receiving time of the first message, so that the first message can be obtained The transmission delay of the first message from the second communication device to the first communication device weakens the influence of the transmission delay on message transmission, and improves the synchronization accuracy between the first communication device and the second communication device. For example, the first communication device may send a message in advance according to the first time offset, and the message may arrive at the second communication device before a specified time, or the first communication device and/or the second communication device may Processes or executes the received information instructions to achieve synchronization under synchronization.

In a possible implementation manner of the first aspect, the first message carries the first sending time information; the first communication device acquiring the first sending time information includes: the first communication device acquiring the first sending time information The first sending time information carried in the message.

In the embodiment of the present application, the second communication device does not need another message to indicate the first transmission time information, and the first communication device may directly obtain the first transmission time information from the first message. This can reduce transmission signaling.

In a possible implementation manner of the first aspect, before the first communication device obtains the first transmission time information, the method further includes: the first communication device receives the first time message sent by the second communication device, The first time message carries the first sending time information; the first communication device acquiring the first sending time information includes: the first communication device acquiring the first sending time information carried by the first time message.

In the embodiment of the present application, the second communication device uses another message to separately send the first transmission time information, which can increase the flexibility of the first communication device to obtain the first transmission time information, and can reduce the first message The payload of the carried information simplifies the channel design of the first message.

In a possible implementation manner of the first aspect, the first communication device acquiring the first sending time information includes: the first communication device determining a resource for transmitting the first message; the first communication device according to the first The resource of the message obtains the first sending time information. The resource of the first message includes at least one of a time domain resource, a frequency domain resource, and a code domain resource.

In the embodiment of the present application, the first communication device can determine the resource of the first message by some means (for example, detecting message resources, etc.); further, the first communication device can obtain the first message according to the resource of the first message Send time information. In this way, the second communication device does not need another message to separately send the first sending time information, which can reduce transmission signaling. Moreover, since the first message does not need to carry additional indication information, the channel design of the first message can be simplified, and the detection success rate of detecting the first message can be improved.

In a possible implementation manner of the first aspect, the first communication device acquiring the first transmission time information includes: the first communication device determining the first transmission time information.

In the embodiment of the present application, on the one hand, the first communication device may determine the first transmission time information by itself based on the existing information; on the other hand, the second communication device does not need another message to separately send the first transmission Time information can reduce transmission signaling.

In a possible implementation manner of the first aspect, the method further includes: the first communication device sends a second time message, where the second time message is used to indicate the first sending time information.

In the embodiment of the present application, the second communication device may send the first message according to the first transmission time information indicated by the second time message, which improves the ability of the first communication device to actively determine the first transmission time information flexibility.

In a possible implementation manner of the first aspect, before the first communication device receives the first message sent by the second communication device, the method further includes: the first communication device sends a first resource message, the first The resource message is used to indicate the resource used by the second communication device to send the first message. The resource of the first message includes at least one of a time domain resource, a frequency domain resource, and a code domain resource.

In the embodiment of the present application, the first communication device may specify a resource for the second communication device to send the first message, and the first communication device may determine an appropriate time to receive the first message. Therefore, the energy consumption for the first communication device to wait to receive the first message can be reduced.

In a possible implementation manner of the first aspect, the method further includes: the first communication device obtains a first reference offset, where the first reference offset is a time offset of the first reference and the second reference The first reference is the reference of the second communication device, and the second reference is the reference of the first communication device; the first communication device obtains the first reference according to the first transmission time information and the first reception time information A time offset includes: the first communication device acquires the first time offset according to the first transmission time information, the first reception time information, and the first reference offset.

In the embodiment of the present application, when the first reference is inconsistent with the second reference (for example, the clock of the first communication device is inconsistent with the clock of the second communication device), only according to the first transmission time information The first time offset obtained from the first reception time information is inaccurate. On the one hand, combining the first sending time information, the first receiving time information, and the first reference offset, the obtained first time offset is more accurate. On the other hand, when the first reference and the second reference do not change, repeatedly using the first reference offset can reduce the signaling overhead of acquiring the first time offset.

In a possible implementation manner of the first aspect, the first sending time information is an offset of the first time-domain reference position relative to the time-domain position at which the second communication device sends the first message; in the first Before a communication device obtains the first time offset according to the first transmission time information and the first reception time information, the method further includes: the first communication device sends a second message; the first communication device according to the first A communication device sends the time domain position of the second message to obtain a second time domain reference position.

In the embodiment of the present application, combining the first sending time information and the first receiving time information can offset the time offset between the first time domain reference position and the second time domain reference position, thereby obtaining more accurate The first time offset.

In a possible implementation manner of the first aspect, the second time domain reference position is a time domain position where the first communication device sends the second message.

In the embodiment of the present application, the first communication device determines that the second time domain reference position is the time domain position where the first communication device sends the second message, and the second communication device may determine the first time domain reference position The time domain location for the second communication device to receive the second message. In this way, signaling related to the first time domain reference position and the second time domain reference position can be avoided, that is, signaling overhead is reduced.

In a possible implementation manner of the first aspect, before the first communication device obtains the second time-domain reference position according to the time-domain position of the second message sent by the first communication device, the method further includes: The first communication device acquires a second reception time, and the second reception time is an offset of the first time domain reference position relative to the time domain position at which the second communication device receives the second message; the first communication The device obtaining the second time domain reference position according to the time domain position of the second message sent by the first communication device includes: the first communication device according to the time domain position of the second message sent by the first communication device and the first At the second receiving time, obtain the second time domain reference position.

In the embodiment of the present application, the first communication device may determine the second time domain reference position based on the first time domain reference position determined by the second communication device, thereby improving the second communication device's determination of the first time domain Reference location flexibility.

In a possible implementation manner of the first aspect, the first message carries information indicating the second reception time; obtaining the second reception time by the first communication device includes: the first communication device according to the first The information indicating the second receiving time carried in a message obtains the second receiving time.

In the embodiment of the present application, the second communication device does not need another message to indicate the second reception time, and the first communication device may directly obtain the second reception time from the first message. This can reduce transmission signaling.

In a possible implementation manner of the first aspect, the method further includes: the first communication device receives a third time message, and the third time message carries information indicating the second reception time; the first communication device Obtaining the second reception time includes: the first communication device acquiring the second reception time according to the information indicating the second reception time carried in the third time message.

In the embodiment of the present application, the second communication device uses another message to indicate the second reception time, which can increase the flexibility of the first communication device to obtain the second reception time, and can reduce the information carried in the first message. Payload, simplify the channel design of the first message.

In a possible implementation manner of the first aspect, before the first communication device sends the second message, the method further includes: the first communication device receives the second resource message sent by the second communication device, the first The second resource message is used to indicate the resource used by the first communication device to send the second message, and the resource of the second message includes at least one of time domain resource, frequency domain resource, and code domain resource; the first communication device Sending the second message includes the first communication device sending the second message according to the second resource message.

In the embodiment of the present application, the first communication device sends the second message according to resources designated by the second communication device, and the second communication device may determine an appropriate time to receive the second message. Therefore, the energy consumption for the second communication device to wait to receive the second message can be reduced.

In a possible implementation manner of the first aspect, the first time offset meets:

Where A is the first time offset, t′ _{1 is} the offset of the second time domain reference position relative to the time domain position of the first communication device receiving the first message, and t _{1 is} the first time offset The offset of a time domain reference position relative to the time domain position at which the second communication device sends the first message, K is a real number less than 2, or greater than 2, or equal to 2.

In a possible implementation manner of the first aspect, the method further includes: the first communication device acquiring the first reference offset according to the first transmission time information and the first reception time information, the first reference The offset is the time offset between the first time domain reference position and the second time domain reference position.

In the embodiment of the present application, the first communication device uses the first transmission time information and the first reception time information to not only accurately calculate the first time offset, but also obtain the first reference offset . For example, it is convenient to align the first time domain reference position with the second time domain reference position; for another example, after aligning the first time domain reference position with the second time domain reference position, it can be Signaling of the first time offset.

In a possible implementation manner of the first aspect, the first reference offset meets:

Where B is the first reference offset, t′ _{1 is} the offset of the second time-domain reference position relative to the time-domain position of the first communication device receiving the first message, and t _{1 is} the first The offset of a time domain reference position relative to the time domain position at which the second communication device sends the first message, K is a real number less than 2, or greater than 2, or equal to 2.

In a possible implementation manner of the first aspect, the first sending time information is an offset of the first time-domain reference position relative to the time-domain position at which the second communication device sends the first message; in the first Before a communication device obtains the first time offset according to the first transmission time information and the first reception time information, the method further includes: the first communication device obtains the second time domain reference position; the first communication The device sends a third message and a third sending time, where the third sending time is an offset of the second time-domain reference position relative to the time-domain position at which the first communication device sends the third message.

In an embodiment of the present application, on the one hand, combining the first sending time information and the first receiving time information can offset the time offset between the first time domain reference position and the second time domain reference position, thereby further Obtain the first time offset accurately. On the other hand, the second communication device may determine the first time domain reference position based on the second time domain reference position determined by the first communication device, thereby improving the determination of the second time domain reference by the first communication device Location flexibility.

In a possible implementation manner of the first aspect, the third message carries information indicating the third sending time.

In the embodiment of the present application, the first communication device does not need another message to indicate the third transmission time, and the second communication device may directly obtain the third transmission time from the third message. This can reduce transmission signaling.

In a possible implementation manner of the first aspect, before the first communication device obtains the first time offset according to the first transmission time information and the first reception time information, the method further includes: A communication device sends a third sending time message, and the third sending time message carries information indicating the third sending time.

In the embodiment of the present application, the first communication device uses another message to indicate the information of the third transmission time, which can increase the flexibility of the second communication device to obtain the third transmission time, and can reduce the third message. The payload of information simplifies the channel design of the third message.

In a possible implementation manner of the first aspect, before the first communication device sends the third message, the method further includes: the first communication device receives the third resource message sent by the second communication device, the first Three resource messages are used to indicate the resources used by the first communication device to send the third message, and the resources of the third message include at least one of time domain resources, frequency domain resources, and code domain resources; the first communication device Sending the third message includes: the first communication device sends the third message according to the third resource message.

In the embodiment of the present application, the first communication device sends the third message according to resources designated by the second communication device, and the second communication device may determine an appropriate time to receive the third message. Therefore, the energy consumption for the second communication device to wait to receive the third message can be reduced.

In the embodiment of the present application, the first communication device uses the acquired first transmission time information and the first reception time information to not only accurately calculate the first time offset, but also obtain the first Reference offset. For example, it is convenient to align the first time domain reference position with the second time domain reference position; for another example, after aligning the first time domain reference position with the second time domain reference position, it can be Signaling of the first time offset.

In a possible implementation manner of the first aspect, before the first communication device obtains the first time offset according to the first transmission time information and the first reception time information, the method further includes: A communication device sends a fourth message; the first communication device obtains fourth transmission time information, and the fourth transmission time information is used to indicate the time when the first communication device sends the fourth message; the first communication device obtains the fourth message Receiving time information, the fourth receiving time information is used to indicate the time when the second communication device receives the fourth message; the first communication device obtains the first according to the first sending time information and the first receiving time information The time offset includes: the first communication device acquires the first time offset according to the first transmission time information, the first reception time information, the fourth transmission time information, and the fourth reception time information.

In the embodiment of the present application, the first communication device acquires the first time offset according to the first transmission time information, the first reception time information, the fourth transmission time information, and the fourth reception time information, The synchronization error caused by the inconsistency between the reference of the first communication device and the reference of the second communication device can be offset, and the acquired first time offset is more accurate.

In a possible implementation manner of the first aspect, the first message carries the fourth reception time information; obtaining the fourth reception time information by the first communication device includes: the first communication device obtaining the first reception time information The fourth receiving time information carried in the message.

In the embodiment of the present application, the second communication device does not need another message to indicate the fourth reception time information, and the first communication device may directly obtain the fourth reception time information from the first message. This can reduce transmission signaling.

In a possible implementation manner of the first aspect, the method further includes: the first communication device receives a fourth time message, and the fourth time message is used to indicate the fourth reception time information; the first communication device obtains The fourth reception time information includes: the first communication device acquiring the fourth reception time information indicated by the fourth time message.

In the embodiment of the present application, the second communication device uses another message to separately send the fourth reception time information, which can increase the flexibility of the first communication device to obtain the fourth reception time information, and can reduce the information carried in the first message Load, simplify the channel design of the first message.

Where A is the first time offset, T′ _{1 is} the moment when the first communication device receives the first message, T _{1 is} the moment when the second communication device sends the first message, and T′ ₄ is The moment when the second communication device receives the fourth message, T _{4 is} the moment when the first communication device sends the fourth message, and K is a real number less than 2, or greater than 2, or equal to 2.

In a possible implementation manner of the first aspect, the first sending time information is an offset of the first time domain reference position relative to the time domain position of the second communication device sending the first message, and the fourth The reception time information is the offset of the first time-domain reference position relative to the time-domain position of the fourth message received by the second communication device.

In a possible implementation manner of the first aspect, the first reception time information is an offset of the second time-domain reference position relative to the time-domain position at which the first communication device receives the first message, and the first Four transmission time information is the offset of the second time domain reference position relative to the time domain position of the first communication device sending the fourth message.

Where A is the first time offset, t′ _{1 is} the offset of the second time domain reference position relative to the time domain position of the first communication device receiving the first message, and t _{1 is} the first time offset An offset of a time-domain reference position relative to the time-domain position at which the second communication device sends the first message, t′ _{4 is} the first time-domain reference location relative to the second communication device at which the fourth message is received The offset of the time domain position of t, t _{4 is} the offset of the second time domain reference position relative to the time domain position of the first communication device sending the fourth message, K is less than 2, or greater than 2, or Real number equal to 2.

In an embodiment of the present application, on the one hand, the first communication device can use the first transmission time information, the first reception time information, the fourth transmission time information, and the fourth reception time information to offset the first time The time offset between the domain reference position and the second time domain reference position, so as to accurately calculate the first time offset. On the other hand, the first communication device may define the second time domain reference position, the second communication device may define the first time domain reference position, the first time domain reference position and the second time domain reference position The definition becomes more flexible.

In a possible implementation manner of the first aspect, the method further includes: the first communication device according to the first transmission time information, the first reception time information, the fourth transmission time information, and the fourth reception time Information to obtain a first reference offset, where the first reference offset is the time offset between the first reference and the second reference, the first reference is the reference of the second communication device, and the second reference is the Reference of the first communication device.

In the embodiment of the present application, the first communication device may also obtain the first communication device's information by using the first transmission time information, the first reception time information, the fourth transmission time information, and the fourth reception time information. The time offset between the first reference and the second reference of the second communication device. For example, it is convenient for the first communication device to align the first reference with the second reference; for another example, after aligning the first reference with the second reference, the amount used to obtain the first time offset can be reduced Signaling.

Where B is the first reference offset, T′ _{1 is} the moment when the first communication device receives the first message, T _{1 is} the moment when the second communication device sends the first message, and T′ ₄ is The moment when the second communication device receives the fourth message, T _{4 is} the moment when the first communication device sends the fourth message, and K is a real number less than 2, or greater than 2, or equal to 2.

In the embodiment of the present application, the first communication device acquires the first reference offset according to the first transmission time information, the first reception time information, the fourth transmission time information, and the fourth reception time information, The synchronization error caused by the inconsistency between the reference of the first communication device and the reference of the second communication device can be offset, and the acquired first time offset is more accurate. For example, it is convenient for the first communication device to align the first reference with the second reference; for another example, after aligning the first reference with the second reference, the amount used to obtain the first time offset can be reduced Signaling.

Where B is the first reference offset, t′ _{1 is} the offset of the second time-domain reference position relative to the time-domain position of the first communication device receiving the first message, and t _{1 is} the first An offset of a time-domain reference position relative to the time-domain position at which the second communication device sends the first message, t′ _{4 is} the first time-domain reference location relative to the second communication device at which the fourth message is received The offset of the time domain position of t, t _{4 is} the offset of the second time domain reference position relative to the time domain position of the first communication device sending the fourth message, K is less than 2, or greater than 2, or Real number equal to 2.

In an embodiment of the present application, on the one hand, the first communication device uses the first transmission time information, the first reception time information, the fourth transmission time information, and the fourth reception time information to calculate the first reference The offset can offset the time offset between the first time domain reference position and the second time domain reference position, thereby accurately calculating the first time offset. On the other hand, the first communication device may define the second time domain reference position, the second communication device may define the first time domain reference position, the first time domain reference position and the second time domain reference position The definition becomes more flexible.

In a possible implementation manner of the first aspect, before the first communication device sends the fourth message, the method further includes: the first communication device receives the fourth resource message sent by the second communication device, the first Four resource messages are used to indicate the resources used by the first communication device to send the fourth message, and the resources of the fourth message include at least one of time domain resources, frequency domain resources, and code domain resources; the first communication device Sending the fourth message includes the first communication device sending the fourth message according to the fourth resource message.

In the embodiment of the present application, the first communication device sends the fourth message according to resources designated by the second communication device, and the second communication device may determine an appropriate time to receive the fourth message. Therefore, this can reduce the energy consumption for the second communication device to wait for receiving the fourth message.

In a possible implementation manner of the first aspect, the method further includes: the first communication device sends a fifth message to the second communication device, where the fifth message carries information indicating the first time offset .

In an embodiment of the present application, on the one hand, the first communication device sends the first time offset to the second communication device, which can weaken the impact of transmission delay on message transmission and improve the first communication device and the second The accuracy of synchronization between communication devices. For example, the second communication device may send a message in advance according to the first time offset, and the message may arrive at the first communication device at a desired time. On the other hand, the signaling used for the second communication device to acquire the first time offset can be reduced.

In a possible implementation manner of the first aspect, the method further includes: the first communication device receives the cell ID sent by the second communication device, and obtains a correspondence between the first time offset and the cell ID.

In the embodiment of the present application, the first communication device can count the time offset of each cell, which is beneficial to achieve multi-cell, high-precision synchronization. On the other hand, different cells only synchronize according to the cell closest to them, and there is no need to obtain global synchronization information, which can reduce the overhead of synchronization signaling.

In a possible implementation manner of the first aspect, the first message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a possible implementation manner of the first aspect, the second message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a possible implementation manner of the first aspect, the third message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a possible implementation manner of the first aspect, the fourth message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a second aspect, a synchronization method is provided. The method includes: a second communication device sends a first message.

In the embodiment of the present application, the first communication device receives the first message sent by the second communication device, and obtains the first time offset according to the sending time and the receiving time of the first message, so that the first message can be obtained The transmission delay of the first message from the second communication device to the first communication device can weaken the influence of the transmission delay on message transmission, and improve the synchronization accuracy between the first communication device and the second communication device. For example, the first communication device may send a message in advance according to the first time offset, and the message may arrive at the second communication device before a specified time, or the first communication device and/or the second communication device may The time offset processes or executes the received information instructions to achieve synchronization under synchronization.

In a possible implementation manner of the second aspect, the method further includes: the second communication device sends first transmission time information, where the first transmission time information is used to instruct the second communication device to send the first message time.

In the embodiment of the present application, the second communication device sends the first transmission time information, which is convenient for the first communication device to obtain the first transmission time information, and reduces the first communication device's acquisition of the first time offset the complexity.

In a possible implementation manner of the second aspect, the first message carries the first sending time information.

In a possible implementation manner of the second aspect, the method further includes: the second communication device sends a first time message, where the first time message carries the first sending time information.

In a possible implementation manner of the second aspect, before the second communication device sends the first message, the method further includes: the second communication device receives the second time message sent by the first communication device, the first The two-time message is used to indicate the first sending time information, and the first sending time information is used to indicate the time when the second communication device sends the first message; the second communication device sends the first message, including: the second communication The device sends the first message according to the first sending time information.

In the embodiment of the present application, the second communication device may send the first message according to the first transmission time information indicated by the second time message, which improves the flexibility of the first communication device to actively determine the first transmission time information Sex.

In a possible implementation manner of the second aspect, before the second communication device sends the first message, the method further includes: the second communication device receives the first resource message sent by the first communication device, the first A resource message is used to indicate the resource used by the second communication device to send the first message. The resource of the first message includes at least one of time domain resource, frequency domain resource, and code domain resource; the second communication device Sending the first message includes the second communication device sending the first message according to the first resource message.

In the embodiment of the present application, the first communication device may specify a resource for the second communication device to send the first message, and the first communication device may determine an appropriate time to receive the first message. Therefore, the energy consumption of the first communication device waiting to receive the first message can be reduced.

In a possible implementation manner of the second aspect, the first sending time information is an offset of the first time domain reference position relative to the time domain position of the second communication device sending the first message; the method further The method includes: the second communication device receives a second message sent by the first communication device; and the second communication device obtains the first time domain reference position.

In the embodiment of the present application, the first communication device sends the second message, so that the second communication device can determine the first time domain reference position, and the first communication device can determine the second time domain reference position. , Combining the first sending time information and the first receiving time information, the time offset between the first time domain reference position and the second time domain reference position can be offset, so that the obtained first time offset is more accurate .

In a possible implementation manner of the second aspect, the first time domain reference position is a time domain position where the second communication device receives the second message.

In the embodiment of the present application, the first communication device determines that the second time domain reference position is the time domain position where the first communication device sends the second message, and the second communication device may determine the first time domain reference position The time domain location for the second communication device to receive the second message. This can avoid sending interactive signaling related to the first time domain reference position and the second time domain reference position.

In a possible implementation manner of the second aspect, the method further includes: the second communication device sends a second reception time, where the second reception time is the first time-domain reference position relative to the second communication device reception The offset to the time domain position of the second message.

In a possible implementation manner of the second aspect, the first message carries information indicating the second reception time.

In a possible implementation manner of the second aspect, the method further includes: the second communication device sends a third time message, where the third time message carries information indicating the second reception time.

In a possible implementation manner of the second aspect, before the second communication device receives the second message sent by the first communication device, the method further includes: the second communication device sends a second resource message, the first The second resource message is used to indicate the resource used by the first communication device to send the second message, and the resource of the second message includes at least one of a time domain resource, a frequency domain resource, and a code domain resource.

In the embodiment of the present application, the second communication device sends the second resource message, the first communication device may send the second message according to the resources specified by the second communication device, and the second communication device may determine a suitable Time to receive the second message. Therefore, the energy consumption of the second communication device waiting to receive the second message can be reduced.

In a possible implementation manner of the second aspect, the first sending time information is an offset of the first time domain reference position relative to the time domain position of the second communication device sending the first message; the method further The method includes: the second communication device receives a third message sent by the first communication device and a third sending time, where the third sending time is when the second time domain reference position is relative to the first communication device sending the third message The offset of the domain position; the second communication device obtains the first time domain reference position according to the time domain position of the third message received by the second communication device and the third transmission time.

In the embodiment of the present application, the second communication device may determine the first time domain reference position based on the second time domain reference position determined by the first communication device, thereby improving the first communication device to determine the second Flexibility of reference position in time domain.

In a possible implementation manner of the second aspect, the third message carries information indicating the third sending time.

In a possible implementation manner of the second aspect, the second communication device receiving the third transmission time includes: the second communication device receives the third transmission time message sent by the first communication device, and the third transmission time message Carrying information indicating the third sending time.

In a possible implementation manner of the second aspect, before the second communication device receives the third message sent by the first communication device, the method further includes: the second communication device sends a third resource message, the first The three resource message is used to indicate a resource used by the first communication device to send the third message, and the resource of the third message includes at least one of a time domain resource, a frequency domain resource, and a code domain resource.

In the embodiment of the present application, the second communication device sends the third resource message, the first communication device may send the third message according to the resource specified by the second communication device, and the second communication device may determine a suitable Time to receive the third message. Therefore, the energy consumption of the second communication device waiting to receive the third message can be reduced.

In a possible implementation manner of the second aspect, the method further includes: the second communication device receives a fourth message sent by the first communication device; the second communication device sends fourth reception time information, the fourth The reception time information is used to indicate the time when the second communication device receives the fourth message.

In the embodiment of the present application, the first message is sent through the first communication device and the second message is received by the second communication device, and the first message is sent through the first communication device and the second message is sent by the second communication device, the first communication The device may acquire the first transmission time information, the first reception time information, the fourth transmission time information, and the fourth reception time information, so as to offset the inconsistency caused by the reference of the first communication device and the reference of the second communication device Synchronization error, the obtained first time offset is more accurate.

In a possible implementation manner of the second aspect, the first message carries the fourth reception time information.

In a possible implementation manner of the second aspect, the second communication device sending the fourth reception time information includes: the second communication device sending a fourth time message, where the fourth time message is used to indicate the fourth reception Time information.

In the embodiment of the present application, the second communication device uses another message to indicate the fourth reception time information, which can increase the flexibility of the first communication device to obtain the fourth reception time information, and can reduce the first message location. The information-carrying payload simplifies the channel design of the first message.

In a possible implementation manner of the second aspect, the first sending time information is an offset of the first time-domain reference position relative to the time-domain position of the second communication device sending the first message; the fourth The reception time information is the offset of the first time-domain reference position relative to the time-domain position of the fourth message received by the second communication device.

In the embodiment of the present application, the first sending time information and the fourth receiving time information are both indication information of time domain position offset, which reduces the complexity of the indication information and is beneficial to the first communication device to receive and process The first transmission time information and the fourth reception time information.

In a possible implementation manner of the second aspect, before the second communication device receives the fourth message sent by the first communication device, the method further includes: the second communication device sends a fourth resource message, the first The four resource messages are used to indicate resources used by the first communication device to send the fourth message. The resources of the fourth message include at least one of time domain resources, frequency domain resources, and code domain resources.

In the embodiment of the present application, the second communication device sends the fourth resource message, the first communication device may send the fourth message according to the resources specified by the second communication device, and the second communication device may determine a suitable Time to receive the fourth message. Therefore, the energy consumption of the second communication device waiting to receive the fourth message can be reduced.

In a possible implementation manner of the second aspect, the method further includes: the second communication device receives a fifth message sent by the first communication device, where the fifth message carries information indicating the first time offset .

In an embodiment of the present application, on the one hand, the second communication device acquiring the first time offset can weaken the impact of transmission delay on message transmission and improve the synchronization accuracy between the first communication device and the second communication device For example, the second communication device may send a message in advance according to the first time offset, and the message may arrive at the first communication device at a desired time. On the other hand, the signaling used for the second communication device to acquire the first time offset can be reduced.

In a possible implementation manner of the second aspect, the method further includes: the second communication device sends a cell ID to the first communication device.

In the embodiment of the present application, the second communication device sends the cell ID to the first communication device, and the first communication device can count the first time offset of each cell, which is beneficial to achieve multi-cell, high precision Synchronization. On the other hand, different cells only synchronize according to the cell closest to them, and there is no need to obtain global synchronization information, which can reduce the overhead of synchronization signaling.

In a possible implementation manner of the second aspect, the first message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a possible implementation manner of the second aspect, the second message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a possible implementation manner of the second aspect, the third message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a possible implementation manner of the second aspect, the fourth message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a third aspect, a synchronization method is provided. The method includes: a first communication device sends a sixth message; the first communication device obtains sixth transmission time information, and the sixth transmission time information is used to indicate the first communication device The time when the sixth message was sent; the first communication device obtains sixth reception time information, and the sixth reception time information is used to indicate the time when the second communication device receives the sixth message; the first communication device according to the The sixth transmission time information and the sixth reception time information acquire the second time offset.

In the embodiment of the present application, the first communication device sends the sixth message, and obtains the second time offset according to the sending time and the receiving time of the sixth message, so that the sixth message can be obtained from the first message The transmission delay from the communication device to the second communication device. In this way, the influence of the transmission delay on message transmission can be weakened, and the synchronization accuracy between the first communication device and the second communication device can be improved. For example, the first communication device may send a message in advance according to the second time offset, and the message may arrive at the second communication device before a specified time, or the first communication device and/or the second communication device may Processes or executes the received information instructions to achieve synchronization under synchronization.

In a possible implementation manner of the third aspect, before the first communication device sends the sixth message, the method further includes: the first communication device receives the fifth time message sent by the second communication device, the first The five-time message is used to indicate the sixth sending time information; the first communication device sends the sixth message, including: the first communication device sends the sixth message according to the sixth sending time information indicated by the fifth time message .

In an embodiment of the present application, on the one hand, the second communication device may determine the sixth transmission time information by itself based on the existing information; on the other hand, the first communication device may send the first transmission time information according to the sixth transmission time information Six messages improve the flexibility of the second communication device to actively determine the sixth sending time information.

In a possible implementation manner of the third aspect, before the first communication device sends the sixth message, the method further includes: the first communication device receives the sixth resource message sent by the second communication device, the first Six resource messages are used to indicate resources used by the first communication device to send the sixth message, and the resources of the sixth message include at least one of time domain resources, frequency domain resources, and code domain resources; the first communication device Sending the sixth message includes the first communication device sending the sixth message according to the sixth resource message.

In the embodiment of the present application, the second communication device may specify a resource for the first communication device to send the sixth message, and the second communication device may determine an appropriate time to receive the sixth message. Therefore, the energy consumption of the second communication device waiting to receive the sixth message can be reduced.

In a possible implementation manner of the third aspect, the method further includes: the first communication device obtains a second reference offset, where the second reference offset is a time offset between the third reference and the fourth reference Volume, the third reference is the reference of the first communication device, and the fourth reference is the reference of the second communication device; the first communication device obtains the first reference according to the sixth transmission time information and the sixth reception time information The second time offset includes: the first communication device acquires the second time offset according to the sixth transmission time information, the sixth reception time information, and the second reference offset.

In the embodiment of the present application, when the third reference is inconsistent with the fourth reference (for example, the clock of the first communication device is inconsistent with the clock of the second communication device), only the sixth transmission time information is used The second time offset obtained from the sixth reception time information is inaccurate. On the one hand, combining the sixth sending time information, the sixth receiving time information, and the second reference offset, the acquired second time offset is more accurate; on the other hand, the third reference and the first When the four references do not change, repeatedly using the second reference offset can reduce the signaling overhead of acquiring the second time offset.

In a possible implementation manner of the third aspect, the sixth received time information is an offset of the fourth time-domain reference position relative to the time-domain position of the sixth message received by the second communication device; Before the first communication device obtains the second time offset according to the sixth transmission time information and the sixth reception time information, the method further includes: the first communication device receives the seventh message sent by the second communication device; The first communication device obtains a third time-domain reference position according to the time-domain position of the seventh message received by the first communication device.

In the embodiment of the present application, the first communication device receives the seventh message sent by the second communication device, so that the first communication device can determine the third time domain reference position, and the second communication device can determine the third message Four time-domain reference positions, in this way, combining the sixth transmission time information and the sixth reception time information, the time offset between the third time-domain reference position and the fourth time-domain reference position can be offset, thereby more accurately Obtain the second time offset.

In a possible implementation manner of the third aspect, the third time domain reference position is the time domain position where the first communication device receives the seventh message.

In the embodiment of the present application, the first communication device determines that the third time domain reference position is the time domain position where the first communication device sends the seventh message, and the second communication device may determine the fourth time domain reference position The time domain location where the second communication device receives the seventh message. In this way, signaling related to the third time domain reference position and the fourth time domain reference position can be avoided, that is, signaling overhead is reduced.

In a possible implementation manner of the third aspect, before the first communication device obtains the third time-domain reference position according to the time-domain position of the seventh message received by the first communication device, the method further includes: The first communication device acquires a seventh transmission time, which is the offset of the fourth time-domain reference position relative to the time-domain position at which the second communication device sends the seventh message; the first communication device Acquiring a third time domain reference position according to the time domain location of the seventh message received by the first communication device, including: the first communication device receiving the seventh message according to the seventh transmission time and the first communication device To obtain the third time-domain reference position.

In the embodiment of the present application, the first communication device may determine the third time domain reference position based on the fourth time domain reference position determined by the second communication device, thereby improving the second communication device's determination of the fourth time domain Reference location flexibility.

In a possible implementation manner of the third aspect, the seventh message carries information indicating the seventh sending time; the obtaining of the seventh sending time by the first communication device includes: the first communication device according to the The information indicating the seventh sending time carried in the seven messages obtains the seventh sending time.

In the embodiment of the present application, the second communication device does not need another message to indicate the seventh transmission time, and the first communication device may directly obtain the seventh transmission time from the seventh message. This can reduce transmission signaling.

In a possible implementation manner of the third aspect, before the first communication device acquires the seventh transmission time, the method further includes: the first communication device receives the sixth time message sent by the second communication device, the The sixth time message carries information indicating the seventh sending time; the first communication device acquiring the seventh sending time includes: the first communication device according to the indication of the seventh sending time carried by the sixth time message Information to obtain the seventh sending time.

In the embodiment of the present application, the second communication device uses another message to indicate the seventh transmission time, which can increase the flexibility of the first communication device to obtain the seventh transmission time, and can reduce the information carried in the seventh message Load, simplify the channel design of the seventh message.

In a possible implementation manner of the third aspect, the first communication device acquiring the seventh transmission time includes: the first communication device determining the resource of the seventh message; the first communication device according to the seventh message Resources, the seventh sending time is obtained, and the resources of the seventh message include at least one of time domain resources, frequency domain resources, and code domain resources.

In the embodiment of the present application, the first communication device may determine the resource of the seventh message by some means (for example, detecting a message resource, etc.), and obtain the seventh sending time information according to the resource of the seventh message. In this way, the second communication device does not need another message to separately send the seventh sending time information, which can reduce transmission signaling. Moreover, since the seventh message does not need to carry additional indication information, the channel design of the seventh message can be simplified, and the detection success rate of detecting the seventh message can be improved.

In a possible implementation manner of the third aspect, the first communication device acquiring the seventh transmission time includes: the first communication device determining the seventh transmission time.

In the embodiment of the present application, on the one hand, the first communication device may determine the seventh transmission time by itself based on the existing information; on the other hand, the second communication device does not need another message to indicate the seventh transmission time, Transmission signaling can be reduced.

In a possible implementation manner of the third aspect, the method further includes: the first communication device sends a seventh time message, and the seventh time message carries information indicating the seventh sending time.

In the embodiment of the present application, the second communication device may send the seventh message according to the seventh transmission time, which improves the flexibility of the first communication device to actively determine the seventh transmission time.

In a possible implementation manner of the third aspect, before the first communication device receives the seventh message sent by the second communication device, the method further includes: the first communication device sends a seventh resource message, the first The seven resource message is used to indicate the resource used by the second communication device to send the seventh message, and the resource of the seventh message includes at least one of time domain resources, frequency domain resources, and code domain resources.

In the embodiment of the present application, the first communication device may specify a resource for the second communication device to send the seventh message, and the first communication device may determine an appropriate time to receive the seventh message. Therefore, the energy consumption of the first communication device waiting to receive the seventh message can be reduced.

In a possible implementation manner of the third aspect, the second time offset meets:

Where C is the second time offset, t′ _{6 is} the offset of the fourth time domain reference position relative to the time domain position where the second communication device received the sixth message, and t _{6 is} the first time offset The offset of the three-time domain reference position relative to the time-domain position at which the first communication device sends the sixth message, K is a real number less than 2, or greater than 2, or equal to 2.

In a possible implementation manner of the third aspect, the method further includes: the first communication device acquiring the second reference offset according to the sixth transmission time information and the sixth reception time information, and the second reference The offset is the time offset between the third time domain reference position and the fourth time domain reference position.

In the embodiment of the present application, the first communication device uses the sixth transmission time information and the sixth reception time information to not only accurately calculate the second time offset, but also obtain the second reference offset . For example, it is convenient to align the third time domain reference position with the fourth time domain reference position; for another example, after aligning the third time domain reference position with the fourth time domain reference position, it can be reduced Two time offset signaling.

In a possible implementation manner of the third aspect, the second reference offset meets:

Where D is the second reference offset, t′ _{6 is} the offset of the fourth time domain reference position relative to the time domain position of the second communication device receiving the sixth message, and t _{6 is} the first reference offset The offset of the three-time domain reference position relative to the time-domain position at which the first communication device sends the sixth message, K is a real number less than 2, or greater than 2, or equal to 2.

In a possible implementation manner of the third aspect, the sixth received time information is an offset of the fourth time-domain reference position relative to the time-domain position of the sixth message received by the second communication device; Before the first communication device obtains the second time offset according to the sixth transmission time information and the sixth reception time information, the method further includes: the first communication device obtains the third time domain reference position; the first The communication device receives the eighth message sent by the second communication device; the first communication device sends an eighth reception time, which is the third time domain reference position relative to the first communication device receiving the eighth The offset of the time domain position of the message.

In the embodiment of the present application, the second communication device may determine the fourth time-domain reference position based on the third time-domain reference position determined by the first communication device, thereby improving the first communication device to determine the third Flexibility of reference position in time domain.

In a possible implementation manner of the third aspect, the sixth message carries information indicating the eighth reception time.

In the embodiment of the present application, the first communication device does not need another message to indicate the eighth transmission time, and the second communication device may directly obtain the third transmission time from the sixth message. This can reduce transmission signaling.

In a possible implementation manner of the third aspect, the first communication device sending the eighth reception time includes: the first communication device sending an eighth time message, where the eighth time message carries an indication of the eighth reception time Information.

In the embodiment of the present application, the first communication device uses another message to indicate the eighth reception time, which can increase the flexibility of the second communication device to obtain the eighth reception time, and can reduce the information carried in the sixth message Load, simplify the channel design of the sixth message.

In a possible implementation manner of the third aspect, before the first communication device receives the eighth message sent by the second communication device, the method further includes: the first communication device sends an eighth resource message, the first The eight resource message is used to indicate the resource used by the second communication device to send the eighth message. The resource of the eighth message includes at least one of time domain resources, frequency domain resources, and code domain resources.

In the embodiment of the present application, the second communication device sends the eighth message according to the resources designated by the first communication device, and the first communication device may determine an appropriate time to receive the eighth message. Therefore, the energy consumption of the first communication device waiting to receive the eighth message can be reduced.

In the embodiment of the present application, the first communication device uses the obtained sixth transmission time information and the sixth reception time information to not only accurately calculate the second time offset, but also obtain the second Reference offset. For example, it is convenient to align the third time domain reference position with the fourth time domain reference position; for another example, after aligning the third time domain reference position with the fourth time domain reference position, it can be reduced Two time offset signaling.

In a possible implementation manner of the third aspect, the method further includes: the first communication device sends a ninth message to the second communication device, where the ninth message carries information indicating the second time offset .

In an embodiment of the present application, on the one hand, the first communication device sends the second time offset to the second communication device, and the second communication device obtains the second time offset, which can weaken the transmission delay Impact on message transmission, improve the synchronization accuracy between the first communication device and the second communication device; for example, the second communication device can send a message in advance according to the second time offset, the message can be at the desired time Arrive at the first communication device. On the other hand, the signaling used for the second communication device to acquire the second time offset can be reduced.

In a possible implementation manner of the third aspect, the method further includes: the first communication device receives the cell ID sent by the second communication device, and obtains a correspondence between the second time offset and the cell ID.

In a possible implementation manner of the third aspect, the sixth message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a possible implementation manner of the third aspect, the seventh message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In the embodiment of the present application, the form of the seventh message may be flexible and diverse.

In a possible implementation manner of the third aspect, the eighth message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In the embodiment of the present application, the form of the eighth message may be flexible and diverse.

According to a fourth aspect, a synchronization method is provided. The method includes: a second communication device receives a sixth message sent by a first communication device; the second communication device sends sixth reception time information, and the sixth reception time information is used for Indicate the time when the second communication device receives the sixth message.

In the embodiment of the present application, the second communication device receives the sixth message sent by the first communication device, and sends the sixth reception time information to the first communication device, and the first communication device may The sending time and receiving time of the six messages to obtain the second time offset, so that the transmission delay of the sixth message from the first communication device to the second communication device can be obtained, which can weaken the transmission delay to the message The influence of transmission improves the synchronization accuracy between the first communication device and the second communication device. For example, the first communication device may send a message in advance according to the second time offset, and the message may arrive at the second communication device before a specified time, or the first communication device and/or the second communication device may obtain Processes or executes the received information instructions to achieve synchronization under synchronization.

In a possible implementation manner of the fourth aspect, before the second communication device receives the sixth message sent by the first communication device, the method further includes: the second communication device sends a fifth time message, the fifth The time message is used to indicate the sixth sending time information.

In the embodiment of the present application, on the one hand, the second communication device may determine the sixth transmission time information by itself based on the existing information; on the other hand, the first communication device may send the Six messages improve the flexibility of the second communication device to actively determine the sixth sending time information.

In a possible implementation manner of the fourth aspect, before the second communication device receives the sixth message sent by the first communication device, the method further includes: the second communication device sends a sixth resource message, the sixth The resource message is used to indicate the resource used by the first communication device to send the sixth message, and the resource of the sixth message includes at least one of time domain resources, frequency domain resources, and code domain resources.

In a possible implementation manner of the fourth aspect, the sixth reception time information is an offset of the fourth time-domain reference position relative to the time-domain position of the sixth message received by the second communication device; the method It also includes: the second communication device sends a seventh message; the second communication device obtains the fourth time domain reference position.

In the embodiment of the present application, the second communication device sends the seventh message, so that the first communication device can determine the third time domain reference position, and the second communication device can determine the fourth time domain reference position. By combining the sixth communication time information and the sixth reception time information with the first communication device, the time offset between the third time domain reference position and the fourth time domain reference position can be offset, thereby obtaining the first time offset The displacement is more precise.

In a possible implementation manner of the fourth aspect, the fourth time-domain reference location is a time-domain location where the second communication device sends the seventh message.

In the embodiment of the present application, the first communication device determines that the third time domain reference position is the time domain position where the first communication device receives the seventh message, and the second communication device may determine the fourth time domain reference The location is the time domain location where the second communication device sends the second message. In this way, it is possible to avoid sending signaling related to the third time domain reference position and the fourth time domain reference position.

In a possible implementation manner of the fourth aspect, the seventh message carries information indicating a seventh sending time, and the seventh sending time is a fourth time-domain reference position relative to the second communication device sending the seventh The offset of the time domain position of the message.

In the embodiment of the present application, the first communication device may determine the third time domain reference position based on the fourth time domain reference position determined by the second communication device, thereby improving the second communication device's determination of the fourth time domain Reference location flexibility. The second communication device does not need another message to indicate the seventh transmission time, and the first communication device can directly obtain the seventh transmission time from the seventh message. This can reduce transmission signaling.

In a possible implementation manner of the fourth aspect, the method further includes: the second communication device sends a sixth time message, where the sixth time message carries information indicating the seventh sending time, and the seventh sending time is The offset of the fourth time domain reference position relative to the time domain position at which the second communication device sends the seventh message.

In the embodiment of the present application, the first communication device may determine the third time domain reference position based on the fourth time domain reference position determined by the second communication device, thereby improving the second communication device's determination of the fourth time domain Reference location flexibility. The second communication device uses another message to indicate the seventh transmission time, which can increase the flexibility of the first communication device to obtain the seventh transmission time, and can reduce the load of information carried in the seventh message, simplifying the seventh message Channel design.

In a possible implementation manner of the fourth aspect, the method further includes: the second communication device receives a seventh time message sent by the first communication device, and the seventh time message carries information indicating the seventh sending time , The seventh sending time is the offset of the fourth time domain reference position relative to the time domain position at which the second communication device sends the seventh message; the second communication device sending the seventh message includes: the second communication The device sends the seventh message according to the seventh time message.

In a possible implementation manner of the fourth aspect, the method further includes: the second communication device receives a seventh resource message sent by the first communication device, and the seventh resource message is used to indicate that the second communication device uses Resources for sending the seventh message, the resources of the seventh message include at least one of time domain resources, frequency domain resources, and code domain resources; the second communication device sending the seventh message includes: the second communication device According to the seventh resource message, the seventh message is sent.

In the embodiment of the present application, the second communication device sends the seventh message according to resources designated by the first communication device, and the first communication device may determine an appropriate time to receive the seventh message. Therefore, the energy consumption for the first communication device to wait to receive the seventh message can be reduced in this way.

In a possible implementation manner of the fourth aspect, the sixth reception time information is an offset of the fourth time-domain reference position relative to the time-domain position of the sixth message received by the second communication device; the method It also includes: the second communication device sends an eighth message; the second communication device receives an eighth reception time sent by the first communication device, the eighth reception time being a third time-domain reference position relative to the first communication device The offset of the time domain position at which the eighth message is received; the second communication device obtains the fourth time domain reference position according to the eighth reception time and the time domain position at which the second communication device sends the eighth message .

In a possible implementation manner of the fourth aspect, the sixth message carries information indicating the eighth reception time.

In the embodiment of the present application, the first communication device does not need another message to indicate the eighth reception time, and the second communication device may directly obtain the eighth reception time from the sixth message. This can reduce transmission signaling.

In a possible implementation manner of the fourth aspect, the second communication device receiving the eighth reception time sent by the first communication device includes: the second communication device receiving the eighth time message sent by the first communication device , The eighth time message carries information indicating the eighth reception time.

In a possible implementation manner of the fourth aspect, before the first communication device sends the eighth message, the method further includes: the first communication device receives the eighth resource message sent by the second communication device, the first The eight resource message is used to indicate the resource used by the first communication device to send the eighth message, and the resource of the eighth message includes at least one of time domain resource, frequency domain resource, and code domain resource; the second communication device Sending the eighth message includes: the second communication device sends the eighth message according to the eighth resource message.

In the embodiment of the present application, the second communication device sends the eighth message according to the resources designated by the first communication device, and the first communication device may determine an appropriate time to receive the eighth message. Therefore, the energy consumption for the first communication device to wait to receive the eighth message can be reduced in this way.

In a possible implementation manner of the fourth aspect, the method further includes: the second communication device receives a ninth message sent by the first communication device, where the ninth message carries information indicating the second time offset .

In an embodiment of the present application, on the one hand, the first communication device sends the second time offset to the second communication device, and the second communication device obtains the second time offset, which can weaken the transmission delay The impact on message transmission improves the synchronization accuracy between the first communication device and the second communication device. For example, the second communication device may send a message in advance according to the second time offset, and the message may arrive at the first communication device at a desired time. Therefore, on the other hand, the signaling used for the second communication device to acquire the second time offset can be reduced.

In a possible implementation manner of the fourth aspect, the method further includes: the second communication device sends a cell ID to the first communication device.

In the embodiment of the present application, the second communication device sends the cell ID to the first communication device, and the first communication device can count the second time offset of each cell, which is beneficial to achieve multi-cell, high precision Synchronization. On the other hand, different cells only synchronize according to the cell closest to them, and there is no need to obtain global synchronization information, which can reduce the overhead of synchronization signaling.

In a possible implementation manner of the fourth aspect, the sixth message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a possible implementation manner of the fourth aspect, the seventh message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a possible implementation manner of the fourth aspect, the eighth message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

According to a fifth aspect, a communication device is provided. The device includes: a receiving module for receiving a first message sent by a second communication device; and a processing module for acquiring first sending time information, the first sending time information is used for To indicate the time when the second communication device sends the first message; the processing module is also used to obtain first reception time information, and the first reception time information is used to indicate the time when the receiving module receives the first message; The processing module is further configured to obtain the first time offset according to the first sending time information and the first receiving time information.

In a possible implementation manner of the fifth aspect, the first message carries the first sending time information; the processing module is specifically configured to obtain the first sending time information carried by the first message.

In a possible implementation manner of the fifth aspect, before the processing module obtains the first sending time information, the receiving module is further configured to receive the first time message sent by the second communication device, the first time message Carrying the first sending time information; the processing module is specifically used to obtain the first sending time information carried by the first time message.

In a possible implementation manner of the fifth aspect, the processing module is specifically configured to determine the resource of the first message; according to the resource of the first message, obtain the first sending time information and the resource of the first message It includes at least one of time domain resources, frequency domain resources, and code domain resources.

In a possible implementation manner of the fifth aspect, the processing module is specifically configured to determine the first sending time information.

In a possible implementation manner of the fifth aspect, the apparatus further includes: a sending module, configured to send a second time message, and the second time message is used to indicate the first sending time information.

In a possible implementation manner of the fifth aspect, before the receiving module receives the first message sent by the second communication device, the apparatus further includes: a sending module, configured to send a first resource message, the first resource message It is used to indicate the resource used by the second communication device to send the first message. The resource of the first message includes at least one of time domain resources, frequency domain resources, and code domain resources.

In a possible implementation manner of the fifth aspect, before the processing module obtains the first time offset according to the first sending time information and the first receiving time information, the processing module is further used to obtain the first A reference offset, the first reference offset is a time offset of the first reference and the second reference, the first reference is a reference of the second communication device, and the second reference is the first The reference of the communication device; the processing module is specifically configured to acquire the first time offset based on the first transmission time information, the first reception time information, and the first reference offset.

In a possible implementation manner of the fifth aspect, the first sending time information is an offset of the first time-domain reference position relative to the time-domain position of the second communication device sending the first message; in the processing Before the module obtains the first time offset according to the first sending time information and the first receiving time information, the device further includes: a sending module for sending a second message; the processing module is also used for sending according to the sending The module sends the time domain position of the second message to obtain the second time domain reference position.

In a possible implementation manner of the fifth aspect, the second time domain reference position is the time domain position where the sending module sends the second message.

In a possible implementation manner of the fifth aspect, before the processing module obtains the second time-domain reference position according to the time-domain position of the second message sent by the sending module, the processing module is further used to obtain the second Two receiving times, the second receiving time is the offset of the first time-domain reference position relative to the time-domain position of the second message received by the second communication device; the processing module is specifically used according to the sending module Acquiring the second time domain reference position by the time domain position of sending the second message and the second receiving time.

In a possible implementation manner of the fifth aspect, the first message carries information indicating the second reception time; obtaining the second reception time by the first communication device includes: the first communication device according to the first The information indicating the second receiving time carried in a message obtains the second receiving time.

In a possible implementation manner of the fifth aspect, the receiving module is further configured to receive a third time message sent by the second communication device, where the third time message carries information indicating the second receiving time; The processing module is specifically configured to obtain the second receiving time according to the information indicating the second receiving time carried in the third time message.

In a possible implementation manner of the fifth aspect, before the sending module sends the second message, the receiving module is further configured to receive a second resource message sent by the second communication device. The second resource message is used Is used to indicate the resource used by the sending module to send the second message, and the resource of the second message includes at least one of time domain resources, frequency domain resources, and code domain resources; the sending module is specifically configured to Resource message, send the second message.

In a possible implementation manner of the fifth aspect, the first time offset meets:

In a possible implementation manner of the fifth aspect, the processing module is further configured to obtain a first reference offset according to the first sending time information and the first receiving time information, and the first reference offset Is the time offset between the first time-domain reference position and the second time-domain reference position.

In a possible implementation manner of the fifth aspect, the first reference offset meets:

In a possible implementation manner of the fifth aspect, the first sending time information is an offset of the first time-domain reference position relative to the time-domain position at which the second communication device sends the first message; the processing module , Which is also used to obtain the second time-domain reference position; before the processing module obtains the first time offset according to the first sending time information and the first receiving time information, the device further includes: a sending module for Sending a third message and a third sending time, where the third sending time is an offset of the second time-domain reference position relative to the time-domain position at which the sending module sends the third message.

In a possible implementation manner of the fifth aspect, the third message carries information indicating the third sending time.

In a possible implementation manner of the fifth aspect, before the processing module obtains the first time offset according to the first sending time information and the first receiving time information, the sending module is further configured to send the first 3. A sending time message, where the third sending time message carries information indicating the third sending time.

In a possible implementation manner of the fifth aspect, before the sending module sends the third message, the receiving module is further configured to receive a third resource message sent by the second communication device, and the third resource message is used to Indicating the resource used by the sending module to send the third message, the resource of the third message includes at least one of a time domain resource, a frequency domain resource, and a code domain resource; the sending module is specifically used for according to the third resource Message, send the third message.

In a possible implementation manner of the fifth aspect, before the processing module obtains the first time offset according to the first sending time information and the first receiving time information, the device further includes a sending module, which is used to: Sending a fourth message; the processing module is also used to obtain fourth sending time information, and the fourth sending time information is used to indicate the time when the sending module sends the fourth message; the processing module is also used to obtain a fourth receiving Time information, the fourth receiving time information is used to indicate the time when the second communication device receives the fourth message; the processing module is specifically used to determine the time according to the first sending time information, the first receiving time information, the first Four sending time information and the fourth receiving time information to obtain the first time offset.

In a possible implementation manner of the fifth aspect, the first message carries the fourth reception time information; the processing module is specifically configured to obtain the fourth reception time information carried by the first message.

In a possible implementation manner of the fifth aspect, the receiving module is further configured to receive a fourth time message sent by the second communication device, and the fourth time message is used to indicate the fourth receiving time information; the processing The module is specifically used to obtain the fourth receiving time information indicated by the fourth time message.

In a possible implementation manner of the fifth aspect, the first sending time information is an offset of the first time domain reference position relative to the time domain position of the second communication device sending the first message; the fourth The reception time information is an offset of the first time-domain reference position relative to the time-domain position of the second communication device receiving the fourth message.

In a possible implementation manner of the fifth aspect, the first received time information is an offset of the second time-domain reference position relative to the time-domain position of the first message received by the receiving module; the fourth transmission The time information is an offset of the second time-domain reference position relative to the time-domain position at which the sending module sends the fourth message.

In a possible implementation manner of the fifth aspect, the processing module is further configured to obtain based on the first sending time information, the first receiving time information, the fourth sending time information, and the fourth receiving time information A first reference offset, the first reference offset is a time offset between the first reference and the second reference, the first reference is a reference of the second communication device, and the second reference is the first communication Equipment reference.

In a possible implementation manner of the fifth aspect, the receiving module is further configured to receive the fourth resource message sent by the second communication device before the sending module sends the fourth message, and the fourth resource message is used to Indicating the resource used by the sending module to send the fourth message, the resource of the fourth message includes at least one of a time domain resource, a frequency domain resource, and a code domain resource; the sending module is specifically used for according to the fourth resource Message, send the fourth message.

In a possible implementation manner of the fifth aspect, the device further includes a sending module, configured to send a fifth message to the second communication device, where the fifth message carries information indicating the first time offset.

In a possible implementation manner of the fifth aspect, the receiving module is further configured to receive the cell ID sent by the second communication device, and the processing module is further configured to acquire the first time offset and the cell ID Correspondence.

In a possible implementation manner of the fifth aspect, the first message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a possible implementation manner of the fifth aspect, the second message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a possible implementation manner of the fifth aspect, the third message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a possible implementation manner of the fifth aspect, the fourth message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

Optionally, the communication device of the fifth aspect may be a terminal device, or may be a component (such as a chip or a circuit) that can be used for the terminal device.

Optionally, the communication apparatus of the fifth aspect may be a network device, or may be a component (such as a chip or a circuit) used in the network device.

According to a sixth aspect, a communication device is provided. The device includes: a sending module configured to send a first message.

In a possible implementation manner of the sixth aspect, the sending module is further configured to send first sending time information, and the first sending time information is used to indicate when the sending module sends the first message.

In a possible implementation manner of the sixth aspect, the first message carries the first sending time information.

In a possible implementation manner of the sixth aspect, the sending module is further configured to send a first time message, where the first time message carries the first sending time information.

In a possible implementation manner of the sixth aspect, the apparatus further includes a receiving module, configured to receive the second time message sent by the first communication device before the sending module sends the first message, the second time message It is used to indicate the first sending time information, and the first sending time information is used to indicate the time when the sending module sends the first message; the sending module is specifically used to send the first message according to the first sending time information.

In a possible implementation manner of the sixth aspect, the apparatus further includes a receiving module, configured to receive the first resource message sent by the first communication device before the sending module sends the first message, the first resource message It is used to indicate the resources used by the sending module to send the first message. The resources of the first message include at least one of time domain resources, frequency domain resources, and code domain resources. The sending module is specifically used for A resource message, sending the first message.

In a possible implementation manner of the sixth aspect, the first sending time information is an offset of the first time-domain reference position relative to the time-domain position at which the sending module sends the first message; the device further includes: The receiving module is used to receive the second message sent by the first communication device; the processing module is used to obtain the first time domain reference position.

In a possible implementation manner of the sixth aspect, the first time domain reference position is the time domain position where the receiving module receives the second message.

In a possible implementation manner of the sixth aspect, the sending module is further configured to send a second receiving time, where the second receiving time is the first time-domain reference position relative to the receiving module receiving the second message The offset of the time domain position of.

In a possible implementation manner of the sixth aspect, the first message carries information indicating the second reception time.

In a possible implementation manner of the sixth aspect, the sending module is further configured to send a third time message, where the third time message carries information indicating the second receiving time.

In a possible implementation manner of the sixth aspect, the sending module is further configured to send a second resource message before the receiving module receives the second message sent by the first communication device, and the second resource message is used to Indicating resources used by the first communication device to send the second message, the resources of the second message including at least one of time domain resources, frequency domain resources, and code domain resources.

In a possible implementation manner of the sixth aspect, the first sending time information is an offset of the first time-domain reference position relative to the time-domain position at which the sending module sends the first message; the device further includes: A receiving module, configured to receive a third message sent by the first communication device and a third sending time, where the third sending time is a time domain position of the second time-domain reference position relative to the first communication device sending the third message A processing module, configured to obtain the first time-domain reference position according to the time-domain position of the third message received by the receiving module and the third sending time.

In a possible implementation manner of the sixth aspect, the third message carries information indicating the third sending time.

In a possible implementation manner of the sixth aspect, the receiving module is specifically configured to receive a third sending time message sent by the first communication device, where the third sending time message carries information indicating the third sending time .

In a possible implementation manner of the sixth aspect, the sending module is further configured to send a third resource message before the receiving module receives the third message sent by the first communication device, and the third resource message is used to Indicating resources used by the first communication device to send the third message, the resources of the third message including at least one of time domain resources, frequency domain resources, and code domain resources.

In a possible implementation manner of the sixth aspect, the apparatus further includes: a receiving module, configured to receive a fourth message sent by the first communication device; the sending module, further configured to send fourth reception time information, the The fourth receiving time information is used to indicate the time when the receiving module receives the fourth message.

In a possible implementation manner of the sixth aspect, the first message carries the fourth reception time information.

In a possible implementation manner of the sixth aspect, the sending module is specifically configured to send a fourth time message, and the fourth time message is used to indicate the fourth receiving time information.

In a possible implementation manner of the sixth aspect, the first sending time information is an offset of the first time-domain reference position relative to the time-domain position at which the sending module sends the first message; the fourth receiving time The information is an offset of the first time-domain reference position relative to the time-domain position of the fourth message received by the receiving module.

In a possible implementation manner of the sixth aspect, the sending module is further configured to send a fourth resource message before the receiving module receives the fourth message sent by the first communication device, and the fourth resource message is used to Indicating resources used by the first communication device to send the fourth message, the resources of the fourth message including at least one of time domain resources, frequency domain resources, and code domain resources.

In a possible implementation manner of the sixth aspect, the apparatus further includes: a receiving module, configured to receive a fifth message sent by the first communication device, the fifth message carrying information indicating the first time offset .

In a possible implementation manner of the sixth aspect, the sending module is further configured to send the cell ID to the first communication device.

In a possible implementation manner of the sixth aspect, the first message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a possible implementation manner of the sixth aspect, the second message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a possible implementation manner of the sixth aspect, the third message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a possible implementation manner of the sixth aspect, the fourth message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

Optionally, the communication apparatus of the sixth aspect may be a terminal device, or may be a component (such as a chip or a circuit) that can be used for the terminal device.

Optionally, the communication apparatus of the sixth aspect may be a network device, or may be a component (such as a chip or a circuit) used in the network device.

In a seventh aspect, a communication device is provided. The device includes: a sending module for sending a sixth message; a processing module for acquiring sixth sending time information, and the sixth sending time information is used to instruct the sending module to send The time of the sixth message; the processing module is also used to obtain sixth reception time information, and the sixth reception time information is used to indicate the time when the second communication device receives the sixth message; the processing module is also used Based on the sixth transmission time information and the sixth reception time information, a second time offset is obtained.

In a possible implementation manner of the seventh aspect, the apparatus module further includes: a receiving module, configured to receive a fifth time message sent by the second communication device before the sending module sends the sixth message, the fifth The time message is used to indicate the sixth sending time information; the sending module is specifically used to send the sixth message according to the sixth sending time information indicated by the fifth time message.

In a possible implementation manner of the seventh aspect, the apparatus module further includes: a receiving module, configured to receive a sixth resource message sent by the second communication device before the sending module sends the sixth message, the sixth The resource message is used to indicate the resource used by the sending module to send the sixth message, and the resource of the sixth message includes at least one of time domain resources, frequency domain resources, and code domain resources; the sending module is specifically used for The sixth resource message sends the sixth message.

In a possible implementation manner of the seventh aspect, the processing module is further configured to acquire a second reference offset, where the second reference offset is a time offset between the third reference and the fourth reference, the The third reference is the reference of the first communication device, and the fourth reference is the reference of the second communication device; the processing module is specifically used for according to the sixth transmission time information, the sixth reception time information, and the second With reference to the offset, the second time offset is obtained.

In a possible implementation manner of the seventh aspect, the sixth reception time information is an offset of the fourth time-domain reference position relative to the time-domain position of the sixth message received by the second communication device; the apparatus It also includes a receiving module for receiving the seventh message sent by the second communication device before the processing module obtains the second time offset based on the sixth sending time information and the sixth receiving time information; The module is further used to obtain a third time-domain reference position according to the time-domain position of the seventh message received by the receiving module.

In a possible implementation manner of the seventh aspect, the third time domain reference position is a time domain position where the receiving module receives the seventh message.

In a possible implementation manner of the seventh aspect, the processing module is further configured to obtain the third time domain reference position before the processing module obtains the third time domain reference position according to the time domain position of the seventh message received by the receiving module Seven sending times, the seventh sending time is the offset of the fourth time domain reference position relative to the time domain position at which the second communication device sends the seventh message; the processing module is specifically configured to be based on the seventh sending time And the time-domain location of the seventh message received by the receiving module, to obtain the third time-domain reference location.

In a possible implementation manner of the seventh aspect, the seventh message carries information indicating the seventh sending time; the processing module is specifically configured to indicate the seventh sending time according to the indication carried by the seventh message To obtain the seventh sending time.

In a possible implementation manner of the seventh aspect, the receiving module is further configured to receive the sixth time message sent by the second communication device before the processing module obtains the seventh sending time, where the sixth time message carries There is information indicating the seventh sending time; the processing module is specifically configured to obtain the seventh sending time according to the information indicating the seventh sending time carried in the sixth time message.

In a possible implementation manner of the seventh aspect, the processing module is specifically configured to determine resources of the seventh message; the processing module obtains the seventh sending time according to the resources of the seventh message, and the seventh message The resources of include at least one of time domain resources, frequency domain resources, and code domain resources.

In a possible implementation manner of the seventh aspect, the processing module is specifically configured to determine the seventh sending time.

In a possible implementation manner of the seventh aspect, the sending module is further configured to send a seventh time message, where the seventh time message carries information indicating the seventh sending time.

In a possible implementation manner of the seventh aspect, the sending module is further configured to send a seventh resource message before the receiving module receives the seventh message sent by the second communication device, and the seventh resource message is used to Indicating resources used by the second communication device to send the seventh message, the resources of the seventh message including at least one of time domain resources, frequency domain resources, and code domain resources.

In a possible implementation manner of the seventh aspect, the second time offset meets:

In a possible implementation manner of the seventh aspect, the processing module is further configured to obtain a second reference offset according to the sixth transmission time information and the sixth reception time information, and the second reference offset Is the time offset between the third time domain reference position and the fourth time domain reference position.

In a possible implementation manner of the seventh aspect, the second reference offset meets:

In a possible implementation manner of the seventh aspect, the sixth reception time information is an offset of the fourth time-domain reference position relative to the time-domain position of the sixth message received by the second communication device; Before the processing module obtains the second time offset according to the sixth sending time information and the sixth receiving time information, the processing module is further used to obtain the third time domain reference position; the device further includes: a receiving module, It is used to receive the eighth message sent by the second communication device; the sending module is also used to send an eighth receiving time, which is the third time domain reference position relative to the receiving module receiving the eighth The offset of the time domain position of the message.

In a possible implementation manner of the seventh aspect, the sixth message carries information indicating the eighth reception time.

In a possible implementation manner of the seventh aspect, the sending module is specifically configured to send an eighth time message, where the eighth time message carries information indicating the eighth receiving time.

In a possible implementation manner of the seventh aspect, the sending module is further configured to send an eighth resource message before the receiving module receives the eighth message sent by the second communication device, and the eighth resource message is used to Indicating resources used by the second communication device to send the eighth message, where resources of the eighth message include at least one of time domain resources, frequency domain resources, and code domain resources.

Where D is the second reference offset, t′ _{6 is} the offset of the fourth time-domain reference position relative to the time-domain position of the second communication device receiving the sixth message, and t _{6 is} the first The offset of the three-time domain reference position relative to the time-domain position at which the first communication device sends the sixth message, K is a real number less than 2, or greater than 2, or equal to 2.

In a possible implementation manner of the seventh aspect, the sending module is further configured to send a ninth message to the second communication device, where the ninth message carries information indicating the second time offset.

In a possible implementation manner of the seventh aspect, the apparatus further includes: a receiving module, configured to receive a cell ID sent by the second communication device, and obtain a correspondence between the second time offset and the cell ID.

In a possible implementation manner of the seventh aspect, the sixth message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a possible implementation manner of the seventh aspect, the seventh message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a possible implementation manner of the seventh aspect, the eighth message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

Optionally, the communication apparatus of the seventh aspect may be a terminal device, or may be a component (such as a chip or a circuit) that can be used for the terminal device.

Optionally, the communication device of the seventh aspect may be a network device, or may be a component (such as a chip or a circuit) used in the network device.

In an eighth aspect, a communication device is provided. The device includes: a receiving module for receiving a sixth message sent by a first communication device; a sending module for sending sixth receiving time information, the sixth receiving time information is used for To indicate the time when the receiving module receives the sixth message.

In a possible implementation manner of the eighth aspect, the sending module is further configured to send a fifth time message before the receiving module receives the sixth message sent by the first communication device, where the fifth time message is used to indicate The sixth transmission time information.

In a possible implementation manner of the eighth aspect, the sending module is further configured to send a sixth resource message before the receiving module receives the sixth message sent by the first communication device, where the sixth resource message is used to indicate The first communication device is used to send resources of the sixth message, and the resources of the sixth message include at least one of time domain resources, frequency domain resources, and code domain resources.

In a possible implementation manner of the eighth aspect, the sixth reception time information is an offset of the fourth time-domain reference position relative to the time-domain position of the sixth message received by the receiving module; the sending module, It is also used to send the seventh message; the device further includes: a processing module, configured to obtain the fourth time-domain reference position.

In a possible implementation manner of the eighth aspect, the fourth time domain reference position is the time domain position where the sending module sends the seventh message.

In a possible implementation manner of the eighth aspect, the seventh message carries information indicating the seventh sending time, and the seventh sending time is the fourth time domain reference position relative to the sending module sending the seventh message The offset of the time domain position.

In a possible implementation manner of the eighth aspect, the sending module is further configured to send a sixth time message, where the sixth time message carries information indicating the seventh sending time, and the seventh sending time is the fourth time The offset of the domain reference position relative to the time domain position at which the sending module sends the seventh message.

In a possible implementation manner of the eighth aspect, the receiving module is further configured to receive a seventh time message sent by the first communication device, where the seventh time message carries information indicating the seventh sending time, the The seventh sending time is an offset of the fourth time-domain reference position relative to the time-domain position at which the sending module sends the seventh message; the sending module is specifically configured to send the seventh message according to the seventh time message.

In a possible implementation manner of the eighth aspect, the receiving module is further configured to receive a seventh resource message sent by the first communication device, where the seventh resource message is used to indicate that the sending module is used to send the seventh The resources of the message, the resources of the seventh message include at least one of time domain resources, frequency domain resources, and code domain resources; the sending module is specifically configured to send the seventh message according to the seventh resource message.

In a possible implementation manner of the eighth aspect, the sixth reception time information is an offset of the fourth time-domain reference position relative to the time-domain position of the sixth message received by the receiving module; the sending module, Also used to send an eighth message; the receiving module is also used to receive an eighth receiving time sent by the first communication device, the eighth receiving time being a third time-domain reference position relative to the first communication device receiving the The offset of the time domain position of the eighth message; the device further includes: a processing module configured to obtain the fourth time domain reference position according to the eighth reception time and the time domain position of the eighth message sent by the sending module .

In a possible implementation manner of the eighth aspect, the sixth message carries information indicating the eighth reception time.

In a possible implementation manner of the eighth aspect, the receiving module is specifically configured to receive an eighth time message sent by the first communication device, where the eighth time message carries information indicating the eighth receiving time.

In a possible implementation manner of the eighth aspect, before the sending module sends the eighth message, the receiving module is further configured to receive an eighth resource message sent by the sending module, and the eighth resource message is used to indicate the The resource used by the first communication device to send the eighth message, the resource of the eighth message includes at least one of time domain resources, frequency domain resources, and code domain resources; the sending module is specifically configured to use the eighth resource Message, send the eighth message.

In a possible implementation manner of the eighth aspect, the receiving module is further configured to receive a ninth message sent by the first communication device, where the ninth message carries information indicating the second time offset.

In a possible implementation manner of the eighth aspect, the sending module is specifically configured to send the cell ID to the first communication device.

In a possible implementation manner of the eighth aspect, the sixth message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a possible implementation manner of the eighth aspect, the seventh message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

In a possible implementation manner of the eighth aspect, the eighth message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal.

Optionally, the communication apparatus of the eighth aspect may be a terminal device, or may be a component (such as a chip or a circuit) that can be used for the terminal device.

Optionally, the communication apparatus of the eighth aspect may be a network device, or may be a component (such as a chip or a circuit) used in the network device.

In a ninth aspect, an embodiment of the present application provides a storage medium that stores instructions for implementing the method described in the first aspect to the fourth aspect or any possible implementation manner of the first aspect to the fourth aspect .

According to a tenth aspect, the present application provides a computer program product containing instructions that, when the computer program product runs on a computer, causes the computer to perform any one of the first aspect to the fourth aspect or the first aspect to the fourth aspect In a possible implementation manner.

In an eleventh aspect, the present application provides a communication device, configured to execute the method described in the first aspect to the fourth aspect or any possible implementation manner of the first aspect to the fourth aspect.

In a twelfth aspect, the present application provides a communication device. The device includes: a processor and a memory, the processor is coupled to the memory, the memory is used to store a computer program, and the processor is used to execute the memory A computer program stored in the computer, so that the communication device executes the method described in the first aspect to the fourth aspect or any possible implementation manner of the first aspect to the fourth aspect.

In a thirteenth aspect, the present application provides a communication device, the device includes: a processor, a memory, and a transceiver, the memory is used to store a computer program, and the processor is used to execute storage in the memory A computer program, so that the apparatus executes the method described in the first aspect to the fourth aspect or any possible implementation manner of the first aspect to the fourth aspect.

In a fourteenth aspect, the present application provides a processor, the processor including: at least one circuit configured to execute any one of the foregoing first aspect to fourth aspect or any one of the first aspect to the fourth aspect Implementation method described.

In a fifteenth aspect, the present application provides a communication system including the first communication device and the second communication device above.

BRIEF DESCRIPTION

FIG. 1 is a schematic diagram of a communication scenario according to an embodiment of the present application.

2 is a schematic diagram of a message transmission delay.

FIG. 3 is a schematic flowchart of a synchronization method according to an embodiment of the present application.

4 is a schematic diagram of an embodiment of a synchronization method according to an embodiment of the present application.

FIG. 5 is a schematic flowchart of a synchronization method according to an embodiment of the present application.

6 is a schematic diagram of an embodiment of a synchronization method according to an embodiment of the present application.

7 is a schematic flowchart of a synchronization method according to an embodiment of the present application.

8 is a schematic diagram of an embodiment of a synchronization method according to an embodiment of the present application.

9 is a schematic diagram of an embodiment of a synchronization method according to an embodiment of the present application.

10 is a schematic diagram of an embodiment of a synchronization method according to an embodiment of the present application.

FIG. 11 is a schematic diagram of an embodiment of a synchronization method according to an embodiment of the present application.

12 is a schematic flowchart of a synchronization method according to an embodiment of the present application.

13 is a schematic diagram of an embodiment of a synchronization method according to an embodiment of the present application.

14 is a schematic diagram of an embodiment of a synchronization method according to an embodiment of the present application.

15 is a schematic flowchart of a synchronization method according to an embodiment of the present application.

16 is a schematic diagram of an embodiment of a synchronization method according to an embodiment of the present application.

17 is a schematic diagram of an embodiment of a synchronization method according to an embodiment of the present application.

18 is a schematic flowchart of a synchronization method according to an embodiment of the present application.

FIG. 19 is a schematic diagram of an embodiment of a synchronization method according to an embodiment of the present application.

20 is a schematic flowchart of a synchronization method according to an embodiment of the present application.

21 is a schematic diagram of an embodiment of a synchronization method according to an embodiment of the present application.

22 is a schematic flowchart of a synchronization method according to an embodiment of the present application.

23 is a schematic diagram of an embodiment of a synchronization method according to an embodiment of the present application.

24 is a schematic diagram of an embodiment of a synchronization method according to an embodiment of the present application.

FIG. 25 is a schematic diagram of an embodiment of a synchronization method according to an embodiment of the present application.

FIG. 26 is a schematic diagram of an embodiment of a synchronization method according to an embodiment of the present application.

FIG. 27 is a schematic flowchart of a synchronization method according to an embodiment of the present application.

FIG. 28 is a schematic diagram of an embodiment of a synchronization method according to an embodiment of the present application.

FIG. 29 is a schematic diagram of an embodiment of a synchronization method according to an embodiment of the present application.

30 is a schematic structural diagram of a communication device according to an embodiment of the present application.

FIG. 31 is a schematic structural diagram of a communication device according to an embodiment of the present application.

32 is a schematic structural diagram of a communication device according to an embodiment of the present application.

33 is a schematic structural diagram of a communication device according to an embodiment of the present application.

34 is a schematic structural diagram of a communication device according to an embodiment of the present application.

35 is a schematic structural diagram of a communication device according to an embodiment of the present application.

detailed description

The technical solutions in this application will be described below with reference to the drawings.

In this application, "at least one" refers to one or more, and "multiple" refers to two or more. "And/or" describes the relationship of the related objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A exists alone, A and B exist at the same time, B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the related object is a "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, at least one (a) of a, b, or c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c may be single or multiple. In addition, in the embodiments of the present application, the words "first", "second", "1", "2", etc. do not limit the number and execution order.

It should be noted that, in this application, the words "exemplary" or "for example" are used as examples, illustrations or explanations. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being more preferred or advantageous than other embodiments or design. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner. In this application, one or more embodiments may be implemented separately or together, which is not limited in this application.

The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: global mobile communication (global system for mobile communications, GSM) system, code division multiple access (code division multiple access (CDMA) system, broadband code division multiple access) (wideband code division multiple access (WCDMA) system, general packet radio service (general packet radio service, GPRS), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE Time division duplex (time division duplex, TDD), universal mobile communication system (universal mobile telecommunication system, UMTS), global interconnection microwave access (worldwide interoperability for microwave access, WiMAX) communication system, future fifth generation (5th generation, 5G) system new radio (NR), unlicensed spectrum wireless communication system, wireless fidelity (WiFi) system, or unlicensed new radio (NR-U) under unlicensed spectrum, etc.

To facilitate understanding of the embodiments of the present application, first, a communication system suitable for the method provided by the embodiments of the present application will be described in detail with reference to FIG. 1. FIG. 1 shows a schematic diagram of a communication system 100 suitable for the method provided by the embodiments of the present application. As shown in FIG. 1, the communication system 100 may include at least two network devices, such as base stations (gNB) 1 and gNB 2 in the 5G system shown in FIG. 1. The communication system 100 may also include at least one terminal device. As shown in FIG. 1, user equipment (user equipment, UE) 1 to UE 4. The network device and the terminal device in the communication system 100 can communicate through a wireless link. For example, the network device may send configuration information to the terminal device. The terminal device may send uplink data to the network device based on the configuration information; for another example, the network device may send downlink data to the terminal device. Therefore, gNB1, gNB2, UE1 to UE4 in Fig. 1 can constitute a communication system. The terminal device in the communication system 100 may also communicate with another terminal device, such as device-to-device (D2D) or machine-to-machine (M2M) scenarios. For example, UE1 can control UE2 to execute corresponding instructions. Therefore, UE1 and UE2 in FIG. 1 may also constitute a communication system. The network device in the communication system 100 can also communicate with another network device, such as communication between a macro base station and an access point. Therefore, gNB1 and gNB2 in Figure 1 can also constitute a communication system.

It should be understood that the network device in the communication system may be any device with wireless transceiver function. The network equipment includes but is not limited to: evolved Node B (evolved Node B, eNB), radio network controller (radio network controller, RNC), node B (Node B, NB), base station controller (base station controller, BSC) ), base transceiver station (BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (BBU), wireless fidelity (WiFi) system Access point (AP), wireless relay node, wireless backhaul node, transmission point (transmission point, TP) or sending and receiving point (transmission and reception point, TRP), etc., can also be used for satellite to ground communication The satellite in the network can also be 5G, such as NR, gNB in the system, or transmission point (TRP or TP), one or a group of base stations in the 5G system (including multiple antenna panels), or, It can also be a network node that constitutes a gNB or a transmission point, such as a baseband unit (BBU), or a distributed unit (DU).

It should also be understood that the terminal equipment in the wireless communication system may also be referred to as user equipment (UE), access terminal, subscriber unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, User terminal, terminal, wireless communication device, user agent or user device. The terminal device in the embodiment of the present application may be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (virtual reality, VR) terminal device, and an augmented reality (augmented reality, AR) terminal Equipment, ground communication equipment in satellite-to-ground communications, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical, and smart grids (smart) wireless terminal in grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, and wireless terminal in smart factory Or manufacturing equipment. The embodiments of the present application do not limit application scenarios.

It should also be understood that FIG. 1 is only a simplified schematic diagram for ease of understanding and examples. The communication system 100 may also include other network devices or other terminal devices, which are not shown in FIG. 1.

The communication device mentioned in the embodiments of the present application may be a terminal device or a network device. For example, both the first communication device and the second communication device may be network devices. For another example, both the first communication device and the second communication device may be terminal devices. For another example, the first communication device may be a terminal device, and the second communication device may be a network device. For another example, the first communication device may be a network device, and the second communication device may be a terminal device.

The manner in which the communication device sends messages in the embodiments of the present application may be a way of broadcasting messages, a way of sending messages unicast, or a way of sending messages by multicast. For example, the manner in which the first communication device sends the message 1 may be that the first communication device broadcasts the message 1, or the first communication device multicasts the message 1 to a group of communication devices. For another example, the manner in which the first communication device sends message 2 may be that the first communication device unicasts the message 2 to the second communication device, or the first communication device multicasts the message 2 to a group of communication devices. For another example, the manner in which the second communication device sends the message 3 may be that the second communication device broadcasts the message 3, or that the second communication device multicasts the message 3 to a group of communication devices. For another example, the manner in which the second communication device sends the message 4 may be that the second communication device unicasts the message 4 directly to the first communication device, or the second communication device multicasts the message to a group of communication devices 4.

For ease of description, the term "time" in this application may include any possible concept in the sense of time, such as "time", "time period", "clock", etc. Among them, "time" refers to a time point such as 10:0 minutes and 0 seconds, "time period" refers to a period of time such as 1s, and "clock" refers to a reference used by the device to record time.

For ease of description, the term "time domain position" in this application may be any position on a certain time unit, where the time unit may be a time slot, subframe, radio frame, mini-slot, OFDM symbols, etc., may also be other time units, which is not limited in this application. For example, it may be the starting boundary of the fifth radio frame, or may be the ending boundary of the fifth radio frame, or may be any position within the fifth radio frame.

For ease of description, the term “acquisition” in this application may be any form of concept obtained, for example, “the device does not need to be determined based on additional signaling or signals”, or “determined based on received signaling or signals” , Can also be "after processing" and so on.

The promotion of vertical services (for example, machine-to-machine communication in a smart factory scenario, car-to-car communication in a connected car scenario, etc.) makes the synchronization accuracy requirements of different network devices more stringent, for example, the synchronization between different communication devices The error is less than 1 microsecond (μs). In the case where there is a wired connection between different network devices, a higher synchronization accuracy can be achieved to meet the service requirements for synchronization accuracy. However, if there is no wired connection between different network devices and between different communication devices, the synchronization error is, for example, 10 ms. At this time, there is no wired network device and the communication device connected to the network device has low synchronization accuracy. Even if the terminal device associated with the network device can maintain a high synchronization accuracy with the network device, it can communicate with different network devices. The associated terminal equipment cannot maintain a high synchronization accuracy, and cannot meet the service requirements for synchronization accuracy.

The network device can send system information (system information block, SIB) to other communication devices. The SIB carries the indication information of the wireless frame boundary, which is used to indicate the wireless frame boundary of the current system frame number (system frame number, SFN) Time offset from 0:0:0 on January 1, 1900. The minimum unit of this time offset is 10 ms. Therefore, it is difficult to achieve high synchronization accuracy using SIB.

The network device may also send a synchronization signal and physical broadcast channel block (SS/PBCH Block) to other communication devices. The SS/PBCH Block carries wireless frame information, where the wireless frame is a 10 ms granularity time unit, such as Figure 2 shows. gNB 1 sends an SS/PBCH Block to gNB 2 at time t ₁ ; gNB 2 receives the SS/PBCH Block at time t ₂ , so that gNB 2 can obtain the information of the wireless frame of gNB 1 according to the received SS/PBCH block. The information of the frame includes the time-domain boundary information of the wireless frame and the frame number information of the wireless frame; in turn, gNB2 can maintain synchronization with gNB1 within a granularity of 10 ms. However, due to the transmission delay of the SS/PBCH Block during the transmission process, there must be an offset in the time domain between time t _{1 and} time t ₂ , which makes it impossible to achieve a high level of communication between network device communication devices Synchronization accuracy.

301. The second communication device sends the first message. Correspondingly, the first communication device receives the first message sent by the second communication device.

Optionally, the second communication device may periodically send the first message. For example, the second communication device sends the first message every 1 ms, or sends the first message every 20 ms.

Optionally, the second communication device may trigger sending the first message according to the configuration. Taking the configuration of triggering sending the first message as an example, one way is that the second communication device can trigger the second communication device to send the first message according to whether a trigger signal of another communication device is received; another way Yes, the second communication device may trigger the second communication device to periodically send the first message according to whether a trigger signal of another communication device is received, for example, the second communication device may use a pre-configured The first message is sent every 2 radio frames, or every 20 ms. Optionally, the triggered periodic transmission may end the periodic transmission according to the configuration, or a trigger signal, or a predefined parameter. For example, after the second communication device sends the first message every 20 ms period, it receives Trigger signal sent periodically; the second communication device ends sending the first message; or, the second communication device sends the first message every 20ms within 80ms, and the second communication device stops sending the first message after 80ms news. The triggering sending according to the configuration further includes that the first communication device measures the signal sent by the second communication device to obtain synchronization error information; if the synchronization error exceeds a given threshold, the first communication device triggers sending the first message.

Optionally, the first message may be an uplink trigger signal (such as a random access preamble Preamble, a signal carrying Msg.1), SS/PBCH block, primary synchronization signal, secondary synchronization signal, and channel demodulation reference signal (demodulation At least one of reference (signal, DMRS) and channel quality measurement reference symbol (channel-state information-reference signal (CSI-RS).

Optionally, the manner in which the first communication device receives the first message may be that the first communication device detects the resource that the second communication device sends the first message. The resources that the second communication device sends the first message may include at least one of time domain resources, frequency domain resources, and code domain resources. For example, the first communication device detects the first message on time unit 1, where the time unit may be a time slot, subframe, mini-slot, or OFDM symbol. For another example, the first communication device detects the first message on frequency band 1. For another example, the first communication device generates a sequence 1 of the first message, and detects the first message according to the generated sequence 1. This embodiment of the present application is not limited thereto.

Optionally, the first communication device sends a first resource message, and the first resource message is used to indicate a resource used by the second communication device to send the first message, and the resource of the first message includes a time domain resource and a frequency domain At least one of resources and code domain resources. Correspondingly, the second communication device receives the first resource message sent by the first communication device, and the second communication device sends the first message, including: the second communication device sends the first resource message according to the first resource message news. In other words, the first communication device may indicate the resource used by the second communication device to send the first message, and the second communication device sends the first message on the resource indicated by the first communication device. Taking time-frequency resources as an example, the first communication device sends a first resource message 1, and the first resource message 1 indicates a time-domain and/or frequency-domain resource used by the second communication device to send the first message, for example: {Time unit 1, band range 1}, or {time unit 2, band range 2}; further, the second communication device according to the first resource message 1, time unit 1, band range in the indicated resource 1 to send the first message. For another example, the first communication device sends a first resource message 2, which indicates the time domain position of the OFDM symbol in the time slot occupied by the second communication device, such as the time domain of the OFDM symbol where the message is received The location, or, the time-domain location of the OFDM symbol where the message is sent, or not limited to the time-domain location of the OFDM symbol received or transmitted.

302. The first communication device obtains first sending time information, where the first sending time information is used to indicate the time when the second communication device sends the first message.

Optionally, the first communication device may obtain the first sending time information according to the instruction of the second communication device. For example, the first communication device may receive a message sent by the second communication device, where the message carries the first transmission time information, and the first communication device may obtain the first transmission time information from the message.

Optionally, the first message carries the first sending time information; obtaining the first sending time information by the first communication device includes: the first communication device acquiring all the information carried by the first message The first transmission time information is described. For example, the first communication device parses the first message to obtain the first sending time information. It is understandable that the "analysis" mentioned in this application includes but is not limited to at least one of coherent/non-coherent detection (coherent/non-coherent detection), descrambling, decoding (decoding), demodulation, or CRC detection. Species.

Optionally, before the first communication device obtains the first transmission time information, the method further includes: the first communication device receives a first time message sent by the second communication device, the first time The message carries the first sending time information; the first communication device acquiring the first sending time information includes: the first communication device acquiring the first sending time information carried by the first time message. For example, the first communication device parses the first time message to obtain the first sending time information.

Optionally, the first communication device may not receive instructions from other devices and determine the first sending time information. For example, the first transmission time information is predefined or the first communication device is configured to the second communication device, and the first communication device can determine the first transmission time information without acquiring indication information of other devices.

Optionally, the first communication device acquiring the first sending time information includes: the first communication device determining the resource of the first message; the first communication device acquiring according to the resource of the first message In the first sending time information, the resources of the first message include at least one of time domain resources, frequency domain resources, and code domain resources. In other words, the first communication device may detect the resources of the first message, and determine the first transmission time information according to the relationship between the resources of the first message and the first transmission time information. Taking time-frequency resources as an example, the first communication device may pre-configure first transmission time information 1 corresponding to time-frequency resource 1 and first transmission time information 2 corresponding to time-frequency resource 2, if the first communication device is in When the first message is detected on the time-frequency resource 1, the first sending time information is the first sending time information 1.

Optionally, the first communication device may determine the first sending time information according to the pre-configuration information. For example, the first message is pre-configured to be sent in a given time slot within an even-numbered wireless frame, and the first communication device can obtain the first transmission time information without receiving instructions from other devices.

Optionally, the first communication device sends a second time message, where the second time message is used to indicate the first sending time information. The second communication device receives the second time message sent by the first communication device; the second communication device sends the first message, including: the second communication device sends the first message according to the first transmission time information. In other words, the second communication device may send the first message according to the transmission time indicated by the first communication device. For example, the first communication device may specify the second communication device to send the first message in a given time slot within an even radio frame through the first message, or the second communication device may send the For the first message, the first communication device may send the first message in a given time slot within an even radio frame according to the indication of the first message, or send the first message at 10:00 am and 0 seconds.

Optionally, the first sending time information may be information indicating the time when the second communication device sends the first message.

In an example, the first sending time information may be the sending time of the first message, that is, the time when the second communication device sends the first message, for example, 10 hours, 0 minutes, and 0 seconds.

In an example, the first sending time information may be a relative sending time period of the first message, that is, a time when the second communication device sends the first message is relative to a reference time period, for example, 1 ms.

In one example, the first sending time information may be time domain location information of the first message. For example, the second to fifth OFDM symbols of the first time slot in an even-numbered radio frame, or the first transmission time information may be the number of the radio frame of the resource where the first message is located.

In an example, the first sending time information may be an offset of the time domain position of the resource where the first message is located relative to the time domain reference position, for example, 10 radio frame intervals after the fifth radio frame .

In one example, the first sending time information may be information related to time domain position information of the first message, for example, frequency domain position information, code domain position information of the first message, and so on.

303. The first communication device acquires first reception time information, where the first reception time information is used to indicate the time when the first communication device receives the first message.

Optionally, the first reception time information may be information indicating the time when the first communication device receives the first message.

In an example, the first reception time information may be the reception time of the first message, that is, the time when the first communication device receives the first message, for example, 10 hours, 0 minutes, and 0 seconds.

In an example, the first reception time information may be a relative reception time period of the first message, that is, a time when the first communication device receives the first message relative to a reference time period, for example, 1 ms. In one example, the first reception time information may be time domain location information of the first message. For example, the first reception time information may be the radio frame number of the resource where the first message is located.

In an example, the first reception time information may be an offset of the time domain position of the resource where the first message is located relative to the time domain reference position, for example, 10 radio frame intervals after the fifth radio frame . In one example, the first reception time information may be information related to time domain position information of the first message, for example, frequency domain position information, code domain position information of the first message, and so on.

304. The first communication device obtains a first time offset according to the first transmission time information and the first reception time information.

In other words, the first communication device can process any form of first transmission time information and any form of first reception time information to obtain the first time offset. That is, for any combination of any possible form of the first transmission time information and any possible form of the first reception time information, the first communication device can process to obtain the first time offset. The first sending time information includes, at least one of the sending time of the first message, or the relative sending time period relative to the reference, or the time domain position on the time domain resource, which is not limited here; the first The reception time information includes at least one of the reception time of the first message, or the relative reception time period relative to the reference, or the time domain position on the time domain resource, which is not limited herein.

Optionally, the first time offset may be an air interface transmission delay, that is, the first message is air interface signaling, and the first time offset is the first message from the second communication device to the first Transmission delay of communication equipment.

Optionally, the first time offset may be any form for indicating a time offset between the time when the second communication device sends the first message and the time when the first communication device receives the first message Information. For example, the first time offset may indicate a time offset between the time when the second communication device sends the first message and the time when the first communication device receives the first message, for example, 64 unit times, Among them, the "unit time" mentioned in this application includes a predefined amount of time by the system, for example, unit time = 1/480/4096 (ms); for another example, the interval is 5 subframes.

Optionally, the first time offset may be used to instruct the first communication device to send other messages in advance. In other words, the first communication device may send ahead by a time offset when sending the message next time, and the one time offset matches the first time offset. For example, the first time offset is 64 unit times, and the first communication device may send a message in advance 64 unit times according to the first time offset, so that the message can be The time domain position is received by the second communication device.

Optionally, the second communication device sends a cell ID to the first communication device. Correspondingly, the first communication device receives the cell ID sent by the second communication device, and obtains the correspondence between the first time offset and the cell ID. In other words, the first communication device may count the first time offset corresponding to each cell ID sent by the second communication device, and the first communication device may send a message to the corresponding cell next time according to The first time offset corresponding to the cell ID is sent in advance. In addition, different cells only synchronize according to the cell closest to them without acquiring global synchronization information, which can reduce the overhead of synchronization signaling.

Optionally, the first communication device receives first messages sent by multiple cells, and obtains multiple first time offsets corresponding to the multiple cells. In other words, the first communication device receives the first messages sent by the multiple cells, acquires the first transmission time information and the first reception time information corresponding to the multiple cells, and thereby acquires the multiple first messages corresponding to the multiple cells Time offset. The first communication device can thus count the first time offset corresponding to each of the multiple cells, and send a message to the corresponding cell in advance according to the first time offset; or, the first communication device can obtain The multiple first time offsets are broadcast to multiple cells for synchronization with multiple cells to achieve high-precision collaboration.

Optionally, the second communication device sends a first message to the first communication device, the third communication device receives the second message sent by the second communication device, or the second communication device receives the tenth message sent by the third communication device, The first communication device can obtain first transmission time information and first reception time information, thereby obtaining the first time offset; the second communication device can obtain tenth transmission time information and tenth reception time information, so that the first The communication device may acquire a tenth time offset, the tenth sending time information is used to indicate the time when the tenth message is sent, the tenth receiving time information is used to indicate the time when the tenth message is received, and the tenth time offset The shift amount can be obtained through the tenth transmission time information and the tenth reception time information. The first communication device may acquire the synchronization error between the first communication device and the third communication device according to the first time offset and the tenth time offset. In other words, the first communication device acquires the first communication device and the third communication device through the synchronization error between the first communication device and the second communication device, and the synchronization error between the second communication device and the third communication device Synchronization error. Therefore, the first communication device may send a message to the third communication device in advance according to the first time offset and the tenth time offset; or, maintain accurate synchronization with the second communication device and the third communication device, Achieve high-precision collaboration. The method for synchronizing the first communication device with the second communication device and the third communication device can be further used for synchronization between more communication devices, which will not be repeated here.

Optionally, the first communication device sends a fifth message to the second communication device, where the fifth message carries information indicating the first time offset. Correspondingly, the second communication device receives the fifth message sent by the first communication device. That is, the second communication device is acquiring the first time offset sent by the first communication device, and the second communication device may synchronize with the first communication device according to the first time offset.

Optionally, the first time offset may be used to instruct the second communication device to send other messages in advance. In other words, the second communication device may send ahead by a time offset when sending the message next time, and the one time offset matches the first time offset.

Optionally, the first communication device may send a cell ID to the second communication device. Correspondingly, the second communication device receives the cell ID sent by the first communication device, and obtains the correspondence between the first time offset and the cell ID. In other words, the second communication device can count the first time offset corresponding to each cell ID sent by the first communication device, and the second communication device can send the message to the corresponding cell next time according to The first time offset corresponding to the cell ID is sent in advance. In addition, different cells only synchronize according to the cell closest to them without acquiring global synchronization information, which can reduce the overhead of synchronization signaling.

[Example 1]

As shown in FIG. 4, the second communication device sends the first message, and the first communication device receives the first message sent by the second communication device, where the time when the second communication device sends the first message is T ₁ , the first The moment when a communication device receives the first message is T′ ₁ .

Obtaining a first communication device a first transmission time information T ₁ and the first reception time information T _'1, according to the time information T _1, and time information T' ₁ acquires the first time offset A, wherein, A is The first time offset.

Optionally, obtaining the first time offset A according to the time information T ₁ and the time information T′ ₁ specifically includes that the first time offset A satisfies: A=T′ ₁ -T ₁ .

In the embodiment of the present application, the first communication device receives the first message sent by the second communication device, and obtains the first time offset according to the sending time and the receiving time of the first message, so that the first message can be obtained The transmission delay of the first message from the second communication device to the first communication device weakens the influence of the transmission delay on message transmission, and improves the synchronization accuracy between the first communication device and the second communication device. For example, the first communication device may send the next message in advance according to the first time offset, and the next message may arrive at the second communication device before the specified time, or the first communication device and/or the second The communication device processes or executes the received information instruction according to the acquired time offset to achieve collaboration under synchronization.

501. The second communication device sends the first message. Correspondingly, the first communication device receives the first message sent by the second communication device.

502. The first communication device obtains first transmission time information, where the first transmission time information is an offset of a first time-domain reference position relative to a time-domain position at which the second communication device sends the first message.

503. The first communication device acquires first reception time information, where the first reception time information is an offset of the second time-domain reference position relative to the time-domain position of the first communication device receiving the first message.

For a specific implementation manner of steps 501 to 503, reference may be made to steps 301 to 303 in the embodiment shown in FIG. 3, and details are not described here.

504. The first communication device obtains a first reference offset, where the first reference offset is a time offset between the first reference and the second reference, and the first reference is the second reference offset. For reference, the second reference is a reference of the first communication device.

In fact, when the device determines a certain time or a certain moment, it is based on a certain reference, for example, it can be the reference of the device itself, such as its own clock, the time domain position of the sent message, etc.; for example, it can be indicated by other devices Reference, such as the time indicated by other devices, the time domain position of the received message, etc. For convenience of description, in this application, references used by the communication device to determine information related to time or time are collectively referred to as references. The references of different communication devices are not necessarily the same.

The first reference is a reference of the second communication device, which means that the second communication can refer to the first reference to determine the time when the second communication device sends the first message. In other words, the first reference may be any reference that the second communication device determines when the second communication device sends the first message. The first reference may be set randomly, or may be predefined or configured. In one example, the first reference may be a time, for example, 9 hours, 0 minutes, and 0 seconds. In one example, the first reference may be a time domain position, for example, a time domain start position of an even-numbered radio frame. In one example, the first reference may be the time indicated by the clock of the second communication device.

The second reference is a reference of the first communication device, which means that the first communication can refer to the second reference to determine the time when the first communication device receives the first message. In other words, the second reference may be any reference that the first communication device determines when the first communication device received the first message. The second reference may be set randomly, or may be predefined or configured. In one example, the second reference may be a time, for example, 10 hours, 0 minutes, and 0 seconds. In one example, the second reference may be a time domain position, for example, a time domain start position of an even-numbered wireless frame. In one example, the second reference may be the time indicated by the clock of the first communication device.

The first reference offset may be information indicating a time offset between any form of reference and any form of reference.

Optionally, the first reference offset may be a specific time period.

In one example, the first reference offset may be a time offset between time and time. For example, the second reference is 10 hours, 0 minutes, and 0 seconds, and the first reference is 9 hours, 0 minutes, and 0 seconds, and the first reference offset is 1 hour.

In one example, the first reference offset may be the time offset between the time domain position and the time. For example, the second reference is the upper border of the fifth radio frame, and the first reference is 10 hours, 0 minutes, and 0 seconds. The first communication device may correspond to the upper border of the fifth radio frame with the time. The upper edge of the radio frame corresponds to 9:0:0, and the first reference offset is 1:0:0:0.

In one example, the first reference offset may be a clock-to-clock time offset. For example, the second reference is the clock of the first communication device, the first reference is the clock of the second communication device, the clock of the second communication device is 1 second faster than the clock of the first communication device, then the first One reference offset is 1 second.

Optionally, the first reception time information may be other information related to time, such as time domain resource information, frequency domain location information, code domain location information, and so on.

In one example, the first reference offset may be a time offset between the time domain position and the time domain position. For example, the second reference is the upper border of the fifth radio frame, the first reference is the upper border of the fourth radio frame, and the first reference offset is 1 radio frame interval.

There are many ways for the first communication device to obtain the first reference offset, for example, the first communication device sends other messages to obtain information about the reception time of the other messages and information about the transmission time to obtain the first reference offset Shift amount; for another example, send other messages through the first communication device to obtain the aligned first and second references, and obtain the first reference offset according to the first sending time information and the first receiving time information Shift amount. For specific methods, reference may be made to the embodiments of FIG. 7, FIG. 12, and FIG. 15, and details are not described here.

505. The first communication device acquires the first time offset according to the first transmission time information, the first reception time information, and the first reference offset. In other words, in addition to considering the first transmission time information and the first reception time information, the first communication device also considers the time offset between the reference of the first communication device and the reference of the second communication device.

In one example, the first communication device may deduct the first reference offset from the difference between the first reception time information and the first transmission time information to obtain the first time offset. For example, the second communication device determines that the time when the second communication device sends the first message is 10:0:0, and the second communication device indicates the time when the first message is sent to the first communication device, the The moment when the first communication device receives the first message is 10 hours, 0 minutes, and 0 seconds, the clock of the second communication device is one hour later than the clock of the first communication device, then the first reference offset is 1 hour , The first communication device may determine that the first time offset is 1 hour.

In one example, the first communication device may align the reference of the first communication device with the reference of the second communication device according to the first reference offset, and acquire the after the alignment of the first reference and the second reference For the first transmission time information and the first reception time information, obtain the first time offset according to the first transmission time information and the first reception time information after aligning the first reference and the second reference. For example, if the clock of the second communication device is one hour later than the clock of the first communication device, the second communication device determines that the time when the second communication device sends the first message is 10 hours, 0 minutes, and 0 seconds. A reference offset is 1 hour, the first communication device may align the clock of the first communication device with the clock of the second communication device, and determine that the time when the first communication device receives the first message is 11 o'clock 0 minutes and 0 seconds, then the first communication device may determine that the first time offset is 1 hour.

For a specific implementation manner of step 505, reference may be made to step 304 in the embodiment shown in FIG. 3, and details are not described here.

[Example 2]

As shown in FIG. 6, the second communication device sends a first message, and the first communication device receives the first message sent by the second communication device, where the time when the second communication device sends the first message is T ₁ , the first The moment when a communication device receives the first message is T′ ₁ .

The second communication device determines a first time domain reference position, and the time corresponding to the first time domain reference position is T ₀ . The second communication device sends first transmission time information to the first communication device, where the first transmission time information is a deviation of the first time domain reference position relative to the time domain position of the second communication device sending the first message The shift amount, that is, the time offset corresponding to the first transmission time information is t ₁ =T ₁ -T ₀ . The first communication device obtains the first transmission time information.

The first communication device determines a second time domain reference position, and the time corresponding to the second time domain reference position is T′ ₀ . The first communication device acquires first reception time information, where the first reception time information is an offset of the second time-domain reference position relative to the time-domain position at which the first communication device receives the first message, that is, the first The time offset corresponding to the received time information is t′ ₁ =T′ ₁ -T′ ₀ .

The first communication device acquires a first reference offset, which is a time offset B=T ₀ -T′ ₀ of the first time domain reference position and the second time domain reference position.

The first communication device acquires the first time offset according to A=t′ ₁ -t ₁ -B, where A is the first time offset.

In the embodiment of the present application, when the first time domain reference position and the second time domain reference position are inconsistent (for example, the clock of the first communication device is inconsistent with the clock of the second communication device), only The first time offset obtained by the first sending time information and the first receiving time information is inaccurate. On the one hand, combining the first sending time information, the first receiving time information, and the first reference offset, the obtained first time offset is more accurate; on the other hand, in the first time domain reference position When there is no change from the second time-domain reference position, repeatedly using the first reference offset can reduce signaling overhead for acquiring the first time offset.

701. The first communication device sends a second message. Correspondingly, the second communication device receives the second message sent by the first communication device.

Optionally, the first communication device may periodically send the second message. For example, the first communication device sends a second message every 2 ms, or sends a second message every 20 ms.

Optionally, the first communication device may trigger sending the second message according to the configuration. Taking the triggering of sending the second message according to the configuration as an example, one way is that the first communication device can trigger the first communication device to send the second message according to whether a trigger signal of another communication device is received; another way Yes, the first communication device may trigger the first communication device to periodically send the second message according to whether a trigger signal of another communication device is received, for example, the first communication device may use a pre-configured The second message is sent every 2 radio frames, or every 20 ms. Optionally, the triggered periodic transmission may end the periodic transmission according to the configuration, or a trigger signal, or a predefined parameter. For example, after the first communication device sends the second message every 20 ms, it receives Trigger signal sent periodically; the first communication device ends sending the second message; or, the first communication device sends the second message every 20ms within 80ms, and the first communication device stops sending the second message after 80ms news. The triggering sending according to the configuration further includes that the first communication device measures the signal sent by the second communication device to obtain synchronization error information; if the synchronization error exceeds a given threshold, the first communication device triggers sending the second message.

Optionally, the second message may be an uplink trigger signal (such as a random access preamble Preamble, a signal carrying Msg.1), SS/PBCH block, primary synchronization signal, secondary synchronization signal, and channel demodulation reference signal (demodulation At least one of reference (signal, DMRS) and channel quality measurement reference symbol (channel-state information-reference signal (CSI-RS).

Optionally, the second communication device sends a second resource message, and the second resource message is used to indicate the resource used by the first communication device to send the second message, and the resource of the second message includes a time domain resource and a frequency domain At least one of resources and code domain resources. Correspondingly, the first communication device receives the second resource message sent by the second communication device, and the first communication device sends the second message, including: the first communication device sends the second resource message according to the second resource message news. In other words, the second communication device may indicate the resource used by the first communication device to send the second message, and the first communication device sends the second message on the resource indicated by the second communication device. Taking time-frequency resources as an example, the second communication device sends a second resource message 1, and the second resource message 1 indicates a time-domain and/or frequency-domain resource used by the first communication device to send the second message, for example: {Time unit 1, band range 1}, or {time unit 2, band range 2}; further, the first communication device according to the second resource message 1, the time unit 1, band range in the indicated resource 1 sends the second message. For another example, the second communication device sends a second resource message 2 indicating the time domain position of the OFDM symbol in the time slot occupied by the first communication device, such as the time domain of the OFDM symbol where the message is received The location, or, the time-domain location of the OFDM symbol where the message is sent, or not limited to the time-domain location of the OFDM symbol received or transmitted.

702. The second communication device obtains a first time-domain reference position.

The first time domain reference location may be the location of a time domain resource or other resources related to the time domain resource. For example, the start position of the even-numbered radio frame in the time domain. As another example, the frequency band 1 related to the time domain position.

Optionally, the second communication device may determine the first time domain reference position. For example, the second communication device may use the time domain starting position of each radio frame as a time domain reference position, and multiple time slots after the first time domain reference position refer to the first time domain reference position. For another example, the second communication device may use the starting position of the radio frame where the second message is located as the first time-domain reference position.

Optionally, the first time domain reference location may be the time domain location where the second communication device receives the second message. For example, the first time domain reference position may be the time domain starting position of the radio frame where the second message is located.

Optionally, the first time domain reference position may be determined according to the received second message. For example, the second message carries time-domain location information, and the time-domain location information is used to indicate a time-domain offset between the time-domain location of the received second message and the first time-domain reference location.

703. The first communication device obtains the second time-domain reference position according to the time-domain position of the second message sent by the first communication device.

The second time domain reference location may be the location of time domain resources or other resources related to time domain resources. For example, the start position of the even-numbered radio frame in the time domain. As another example, the frequency band 1 related to the time domain position.

Optionally, before the first communication device obtains the second time domain reference position according to the time domain position of the second message sent by the first communication device, the method further includes: the first communication device Acquiring a second reception time, where the second reception time is an offset of the first time-domain reference position relative to the time-domain position at which the second communication device receives the second message; the first communication The device acquiring the second time-domain reference position according to the time-domain position of the second message sent by the first communication device includes: the first communication device according to the time when the second message is sent by the first communication device Acquiring the second time domain reference position based on the domain position and the second receiving time.

In other words, the first communication device acquires the time offset of the time-domain position of the second message received by the second communication device relative to the first time-domain reference position of the second communication device, that is, the second reception time, The first communication device advances the offset corresponding to the second reception time forward or backward from the time domain position at which the second message was sent by the first communication device to obtain the second time domain reference position. The first communication device may align the first time domain reference position of the second communication device with the second time domain reference position, and the time domain position of the second message received by the second communication device relative to the first time The time offset of the domain reference position is the same as the time offset of the time domain position of the second message received by the first communication device relative to the second time domain reference position. For example, if the first time domain reference position is frame 15 and the second communication device receives the second message in time frame position 16, then the second reception time is 1 frame interval; the first communication The time domain position at which the device sends the second message is the 11th frame, and the first communication device may determine that the second time domain reference position is the 10th frame according to the second reception time.

Optionally, the first message carries information indicating the second reception time; obtaining the second reception time by the first communication device includes: the first communication device according to the indication carried by the first message the second For information about the reception time, obtain the second reception time. For example, the first communication device parses the first message to obtain the second reception time.

Optionally, the first communication device receives a third time message, and the third time message carries information indicating the second reception time; obtaining the second reception time by the first communication device includes: Obtain the second reception time by the information indicating the second reception time carried in the third time message. For example, the first communication device parses the third time message to obtain the second reception time information.

Optionally, the first time domain reference location may be the time domain location where the second communication device receives the second message. For example, the first time domain reference position may be the upper edge of the time domain resource where the second message is located.

704. The second communication device sends a first message and first sending time information. The first sending time information is a deviation of the first time domain reference position relative to the time domain position of the second communication device sending the first message Shift amount. Correspondingly, the first communication device receives the first message sent by the second communication device, and obtains the first sending time information.

There may be various forms of the offset of the first time domain reference position relative to the time domain position at which the second communication device sends the first message; it may be an offset in the sense of time, for example, 64 unit times; It may also be the offset of the time domain position, for example, 5 subframe intervals; or may be other offsets used to represent the time offset, for example, the offset of the frequency domain resource related to the time domain position.

Optionally, the second communication device may send the first message before receiving the second message. Correspondingly, the first communication device may send the second message after receiving the first message.

Optionally, the first message carries the first sending time information. In this case, the first communication device may obtain the first sending time information carried by the first message by parsing the content of the first message.

Optionally, the first sending time information may also be carried by other messages. For example, the second communication device may send a first time message before sending the first message or after sending the first message, where the first time message carries the first sending time information; correspondingly, the first A communication device receives the first time message sent by the second communication device. In this case, the first communication device may obtain the first sending time information carried by the first time message by parsing the content of the first time message.

For a specific implementation manner of step 704, reference may be made to step 301 in the embodiment shown in FIG. 3, and details are not described here.

705. The first communication device acquires first reception time information, where the first reception time information is used to indicate the time when the first communication device receives the first message.

For a specific implementation manner of step 705, reference may be made to step 303 in the embodiment shown in FIG. 3, and details are not described here.

706. The first communication device obtains the first time offset according to the first transmission time information and the first reception time information.

In other words, the first communication device can offset the time domain position of the first message from the first time domain position in any form of the second communication device and the first reception time information in any form Perform processing to obtain the first time offset. For example, the first transmission time information is an interval of 1 radio frame, the first reception time information may be the 20th radio frame, the second reference time domain position is the 18th radio frame, and the first time offset It is 0.5 radio frames. For another example, the first transmission time information is 1s, the first reception time information is 2s, and the first time offset is 0.5s.

Optionally, the first time offset may be an air interface transmission delay, that is, the second message and the first message are both air interface signaling, and the first time offset is the first message from the second The transmission delay from the communication device to the first communication device.

Optionally, the first time offset meets:

Optionally, K may be predefined, or configured, or indicated by dynamic signaling, or indicated according to configuration information and dynamic signaling. For example, the value K of the configuration information configuration includes {1.2,1.4,1.6,1.8}, and dynamic signaling indicates that the value {1.8} is used as the value of K; or the predefined value of K includes {1.2,1.4, 1.6, 1.8}, indicating the specific value of K through high-level signaling or dynamic signaling; or the predefined value of K is 2.

Since the first time domain reference position and the second time domain reference position have been aligned, the formula

The time offset between the first time-domain reference position and the second time-domain reference position may be offset.

Optionally, when the time when the first communication device sends the second message and the time offset at which the second communication device receives the second message are the same as the value of the first time offset, K is 2. In other words, the time offset between the first time domain reference position and the second time domain reference position is the same as the first time offset value.

Optionally, the first communication device may obtain a first reference offset according to the first transmission time information and the first reception time information, where the first reference offset is the first time domain reference position and the The time offset of the second time domain reference position.

Optionally, the first reference offset meets:

In other words, the time offset required to align the first time-domain reference position with the second time-domain reference position can be calculated by the formula

inferred.

Optionally, when the time at which the first communication device sends the second message is the same as the time offset at which the second communication device receives the second message and the value of the first time offset, K is 2 . In other words, the first reference offset value is the same as the first time offset value.

Optionally, after the first communication device acquires the first reference offset, the first reference offset may be applied. For example, the next time the first communication device sends the first message, it may obtain the first time offset according to the time when the first message is sent, the time when the first message is received, and the first reference offset. For a specific implementation manner, reference may be made to step 505 in the embodiment shown in FIG.

Optionally, the first time offset may be used to instruct the first communication device to send other messages in advance. In other words, the first communication device may send ahead by a time offset when sending the message next time, and the one time offset matches the first time offset. For example, the first time offset is 64 unit times, and the first communication device may send a message in advance 64 unit times according to the first time offset, so that the message can be Received by the second communication device in the time domain.

Optionally, the first communication device sends a fifth message to the second communication device, where the fifth message carries information indicating the first time offset and/or the first reference offset. Correspondingly, the second communication device receives the fifth message sent by the first communication device, and obtains information about the first time offset and/or the first reference offset. That is to say, the second communication device is acquiring the first time offset and/or the first reference offset sent by the first communication device, the second communication device may be based on the first time offset The amount is synchronized with the first communication device.

[Example 3]

As shown in FIG. 8, the first communication device sends a second message, where the time corresponding to the time domain position at which the first communication device sends the second message is T ₂ . The second communication device receives the second message sent by the first communication device, and the time corresponding to the time domain position where the second communication device receives the second message is T′ ₂ . The second communication device determines a first time domain reference position, and the time corresponding to the first time domain reference position is T ₀ . The second communication device sends a second reception time to the first communication device, where the second reception time is an offset of the first time domain reference position relative to the time domain position at which the second communication device receives the second message , That is, the time offset corresponding to the second receiving time is T′ ₂ -T ₀ . The first communication device obtaining a second reception time of the second communication device transmits, to promote T _'2 -T ₀ time offset forwardly from the time T _2, the second time domain acquisition reference position, the second time domain The time corresponding to the reference position is T′ ₀ .

The second communication device sends a first message, and the first communication device receives the first message sent by the second communication device, where the time corresponding to the time domain position at which the first communication device receives the first message is T′ ₁ , the time corresponding to the time domain position at which the second communication device sends the first message is T ₁ .

The first communication device acquires first transmission time information and first reception time information; wherein, the first transmission time information is a deviation of the first time-domain reference position relative to the time-domain position of the second communication device sending the first message Shift amount, the time offset corresponding to the first sending time information is t ₁ =T ₁ -T ₀ ; the first receiving time information is the second time domain reference position relative to the first communication device receiving the first The offset of the time domain position of a message, the time offset corresponding to the first received time information is t′ ₁ =T′ ₁ -T′ ₀ .

The first communication device is based on

Obtain the first time offset, where A is the first time offset.

The first communication device is based on

Obtain the first reference offset, where B is the first reference offset.

[Example 4]

As shown in FIG. 9, the second communication device sends a first message, and the first communication device receives the first message sent by the second communication device, where the time domain location of the first message received by the first communication device The corresponding time is T′ ₁ , and the time corresponding to the time domain position at which the second communication device sends the first message is T ₁ .

The first communication device sends a second message, where the time corresponding to the time domain position at which the first communication device sends the second message is T ₂ . The second communication device receives the second message sent by the first communication device, and the time corresponding to the time domain position where the second communication device receives the second message is T′ ₂ . The second communication device determines the first time domain reference position, and the time corresponding to the first time domain reference position is T ₀ . The second communication device sends a second reception time to the first communication device, where the second reception time is an offset of the first time domain reference position relative to the time domain position at which the second communication device receives the second message , That is, the time offset corresponding to the second receiving time is T′ ₂ -T ₀ . The first communication device obtains the second reception time sent by the second communication device, advances the time offset of T′ ₂ -T ₀ from time T ₂ , obtains the second time-domain reference position, and the second time-domain reference The time corresponding to the position is T′ ₀ .

The first communication device is based on

Obtain the first time offset, where A is the first time offset.

The first communication device is based on

Obtain the first reference offset, where B is the first reference offset.

[Example 5]

As shown in FIG. 10, the first communication device sends a second message, where the time corresponding to the time domain position at which the first communication device sends the second message is T ₂ . The second communication device receives the second message sent by the first communication device, and the time corresponding to the time domain position where the second communication device receives the second message is T′ ₂ . The second communication device determines that the first time domain reference position is the time domain position where the second communication device receives the second message, and the time corresponding to the first time domain reference position is T ₀ . The first communication device acquiring the second time domain reference position is the time domain position at which the first communication device sends the second message, and the time corresponding to the second time domain reference position is T′ ₀ .

The second communication device sends a first message, and the first communication device receives the first message sent by the second communication device, where the time corresponding to the time domain position at which the first communication device receives the first message is T ′ ₁ , the time corresponding to the time domain position at which the second communication device sends the first message is T ₁ .

The first communication device is based on

Obtain the first time offset, where A is the first time offset.

The first communication device is based on

Obtain the first reference offset, where B is the first reference offset.

[Example 6]

As shown in FIG. 11, the second communication device sends a first message, and the first communication device receives the first message sent by the second communication device, where the time domain location of the first message received by the first communication device The corresponding time is T′ ₁ , and the time corresponding to the time domain position at which the second communication device sends the first message is T ₁ .

The first communication device sends a second message, where the time corresponding to the time domain position at which the first communication device sends the second message is T ₂ . The second communication device receives the second message sent by the first communication device, and the time corresponding to the time domain position where the second communication device receives the second message is T′ ₂ . The second communication device determines that the first time domain reference position is the time domain position where the second communication device receives the second message, and the time corresponding to the first time domain reference position is T ₀ . The first communication device acquiring the second time domain reference position is the time domain position at which the first communication device sends the second message, and the time corresponding to the second time domain reference position is T′ ₀ .

The first communication device is based on

Obtain the first time offset, where A is the first time offset.

The first communication device is based on

Obtain the first reference offset, where B is the first reference offset.

In the embodiment of the present application, the first communication device sends the second message, so that the second communication device can determine the first time domain reference position, and the first communication device can determine the second time domain reference position. , Combining the first sending time information and the first receiving time information, can offset the time offset between the first time domain reference position and the second time domain reference position, thereby obtaining the first time offset more accurately the amount.

1201. The first communication device acquires a second time-domain reference position.

Optionally, the first communication device may determine the second time domain reference position. For example, the first communication device may use the time domain starting position of each radio frame as a time domain reference position, and multiple time slots after the second time domain reference position all refer to the second time domain reference position. For another example, the first communication device may use the starting position of the radio frame where the third message is located as the second time-domain reference position.

1202. The first communication device sends a third message and a third sending time, where the third sending time is an offset of the second time domain reference position relative to the time domain position at which the first communication device sends the third message . Correspondingly, the second communication device receives the third message sent by the first communication device, and the second communication device receives the third transmission time sent by the first communication device.

Optionally, the first communication device may periodically send the third message. For example, the first communication device sends a third message every 2 ms, or sends a third message every 20 ms.

Optionally, the first communication device may trigger sending the third message according to the configuration. Taking the triggering of sending the third message according to the configuration as an example, one way is that the first communication device can trigger the first communication device to send the third message according to whether a trigger signal of another communication device is received; another way Yes, the first communication device may trigger the first communication device to periodically send the third message according to whether a trigger signal of another communication device is received, for example, the first communication device may use a pre-configured The third message is sent every 2 radio frames, or every 20 ms. Optionally, the triggered periodic transmission may end the periodic transmission according to the configuration, or a trigger signal, or a predefined parameter. For example, after the first communication device sends the third message every 20 ms, it receives Trigger signal sent periodically; the first communication device ends sending the third message; or, the first communication device sends the third message every 20ms within 80ms, and the first communication device stops sending the third message after 80ms news. The triggering sending according to the configuration further includes that the first communication device measures the signal sent by the second communication device to obtain synchronization error information; if the synchronization error exceeds a given threshold, the first communication device triggers sending the third message.

Optionally, the third message may be an uplink trigger signal (such as a random access preamble Preamble, a signal carrying Msg.1), SS/PBCH block, primary synchronization signal, secondary synchronization signal, and channel demodulation reference signal (demodulation At least one of reference (signal, DMRS) and channel quality measurement reference symbol (channel-state information-reference signal (CSI-RS).

Optionally, the second communication device sends a third resource message, where the third resource message is used to indicate resources used by the first communication device to send the third message. The resources of the third message include time domain resources and frequency domain resources. At least one of resources and code domain resources. Correspondingly, the first communication device receives the third resource message sent by the second communication device, and the first communication device sends the third message, including: the first communication device sends the third resource message according to the third resource message news. In other words, the second communication device may indicate the resource used by the first communication device to send the third message, and the first communication device sends the third message on the resource indicated by the second communication device. Taking time-frequency resources as an example, the second communication device sends a third resource message 1, and the third resource message 1 indicates a time-domain and/or frequency-domain resource used by the first communication device to send the third message, for example: {Time unit 1, band range 1}, or {time unit 2, band range 2}; further, the first communication device according to the third resource message 1, time unit 1, band range in the indicated resource The third message is sent on 1. For another example, the second communication device sends a third resource message 2 indicating the time domain position of the OFDM symbol in the time slot occupied by the first communication device, such as the time domain of the OFDM symbol where the message is received The location, or, the time-domain location of the OFDM symbol where the message is sent, or not limited to the time-domain location of the OFDM symbol received or transmitted.

1203. The second communication device obtains the first time-domain reference position according to the time-domain position of the third message received by the second communication device and the third transmission time.

Optionally, the first time domain reference position may be determined according to the received third message. For example, the third message carries time domain location information, and the time domain location information is used to indicate a time domain offset between the time domain location of the received third message and the first time domain reference location.

In other words, the second communication device acquires the time offset of the time domain position at which the first communication device sends the third message relative to the second time domain reference position, that is, the third transmission time, and the second communication device The time domain position of the third message received by the second communication device advances forward or backward by an offset corresponding to the third sending time to obtain the first time domain reference position. The second communication device may align the second time domain reference position of the first communication device with the first time domain reference position, that is, the time domain position of the third message sent by the first communication device relative to the second time The time offset of the domain reference position is the same as the time offset of the time domain position of the second message received by the second communication device relative to the first time domain reference position. For example, if the second time domain reference position is the 10th frame and the first communication device sends the third message the time domain position is the 11th frame, then the third transmission time is an interval of 1 frame; the second communication device The time domain position where the third message is received is the 16th frame, and the second communication device may determine the first time domain reference position as the 15th frame according to the third transmission time.

Optionally, the third message carries information indicating the third sending time; obtaining the third sending time by the second communication device includes: the second communication device according to the indication carried by the third message For information about the sending time, obtain the third sending time. For example, the first communication device writes the third transmission time code into the third message, and the second communication device parses the third message to obtain the third transmission time information.

Optionally, the second communication device receives a third transmission time message, and the third transmission time message carries information indicating the third transmission time; the second communication device acquiring the third transmission time includes: the second communication The device obtains the third sending time according to the information indicating the third sending time carried in the third sending time message. For example, the first communication device writes the third transmission time code into the third transmission time message, and the second communication device parses the third transmission time message to obtain the third transmission time information.

1204, the second communication device sends a first message and first sending time information, where the first sending time information is a deviation of the first time domain reference position relative to the time domain position of the second communication device sending the first message Shift amount. Correspondingly, the first communication device receives the first message sent by the second communication device. Correspondingly, the first communication device obtains the first sending time information.

There may be various forms of the offset of the first time domain reference position relative to the time domain position at which the second communication device sends the first message; it may be an offset in the sense of time, for example, 64 unit times; The offset in the time domain position may also be used. For example, the five subframe intervals may be other offsets used to represent the time offset, for example, the offset in the frequency domain resource related to the time domain position.

Optionally, the second communication device may send the first message before receiving the third message. Correspondingly, the first communication device may send the third message after receiving the first message.

For a specific implementation manner of step 1204, reference may be made to step 301 in the embodiment shown in FIG. 3, and details are not described here.

1205. The first communication device obtains first reception time information, where the first reception time information is used to indicate the time when the first communication device receives the first message.

For a specific implementation manner of step 1205, reference may be made to step 303 in the embodiment shown in FIG. 3, and details are not described here.

1206. The first communication device obtains the first time offset according to the first transmission time information and the first reception time information.

Optionally, the first time offset may be an air interface transmission delay, that is, the third message and the first message are both air interface signaling, and the first time offset is the first message from the second The transmission delay from the communication device to the first communication device.

Optionally, the first time offset meets:

Optionally, when the time at which the first communication device sends the third message and the time offset at which the second communication device receives the third message are the same as the value of the first time offset, K is 2. In other words, the time offset between the first time domain reference position and the second time domain reference position is the same as the first time offset value.

Optionally, the first reference offset meets:

inferred.

Optionally, when the time at which the first communication device sends the third message is the same as the value of the time offset at which the second communication device receives the third message and the first time offset, K is 2 . In other words, the first reference offset value is the same as the first time offset value.

Optionally, the first time offset may be used to instruct the first communication device to send other messages in advance. In other words, the first communication device may send in advance by a time offset when sending the message next time, and the one time offset matches the first time offset. For example, the first time offset is 64 unit times, and the first communication device may send a message in advance 64 unit times according to the first time offset, so that the message can be Received by the second communication device in the time domain.

[Example 7]

As shown in FIG. 13, the second communication device determines the second time domain reference position, and the time corresponding to the second time domain reference position is T′ ₀ . The first communication device sends a third message, where the time corresponding to the time domain position at which the first communication device sends the third message is T ₃ . The second communication device receives the third message sent by the first communication device, and the time corresponding to the time domain position where the second communication device receives the third message is T′ ₃ . The second communication device sends a third transmission time to the second communication device, where the third transmission time is an offset of the second time domain reference position relative to the time domain position at which the first communication device sends the third message , That is, the time offset corresponding to the third sending time is T ₃ -T′ ₀ . The second communication device acquires the third transmission time sent by the first communication device, advances the time offset of T ₃ -T′ ₀ from time T′ _{3 to} obtain the first time-domain reference position, and the second The time corresponding to the time-domain reference position is T ₀ .

The first communication device is based on

Obtain the first time offset, where A is the first time offset.

The first communication device is based on

Obtain the first reference offset, where B is the first reference offset.

[Example 8]

As shown in FIG. 14, the second communication device sends a first message, and the first communication device receives the first message sent by the second communication device, where the time domain position corresponding to the first message received by the first communication device corresponds to Is T′ ₁ , and the time corresponding to the time domain position at which the second communication device sends the first message is T ₁ .

The second communication device determines a second time domain reference position, and the time corresponding to the second time domain reference position is T′ ₀ . The first communication device sends a third message, where the time corresponding to the time domain position at which the first communication device sends the third message is T ₃ . The second communication device receives the third message sent by the first communication device, and the time corresponding to the time domain position where the second communication device receives the third message is T′ ₃ . The second communication device sends a third transmission time to the second communication device, where the third transmission time is an offset of the second time-domain reference position relative to the time-domain position at which the first communication device sends the third message , That is, the time offset corresponding to the third sending time is T ₃ -T′ ₀ . The second communication device obtains the third transmission time sent by the first communication device, advances the time offset of T ₃ -T′ ₀ from time T′ _{3 to} obtain the first time-domain reference position, and the second The time corresponding to the time-domain reference position is T ₀ .

The first communication device is based on

Obtain the first time offset, where A is the first time offset.

The first communication device is based on

Obtain the first reference offset, where B is the first reference offset.

In an embodiment of the present application, on the one hand, the first communication device sends the third message so that the second communication device can determine the first time domain reference position, and the first communication device can determine the second time domain reference Position, in this way, combined with the first sending time information and the first receiving time information, the time offset between the first time domain reference position and the second time domain reference position can be offset, thereby obtaining the first time more accurately Time offset. On the other hand, according to the second time domain reference position determined by the first communication device and the offset of the second time domain reference position relative to the time domain position at which the first communication device sends the third message, the first The second communication device determines the second time domain reference position. Therefore, the second communication device may determine the first time domain reference position based on the second time domain reference position determined by the first communication device, thereby improving the first time domain reference position A communication device determines the flexibility of the second time domain reference position.

1501. The first communication device sends a fourth message. Correspondingly, the second communication device receives the fourth message sent by the first communication device.

Optionally, the first communication device may periodically send the fourth message. For example, the first communication device sends a fourth message every 1 ms, or sends a fourth message every 20 ms.

Optionally, the first communication device may trigger sending the fourth message according to the configuration. Taking the triggering of sending the fourth message according to the configuration as an example, one way is that the first communication device can trigger the first communication device to send the fourth message according to whether an indication of another communication device is received; another way is , The first communication device may trigger the first communication device to periodically send the fourth message according to whether a trigger signal of another communication device is received, for example, the first communication device may The second message is sent every 2 radio frames or every 20 ms. Optionally, the triggered periodic transmission may end the periodic transmission according to the configuration, or a trigger signal, or a predefined parameter. For example, after the first communication device sends the fourth message every 20 ms, it receives the end Trigger signal sent periodically; the first communication device ends sending the fourth message; or, the first communication device sends the fourth message every 20ms within 80ms, and the first communication device stops sending the fourth message after 80ms news. The triggering sending according to the configuration further includes that the first communication device measures the signal sent by the second communication device to obtain synchronization error information; if the synchronization error exceeds a given threshold, the first communication device triggers sending the fourth message.

Optionally, the fourth message may be an uplink trigger signal (such as a random access preamble Preamble, a signal carrying Msg.1), SS/PBCH block, primary synchronization signal, secondary synchronization signal, and channel demodulation reference signal (demodulation At least one of reference (signal, DMRS) and channel quality measurement reference symbol (channel-state information-reference signal (CSI-RS).

Optionally, the second communication device sends a fourth resource message, where the fourth resource message is used to indicate resources used by the first communication device to send the fourth message, and the resources of the fourth message include time domain resources and frequency At least one of a domain resource and a code domain resource. Correspondingly, the first communication device receives the fourth resource message sent by the second communication device, and the first communication device sends the fourth message, including: the first communication device sends the fourth resource message according to the fourth resource message news. In other words, the second communication device may indicate the resource used by the first communication device to send the fourth message, and the first communication device sends the fourth message on the resource indicated by the second communication device. Taking time-frequency resources as an example, the second communication device sends a fourth resource message 1, which indicates a time-domain and/or frequency-domain resource used by the first communication device to send the fourth message, for example: {Time unit 1, band range 1}, or {time unit 2, band range 2}; further, the first communication device according to the fourth resource message 1, time unit 1, band range in the indicated resource Send the fourth message on 1. For another example, the second communication device sends a fourth resource message 2 indicating the time domain position type of the OFDM symbol in the time slot occupied by the first communication device, such as when receiving the OFDM symbol where the message is located The domain position, or the time domain position of the OFDM symbol where the message is sent, or not limited to the time domain position of the OFDM symbol received or transmitted.

1502. The first communication device obtains fourth transmission time information, where the fourth transmission time information is used to indicate the time when the first communication device sends the fourth message.

Optionally, the fourth sending time information may be information indicating the time when the first communication device sends the fourth message.

In an example, the fourth sending time information may be the sending time of the fourth message, that is, the time when the first communication device sends the fourth message, for example, 10 hours, 0 minutes, and 0 seconds.

In an example, the fourth sending time information may be a relative sending time period of the fourth message, that is, a time when the first communication device sends the fourth message is relative to a reference time period, for example, 1 ms.

In an example, the fourth sending time information may be time domain location information of the fourth message. For example, the fourth transmission time information may be the radio frame number of the resource where the fourth message is located.

In an example, the fourth transmission time information may be the offset of the time domain position of the resource where the fourth message is located relative to the time domain reference position, for example, 10 radio frame intervals after the fifth radio frame .

In an example, the fourth sending time information may be information related to time domain position information of the fourth message, such as frequency domain position information and code domain position information of the fourth message.

1503. The second communication device sends a first message and fourth reception time information. The fourth reception time information is used to indicate the time when the second communication device receives the fourth message. Correspondingly, the first communication device receives the first message sent by the second communication device. Correspondingly, the first communication device acquires the fourth reception time information.

For a specific implementation manner of step 1503, reference may be made to step 301 in the embodiment shown in FIG. 3, and details are not described here.

Optionally, the second communication device may send the first message before receiving the fourth message. Correspondingly, the first communication device may send the fourth message after receiving the first message.

Optionally, the fourth reception time information may be information indicating the time when the second communication device receives the fourth message.

In an example, the fourth reception time information may be the reception time of the fourth message, that is, the time when the second communication device receives the fourth message, for example, 10 hours, 0 minutes, and 0 seconds.

In an example, the fourth reception time information may be a relative reception time period of the fourth message, that is, a time when the second communication device receives the fourth message relative to a reference time period, for example, 1 ms.

In an example, the fourth reception time information may be time domain location information of the fourth message. For example, the fourth reception time information may be the radio frame number of the resource where the fourth message is located.

In an example, the fourth reception time information may be an offset of the time domain position of the resource where the fourth message is located relative to the time domain reference position, for example, 10 radio frame intervals after the fifth radio frame .

In an example, the fourth reception time information may be information related to time-domain position information of the fourth message, such as frequency-domain position information and code-domain position information of the fourth message.

Optionally, the first message carries the fourth reception time information. In this case, the first communication device may obtain the fourth reception time information carried by the first message by parsing the content of the first message.

Optionally, the fourth reception time information may also be carried by other messages. For example, the second communication device may send a fourth time message, and the fourth time message carries the fourth reception time information; correspondingly, the first communication device receives the fourth time message sent by the second communication device. In this case, the first communication device may obtain the fourth reception time information carried by the fourth time message by parsing the content of the fourth time message.

1504. The first communication device obtains first sending time information, where the first sending time information is used to indicate the time when the second communication device sends the first message.

1505. The first communication device acquires first reception time information, where the first reception time information is used to indicate the time when the first communication device receives the first message.

For specific implementations of steps 1504 to 1505, reference may be made to steps 302 to 303 in the embodiment shown in FIG. 3, and details are not described here.

1506. The first communication device acquires the first time offset according to the first transmission time information, the first reception time information, the fourth transmission time information, and the fourth reception time information.

In other words, the first communication device can be used for any form of first transmission time information, for any form of first reception time information, for any form of fourth transmission/reception time information, and for any form of fourth reception time information. Perform processing to obtain the first time offset. That is to say, the first sending time information includes, at least one of the sending time of the first message, or the relative sending time period relative to the reference, or the time domain position on the time domain resource, which is not limited herein The first receiving time information includes, at least one of the receiving time of the first message, or the relative receiving time period relative to the reference, or the time domain position on the time domain resource, which is not limited here; the first The four sending time information includes, at least one of the sending time of the fourth message, or the relative sending time period relative to the reference, or the time domain position on the time domain resource, which is not limited here; the fourth receiving time The information includes at least one of the reception time of the fourth message, or the relative reception time period relative to the reference, or the time domain position on the time domain resource, which is not limited herein.

Optionally, the first time offset may be an air interface transmission delay, that is, the first message and the fourth message are both air interface signaling, and the first time offset is the first message from the second The transmission delay from the communication device to the first communication device, or the transmission time domain of the fourth message from the first communication device to the second communication device.

Optionally, the first time offset may be any form for indicating a time offset between the time when the second communication device sends the first message and the time when the first communication device receives the first message Information. The first time offset may also be any form of information for indicating a time offset between the time when the first communication device sends the fourth message and the time when the second communication device receives the fourth message. For example, the first time offset may indicate a time offset between the time when the second communication device sends the first message and the time when the first communication device receives the first message, for example, 1s; for example, 64 Unit time. For another example, the first time offset may be a time offset indicating the time when the first communication device sends the fourth message and the time when the second communication device receives the fourth message, such as an interval of 64 units Time, or 5 subframes apart.

Optionally, the first time offset meets:

Among them, K may be predefined, or configured, or indicated by dynamic signaling, or indicated according to configuration information and dynamic signaling. For example, the value K of the configuration information configuration includes {1.2,1.4,1.6,1.8}, and dynamic signaling indicates that the value {1.8} is used as the value of K; or the predefined value of K includes {1.2,1.4, 1.6, 1.8}, indicating the specific value of K through high-level signaling or dynamic signaling; or the predefined value of K is 2.

Since the reference of the first communication device and the reference of the second communication device may be different, that is, the reference based on T′ ₁ is different from the reference based on T ₁ , the reference based on T′ ₄ and the reference based on T ₄ different. formula

The time offset between the reference of the first communication device and the reference of the second communication device may be offset.

Optionally, when the time at which the first communication device sends the fourth message and the time offset at which the second communication device receives the fourth message are the same as the value of the first time offset, K is 2. In other words, the time offset between the first time domain reference position and the second time domain reference position is the same as the first time offset value.

Optionally, the first sending time information is the offset of the first time domain reference position relative to the time domain position of the second communication device sending the first message, and the first receiving time information is the second time domain reference The offset of the position relative to the time domain position at which the first communication device receives the first message; the fourth transmission time information is the position of the second time domain reference position relative to the first communication device sending the fourth message The offset of the time domain position, the fourth received time information is the offset of the first time domain reference position relative to the time domain position of the second message received by the second communication device.

Optionally, the first time offset meets:

Where A is the first time offset, t′ _{1 is} the offset of the second time domain reference position relative to the time domain position of the first communication device receiving the first message, and t _{1 is} the first time offset An offset of a time-domain reference position relative to the time-domain position at which the second communication device sends the first message, and t′ _{4 is} the first time-domain reference position relative to the second communication device at which the fourth message is received The offset of the time domain position of t, t _{4 is} the offset of the second time domain reference position relative to the time domain position of the first communication device sending the fourth message, K is less than 2, or greater than 2, or Real number equal to 2.

Since the first time domain reference position may be different from the second time domain reference position, the formula

Optionally, the first communication device obtains the first reference offset according to the first transmission time information, the first reception time information, the fourth transmission time information, and the fourth reception time information, the first reference The offset is the time offset between the first reference and the second reference, the first reference is the reference of the second communication device, and the second reference is the reference of the first communication device.

Optionally, the first reference offset meets:

Since the reference of the first communication device and the reference of the second communication device may be different, that is, the reference based on T′ ₁ is different from the reference based on T ₁ , the reference based on T′ ₄ and the reference based on T ₄ different. According to the formula

Yes, the time offset between the reference of the first communication device and the reference of the second communication device can be obtained.

Optionally, the first reference offset meets:

In other words, the time offset between the first time domain reference position and the second time domain reference position can be obtained by the formula

inferred.

Optionally, when the time at which the first communication device sends the fourth message is the same as the value of the time offset at which the second communication device receives the fourth message and the first time offset, K is 2 . In other words, the first reference offset value is the same as the first time offset value.

[Example 9]

As shown in FIG. 16, the first communication device sends a fourth message, where the time corresponding to the time domain position at which the first communication device sends the fourth message is T ₄ . The second communication device receives the fourth message sent by the first communication device, and the time corresponding to the time domain position where the second communication device receives the fourth message is T′ ₄ .

The first communication device acquires first transmission time information T ₁ , first reception time information T′ ₁ , fourth transmission time information T ₄ , and fourth reception time information T′ ₄ ;

The first communication device is based on

Obtain the first time offset, where A is the first time offset.

The first communication device is based on

Obtain the first reference offset, where B is the first reference offset.

[Example 10]

The first communication device determines a second time domain reference position, and the time corresponding to the second time domain reference position is T′ ₀ . The first communication device obtains fourth transmission time information, where the fourth transmission time information is an offset of the second time-domain reference position relative to the time-domain position at which the first communication device sends the fourth message, that is, the fourth The time offset corresponding to the transmission time information is T ₄ -T′ ₀ .

The second communication device determines a first time domain reference position, and the time corresponding to the first time domain reference position is T ₀ . The second communication device sends fourth reception time information to the first communication device, where the fourth reception time information is a deviation of the first time domain reference position relative to the time domain position where the second communication device receives the fourth message The shift amount, that is, the time offset corresponding to the fourth received time information is T′ ₄ -T ₀ . The first communication device acquires the fourth reception time information.

The second communication device sends first transmission time information to the first communication device, where the first transmission time information is an offset of the first time-domain reference position relative to the time-domain position at which the second communication device sends the first message The amount, that is, the time offset corresponding to the first transmission time information is T ₁ -T ₀ . The first communication device obtains the first transmission time information.

The first communication device acquires first reception time information, where the first reception time information is an offset of the second time-domain reference position relative to the time-domain position at which the first communication device receives the first message, that is, the first The time offset corresponding to the received time information is T ₁ -T′ ₀ .

The first communication device acquires first transmission time information, first reception time information, first transmission time information, and first reception time information. Wherein, the first sending time information is the offset of the first time domain reference position relative to the time domain position of the second communication device sending the first message, and the time offset corresponding to the first sending time information is t ₁ = T _1- T ₀ ; the first reception time information is the offset of the second time domain reference position relative to the time domain position at which the first communication device receives the first message, and the first reception time information The corresponding time offset is t′ ₁ =T′ ₁ -T′ ₀ . The fourth transmission time information is the offset of the second time domain reference position relative to the time domain position of the first communication device sending the fourth message, and the time offset corresponding to the fourth transmission time information is t ₄ = T ₄ -T′ ₀ ; the fourth receiving time information is the offset of the first time domain reference position relative to the time domain position of the second message received by the second communication device, and the fourth receiving time information corresponds to offset time _{_{t '4 = T' 4 -T}} 0.

The first communication device is based on

Obtain the first time offset, where A is the first time offset.

The first communication device is based on

Obtain the first reference offset, where B is the first reference offset.

[Example 11]

As shown in FIG. 17, the second communication device sends a first message, and the first communication device receives the first message sent by the second communication device, where the time domain position corresponding to the first message received by the first communication device corresponds Is T′ ₁ , and the time corresponding to the time domain position at which the second communication device sends the first message is T ₁ .

The first communication device sends a fourth message, where the time corresponding to the time domain position at which the first communication device sends the fourth message is T ₄ . The second communication device receives the fourth message sent by the first communication device, and the time corresponding to the time domain position where the second communication device receives the fourth message is T′ ₄ .

The first communication device is based on

Obtain the first time offset, where A is the first time offset.

The first communication device is based on

Obtain the first reference offset, where B is the first reference offset.

[Example 12]

The first communication device determines a second time domain reference position, and the time corresponding to the second time domain reference position is T′ ₀ . The first communication device acquires first reception time information, where the first reception time information is an offset of the second time-domain reference position relative to the time-domain position at which the first communication device receives the first message, that is, the first The time offset corresponding to the received time information is T′ ₁ -T′ ₀ .

The second communication device determines a first time domain reference position, and the time corresponding to the first time domain reference position is T ₀ . The second communication device sends first transmission time information to the first communication device, where the first transmission time information is a deviation of the first time domain reference position relative to the time domain position of the second communication device sending the first message The shift amount, that is, the time offset corresponding to the first transmission time information is T ₁ -T ₀ . The first communication device obtains the first transmission time information.

The first communication device obtains fourth transmission time information, where the fourth transmission time information is an offset of the second time-domain reference position relative to the time-domain position at which the first communication device sends the fourth message, that is, the first 4. The time offset corresponding to the transmitted time information is T ₄ -T′ ₀ .

The second communication device sends fourth reception time information to the first communication device, where the fourth reception time information is the reference position of the first time domain relative to the time domain position of the fourth message received by the second communication device The offset, that is, the time offset corresponding to the fourth received time information is T′ ₄ -T ₀ . The first communication device acquires the fourth reception time information.

The first communication device acquires first transmission time information, first reception time information, first transmission time information, and first reception time information. Wherein, the first sending time information is an offset of the first time domain reference position relative to the time domain position of the second communication device sending the first message, and the time offset corresponding to the first sending time information is t ₁ =T ₁ -T ₀ ; the first reception time information is the offset of the second time domain reference position relative to the time domain position at which the first communication device receives the first message, the first reception time The time offset corresponding to the information is t′ ₁ =T′ ₁ -T′ ₀ . The fourth sending time information is an offset of the second time domain reference position relative to the time domain position of the first communication device sending the fourth message, and the time offset corresponding to the fourth sending time information is t ₄ =T ₄ -T′ ₀ ; the fourth reception time information is the offset of the first time domain reference position relative to the time domain position where the second communication device receives the fourth message, and the fourth reception time information The corresponding time offset is t′ ₄ =T′ ₄ -T ₀ .

The first communication device is based on

Obtain the first time offset, where A is the first time offset.

The first communication device is based on

Obtain the first reference offset, where B is the first reference offset.

In the embodiment of the present application, in the case where the clock of the first communication device and the clock of the second communication device are inconsistent, the first communication device according to the first transmission time information, the first reception time information, the first Four transmission time information and the fourth reception time information, and acquiring the first time offset can offset the synchronization error caused by the inconsistency between the clock of the first communication device and the clock of the second communication device. The time offset is more precise.

1801. The first communication device sends a sixth message. Correspondingly, the second communication device receives the sixth message sent by the first communication device.

Optionally, the first communication device may periodically send the sixth message. For example, the first communication device sends the sixth message every 1 ms, or sends the sixth message every 20 ms.

Optionally, the first communication device may trigger sending the sixth message according to the configuration. Taking the triggering of sending the sixth message according to the configuration as an example, one way is that the first communication device can trigger the first communication device to send the sixth message according to whether a trigger signal of another communication device is received; another way Yes, the first communication device may trigger the first communication device to periodically send the sixth message according to whether a trigger signal of another communication device is received, for example, the first communication device may use a pre-configured The sixth message is sent every 2 radio frames, or every 20 ms. Optionally, the triggered periodic transmission may end the periodic transmission according to the configuration, or a trigger signal, or a predefined parameter. For example, after the first communication device sends the sixth message every 20 ms, it receives Trigger signal sent periodically; the first communication device ends sending the sixth message; or, the first communication device sends the sixth message every 20ms within 80ms, and the first communication device stops sending the sixth message after 80ms news. The triggering sending according to the configuration further includes that the first communication device measures the signal sent by the second communication device to obtain synchronization error information; if the synchronization error exceeds a given threshold, the first communication device triggers sending the sixth message.

Optionally, the sixth message may be an uplink trigger signal (such as a random access preamble Preamble, a signal carrying Msg.1), an SS/PBCH block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal (demodulation At least one of reference (signal, DMRS) and channel quality measurement reference symbol (channel-state information-reference signal (CSI-RS).

Optionally, the second communication device sends a sixth resource message, where the sixth resource message is used to indicate resources used by the first communication device to send the sixth message, and the resources of the sixth message include time domain resources and frequency. At least one of a domain resource and a code domain resource. Correspondingly, the first communication device receives the sixth resource message sent by the second communication device, and the first communication device sends the sixth message, including: the first communication device sends the sixth resource message according to the sixth resource message news. In other words, the second communication device may indicate the resource used by the first communication device to send the sixth message, and the first communication device sends the sixth message on the resource indicated by the second communication device. Taking time-frequency resources as an example, the second communication device sends a sixth resource message 1, and the sixth resource message 1 indicates time-domain and/or frequency-domain resources used by the first communication device to send the sixth message, for example: {Time unit 1, band range 1}, or {time unit 2, band range 2}; further, the first communication device according to the sixth resource message 1, time unit 1, band range in the indicated resource The sixth message is sent on 1. For another example, the second communication device sends a sixth resource message 2 indicating the time domain position of the OFDM symbol in the time slot occupied by the first communication device, such as the time domain of the OFDM symbol where the message is received The location, or, the time-domain location of the OFDM symbol where the message is sent, or not limited to the time-domain location of the OFDM symbol received or transmitted.

1802. The first communication device obtains sixth transmission time information, where the sixth transmission time information is used to indicate the time when the first communication device sends the sixth message.

Optionally, the sixth sending time information may be information indicating the time when the first communication device sends the sixth message.

In an example, the sixth sending time information may be the sending time of the sixth message, that is, the time when the first communication device sends the sixth message, for example, 10 hours, 0 minutes, and 0 seconds.

In an example, the sixth sending time information may be a relative sending time period of the sixth message, that is, a time when the first communication device sends the sixth message is relative to a reference time period, for example, 1 ms.

In an example, the sixth sending time information may be time domain position information of the sixth message. For example, the sixth transmission time information may be the radio frame number of the resource where the sixth message is located.

In an example, the sixth sending time information may be an offset of the time domain position of the resource where the sixth message is located relative to the time domain reference position, for example, 10 radio frame intervals after the fifth radio frame .

In an example, the sixth transmission time information may be information related to time domain position information of the sixth message, such as frequency domain position information and code domain position information of the sixth message.

1803. The second communication device sends sixth reception time information, where the sixth reception time information is used to indicate the time when the second communication device receives the sixth message. Correspondingly, the first communication device obtains sixth reception time information.

Optionally, the sixth reception time information may be information indicating the time when the second communication device receives the sixth message.

In an example, the sixth reception time information may be the reception time of the sixth message, that is, the time when the second communication device receives the sixth message, for example, 10 hours, 0 minutes, and 0 seconds.

In an example, the sixth reception time information may be a relative reception time period of the sixth message, that is, a time when the second communication device receives the sixth message relative to a reference time period, for example, 1 ms.

In an example, the sixth reception time information may be time domain location information of the sixth message. For example, the sixth reception time information may be the radio frame number of the resource where the sixth message is located.

In an example, the sixth reception time information may be an offset of the time domain position of the resource where the sixth message is located relative to the time domain reference position, for example, 10 radio frame intervals after the fifth radio frame .

In an example, the sixth reception time information may be information related to time domain position information of the sixth message, such as frequency domain position information and code domain position information of the sixth message.

1804, the first communication device obtains a second time offset according to the sixth transmission time information and the sixth reception time information.

In other words, the first communication device can process any form of sixth transmission time information and any form of sixth reception time information to obtain the second time offset. The sixth sending time information includes, at least one of the sending time of the sixth message, or the relative sending time period relative to the reference, or the time domain position on the time domain resource, which is not limited here; the sixth The reception time information includes at least one of the reception time of the sixth message, or a relative reception time period relative to the reference, or a time domain position on the time domain resource, which is not limited herein.

Optionally, the second time offset may be an air interface transmission delay, that is, the sixth message is air interface signaling, and the second time offset is the sixth message from the second communication device to the first Transmission delay of communication equipment.

Optionally, the second time offset may be any form for indicating a time offset between the time when the second communication device sends the sixth message and the time when the first communication device receives the sixth message Information. For example, the second time offset may indicate a time offset between the time when the second communication device sends the sixth message and the time when the first communication device receives the sixth message, such as 1s. As another example, there are 5 subframes at intervals.

Optionally, the second time offset may be used to instruct the first communication device to send other messages in advance. In other words, the first communication device may send ahead by a time offset when sending the message next time, and the one time offset matches the second time offset. For example, the second time offset is 64 unit times, and the first communication device may send a message in advance 64 unit times according to the second time offset, so that the message can be Received by the second communication device in the time domain.

Optionally, the second communication device sends a cell ID to the first communication device. Correspondingly, the first communication device receives the cell ID sent by the second communication device, and obtains the correspondence between the second time offset and the cell ID. In other words, the first communication device may count the second time offset corresponding to each cell ID sent by the second communication device, and the first communication device may send a message to the corresponding cell next time according to The message is sent in advance by the second time offset corresponding to the cell ID. In addition, different cells only synchronize according to the cell closest to them without acquiring global synchronization information, which can reduce the overhead of synchronization signaling.

Optionally, the sixth message sent by the first communication device to multiple cells acquires multiple second time offsets corresponding to the multiple cells. In other words, the first communication device sends a sixth message to multiple cells to obtain sixth transmission time information and sixth reception time information corresponding to multiple cells, thereby obtaining multiple second times corresponding to multiple cells Offset. The first communication device can thus count the second time offset corresponding to each of the multiple cells, and send a message to the corresponding cell in advance according to the second time offset; or, the first communication device can obtain The multiple second time offsets are broadcast to multiple cells for synchronization with multiple cells to achieve high-precision collaboration.

Optionally, the second communication device receives the sixth message sent by the first communication device, the third communication device receives the sixth message sent by the second communication device, or the second communication device receives the eleventh message sent by the third communication device Message, the first communication device may obtain sixth transmission time information and sixth reception time information, thereby obtaining a second time offset; the second communication device may obtain eleventh transmission time information and eleventh reception time information So that the first communication device can acquire the eleventh time offset, the eleventh sending time information is used to indicate the time when the eleventh message is sent, and the eleventh receiving time information is used to indicate that the tenth is received The time of a message and the eleventh time offset can be obtained through the eleventh sending time information and the eleventh receiving time information. The first communication device may acquire the synchronization error between the first communication device and the third communication device according to the second time offset and the eleventh time offset. In other words, the first communication device acquires the first communication device and the third communication device through the synchronization error between the first communication device and the second communication device, and the synchronization error between the second communication device and the third communication device Synchronization error. Therefore, the first communication device may send a message to the third communication device in advance according to the second time offset and the eleventh time offset; or, maintain accurate synchronization with the second communication device and the third communication device For high-precision collaboration. The method for synchronizing the first communication device with the second communication device and the third communication device can be further used for synchronization between more communication devices, which will not be repeated here.

Optionally, the first communication device sends a ninth message to the second communication device, where the ninth message carries information indicating the second time offset. Correspondingly, the second communication device receives the ninth message sent by the first communication device. That is, the second communication device is acquiring the second time offset sent by the first communication device, and the second communication device can synchronize with the first communication device according to the second time offset.

Optionally, the second time offset may be used to instruct the second communication device to send other messages in advance. In other words, the second communication device may send in advance by a time offset when sending the message next time, and the one time offset matches the second time offset.

Optionally, the first communication device may send a cell ID to the second communication device. Correspondingly, the second communication device receives the cell ID sent by the first communication device, and obtains the correspondence between the second time offset and the cell ID. In other words, the second communication device can count the second time offset corresponding to each cell ID sent by the first communication device, and the second communication device can send the message to the corresponding cell next time according to The message is sent in advance by the second time offset corresponding to the cell ID. In addition, different cells only synchronize according to the cell closest to them without acquiring global synchronization information, which can reduce the overhead of synchronization signaling.

[Example 13]

As shown in FIG. 19, the first communication device sends a sixth message, and the second communication device receives the sixth message sent by the first communication device, where the time when the first communication device sends the sixth message is T ₆ , the first The moment when the second communication device receives the sixth message is T′ ₆ .

The second communication device acquires sixth transmission time information T ₆ and sixth reception time information T′ ₆ , and obtains the second time offset according to the sixth transmission time information T ₆ and the sixth reception time information T′ ₆ Amount C, where C is the second time offset.

Optionally, obtaining the second time offset C according to the time information T ₆ and the time information T′ ₆ specifically includes that the first time offset C satisfies: C=T′ ₆ -T ₆ .

In 2001, the first communication device sent a sixth message. Correspondingly, the second communication device receives the sixth message sent by the first communication device.

In 2002, the first communication device acquires sixth transmission time information, where the sixth transmission time information is an offset of the third time-domain reference position relative to the time-domain position at which the first communication device sends the sixth message.

In 2003, the second communication device sent sixth reception time information, and the sixth reception time information was used to indicate the time when the second communication device received the sixth message. Correspondingly, the first communication device obtains the sixth reception time information.

For specific implementation of steps 2001 to 2003, reference may be made to steps 1801 to 1803 in the embodiment shown in FIG. 18, and details are not described here.

In 2004, the first communication device acquired a second reference offset, where the second reference offset was the time offset between the third reference and the fourth reference, and the third reference was the For reference, the fourth reference is a reference of the second communication device.

The third reference is a reference of the first communication device, which means that the first communication can refer to the third reference to determine the time when the first communication device sends the sixth message. In other words, the third reference may be any reference that the first communication device determines when the first communication device sends the sixth message. The third reference may be set randomly, or may be predefined or configured. In one example, the third reference may be a time, for example, 9 hours, 0 minutes, and 0 seconds. In one example, the third reference may be a time domain position, for example, a time domain start position of an even-numbered radio frame. In one example, the third reference may be the time indicated by the clock of the first communication device.

The fourth reference is a reference of the second communication device, which means that the second communication can refer to the fourth reference to determine the time when the second communication device receives the sixth message. In other words, the fourth reference may be any reference that the second communication device determines when the second communication device received the sixth message. The fourth reference may be set randomly, or may be predefined or configured. In one example, the fourth reference may be a time, for example, 10 hours, 0 minutes, and 0 seconds. In one example, the fourth reference may be a time domain position, for example, a time domain start position of an even-numbered wireless frame. In one example, the fourth reference may be the time indicated by the clock of the second communication device.

The second reference offset may be information indicating the time offset between any form of reference and any form of reference.

Optionally, the second reference offset may be a specific time period.

In one example, the second reference offset may be a time offset between time and time. For example, the fourth reference is 10 hours, 0 minutes and 0 seconds, the third reference is 9 hours, 0 minutes and 0 seconds, and the second reference offset is 1 hour.

In one example, the second reference offset may be a time offset between the time domain position and the time. For example, the fourth reference is the upper border of the fifth radio frame, and the third reference is 10 hours, 0 minutes, and 0 seconds. The second communication device may correspond to the upper border of the fifth radio frame with the time. The upper edge of the radio frame corresponds to 9:0:0, and the second reference offset is 1:0:0:0.

In one example, the second reference offset may be a clock-to-clock time offset. For example, the fourth reference is the clock of the second communication device, and the third reference is the clock of the first communication device. The clock of the first communication device is 1 second faster than the clock of the second communication device. The second reference offset is 1 second.

In one example, the second reference offset may be a time offset between the time domain position and the time domain position. For example, the fourth reference is the upper border of the fifth radio frame, the third reference is the upper border of the fourth radio frame, and the second reference offset is 1 radio frame interval.

There are many ways for the first communication device to obtain the second reference offset, for example, the second communication device sends another message to obtain the aligned third reference and the fourth reference, and the sixth transmission time information is used And the sixth reception time information, obtain the second reference offset. For specific methods, refer to the embodiments of FIG. 22 and FIG. 27, and details are not described here.

In 2005, the first communication device acquires the second time offset according to the sixth transmission time information, the sixth reception time information, and the second reference offset.

In an example, the first communication device may deduct the second reference offset from the difference between the sixth reception time information and the sixth transmission time information to obtain the second time offset. For example, the first communication device determines that the time when the first communication device sends the sixth message is 10:0:0, and the time when the second communication device receives the sixth message is 10:0:0: The clock of the second communication device is one hour later than the clock of the first communication device, then the second reference offset is 1 hour, and the first communication device may determine that the second time offset is 1 hour.

In one example, the first communication device may align the reference of the first communication device with the reference of the second communication device according to the second reference offset, and acquire the after the alignment of the first reference and the second reference For the sixth transmission time information and the sixth reception time information, obtain the second time offset according to the sixth transmission time information and the sixth reception time information after aligning the first reference and the second reference. For example, if the clock of the second communication device is one hour later than the clock of the first communication device, the second communication device determines that the time when the second communication device receives the sixth message is 11 hours, 0 minutes, and 0 seconds, then the The second reference offset is 1 hour, the first communication device may align the clock of the first communication device with the clock of the second communication device, and determine that the time when the first communication device sends the sixth message is 10 o'clock 0 minutes 0 seconds, then the first communication device may determine that the second time offset is 1 hour.

For a specific implementation manner of step 2005, reference may be made to step 1804 in the embodiment shown in FIG. 18, and details are not described here.

[Example 14]

As shown in FIG. 21, the first communication device sends a sixth message, and the second communication device receives the sixth message sent by the first communication device, where the time domain position corresponding to the sixth message received by the second communication device corresponds Is T′ ₆ , and the time corresponding to the time domain position at which the first communication device sends the sixth message is T ₆ .

The first communication device determines a third time domain reference position, and the time corresponding to the third time domain reference position is t ₀ . The first communication device acquires sixth transmission time information, where the sixth transmission time information is an offset of the third time domain reference position relative to the time domain position at which the first communication device sends the sixth message, that is, the sixth The time offset corresponding to the transmission time information is t ₆ =T ₆ -T ₀ .

The second communication device determines a fourth time domain reference position, and the time corresponding to the fourth time domain reference position is

The second communication device acquires sixth reception time information, where the sixth reception time information is an offset of the fourth time domain reference position relative to the time domain position at which the second communication device receives the sixth message, that is, the first six time offset corresponding to the reception time information of _{_{t '6 = T' 6 -T}} '0. The first communication device obtains the sixth reception time information.

The second communication device acquires a second reference offset, which is a time offset D=T ₆ -T′ ₆ between the third time domain reference position and the fourth time domain reference position.

The second communication device obtains the second time offset according to C=t′ ₆ -t ₆ -D, where C is the second time offset.

In the embodiment of the present application, in the case where the third time domain reference position is inconsistent with the fourth time domain reference position (for example, the clock of the second communication device is inconsistent with the clock of the first communication device), only The second time offset obtained by the sixth transmission time information and the sixth reception time information is inaccurate. On the one hand, the second time offset obtained is more accurate by combining the sixth sending time information, the sixth receiving time information, and the second reference offset; on the other hand, in the third time domain reference position In the case where the fourth time domain reference position does not change, repeatedly using the second reference offset can reduce the signaling overhead of acquiring the second time offset.

2201. The second communication device sends a seventh message. Correspondingly, the first communication device receives the seventh message sent by the second communication device.

Optionally, the second communication device may periodically send the seventh message. For example, the second communication device sends the seventh message every 2 ms, or sends the seventh message every 20 ms.

Optionally, the second communication device may trigger or trigger the sending of the seventh message according to the configuration. Taking the triggering of sending the seventh message according to the configuration as an example, one way is that the second communication device can trigger the second communication device to send the seventh message according to whether a trigger signal of another communication device is received; another way Yes, the second communication device may trigger the second communication device to periodically send the seventh message according to whether a trigger signal of another communication device is received, for example, the second communication device may use a pre-configured The seventh message is sent every 2 radio frames, or every 20 ms. Optionally, the triggered periodic transmission may end the periodic transmission according to the configuration, or a trigger signal, or a predefined parameter. For example, after the second communication device sends the seventh message every 20 ms, it receives the end Trigger signal sent periodically; the second communication device ends sending the seventh message; or, the second communication device sends the seventh message every 20ms within 80ms, and the second communication device stops sending the seventh message after 80ms news. The triggering sending according to the configuration further includes that the first communication device measures the signal sent by the second communication device to obtain synchronization error information; if the synchronization error exceeds a given threshold, the first communication device triggers sending the seventh message.

Optionally, the seventh message may be an uplink trigger signal (such as a random access preamble Preamble, a signal carrying Msg.1), SS/PBCH block, primary synchronization signal, secondary synchronization signal, and channel demodulation reference signal (demodulation Reference (signal, DM-RS), at least one of channel quality measurement reference symbols (channel-state information-reference, signal (CSI-RS).

Optionally, the manner in which the first communication device receives the seventh message may be that the first communication device detects the resource that the second communication device sends the seventh message. The resources that the second communication device sends the seventh message may include at least one of time domain resources, frequency domain resources, and code domain resources. For example, the first communication device detects the seventh message on the time unit 1, where the time unit may be a time slot, subframe, mini-slot, or OFDM symbol. For another example, the first communication device detects the seventh message on frequency band 1. For another example, the first communication device generates a sequence 1 of the seventh message, and detects the first message according to the generated sequence 1. This embodiment of the present application is not limited thereto.

Optionally, the first communication device sends a seventh resource message, where the seventh resource message is used to indicate the resource used by the second communication device to send the seventh message. The resource of the seventh message includes time domain resources and frequency. At least one of a domain resource and a code domain resource. Correspondingly, the second communication device receives the seventh resource message sent by the first communication device, and the second communication device sends the seventh message, including: the second communication device sends the seventh resource message according to the seventh resource message news. In other words, the first communication device may indicate the resource used by the second communication device to send the seventh message, and the second communication device sends the seventh message on the resource indicated by the first communication device. Taking time-frequency resources as an example, the first communication device sends a seventh resource message 1, and the seventh resource message 1 indicates the time-domain and/or frequency-domain resources used by the second communication device to send the seventh message, for example: {Time unit 1, band range 1}, or {time unit 2, band range 2}; further, the second communication device according to the seventh resource message 1, time unit 1, band range in the indicated resource 1. The seventh message is sent. For another example, the first communication device sends a seventh resource message 2, which indicates the time domain position of the OFDM symbol in the time slot occupied by the second communication device, such as the time domain of the OFDM symbol where the message is received The location, or, the time-domain location of the OFDM symbol where the message is sent, or not limited to the time-domain location of the OFDM symbol received or transmitted.

2202. The second communication device obtains a fourth time-domain reference position.

The fourth time domain reference location may be the location of time domain resources or other resources related to time domain resources. For example, the start position of the even-numbered radio frame in the time domain. As another example, the frequency band 1 related to the time domain position.

Optionally, the second communication device may determine the fourth time domain reference position. For example, the second communication device may use a time domain starting position of each radio frame as a time domain reference position, and multiple time slots after the fourth time domain reference position all refer to the fourth time domain reference position. For another example, the second communication device may use the starting position of the radio frame where the seventh message is located as the fourth time-domain reference position.

Optionally, the fourth time domain reference location may be the time domain location where the second communication device sends the seventh message. For example, the fourth time domain reference position may be the time domain starting position of the radio frame where the seventh message is located.

2203. The first communication device acquires the third time-domain reference position according to the time-domain position of the seventh message received by the first communication device.

The third time domain reference location may be the location of time domain resources or other resources related to time domain resources. For example, the start position of the even-numbered radio frame in the time domain. As another example, the frequency band 1 related to the time domain position.

Optionally, before the first communication device obtains a third time-domain reference position according to the time-domain position of the seventh message received by the first communication device, the method further includes: the first communication The device obtains a seventh sending time, where the seventh sending time is an offset of the fourth time-domain reference position relative to the time-domain position at which the second communication device sends the seventh message; the first communication The device acquiring the third time domain reference position according to the time domain position of the first communication device receiving the seventh message includes: the first communication device receives the seventh message according to the first communication device Obtain the third time-domain reference position and the seventh time-domain position.

In other words, the first communication device acquires the time offset of the time domain position of the second communication device sending the seventh message relative to the fourth time domain reference position of the second communication device, that is, the seventh transmission time, the The first communication device advances the offset corresponding to the seventh transmission time forward or backward from the time domain position of the seventh message received by the first communication device, to obtain the third time domain reference position. The first communication device may align the fourth time domain reference position of the second communication device with the third time domain reference position, and the time domain position of the seventh message sent by the second communication device relative to the fourth time domain The time offset of the reference position is the same as the time offset of the time domain position of the seventh message received by the first communication device relative to the third time domain reference position. For example, if the fourth time domain reference position is the 10th frame and the second communication device sends the seventh message the time domain position is the 11th frame, then the seventh transmission time is an interval of 1 frame; the first communication device The time domain position where the seventh message is received is the 16th frame, and the first communication device may determine the third time domain reference position as the 15th frame according to the seventh transmission time.

Optionally, the first communication device may obtain the seventh sending time according to an instruction of the second communication device. For example, the first communication device may receive a message sent by the second communication device, the message carries the seventh transmission time, and the first communication device may obtain the seventh transmission time from the message.

Optionally, the seventh message carries the seventh sending time; obtaining the seventh sending time by the first communication device includes: the first communication device acquiring the first sending time carried by the seventh message Seven sending time. For example, the first communication device parses the seventh message to obtain the seventh sending time.

Optionally, before the first communication device obtains the seventh transmission time, the method further includes: the first communication device receives a sixth time message sent by the second communication device, and the sixth time message Carrying the seventh sending time; acquiring the seventh sending time by the first communication device includes: the first communication device acquiring the seventh sending time carried by the sixth time message. For example, the first communication device parses the sixth time message to obtain the seventh transmission time.

Optionally, the first communication device may not receive instructions from other devices and determine the seventh sending time. For example, the seventh transmission time is predefined or the first communication device is configured to the second communication device, and the first communication device can determine the seventh transmission time without acquiring indication information of other devices.

Optionally, the first communication device acquiring the seventh transmission time includes: the first communication device determining the resource of the seventh message; and the first communication device acquiring the data according to the resource of the seventh message In the seventh sending time, the resources of the seventh message include at least one of time domain resources, frequency domain resources, and code domain resources. In other words, the first communication device may detect the resource of the seventh message, and determine the seventh transmission time according to the relationship between the resource of the seventh message and the seventh transmission time. Taking time-frequency resources as an example, the first communication device may pre-configure a seventh transmission time 1 corresponding to the time-frequency resource 1 and a seventh transmission time 2 corresponding to the time-frequency resource 2, if the first communication device is at this time If the seventh message is detected on frequency resource 1, the seventh sending time is the seventh sending time 1.

Optionally, the first communication device may use the seventh configuration time according to the pre-configuration information. For example, the seventh message is pre-configured to be sent in a given time slot within an even-numbered wireless frame, and the first communication device may obtain the seventh sending time without receiving instructions from other devices.

Optionally, the first communication device sends a second time message, where the second time message is used to indicate the seventh sending time. The second communication device receives the second time message sent by the first communication device; the second communication device sends a seventh message, including: the second communication device sends the seventh message according to the seventh sending time. In other words, the second communication device may send the seventh message according to the transmission time indicated by the first communication device. For example, the first communication device may specify the second communication device to send the seventh message in a given time slot within an even radio frame through the seventh message, or the second communication device may send the For the seventh message, the first communication device may send the seventh message in a given time slot in an even-numbered wireless frame according to the indication of the seventh message, or send the seventh message at 10:00 am and 0 seconds.

Optionally, the third time domain reference location may be the time domain location where the first communication device receives the seventh message. For example, the third time domain reference position may be the upper border of the time domain resource where the seventh message is located.

2204, the first communication device sends a sixth message. Correspondingly, the second communication device receives the sixth message sent by the first communication device.

Optionally, the first communication device may send the sixth message before receiving the seventh message.

Correspondingly, the second communication device may send the seventh message after receiving the sixth message.

2205. The first communication device obtains sixth transmission time information, where the sixth transmission time information is used to indicate the time when the first communication device sends the sixth message.

For specific implementation of steps 2204 to 2205, reference may be made to steps 1801 to 1802 in the embodiment shown in FIG. 18, and details are not described here.

2206. The second communication device sends sixth reception time information, where the sixth reception time information is an offset of the fourth time-domain reference position relative to the time-domain position of the sixth message received by the second communication device. Correspondingly, the first communication device obtains the sixth reception time information.

The offset of the fourth time domain reference position relative to the time domain position at which the second communication device receives the sixth message may have various forms; it may be an offset in the sense of time, for example, 64 unit times ; It can also be the offset of the time domain position, for example, 5 subframe intervals; it can also be other offsets used to represent the time offset, such as the offset of the frequency domain resource related to the time domain position.

2207. The first communication device obtains a second time offset according to the sixth transmission time information and the sixth reception time information.

In other words, the first communication device may offset the time domain position of the seventh message from the fourth time domain position in any form of the second communication device and the sixth reception time information in any form Perform processing to obtain the second time offset. For example, the sixth reception time information is the interval of 1 radio frame, the sixth transmission time information may be the 20th radio frame, the third reference time domain position is the 18th radio frame, and the second time offset It is 0.5 radio frames. For another example, the sixth transmission time information is 1s, the sixth reception time information is 2s, and the second time offset is 0.5s.

Optionally, the second time offset may be an air interface transmission delay, that is, the seventh message and the sixth message are both air interface signaling, and the second time offset is the sixth message from the first The transmission delay from the communication device to the second communication device.

Optionally, the second time offset meets:

Since the third time domain reference position and the fourth time domain reference position have been aligned, the formula

The time offset between the third time-domain reference position and the fourth time-domain reference position may be offset.

Optionally, when the time at which the second communication device sends the seventh message is the same as the time offset at which the first communication device receives the seventh message and the second time offset, K is 2. In other words, the time offset between the third time domain reference position and the fourth time domain reference position is the same as the second time offset value.

Optionally, the first communication device obtains a second reference offset according to the sixth transmission time information and the sixth reception time information, where the second reference offset is the third time domain reference position and the first The time offset of the four-time reference position.

Optionally, the second reference offset meets:

In other words, in order to align the time offset required by the third time-domain reference position and the fourth time-domain reference position, a formula can be used

inferred.

Optionally, when the time at which the second communication device sends the seventh message is the same as the value of the time offset at which the first communication device receives the seventh message and the value of the second time offset, K is 2 . In other words, the second reference offset is the same as the first time offset value.

Optionally, after the first communication device acquires the second reference offset, the second reference offset may be applied. For example, the next time the first communication device sends the sixth message, it may obtain the second time offset according to the time when the sixth message is sent, the time when the sixth message is received, and the second reference offset. For a specific implementation manner, reference may be made to step 2005 in the embodiment shown in FIG. 5, and details are not described here.

Optionally, the second time offset may be used to instruct the first communication device to send other messages in advance. In other words, the first communication device may send in advance by a time offset when sending the message next time, and the one time offset matches the second time offset. For example, the second time offset is 64 unit times, and the first communication device may send a message in advance 64 unit times according to the second time offset, so that the message can be Received by the second communication device in the time domain.

Optionally, the first communication device sends a ninth message to the second communication device, where the ninth message carries information indicating the second time offset and/or the second reference offset. Correspondingly, the second communication device receives the ninth message sent by the first communication device, and obtains information about the second time offset and/or the second reference offset. That is to say, the second communication device is acquiring the second time offset and/or the second reference offset sent by the first communication device, the second communication device may be based on the second time offset The amount is synchronized with the first communication device.

[Example 15]

As shown in FIG. 23, the second communication device sends a seventh message, where the time corresponding to the time domain position at which the second communication device sends the seventh message is T ₇ . The first communication device receives the seventh message sent by the second communication device, and the time corresponding to the time domain position at which the first communication device receives the seventh message is T′ ₇ . The second communications device determines a fourth time-domain reference position, the reference time of the fourth temporal position corresponding to t _'0. The first communication device sends a seventh transmission time to the first communication device, where the seventh transmission time is an offset of the fourth time-domain reference position relative to the time-domain position at which the second communication device sends the seventh message, That is, the time offset corresponding to the seventh transmission time is T ₇ -t' ₀ . The first communication device obtains the seventh transmission time sent by the second communication device, advances the time offset of T ₇ -t' ₀ from time T′ _{7 to} obtain the third time domain reference position, the third The time corresponding to the time-domain reference position is t ₀ .

The first communication device sends a sixth message, and the second communication device receives the sixth message sent by the first communication device, where the time corresponding to the time domain position at which the second communication device receives the sixth message is T′ _6. The time corresponding to the time domain position at which the first communication device sends the sixth message is T ₆ .

The second communication device acquires sixth transmission time information and sixth reception time information; where the sixth transmission time information is the deviation of the third time domain reference position relative to the time domain position of the first communication device sending the sixth message Shift amount, the time offset corresponding to the sixth transmission time information is t ₆ =T ₆ -t ₀ ; the sixth reception time information is the fourth time domain reference position relative to the second communication device receiving the first offset six temporal location message, the sixth reception time information corresponding to the offset time is _{_{t '6 = T' 6 -t}} '0.

The first communication device is based on

Obtain the second time offset, where C is the second time offset.

The first communication device is based on

Obtain the second reference offset, where D is the second reference offset.

[Example 16]

As shown in FIG. 24, the first communication device sends a sixth message, and the second communication device receives the sixth message sent by the first communication device, where the time domain location corresponding to the sixth message received by the second communication device corresponds Is T′ ₆ , and the time corresponding to the time domain position at which the first communication device sends the sixth message is T ₆ .

The second communication device sends a seventh message, where the time corresponding to the time domain position at which the second communication device sends the seventh message is T ₇ . The first communication device receives the seventh message sent by the second communication device, and the time corresponding to the time domain position at which the first communication device receives the seventh message is T′ ₇ . The second communications device determines a fourth time-domain reference position, the reference time of the fourth temporal position corresponding to t _'0. The first communication device sends a seventh transmission time to the first communication device, where the seventh transmission time is an offset of the fourth time-domain reference position relative to the time-domain position at which the second communication device sends the seventh message, That is, the time offset corresponding to the seventh transmission time is T ₇ -t' ₀ . The first communication device obtains the seventh transmission time sent by the second communication device, advances the time offset of T ₇ -t' ₀ from time T′ _{7 to} obtain the third time domain reference position, and the third The time corresponding to the time-domain reference position is t ₀ .

The first communication device is based on

Obtain the second time offset, where C is the second time offset.

The first communication device is based on

Obtain the second reference offset, where D is the second reference offset.

[Example 17]

As shown in FIG. 25, the second communication device sends a seventh message, where the time corresponding to the time domain position at which the second communication device sends the seventh message is T ₇ . The first communication device receives the seventh message sent by the second communication device, and the time corresponding to the time domain position at which the first communication device receives the seventh message is T′ ₇ . The first communication device determines that the third time domain reference position is the time domain position where the first communication device receives the seventh message, and the time corresponding to the third time domain reference position is t ₀ . The second communication device obtains the time domain reference position for the fourth time domain location of the second communication device transmits the message of the seventh, and the fourth time domain reference position corresponding to the time t _'0.

The first communication device acquires sixth transmission time information and sixth reception time information; where the sixth transmission time information is a deviation of the third time domain reference position relative to the time domain position of the first communication device sending the sixth message Shift amount, the time offset corresponding to the sixth transmission time information is t ₆ =T ₆ -t ₀ ; the sixth reception time information is the fourth time domain reference position relative to the second communication device receiving the first offset six temporal location message, the sixth reception time information corresponding to the offset time is _{_{t '6 = T' 6 -t}} '0.

The first communication device is based on

Obtain the second time offset, where C is the second time offset.

The first communication device is based on

Obtain the second reference offset, where D is the second reference offset.

[Example 18]

As shown in FIG. 26, the first communication device sends a sixth message, and the second communication device receives the sixth message sent by the first communication device, where the time domain position corresponding to the sixth message received by the second communication device corresponds Is T′ ₆ , and the time corresponding to the time domain position at which the first communication device sends the sixth message is T ₆ .

The second communication device sends a seventh message, where the time corresponding to the time domain position at which the second communication device sends the seventh message is T ₇ . The first communication device receives the seventh message sent by the second communication device, and the time corresponding to the time domain position at which the first communication device receives the seventh message is T′ ₇ . The first communication device determines that the third time domain reference position is the time domain position where the first communication device receives the seventh message, and the time corresponding to the third time domain reference position is t ₀ . The second communication device obtains the time domain reference position for the fourth time domain location of the second communication device transmits the message of the seventh, and the fourth time domain reference position corresponding to the time t _'0.

The first communication device is based on

Obtain the second time offset, where C is the second time offset.

The first communication device is based on

Obtain the second reference offset, where D is the second reference offset.

2701. The first communication device acquires a third time-domain reference position.

2702, the second communication device sends an eighth message. Correspondingly, the first communication device receives the eighth message sent by the second communication device.

Optionally, the first communication device may determine the third time domain reference position. For example, the first communication device may use a time domain starting position of each radio frame as a time domain reference position, and multiple time slots after the third time domain reference position all refer to the third time domain reference position. For another example, the first communication device may use the vicinity of the starting position of the radio frame where the eighth message is located as the third time-domain reference position.

Optionally, the second communication device may periodically send the eighth message. For example, the second communication device sends the eighth message every 2 ms, or sends the eighth message every 20 ms.

Optionally, the second communication device may trigger or trigger the sending of the eighth message according to the configuration. Taking the configuration of triggering sending the eighth message as an example, one way is that the second communication device can trigger the second communication device to send the eighth message according to whether a trigger signal of another communication device is received; another way Yes, the second communication device may trigger the second communication device to periodically send the eighth message according to whether a trigger signal of another communication device is received, for example, the second communication device may use a pre-configured The eighth message is sent every 2 radio frames, or every 20 ms. Optionally, the triggered periodic transmission may end the periodic transmission according to the configuration, or a trigger signal, or a predefined parameter. For example, after the second communication device sends the eighth message every 20 ms, it receives Trigger signal sent periodically; the second communication device ends sending the eighth message; or, the second communication device sends the eighth message every 20ms within 80ms, and the second communication device stops sending the eighth message after 80ms news. The triggering sending according to the configuration further includes that the first communication device measures the signal sent by the second communication device to obtain synchronization error information; if the synchronization error exceeds a given threshold, the first communication device triggers sending the eighth message.

Optionally, the eighth message may be an uplink trigger signal (such as a random access preamble Preamble, a signal carrying Msg.1), SS/PBCH block, primary synchronization signal, secondary synchronization signal, and channel demodulation reference signal (demodulation At least one of reference (signal, DMRS) and channel quality measurement reference symbol (channel-state information-reference signal (CSI-RS).

Optionally, the first communication device sends an eighth resource message, where the eighth resource message is used to indicate the resource used by the second communication device to send the eighth message, and the resource of the eighth message includes time domain resources and frequency At least one of a domain resource and a code domain resource. Correspondingly, the second communication device receives the eighth resource message sent by the first communication device, and the second communication device sends the eighth message, including: the second communication device sends the eighth resource message according to the eighth resource message news. In other words, the first communication device may indicate the resource used by the second communication device to send the eighth message, and the second communication device sends the eighth message on the resource indicated by the first communication device. Taking time-frequency resources as an example, the first communication device sends an eighth resource message 1, and the eighth resource message 1 indicates the time-domain and/or frequency-domain resources used by the second communication device to send the first message, for example: {Time unit 1, band range 1}, or {time unit 2, band range 2}; further, the second communication device sends the first on the time unit 1, band range 1 according to the eighth resource message 1 Eight messages. For another example, the first communication device sends an eighth resource message 2, which indicates the time domain position of the OFDM symbol in the time slot occupied by the second communication device, such as the time domain of the OFDM symbol where the message is received The location, or, the time-domain location of the OFDM symbol where the message is sent, or not limited to the time-domain location of the OFDM symbol received or transmitted.

2703. The first communication device sends an eighth reception time, where the eighth reception time is an offset of the third time-domain reference position relative to the time-domain position of the eighth message received by the first communication device. Correspondingly, the second communication device receives the eighth reception time sent by the first communication device.

Optionally, the sixth message carries information indicating the eighth reception time; the second communication device acquiring the eighth reception time includes: the second communication device according to the indication carried by the sixth message For information on the reception time, obtain the eighth reception time. For example, the first communication device writes the eighth reception time code into the sixth message, and the second communication device parses the sixth message to obtain the eighth reception time information.

Optionally, the second communication device receives an eighth time message, and the eighth time message carries information indicating the eighth reception time; obtaining the eighth reception time by the second communication device includes: The information indicating the eighth reception time carried by the eighth time message is used to obtain the eighth reception time. For example, the first communication device writes the eighth reception time code into the eighth time message, and the second communication device parses the eighth time message to obtain the eighth reception time information.

2704. The second communication device obtains the fourth time-domain reference position according to the time-domain position of the eighth message sent by the second communication device and the eighth reception time.

In other words, the second communication device acquires the eighth reception time, which is the time offset of the time domain position of the eighth message received by the first communication device from the third time domain reference position, and the second communication device The fourth time domain reference position is acquired from the time domain position at which the eighth message is sent by the second communication device, forward or backward by an offset corresponding to the eighth reception time. The second communication device may align the third time domain reference position of the first communication device with the fourth time domain reference position, that is, the time domain position of the first communication device receiving the eighth message relative to the third The time offset of the time-domain reference position is the same as the time offset of the time-domain position of the second communication device sending the eighth message relative to the fourth time-domain reference position. For example, if the third time domain reference position is frame 15 and the first communication device receives the eighth message when the time domain position is frame 16, then the eighth reception time is an interval of 1 frame; the second communication The time domain position at which the device sends the eighth message is the 11th frame, and the second communication device may determine the fourth time domain reference position to be the 10th frame according to the eighth reception time.

2705, the first communication device sends a sixth message. Correspondingly, the second communication device receives the sixth message sent by the first communication device.

Optionally, the first communication device may send the sixth message before receiving the eighth message. Correspondingly, the second communication device may send the eighth message after receiving the sixth message.

2706. The first communication device obtains sixth transmission time information, where the sixth transmission time information is used to indicate the time when the first communication device sends the sixth message.

For specific implementation of steps 2705 to 2706, reference may be made to steps 1801 to 1802 in the embodiment shown in FIG. 18, and details are not described here.

2707. The second communication device sends sixth reception time information, where the sixth reception time information is an offset of the fourth time-domain reference position relative to the time-domain position of the sixth message received by the second communication device. Correspondingly, the first communication device obtains the sixth reception time information.

The offset of the fourth time-domain reference position relative to the time-domain position of the sixth message received by the second communication device may have various forms; it may be an offset in the sense of time, for example, 64 unit times; It may also be the offset of the time domain position, for example, 5 subframe intervals; or may be other offsets used to represent the time offset, for example, the offset of the frequency domain resource related to the time domain position.

2708. The first communication device obtains the second time offset according to the sixth transmission time information and the sixth reception time information.

In other words, the first communication device may offset the time domain position of the eighth message from the fourth time domain position of the second communication device in any form, and the sixth reception time information in any form Perform processing to obtain the second time offset. For example, the sixth reception time information is the interval of 1 radio frame, the sixth transmission time information may be the 20th radio frame, the third reference time domain position is the 18th radio frame, and the second time offset It is 0.5 radio frames. For another example, the sixth transmission time information is 1s, the sixth reception time information is 2s, and the second time offset is 0.5s.

Optionally, the second time offset may be an air interface transmission delay, that is, the eighth message and the sixth message are both air interface signaling, and the second time offset is the sixth message from the first The transmission delay from the communication device to the second communication device.

Optionally, the second time offset meets:

Optionally, when the time at which the second communication device sends the eighth message is the same as the time offset at which the first communication device receives the eighth message and the value of the second time offset, K is 2. In other words, the time offset between the third time domain reference position and the fourth time domain reference position is the same as the second time offset value.

Optionally, the first communication device may obtain a second reference offset according to the sixth transmission time information and the sixth reception time information, where the second reference offset is the third time domain reference position and the The time offset of the fourth time domain reference position.

Optionally, the second reference offset meets:

inferred.

Optionally, when the time at which the second communication device sends the eighth message is the same as the value of the time offset at which the first communication device receives the eighth message and the value of the second time offset, K is 2 . In other words, the second reference offset is the same as the first time offset value.

[Example 19]

As shown in FIG. 28, the first communication device determines a third time domain reference position, and the time corresponding to the third time domain reference position is t ₀ . The second communication device sends an eighth message, where the time corresponding to the time domain position at which the second communication device sends the eighth message is T ₈ . The first communication device receives the eighth message sent by the second communication device, and the time corresponding to the time domain position at which the first communication device receives the eighth message is T′ ₈ . The first communication device sends an eighth reception time to the second communication device, where the eighth reception time is an offset of the third time domain reference position relative to the time domain position of the first communication device receiving the eighth message The quantity, that is, the time offset corresponding to the eighth reception time is T′ ₈ -t ₀ . The second communication device acquires eighth receiving time of the first communication device to transmit, to promote T 'time offset ₈ -t ₀ forwardly from time T _8, the reference time domain to obtain the fourth position, the fourth The time corresponding to the domain reference position is T′ ₀ .

The first communication device is based on

Obtain the second time offset, where C is the second time offset.

The first communication device is based on

Obtain the second reference offset, where D is the second reference offset.

[Example 20]

As shown in FIG. 29, the first communication device sends a sixth message, and the second communication device receives the sixth message sent by the first communication device, where the time domain position corresponding to the sixth message received by the second communication device corresponds Is T′ ₆ , and the time corresponding to the time domain position at which the first communication device sends the sixth message is T ₆ .

The first communication device determines a third time domain reference position, and the time corresponding to the third time domain reference position is t ₀ . The second communication device sends an eighth message, where the time corresponding to the time domain position at which the second communication device sends the eighth message is T ₈ . The first communication device receives the eighth message sent by the second communication device, and the time corresponding to the time domain position at which the first communication device receives the eighth message is T′ ₈ . The first communication device sends an eighth reception time to the second communication device, where the eighth reception time is an offset of the third time domain reference position relative to the time domain position of the first communication device receiving the eighth message The quantity, that is, the time offset corresponding to the eighth reception time is T′ ₈ -t ₀ . The second communication device acquires eighth receiving time of the first communication device to transmit, to promote T 'time offset ₈ -t ₀ forwardly from time T _8, the reference time domain to obtain the fourth position, the fourth The time corresponding to the domain reference position is T′ ₀ .

The first communication device is based on

Obtain the second time offset, where C is the second time offset.

The first communication device is based on

Obtain the second reference offset, where D is the second reference offset.

In the embodiment of the present application, the first communication device receives the eighth message sent by the second communication device, so that the first communication device can determine the third time domain reference position, and the second communication device can determine the third Four time-domain reference positions, in this way, combining the sixth transmission time information and the sixth reception time information, the time offset between the third time-domain reference position and the fourth time-domain reference position can be offset, thereby more accurately Obtain the second time offset.

30 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device may be a network device, or may be a component (such as a chip or a circuit) for the network device. The communication device may be a terminal device or a component (such as a chip or a circuit) that can be used in the terminal device. As shown in FIG. 30, the communication device 3000 may include a receiving module 3001 and a processing module 3002.

The receiving module 3001 is configured to receive the first message sent by the second communication device.

The processing module 3002 is configured to obtain first sending time information, and the first sending time information is used to indicate the time when the second communication device sends the first message; the processing module 3002 is also used to obtain the first receiving time Time information, the first receiving time information is used to indicate the time when the receiving module receives the first message; the processing module 3002 is also used to, according to the first sending time information and the first receiving time Information to obtain the first time offset.

The receiving module 3001 may be realized by a receiver. The processing module 3002 may be implemented by a processor. The specific functions and beneficial effects of the receiving module 3001 and the processing module 3002 can be referred to the methods shown in FIG. 3, FIG. 5, FIG. 7, FIG. 12, and FIG. 15, and will not be repeated here.

In a possible embodiment, a communication device is also provided. The communication device may be a terminal device or a component (such as a chip or a circuit) that can be used for the terminal device. The communication device may be a network device, or may It is a component (such as a chip or a circuit) used in a network device. The communication device may include a transceiver and a processor, and optionally, may also include a memory. The processor may be used to implement the corresponding functions and operations of the above processing module. The memory may be used to store execution instructions or application program codes, and be controlled and executed by the processor to implement the communication method provided by the foregoing embodiments of the present application; and/or may also be used to temporarily store some data and instruction information. The memory may exist independently of the processor, and at this time, the memory may be connected to the processor through a communication line. In another possible design, the memory may also be integrated with the processor, which is not limited in this embodiment of the present application.

FIG. 31 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device may be a network device, or may be a component (such as a chip or a circuit) for the network device. The communication device may be a terminal device or a component (such as a chip or a circuit) that can be used in the terminal device. As shown in FIG. 31, the communication device 3100 may include a sending module 3101.

The sending module 3101 is used to send the first message.

The sending module 3101 may be implemented by a sender. The specific functions and beneficial effects of the sending module 3101 can be referred to the methods shown in FIG. 3, FIG. 5, FIG. 7, FIG. 12, and FIG. 15, which will not be repeated here.

In a possible embodiment, a communication device is also provided. The communication device may be a network device, or may be a component (such as a chip or a circuit) for the network device. The communication device may be a terminal device or a component (such as a chip or a circuit) that can be used in the terminal device. The communication device may include a transceiver, and optionally, may also include a processor and a memory. The processor may be used to implement the corresponding functions and operations of the above processing module. The memory may be used to store execution instructions or application program codes, and be controlled and executed by the processor to implement the communication method provided by the foregoing embodiments of the present application; and/or may also be used to temporarily store some data and instruction information. The memory may exist independently of the processor, and at this time, the memory may be connected to the processor through a communication line. In another possible design, the memory may also be integrated with the processor, which is not limited in the embodiments of the present application.

32 is a structural block diagram of a communication device according to an embodiment of the present application. The communication device may be a network device, or may be a component (such as a chip or a circuit) for the network device. The communication device may be a terminal device or a component (such as a chip or a circuit) that can be used in the terminal device. As shown in FIG. 32, the communication device 3200 includes a sending module 3201 and a processing module 3202.

The sending module 3201 is configured to send a sixth message.

The processing module 3202 is used to obtain sixth sending time information, and the sixth sending time information is used to indicate the time when the first communication device sends the sixth message; the processing module 3202 is also used to obtain the sixth receiving time Time information, the sixth receiving time information is used to indicate the time when the second communication device receives the sixth message; the processing module 3202 is also used to, according to the sixth sending time information and the sixth Receive the time information and obtain the second time offset.

The sending module 3201 may be implemented by a sender. The processing module 3202 may be implemented by a processor. For specific functions and beneficial effects of the sending module 3201 and the processing module 3202, reference may be made to the methods shown in FIG. 18, FIG. 20, FIG. 22, and FIG. 27, and details are not described herein again.

In a possible embodiment, a communication device is also provided. The communication device may be a network device, or may be a component (such as a chip or a circuit) for the network device. The communication device may be a terminal device or a component (such as a chip or a circuit) that can be used in the terminal device. The communication device may include a transceiver and a processor, and optionally, may also include a memory. The transceiver can be used to implement the corresponding functions and operations corresponding to the above-mentioned receiving module and the sending module, and the processor can be used to implement the corresponding functions and operations of the above-mentioned processing module. The memory may be used to store execution instructions or application program codes, and be controlled and executed by the processor to implement the communication method provided by the foregoing embodiments of the present application; and/or may also be used to temporarily store some data and instruction information. The memory may exist independently of the processor, and at this time, the memory may be connected to the processor through a communication line. In another possible design, the memory may also be integrated with the processor, which is not limited in the embodiments of the present application.

33 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device may be a network device, or may be a component (such as a chip or a circuit) for the network device. The communication device may be a terminal device or a component (such as a chip or a circuit) that can be used in the terminal device. As shown in FIG. 33, the communication device 3300 may include a receiving module 3301 and a sending module 3302.

The receiving module 3301 is configured to receive the sixth message sent by the first communication device.

The sending module 3302 is configured to send sixth reception time information, where the sixth reception time information is used to indicate the time when the second communication device receives the sixth message.

The receiving module 3301 may be realized by a receiver. The sending module 3302 may be implemented by a transmitter. For specific functions and beneficial effects of the receiving module 3301 and the sending module 3302, reference may be made to the methods shown in FIG. 18, FIG. 20, FIG. 22, and FIG. 27, and details are not described herein again.

In a possible embodiment, a communication device is also provided. The communication device may be a network device, or may be a component (such as a chip or a circuit) used in the network device. The communication device may be a terminal device. It may be a component (such as a chip or a circuit) that can be used in a terminal device. The communication device may include a transceiver, and optionally, may also include a processor and a memory. The processor may be used to implement the corresponding functions and operations of the above processing module. The memory may be used to store execution instructions or application program codes, and be controlled and executed by the processor to implement the communication method provided by the foregoing embodiments of the present application; and/or may also be used to temporarily store some data and instruction information. The memory may exist independently of the processor, and at this time, the memory may be connected to the processor through a communication line. In another possible design, the memory may also be integrated with the processor, which is not limited in the embodiments of the present application.

34 is a structural block diagram of a terminal device according to an embodiment of the present invention. As shown in FIG. 34, the terminal device includes a processor 3401, a memory 3402, a radio frequency circuit, an antenna, and input and output devices. The processor 3401 may be used to process communication protocols and communication data, control terminal devices, execute software programs, process data of software programs, and so on. The memory 3402 is mainly used to store software programs and data. The radio frequency circuit is mainly used for the conversion of the baseband signal and the radio frequency signal and the processing of the radio frequency signal. The antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, and keyboards, are mainly used to receive data input by users and output data to users. It should be noted that some types of terminal devices may not have input/output devices.

When data needs to be sent, the processor 3401 performs baseband processing on the data to be sent, and outputs the baseband signal to the radio frequency circuit. The radio frequency circuit processes the baseband signal after radio frequency processing, and then sends the radio frequency signal in the form of electromagnetic waves through the antenna. When data is sent to the terminal device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data. For ease of explanation, only one memory and processor are shown in FIG. 34. In actual terminal equipment products, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or storage device. The memory may be set independently of the processor, or may be integrated with the processor, which is not limited in the embodiments of the present application.

In the embodiment of the present application, an antenna and a radio frequency circuit with a transceiver function can be regarded as a transceiver 3403 of a terminal device, and a processor with a processing function can be regarded as a processing unit of the terminal device. The transceiver may also be called a transceiver unit, a transceiver, a transceiver device, or the like. The processing unit may also be called a processor, a processing board, a processing module, a processing device, and the like. Optionally, the device used to implement the receiving function in the transceiver 3403 can be regarded as a receiving unit, and the device used to implement the transmitting function in the transceiver 3403 can be regarded as a transmitting unit, that is, the transceiver 3403 includes a receiving unit and a transmitting unit. The receiving unit may sometimes be called a receiver, a receiver, or a receiving circuit. The sending unit may sometimes be called a transmitter, a transmitter, or a transmitting circuit.

The processor 3401, the memory 3402 and the transceiver 3403 communicate with each other through an internal connection path, and transfer control and/or data signals

The method disclosed in the foregoing embodiment of the present invention may be applied to the processor 3401 or implemented by the processor 3401. The processor 3401 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 3401 or instructions in the form of software.

The processor described in the embodiments of the present application may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), or an existing programmable gate array (field programmable gate array) , FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The disclosed methods, steps, and logical block diagrams in the embodiments of the present invention may be implemented or executed. The general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present invention may be directly embodied and executed by a hardware decoding processor, or may be executed and completed by a combination of hardware and software modules in the decoding processor. The software module may be located in random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory or electrically erasable programmable memory, registers, etc. Storage media. The storage medium is located in the memory. The processor reads the instructions in the memory and combines the hardware to complete the steps of the above method.

Optionally, in some embodiments, the memory 3402 may store instructions for performing the method performed by the terminal device in the method shown in FIG. 3. The processor 3401 can execute the instructions stored in the memory 3402 in combination with other hardware (for example, the transceiver 3403) to complete the steps performed by the terminal device in the method shown in FIG. 3. For the specific working process and beneficial effects, refer to the embodiment shown in FIG. description.

Optionally, in some embodiments, the memory 3402 may store instructions for performing the method performed by the terminal device in the method shown in FIG. 5. The processor 3401 can execute the instructions stored in the memory 3402 in combination with other hardware (such as the transceiver 3403) to complete the steps performed by the terminal device in the method shown in FIG. 5. For the specific working process and beneficial effects, refer to the embodiment shown in FIG. description.

Optionally, in some embodiments, the memory 3402 may store instructions for executing the method performed by the terminal device in the method shown in FIG. 7. The processor 3401 can execute the instructions stored in the memory 3402 in combination with other hardware (such as the transceiver 3403) to complete the steps performed by the terminal device in the method shown in FIG. 7. For the specific working process and beneficial effects, refer to the embodiment shown in FIG. description.

Optionally, in some embodiments, the memory 3402 may store instructions for performing the method performed by the terminal device in the method shown in FIG. 12. The processor 3401 can execute the instructions stored in the memory 3402 in combination with other hardware (for example, the transceiver 3403) to complete the steps performed by the terminal device in the method shown in FIG. 12, for the specific working process and beneficial effects, refer to the embodiment shown in FIG. description.

Optionally, in some embodiments, the memory 3402 may store instructions for performing the method performed by the terminal device in the method shown in FIG. 15. The processor 3401 can execute the instructions stored in the memory 3402 in combination with other hardware (such as the transceiver 3403) to complete the steps performed by the terminal device in the method shown in FIG. 15. For the specific working process and beneficial effects, refer to the embodiment shown in FIG. description.

Optionally, in some embodiments, the memory 3402 may store instructions for executing the method performed by the terminal device in the method shown in FIG. 18. The processor 3401 can execute the instructions stored in the memory 3402 in combination with other hardware (such as the transceiver 3403) to complete the steps performed by the terminal device in the method shown in FIG. 18. For the specific working process and beneficial effects, refer to the embodiment shown in FIG. description.

Optionally, in some embodiments, the memory 3402 may store instructions for performing the method performed by the terminal device in the method shown in FIG. 20. The processor 3401 can execute the instructions stored in the memory 3402 in combination with other hardware (such as the transceiver 3403) to complete the steps performed by the terminal device in the method shown in FIG. 20. For the specific working process and beneficial effects, refer to the embodiment shown in FIG. 20 description.

Optionally, in some embodiments, the memory 3402 may store instructions for performing the method performed by the terminal device in the method shown in FIG. 22. The processor 3401 can execute the instructions stored in the memory 3402 in combination with other hardware (such as the transceiver 3403) to complete the steps performed by the terminal device in the method shown in FIG. 22. For the specific working process and beneficial effects, refer to the embodiment shown in FIG. description.

Optionally, in some embodiments, the memory 3402 may store instructions for performing the method performed by the terminal device in the method shown in FIG. 27. The processor 3401 can execute the instructions stored in the memory 3402 in combination with other hardware (such as the transceiver 3403) to complete the steps performed by the terminal device in the method shown in FIG. 27. For the specific working process and beneficial effects, refer to the embodiment shown in FIG. description.

An embodiment of the present application further provides a chip including a transceiver unit and a processing unit. The transceiver unit may be an input-output circuit and a communication interface; the processing unit is a processor or a microprocessor or an integrated circuit integrated on the chip. The chip may execute the method on the terminal device side in the above method embodiments.

Embodiments of the present application also provide a computer-readable storage medium on which instructions are stored, and when the instructions are executed, the method on the terminal device side in the above method embodiment is executed.

Embodiments of the present application also provide a computer program product containing instructions, which execute the method on the terminal device side in the foregoing method embodiments when the instructions are executed.

35 is a structural block diagram of a network device according to an embodiment of the present invention. The network device 3500 shown in FIG. 10 includes: a processor 3501, a memory 3502, and a transceiver 3503.

The processor 3501, the memory 3502, and the transceiver 3503 communicate with each other through an internal connection path, and transfer control and/or data signals.

The method disclosed in the foregoing embodiments of the present invention may be applied to the processor 3501, or implemented by the processor 3501. The processor 3501 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 3501 or an instruction in the form of software. The aforementioned processor 3501 may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an existing programmable gate array (FPGA), or other Programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The disclosed methods, steps, and logical block diagrams in the embodiments of the present invention may be implemented or executed. The general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present invention may be directly embodied and executed by a hardware decoding processor, or may be executed and completed by a combination of hardware and software modules in the decoding processor. The software module may be located in random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory or electrically erasable programmable memory, registers, etc. Storage media. The storage medium is located in the memory 3502, and the processor 3501 reads the instructions in the memory 3502 and completes the steps of the above method in combination with its hardware.

Optionally, in some embodiments, the memory 3502 may store instructions for performing the method performed by the network device in the method shown in FIG. 3. The processor 3501 can execute the instructions stored in the memory 3502 in combination with other hardware (for example, the transceiver 3503) to complete the steps of the network device in the method shown in FIG. 3. For the specific working process and beneficial effects, refer to the description in the embodiment shown in FIG. 3. .

Optionally, in some embodiments, the memory 3502 may store instructions for performing the method performed by the network device in the method shown in FIG. 5. The processor 3501 can execute the instructions stored in the memory 3502 in combination with other hardware (such as the transceiver 3503) to complete the steps of the network device in the method shown in FIG. 5. For the specific working process and beneficial effects, refer to the description in the embodiment shown in FIG. .

Optionally, in some embodiments, the memory 3502 may store instructions for performing the method performed by the network device in the method shown in FIG. 7. The processor 3501 can execute the instructions stored in the memory 3502 in combination with other hardware (such as the transceiver 3503) to complete the steps of the network device in the method shown in FIG. 7. For the specific working process and beneficial effects, refer to the description in the embodiment shown in FIG. 7. .

Optionally, in some embodiments, the memory 3502 may store instructions for performing the method performed by the network device in the method shown in FIG. 12. The processor 3501 can execute the instructions stored in the memory 3502 in combination with other hardware (such as a transceiver 3503) to complete the steps of the network device in the method shown in FIG. 12, for the specific working process and beneficial effects, refer to the description in the embodiment shown in FIG. .

Optionally, in some embodiments, the memory 3502 may store instructions for performing the method performed by the network device in the method shown in FIG. 15. The processor 3501 can execute the instructions stored in the memory 3502 in combination with other hardware (for example, the transceiver 3503) to complete the steps of the network device in the method shown in FIG. 15. For the specific working process and beneficial effects, refer to the description in the embodiment shown in FIG. 15. .

Optionally, in some embodiments, the memory 3502 may store instructions for performing the method performed by the network device in the method shown in FIG. 18. The processor 3501 can execute the instructions stored in the memory 3502 in combination with other hardware (such as the transceiver 3503) to complete the steps of the network device in the method shown in FIG. 18. For the specific working process and beneficial effects, refer to the description in the embodiment shown in FIG. 18. .

Optionally, in some embodiments, the memory 3502 may store instructions for performing the method performed by the network device in the method shown in FIG. The processor 3501 can execute the instructions stored in the memory 3502 in combination with other hardware (such as the transceiver 3503) to complete the steps of the network device in the method shown in FIG. 20. For the specific working process and beneficial effects, refer to the description in the embodiment shown in FIG. .

Optionally, in some embodiments, the memory 3502 may store instructions for performing the method performed by the network device in the method shown in FIG. 22. The processor 3501 can execute the instructions stored in the memory 3502 in combination with other hardware (such as the transceiver 3503) to complete the steps of the network device in the method shown in FIG. 22. For the specific working process and beneficial effects, refer to the description in the embodiment shown in FIG. 22. .

Optionally, in some embodiments, the memory 3502 may store instructions for performing the method performed by the network device in the method shown in FIG. 27. The processor 3501 can execute the instructions stored in the memory 3502 in combination with other hardware (such as the transceiver 3503) to complete the steps of the network device in the method shown in FIG. 27. For the specific working process and beneficial effects, refer to the description in the embodiment shown in FIG. .

An embodiment of the present application further provides a chip including a transceiver unit and a processing unit. The transceiver unit may be an input-output circuit and a communication interface; the processing unit is a processor or a microprocessor or an integrated circuit integrated on the chip. The chip may execute the method performed by the network device side in the foregoing embodiment.

As another form of this embodiment, a computer-readable storage medium is provided, on which instructions are stored, and when the instructions are executed, the method on the network device side in the above method embodiment is executed.

As another form of this embodiment, a computer program product containing instructions is provided, and when the instructions are executed, the method on the network device side in the foregoing method embodiment is performed.

Those of ordinary skill in the art may realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application of the technical solution and design constraints. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that for the convenience and conciseness of the description, the specific working processes of the above-described systems, devices, and units can refer to the corresponding processes in the foregoing method embodiments, and details are not described herein again.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the unit is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical, or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application essentially or part of the contribution to the existing technology or part of the technical solution can be embodied in the form of a software product, the computer software product is stored in a storage medium, including Several instructions are used to enable a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. The foregoing storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

The above is only the specific implementation of this application, but the scope of protection of this application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application. It should be covered by the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A synchronization method, characterized in that it includes:

The first communication device receives the first message sent by the second communication device;

The first communication device acquires first transmission time information, and the first transmission time information is used to indicate a time when the second communication device transmits the first message;

The first communication device acquires first reception time information, where the first reception time information is used to indicate the time when the first communication device receives the first message;

The first communication device obtains a first time offset according to the first transmission time information and the first reception time information.
The method according to claim 1, wherein the first message carries the first sending time information;

The first communication device acquiring the first sending time information includes:

The first communication device obtains the first sending time information carried by the first message.
The method according to claim 1, wherein before the first communication device obtains the first transmission time information, the method further comprises:

Receiving, by the first communication device, a first time message sent by the second communication device, where the first time message carries the first sending time information;

The first communication device acquiring the first sending time information includes:

The first communication device obtains the first sending time information carried by the first time message.
The method according to claim 1, wherein the first communication device acquiring the first sending time information includes:

The first communication device determines resources of the first message;

The first communication device obtains the first sending time information according to the resources of the first message. The resources of the first message include at least one of time domain resources, frequency domain resources, and code domain resources.
The method according to claim 1, wherein the method further comprises:

The first communication device sends a second time message, and the second time message is used to indicate the first sending time information.
The method according to any one of claims 1-5, wherein the method further comprises:

The first communication device obtains a first reference offset, the first reference offset is a time offset between the first reference and the second reference, and the first reference is a reference of the second communication device , The second reference is a reference of the first communication device;

The first communication device acquiring the first time offset according to the first transmission time information and the first reception time information includes:

The first communication device acquires the first time offset according to the first transmission time information, the first reception time information, and the first reference offset.
The method according to any one of claims 1 to 5, wherein the first transmission time information is a time domain of the first time domain reference position relative to the second communication device sending the first message Position offset;

Before the first communication device obtains the first time offset according to the first transmission time information and the first reception time information, the method further includes:

The first communication device sends a second message;

The first communication device obtains a second time-domain reference position according to the time-domain position of the second message sent by the first communication device.
The method according to claim 7, wherein the second time domain reference position is a time domain position where the first communication device sends the second message.
The method according to claim 7, wherein before the first communication device obtains the second time-domain reference position according to the time-domain position of the second message sent by the first communication device, the method Also includes:

The first communication device obtains a second reception time, which is an offset of the first time-domain reference position relative to the time-domain position of the second message received by the second communication device ;

The first communication device acquiring the second time-domain reference position according to the time-domain position of the second message sent by the first communication device includes:

The first communication device obtains the second time-domain reference position according to the time-domain position at which the first communication device sends the second message and the second reception time.
The method according to any one of claims 7-9, wherein the method further comprises:

The first communication device obtains a first reference offset based on the first transmission time information and the first reception time information, where the first reference offset is the first time-domain reference position and The time offset of the second time domain reference position.
The method according to any one of claims 1 to 5, wherein the first transmission time information is a time domain of the first time domain reference position relative to the second communication device sending the first message Position offset;

Before the first communication device obtains the first time offset according to the first transmission time information and the first reception time information, the method further includes:

The first communication device obtains the second time domain reference position;

The first communication device sends a third message and a third sending time, where the third sending time is the second time domain reference position relative to the time domain position of the first communication device sending the third message Offset.
The method according to claim 11, wherein the method further comprises:

The first communication device obtains a first reference offset based on the first transmission time information and the first reception time information, where the first reference offset is the first time-domain reference position and The time offset of the second time domain reference position.
The method according to any one of claims 1 to 5, wherein the first communication device obtains a first time offset based on the first transmission time information and the first reception time information Previously, the method also included:

The first communication device sends a fourth message;

The first communication device obtains fourth transmission time information, where the fourth transmission time information is used to indicate the time when the first communication device sends the fourth message;

The first communication device acquires fourth reception time information, where the fourth reception time information is used to indicate the time when the second communication device receives the fourth message;

The first communication device acquiring the first time offset according to the first transmission time information and the first reception time information includes:

The first communication device acquires the first time offset according to the first transmission time information, the first reception time information, the fourth transmission time information, and the fourth reception time information.
The method according to claim 13, wherein the method further comprises: the first communication device according to the first transmission time information, the first reception time information, the fourth transmission time information and The fourth receiving time information obtains a first reference offset, where the first reference offset is a time offset between a first reference and a second reference, and the first reference is the second communication device Reference, the second reference is a reference of the first communication device.
The method according to any one of claims 1-14, wherein the method further comprises:

The first communication device sends a fifth message to the second communication device, where the fifth message carries information indicating the first time offset.
The method according to any one of claims 1-15, wherein the method further comprises:

The first communication device receives the cell ID sent by the second communication device, and obtains the correspondence between the first time offset and the cell ID.
The method according to any one of claims 1-16, wherein the first message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal One kind.
A synchronization method, characterized in that it includes:

The first communication device sends a sixth message;

The first communication device obtains sixth transmission time information, where the sixth transmission time information is used to indicate the time when the first communication device sends the sixth message;

The first communication device obtains sixth reception time information, where the sixth reception time information is used to indicate the time when the second communication device receives the sixth message;

The first communication device obtains a second time offset according to the sixth transmission time information and the sixth reception time information.
The method of claim 18, further comprising:

Receiving, by the first communication device, a fifth time message sent by the second communication device, where the fifth time message is used to indicate the sixth sending time information;

The first communication device sends a sixth message, including:

The first communication device sends the sixth message according to the sixth sending time information indicated by the fifth time message.
The method according to claim 18 or 19, wherein the method further comprises:

The first communication device acquires a second reference offset, the second reference offset is a time offset between a third reference and a fourth reference, and the third reference is a reference of the first communication device , The fourth reference is a reference of the second communication device;

The first communication device acquiring the second time offset according to the sixth transmission time information and the sixth reception time information includes:

The first communication device acquires the second time offset according to the sixth transmission time information, the sixth reception time information, and the second reference offset.
The method according to claim 18 or 19, wherein the sixth received time information is a deviation of a fourth time domain reference position relative to a time domain position where the second communication device receives the sixth message Shift

Before the first communication device obtains the second time offset according to the sixth transmission time information and the sixth reception time information, the method further includes:

The first communication device receives a seventh message sent by the second communication device;

The first communication device obtains a third time-domain reference position according to the time-domain position of the seventh message received by the first communication device.
The method according to claim 21, wherein the third time domain reference position is a time domain position where the first communication device receives the seventh message.
The method according to claim 21, wherein before the first communication device obtains the third time-domain reference position according to the time-domain position of the first message received by the first communication device, the The method also includes:

The first communication device acquires a seventh transmission time, where the seventh transmission time is an offset of the fourth time-domain reference position relative to the time-domain position at which the second communication device sends the seventh message;

The first communication device acquiring the third time-domain reference position according to the time-domain position of the first message received by the first communication device includes:

The first communication device acquires the third time-domain reference position according to the seventh transmission time and the time-domain position of the first message received by the first communication device.
The method according to any one of claims 21-23, wherein the method further comprises:

The first communication device obtains a second reference offset according to the sixth transmission time information and the sixth reception time information, where the second reference offset is the third time-domain reference position and The time offset of the fourth time domain reference position.
The method according to claim 18 or 19, wherein the sixth received time information is a deviation of a fourth time domain reference position relative to a time domain position where the second communication device receives the sixth message Shift

Before the first communication device obtains the second time offset according to the sixth transmission time information and the sixth reception time information, the method further includes:

The first communication device obtains the third time-domain reference position;

The first communication device receives the eighth message sent by the second communication device;

The first communication device sends an eighth reception time, where the eighth reception time is an offset of the third time-domain reference position relative to the time-domain position at which the first communication device receives the eighth message .
The method according to claim 25, wherein the method further comprises:

The first communication device obtains a second reference offset according to the sixth transmission time information and the sixth reception time information, where the second reference offset is the third time domain reference position and the second The time offset of the four-time reference position.
The method according to any one of claims 18 to 26, wherein the method further comprises:

The first communication device sends a ninth message to the second communication device, where the ninth message carries information indicating the second time offset.
The method according to any one of claims 18 to 27, wherein the method further comprises:

The first communication device receives the cell ID sent by the second communication device, and obtains the correspondence between the second time offset and the cell ID.
The method according to any one of claims 18 to 28, wherein the sixth message is at least one of an uplink trigger signal, a synchronous broadcast channel block, a primary synchronization signal, a secondary synchronization signal, and a channel demodulation reference signal One kind.
A communication device, characterized in that the device includes a module for performing the method according to any one of claims 1-17.
A communication device, characterized in that the device includes a module for performing the method according to any one of claims 18-29.
A readable storage medium includes a program or instruction, and when the program or instruction runs on a computer, the method according to any one of claims 1-17 is executed.
A readable storage medium includes a program or instructions, and when the program or instructions run on a computer, the method according to any one of claims 18-29 is executed.
A computer program product containing instructions, characterized in that, when the computer program product runs on a computer, it causes the computer to execute the method according to any one of claims 1-17.
A computer program product containing instructions, characterized in that, when the computer program product runs on a computer, it causes the computer to execute the method according to any one of claims 18-29.