CN110831144B - Communication method and device - Google Patents
Communication method and device Download PDFInfo
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- CN110831144B CN110831144B CN201810903994.6A CN201810903994A CN110831144B CN 110831144 B CN110831144 B CN 110831144B CN 201810903994 A CN201810903994 A CN 201810903994A CN 110831144 B CN110831144 B CN 110831144B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
Abstract
The embodiment of the application provides a communication method and a communication device, wherein the method comprises the following steps: the network equipment determines synchronous indication information, wherein the synchronous indication information is used for indicating the time synchronization of the terminal equipment; and the network equipment sends the synchronization indication information. By the method, the network equipment indicates the time synchronization of the terminal equipment through the synchronization indication information, so that the terminal equipment can perform time synchronization in time according to the synchronization indication information, and the problem that the terminal equipment cannot update time in time to cause time asynchronization with the network equipment is solved. The network equipment indicates the time synchronization of the terminal equipment through the synchronization indication information, so that the terminal equipment can perform time synchronization in time according to the synchronization indication information, and the problem that the time of the terminal equipment is not synchronized with the time of the network equipment due to the fact that the terminal equipment cannot perform time updating in time is solved.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a communication method and apparatus.
Background
In the existing mobile communication system, as well as the future 5th Generation cellular mobile communication system (5G), i.e. New Radio (NR), in order to ensure the delay and reliability of services such as ultra-reliable and low latency communication (URLLC), it is necessary to synchronize the time of each node through which a data packet passes in the network.
Currently, the base station may perform time synchronization through a Global Navigation Satellite System (GNSS) or 1588 protocol. To ensure time synchronization of the terminal device, the base station may maintain time synchronization with the base station by transmitting a System Information Block (SIB) 16 to the terminal device, the SIB16 including time information, and the terminal device may maintain time synchronization with the base station according to the time information in the SIB 16. In order to reduce the power consumption of the terminal device, etc., the terminal device does not listen to and receive all SIBs 16 transmitted by the base station.
Because the clock accuracy of the base station is low and the time drift phenomenon exists, the base station needs to continuously update the time of the base station, so that the time synchronization is kept. When the base station corrects the time offset due to the time drift, the time of the base station jumps. The terminal equipment is informed by SIB16 after the time hopping of the base station. However, since the terminal device does not monitor and receive all SIBs 16 sent by the base station, the terminal device cannot update the time in time, which results in time synchronization with the base station, and further results in that the time delay and reliability of services such as URLLC cannot be guaranteed.
Disclosure of Invention
The embodiment of the application provides a communication method and a communication device, which are used for solving the problem that time of a terminal device cannot be updated in time, so that the time of the terminal device is not synchronous with the time of a base station.
In a first aspect, an embodiment of the present application provides a communication method, where the method includes:
the network equipment determines synchronous indication information, wherein the synchronous indication information is used for indicating the time synchronization of the terminal equipment; and the network equipment sends the synchronization indication information.
By the method, the network equipment indicates the time synchronization of the terminal equipment through the synchronization indication information, so that the terminal equipment can perform time synchronization in time according to the synchronization indication information, and the problem that the terminal equipment cannot update time in time to cause time asynchronization with the network equipment is solved.
In one possible design, the synchronization indication information includes:
the period information indicates an update period of system time or a synchronization period for indicating the terminal equipment to perform time synchronization; offset value information indicating an offset value in a time domain of a time point of the system time update with respect to a reference time point or indicating an offset value in a time domain of a time point of the terminal device performing time synchronization with respect to a reference time point.
In one possible design, the synchronization indication information further includes: update accuracy information of the system time.
By the method, the network equipment can indicate the updating precision information of each period of the system time, so that the terminal equipment can determine the deviation between the time of the terminal equipment and the system time.
In one possible design, the network device sending the synchronization indication information includes: the network equipment sends the synchronization indication information through a system information block; or, the network device sends the synchronization indication information through Radio Resource Control (RRC) signaling.
In a possible design, the synchronization indication information is a paging message, or the synchronization indication information is downlink control information DCI scrambled by using a radio network temporary identity RNTI.
By the method, the network equipment can timely indicate the terminal equipment to carry out time synchronization under the condition of ensuring the compatibility with the existing communication protocol.
In a possible design, the synchronization indication information includes updated system time, or the synchronization indication information includes a time adjustment amount of the system time.
By the method, the network equipment can directly indicate the updated system time or the time adjustment amount of the system time, so that power consumption caused by monitoring the system information block by the terminal equipment is avoided.
In a possible design, the synchronization indication information is downlink control information DCI scrambled by using an RNTI, and the method further includes: and the network equipment sends monitoring indication information to the terminal equipment, wherein the monitoring indication information is used for indicating a monitoring period for monitoring the DCI.
By the method, the network equipment sets the monitoring period for the terminal equipment by monitoring the indication information, so that power consumption caused by frequent DCI monitoring of the terminal equipment is avoided.
In a second aspect, an embodiment of the present application provides a communication apparatus, which includes a processor coupled with a memory, wherein: the memory is used for storing instructions; the processor is configured to execute the method according to the first aspect or any one of the possible designs of the first aspect, in accordance with instructions stored by the execution memory. Optionally, the communication device may further include a transceiver for supporting the communication device to perform information transmission and/or reception in the above method. Optionally, the communication device may be a network device, or may be a device in a network device, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and/or discrete devices.
In a third aspect, an embodiment of the present application provides a communication apparatus, configured to implement any one of the above first aspect or the first aspect, where the communication apparatus includes corresponding functional modules, for example, includes a receiving unit, a sending unit, and the like, which are respectively configured to implement the steps in the above method.
In a fourth aspect, an embodiment of the present application provides a communication method, including:
the method comprises the steps that terminal equipment receives synchronous indication information from network equipment, wherein the synchronous indication information is used for indicating the terminal equipment to carry out time synchronization; and the terminal equipment carries out time synchronization according to the synchronization indication information.
By the method, the terminal equipment performs time synchronization according to the synchronization indication information, and the problem that the terminal equipment cannot update time in time and is asynchronous with the network equipment is solved.
In one possible design, the time synchronization performed by the terminal device according to the synchronization indication information includes: and the terminal equipment receives a system information block according to the synchronous indication information and updates the time of the terminal equipment according to the system time in the system information block.
In a possible design, the synchronization indication information is a paging message, or the synchronization indication information is downlink control information DCI scrambled by using a radio network temporary identity RNTI.
By the method, the terminal equipment can determine that time synchronization is required when the terminal equipment receives the paging message or the DCI scrambled by the RNTI, so that the time of the terminal equipment is updated according to the system time in the system information block.
In one possible design, the synchronization indication information includes:
the period information indicates an update period of system time or a synchronization period for indicating the terminal equipment to perform time synchronization; and offset value information indicating an offset value in the time domain of a time point of the system time update with respect to a reference time point or indicating an offset value in the time domain of a time point of the terminal device performing time synchronization with respect to a reference time point.
In one possible design, the synchronization indication information further includes: update accuracy information of the system time.
In one possible design, the time synchronization performed by the terminal device according to the synchronization indication information includes:
and the terminal equipment determines that the difference value between the time of the terminal equipment and the system time is greater than a threshold value according to the period information and the updating precision information, acquires the system time according to the period information and the deviant information, and updates the time of the terminal equipment according to the system time.
By the method, the terminal equipment can determine whether to perform time synchronization according to the threshold value, so that power consumption caused by time synchronization in each period is avoided.
In one possible design, the time synchronization performed by the terminal device according to the synchronization indication information includes:
and the terminal equipment acquires the system time according to the period information and the deviant information and updates the time of the terminal equipment according to the system time.
In a possible design, the synchronization indication information includes updated system time, or the synchronization indication information includes a time adjustment amount of the system time.
By the method, the terminal equipment can directly perform time synchronization according to the updated system time in the synchronization indication information or the time adjustment quantity of the system time, so that power consumption caused by monitoring the system information block comprising the system time by the terminal equipment is avoided.
In one possible design, the time synchronization performed by the terminal device according to the synchronization indication information includes:
when the synchronization indication information comprises the updated system time, the terminal equipment updates the time of the terminal equipment according to the updated system time in the synchronization indication information; or when the synchronization indication information includes the time adjustment amount of the system time, the terminal device updates the time of the terminal device according to the time adjustment amount of the system time in the synchronization indication information.
In a possible design, the synchronization indication information is downlink control information DCI scrambled by using an RNTI, and the method further includes: the terminal equipment receives monitoring indication information from the network equipment, wherein the monitoring indication information is used for indicating the monitoring period of the DCI monitored by the terminal equipment; and the terminal equipment monitors the DCI according to the monitoring period.
By the method, the terminal equipment monitors the DCI according to the monitoring period indicated by the monitoring indication information, so that power consumption caused by frequent monitoring of the DCI by the terminal equipment is avoided.
In a fifth aspect, an embodiment of the present application provides a communication apparatus, which includes a processor coupled with a memory, wherein: the memory is used for storing instructions; the processor is configured to perform the method of the fourth aspect or any of the possible designs of the fourth aspect, in accordance with instructions stored by the execution memory. Optionally, the communication device may further include a transceiver for supporting the communication device to perform information transmission and/or reception in the above method. Optionally, the communication device may be a terminal device, or may be a device in the terminal device, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and/or discrete devices.
In a sixth aspect, an embodiment of the present application provides a communication apparatus, configured to implement any one of the above fourth aspect or fourth aspect, where the communication apparatus includes corresponding functional modules, for example, a processing unit, a transceiver unit, and the like, that are respectively configured to implement the steps in the above method.
In a seventh aspect, an embodiment of the present application provides a computer-readable storage medium, where computer-readable instructions are stored, and when the computer-readable instructions are read and executed by a computer, the computer is caused to perform the method in any one of the above aspects or any one of the possible designs of any one of the above aspects.
In an eighth aspect, embodiments of the present application provide a computer program product, which when read and executed by a computer, causes the computer to perform the method of any one of the above aspects or any one of the possible designs of any one of the aspects.
In a ninth aspect, embodiments of the present application provide a chip, where the chip is connected to a memory, and is configured to read and execute a software program stored in the memory, so as to implement the method in any one of the above aspects or any one of the possible designs of any one of the above aspects.
In a tenth aspect, embodiments of the present application provide a communications apparatus, including a processor, coupled with a memory, that reads and executes instructions in the memory to implement a method in any one of the above aspects or any one of the possible designs of any one of the above aspects.
In an eleventh aspect, an embodiment of the present application provides a communication system, including the communication apparatus in the second aspect and the communication apparatus in the fifth aspect.
Drawings
FIG. 1 is a schematic diagram of a system architecture suitable for use in embodiments of the present application;
fig. 2 is a schematic diagram of a system time broadcast according to an embodiment of the present application;
fig. 3 is a schematic flowchart of a communication method according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a communication device according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a communication device according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a communication device according to an embodiment of the present application.
Detailed Description
The embodiments of the present application will be described in detail below with reference to the drawings attached hereto.
The embodiment of the application can be applied to mobile communication systems of various systems, such as: a New Radio (NR) system, a Long Term Evolution (LTE) system, an advanced long term evolution (LTE-a) system, an evolved Long Term Evolution (LTE) system, and a future communication system, etc., which are not limited herein.
Fig. 1 is a schematic diagram illustrating a system architecture suitable for an embodiment of the present application, and as shown in fig. 1, a network device may update a system time of the network device through a satellite, so as to keep the system time of the network device consistent with an absolute time (absolute time) on the satellite. The network device can also broadcast the system time, and the terminal device can update the time of the terminal device according to the system time broadcast by the network device.
For example, as shown in fig. 2, a schematic diagram of a system time broadcast provided in the embodiment of the present application is shown. The network device transmits the system time through a System Information Block (SIB). The SIBs may be transmitted periodically. The terminal device may not need to receive each SIB transmitted by the network device, and may receive the SIB only once after establishing a wireless connection with the network device, so as to perform time synchronization according to the system time in the SIB. However, the network device may periodically update the system time, and if the network device drifts due to the clock, the updated system time may jump. For example, the period for time synchronization between the network device and the satellite is 10 seconds. The current system time of the network equipment is 4 months, 13 days, 7 hours, 40 minutes, 20 seconds, 30 milliseconds and 20 microseconds, the network equipment performs time synchronization with the satellite after 10 seconds, and determines that the absolute time in the satellite is 4 months, 13 days, 7 hours, 40 minutes, 30 seconds, 30 milliseconds and 25 microseconds, and then the system time in the network equipment is hopped to the absolute time in the satellite from 4 months, 13 days, 7 hours, 40 minutes, 30 seconds and 20 microseconds, so that the absolute time synchronization is realized. The network device updates the system time in the next SIB sent, however, the terminal device may not determine whether the network device updates the system time, and may not receive the SIB, which may cause an excessive difference between the time in the terminal device and the system time, and thus, delay and reliability of the service may not be guaranteed.
In the embodiment of the present application, the terminal device is a device having a wireless transceiving function or a chip that can be disposed in the device. The device with wireless transceiving function may also be referred to as a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a user agent, or a user equipment. In practical applications, the terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal, an Augmented Reality (AR) terminal, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in city (smart city), a wireless terminal in smart home (smart home), and the like. The embodiments of the present application do not limit the application scenarios. The device with the wireless transceiving function and the chip capable of being arranged in the device are collectively referred to as a terminal device in the present application.
In the embodiment of the present application, the network device may be a wireless access device in various systems, such as an evolved Node B (eNB), a Radio Network Controller (RNC) or a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a home base station (e.g., home evolved Node B or home Node B, HNB), a Base Band Unit (BBU), an Access Point (AP) in a wireless fidelity (WIFI) system, a wireless relay Node, a wireless backhaul Node, a transmission point (TRP or transmission point, TP), and the like, and may also be an NB or a transmission point (TRP or transmission point, TP) in a 5G (nr) system, one or a group of antennas of the 5G system includes multiple antenna panels or panels, but also a network node or the like constituting a gNB or a transmission point.
Referring to fig. 3, a schematic flow chart of a communication method according to an embodiment of the present application is provided.
The method comprises the following steps:
step 301: the network equipment determines synchronization indication information, and the synchronization indication information is used for indicating time synchronization of the terminal equipment.
Step 302: and the network equipment sends the synchronization indication information.
Step 303: the method comprises the steps that terminal equipment receives synchronous indication information from network equipment, and the synchronous indication information is used for indicating the terminal equipment to carry out time synchronization.
Step 304: and the terminal equipment carries out time synchronization according to the synchronization indication information.
In the embodiment of the present application, the synchronization indication information may exist in various forms, which are described below separately.
A first possible implementation: the synchronization indication information includes:
the period information indicates an update period of system time or a synchronization period for indicating the terminal equipment to perform time synchronization; and
offset value information indicating an offset value of a time point of the system time update with respect to a reference time point in a time domain or indicating an offset value of a time point of the terminal device performing time synchronization with respect to the reference time point in the time domain;
update accuracy information of the system time.
The implementation manner of the period information in the synchronization indication information is not limited in this embodiment of the application, and the period information may be a specific value of an update period of the system time, for example, 10 seconds. The period information may also be an index value of an update period of the system time, for example, if the index value of 10 seconds is 01, and if the period information is 01, the update period of the system time is 10 seconds, where a relationship between the update period of the system time and the index value is preset, and is not described herein again. Correspondingly, the implementation manner of the offset value information in the synchronization indication information is not limited in the embodiment of the present application, and the offset value information may be a specific value of the offset value directly or an index value of the indicated offset value. The update precision information may be a specific value of the update precision directly, or may be an index value of the indicated update precision.
In the embodiment of the present application, the update period of the system time, the offset value, and the specific value of the update precision may be determined according to an actual situation, for example, the period of time synchronization performed by the network device, and are not described herein again. If the offset value is 5 slots (slots), in the ith period, the position of the time point of the system time update relative to the reference time point is T i + 5T, T is the period, and T is the duration of one slot. The reference time point may be determined according to actual conditions, for example, a starting point of a radio frame with a System Frame Number (SFN) of 0 is used as the reference time point.
The update precision information in the synchronization indication information may refer to the adjustment precision of the system time in each period, for example, the update precision information is 0.5 μ s, which indicates that if the terminal device does not perform time update in the period, there is a maximum error of 0.5 μ s between the time of the terminal device and the system time.
In this embodiment, the update period of the system time, the offset value indicated by the offset value information, and the update precision unit indicated by the update precision information may also be other units, for example, the period may also use a transmission period of a system information block including the system time as a unit, the offset value may use a subframe as a unit, and the offset value may also be a unit of a number of a system information block where system time update occurs for the first time after a radio frame where SFN is 0, for example, after the radio frame where SFN is 0, the system information block is transmitted three times, and the system time of the system information block transmitted for the third time is updated, the offset value may be 3, and other cases are not described again.
In this embodiment of the present application, in this implementation manner, the synchronization indication information may be sent through a system information block, and optionally, the synchronization indication information may be sent through a system information block including a system time, that is, in step 302, the network device sends the synchronization indication information through the system information block. The system information block may be SIB16, or may be other SIBs, which is not described herein again.
The synchronization indication information is sent through the system information block, so that the terminal equipment can determine the information such as the update period of the system time, and the terminal equipment can determine whether to update the time according to the actual situation.
Specifically, in step 304, the terminal device may determine a difference between the time of the terminal device and the system time according to the period information and the update precision information. And when the terminal equipment determines that the difference value is larger than the threshold value, acquiring system time according to the period information and the deviant, and updating the time of the terminal equipment according to the system time. The threshold is a preset value, and is specifically set according to an actual situation, which is not described herein again.
At this time, in this implementation, the terminal device determines a time point at which the system time update is transmitted every cycle, and update accuracy information, based on the cycle information and the update accuracy information in the synchronization instruction information. The terminal equipment determines that the difference value between the system time and the system time is large according to the threshold value, so that the system information block is monitored and the system time in the system information block is obtained when the time needs to be updated; correspondingly, the terminal equipment determines that the difference value with the system time is small according to the threshold value, and does not need to monitor the system information block when the update time is not needed, so that the power consumption caused by monitoring the system information block every time is avoided.
Further, in this implementation manner, the synchronization indication information may also be sent through Radio Resource Control (RRC) signaling, that is, in step 302, the network device sends the synchronization indication information through RRC signaling, which is not described herein again.
A second possible implementation: the synchronization indication information includes:
the period information indicates an update period of system time or a synchronization period for indicating the terminal equipment to perform time synchronization; and
offset value information indicating an offset value in a time domain of a time point of the system time update with respect to a reference time point or indicating an offset value in a time domain of a time point of the terminal device performing time synchronization with respect to a reference time point.
For the specific contents of the period information, the offset value information, and the reference time point, reference may be made to the above description, which is not repeated herein.
In this implementation, the synchronization indication information may be sent through a system information block or RRC signaling, that is, in step 302, the network device system information block or RRC signaling sends the synchronization indication information.
In this implementation, the synchronization indication information may also be sent through DCI, which is not described herein again.
At this time, in step 304, the terminal device obtains a system time according to the period information and the offset value information, and updates the time of the terminal device according to the system time. Specifically, the terminal device determines the position of the system information block in each period according to the offset value information, and periodically monitors the system information block including the system time according to the period information. And when the terminal equipment monitors the system information block, acquiring the system time in the system information block, and updating the time of the terminal equipment into the acquired system time to update the time of the terminal equipment.
In the method, the terminal equipment only needs to periodically update the time according to the periodic information in the synchronization indication information, so that the periodic time synchronization is realized.
A third possible implementation: the synchronization indication information is a paging message (paging).
When the system time in the system information block sent by the network device jumps, that is, the system time in the system information block is inconsistent with the absolute time due to an error or the like, the network device updates the system time in the system information block to a time consistent with the absolute time, which causes the system time in the system information block to jump. At this time, the network device may send a paging message to the terminal device, where the paging message is used to indicate that system information changes, or to indicate the terminal device to perform system time update, or to indicate the UE to perform system time update.
Further, the synchronization indication information is also used to indicate that the system information block carrying the system time is updated. Or, the synchronization indication information is further used to indicate that the system time in the system information block carrying the system time is updated. For example, in the LTE system, the synchronization indication information is used to indicate that updating occurs in SIB16, or the synchronization indication information is used to indicate that updating occurs in system time in SIB 16.
Further, the synchronization indication information may also carry update accuracy, which indicates the accuracy of the current time update, for example, if the update accuracy is 0.25 μ s, it indicates that a maximum time error of 0.25 μ s exists between the terminal device and the network device if the terminal device chooses not to perform time update.
In this implementation, after receiving the paging message, the terminal device may determine that the system information changes, so as to monitor and receive the system information block, and update the time of the terminal device according to the system time in the system information block.
It should be noted that, in this embodiment of the application, the terminal device may monitor and receive the system information block immediately after receiving the paging message, instead of monitoring and receiving the system information block after waiting for a period of time, for example, the terminal device does not need to start monitoring and receiving the system information block in the next system information window.
Further optionally, the paging message may include the updated system time. At this time, the terminal device may directly update the time of the terminal device according to the updated system time included in the paging message.
Further optionally, the paging message includes a time adjustment amount of the system time. At this time, the terminal device may directly update the time of the terminal device according to the time adjustment amount of the system time included in the paging message.
A fourth possible implementation: the synchronization indication information is Downlink Control Information (DCI) scrambled by a Radio Network Temporary Identity (RNTI), and the RNTI may be a special RNTI, for example, may be an RNTI that is not used in a system and is specifically determined according to an actual situation, and is not described herein again. The network device and the terminal device may agree in advance, and when the DCI is scrambled by using the RNTI, the change of the system information is indicated, and further, the appointment may be made in advance, and when the DCI is scrambled by using the RNTI, the change or the update of the system time is indicated.
Further, the network device and the terminal device may agree in advance, and when DCI is scrambled by an agreed RNTI, the system information block indicating the system time is updated. Or the system time in the system information block carrying the system time is updated, or the terminal equipment is instructed to update the system time.
Further, the synchronization indication information may also carry update accuracy, which indicates the accuracy of the current time update, for example, if the update accuracy is 0.25 μ s, it indicates that a maximum time error of 0.25 μ s exists between the terminal device and the network device if the terminal device chooses not to perform time update.
At this time, after receiving the DCI scrambled by the agreed RNTI, the terminal device determines that the system information changes, thereby monitoring and receiving a system information block, and updates the time of the terminal device according to the system time in the system information block.
Further optionally, the DCI scrambled with the agreed RNTI may include the updated system time. At this time, the terminal device may directly update the time of the terminal device according to the updated system time in the DCI scrambled by the agreed RNTI.
Further optionally, the DCI scrambled by the agreed RNTI includes a time adjustment amount of the system time. At this time, the terminal device may directly update the time of the terminal device according to the time adjustment amount of the system time included in the DCI scrambled by the agreed RNTI.
Further optionally, the DCI scrambled by the agreed RNTI may include downlink resource scheduling information, and the downlink resource scheduled by the downlink resource scheduling information includes updated system time or a time adjustment amount of the system time. At this time, the terminal device may determine the downlink resource scheduling information according to the DCI scrambled by the RNTI, and further determine the updated system time or the time adjustment amount of the system time according to the downlink resource indicated by the downlink resource scheduling information, so as to update the time of the terminal device according to the updated system time.
Further optionally, the network device may further send monitoring indication information to the terminal device, where the monitoring indication information is used to indicate a monitoring period in which the terminal device monitors the DCI. And the terminal equipment periodically monitors the DCI according to the monitoring period indicated by the monitoring indication information, thereby realizing the periodic time updating.
In the embodiment of the present application, an RNTI may also be introduced, where the RNTI is used for scheduling the terminal device. In this embodiment, a common RNTI is configured for terminal devices that need time synchronization or terminal devices that need the same time precision, and the terminal devices share the common RNTI, and downlink resources scheduled by downlink control information scrambled by the common RNTI carry time information update information, optionally, the time information update information may be updated system time or may carry a time adjustment amount of the system time, for example, after the system time of the network device is updated, it is found that the system time needs to be adjusted by +1 μ s, that is, adjusted from 20 μ s to 21 μ s, the network device may notify the updated system time, that is, 21 μ s, to the terminal devices, or may notify the terminal devices of the time adjustment amount of the system time, that is, 1 μ s.
Further, the network device performs time synchronization on system time in system information sent by the network device, and determines an RNTI corresponding to a difference value according to the difference value between the system time before the time synchronization and the system time after the time synchronization; and the network equipment sends the DCI scrambled by the RNTI to terminal equipment.
And after receiving the DCI scrambled by the RNTI, the terminal equipment determines a difference value corresponding to the RNTI, wherein the difference value is the difference value between the system time before time synchronization and the system time after time synchronization. The terminal equipment updates the time of the terminal equipment according to the difference value.
For example, the DCI may be scrambled using different RNTIs to indicate different hopping of the system time, e.g., when the terminal device detects the DCI scrambled with the first RNTI, the system time is considered to hop forward, and further, the hopping granularity is considered to be 1 μ s, so that the time of the terminal device is hopped forward by 1 μ s; when the terminal device detects the DCI scrambled by the second RNTI, it considers that the system time is hopped backwards, and further considers that the hopping granularity is 2 μ s, so as to hop the time of the terminal device backwards by 2 μ s.
Fig. 4 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication apparatus may be configured to perform the actions of the network device in the foregoing method embodiments, where the communication apparatus 400 includes: a processing unit 401 and a transceiving unit 402.
In the embodiment of the present application, when communication apparatus 400 executes the operation of the network device in the flow shown in fig. 3, processing section 401 and transceiver section 402 execute the following steps, respectively:
a processing unit 401, configured to determine synchronization indication information, where the synchronization indication information is used to indicate time synchronization of a terminal device;
a transceiving unit 402, configured to send the synchronization indication information.
In an optional embodiment, the synchronization indication information includes:
the period information indicates an update period of system time or a synchronization period for indicating the terminal equipment to perform time synchronization; and
offset value information indicating an offset value in a time domain of a time point of the system time update with respect to a reference time point or indicating an offset value in a time domain of a time point of the terminal device performing time synchronization with respect to a reference time point.
In an optional implementation manner, the synchronization indication information further includes:
update accuracy information of the system time.
In an optional implementation manner, the transceiver unit 402 is specifically configured to:
transmitting the synchronization indication information through a system information block; or, the synchronization indication information is sent through Radio Resource Control (RRC) signaling.
In an optional implementation manner, the synchronization indication information is a paging message, or the synchronization indication information is downlink control information DCI scrambled by using a radio network temporary identity RNTI.
In an optional implementation manner, the synchronization indication information includes updated system time, or the synchronization indication information includes a time adjustment amount of the system time.
In an optional embodiment, the synchronization indication information is downlink control information DCI scrambled by an RNTI, and the transceiver unit 402 is specifically configured to:
and sending monitoring indication information to the terminal equipment, wherein the monitoring indication information is used for indicating a monitoring period for monitoring the DCI.
In the embodiment of the present application, when communication apparatus 400 executes the operation of the terminal device in the flow shown in fig. 3, processing section 401 and transmitting/receiving section 402 execute the following steps, respectively:
a transceiving unit 402, configured to receive synchronization indication information from a network device, where the synchronization indication information is used to indicate the terminal device to perform time synchronization;
a processing unit 401, configured to perform time synchronization according to the synchronization indication information.
In an optional implementation manner, the processing unit 401 is specifically configured to:
and receiving a system information block according to the synchronization indication information, and updating the time of the terminal equipment according to the system time in the system information block.
In an optional implementation manner, the synchronization indication information is a paging message, or the synchronization indication information is downlink control information DCI scrambled by using a radio network temporary identity RNTI.
In an optional embodiment, the synchronization indication information includes:
the period information indicates an update period of system time or a synchronization period for indicating the terminal equipment to perform time synchronization; and
offset value information indicating an offset value in a time domain of a time point of the system time update with respect to a reference time point or indicating an offset value in a time domain of a time point of the terminal device performing time synchronization with respect to a reference time point.
In an optional implementation manner, the synchronization indication information further includes:
update accuracy information of the system time;
the processing unit 401 is specifically configured to:
and according to the period information and the updating precision information, determining that the difference value between the time of the terminal equipment and the system time is greater than a threshold value, acquiring the system time according to the period information and the deviant information, and updating the time of the terminal equipment according to the system time.
In an optional implementation manner, the synchronization indication information includes updated system time, or the synchronization indication information includes a time adjustment amount of the system time.
In an optional implementation manner, the processing unit 401 is specifically configured to:
when the synchronization indication information comprises the updated system time, updating the time of the terminal equipment according to the updated system time in the synchronization indication information;
or when the synchronization indication information includes the time adjustment amount of the system time, updating the time of the terminal device according to the time adjustment amount of the system time in the synchronization indication information.
Fig. 5 is a schematic structural diagram of a communication device according to an embodiment of the present application. The communication device shown in fig. 5 may be a hardware circuit implementation of the communication device shown in fig. 4. The terminal device may be adapted to the flowchart shown in fig. 1, and perform the functions of the terminal device in the above method embodiment. For ease of illustration, fig. 5 shows only the main components of the communication device. Optionally, the communication device may be a terminal device, or may be a device in the terminal device, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and/or discrete devices. Optionally, taking the communication apparatus as a terminal device as an example, as shown in fig. 5, the communication apparatus 500 includes a processor 501, a memory 502, a transceiver 503, an antenna 504, and an input/output apparatus 505. The processor 501 is mainly used for processing the communication protocol and the communication data, controlling the whole wireless communication device, executing the software program, processing data of the software program, for example, for supporting the wireless communication device to perform the actions described in the above method embodiments. The memory 502 is primarily used to store software programs and data. The transceiver 503 is mainly used for converting baseband signals and radio frequency signals and processing radio frequency signals. The antenna 504 is mainly used for transmitting and receiving radio frequency signals in the form of electromagnetic waves. The input/output device 505, such as a touch screen, a display screen, a keyboard, etc., is mainly used for receiving data input by a user and outputting data to the user.
A transceiver 503, configured to receive synchronization indication information from a network device, where the synchronization indication information is used to indicate the terminal device to perform time synchronization;
and the processor 501 is configured to perform time synchronization according to the synchronization indication information.
In an optional implementation, the processor 501 is specifically configured to:
and receiving a system information block according to the synchronization indication information, and updating the time of the terminal equipment according to the system time in the system information block.
In an optional implementation manner, the synchronization indication information is a paging message, or the synchronization indication information is downlink control information DCI scrambled by using a radio network temporary identity RNTI.
In an optional embodiment, the synchronization indication information includes:
the period information indicates an update period of system time or a synchronization period for indicating the terminal equipment to perform time synchronization; and
offset value information indicating an offset value in a time domain of a time point of the system time update with respect to a reference time point or indicating an offset value in a time domain of a time point of the terminal device performing time synchronization with respect to a reference time point.
In an optional implementation manner, the synchronization indication information further includes:
update accuracy information of the system time;
the processor 501 is specifically configured to:
and according to the period information and the updating precision information, determining that the difference value between the time of the terminal equipment and the system time is greater than a threshold value, acquiring the system time according to the period information and the deviant information, and updating the time of the terminal equipment according to the system time.
In an optional implementation, the processor 501 is specifically configured to:
when the synchronization indication information comprises the updated system time, updating the time of the terminal equipment according to the updated system time in the synchronization indication information;
or when the synchronization indication information includes the time adjustment amount of the system time, updating the time of the terminal device according to the time adjustment amount of the system time in the synchronization indication information.
Fig. 6 shows a schematic diagram of a communication device that can be applied to the method shown in fig. 1. Optionally, the communication device may be a network device, or may be a device in a network device, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and/or discrete devices. Optionally, the communication device is taken as a network device as an example. As shown in fig. 6, the communication device 600 includes a processor 601, a memory 602, a transceiver 603, an antenna 604, and the like.
The communication apparatus 600 may be configured to implement the method of the network device in the foregoing method embodiment, specifically:
a processor 601, configured to determine synchronization indication information, where the synchronization indication information is used to indicate time synchronization of a terminal device;
a transceiver 603 configured to transmit the synchronization indication information.
In an optional embodiment, the synchronization indication information includes:
the period information indicates an update period of system time or a synchronization period for indicating the terminal equipment to perform time synchronization; and
offset value information indicating an offset value in a time domain of a time point of the system time update with respect to a reference time point or indicating an offset value in a time domain of a time point of the terminal device performing time synchronization with respect to a reference time point.
In an optional implementation manner, the synchronization indication information further includes:
update accuracy information of the system time.
In an optional implementation manner, the transceiver 603 is specifically configured to:
transmitting the synchronization indication information through a system information block; or, the synchronization indication information is sent through Radio Resource Control (RRC) signaling.
In an optional implementation manner, the synchronization indication information is a paging message, or the synchronization indication information is downlink control information DCI scrambled by using a radio network temporary identity RNTI.
In an optional implementation manner, the synchronization indication information includes updated system time, or the synchronization indication information includes a time adjustment amount of the system time.
In an optional embodiment, the synchronization indication information is downlink control information DCI scrambled by an RNTI, and the transceiver 603 is specifically configured to:
and sending monitoring indication information to the terminal equipment, wherein the monitoring indication information is used for indicating a monitoring period for monitoring the DCI.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. A method of communication, comprising:
the network equipment determines synchronous indication information, wherein the synchronous indication information is used for indicating the time synchronization of the terminal equipment;
the network equipment sends the synchronization indication information; the synchronization indication information is downlink control information DCI scrambled by a Radio Network Temporary Identifier (RNTI), and the RNTI corresponds to a difference value between system time before time synchronization and the system time after time synchronization.
2. The method of claim 1, further comprising:
and the network equipment sends monitoring indication information to the terminal equipment, wherein the monitoring indication information is used for indicating a monitoring period for monitoring the DCI.
3. A method of communication, comprising:
the method comprises the steps that terminal equipment receives synchronous indication information from network equipment, wherein the synchronous indication information is used for indicating the terminal equipment to carry out time synchronization; the synchronization indication information is downlink control information DCI scrambled by a Radio Network Temporary Identifier (RNTI), and the RNTI corresponds to a difference value between system time before time synchronization and the system time after time synchronization;
and the terminal equipment carries out time synchronization according to the synchronization indication information.
4. The method of claim 3, further comprising:
the terminal equipment receives monitoring indication information from the network equipment, wherein the monitoring indication information is used for indicating the monitoring period of the DCI monitored by the terminal equipment;
and the terminal equipment monitors the DCI according to the monitoring period.
5. A communications apparatus, comprising:
the processing unit is used for determining synchronous indication information, and the synchronous indication information is used for indicating time synchronization of the terminal equipment;
a receiving and sending unit, configured to send the synchronization indication information; the synchronization indication information is downlink control information DCI scrambled by a Radio Network Temporary Identifier (RNTI), and the RNTI corresponds to a difference value between system time before time synchronization and the system time after time synchronization.
6. The communications device according to claim 5, wherein the transceiver unit is specifically configured to:
and sending monitoring indication information to the terminal equipment, wherein the monitoring indication information is used for indicating a monitoring period for monitoring the DCI.
7. A communications apparatus, comprising:
a receiving and sending unit, configured to receive synchronization indication information from a network device, where the synchronization indication information is used to indicate a terminal device to perform time synchronization; the synchronization indication information is downlink control information DCI scrambled by a Radio Network Temporary Identifier (RNTI), and the RNTI corresponds to a difference value between system time before time synchronization and the system time after time synchronization;
and the processing unit is used for carrying out time synchronization according to the synchronization indication information.
8. The communications apparatus according to claim 7, wherein the transceiver unit is specifically configured to:
receiving monitoring indication information from the network equipment, wherein the monitoring indication information is used for indicating the terminal equipment to monitor the monitoring period of the DCI;
and monitoring the DCI according to the monitoring period.
9. A communications apparatus comprising a processor configured to couple to a memory, read and execute instructions in the memory, and to implement the method of any one of claims 1 to 4.
10. A computer-readable storage medium, characterized in that a program or instructions are stored, which, when executed by a computer, performs the method of any one of claims 1 to 4.
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| CN201810903994.6A CN110831144B (en) | 2018-08-09 | 2018-08-09 | Communication method and device |
| PCT/CN2019/099850 WO2020030062A1 (en) | 2018-08-09 | 2019-08-08 | Communication method and apparatus |
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| CN113518421A (en) * | 2020-04-09 | 2021-10-19 | 华为技术有限公司 | Method and device for processing time synchronization message |
| CN113518419B (en) * | 2020-04-09 | 2022-11-22 | 华为技术有限公司 | Method and device for processing time synchronization message |
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