WO2020001367A1 - Time information correction method and device - Google Patents

Abstract

The present application provides a time information correction method and device, the method comprising: a base station determining a time offset preceding and following a clock update, and sending indication information comprising the time offset to a terminal device, wherein, specifically, the base station can configure a reference signal to carry the indication information comprising the target information, for example, using the time offset comprised in the indication information as an input parameter for a generation or resource mapping process of a reference signal sequence, such that the terminal device obtains information regarding the time offset from the received reference signal; and the terminal device performing time information correction according to the time offset. The method can be used to reduce a timing difference between a wireless frame timing system and an external clock timing system, and improve the accuracy of time synchronization between the terminal device and the base station.

Description

Method and device for correcting time information

This application claims the priority of a Chinese patent application filed on June 28, 2018 with the Chinese Patent Office, application number 201810688618.X, and application name "Method and Device for Correcting Time Information", the entire contents of which are incorporated herein by reference. Applying.

Technical field

The present application relates to the field of communications, and more particularly, to a method and apparatus for transmitting time offsets and correcting time information in the field of communications.

Background technique

Wireless communication technology has been widely used in various scenarios. For example, motion control, discrete automation, distributed power system, etc. These new application scenarios have put new demands on communication systems. For example, low-latency and high-reliability communication (URLLC), high connection density (URL), and time synchronization that meet the industrial bus standard IEC61508 of the International Electrotechnical Commission (IEC).

Taking terminal equipment and network equipment as an example, time synchronization means that the time system of the terminal equipment and the network equipment remains synchronized. The time system can be understood as a time system operating in accordance with international standards, such as coordinated universal time (UTC), global navigation satellite system (global navigation satellite system, GNSS), etc., or a time system operating in accordance with private standards, such as a local area network Internally defined time system. In different industrial application scenarios, the accuracy of time synchronization required by terminal equipment is different. For example, special application scenarios such as industrial bus and power grid fault detection require the accuracy of time synchronization between multiple terminal equipment to reach ± 1us. The fifth generation (5G) mobile communication system puts forward a more stringent time synchronization requirement, requiring a time deviation of ± 500ns.

For the base station and the terminal equipment, there are two different timing systems, namely the time system of the clock module and the wireless frame timing system of the communication module. Specifically, for example, the base station includes a clock module and a communication module, and the clock module communicates with an external clock source to obtain time information for correcting the time system of the clock module. The communication module can guarantee the timing synchronization of the radio frames of the terminal equipment within the coverage area of a base station based on the specific radio frame structure and radio frame number. Due to the difference between the communication module and the clock module, there is an amount of time deviation between the wireless frame timing system and the time system of the clock module. As a result, a time deviation occurs during the time synchronization between the terminal device and the base station, which affects the high-precision time. Synchronize. Therefore, how to ensure the accuracy of the time synchronization between the terminal equipment and the base station is a problem that the industry needs to solve urgently.

Summary of the invention

The present application provides a method and device for correcting time information, which can reduce timing errors between a wireless frame timing system and an external clock time system, and improve the accuracy of time synchronization between a terminal device and a base station.

According to a first aspect, a communication method is provided, including: determining a time deviation amount before and after a clock update; and sending instruction information, the instruction information including the time deviation amount information.

Specifically, a time offset is determined, and the time offset is a time offset between the times when a specific event occurs and recorded under different timing systems, that is, the first time recorded based on the first time coordinate system and the second time based The amount of deviation between the second moments recorded in the coordinate system, where the specific event may refer to an unambiguous event that occurs at the sending device, such as the transmission of a specific signal, the transmission of a specific data packet, a specific frame timing trigger, etc .; The first moment is the occurrence time of the specific event in the first time coordinate system, and the second moment is the occurrence time of the specific event in the second time coordinate system, the first time coordinate system and the second time coordinate system Different.

Specifically, the first time coordinate system may be a coordinate system of a time system based on external clock timing, and the second time coordinate system is a coordinate system based on a wireless frame timing system. The time deviation is based on the first time and The timing deviation amount between the second moments based on the radio frame timing system.

In the technical solution provided in this application, the information of the time deviation amount ΔT is sent to the terminal device through the base station, and the terminal device corrects the time information according to the information of ΔT. The base station may send the information of the time deviation amount ΔT between the radio frame timing system and the time system of the external clock to the terminal device. After receiving the information of ΔT, the terminal device corrects the time information according to the information of ΔT, performs addition or subtraction operation on the time information and the time deviation amount, and uses the operation result as new time information. The time information of the terminal equipment can be updated in time to ensure the validity of the time information and reduce the timing error caused by the periodic update of the external clock, thereby improving the accuracy of the time synchronization between the terminal equipment and the base station.

With reference to the first aspect, in some implementation manners of the first aspect, the indication information is carried in a reference signal.

With reference to the first aspect and the foregoing implementation manners, in some possible implementation manners, the sequence of the reference signal is generated according to the time offset amount; or

The sequence of the reference signal is time-frequency resource mapped according to the time offset.

The method of sending the instruction information by using the reference signal can use the unicast or multicast message of the base station to send the instruction information to the terminal device, so that the method of sending the instruction information is more flexible; meanwhile, it can also affect the period of the cell broadcast transmission time information. In the case, the time information of the terminal device is corrected in time to ensure the validity of the reference time, thereby achieving time synchronization with the base station.

With reference to the first aspect and the foregoing implementation manners, in some possible implementation manners, the indication information is carried in downlink control information DCI, a media access control unit MAC CE, or radio resource control RRC signaling.

Through the above-mentioned method for sending instruction information, it is possible to use sufficient existing DCI, MAC, CE, or RRC signaling to send time deviation information to the terminal device; at the same time, update the time information of the terminal device in time to ensure the validity of the reference time, thereby achieving Time synchronization with the base station.

With reference to the first aspect and the foregoing implementation manners, in some possible implementation manners, sending instruction information includes:

When the time deviation is greater than or equal to a preset first threshold, the indication information is sent.

With reference to the first aspect and the foregoing implementation manners, in some possible implementation manners, the method further includes: sending second instruction information, where the second instruction information includes time granularity information for indicating a time deviation amount.

It should be understood that the time granularity may be a type of information used to characterize time units or time accuracy, and the time granularity information may be pre-configured or predefined by a protocol.

After the above technical solution, the base station sends the information of ΔT to the terminal device, and the terminal device corrects the time information according to the information of ΔT. The base station may send the information of the timing deviation amount ΔT accumulated between the radio frame timing system and the time system of the external clock to the terminal device. Specifically, the base station may carry the indication information including the information of ΔT in the reference signal, for example, the time offset contained in the indication information is used as an input parameter of the sequence of generating the reference signal or the resource mapping process, so that the terminal The device obtains the time offset information from the received reference signal; or the base station can send the time offset to the terminal device through DCI, MAC, CE, or RRC signaling. After receiving the instruction information, the terminal device corrects time information according to the obtained ΔT information, performs addition or subtraction operation on the time information and the time deviation amount, and uses the operation result as new time information. The timing error between the wireless frame timing system and the external clock can be reduced, thereby improving the accuracy of time synchronization between the terminal device and the base station.

In a second aspect, a communication method is provided, including: receiving instruction information, the instruction information including information used to indicate an amount of time deviation before and after a clock update; and correcting time information according to the instruction information.

The technical solution provided in this application receives the time deviation information sent by the base station through the terminal device, and corrects the time information according to the information of ΔT, which can update the time information of the terminal device in time, ensure the validity of the reference time, and reduce the external clock cycle The timing error caused by the performance update improves the accuracy of the time synchronization between the terminal device and the base station.

With reference to the second aspect, in some implementation manners of the second aspect, the indication information is carried in a reference signal.

With reference to the second aspect and the foregoing implementation manners, in some possible implementation manners, the sequence of the reference signal is generated according to the time offset amount; or

The sequence of the reference signal is time-frequency resource mapped according to the time offset.

With reference to the second aspect and the foregoing implementation manners, in some possible implementation manners, the indication information is carried in downlink control information DCI, a media access control unit MAC CE, or radio resource control RRC signaling.

With reference to the second aspect and the foregoing implementation manners, in some possible implementation manners, correcting the time information according to the instruction information includes:

Obtaining the amount of time deviation according to the instruction information;

Add or subtract the time information and the time deviation amount, and use the operation result as new time information.

Specifically, the terminal device may modify the time of the time system of the clock module according to the instruction information; or modify the time derived under the wireless frame timing system according to the instruction information; or modify the calculation result in the time synchronization process according to the instruction information .

With reference to the second aspect and the foregoing implementation manners, in some possible implementation manners, the method further includes: sending second instruction information, where the second instruction information includes information used to indicate a time granularity of the time deviation amount.

According to a third aspect, a communication device is provided. The communication device has a function of implementing a network device (for example, a base station) in the method design of the first aspect. These functions can be implemented by hardware, or they can be implemented by hardware to execute corresponding software. The hardware or software includes one or more units corresponding to the functions described above.

According to a fourth aspect, a communication device is provided, and the communication device has a function of implementing a terminal device in the method design of the second aspect. These functions can be implemented by hardware, or they can be implemented by hardware to execute corresponding software. The hardware or software includes one or more units corresponding to the functions described above.

In a fifth aspect, a network device is provided, including a transceiver and a processor. Optionally, the network device further includes a memory. The processor is used to control the transceiver to send and receive signals, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the network device executes the first aspect or any one of the first aspect Method in implementation.

According to a sixth aspect, a terminal device is provided, including a transceiver and a processor. Optionally, the terminal device further includes a memory. The processor is used to control the transceiver to send and receive signals, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the terminal device executes the second aspect or any one of the second aspect. Method in implementation.

According to a seventh aspect, a communication system is provided. The system includes the network device of the third aspect and the terminal device of the fourth aspect; or the system includes the network device of the fifth aspect and the terminal device of the sixth aspect.

According to an eighth aspect, a communication device is provided. The communication device may be a network device designed in the foregoing method, or a chip provided in the network device. The communication device includes a processor coupled to a memory, and may be configured to execute instructions in the memory to implement the first aspect or a method implemented by a network device in any possible implementation manner of the first aspect. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface.

When the communication device is a network device, the communication interface may be a transceiver, or an input / output interface.

When the communication device is a chip configured in a network device, the communication interface may be an input / output interface.

Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

According to a ninth aspect, a communication device is provided. The communication device may be a terminal device designed in the foregoing method, or a chip provided in the terminal device. The communication device includes a processor, which is coupled to the memory and can be used to execute instructions in the memory to implement the method described by the terminal device in the second aspect or any possible implementation manner of the second aspect. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface.

When the communication device is a terminal device, the communication interface may be a transceiver, or an input / output interface.

When the communication device is a chip configured in a terminal device, the communication interface may be an input / output interface.

Optionally, the transceiver may be a transceiver circuit. Optionally, the input / output interface may be an input / output circuit.

According to a tenth aspect, a computer program product is provided. The computer program product includes: computer program code that, when the computer program code runs on a computer, causes the computer to execute the methods in the above aspects.

According to an eleventh aspect, a computer-readable medium is provided. The computer-readable medium stores program code, and when the computer program code runs on a computer, the computer causes the computer to execute the methods in the foregoing aspects.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic architecture diagram of a mobile communication system applicable to an embodiment of the present application.

FIG. 2 is a schematic diagram of an example of time synchronization between a base station and a terminal device according to an embodiment of the present application.

FIG. 3 is a timing diagram of two types of time reference frames provided by an embodiment of the present application.

FIG. 4 is a schematic diagram of fluctuations of deviations under two types of time reference frames provided by an embodiment of the present application.

FIG. 5 is a schematic diagram of a method for correcting time information according to an embodiment of the present application.

FIG. 6 is a schematic diagram of an example resource mapping method for a reference signal according to an embodiment of the present application.

FIG. 7 is a schematic diagram of an example communication device according to an embodiment of the present application.

FIG. 8 is a schematic diagram of another example communication device according to an embodiment of the present application.

FIG. 9 is a schematic diagram of an example of a network device according to an embodiment of the present application.

FIG. 10 is a schematic diagram of another example of a terminal 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.

The technical solutions in the embodiments of the present application can be applied to various communication systems, such as: a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, and an LTE time division duplex (LTE time division duplex). (TDD), 5th generation (5G) mobile communication system or new wireless (NR) communication system, and future mobile communication system.

FIG. 1 is a schematic architecture diagram of a mobile communication system applicable to an embodiment of the present application. As shown in FIG. 1, the mobile communication system 100 may include a radio access network device 110 and at least one terminal device (such as the terminal device 120 and the terminal device 130 in FIG. 1). The terminal device is wirelessly connected to the wireless access network device. Terminal equipment can be fixed or removable. FIG. 1 is only a schematic diagram. The communication system may further include other network devices, such as wireless relay devices and wireless backhaul devices, which are not shown in FIG. 1. The embodiments of the present application do not limit the number of radio access network devices and terminal devices included in the mobile communication system.

In the mobile communication system 100, the radio access network device 110 is an access device that the terminal device accesses to the mobile communication system through wireless means. The radio access network device 110 may be: a base station, an evolved base station (eNB), a home base station, an access point (AP) in a wireless fidelity (WIFI) system, and A relay node, a wireless backhaul node, a transmission point (TP), or a transmission and reception point (TRP), etc., can also be a gNB in an NR system, or it can be a component or part of a base station. Equipment, such as a central unit (CU), a distributed unit (DU), or a baseband unit (BBU). It should be understood that, in the embodiments of the present application, specific technologies and specific device forms adopted by the wireless access network device are not limited. In this application, the wireless access network device is referred to as a network device. Unless otherwise specified, in this application, the network device refers to a wireless access network device. In this application, a network device may refer to the network device itself, or a chip applied to a network device to perform a wireless communication processing function.

The terminal equipment in the mobile communication system 100 may also be referred to as a terminal, a user equipment (UE), a mobile station (MS), a mobile terminal (MT), and the like. The terminal device in the embodiment of the present application may be a mobile phone, a tablet, a computer with a wireless transmitting and receiving function, or may be applied to virtual reality (VR), augmented reality (AR) ), Industrial control (industrial control), driverless (self driving), remote medical (remote medical), smart grid (grid), transportation safety (transportation safety), smart city (smart city) and smart home (smart home) ) And other scenarios. In the present application, the aforementioned terminal devices and chips applicable to the aforementioned terminal devices are collectively referred to as terminal devices. It should be understood that the embodiment of the present application does not limit the specific technology and specific device form used by the terminal device.

The network device 110 in FIG. 1 may serve as a centralized controller for the terminal devices 120 and 130, and provide a time synchronization source for the terminal devices 120 and 130, that is, send time information to the terminal devices 120 and 130, so that the terminal devices 120 and 130 in the cell and The network device 110 maintains time synchronization and indirectly meets the time synchronization requirement between the terminal devices 120 and 130. It should be understood that in the embodiments of the present application, a base station is used as a network device, and time synchronization between the base station and a terminal device is taken as an example for detailed description. That is, a base station is used as a master clock node, and a terminal device is used as a slave clock node For description, it can be understood that the method in the embodiment of the present application can also be used in a more diverse network topology structure. In addition to the time synchronization between the base station and the terminal device, it can also be applied to other application scenarios, such as device-to-device (D2D) application scenarios involving time synchronization. At this time, the master clock node is a terminal device, and The clock node is also a terminal device, and the method in the embodiment of the present application may also be used to implement time synchronization. This application is not limited to this.

In the time synchronization process, the base station may periodically send time information to the terminal device through a system information block (SIB), for example, may send time information through SIB 16. In the embodiment of the present application, the time information of the time system of the external clock of the base station is represented as T _ref , and T _ref may represent a specific point in time during the operation of the base station (for example, the start or end boundary of the SI window where the SIB16 message is located). The indicated time information, and T _ref is the timing under the time system of the clock module of the base station. It should be understood that T _ref may be time information of UTC and GNSS, or time information operating according to a private standard, such as time information defined within a local area network. This application includes but is not limited to this.

In the current LTE, the granularity of the system message sent by the base station is 10 milliseconds (ms), and the configurable sending period is 80 ms to 5120 ms. However, as described in the background technology, different application scenarios may require different terminal devices with different time synchronization accuracy and different time synchronization cycles. Therefore, this time synchronization method of sending time information through system messages cannot target different terminals. Equipment needs to provide high-precision time synchronization services.

At present, the Institute of Electrical and Electronics Engineers (IEEE) 1588 protocol defines a precision time protocol (PTP). Its basic function is to enable distributed communication networks to have strict timing synchronization. , The function of time synchronization can be achieved by means of application layer data packet interaction. In practical applications, IEEE1588 is a master-slave synchronization system, which can be equivalent to a master clock node as a cell base station and a slave clock node as a terminal device. For example, during the time synchronization process between the base station and the terminal device, the base station periodically issues sync messages to the terminal device, and simultaneously records the time T ₁ at which the base station sends the sync message, and sends the time stamp information including T ₁ to the terminal. Device; the terminal device obtains the relevant synchronization message and timestamp information T ₁ through the message interaction with the base station, and records the time T ₂ when the sync message is received; the terminal device sends a delay response message to the base station And records the time T ₃ when the delay response message is sent; the base station records the time T ₄ when the delay response message is received, and sends the time stamp information including T ₄ to the terminal device. After packet exchange process described above, the terminal device to obtain a _{T 1, 2, T 3,} T T ₄ to time information, and according to _1, T _{2, 3} between time T ₄ of the terminal apparatus and the base station computing T T, Offset or delay. Specifically, it can be calculated by formulas (1-a) and (1-b).

Or calculate the wireless signal transmission time between the base station and the terminal, the specific calculation formula is as follows

Among them, offset is used to indicate the time deviation between the terminal device and the base station, that is, the time deviation between the master clock node and the slave clock node; delay is used to indicate the transmission time deviation of the wireless signal from the base station to the terminal device. The terminal device can adjust the time information of the terminal device according to the calculated offset or delay to achieve time synchronization with the base station. The above process is a time synchronization scheme designed for the application layer of the wired system. For future industrial control systems using wireless communication systems, in order to provide high-precision time synchronization services, wireless communication systems need to introduce the time synchronization technology in the IEEE1588 protocol.

In a wireless system, when using the time synchronization technology in the IEEE1588 protocol for high-precision time synchronization, the terminal needs to obtain the time information of the sending time T ₁ of the sync message for each synchronization process. It should be understood that T ₁ here is relative to T _ref , the base station records the moment of sending the sync message.

In LTE, the time information T _ref of the time system of the base station is carried in SIB 16, but SIB 16 is a broadcast message, and the sending time of SIB 16 cannot be directly used as the time T ₁ when a sync message is sent to a specific terminal. The terminal device can derive T ₁ according to T _ref and the radio frame timing. In order to distinguish this application, the sending time of the derived synchronization message is denoted as T ₁ ′, that is, the time information T _ref of the time system of the base station clock module is _regarded as wireless. The time reference point of the frame is obtained by formula (2) T ₁ ′.

T ₁ ′ = T _ref + n × t; ............................................ ······························ (2)

Among them, T _ref is the time information of the reference point under the time system of the clock module, n is the number of time units from the reference point at the time of transmission, n is a positive integer, n can be predefined by the system or protocol, and n can also be The terminal device is configured by the base station through high-level signaling; or n may also be notified to the terminal device by the base station through physical layer signaling. In this application, the physical layer signaling may be downlink control information (DCI). This application does not limit the manner of obtaining n. t is the length of time corresponding to a time unit. In the present application, the time unit may be a radio frame, or a subframe, or a time slot, or an orthogonal frequency division multiplexing (OFDM) symbol. One radio frame corresponds to 10 ms, one subframe corresponds to 1 ms, and one LTE time slot corresponds to 0.5 ms. The length of an NR time slot is determined by the subcarrier interval, which is not limited in this application. In NR, T _ref can be carried in a system broadcast message or in a multicast or unicast message.

It should be understood that recording the moment when the base station sends the sync message is equivalent to recording the moment corresponding to the start boundary or the end boundary of the time unit corresponding to the sync message. Similarly, the moments when a base station sends a signal, or when a terminal device sends or receives a signal, are recorded using this standard. Here, the time corresponding to the start or end boundary of the time unit corresponding to the sync message can be understood as the time corresponding to the start subframe, start slot, or start symbol, or the end subframe, end slot. Or the moment corresponding to the end symbol. This application is not limited to this.

In theory, if the derived transmission time T ₁ ′ of the sync message is consistent with the time information T ₁ of the time system of the base station, then T ₁ ′ can be used to calculate the offset according to formula (1-a), or according to formula (1 -b) to calculate the delay, and correct the time information of the terminal device according to the offset or delay, so as to achieve time synchronization with the base station. However, in practical applications, there is a certain deviation between T ₁ ′ and T ₁ , which is denoted as ΔT = T ₁ -T ₁ ′. The cause of the deviation ΔT between T ₁ ′ and T ₁ is analyzed below.

FIG. 2 is a schematic diagram of time synchronization between a base station and a terminal device in a wireless communication system. As shown in FIG. 2, the base station includes at least two modules, an external clock module 201 and a communication module 202. The external clock module 201 of the base station can communicate with an external clock source and periodically obtain time information from an external clock source, such as time information of UTC or GNSS, or time information of a time system running by a private standard, used to calibrate the time of the base station. System time information. The terminal device also includes two modules, a clock module 203 and a communication module 204. Among them, the clock module 203 cannot directly obtain the time information of the external clock, and needs to communicate with the communication module 202 of the base station through the communication module 204, and further based on the external of the base station. The time information of the time system of the clock module 201 performs time synchronization. The communication module 202 of the base station and the communication module 204 of the terminal device can communicate based on a typical communication protocol, for example, based on the 3rd Generation Partnership Project (3GPP) protocol for communication.

It can be known from the above description that there are two timing systems in the base station, one is an external clock time system, which performs timing according to a time system defined by an international standard, or performs timing according to a time standard defined by a local area network; and one is a wireless frame timing system. It is timed according to the radio frame number, time slot number, etc. These two timing systems run on their own hardware modules, and there will inevitably be differences between the two. Specifically, the calibration of the external clock module 201 of the base station will cause a jump of the order of 100 nanoseconds (ns), and the radio frame of the radio frame timing system of the communication module 202 of the base station will always change continuously. As time goes on, the amount of deviation between the two timing systems will continue to accumulate.

In addition, since the sampling circuits of the external clock module 201 and the communication module 202 of the base station can be independent of each other, the sampling frequency of the time system of the external clock and the sampling frequency of the wireless frame timing system of the communication module are also different. In the 3GPP technical specification (TS) 36.104, the carrier frequency error requirement of the transmitted signal is specified to not exceed ± 0.1 ppm. Similarly, assuming that the sampling frequency of the base station and the external clock frequency also have the same error requirement of ± 0.1ppm, the frequency error range of the external clock module and the communication module should be within ± 0.2ppm. As time goes on, the timing deviation caused by the frequency error will continue to increase.

In addition, as shown in FIG. 3, if the time granularity of the time system of the external clock module and the wireless frame timing system are different, for example, the wireless frame length of the wireless communication system is 10ms, and the external clock observation result on the wireless frame may be 10ms ± 2ns . As time goes on, the timing deviation caused by the difference in time granularity will continue to increase.

In this application, the timing system using an external clock is referred to as the time system of the clock module, and the timing system of the 3GPP communication system is referred to as the wireless frame timing system. It can be seen that the sending time T ₁ of the sync message derived by formula (2) ′ Is the timing result of the wireless frame timing system. The sending time T ₁ of the sync message recorded by the base station is the time recorded by the time system based on the clock module. There is a certain deviation between T ₁ ′ and T ₁ .

FIG. 4 is a schematic diagram of fluctuations in timing deviation between a time system of an external clock of a base station and a radio frame timing system. As shown in FIG. 4, the horizontal axis represents the time of the radio frame timing of the base station, and the vertical axis represents the deviation ΔT = T ₁ -T ₁ ′ of the two timing systems of the base station. The black solid line that rises upward indicates the amount of deviation caused by the frequency error Cumulatively, the step change of the solid black line indicates the change of the time deviation caused by the periodic calibration update of the time system of the base station and the external clock.

From the above analysis, it can be known that due to the time deviation ΔT between T ₁ ′ and T _1, there is a time between the time when the sync message is sent by the terminal device (T ₁ ′) and the actual time when the sync message is sent (T ₁ ). There is a certain error, and the error keeps increasing with the increase of time, which causes the terminal equipment and the base station to fail to maintain time synchronization accurately. For high-precision time synchronization services, the time deviation from the time of the clock system's time system must be within ± 500ns. Therefore, this application provides a method for correcting time information. A base station determines a time offset ΔT of a wireless frame timing system and an external clock time system, and sends the time offset ΔT to a terminal device, and the terminal device corrects the time according to ΔT. Information, timely update time information, and achieve time synchronization with the base station.

FIG. 5 is a schematic diagram of a method for correcting time information according to an embodiment of the present application. Taking the base station as the master clock node and the terminal device as the slave clock node, each step of the method 500 will be described in detail. It can be understood that the master clock node and the slave clock node may also be other communication devices, for example, the master clock node and the slave clock node may be different terminal devices.

It should be understood that, in the embodiment of the present application, the method 500 is described by using a terminal device and a base station as execution subjects. By way of example and not limitation, the execution body of the method 500 may also be a chip applied to a terminal device and a chip applied to a base station.

S501. The base station determines a time deviation amount before and after the clock is updated.

Specifically, the amount of time deviation is the amount of deviation between the moments of the occurrence of a specific event under different timing systems, that is, the first moment recorded based on the first time coordinate system and the second moment recorded based on the second time coordinate system. The amount of deviation between times, where a specific event may refer to an unambiguous event that occurs at the base station, such as the transmission of a specific signal, the transmission of a specific data packet, the timing trigger of a specific frame (such as an empty frame), etc. It is the occurrence time of the specific event in the first time coordinate system, and the second time is the occurrence time of the specific event in the second time coordinate system, and the first time coordinate system is different from the second time coordinate system.

Specifically, the first time coordinate system may be a coordinate system based on a time system of an external clock module, and the second time coordinate system may be a coordinate system based on a wireless frame timing system. The time offset is a second time frame based on the wireless frame timing system. The timing offset between the time and the first time based on the external clock.

It should be understood that, using T _ref as a reference time, the base station sends a first downlink signal to the terminal device, and records that the sending time of the first downlink signal is T ₁ . It can be understood that T ₁ is the sending time of the first downlink signal in the first time coordinate system, T ₁ ′ is the sending time of the first downlink signal in the second time coordinate system, and the first time coordinate system and the second time coordinate The system is different, resulting in a deviation between T ₁ and T ₁ ′.

In addition, the sending of T _ref can reuse the existing messages of the protocol, for example, using SIB 16 for sending; or using other radio resource control (RRC) messages, which is not limited in this application. Specifically, if the reference time T _ref is sent through the SIB 16, the reference time T _ref is the time when the end frame boundary of the system information (SI) window of the SIB 16 sent by the base station reaches the transmitting antenna port. In addition, the base station may send T _ref periodically. Specifically, if the reference time information is sent through the SIB 16, the sending period may be 80 ms to 5120 ms. It should be understood that the first downlink signal here is a signal sent by the base station for the terminal device, such as a synchronization signal, a reference signal, a data message, and other forms. The form of the first downlink signal is not limited in this application.

The base station transmits a first downlink timing signal to the terminal device at time T _1, respectively, the first terminal device receives a downlink signal transmitted from the base station, the terminal device may record the received first downlink signal T _2. It should be understood, where a first downlink transmission timing signal T ₁ is a base station for an external system clock time (a first time frame) as a reference time of the record; Similarly, the terminal apparatus receives the downlink signal of the first time T ₂ is also the time recorded based on the time system of the clock module of the terminal device.

It should be understood that, based on the 3GPP wireless frame timing system, the base station and the terminal device can know the time when the first downlink signal is transmitted, and the transmission time of the derived first downlink signal is recorded as T ₁ ′ as described above. From the formula (2), T ₁ ′ = T _ref + n × t is known.

In S501, the base station records the transmission times T ₁ and T ₁ ′ of the first downlink signal, so that the time deviation amount ΔT = T ₁ -T ₁ ′ can be determined.

For example, suppose the reference point time T _ref is 10 ms, and the sending time T ₁ in the first time coordinate system is recorded as 12.001 ms. In the wireless frame timing system, the first downlink signal is transmitted after 2 subframes, and each subframe time If the length is 1 ms, the base station records T ₁ ′ = T _ref + n × t = 10 ms + 2 × 1 ms = 12 ms in the second time coordinate system, that is, T ₁ ′ is 12 ms. The base station can determine the time deviation ΔT = T ₁ -T ₁ ′ = 0.001 ms at this time.

It should be understood that based on the foregoing analysis of the errors in the two time reference coordinate systems, it can be known that ΔT includes an accumulated time deviation amount caused by an external clock module jump variable and a clock frequency deviation.

It should also be understood that when the base station is in the working state but does not send the first downlink signal, the base station can use a certain point as a reference point, and note that the time of this point in the clock module's time system is T ₁ , corresponding to the radio frame timing. The time in the system is T ₁ ′, and the time deviation amount ΔT = T ₁ -T ₁ ′ is determined.

It should also be understood that when determining the time deviation amount ΔT, the time information T _ref of the time system of the clock module of the base station at the latest reference point may be used as a reference for calculation; or after the latest time deviation amount ΔT ^{old is} corrected Time information

Calculate the amount of time deviation this time as a reference point time reference. Specifically can be based on

Calculate the amount of time deviation this time. Current time information

When the accuracy is not high, you can use ΔT ^old

High-precision information. For example, when

When carried in the SIB16 message, the SIB16 message indicates

The accuracy is on the order of 10ms, and the time deviation represented by ΔT ^old is 0.001ms, which can be corrected according to ΔT ^old

New

It is 10.001ms. Here, ΔT ^{old is taken} as

High-precision part of the time information.

S502. The base station sends instruction information, where the instruction information includes information used to indicate the time deviation amount.

Specifically, the base station sends the indication information including the information of the time deviation amount to the terminal device, the terminal device receives the indication information, and determines the time deviation amount by using the indication information.

Optionally, the base station sends second instruction information, and the second instruction information includes information used to indicate a time granularity of the time deviation amount.

It should be understood that the time granularity may be a type of information used to characterize time units or time accuracy, and the time granularity information may be pre-configured or predefined by a protocol. For example, the base station and terminal equipment agree in advance that the time deviation is calculated with a granularity of 100ns. Or, the time granularity information may be dynamically configured, and the time granularity may be dynamically adjusted as needed. Such a configuration method may save bit overhead.

It should also be understood that the second instruction information herein may be a part of the foregoing information indicating the time deviation amount, or may be sent separately from the foregoing instruction information.

The following describes two ways to send the instruction information.

method one

The indication information is carried in a reference signal.

Optionally, the reference signal may be multiplexed with an existing downlink reference signal, or a dedicated reference signal may be used. For example, cell-specific reference signals (CRS), demodulation reference signals (DMRS), multicast single frequency reference signals (multimedia, broadcast, service, single frequency, network reference signal, MBSFN, RS), positioning Reference signals (positioning reference signals, PRS), and channel state information reference signals (channel reference information, CSI-RS). The application does not limit the type of the reference signal.

It should be understood that the instruction information includes information used to indicate the amount of time deviation. To implement sending the instruction information to the terminal device, the time deviation included in the instruction information can be used as a reference signal generation or resource mapping process. Input parameters, so that the terminal device obtains information on the amount of time deviation from the received reference signal. The following specifically enumerates three methods for carrying the indication information in a reference signal and sending the indication information to a terminal device.

(1) Generation of reference signal sequence

Optionally, the sequence of the reference signal is generated based on the amount of time deviation.

Specifically, the time deviation amount may be a parameter of a sequence generation function of the reference signal. It should be understood that it is necessary to realize that the time deviation amount is involved in the sequence of generating the reference signal, that is, the time deviation amount is involved in the calculation process of the sequence generation. The base station can select the generation of the reference signal sequence r (m) according to the time offset, such as

r (m) = x _seq (m; [ΔT / L]); ................................. ·············· (3)

Among them, L is the granularity of the time deviation, m is the index of the element in the sequence, x _seq represents the function of generating the sequence of the reference signal, and [ΔT / L] represents the function of rounding ΔT based on the granularity L. The rounding method is possible But it is not limited to rounding down, rounding up or rounding.

Optionally, the base station may further perform phase rotation processing on the sequence of the reference signal according to the time deviation amount as shown in formula (4).

Among them, r (m) is the sequence of the original reference signal, r '(m) is the sequence of the reference signal after phase rotation processing; m represents the index of the element in the sequence; α and C are fixed constants, which are defined by the protocol, and N Fast Fourier transform (FT) size.

(2) The mapping process of the reference signal sequence

Optionally, the sequence of the reference signal is time-frequency resource mapped according to the time offset. Specifically, corresponding processing can be performed according to formula (5).

a _{k, l} = βr (m); ................................................................. ············ (5)

Where k = f _mapping (m; ΔT) and / or l = g _mapping (m; ΔT). a _{k, l} represents the content carried on the k-th resource element (RE) on the l-th symbol; β is a constant, which indicates the power level; f _mapping (m; ΔT) and g _mapping (m; ΔT) Is a function of resource mapping, and the time offset is a parameter in the mapping function.

As shown in FIG. 6, the reference signal carrying the indication information may be time-division multiplexed or frequency-division multiplexed with other reference signals.

Or, the RS used to carry ΔT occupies a part of resources of other reference signals, so that ΔT is transmitted to the terminal device. For example, the other reference signals herein may be tracking reference signals (TRS).

It should be understood that the resource mapping method is not limited in this application. For any of the resource mapping methods described above, the terminal device may use a corresponding detection algorithm to obtain the time included in the indication information when receiving the RS bearing the ΔT. The amount of deviation.

The above two methods can be used to carry the indication information into the reference signal. Whether the sequence of the reference signal is generated based on the time offset, or the time-frequency resource mapping is performed based on the time offset, after the terminal device receives the reference signal, The instruction information can be obtained by detecting the reference signal, so as to determine the amount of time deviation.

The method of transmitting the information including the amount of time deviation by using the reference signal can use the multicast message of the base station to send the instruction information to the terminal device, so that the method of transmitting the instruction information is more flexible; meanwhile, it can also affect the period of the cell broadcast transmission time information. In the case of time, correct the time information of the terminal device in time to ensure the validity of the reference time, thereby achieving time synchronization with the base station.

Way two

In another possible implementation manner, the instruction information is carried in downlink control information DCI, a medium access control unit (MAC, CE), or radio resource control RRC signaling.

It should be understood that, by using the above three types of messages to carry the time deviation information, the required response time is sequentially increased. Specifically, for example, the response time required for DCI to carry ΔT information is the shortest, and the response time required for RRC signaling to carry ΔT information is the longest; and for the degree of protocol modification, DCI to carry ΔT information is The degree of modification is the largest, and the information carried by RRC signaling carries the smallest degree of modification to the protocol. Therefore, in the actual application process, considering the timeliness of the time offset and the degree of modification to the protocol, it can be considered to send the time offset by using MAC CE.

Through the above-mentioned method for sending instruction information, DCI, MAC, CE, or RRC signaling can be used to send the time offset information to the terminal device, thereby improving the accuracy of time synchronization between the terminal device and the base station.

The above describes the types used to carry the instruction information, and then there may be multiple possible situations for sending the instruction information, or sending the instruction information. Specifically enumerate the following three possible situations.

(1) Send periodically

The base station may send the instruction information to the terminal device periodically. For example, a certain transmission period may be configured for the base station, or the base station may select an appropriate detection period in combination with its own hardware conditions, and periodically send indication information including a time deviation amount to the terminal device.

It should be understood that the period at which the base station detects the time offset and sends the time offset may be different. For example, the base station may detect the time deviation amount at a predetermined time, but the time deviation amount is transmitted according to a certain period, which is not limited in this application.

(2) Signaling

In a possible manner, the base station may notify the terminal device to start receiving the instruction information through high-level signaling, and the terminal device receives the instruction information according to a pre-configured period; the base station may also notify the terminal device to stop receiving the instruction information through high-level signaling. The high-level signaling can reuse the activation message and the deactivation message of the time synchronization function, respectively.

(3) Dynamic trigger

In another possible manner, when the time deviation is greater than or equal to a preset first threshold, the base station sends the indication information to the terminal device.

Specifically, the base station dynamically selects whether to send the indication information according to the size of ΔT: the base station determines a first threshold. When the value of ΔT is greater than or equal to the first threshold, that is, the time synchronization result may not meet the current demand, the base station sends ΔT The information is used for the terminal device to correct the time information. It should be understood that the first threshold may be a constant preset by the protocol, or a constant determined by a time synchronization accuracy requirement.

S503. The terminal device corrects time information according to the instruction information.

Specifically, after receiving the instruction information, the terminal device corrects the time information according to the instruction information. The terminal device may obtain a time offset according to the instruction information; perform addition or subtraction operations on the time information and the time offset, and use the operation result as new time information.

Optionally, the terminal device can implement the connection with the base station by modifying the time information of the time system, or correcting the downlink signal transmission time calculated by the wireless frame timing system, or modifying the calculation result of the foregoing formula (1-a) or (1-b). Time synchronization. Listed as follows:

(1) The terminal device corrects the time of the time system of the clock module

The terminal device corrects the time information of the reference point of the time system of the clock module according to the time deviation amount. For example, the terminal device may modify the time information T _{ref of the} time system according to ΔT, and may modify it according to formula (6).

The terminal device will

Time information as a new reference point for the time system of the clock module.

It is the time information of the reference point of the time system of the clock module transmitted by the latest base station.

(2) The terminal equipment corrects the downlink signal transmission time calculated under the wireless frame timing system

The terminal device corrects the time of the wireless frame timing system according to the amount of time deviation. For the first downlink signal, it is to modify the time of the estimated transmission time of the first downlink signal. Specifically, the terminal device may modify the sending time T ₁ ′ of the first downlink signal timed in the wireless frame timing system according to formula (7),

among them,

It is the time of the radio frame timing system after correction, and the time of the radio frame timing system before correction at T ₁ ′. Will be corrected

As T ₁ , the offset is calculated according to formula (1), or the delay is calculated according to formula (1-b), so as to further complete the time synchronization process.

(3) Correct calculation results during time synchronization

The terminal device corrects the time synchronization calculation result according to the time deviation amount. For example, after receiving the instruction information, the terminal device first saves the obtained time deviation amount ΔT, and after obtaining the time information of T ₃ and T ₄ , adds ΔT as correction information directly to the time synchronization calculation formula. Specifically, during the time synchronization between the terminal device and the base station, the terminal device can calculate the time offset offset according to formulas (1-a) and (2), taking into account the effect of the time offset amount ΔT, and then correct the offset according to ΔT. Specifically passed

Make corrections, and perform time synchronization between the terminal device and the base station according to [offset] _modify .

In addition, delay can be understood as [offset] _{modify to} advance or lag the time deviation of the time system of the terminal device clock module. Specifically, the terminal device may delay the signal transmission delay time calculated according to formulas (1-b) and (2), and consider the influence of the time deviation ΔT, and then modify the delay according to ΔT.

Make corrections. Therefore, according to [delay] _modify and formula (2), the time displayed by the time system of the base station when the downlink signal reaches the terminal device can be obtained as T _{2, gNB} = T ₁ + [delay] _modify , and the terminal device resets the terminal according to T _{2, gNB.} The time system of the device.

It should be understood that this application does not limit the manner in which the terminal device modifies the time information of the wireless frame timing system according to ΔT. The purpose is to allow the terminal device to update the time information through the correction of ΔT to avoid the external clock module jumping and clock frequency deviation. The resulting cumulative time deviation affects time synchronization, thereby achieving time synchronization between the terminal device and the base station.

In addition, to perform time correction according to the time synchronization technology such as formula (1) in the IEEE1588 protocol, in addition to obtaining the time T ₁ for sending a synchronization message as described in the embodiment of the present application, T ₂ , T _3, and T are required. ₄ time information. Among them, T ₂ is the time when the terminal device receives the synchronization message, and T ₃ is the time when the terminal device sends a delay response message. Both of these time information are clearly known by the terminal device. The time information of T ₄ is sent by the base station to the terminal device, and there may be multiple transmission forms, which are not listed here one by one. For example, the base station records the time T ₄ when the terminal device receives the delay response message, and sends T ₄ to the terminal device by using the method of sending ΔT listed in the embodiments of the present application.

After the method for sending information including ΔT and correcting time information provided by the embodiment of the present application, the ΔT information is sent to the terminal device through the base station, and the terminal device corrects the time information according to the ΔT information. The base station may send the information of the timing deviation amount ΔT accumulated between the radio frame timing system and the time system of the external clock to the terminal device. Specifically, the base station may carry the indication information including the information of ΔT in the reference signal, for example, the time offset contained in the indication information is used as an input parameter of the sequence of generating the reference signal or the resource mapping process, so that the terminal The device obtains the time offset information from the received reference signal; or the base station can send the time offset to the terminal device through DCI, MAC, CE, or RRC signaling. After receiving the instruction information, the terminal device corrects time information according to the obtained ΔT information, performs addition or subtraction operation on the time information and the time deviation amount, and uses the operation result as new time information. The timing error between the wireless frame timing system and the external clock can be reduced, thereby improving the accuracy of time synchronization between the terminal device and the base station.

The method for correcting time information in the embodiments of the present application has been described in detail with reference to FIGS. 2 to 6 above. Hereinafter, the apparatus for correcting time information according to the embodiment of the present application will be described in detail with reference to FIGS. 7 to 10.

FIG. 7 shows a schematic block diagram of a communication apparatus 700 according to an embodiment of the present application. The apparatus 700 may correspond to (for example, be applicable to or be itself) the base station described in the method 500, and each module in the apparatus 700 The OR units are respectively used to perform various actions or processing processes performed by the base station in the above method 500. As shown in FIG. 7, the communication device 700 may include a processing unit 710 and a communication unit 720.

The processing unit 710 is configured to determine a time deviation amount before and after the clock is updated.

The communication unit 720 is configured to send instruction information, and the instruction information includes information used to indicate the amount of time deviation.

Specifically, the processing unit 710 is used to execute S501 in method 500, and the communication unit 720 is used to execute S502 in method 500. The specific process of each unit performing the above corresponding steps has been described in detail in method 500. For simplicity, in I won't go into details here.

FIG. 8 shows a schematic block diagram of a communication apparatus 800 according to an embodiment of the present application. The apparatus 800 may correspond to (for example, be applicable to or be itself) the terminal device described in the method 500, and each of the apparatus 800 The modules or units are respectively used to perform various actions or processing processes performed by the terminal device in the above method 500. As shown in FIG. 8, the communication device 800 may include a communication unit 810 and a processing unit 820.

The communication unit 810 is configured to receive instruction information that includes information used to indicate an amount of time deviation before and after a clock update.

The processing unit 820 is configured to correct the time information according to the instruction information.

Specifically, the communication unit 810 is used to execute S502 in method 500, and the processing unit 820 is used to execute S503 in method 500. The specific process of each unit performing the above corresponding steps has been described in detail in method 500. For simplicity, in I won't go into details here.

FIG. 9 is a schematic structural diagram of a communication device 900 according to an embodiment of the present application. As shown in FIG. 9, the communication device 900 (for example, a base station) includes a processor 910 and a transceiver 920. Optionally, the communication device 900 further includes a memory 930. Among them, the processor 910, the transceiver 920, and the memory 930 communicate with each other through an internal connection path to transfer control and / or data signals. The memory 930 is used to store a computer program, and the processor 910 is used to call from the memory 930. The computer program is run to control the transceiver 920 to send and receive signals.

The processor 910 is configured to execute a program code stored in the memory 930 to implement a function of a base station in the foregoing method embodiment. In specific implementation, the memory 930 may also be integrated in the processor 910, or be independent of the processor 910. The transceiver 920 may be implemented by means of a transceiver circuit.

The above communication device 900 may further include an antenna 940 for sending downlink data or downlink control signaling output by the transceiver 920 through a wireless signal, or sending uplink data or uplink control signaling to the transceiver 820 for further processing after receiving.

It should be understood that the communication device 900 may correspond to a base station in the method 500 according to the embodiment of the present application, and the device 900 may also be a chip or a component applied to a base station. In addition, each module in the device 900 implements the corresponding process in the method 500 in FIG. 5. Specifically, the memory 930 is used to store program code, so that the processor 910 controls the processor 910 to execute the program code when the program code is executed. The S501 in the method 500 is executed, and the transceiver 920 is used to perform the S502 in the method 500. The specific process for each unit to perform the above corresponding steps has been described in detail in the method 500. For the sake of brevity, no further description is provided here.

FIG. 10 is a schematic structural diagram of a communication device 1000 according to an embodiment of the present application. As shown in FIG. 10, the communication device 1000 includes a processor 1010 and a transceiver 1020. Optionally, the communication device 1000 further includes a memory 1030. Among them, the processor 1010, the transceiver 1020, and the memory 1030 communicate with each other through an internal connection path to transfer control and / or data signals. The memory 1030 is used to store a computer program, and the processor 1010 is used to call from the memory 1030. The computer program is run to control the transceiver 1020 to send and receive signals.

The processor 1010 is configured to execute program code stored in the memory 1030 to implement functions of the terminal device in the foregoing method embodiment. In specific implementation, the memory 1030 may also be integrated in the processor 1010 or independent of the processor 1010. The transceiver 1020 may be implemented by means of a transceiver circuit.

The above communication device 1000 may further include an antenna 1040 for sending uplink data or uplink control signaling output by the transceiver 1020 through a wireless signal, or sending downlink data or downlink control signaling to the transceiver 1020 for further processing.

It should be understood that the device 1000 may correspond to the terminal device in the method 500 according to the embodiment of the present application, and the device 1000 may also be a chip or a component applied to the terminal device. In addition, each module in the device 1000 implements a corresponding process in the method 500 in FIG. 5. Specifically, the memory 1030 is used to store program code, so that the processor 1010 controls the processor 1010 to The method S503 is performed, and the transceiver 1020 is configured to perform S502 in the method 500. The specific process of each unit performing the corresponding steps is described in the method 500 in detail.

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

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

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the device embodiments described above are only schematic, and the division of the units is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined. In addition, the displayed or discussed mutual coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices, or units.

In addition, the functional units in the embodiments of the present application may be integrated into one physical entity, or each unit may correspond to a physical entity, or two or more units may be integrated into one physical entity.

When the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially a part that contributes to the existing technology or a 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 cause 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 method described in the embodiments of the present application. The aforementioned storage media include: U disks, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks or optical disks, and other media that can store program codes .

Claims (29)

1. A communication method, comprising:

   Determine the amount of time deviation before and after the clock is updated;

   Sending instruction information, the instruction information including information on the amount of time deviation.
2. The method according to claim 1, wherein the indication information is carried in a reference signal.
3. The method according to claim 2, wherein the sequence of the reference signal is generated according to the amount of time deviation; or

   The reference signal sequence is time-frequency resource mapped according to the time offset.
4. The method according to claim 1, wherein the indication information is carried in downlink control information DCI, a media access control unit MAC CE, or radio resource control RRC signaling.
5. The method according to any one of claims 1 to 4, wherein the sending instruction information comprises:

   When the time deviation is greater than or equal to a preset first threshold, the indication information is sent.
6. The method according to any one of claims 1 to 5, wherein the method further comprises:

   Send second instruction information, where the second instruction information includes information used to indicate a time granularity of the time deviation amount.
7. A communication method, comprising:

   Receiving instruction information, the instruction information including information used to indicate an amount of time deviation before and after a clock update;

   Correct the time information according to the instruction information.
8. The method according to claim 7, wherein the indication information is carried in a reference signal.
9. The method according to claim 8, wherein the sequence of the reference signal is generated according to the amount of time deviation; or

   The reference signal sequence is time-frequency resource mapped according to the time offset.
10. The method according to claim 7, wherein the indication information is carried in downlink control information DCI, media access control unit MAC CE, or radio resource control RRC signaling.
11. The method according to any one of claims 7 to 10, wherein the correcting time information according to the instruction information comprises:

    Acquiring a time deviation amount according to the instruction information;

    Addition or subtraction is performed on the time information and the time deviation amount, and the operation result is used as new time information.
12. The method according to any one of claims 7 to 11, wherein the method further comprises:

    Send second instruction information, where the second instruction information includes information used to indicate a time granularity of the time deviation amount.
13. A communication device, comprising:

    A processing unit for determining a time deviation amount before and after a clock update;

    The communication unit is configured to send instruction information, where the instruction information includes information used to indicate the amount of time deviation.
14. The apparatus according to claim 13, wherein the indication information is carried in a reference signal.
15. The apparatus according to claim 14, wherein the sequence of the reference signal is generated according to the amount of time deviation; or

    The reference signal sequence is time-frequency resource mapped according to the time offset.
16. The device according to claim 13, wherein the indication information is carried in downlink control information DCI, a media access control unit MAC CE, or radio resource control RRC signaling.
17. The device according to any one of claims 13 to 16, wherein the communication unit is further configured to:

    When the time deviation is greater than or equal to a preset first threshold, the indication information is sent.
18. The device according to any one of claims 13 to 17, wherein the communication unit is further configured to send second instruction information, and the second instruction information includes a time granularity used to indicate the time deviation amount. Information.
19. A communication device, comprising:

    A communication unit for receiving instruction information, the instruction information including information for indicating an amount of time deviation before and after a clock update;

    A processing unit, configured to correct time information according to the instruction information.
20. The apparatus according to claim 19, wherein the indication information is carried in a reference signal.
21. The apparatus according to claim 20, wherein the sequence of the reference signal is generated according to the amount of time deviation; or

    The reference signal sequence is time-frequency resource mapped according to the time offset.
22. The apparatus according to claim 19, wherein the indication information is carried in downlink control information DCI, a media access control unit MAC CE, or radio resource control RRC signaling.
23. The device according to any one of claims 19 to 22, wherein the processing unit is further configured to:

    Acquiring a time deviation amount according to the instruction information;

    Addition or subtraction is performed on the time information and the time deviation amount, and the operation result is used as new time information.
24. The device according to any one of claims 19 to 23, wherein the communication unit is further configured to send second instruction information, and the second instruction information includes a time granularity used to indicate the time deviation amount Information.
25. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, and when the computer program is executed, the method according to any one of claims 1 to 12 is implemented.
26. A chip system is characterized in that the chip system includes:

    Memory for storing instructions;

    A processor, configured to call and execute the instructions from the memory, so that the communication device on which the chip system is installed executes the method according to any one of claims 1 to 12.
27. A communication device comprising a module for performing the method according to any one of claims 1 to 6 or 7 to 12.
28. A communication device, comprising a processor and an interface circuit, wherein the interface circuit is configured to receive a signal from a communication device other than the communication device, and transmit the signal to the processor, or transmit the signal from the processor. The signal of the processor is sent to a communication device other than the communication device, and the processor is configured to implement the method according to any one of claims 1 to 6 or 7 to 12 through a logic circuit or execute code instructions. .
29. A computer program, characterized in that when the computer program is executed, the method according to any one of claims 1 to 6 or 7 to 12 is implemented.

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