WO2020200017A1

WO2020200017A1 - Communication method and device

Info

Publication number: WO2020200017A1
Application number: PCT/CN2020/081257
Authority: WO
Inventors: 王婷; 唐浩
Original assignee: 华为技术有限公司
Priority date: 2019-03-29
Filing date: 2020-03-25
Publication date: 2020-10-08
Also published as: CN111757459B; CN111757459A

Abstract

A communication method and device, relating to the technical field of communications. The method comprises: a first terminal device determining the timing of transmitting a sidelink signal to a second terminal device to be an uplink timing; and transmitting, according to the uplink timing, a sidelink signal to the second terminal device, wherein the sidelink signal comprises sidelink control information and sidelink data. The technical solution helps reduce interference from sidelink signals on uplink signals, improves the communication performance, and is applicable to a scenario in which sidelink control information and sidelink data are frequency-division multiplexed or are transmitted in the same time unit, so as to realize parallel transmission of sidelink signals and uplink signals.

Description

Communication method and device

Cross references to related applications

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 201910253483.9, and the application name is "a communication method and device" on March 29, 2019, the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the field of communication technology, and in particular to a communication method and device.

Background technique

At present, in long term evolution (LTE), the base station configures the uplink timing advance for each terminal device in the cell, so that different terminal devices in the same cell can transmit uplink signals in the same time slot. The arrival time at the base station is aligned, which helps to avoid interference between multiple uplink signals in a cell (intra-cell). Among them, the uplink signals sent by different terminal devices are orthogonal. However, the communication between the terminal device and the terminal device may also cause interference to these uplink signals.

Therefore, how to reduce the interference of the communication between the terminal equipment and the terminal equipment on the uplink signal has important practical value for improving the communication performance.

Summary of the invention

The present application provides a communication method and device, which help reduce the interference of the communication between the terminal equipment and the terminal equipment on the uplink signal, and improve the communication performance.

In the first aspect, a communication method according to an embodiment of the present application includes:

The first terminal device determines that the timing of sending the side link signal to the second terminal device is the uplink timing, and sends the side link signal to the second terminal device according to the uplink timing. The side link signal includes side link control information and side link data.

In the embodiment of the present application, since the side link signal is sent according to the uplink timing, it helps to reduce the interference of the side link signal to the uplink signal and improve the communication performance. In addition, since the side link signal includes side link control information and side link data, the communication method of the embodiment of the present application is suitable for frequency division multiplexing of side link control information and side link data or side link control information and side link data. The scenario where the link data is sent in the same time unit can realize the parallel sending of the side link signal and the uplink signal.

For example, the uplink timing may be understood as the timing at which the first terminal device sends an uplink signal.

In a possible design, the side link control information and the side link data are located in the same time unit.

In a possible design, the timing at which the first terminal device sends the sidelink signal to the second terminal device is determined according to downlink timing and uplink timing advance. This helps simplify the implementation.

For example, the downlink timing may be understood as the timing at which the first terminal device receives the downlink signal; the uplink timing advance may be understood as the difference between the timing at which the first terminal device sends an uplink signal and the timing at which the downlink signal is received .

In a possible design, the first terminal device sends a side link link establishment signaling to the second terminal device, and the side link link establishment signaling includes timing information; the timing information is used for Indicate the timing of sending the side link signal to the second terminal device; wherein the side link link establishment signaling is used by the first terminal device to request the establishment of a side link link with the second terminal device Or, the side link link establishment signaling is used by the first terminal device to respond to a request of the second terminal device to establish a side link link. Through the above technical solution, it is helpful to improve the receiving efficiency and accuracy of the side link signal, thereby improving the receiving performance.

In a possible design, the first terminal device sends a synchronization timing difference to the second terminal device; the synchronization timing difference is the difference between the timing based on the first synchronization source and the timing based on the second synchronization source; The first synchronization source is a first network device or a first global navigation satellite system GNSS; the second synchronization source is a second network device, a second GNSS or a third terminal device. This helps to further simplify the terminal equipment receiving the side link signal to determine the timing of receiving the side link signal.

In a possible design, the first synchronization source is a synchronization source used by the first terminal device to perform side-link communication; the second synchronization source is a second terminal device to perform side-link communication The synchronization source used during communication. Help simplify the implementation.

In a possible design, the first terminal device sends an uplink signal in a time unit for sending the sidelink signal according to the uplink timing. Therefore, under the condition of reducing the interference of the side link signal to the uplink signal, the parallel transmission of the uplink signal and the side link signal is realized, which helps to improve the communication efficiency.

In a possible design, when the side link timing advance is less than or equal to the first threshold, the first terminal device sends the side link signal to the second terminal device according to the uplink timing. This helps to reduce the influence of the side link signal sent in advance on the reception of the downlink signal.

For example, the side link timing advance is the difference between the timing at which the first terminal device sends the side link signal to the second terminal device and the reference timing. For example, the reference timing may be the timing at which the first terminal device receives the downlink signal.

In a possible design, the first threshold is determined by the first terminal device according to the first system parameter, and the first system parameter is a system parameter used to send the side link signal. It is helpful to determine the sending mode of the side link signal according to the situation of sending the side link signal.

In a possible design, the first threshold is also determined according to a reference threshold; wherein, the reference threshold is a threshold corresponding to a reference system parameter. Help simplify the implementation.

In a possible design, the first system parameter belongs to a preset system parameter set, the system parameter set corresponds to one or more thresholds, and the first threshold is determined by the first terminal device according to the The first system parameter is determined in the one or more thresholds. Help simplify the implementation.

In a possible design, when the side link timing advance is greater than the first threshold, the first terminal device determines to send to the second terminal according to the first threshold and the downlink timing The timing at which the device sends the side link signal is the first timing; the first terminal device sends the side link signal to the second terminal device according to the first timing. This helps to reduce the influence of the side link signal sent in advance on the reception of the downlink signal.

In a possible design, when the side link timing advance is greater than the first threshold: the first terminal device sends the side link signal to the second terminal device according to the downlink timing Or the first terminal device discards the sending of the side link signal. This helps to further reduce the influence of the side link signal sent in advance on the reception of the downlink signal.

In a possible design, the first terminal device discards the transmission of the uplink signal in the time unit for sending the sidelink signal. Help simplify the implementation.

In a possible design, the communication mode for the first terminal device to send the side link signal to the second terminal device is multicast or unicast.

In the second aspect, another communication method in the embodiment of the present application includes:

The second terminal device receives the side link link establishment signaling sent by the first terminal device, and receives the side link signal sent by the first terminal device according to the timing information. Wherein, the side link link establishment signaling includes timing information, and the timing information is used to indicate the timing at which the first terminal device sends the side link signal to the second terminal device; the side chain The path signal includes side link control information and side link data; the side link link establishment signaling is used by the first terminal device to request the establishment of a side link link with the second terminal device, or the side link The link connection establishment signaling is used by the first terminal device to respond to the request of the second terminal device to establish a side link link.

In the embodiments of the present application, since the second terminal device can receive timing information, the second terminal device can determine the timing of receiving the side link signal sent by the first terminal device according to the timing information, thereby improving the reliability and reliability of receiving the side link signal. Efficiency, thereby improving reception performance.

In a possible design, the timing at which the first terminal device sends the sidelink signal to the second terminal device is an uplink timing. It is helpful to reduce the interference of the transmission of the side link signal to the uplink signal and improve the communication performance.

In a possible design, the second terminal device receives the synchronization timing difference sent by the first terminal device; the synchronization timing difference is the difference between the timing based on the first synchronization source and the timing based on the second synchronization source Timing difference; wherein, the first synchronization source is a first network device or a first global navigation satellite system GNSS; the second synchronization source is a second network device, a second GNSS or a third terminal device. It helps to further simplify the terminal equipment receiving the side link signal to determine the timing of receiving the side link signal.

In a possible design, the second terminal device determines the timing of receiving the side link signal sent by the first terminal device according to the timing information and the synchronization timing difference; and according to receiving the first terminal device A terminal device receives the side link signal sent by the first terminal device at the timing when the side link signal is sent. This helps simplify the implementation.

In the third aspect, this application provides a device. The device may be a terminal device, a device in a terminal device, or a device that can be used with the terminal device. The device may include a processing module and a transceiver module, and the processing The module and the transceiver module can perform the corresponding functions in the first aspect and any of the methods designed in the first aspect, specifically:

The processing module is used to determine that the timing of sending the side link signal to the second terminal device is the uplink timing, and the side link signal includes side link control information and side link data; the transceiver module is used to send data to the second terminal device according to the uplink timing. The second terminal device sends the side link signal.

In a possible design, the timing at which the transceiver module sends the sidelink signal to the second terminal device is determined according to downlink timing and uplink timing advance.

In a possible design, the transceiver module is further configured to send side link link establishment signaling to the second terminal device, and the side link link establishment signaling includes timing information; the timing information is used for At the timing of instructing to send the side link signal to the second terminal device; wherein the side link link establishment signaling is used by the transceiver module to request the establishment of a side link link with the second terminal device, Alternatively, the side link link establishment signaling is used by the transceiver module to respond to a request of the second terminal device to establish a side link link.

In a possible design, the transceiver module is further configured to send a synchronization timing difference to the second terminal device; the synchronization timing difference is the difference between the timing based on the first synchronization source and the timing based on the second synchronization source The first synchronization source is the first network device or the first global navigation satellite system GNSS; the second synchronization source is the second network device, the second GNSS or the third terminal device.

In a possible design, the first synchronization source is the synchronization source used when the device performs side link communication; the second synchronization source is the synchronization source used when the second terminal device performs side link communication. The synchronization source used.

In a possible design, the transceiver module is further configured to send an uplink signal on a time unit used for sending the sidelink signal according to the uplink timing.

In a possible design, when the side link timing advance is less than or equal to the first threshold, the transceiver module is configured to send the side link signal to the second terminal device according to the uplink timing.

In a possible design, the first threshold is determined by the processing module according to the first system parameter, and the first system parameter is a system parameter used to send the side link signal.

In a possible design, the first threshold is also determined according to a reference threshold; wherein, the reference threshold is a threshold corresponding to a reference system parameter.

In a possible design, the first system parameter belongs to a preset system parameter set, the system parameter set corresponds to one or more thresholds, and the first threshold is determined by the processing module according to the first The system parameters are determined in the one or more thresholds.

In a possible design, when the side link timing advance is greater than the first threshold, the processing module is further configured to determine to the second threshold according to the first threshold and the downlink timing. The timing at which the terminal device sends the side link signal is the first timing; the transceiver module is further configured to send the side link signal to the second terminal device according to the first timing.

In a possible design, when the sidelink timing advance is greater than the first threshold: the transceiver module sends the sidelink signal to the second terminal device according to the downlink timing; or The transceiver module discards the transmission of the side link signal.

In a possible design, the transceiving module discards the transmission of the uplink signal in the time unit for transmitting the sidelink signal.

In a possible design, the communication mode for the transceiver module to send the sidelink signal to the second terminal device is multicast or unicast.

In the fourth aspect, the present application provides a device, which may be a terminal device, a device in a terminal device, or a device that can be used with the terminal device. The device may include a processing module and a transceiver module, and the processing The module and the transceiver module can perform the corresponding functions in the second aspect and any of the methods designed in the second aspect, specifically:

The transceiver module is configured to receive the side link link establishment signaling sent by the first terminal device; wherein the side link link establishment signaling includes timing information, and the timing information is used to instruct the first terminal device to send The timing at which the apparatus sends the side link signal; the side link signal includes side link control information and side link data; the side link link establishment signaling is used by the first terminal device to request and The apparatus establishes a side link link, or the side link connection establishment signaling is used by the first terminal equipment to respond to a request of the apparatus to establish a side link link; and the processing module is used to trigger according to the timing information The transceiver module receives the side link signal sent by the first terminal device.

In a possible design, the transceiver module is further configured to receive the synchronization timing difference sent by the first terminal device; the synchronization timing difference is the timing between the timing based on the first synchronization source and the timing based on the second synchronization source Poor; wherein the first synchronization source is a first network device or a first global navigation satellite system GNSS; the second synchronization source is a second network device, a second GNSS or a third terminal device.

In a possible design, the processing module is configured to determine the timing of receiving the side link signal sent by the first terminal device according to the timing information and the synchronization timing difference; and according to receiving the first terminal device The timing when the device sends the side link signal triggers the transceiver module to receive the side link signal sent by the first terminal device.

In a possible design, the first synchronization source is the synchronization source used when the first terminal device performs side-link communication; the second synchronization source is the synchronization source used when the device performs side-link communication. The synchronization source used.

In a fifth aspect, an embodiment of the present application provides a device, which includes a processor, configured to implement the method described in the first aspect. The device may also include a memory for storing instructions and data. The memory is coupled with the processor, and when the processor executes the program instructions stored in the memory, the method described in the first aspect and/or the second aspect can be implemented. The device may also include a communication interface, which is used for the device to communicate with other devices. Exemplarily, the communication interface may be a transceiver, circuit, bus, module, or other type of communication interface, and other devices may be Network equipment or terminal equipment, etc.

In one possible design, the device includes:

Memory, used to store program instructions;

The processor is configured to call instructions stored in the memory, so that the device executes any possible design method of the first aspect and the first aspect of the embodiments of the present application, or causes the device to execute the second aspect of the embodiments of the present application And any possible design method in the second aspect.

In a sixth aspect, embodiments of the present application also provide a computer-readable storage medium, including instructions, which when run on a computer, cause the computer to execute the first aspect and any of the possible design methods of the first aspect, or the first The second aspect and any possible design method of the second aspect.

In a seventh aspect, an embodiment of the present application also provides a chip system, which includes a processor and may also include a memory, for implementing the first aspect and any possible design method of the first aspect, or the second aspect And any possible design method in the second aspect. The chip system can be composed of chips, or can include chips and other discrete devices.

In an eighth aspect, the embodiments of the present application also provide a computer program product, including instructions, which when run on a computer, cause the computer to execute the first aspect and any possible design method of the first aspect, or the second Aspect and any possible design method of the second aspect.

In addition, the technical effects brought about by any one of the possible design methods in the third aspect to the eighth aspect can be referred to the technical effects brought about by different design methods in the method section, which will not be repeated here.

Description of the drawings

FIG. 1 is a schematic diagram of the structure of a radio frame according to an embodiment of the application;

FIG. 2 is a schematic diagram of a bandwidth relationship between a carrier bandwidth part and a carrier according to an embodiment of the application;

Figure 3a is a schematic diagram of an uplink timing advance according to an embodiment of the application;

Figure 3b is a schematic diagram of a side link timing advance of an embodiment of the application;

FIG. 4a is a schematic flowchart of a communication method according to an embodiment of this application;

4b is a schematic flowchart of a communication method according to another embodiment of this application;

FIG. 5 is a schematic diagram of the architecture of a communication system according to an embodiment of the application;

FIG. 6 is a schematic diagram of communication using an uplink advance mechanism and an uplink advance mechanism according to an embodiment of the application;

FIG. 7 is a schematic diagram of the signaling structure of an embodiment of the application;

FIG. 8 is a schematic structural diagram of signaling according to another embodiment of this application;

FIG. 9 is a schematic diagram of the multiplexing of side link information and side link data according to an embodiment of the application;

FIG. 10 is a schematic diagram of the multiplexing situation of side link information and side link data according to another embodiment of the application;

FIG. 11 is a schematic flowchart of a communication method according to another embodiment of this application;

FIG. 12 is a schematic diagram of a time slot according to an embodiment of the application;

FIG. 13a is a schematic diagram of the timing relationship of an embodiment of this application;

FIG. 13b is a schematic diagram of the timing relationship of another embodiment of the application;

FIG. 14 is a schematic diagram of a time slot relationship according to an embodiment of the application;

15 is a schematic flowchart of a communication method according to another embodiment of this application;

16 is a schematic flowchart of a communication method according to another embodiment of this application;

FIG. 17 is a schematic structural diagram of a device according to an embodiment of the application;

FIG. 18 is a schematic structural diagram of a device according to another embodiment of the application.

detailed description

In the embodiments of the present application, "at least one" refers to one or more, and "multiple" refers to two or more. "And/or" describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, and B exists alone, where A, B can be singular or plural. The character "/" generally indicates that the associated objects are in an "or" relationship. "The following at least one (item)" or similar expressions refers to any combination of these items, including any combination of a single item (a) or a plurality of items (a). For example, at least one of a, b, or c can mean: a, b, c, a and b, a and c, b and c, or a, b and c, where a, b, c Each of them can be an element or a collection containing one or more elements.

In the embodiments of the present application, "exemplary", "in some embodiments", "in another embodiment", etc. are used to represent examples, illustrations, or illustrations. Any embodiment or design solution described as an "example" in this application should not be construed as being more preferable or advantageous than other embodiments or design solutions. Rather, the term example is used to present the concept in a concrete way.

In the examples of this application, "of", "corresponding, relevant" and "corresponding" can sometimes be used together. It should be pointed out that, when the difference is not emphasized, the meaning is to be expressed Is consistent. In the embodiments of this application, communication and transmission can sometimes be used together. It should be noted that, without emphasizing the difference, the meanings expressed are the same. For example, transmission can include sending and/or receiving, and can be a noun or a verb.

It should be pointed out that the terms "first" and "second" involved in the embodiments of this application are only used for the purpose of distinguishing description, and cannot be understood as indicating or implying relative importance, nor can it be understood as indicating or implying order. In the embodiments of this application, equal to can be used in conjunction with greater than, applicable to the technical solution adopted when greater than, and can also be used in conjunction with less than, applicable to the technical solution adopted when equal to less than, it should be noted that when equal to greater than is connected When used, do not use with less than; when equal and less than, do not use with greater than.

Hereinafter, some terms in the embodiments of the present application will be explained to facilitate the understanding of those skilled in the art.

1. Terminal equipment. The terminal device in the embodiment of this application is a device with wireless transceiver function, which can be called terminal (terminal), user equipment (UE), mobile station (MS), mobile terminal (MT) ), access terminal equipment, vehicle-mounted terminal equipment, industrial control terminal equipment, UE unit, UE station, mobile station, remote station, remote terminal equipment, mobile equipment, UE terminal equipment, wireless communication equipment, UE agent or UE device, etc. The terminal device can be fixed or mobile. It should be noted that the terminal device may support at least one wireless communication technology, such as LTE, new radio (NR), wideband code division multiple access (WCDMA), and so on. For example, the terminal device may be a mobile phone (mobile phone), a tablet computer (pad), a desktop computer, a notebook computer, an all-in-one machine, a vehicle-mounted terminal, a virtual reality (VR) terminal device, and an augmented reality (AR) terminal Equipment, wireless terminals in industrial control, wireless terminals in self-driving (self-driving), wireless terminals in remote medical surgery, wireless terminals in smart grid (smart grid), transportation safety Wireless terminals in (transportation safety), wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless Local loop (wireless local loop, WLL) stations, personal digital assistants (personal digital assistants, PDAs), handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, wearable devices, future mobile communications The terminal equipment in the network or the terminal equipment in the future evolved public mobile land network (Public Land Mobile Network, PLMN), etc. In some embodiments of the present application, the terminal may also be a device with a transceiver function, such as a chip system. Among them, the chip system may include a chip, and may also include other discrete devices.

2. Network equipment. The network device in the embodiments of the present application is a device that provides wireless communication functions for terminal devices, and may also be referred to as an access network device, a radio access network (RAN) device, and the like. Among them, the network device can support at least one wireless communication technology, such as LTE, NR, WCDMA, and so on. For example, the network equipment includes but is not limited to: next generation base station (gNB), evolved node B (evolved node B, eNB), and wireless network control in the fifth-generation mobile communication system (5th-generation, 5G) Radio network controller (RNC), node B (node B, NB), base station controller (BSC), base transceiver station (BTS), home base station (for example, home evolved node B, Or home node B, HNB, baseband unit (BBU), transmitting and receiving point (TRP), transmitting point (TP), mobile switching center, etc. The network device can also be a wireless controller, a centralized unit (CU), and/or a distributed unit (DU) in a cloud radio access network (cloud radio access network, CRAN) scenario, or the network device can These are relay stations, access points, in-vehicle equipment, terminal equipment, wearable equipment, and network equipment in future mobile communications or network equipment in the future evolved PLMN. In some embodiments, the network device may also be a device having a wireless communication function for terminal devices, such as a chip system. For example, the chip system may include a chip, and may also include other discrete devices.

3. Communication between terminal equipment and network equipment. In the embodiment of the present application, the terminal device and the network device communicate through a communication interface. For example, the communication interface between the terminal device and the network device may be a universal UE to network interface (universal UE to network interface, Uu air interface). When the communication interface between the terminal device and the network device is a Uu air interface, the communication between the terminal device and the network device can also be referred to as Uu air interface communication.

4. Uplink communication. The uplink communication in the embodiment of the present application may also be referred to as uplink transmission, which refers to a process in which the terminal device sends a signal to the network device in the communication between the terminal device and the network device. Among them, the signal sent by the terminal device to the network device may be referred to as an uplink signal or uplink information. For example, the uplink signal includes uplink control information (UCI) and uplink data. The uplink control information is used to carry relevant information fed back by the terminal equipment, such as channel state information (CSI), acknowledgement (acknowledgement, ACK)/negative acknowledgement (NACK), etc. Specifically, uplink control information can be carried on a physical uplink control channel (PUCCH), and uplink data can be carried on a physical uplink shared channel (PUSCH).

5. Downlink communication. The downlink communication in the embodiments of the present application may also be referred to as downlink transmission, which refers to a process in which the terminal device receives a signal sent by the network device in the communication between the terminal device and the network device. Wherein, the terminal device receiving the signal sent by the network device may be called a downlink signal or downlink information. For example, the downlink signal may include downlink control information (downlink control information, DCI) and downlink data (downlink data). The downlink control information is related information used for downlink data scheduling, for example, information such as the resource allocation of the data channel and the modulation and coding scheme. Specifically, downlink control information may be carried on a physical downlink control channel (PDCCH), and downlink data may be carried on a physical downlink shared channel (PDSCH).

6. Communication between terminal equipment and terminal equipment. In the embodiments of the present application, the communication link between the terminal device and the terminal device can be called a sidelink, so the communication between the terminal device and the terminal device can be called sidelink communication, or sidelink Road transmission. The signal transmitted in the communication between the terminal device and the terminal device may be referred to as a side link signal or side link information. For example, the sidelink signal may include sidelink control information (SCI) and/or sidelink data (sidelink data). The SCI may be related information used for side link data scheduling, such as the resource allocation of the data channel, modulation and coding scheme (modulation and coding scheme, MCS) and other information. In the embodiments of the present application, the SCI may also be referred to as sidelink scheduling assistance (Sidelink Scheduling Assistance, SL SA). Specifically, the SCI can be carried on a physical sidelink shared channel (PSSCH), and the sidelink data can be carried on a physical sidelink control channel (PSCCH). As another example, the sidelink signal may also include sidelink feedback control information (SFCI). The SFCI may include one or more of channel state information (channel state information, CSI) and hybrid automatic repeat request (HARQ) information. HARQ information may include ACK, NACK, and so on. Specifically, the SFCI may be carried on a physical sidelink feedback channel (PSFCH). Among them, PSFCH can also be called a side link feedback channel.

7. Time unit. The time unit in the embodiment of the present application may refer to a period of time in the time domain. Wherein, one time unit in the embodiment of the present application may include one or more basic time units. Specifically, in the embodiments of the present application, communication, such as side link communication or Uu air interface communication, is based on a basic time unit. For example, the basic time unit may be a radio frame, a subframe, a slot, a micro-slot, a mini-slot, or a symbol. For example, the basic time unit is a subframe, and one time unit may include one or more subframes; for another example, the basic time unit is a symbol, and one time unit may include one or more symbols. In some embodiments, the duration of one radio frame may be 10 milliseconds (ms). One radio frame may include one or more subframes. For example, if the duration of one subframe is 1 ms, then one radio frame may include 10 subframes. One subframe may include one or more time slots. Among them, the duration of a time slot is related to the size of the subcarrier interval, and the duration of the time slots corresponding to the subcarrier interval of different sizes is different. For example, when the subcarrier interval is 15kHz, the duration of one time slot can be 1ms; when the subcarrier interval is 30kHz, the duration of one time slot can be 0.5ms. For example, one time slot in this embodiment of the present application may include one or more symbols. For example, under a normal (cyclic prefix, CP), a time slot may include 14 symbols; under an extended (extended) CP, a time slot may include 12 symbols. It should be understood that the symbols in the embodiments of the present application may also be referred to as time-domain symbols. For example, the symbols may be orthogonal frequency division multiplexing (OFDM) symbols, or may also be orthogonal frequency division multiplexing (OFDM) symbols based on discrete Fourier transform extension. Frequency division multiplexing (discrete fourier transform spread orthogonal frequency division multiplexing, DFT-s-OFDM) symbols, etc. In the embodiment of the present application, a mini-slot (or mini-slot) may be a unit smaller than a time slot, and a mini-slot may include one or more symbols. For example, a mini-slot (or mini-slot) may include 2 symbols, 4 symbols, or 7 symbols. One subframe may include one or more mini-slots. One time slot may include one or more mini time slots (or mini time slots).

Taking a subcarrier interval of 15 kHz as an example, the structure of a radio frame in the embodiment of the present application may be as shown in FIG. 1, and the radio frame has a duration of 10 ms and includes 10 subframes. The duration of each subframe is 1ms. Among them, each subframe includes 14 symbols. For example, mini slot 1 includes symbol 0, symbol 1, symbol 2, and symbol 3. For another example, mini-slot 2 includes symbol 2 and symbol 3. For another example, mini-slot 3 includes symbol 7, symbol 8, symbol 9, symbol 10, symbol 11, and symbol 12.

8. System parameters. The system parameters in the embodiments of the present application may be referred to as configuration parameters (numerology). For example, the system parameters may include sub-carrier spacing, and/or CP type. Among them, the CP type may include extended CP and normal CP.

9. Carrier bandwidth part. The bandwidth part of the carrier in the embodiments of this application may be referred to as bandwidth part (BWP) for short, which refers to a segment of continuous or discontinuous frequency domain resources on a carrier, where the bandwidth of this segment of continuous or discontinuous frequency domain resources Do not exceed the bandwidth capability of the terminal device, that is, the bandwidth of the BWP is less than or equal to the maximum bandwidth supported by the terminal device. Taking BWP as a continuous frequency domain resource on a carrier as an example, BWP can be a group of continuous resource blocks (resource block, RB) on the carrier, or BWP is a group of continuous subcarriers on the carrier, or BWP is a group of continuous subcarriers on the carrier. Group Consecutive resource block group (resource block group, RBG), etc. Wherein, one RBG includes at least one RB, such as 1, 2, 4, 6, or 8, etc., and one RB may include at least one subcarrier, such as 12, etc. The BWP used for communication between the terminal device and the network device in the embodiment of the present application is configured by the network device. For a terminal device, the network device can configure one or more BWPs within a carrier for the terminal device. For example, as shown in a in Figure 2, a network device configures a BWP in a carrier for the terminal device. Among them, the bandwidth of the BWP does not exceed the bandwidth capability of the terminal device, and the bandwidth of the BWP does not exceed the carrier bandwidth. For another example, as shown in b in Figure 2, the network device configures two BWPs for the terminal device in one carrier, namely BWP1 and BWP2, where BWP1 and BWP2 overlap. For another example, as shown in c in Figure 2, the network device configures two BWPs for the terminal device in one carrier, namely BWP1 and BWP2, where BWP1 and BWP2 do not overlap at all. It should be noted that the number of BWPs configured by the network device for the terminal device in the embodiment of the present application is not unlimited. Taking NR version 15 (release 15, Rel-15) as an example, a network device as a terminal device can be configured with up to 4 BWPs. For another example, in a frequency division duplexing (FDD) scenario, the network device may configure 4 BWPs for the uplink and downlink communication of the terminal device. For another example, in a time division duplexing (TDD) scenario, the network device may configure 4 BWPs for the uplink and downlink communication of the terminal device respectively, for example, the center bands of the BWPs with the same number are aligned. In addition, the network device can configure system parameters for the terminal device for each BWP. In the embodiments of the present application, the system parameters corresponding to different BWPs may be the same or different. Taking b in Figure 2 as an example, the system parameters corresponding to BWP1 and the system parameters corresponding to BWP2 may be the same or different. In other embodiments, the network device does not limit other configurations (for example, the location of the BWP) for each BWP as a terminal device. In actual communication, when a terminal device accesses a cell, it can activate a BWP to achieve communication with the network device. Generally, BWP is defined on a given carrier, that is, a BWP is located in a carrier. Of course, this application does not limit other definitions of BWP, or other BWP activation schemes.

10. Downlink timing (DL timing). In the embodiment of the present application, the downlink timing refers to the timing at which the terminal device receives a downlink signal, that is, the timing at which the terminal device performs downlink communication. Further, it may be the timing at which the terminal device receives the downlink signal sent by the network device. Specifically, the downlink timing is determined by the terminal equipment according to the synchronization signal or other signals sent by the network equipment. Downlink timing can be understood as the boundary or boundary timing of the time unit used by the terminal device to receive the downlink signal sent by the network device. For example, the downlink timing may be the start boundary or start time of the time unit used to receive the downlink signal sent by the network device. For example, if the downlink timing is T0, the start time of the time unit for receiving the downlink signal sent by the network device is T0.

11. Uplink timing advance (uplink timing advance). In the embodiment of this application, the uplink timing advance is essentially the difference between the timing of the terminal device sending the uplink signal and the timing of the terminal device receiving the downlink signal. It can also be understood as the timing of the terminal device sending the uplink signal and the terminal device receiving the downlink signal. A negative offset (negative offset) between. Take the time unit as a wireless frame as an example. Among them, the wireless frame used by the terminal device to receive the downlink signal may be referred to as a downlink frame, and the wireless frame used by the terminal device to transmit the uplink signal may be referred to as an uplink frame. For example, as shown in Figure 3a, the uplink timing advance can be understood as when the terminal device sends an uplink signal on the uplink frame with the frame number i of the radio frame, the start boundary T1 advances the corresponding frame number for the downlink frame with the frame number i. The duration TA of the starting boundary T2.

12. Uplink timing (uplink timing, UL timing). The uplink timing in the embodiment of the present application refers to the timing at which the terminal device sends an uplink signal, that is, the timing at which the terminal device performs uplink communication. Further, it may be the timing at which the terminal device sends an uplink signal to a network device or a global navigation satellite system (GNSS). Specifically, the uplink timing is determined by the terminal equipment according to the downlink timing, or determined by the terminal equipment according to the downlink timing and the uplink timing advance. It should be noted that when the uplink timing is determined by the terminal device according to the downlink timing, for example, the uplink timing is the downlink timing. When the uplink timing is determined by the terminal equipment according to the downlink timing and the uplink timing advance, the uplink timing may be the time after the downlink timing is advanced by the uplink timing advance.

Wherein, the uplink timing can be understood as the boundary or boundary timing of the time unit used by the terminal device to send the uplink signal to the network device. For example, if the uplink timing is time T1, the terminal device can use time T1 as a reference to send an uplink signal to the network device on the corresponding time unit. For another example, the uplink timing may be the starting boundary or starting time of the time unit used to send the uplink signal to the network device.

13. Sidelink timing advance (sidelink timing advance). In the embodiment of the present application, the side link timing advance is the difference between the timing at which the terminal device sends the side link signal and the reference timing. For example, the reference timing may be a downlink timing, or may be a timing based on a synchronization source used when the terminal device performs side link communication. For example, as shown in Figure 3b, the side link timing advance can be understood as when the terminal device sends a side link signal on the side link frame with the frame number i of the wireless frame, its starting boundary T1 is advanced by the corresponding frame number It is the duration TA of the start boundary T2 of the reference frame of i. For example, the reference frame may be a downlink frame.

14. Transmission link (Tx chain). The transmission link in the embodiment of the present application may also be referred to as a baseband link, a radio frequency link, a transmission link, or a channel bandwidth. For example, the transmission link may include a radio frequency processing link and/or a baseband processing link. It should be noted that the terminal device in the embodiment of the present application may support multiple transmission links. Among them, the terminal device may use one or more transmission links on a carrier to send signals. For example, the terminal device may support the use of independent transmission links to send uplink signals and side link signals separately on one carrier. For example, the terminal device may support on one carrier, using the first transmission link to send uplink signals, and the second transmission link to send side-link signals. Among them, the first transmission link and the second transmission link are two independent transmission links. For example, the terminal device may support the use of a shared transmission link to transmit uplink signals and side link signals on one carrier. For example, the terminal equipment may support using a third transmission link to transmit uplink signals and side link signals on one carrier, and the third transmission link is the aforementioned shared transmission link.

15. The base station scheduling mode of the side link. In the embodiments of the present application, the network device scheduling mode of the side link may also be referred to as the network device auxiliary scheduling mode. Specifically, in the side-link resource scheduling mode, the network device can configure side-link resources for two terminal devices in side-link communication through configuration information, where the side-link resources include one or more resources. The network device schedules resources from the configured side link resources for the terminal device at the transmitting end so that the terminal device at the transmitting end can send a side link signal to the terminal device at the receiving end. For example, the network device can schedule the side link resource used for sending the side link signal to the terminal device at the sending end through DCI. After receiving the DCI, the terminal device at the sending end can send the side link resources indicated in the DCI to The terminal device at the receiving end sends a side link signal. Generally, in side-link communication, the transceiver end uses the transceiver end that sends side-link data in the PSSCH as a reference. For example, in side link communication, the first terminal device sends side link data to the second terminal device in the PSSCH, then the first terminal device is the transmitting end terminal device, and the second terminal device is the receiving end terminal device.

The following takes the first terminal device and the second terminal device as an example to introduce the communication method in the side link network device scheduling mode. For example, as shown in Figure 4a, the following steps are included.

Step 401: The network device sends the side link resources for the first terminal device and the second terminal device respectively through the configuration information.

Step 402: The network device sends DCI to the first terminal device, where the DCI includes resource information scheduled from the configured side link resources when sending the side link signal to the second terminal device.

Step 403: After receiving the DCI, the first terminal device determines that the network device is the resource scheduled from the configured side link resources by the first terminal device sending the side link signal to the second terminal device.

Step 404: The first terminal device sends a side link signal to the second terminal device according to the resources scheduled by the network device.

Step 405: The second terminal device receives the side link signal sent by the second terminal device according to the side link resource configured by the network device.

In some embodiments, after receiving the sidelink signal, the second terminal device may send HARQ information to the first terminal device on the SFCI. For example, if the second terminal device correctly receives the sidelink signal, the HARQ information is ACK. For another example, if the second terminal device fails to receive the side link signal, the HARQ information may be NACK.

16. The terminal equipment of the side link independently selects the mode. In the autonomous selection mode of the terminal device of the side link, the network device can configure side link resources for the two terminal devices in side link communication through configuration information, where the side link resources include one or more resources. The terminal device at the sending end judges whether there are available resources in the side link resources configured by the network device. If there are available resources, the terminal device at the sending end can send the side link signal in the available resources. The way of distinguishing between the sending end and the receiving end in the side link communication can be referred to the above related description, which will not be repeated here.

The following takes the first terminal device and the second terminal device as an example to introduce the communication method in the autonomous selection mode of the side link terminal device. For example, as shown in Figure 4b, the following steps are included.

Step 411: The network device sends the side link resources to the first terminal device and the second terminal device respectively through the configuration information.

Step 412: The first terminal device determines available resources among the side link resources configured by the network device, and sends a side link signal to the second network device on the available resources.

Step 413: The second terminal device receives the side link signal sent by the second network device according to the side link resource configured by the network device.

The communication method of the embodiment of the present application will be described in detail below with reference to the accompanying drawings.

The embodiments of the present application can be applied to communication systems such as LTE and NR. Specifically, the network type of the communication system in the embodiment of the present application may be a homogeneous network or a heterogeneous network, which is not limited. As shown in FIG. 5, it is a schematic diagram of a network architecture of a communication system according to an embodiment of the application, which includes terminal equipment and network equipment. Specifically, the terminal device and the network device can perform Uu air interface communication, and the terminal device and the terminal device can perform side link communication.

Among them, the network equipment and terminal equipment of the embodiments of the present application can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; can also be deployed on water; and can also be deployed on airborne aircraft, balloons, and satellites. The embodiments of the present application do not limit the deployment scenarios of network devices and terminal devices.

In addition, the terminal device in the embodiment of the present application may be located within the coverage of the network device, or may be located outside the coverage of the network device. For example, when the terminal device is located within the coverage of the network device, the signal received power is greater than or equal to a certain threshold, such as -3dB. When the terminal device is located within the coverage of the network device, the terminal device may receive system messages and/or radio resource control (radio resource control, RRC) messages sent by the network device. For example, when the terminal device is located within the coverage of the network device, it can be in a connected state, or in an idle state, or in an inactive state. Among them, the terminal device in the link state can receive the system message sent by the network device. The terminal device in the link state can also establish an RRC link with the network device, that is, the terminal device can receive the RRC message sent by the network device. For the terminal device in the link state, Uu air interface communication and/or side link communication can be performed. When the terminal equipment is located outside the coverage of the network equipment, the signal received power is less than or equal to a certain threshold, such as -3dB. When the terminal device is outside the coverage of the network device, the terminal device cannot receive the downlink signal sent by the network device, or the reception performance is poor. For example, when the terminal device is outside the coverage of the network device, it can be in an idle state, or Can be in an inactive state. For terminal equipment in idle or inactive state, side link communication can be performed, and Uu air interface communication can also be performed. For example, for terminal equipment in idle or inactive state, in Uu air interface communication, usually Terminal equipment can receive synchronization signals sent by network equipment, etc.

It should be noted that, in the embodiments of this application, the communication between the network equipment and the terminal equipment and between the terminal equipment and the terminal equipment can be through a licensed spectrum (licensed spectrum), or through an unlicensed spectrum (unlicensed spectrum). It is possible to communicate through licensed spectrum and unlicensed spectrum at the same time, which is not limited. Communication between network equipment and terminal equipment and between terminal equipment and terminal equipment can be through the frequency spectrum below 6 gigahertz (gigahertz, GHz), communication through the frequency spectrum above 6 GHz, and the frequency spectrum below 6 GHz can also be used at the same time Communicate with the frequency spectrum above 6GHz. That is, the application is applicable to both low-frequency scenes (for example, sub 6G) and high-frequency scenes (above 6G). The embodiment of the present application does not limit the spectrum resources used between the network device and the terminal device, or between the terminal device and the terminal device. For example, for a terminal device in a linked state, the spectrum resource used between the terminal device and the terminal device may be a resource configured by the network device through system messages, or RRC messages, or dedicated signaling, or it may be predefined or At least one of pre-configured system public resources (for example, a system public carrier bandwidth part (BWP)) or dedicated resources (for example, a dedicated BWP). For a terminal device in an idle state or an inactive state, the spectrum resource used between the terminal device and the terminal device may be at least one of a predefined or pre-configured resource, a system common resource, and the like.

In addition, the types of communication in the embodiments of the present application may include broadcast, unicast, and multicast. Take side link communication as an example. Broadcasting can refer to the communication between one terminal device and multiple terminal devices. The purpose of broadcasting can be to enable all terminal devices to receive broadcast signals, but in reality one can receive broadcast signals. Or multiple terminal devices. For example, broadcast may refer to communication between a terminal device and all terminal devices in a cell. Multicast can refer to the communication between a terminal device and a group of terminal devices. The purpose of multicast can be for all terminal devices in a group of terminal devices to receive a multicast signal, but in reality, a group of terminals can receive a multicast message. One or more terminal devices in the device. Unicast can refer to the communication between one terminal device and another terminal device. The purpose of unicast is to allow a terminal device to receive a unicast message, but in practical applications, the terminal device may or may not receive the above unicast message.

In some other embodiments of the present application, as shown in FIG. 5, the communication system further includes a network management system. The terminal device can communicate with the network management system through a wired interface or a wireless interface. In addition, in the embodiment of the present application, the terminal device and the network management system may communicate through a network device, or may communicate directly. For example, the network management system may be an operator's network management system. It should be noted that the network device and the network management system in the embodiments of the present application may be two independent devices, or they may be integrated into one device, which is not limited. It should also be noted that, in the embodiments of the present application, for example, the network management system can pre-configure related information such as thresholds, algorithms, or strategies, and the network device can obtain information from the gateway system and send it to the terminal device, or the network management system can send it to the terminal device. .

The network architecture of the communication system shown in FIG. 5 is only an example, and does not limit the network architecture of the communication system in the embodiment of the present application. The embodiments of the present application do not limit the number of network devices and the number of terminal devices in the communication system. For example, when the communication system of the embodiment of the present application includes multiple network devices, the network device and the network device may perform multi-point coordinated communication. For example, the communication system includes multiple macro base stations and multiple micro base stations. Among them, the macro base station and the macro base station, the micro base station and the micro base station, and the macro base station and the micro base station can perform multi-point coordinated communication.

It should be understood that, in the uplink communication in the embodiment of the present application, the uplink signals sent by different terminal devices to the network device are orthogonal in time and frequency. In order to ensure the orthogonality of the uplink signals sent by different terminal devices when reaching the network equipment, an uplink timing advance mechanism is introduced. Specifically, the network equipment can configure the uplink timing advance for the terminal equipment, so that the uplink signals sent by different terminal equipment in the same cell at the same time unit arrive at the network equipment basically in time, so as to reduce the mutual relationship between the uplink signals. The purpose of the interference. It should be noted that in this embodiment of the application, the uplink timing advance configured by the network device for the terminal device is related to the transmission path from the terminal device to the network device. Therefore, the uplink timing advance configured by the network device for different terminal devices The amount can be the same or different.

When the terminal device determines the uplink timing according to the downlink timing, for the uplink signals sent by different terminal devices in the same cell at the same time unit, the time to reach the network device may be different. For example, as shown in a in Figure 6, time T1 is the starting time when the network device sends a downlink signal to the terminal device 1 and terminal device 2, and time T2 is the starting time when the terminal device 1 receives the downlink signal sent by the network device. T4 is the starting time when terminal device 2 receives the downlink signal sent by the network device. The time difference between T2 and T1 is TP1, and the time difference between T4 and T1 is TP2. If terminal device 1 is in time unit i When the uplink signal is sent to the network device 1, the terminal device 2 does not use the uplink timing advance mechanism when sending the uplink signal 2 to the network device in time unit i, that is to say, when the terminal device 1 and the terminal device 2 determine the uplink timing according to the downlink timing, The terminal device 1 starts sending the uplink signal 1 to the network device from time T2, and the network device starts to receive the uplink signal 1 from time T3, where the time difference between the time T3 and the time T2 is TP1. The terminal device 2 starts to send the uplink signal 2 to the network device at time T4, and the network device starts to receive the uplink signal 2 from time T5. The time difference between time T5 and time T4 is TP2. When TP1 and TP2 are different, the time when the uplink signal 1 and the uplink signal 2 reach the network device is different by TP3, which easily causes the uplink signal 1 and the uplink signal 2 to interfere with each other, so that the network device cannot correctly treat the received uplink signal. 1 and uplink signal 2 are decoded.

When the terminal device determines the uplink timing according to the downlink timing and the uplink timing advance, for the uplink signals sent by different terminal devices in the same cell at the same time unit, the arrival time of the network device can be basically aligned. For example, as shown in b in Figure 6, time T1 is the starting time when the network device sends a downlink signal to the terminal device 1 and terminal device 2, and time T2 is the starting time when the terminal device 1 receives the downlink signal sent by the network device. T4 is the starting time when terminal device 2 receives the downlink signal sent by the network device. The time difference between T2 and T1 is TP1, and the time difference between T4 and T1 is TP2. If terminal device 1 is in time unit i When the uplink signal is sent to the network device 1, the terminal device 2 uses the uplink timing advance mechanism when sending the uplink signal 2 to the network device on the time unit i, that is to say, the terminal device 1 and the terminal device 2 are determined according to the downlink timing and the uplink timing advance For uplink timing, for example, the network device configures the uplink timing advance 1 for the terminal device 1, and the network device configures the uplink timing advance 2 for the terminal device 2, where the uplink timing advance 1 is 2TP1 and the uplink timing advance 2 is 2TP2. The terminal device 1 starts to send the uplink signal 1 to the network device at time T3, where the time T3 is 2TP1 earlier than the time T2. The terminal device 2 starts to send the uplink signal 2 to the network device at time T5, where the time T5 is 2TP2 earlier than the time T4. In this case, the starting time when the uplink signal 1 and the uplink signal 2 arrive at the network device are basically the same, that is, the network device can receive the uplink signal 1 and the uplink signal 2 at the same time from the time T1. This helps to avoid mutual interference between the uplink signal 1 and the uplink signal 2.

Specifically, the network device in the embodiment of the present application may configure the downlink timing advance for the terminal device in the following manner:

In some embodiments of the present application, the network device may determine the uplink timing advance by measuring the preamble received from the terminal device during the random access process of the terminal device, and use random access response (random access response) to determine the uplink timing advance. , The timing advance command (timing advance command) field in the RAR sends the information used to indicate the uplink timing advance to the terminal device.

Example, the timing advance command may be carried in the information field of the index value, e.g. T _A, terminal device receives the random access response, from the timing advance command field acquired T _A, may be set according to predetermined rules, determining the uplink timing advance the amount. For example, the uplink timing advance N _TA = T _A × 16Ts, where for the definition or value of Ts, please refer to Chapter 4 of the LTE protocol 36.211 version 15.5.0, or refer to the NR protocol 38.211 version 15.5.0 , Or the relevant description in version 15.5.0 of the protocol 38.213. Of course, the method of obtaining T _A referred to in this application is not limited to this. For example, the method described in the subsequent version of the protocol listed above can be used, As long as those skilled in the art do not pay intellectual labor, they can be considered as being in the protection scope of this application. As an implementation, Ts=1/(15000*2048), which represents the length of time. Example, the timing advance command field occupies bits associated with the maximum range _A T, e.g., T _A may be in the range from 0 to 1282, a maximum of 1282, a minimum timing advance command field occupies 11 bits ( bit).

For example, when the number of bits occupied by the timing advance command field is 11 bits, the random access response may be as shown in Figure 7, including a timing advance command field, a field carrying uplink grant (UL grant) indication information, and a temporary cell A field of a radio network temporary identifier (C-RNTI) and a reserved bit R. Among them, the field that carries the uplink authorization indication information occupies 20 bits, and the field that carries the temporary C-RNTI occupies 16 bits.

However, although the network device configures the uplink timing advance for the terminal device during the random access process, over time, the signal transmission path between the terminal device and the network device may change, and the crystal oscillator of the terminal device may shift. , Doppler frequency shift, etc., so that the uplink timing advance configured by the network device for the terminal device during the random access process may not be able to meet the time requirements for the uplink signal to reach the network device. Therefore, in other implementations of this application In an example, the network device may also be based on the uplink signal sent by the terminal device (such as channel sounding reference signal (Sounding reference signal, SRS), demodulation reference signal (demodulation reference signal, DMRS), channel quality indicator (channel quality indicator, CQI) , ACK/NACK, uplink data, etc.) measure the uplink timing advance. When the uplink timing advance changes or the change in the uplink timing advance is greater than a certain threshold, the network device can send a timing advance command to the terminal device, where the timing advance The command is used to indicate the adjustment information of the uplink timing advance of the terminal equipment. This helps the time for the uplink signal sent by the terminal device to reach the network device to meet the demand and reduce the mutual interference between the uplink signals.

For example, the adjustment information of the uplink timing advance of the terminal device used by the timing advance command to indicate the index value T _A ′, for example, the value range of T _A ′ may be 0-63. After receiving the timing advance command, the terminal device can obtain the index value T _A ′, and then adjust the uplink timing advance last saved by the terminal device according to the index value T _A ′. For example, the most recent uplink timing advance saved by the terminal device is N _{TA_old} , and the index value T _A ′ is obtained from the network device, and N _{TA_old is} adjusted according to T _A ′ to obtain N _{TA_new} , and then the uplink signal is sent according to N _{TA_new} . For _{_{example, N TA_new = N TA_new + (}} T A '-31) × 16Ts. Among them, for Ts, please refer to Chapter 4 of LTE protocol 36.211, or refer to related descriptions in NR protocol 38.211 and protocol 38.213.

In some embodiments, the network device may send a timing advance command to the terminal device through a media access control control element (MAC CE). For example, the MAC CE used to send the timing advance command may be indicated by a MAC protocol data unit (protocol data unit, PDU) subhead with a logical channel identification (logical channel identification, LCID) of 11101. Among them, the structure of the MAC CE may be as shown in Figure 8, including two reserved bits R and a timing advance command field. The timing advance command field occupies 6 bits. The timing advance command field is used to carry adjustment information indicating the uplink timing advance of the terminal device.

In addition, the side link communication may also cause interference to the uplink communication, so the research on how to reduce the interference of the side link communication between the terminal device and the terminal device on the uplink communication has important practical value.

Common side-link communication includes device-to-device (D2D) communication and vehicle-to-everything (V2X) communication. X can be any object. The vehicle outreach in the embodiments of the present application may also be referred to as the Internet of Vehicles. For example, V2X communication may include vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructures (V2I) communication, etc., through communication between vehicle and X , Can realize the information exchange between the car and X, which can provide some traffic suggestions or advice to the driver.

For example, D2D communication in LTE is mainly used in public safety scenarios, and most of the services are periodically and slowly changing. Therefore, SCI and sidelink data usually adopt a time division multiplexing method, where SCI and sidelink data are located in different time domain resources. For example, as shown in a in Figure 9.

For example, V2X communication in LTE requires service time delay and terminal equipment can move. Therefore, SCI and sidelink data use frequency division multiplexing. As shown in b in Figure 9, SCI and sidelink data are located in the same time domain resource and different Frequency domain resources.

For another example, V2X in NR supports multiple SCI and sindlink data multiplexing methods. For example, under option 1A, SCI and sidelink data adopt time division multiplexing as shown in a in Figure 10. SCI and sidelink data occupy different time domain resources and the same frequency domain resources. For another example, under option 1B, SCI and sidelink data use time division multiplexing, as shown in b in Figure 10. SCI and sidelink data occupy different time domain resources, while the frequency domain resources occupied by SCI are the same as those occupied by sidelink data. A part of the frequency domain resources is the same. For another example, under option 2, SCI and sidelink data adopt frequency division multiplexing. As shown in c in Figure 10, SCI and sidelink data occupy different frequency domain resources and the same time domain resources. For another example, under option 3, the multiplexing mode of SCI and sidelink data can be shown as d in Figure 10.

Taking D2D communication in LTE as an example, SCI and sidelink data use time division multiplexing. For example, terminal equipment sends SCI and sidelink data through different subframes. Generally, SCI is used by terminal equipment to broadcast to other terminal equipment at the physical layer. of. Therefore, in some embodiments, the terminal device determines the timing for sending the SCI according to the downlink timing, and determines the timing for sending the sidelink data according to the downlink timing and the uplink timing advance. It can also be said that the transmission of the SCI does not use the uplink timing advance. The transmission of sidelink data uses the uplink timing advance mechanism. For example, the terminal device can broadcast the uplink timing advance used to send sidelink data to other terminal devices through the SCI, so that other terminal devices can receive sidelink data according to the uplink timing advance used to send sidelink data, thereby improving sidelink reception. The efficiency and reliability of data.

The embodiment of the application provides a communication method, which is applied to a scenario where SCI and sidelink data use frequency division multiplexing or a scenario where SCI and sidelink data are sent in the same time unit. For example, SCI and sidelink data are located in the same time unit. On different symbols. This method can enable the terminal equipment to transmit the uplink signal and the side link signal at the same time, and also helps the terminal equipment to reduce the interference to the uplink communication while performing side link communication and improve the transmission performance.

The following uses the first terminal device and the second terminal device as examples to describe in detail the communication method in the embodiment of the present application.

As an example, as shown in FIG. 11, it is a schematic flowchart of a communication method according to an embodiment of this application, which specifically includes the following steps.

Step 1101: The first terminal device determines the timing of sending the side link signal to the second terminal device. The sidelink signal includes SCI and sidelink data. For example, SCI and sidelink data can be located in the same time unit. For the explanation of the time unit, please refer to the above-mentioned related explanation of the time unit in the embodiments of the present application, which will not be repeated here.

By way of example, the type of communication between the first terminal device and the second terminal device in the embodiment of the present application may be multicast or unicast.

In the embodiment of the present application, the timing at which the first terminal device sends the side link signal to the second terminal device can be understood as the boundary or boundary timing of the time unit used by the first terminal device for side link communication, or the first terminal device The timing used by the device for side link communication. For example, as shown in Figure 12, time T0 is the boundary of the time unit used by the first terminal device for side link communication. If the side link signal is carried on time slot 0, since time T0 is the start of time slot 0 Boundary, the first terminal device can start sending the side link signal from time T0; if the side link signal is carried on time slot 4, the first terminal device can determine the starting boundary of time slot 4 according to time T0, and After reaching the starting boundary of time slot 4, the side link signal is sent.

For example, the boundary of the time unit can be determined according to the timing. The time unit can refer to a time slot or a symbol. For example, after the timing is determined, the position of any symbol in the time slot can be determined according to the timing. If the data is transmitted in a certain time slot If one or some symbols, the side link signal can be sent on one or some symbols in the time slot according to the timing.

Step 1102: The first terminal device sends a side link signal to the second terminal device according to the determined timing.

In the embodiment of this application, since the sidelink signal can include SCI and sidelink data, the first terminal device can send the SCI and sidelink data to the second terminal device according to the determined timing of sending the sidelink signal to the second terminal device. , Thereby improving transmission performance.

In some embodiments, the timing at which the first terminal device sends the side link signal to the second terminal device is the uplink timing, where the uplink timing is the timing at which the first terminal device sends the uplink signal, that is, the first terminal device is used to perform the side link. The timing of link communication is the same as the timing used by the first terminal device for uplink communication, thereby helping to reduce interference to uplink communication in Uu air interface communication.

The method for determining the timing at which the first terminal device sends the side link signal to the second terminal device will be described in detail below.

In some embodiments, if the uplink timing is determined based on the downlink timing and the uplink timing advance, the timing at which the first terminal device sends the sidelink signal to the second terminal device is determined based on the downlink timing and the uplink timing advance. Wherein, the downlink timing is the timing at which the first terminal device receives the downlink signal. The uplink timing advance is configured by the network device for the first terminal device. For a specific configuration method, refer to the above-mentioned related introduction in the embodiment of the present application, and details are not described herein again.

In other embodiments, if the uplink timing is determined according to the downlink timing, the timing at which the first terminal device sends the sidelink signal to the second terminal device may also be determined according to the downlink timing. For example, if the uplink timing is equal to the downlink timing, the timing at which the first terminal device sends the side link signal to the second terminal device is the downlink timing.

It can be understood that the downlink timing is the timing at which the first terminal device receives the downlink signal. For example, the downlink timing is the timing at which the first terminal device receives the downlink signal sent by the network device. Wherein, the downlink timing is determined by the first terminal device according to the synchronization signal or other signals sent by the network device.

In some embodiments of the present application, the timing at which the first terminal device sends the side link signal to the second terminal device is also related to the synchronization source used when the first terminal device performs side link communication. Hereinafter, the synchronization source used when the first terminal device performs sidelink communication is simply referred to as the synchronization source of the first terminal device. It should be noted that the synchronization source of the first terminal device can be understood as the synchronization source used by the first terminal device when communicating with the second terminal device, and can also be simply referred to as the synchronization source of the first terminal device for side-link communication. . For example, the synchronization source of the first terminal device may be one of a global navigation satellite system (GNSS), a network device, or other terminal devices. The first synchronization source may be predefined through a protocol, or may be notified by the network device to the first terminal device. For example, when the synchronization source of the first terminal device is a network device, the network device may be a network device for receiving an uplink signal sent by the first terminal device based on uplink timing, or may be another network device, which is not limited.

Since the timing of the first terminal device sending the side link signal to the second terminal device is based on the synchronization source of the first terminal device, and the downlink timing is based on the network device, it is based on the synchronization source of the first terminal device. The timing and downlink timing may be the same or different. For example, the timing based on the synchronization source of the first terminal device can be understood as the synchronization timing of the side link communication of the first terminal device, that is, the side link communication of the first terminal device uses the synchronization timing as a reference time reference. Wherein, the timing based on the synchronization source of the first terminal device is determined by the first terminal device according to the synchronization signal or other signals sent by the synchronization source. If the timing based on the synchronization source of the first terminal device is the same as the downlink timing, for example, the synchronization source of the first terminal device is the same as the synchronization source used by the first terminal device for Uu air interface communication, then the first terminal device does not need to perform the synchronization source. For time conversion between time, the side link signal can be sent to the second terminal device according to the uplink timing. When the timing of the first terminal device based on the first synchronization source is the same as the downlink timing, for example, as shown in Figure 13a, the downlink timing is T0 and the uplink timing advance is TA, then the uplink timing of the first terminal device is T1. Wherein, the time T1 is TA earlier than the time T0, and the timing when the first terminal device sends the side link signal is the time T1. If the timing based on the synchronization source of the first terminal device is different from the downlink timing, for example, the synchronization source of the first terminal device is different from the synchronization source used by the first terminal device for Uu air interface communication, the first terminal device may The difference between the timing of the synchronization source of the terminal device and the downlink timing converts the uplink timing to the time referenced by the synchronization source of the first terminal device, and then according to the conversion of the uplink timing to the time referenced by the first synchronization source, to the second The terminal device sends a side link signal. For example, as shown in Figure 13b, the downlink timing is T0, the uplink timing advance is TA, the uplink timing is T1, and the timing based on the synchronization source of the first terminal device is T2, then the downlink timing is the same as the synchronization source based on the first terminal device. The difference of the timing is R=T2-T0. If the timing of sending the side link signal by the first terminal device is the same as the uplink timing, the timing of sending the side link signal by the first terminal device is advanced by TA+R on the basis of the timing T2 based on the synchronization source.

In still other embodiments, if the uplink timing is determined according to the timing based on the synchronization source of the first terminal device, the timing at which the first terminal device sends the side link signal to the second terminal device is also based on the timing based on the first terminal device. The timing of the synchronization source is determined. For example, the uplink timing is the timing based on the synchronization source of the first terminal device, and the timing when the first terminal device sends the side link signal to the second terminal device is the timing based on the synchronization source of the first terminal device. For example, the synchronization source of the first terminal device may be GNSS or other terminal devices.

In this embodiment of the application, when the timing of the first terminal device sending the side link signal to the second terminal device is the same as the timing of the first terminal device sending the uplink signal, the first terminal device may also use the uplink timing to send The uplink signal is sent on the time unit of the side link signal. This helps to improve resource utilization while reducing interference from side-link signals to uplink signals.

It should be noted that when the first terminal device sends the side link signal to the second terminal device at the uplink timing, the first terminal device may send the side link signal and the uplink signal in parallel according to the uplink timing, using The carrier used to transmit the side link signal and the carrier used to transmit the uplink signal may be the same or different, and there is no limitation on this.

In the embodiment of the present application, when the timing of the first terminal device sending the side link signal to the second terminal device is the same as the uplink timing, the transmission link used by the first terminal device to send the side link signal to the second terminal device, It can be the same as or different from the transmission link used by the first terminal device to send the uplink signal, that is, the transmission link used by the first terminal device to send the side link signal is the same as the transmission link used by the first terminal device to send the uplink signal. When the sending links of can be independent sending links, they can also be the same sending link.

In the embodiment of the present application, when independent transmission links or different transmission channels are used for the transmission of the uplink signal and the transmission of the side link signal, the timing of sending the uplink signal and the timing of sending the side link signal may be different . For example, the timing of sending the uplink signal is determined according to the downlink timing and the uplink timing advance, and the timing of sending the side link signal is the downlink timing, which may be determined according to the synchronization signal.

In the embodiment of the present application, when a shared transmission link or the same transmission channel is used for the transmission of the uplink signal and the transmission of the side link signal, the timing of sending the uplink signal and the timing of sending the side link signal may be different . For example, when the uplink signal and the side link signal are sent in different time units, the time unit may be a symbol, a time slot, a mini-slot, a subframe, etc. The timing of sending the uplink signal may be determined according to the downlink timing and the uplink timing advance, and the timing of sending the side link signal may be the downlink timing, which may be determined according to the synchronization signal. When the timing of sending the uplink signal and the timing of sending the side link signal are different, the side link communication can be made simpler, and each terminal device can receive the side link signal according to their respective synchronization timing. For the transmission of the uplink signal, the terminal equipment can send the uplink signal according to the uplink timing without the transmission of the side link signal, to ensure that the uplink signal of each terminal device reaches the base station at the same time, to achieve the orthogonality of the signal received by the network device, and to ensure the uplink signal Transmission performance.

In particular, when the shared transmission link or the same transmission link is used for the transmission of the uplink signal and the transmission of the side link signal, if the uplink signal and the side link signal are transmitted in the same time unit, usually the first A terminal device uses one timing to send the side link signal and the uplink signal, that is, the timing of the first terminal device sending the side link signal and the timing of sending the uplink signal are the same, which helps to make the side link signal and the uplink signal It can reach the base station at the same time to ensure the orthogonality of the signals received by the base station, thereby helping to reduce the interference of the side link signal on the uplink signal.

In some embodiments, when the transmission link used by the first terminal device to transmit the side link signal is different from the transmission link used to transmit the uplink signal, that is, the transmission link used by the first terminal device to transmit the side link signal is different. When the transmission link used and the transmission link used for sending the uplink signal are independent transmission links, the timing of sending the side link signal by the first terminal device and the timing of sending the uplink signal may be different.

The following describes in detail the timing at which the first terminal device determines to send the side link signal to the second terminal device.

In some embodiments, the first terminal device uses the uplink timing advance mechanism when sending the uplink signal, while the first terminal device does not use the uplink timing advance mechanism when sending the side link signal to the second terminal device. For example, if the timing based on the synchronization source of the first terminal device is the same as the downlink timing, for example, the synchronization source of the first terminal device is a network device, then the first terminal device sends the timing of the side link signal to the second terminal device It may be determined based on the downlink timing, and the uplink timing may be determined based on the downlink timing and the uplink timing advance. For example, the timing at which the first terminal device sends the sidelink signal to the second terminal device is the downlink timing, and the uplink timing is the time that advances the uplink timing advance based on the downlink timing. For another example, if the timing of the first terminal device based on the synchronization source of the first terminal device is different from the downlink timing, for example, the synchronization source of the first terminal device is GNSS, the first terminal device sends a side link signal to the second terminal device The timing of can be determined based on the GNSS timing, and the uplink timing can be determined based on the downlink timing and the uplink timing advance. For example, the timing at which the first terminal device sends the sidelink signal to the second terminal device is a timing based on GNSS, and the uplink timing is a time that advances the uplink timing advance based on the downlink timing.

In the embodiments of the present application, for the second terminal device, if the second terminal device cannot determine the timing at which the first terminal device sends the side link signal, in some embodiments, the second terminal device may determine to receive the second terminal device through blind detection. The timing of the side link signal sent by a terminal device, and then the side link signal sent by the first terminal device is received. However, this blind detection method of determining the timing of receiving the side link signal sent by the first terminal device may require the second terminal device to try multiple detections, which easily increases the complexity of data processing, and may also lead to error detection and /Or missed inspection.

Therefore, in some embodiments of the present application, the first terminal device may notify the second terminal device of timing information for sending the side link signal during the process of establishing the side link link with the second terminal device. This helps the second terminal device to determine the timing of the first terminal device to send the side link signal, and can determine to receive the side link signal sent by the first terminal device according to the timing of the first terminal device sending the side link signal Compared with the blind detection method to determine the timing of receiving the side link signal sent by the first terminal device, the efficiency and accuracy are higher, which helps to improve the receiving performance of the second terminal device.

For example, the first terminal device may send the side link link establishment signaling to the second terminal device. Wherein, the side link link establishment signaling includes timing information, and the timing information is used to indicate the timing at which the first terminal device sends the side link signal to the second terminal device. For example, when the first terminal device initiates the establishment of a side link connection to the second terminal device, the side link link establishment signaling may be a side link link establishment request for the first terminal device to request to establish a side link with the second terminal device. Link link. For another example, when the second terminal device initiates the side link link establishment to the first terminal device, the side link link establishment signaling may be a response to the side link link establishment request for the first terminal device to respond to the second terminal device Request to establish a side link link.

For example, the timing information may be the timing when the first terminal device sends the side link signal to the second terminal device. For example, if the timing when the first terminal device sends the side link signal to the second terminal device is T1, the timing information may be T1. As another example, the timing information may also be indication information of the timing at which the first terminal device sends the side link signal to the second terminal device. For example, the timing information is a timing index value, where the timing T at which the first terminal device sends the side link signal to the second terminal device can be determined according to the timing index value. Specifically, the strategy or algorithm for determining the timing of sending the side link signal according to the timing index value may be predefined or configured in the second terminal device. As another example, the timing information may also be the timing at which the first terminal device sends the side link signal to the second terminal device when the synchronization source used by the second terminal device during side link communication is used as a reference. The foregoing is only an example of the specific implementation manner of the timing information, and does not limit the specific implementation manner of the timing information. In the embodiment of the present application, the timing information may also be implemented in other manners, which is not limited.

It should be noted that different terminal devices in the embodiments of the present application may use different synchronization sources when performing side-link communication. Therefore, when side-link communication is performed between terminal devices, there may be a synchronization timing difference. Among them, the synchronization timing difference can be understood as the difference in timing based on different synchronization sources. For example, the timing based on the first synchronization source is determined based on the synchronization signal of the first synchronization source, and the timing based on the second synchronization source is based on the second synchronization source. Determined, therefore, the difference between the timing based on the first synchronization source and the timing based on the second synchronization source is the synchronization timing difference between the first synchronization source and the second synchronization source.

If the synchronization timing difference between the synchronization source of the first terminal device and the synchronization source of the second terminal device is negligible, the second terminal device may determine the timing of receiving the side link signal sent by the first terminal device according to the timing information. For example, the second terminal device may determine the timing of receiving the side link signal sent by the first terminal device according to the timing of sending the side link signal by the first terminal device and the transmission delay between the terminal devices. Wherein, the transmission delay between terminal devices is the duration of the side link signal from the first terminal device to the second terminal device, or the duration of the side link signal from the second terminal device to the first terminal device. For example, the transmission delay between terminal devices may be sent by the first terminal device to the second terminal device through sidelink link establishment signaling, or it may be measured by the second terminal device based on other signals sent by the first terminal device . In particular, when the synchronization timing difference between the synchronization source of the first terminal device and the synchronization source of the second terminal device is negligible, the first terminal device may also notify the second terminal device that the synchronization timing difference is zero.

If the synchronization timing difference between the synchronization source of the first terminal device and the synchronization source of the second terminal device is not negligible, the second terminal device also needs to consider when determining the timing of receiving the side link signal of the first terminal device The synchronization timing is poor. Specifically, the second terminal device may determine the timing of receiving the side link signal of the first terminal device according to the timing of sending the side link signal by the first terminal device, the transmission delay between the terminal devices and the synchronization timing difference. It should be noted that in this embodiment of the application, the parameters involved when the second terminal device determines the timing of receiving the side link signal of the first terminal device may not be limited to the transmission delay between the terminal devices, the synchronization timing difference, and the first terminal device. The timing at which the device sends the side link signal.

In some embodiments, the first terminal device sends the synchronization timing difference to the second terminal device. This facilitates the second terminal device to determine the timing of receiving the side link signal. It should be noted that the synchronization timing difference sent by the first terminal device to the second terminal device in the embodiment of the present application may be the reference synchronization timing difference, or may be the synchronization source of the first terminal device and the synchronization source of the second terminal device. The synchronization timing difference between.

For example, when the synchronization timing difference sent by the first terminal device to the second terminal device is the reference synchronization timing difference, the reference synchronization timing difference may be the synchronization timing difference between the first synchronization source and the second synchronization source. For example, the first synchronization source may be the first network device, the first GNSS; the second synchronization source may be the second network device, the second GNSS, or the third terminal device. In the embodiment of the present application, the third terminal device may be the same terminal device as the first terminal device, or may be a different network device from the first terminal device. It should be noted that the first network device and the second network device may be the same network device or different network devices, and the first GNSS and the second GNSS may be the same GNSS or different GNSS.

It should be noted that when the reference synchronization timing difference is the synchronization timing difference between the first synchronization source and the second synchronization source, the synchronization source of the first terminal device may be the same as one of the first synchronization source and the second synchronization source. , It can also be different from the first synchronization source and the second synchronization source. Similarly, the synchronization source of the second terminal device can be the same as one of the first synchronization source and the second synchronization source, or it can be the same as the first synchronization source. , The second synchronization source is different. For example, if the first synchronization source is the first GNSS, the synchronization source of the first terminal device may be the first network device, or the first GNSS, etc., which is not limited. In addition, when the synchronization timing difference sent by the first terminal device to the second terminal device is the reference timing difference, the first synchronization source and the second synchronization source may be predefined through a protocol, or may be configured by the network device. The network device may be a network device that receives the uplink signal sent by the first terminal device based on the uplink timing, or may be other network devices, which is not limited.

For example, when the synchronization timing difference sent by the first terminal device to the second terminal device is the synchronization timing difference between the synchronization source of the first terminal device and the synchronization source of the second terminal device, if the first terminal device performs a side chain The synchronization source used in channel communication is the first network device, and the synchronization source used by the second terminal device in side-link communication is the second GNSS, then the synchronization timing difference is the difference between the first network device and the second GNSS Synchronization timing difference; if the synchronization source used by the first terminal device for sidelink communication is the first GNSS, and the synchronization source used by the second terminal device for sidelink communication is the second network device, the synchronization timing is poor It is the synchronization timing difference between the first GNSS and the second network device.

For example, when the first terminal device sends the synchronization timing difference to the second terminal device, the first terminal device may first obtain the synchronization timing difference, and then send the synchronization timing difference to the second terminal device. For example, when the synchronization timing difference is the reference synchronization timing difference, the synchronization timing difference may be pre-configured in the network management system, and the first terminal device may obtain it from the network management system. For another example, when the synchronization timing difference is the reference synchronization timing difference, the synchronization timing difference may also be obtained according to the first synchronization source and the second synchronization source. For another example, when the synchronization timing difference is the synchronization timing difference between the synchronization source of the first terminal device and the synchronization source of the second terminal device, the synchronization may be determined according to the synchronization source of the first terminal device and the synchronization source of the second terminal device. Poor timing.

Wherein, the synchronization timing difference and the timing at which the first terminal device sends the side link signal to the second terminal device may be carried in the same message and sent, or may be sent through different messages.

In some embodiments, the first terminal device may also determine, based on the reference synchronization timing difference and the timing at which the first terminal device sends the side link signal to the second terminal device, when the second synchronization source is used as a reference to the first terminal device When the second terminal device sends the side link signal timing, the first terminal device may notify the second terminal device of the timing when the first terminal device sends the side link signal to the second terminal device using the second synchronization source as a reference. Then, the second terminal device determines the timing of receiving the side link signal sent by the first terminal device according to the timing when the first terminal device sends the side link signal to the second terminal device when using the second synchronization source as a reference.

For example, the second terminal device may further determine the timing of receiving the side link signal sent by the first terminal device in combination with the transmission delay between the terminal devices.

For example, when the synchronization timing difference between the synchronization source of the first terminal device and the synchronization source of the second terminal device is t, the timing when the first terminal device sends the side link signal to the second terminal device is T, then the second When the synchronization source of the terminal device is a reference, the timing at which the first terminal device sends the side link signal to the second terminal device is (t+T). The first terminal device may notify the second terminal device of timing information for sending the sidelink signal during the process of establishing the sidelink link with the second terminal device, where the timing information is used to indicate (t+T).

For another example, the reference synchronization timing difference between the first synchronization source and the second synchronization source is t1, and the timing at which the first terminal device sends the side link signal to the second terminal device is T, if the first synchronization source is the first network Device, the second synchronization source is the second GNSS, the synchronization source used by the first terminal device for side link communication is the first GNSS, and the synchronization source used by the second terminal device for side link communication is the third terminal device, And the synchronization timing difference between the first GNSS and the first network device is t2, when the second synchronization source is used as a reference, the timing of the first terminal device sending the side link signal to the second terminal device is (t1+t2+ T). The first terminal device may notify the second terminal device of timing information for sending the sidelink signal during the process of establishing a sidelink link with the second terminal device, where the timing information may be used to indicate (t1+t2+T). After the second terminal device receives the timing information for indicating (t1+t2+T), it can be t3, (t1+t2+T) according to the synchronization timing difference between the third terminal device and the second synchronization source, Determine the timing of receiving the side link signal sent by the first terminal device.

In other embodiments, the first terminal device may determine when the first terminal device uses the synchronization source of the second terminal device as a reference based on the synchronization timing difference and the timing at which the first terminal device sends the side link signal to the second terminal device. The timing at which the device sends the side link signal to the second terminal device. The synchronization timing difference may refer to the synchronization timing difference, or may be the synchronization timing difference between the synchronization source of the first terminal device and the synchronization source of the second terminal device. The first terminal device may notify the second terminal device of the timing when the first terminal device sends the side link signal to the second terminal device when the synchronization source of the second terminal device is used as a reference. In this case, the second terminal device may determine to receive the side chain sent by the first terminal device according to the timing when the first terminal device sends the side link signal to the second terminal device when the synchronization source of the second terminal device is used as a reference. The timing of the road signal.

For example, when the reference synchronization timing difference is t1 and the timing at which the first terminal device sends the side link signal to the second terminal device is T, if the first synchronization source is the first network device and the second synchronization source is the second GNSS, The synchronization source of the first terminal device is the first GNSS, the synchronization source of the second terminal device is the third terminal device, and the synchronization timing difference between the first GNSS and the first network device is t2, the third terminal device and the second The synchronization timing difference between GNSS is t3, and when the third terminal device is used as a reference, the timing at which the first terminal device sends the side link signal to the second terminal device is (t1+t2+t3+T). The first terminal device may notify the second terminal device of the timing information for sending the side link signal during the process of establishing the side link link with the second terminal device, where the timing information is used to indicate (t1+t2+t3+T) .

For another example, when the reference synchronization timing difference is t1 and the timing at which the first terminal device sends the side link signal to the second terminal device is T, if the first synchronization source is the first network device, the second synchronization source is the second GNSS , The synchronization source of the first terminal device is the first network device, and the synchronization source of the second terminal device is the third terminal device, then when the second GNSS is used as a reference, the first terminal device sends a side link signal to the second terminal device The timing is t1+T. The first terminal device may notify the second terminal device of timing information for sending the sidelink signal during the process of establishing the sidelink link with the second terminal device, where the timing information is used to indicate t1+T.

It should be noted that this application is an embodiment where the first terminal device notifies the second terminal device that the first terminal device needs to obtain the second terminal device when the synchronization source used by the second terminal device for sidelink communication is used as a reference. The synchronization source or type of synchronization source used by the device for side link communication. For example, the synchronization source or the type of synchronization source used by the second terminal device for side link communication may be notified by the second terminal device to the first terminal device, or may be obtained by the first terminal device from the network device or the network management system Yes, there is no restriction on this.

In some other embodiments of the present application, the synchronization timing difference between the first synchronization source and the second synchronization source may also be determined by the second terminal device. For example, when the first synchronization source is the synchronization source used by the first terminal device for side link communication, and the second synchronization source is the synchronization source used by the second terminal device for side link communication, the first terminal device It is also possible to notify the second terminal device of the synchronization source and/or the type of synchronization source used when performing side link communication, so that the second terminal device can be based on the synchronization source used when the first terminal device performs side link communication And/or the type of synchronization source, and the synchronization source used in side-link communication with itself determine the synchronization timing difference.

In addition, when the first terminal device sends the side link signal to the second terminal device, the timing advance mechanism is adopted. For example, the timing of the first terminal device sending the side link signal to the second terminal device is determined according to the downlink timing and the uplink timing advance, that is, The first terminal device will send the side link signal to the second terminal device in advance. When the timing advance of the side link signal sent by the first terminal device to the second terminal device is large, it may affect the side chain of the previous time unit Channel signal or downlink signal reception. Taking the time unit as a time slot as an example, as shown in Figure 14, time slot n is used to receive side-link signals, time slot (n+1) is used to send side-link signals, and the time slot (n+ 1) There is an overlap with time slot n without timing advance, that is, the overlap between time slot (n+1) and time slot n, the transmission of the side link signal on time slot (n+1) will affect the time The reception of the side link signal on slot n, or the reception of the side link signal on slot n will affect the transmission of the side link signal on slot (n+1).

In view of this, the embodiment of the present application provides another communication method, so that when a terminal device uses a timing advance mechanism for side link communication, it can determine whether to communicate based on the side link timing advance, and the side link timing advance satisfies Under a certain condition, the terminal device can communicate again, which helps to reduce the influence on the reception of the downlink signal when the terminal device adopts the timing advance mechanism for side-link communication, thereby improving the communication performance. By way of example, the embodiment of the present application may perform communication based on the communication method shown in FIG. 11 in combination with the side link timing advance judgment, or may adopt the timing advance mechanism in the prior art method for side link communication Communicate with the judgment of the timing advance of the side link.

For example, based on the communication method shown in FIG. 11, a method of performing communication in conjunction with the side link timing advance judgment may be as shown in FIG. 15 and includes the following steps.

Step 1501: The first terminal device determines the timing of sending the side link signal to the second terminal device.

Wherein, the timing at which the first terminal device sends the sidelink signal to the second terminal device may be uplink timing, downlink timing, or timing based on the synchronization source of the first terminal device. Specifically, in the embodiment of the present application, the method for determining the timing at which the first terminal device sends the sidelink signal to the second terminal device may refer to the communication method shown in FIG. 11 for determining the first terminal device to send the sidelink signal to the second terminal device. The way for the timing of the channel signal may alternatively be a way for determining the timing of sending the side link signal in the prior art, which is not limited.

Step 1502: When the side link timing advance is less than or equal to the first threshold, the first terminal device sends the side link signal and/or the side link signal to the second terminal device according to the determined timing of sending the side link signal to the second terminal device. Or send an uplink signal to the network device.

It should also be noted that in step 1502, when the side link timing advance is less than the first threshold, the first terminal device may send the side link signal according to the determined timing of sending the side link signal to the second terminal device. Side link signal and/or uplink signal.

In some embodiments, when the side link timing advance is less than (or equal to) the first threshold, the first terminal device sends the side link signal in the same time unit according to the determined timing of sending the side link signal to the second terminal device. Road signal and uplink signal. It can be understood that when the side link timing advance is less than (or equal to) the first threshold, the first terminal device sends the side link signal to the second terminal device according to the determined timing of sending the side link signal to the second terminal device. The time unit of the channel signal to send the uplink signal.

In addition, because when the side link timing advance is less than (or equal to) the first threshold, the interference caused by the side link communication to the reception of the downlink signal is small or negligible, while the uplink signal and the side link signal use the same timing During transmission, the interference of the side link signal to the uplink signal can also be ignored. Therefore, in other embodiments, when the side link timing advance is less than (or equal to) the first threshold, the first terminal device may determine At the timing, the side link signal is sent at the time unit of sending the uplink signal to the second terminal device. In this way, the parallel transmission of the uplink signal and the side link signal is realized, and the signal transmission efficiency is improved.

It should be noted that when the side link timing advance is less than (or equal to) the first threshold, the first terminal device may also only send the side link signal or only the uplink signal. For example, when the side link timing advance is less than (or equal to) the first threshold, the first terminal device transmits the side link signal to the second terminal device according to the determined timing of sending the side link signal to the second terminal device. On the time unit of, the transmission of the uplink signal is dropped. That is, when the side link timing advance is less than (or equal to) the first threshold, the first terminal device may send the side link signal to the second terminal device according to the determined timing, but not send the uplink signal. For another example, when the side link timing advance is less than (or equal to) the first threshold, the first terminal device drops the transmission of the side link signal at the time unit for sending the uplink signal according to the determined timing. That is to say, when the side link timing advance is less than (or equal to) the first threshold, the first terminal device may send the uplink signal according to the determined timing, but not send the side link signal to the second terminal device.

In some other embodiments, when the side link timing advance is less than (or equal to) the first threshold, the first terminal device may determine whether to send the side link signal and the side link signal to the side link signal and signal at the same time unit based on the determined timing and the actual situation. The uplink signal is still one of the side link signal and the uplink signal.

In other embodiments, the communication method shown in FIG. 15 further includes step 1503. When the side link timing advance is greater than (or equal to) the first threshold, the first terminal device does not send the side link signal and/ Or not send uplink signals.

For example, when the side link timing advance is greater than (or equal to) the first threshold, the first terminal device may send one or both of the side link signal and the uplink signal at the same time unit according to the determined timing. send.

For example, when the side link timing advance is greater than the first threshold, the first terminal device does not send the side link signal to the second terminal device, but may send the uplink signal according to the determined timing. For example, the timing determined by the first terminal device to send the sidelink signal to the second terminal device is the first timing, where the first timing is determined according to the downlink timing and the uplink timing advance. For another example, when the side link timing advance is greater than the first threshold, the first terminal device does not send the side link signal to the second terminal device, and discards the uplink signal at the time unit when the side link signal is sent to the second terminal device . It can be understood that when the timing advance of the side link is greater than the first threshold, that is, the first terminal device neither sends a side link signal nor an uplink signal. For another example, when the side link timing advance is greater than the first threshold, the first terminal device sends the side link signal to the second terminal device according to the determined timing, but does not send the uplink signal.

The first threshold may be predefined by the protocol, or notified to the first terminal device by the network device, or determined by the first terminal device according to a preset algorithm, which is not limited. The network device may be a network device that receives the uplink signal sent by the first terminal device, or may be another network device, which is not limited.

For example, the first threshold may be characterized by the number of time units, where the time unit may refer to the relevant introduction of the foregoing embodiment. For example, the first threshold may be N symbols or time slots, and N is an integer. Among them, N can be a positive integer such as 1, 2.

For another example, the first threshold may be an absolute time, and the time unit may be microseconds (us), T _s , T _c , or the like. Among them, T _s =1/(Δf _ref ·N _f,ref ), Δf _ref =1·10 ³ Hz; T _c =1/(Δf _max ·N _f ), Δf _max is the maximum subcarrier spacing, for example, Δf _max =480·10 ³ Hz, N _f,ref is the number of Fourier transform points, for example, N _f,ref =2048. For example, taking the time unit as us as an example, the first threshold may be 3 us, or 5 us. For another example, taking the time unit as T _s as an example, the first threshold may be 3T _s , or 7T _s . For another example, the first threshold may be t us, x T _s , y T _c, etc., where t, s, and y may be integers.

As another example, the first threshold may be determined by the first terminal device according to the first system parameter, where the first system parameter is a system parameter used to send the side link signal. Specifically, the first system parameter may be understood as the system parameter used when the first terminal device sends the side link signal to the second terminal device.

It should be noted that the first terminal device in the embodiment of the present application can support one or more system parameters. For example, in the NR system, the first terminal device can support 5 system parameters, numbered from 0 to 4 respectively. Table 1 shows. The sub-carrier interval included in the system parameter corresponding to number 0 is 15 kHz, the CP type is normal CP, the sub-carrier interval included in the system parameter corresponding to number 1 is 30 kHz, the CP type is normal CP, and the system parameter corresponding to number 2 includes The subcarrier interval of the CP type is 60kHz, the CP type is normal CP or extended CP, the subcarrier interval included in the system parameter corresponding to number 3 is 120kHz, the CP type is normal CP, and the subcarrier interval included in the system parameter corresponding to number 4 is 240kHz, CP type is normal CP.

Table 1

Take the system parameters shown in Table 1 as an example, under different system parameters, the number of symbols included in each slot

The number of time slots included in each subframe

And the number of time slots included in each radio frame

As shown in table 2. among them,

Represents the number of symbols included in a slot, and the symbol number (or called index) in the slot can be

Indicates the number of time slots included in a wireless frame when the number of the system parameter is μ, and the number of time slots in a wireless frame (or called index)

Can be

Indicates the number of time slots included in a subframe when the number of the system parameter is μ, and the number of time slots in a subframe can be

Table 2

In some embodiments, the first threshold is determined according to the first system parameter and the reference threshold, where the reference threshold is a threshold corresponding to the reference system parameter. For example, the reference threshold may be sent by the network device to the first terminal device, or may also be predefined. Wherein, the reference system parameter may be predefined, or may be sent by the network device to the first terminal device, which is not limited.

Taking the system parameter as the subcarrier interval as an example, for example, the reference system parameter is the subcarrier interval of 15kHz, and the reference threshold is T0×Ts. The relationship between the threshold N corresponding to other system parameters and the reference threshold is N=T0/2 ^μ ×Ts. μ is the number of the system parameter. For example, μ1 is the number of the first system parameter, then the first threshold N1=T0/2 ^μ1 ×Ts. The foregoing is only an example of a method for determining the first threshold based on the first system parameter and the reference threshold, and does not limit the method for determining the first threshold based on the first system parameter and the reference threshold.

For example, the terminal device may determine the first threshold according to the first system parameter, the reference system parameter, and the reference threshold.

Take the system parameter as the subcarrier spacing as an example. For example, the number of the reference system parameter is μ _f , and the reference threshold corresponding to the reference system parameter is Pf. If the number of the first system parameter is μ, the first terminal device may determine the algorithm corresponding to the reference threshold corresponding to the reference system parameter according to μ, and then determine the first threshold according to the determined algorithm. For example, the algorithm between the first threshold corresponding to the system parameter number μ and the reference threshold corresponding to the reference system parameter number μ _f is the first algorithm, and the first terminal device determines the first algorithm based on the reference threshold according to the reference threshold. One threshold. For example, if μ _f > μ, then P=Pf*(μ _f- μ); if μ _f <μ, then P=Pf/(μ _f- μ).

In addition, the first algorithm may be other mathematical operation rules, such as one or more of algorithms such as addition, subtraction, multiplication, division, power, and logarithm. For example, the first algorithm can be

or

Or P=Pf/(μ-μ _f ), or P=Pf·(μ-μ _f ), where μ-μ _f can also be |μ-μ _f |, or μ _f -μ, etc. The first algorithm may be predefined by the protocol, or notified by the network device of the terminal device, or obtained through pre-configured parameters, or determined by other methods, etc., which is not limited. The foregoing is only an example of a method for determining the first threshold based on the first system parameter and the reference threshold, and does not limit the method for determining the first threshold based on the first system parameter and the reference threshold.

In another embodiment, the first system parameter belongs to a preset system parameter set, wherein the system parameter set corresponds to one or more thresholds, and the first threshold is that the first terminal device is within one or more thresholds according to the first system parameter. OK. It should be noted that the system parameter set includes one or more system parameters. Wherein, one or more system parameters included in the system parameter set may be system parameters supported by the first terminal device, or may be all system parameters. It should be understood that each system parameter in the embodiment of the present application may correspond to a threshold, and the thresholds corresponding to different system parameters may be the same or different, and the comparison is not limited. For example, the system parameter set and/or one or more thresholds corresponding to the system parameter set may be predefined in the first terminal device through a protocol, or may be notified to the first terminal device by the network device. For example, the system parameter set is pre-defined through a protocol and stored in the first terminal device, and one or more thresholds corresponding to the system parameter set are notified by the network device to the first terminal device. For another example, the system parameter set and one or more thresholds corresponding to the system parameter set are predefined through a protocol and stored in the first terminal device. For another example, the system parameter set and one or more thresholds corresponding to the system parameter set are notified by the network device to the first terminal device.

Take the system parameter as the subcarrier interval as an example. For example, the system parameter set includes the subcarrier interval of 15kHz, 30kHz, 60kHz and 120kHz. The threshold corresponding to 15kHz is T0×Ts, the threshold corresponding to 30kHz is T1×Ts, and the threshold corresponding to 60kHz is T0×Ts. The threshold is T2×Ts, and the threshold corresponding to 120kHz is T3×Ts. For example, if the first system parameter is 30kHz sub-carrier spacing, the first threshold is T1×Ts.

In addition, when the timing advance of the side link signal sent by the first terminal device to the second terminal device is large, it may affect the reception of the side link signal or downlink signal in the previous time unit. In view of this, The embodiment of the present application also provides a communication method, so that when a terminal device uses a timing advance mechanism for side link communication, it can determine whether to use the timing advance mechanism when communicating based on the side link timing advance. If the side link timing advance If the amount meets a certain condition, the terminal device uses the timing advance mechanism for side link communication, which helps to improve the communication performance. For example, the embodiment of the present application performs communication based on the communication method shown in FIG. 11 in combination with the side link timing advance judgment, and may also be combined with the method in the prior art that uses the timing advance mechanism for side link communication The side link timing advance is judged for communication.

For example, based on the communication method shown in FIG. 11, the method of performing communication in conjunction with the side link timing advance judgment may be as shown in FIG. 16 and includes the following steps.

Step 1601: The first terminal device determines the timing of the side link signal sent to the second terminal device.

Step 1602: When the sidelink timing advance is less than or equal to the second threshold, the first terminal device sends the sidelink signal to the second terminal device and/or sends the uplink signal to the network device according to the determined timing.

Wherein, step 1602 can be understood as that when the sidelink timing advance is less than or equal to the second threshold, the first terminal device may use the timing advance mechanism to send the sidelink signal and/or uplink signal.

It should also be noted that, in step 1602, the first terminal device may also send the side link signal and/or the uplink signal according to the determined timing when the side link timing advance is less than the second threshold.

In some embodiments, when the side link timing advance is less than (or equal to) the second threshold, the first terminal device transmits the side link signal and the uplink signal in the same time unit according to the determined timing. It can be understood that, when the side link timing advance is less than (or equal to) the second threshold, the first terminal device sends an uplink signal at the time unit of sending the side link signal to the second terminal device according to the determined timing; or When the side link timing advance is less than (or equal to) the second threshold, the first terminal device sends the side link signal at the time unit of sending the uplink signal to the second terminal device according to the determined timing. Thus, the parallel transmission of the uplink signal and the side link signal is realized, and the signal transmission efficiency is improved.

It should be noted that when the side link timing advance is less than (or equal to) the second threshold, the first terminal device may also only send the side link signal or only the uplink signal. For example, when the side link timing advance is less than (or equal to) the second threshold, the first terminal device drops the uplink signal at the time unit of sending the side link signal to the second terminal device according to the determined timing Sent. That is, when the side link timing advance is less than (or equal to) the second threshold, the first terminal device may send the side link signal to the second terminal device according to the determined timing, but not send the uplink signal. For another example, when the side link timing advance is less than (or equal to) the second threshold, the first terminal device drops the transmission of the side link signal at the time unit for sending the uplink signal according to the determined timing. That is, when the side link timing advance is less than (or equal to) the second threshold, the first terminal device may send an uplink signal according to the determined timing, but not send a side link signal to the second terminal device.

In other embodiments, the communication method shown in FIG. 16 further includes step 1603. When the side link timing advance is greater than (equal to) the second threshold, the first terminal device does not use the timing advance mechanism to send the side link signal and / Or uplink signal; or, send the side link signal and/or the uplink signal according to the first timing. The first timing may be determined according to the second threshold.

For example, when the side-link timing advance is greater than (equal to) the second threshold, the first terminal device may use the second threshold as the side-link timing advance, and determine the first timing according to the first threshold and the downlink timing. At a certain time, send side link signals and/or uplink signals. It can be understood that when the side link timing advance is greater than (or equal to) the second threshold, the side link signal and/or the uplink signal are sent according to the first timing. For example, when the side link timing advance is greater than (equal to) the second threshold, the first terminal device may send the side link signal according to the first timing and not send the uplink signal. For another example, when the side link timing advance is greater than (equal to) the second threshold, the first terminal device may send the uplink signal according to the first timing, but not the side link signal. For another example, when the side link timing advance is greater than (equal to) the second threshold, the first terminal device may send the side link signal and the uplink signal according to the first timing.

In other embodiments, when the side link timing advance is greater than (equal to) the second threshold, the first terminal device may send the side link signal and/or the uplink signal according to the downlink timing. It can be understood that when the side-link timing advance is greater than (or equal to) the second threshold, the timing advance mechanism is not used, and the side-link signal and/or the uplink signal are sent. For example, when the side link timing advance is greater than (equal to) the second threshold, the first terminal device may send the side link signal according to the downlink timing, but not the uplink signal. For another example, when the side link timing advance is greater than (equal to) the second threshold, the first terminal device may send the uplink signal according to the downlink timing, but not send the side link signal. For another example, when the side link timing advance is greater than (equal to) the second threshold, the first terminal device may send the side link signal and the uplink signal according to the downlink timing.

In still other embodiments, when the sidelink timing advance is greater than (equal to) the second threshold, the first terminal device may send the uplink signal according to the uplink timing, and/or send the sidelink signal according to the downlink timing. The uplink timing is determined based on the downlink timing and the uplink timing advance. It can be understood that when the sidelink timing advance is greater than (equal to) the second threshold, the first terminal device uses the uplink timing advance mechanism to send uplink signals, and does not use the uplink timing advance mechanism to send sidelink signals.

It should be noted that the method for determining the second threshold in the embodiment of the present application may refer to the method for determining the first threshold in the communication method shown in FIG. 15, which is not repeated here. Among them, the first threshold and the second threshold may be the same or different, which is not limited.

In addition, for any of the foregoing embodiments of the present application, when the network device configures the first terminal device with time-frequency resources for Uu air interface communication and side link communication, it may also instruct the first terminal device to reserve the last of the time units One or more symbols or time slots, etc., thereby helping to reduce the interference of the transmission of side-link signals or uplink signals on the reception of downlink signals.

For example, for mode 1, such as the side-link network device scheduling mode, the network device instructs the first terminal device to not schedule downlink signals and receive side-link signals in one or more symbols or time slots before the time unit for sending side-link signals. Link signal. For another example, for mode 2, such as the autonomous selection mode of the side link terminal device, the first terminal device sends the side link signal to the network device to assist the network device instructing the first terminal device to schedule downlink signals and/or receive Symbols that need to be reserved in the time unit of the side link signal.

In some embodiments of the present application, the first terminal device may also notify the network device of information related to the side link communication between the first terminal device and the second terminal device, so that the network device can better serve the first terminal device and the second terminal device. The second terminal device schedules resources to meet the needs of side link communication or Uu air interface communication.

Since in the embodiments of the present application, the types of side link communication include broadcast, multicast, and unicast, in some embodiments, the first terminal device may also determine whether to adopt the timing advance mechanism according to the type of side link communication Send side link signal. For example, when the type of side link communication is unicast or multicast, the first terminal device may use a timing advance mechanism to send the side link signal to the second terminal device. For example, the first terminal device sends a side link signal to the second terminal device according to the uplink timing. The second terminal device may receive the side link signal sent by the first terminal device according to the uplink timing. The uplink timing is determined according to the downlink timing and the uplink timing advance.

In an example, when the type of side link communication is broadcast, in some embodiments, the first terminal device may not use a timing advance mechanism to send a broadcast side link signal. For example, the first terminal device may send a broadcast sidelink signal according to the downlink timing. The second terminal device may receive the broadcast sidelink signal sent by the first terminal device according to the downlink timing. Wherein, the broadcast side link signal may refer to a side link signal whose type of side link communication is broadcast.

The various embodiments in this application can be used alone or in combination with each other to achieve different technical effects.

In the above-mentioned embodiments provided in the present application, the communication method provided in the embodiments of the present application is introduced from the perspective of a terminal device as an execution subject. In order to realize the functions in the communication method provided in the above embodiments of the present application, the terminal device may include a hardware structure and/or a software module, and realize the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether one of the above-mentioned functions is executed in a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraint conditions of the technical solution.

Similar to the above-mentioned concept, as shown in FIG. 17, an embodiment of the present application further provides an apparatus 1700, which includes a transceiver module 1702 and a processing module 1701.

In an example, the apparatus 1700 is configured to implement the function of the first terminal device in the foregoing method. The device may be the first terminal device or a device in the first terminal device. Among them, the device may be a chip system. In the embodiments of the present application, the chip system may be composed of chips, or may include chips and other discrete devices.

The processing module 1701 is configured to determine that the timing of sending the side link signal to the second terminal device is the uplink timing, and the uplink timing is the timing of the device 1700 sending the uplink signal, and the side link signal includes side link control information and Sidelink data; the transceiver module 1702 is configured to send the sidelink signal to the second terminal device according to the uplink timing.

In an example, the apparatus 1700 is used to implement the function of the second terminal device in the foregoing method. The device may be the second terminal device or a device in the second terminal device. Among them, the device may be a chip system. In the embodiments of the present application, the chip system may be composed of chips, or may include chips and other discrete devices.

Wherein, the transceiver module 1702 is used to receive side link link establishment signaling sent by the first terminal device; wherein, the side link link establishment signaling includes timing information, and the timing information is used to indicate the first terminal The timing at which the device sends the side link signal to the apparatus 1700; the side link signal includes side link control information and side link data; the side link link establishment signaling is used for the first terminal device request Establish a side link link with the apparatus 1700, or the side link connection establishment signaling is used by the first terminal device to respond to a request of the apparatus 1700 to establish a side link link; the processing module 1701 is used to, according to the timing information, The trigger transceiver module 1702 receives the side link signal sent by the first terminal device.

For the specific execution process of the processing module 1701 and the transceiver module 1702, please refer to the record in the above method embodiment. The division of modules in the embodiments of the present application is illustrative, and is only a logical function division. In actual implementation, there may be other division methods. In addition, the functional modules in the various embodiments of the present application may be integrated into one process. In the device, it can also exist alone physically, or two or more modules can be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or software functional modules.

Similar to the foregoing concept, as shown in FIG. 18, an embodiment of the present application further provides an apparatus 1800.

In an example, the device 1800 is used to implement the function of the first terminal device in the foregoing method. The device may be a terminal device or a device in a terminal device. The apparatus 1800 includes at least one processor 1801, configured to implement the function of the first terminal device in the foregoing method. For example, the processor 1801 may be configured to determine that the timing of sending the sidelink signal to the second terminal device is the uplink timing. For details, refer to the detailed description in the method, which will not be described here.

In some embodiments, the device 1800 may further include at least one memory 1802 for storing program instructions and/or data. The memory 1802 is coupled with the processor 1801. The coupling in the embodiments of the present application is an interval coupling or a communication connection between devices, units or modules, and may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules. As another implementation, the memory 1802 may also be located outside the apparatus 1800. The processor 1801 may cooperate with the memory 1802 to operate. The processor 1801 may execute program instructions stored in the memory 1802. At least one of the at least one memory may be included in the processor.

In some embodiments, the apparatus 1800 may further include a communication interface 1803 for communicating with other devices through a transmission medium, so that the apparatus used in the apparatus 1800 can communicate with other devices. Exemplarily, the communication interface 1803 may be a transceiver, circuit, bus, module, or other type of communication interface, and the other device may be a second terminal device or a network device. The processor 1801 uses the communication interface 1803 to send and receive data, and is used to implement the method in the foregoing embodiment. Exemplarily, the communication interface 1803 may be used to send a side link signal to the second terminal device according to uplink timing.

In an example, the device 1800 is used to implement the function of the second terminal device in the foregoing method. The device may be a terminal device or a device in a terminal device. The apparatus 1800 has at least one processor 1801, configured to implement the function of the second terminal device in the foregoing method. For example, the processor 1801 may be configured to determine the timing of receiving the side link signal sent by the first terminal device according to the timing information. For details, refer to the detailed description in the method, which will not be described here.

In some embodiments, the device 1800 may further include at least one memory 1802 for storing program instructions and/or data. The memory 1802 is coupled with the processor 1801. The coupling in the embodiments of the present application is an interval coupling or a communication connection between devices, units or modules, which can be electrical, mechanical or other forms, and is used for information exchange between devices, units or modules. As another implementation, the memory 1802 may also be located outside the apparatus 1800. The processor 1801 may cooperate with the memory 1802 to operate. The processor 1801 may execute program instructions stored in the memory 1802. At least one of the at least one memory may be included in the processor.

In some embodiments, the apparatus 1800 may further include a communication interface 1803 for communicating with other devices through a transmission medium, so that the apparatus used in the apparatus 1800 can communicate with other devices. Exemplarily, the communication interface 1803 may be a transceiver, circuit, bus, module, or other type of communication interface, and the other device may be a second terminal device or a network device. The processor 1801 uses the communication interface 1803 to send and receive data, and is used to implement the method in the foregoing embodiment. Exemplarily, the communication interface 1803 may be used to receive the side link signal sent by the first terminal device according to timing information.

The embodiment of the present application does not limit the connection medium between the communication interface 1803, the processor 1801, and the memory 1802. For example, in the embodiment of the present application in FIG. 18, the memory 1802, the processor 1801, and the communication interface 1803 may be connected by a bus, and the bus may be divided into an address bus, a data bus, and a control bus.

In the embodiments of the present application, the processor may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, and may implement or Perform the methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor.

In the embodiment of the present application, the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or a volatile memory (volatile memory), for example Random-access memory (random-access memory, RAM). The memory is any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto. The memory in the embodiments of the present application may also be a circuit or any other device capable of realizing a storage function, for storing program instructions and/or data.

The methods provided in the embodiments of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present invention are generated in whole or in part. The computer may be a general-purpose computer, a dedicated computer, a computer network, network equipment, user equipment, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server, or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center integrated with one or more available media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a digital video disc (digital video disc, DVD for short)), or a semiconductor medium (for example, SSD).

Obviously, those skilled in the art can make various changes and modifications to the application without departing from the scope of the application. In this way, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application also intends to include these modifications and variations.

Claims

A communication method, characterized in that the method includes:

The first terminal device determines that the timing for sending the side link signal to the second terminal device is uplink timing, and the side link signal includes side link control information and side link data;

The first terminal device sends the sidelink signal to the second terminal device according to the uplink timing.
The method according to claim 1, wherein the side link control information and the side link data are located in the same time unit.
The method according to claim 1 or 2, wherein the timing of sending the sidelink signal to the second terminal device is determined according to downlink timing and uplink timing advance.
The method according to any one of claims 1 to 3, wherein the method further comprises:

The first terminal device sends a side link link establishment signaling to the second terminal device, where the side link link establishment signaling includes timing information, and the timing information is used to indicate to the second terminal device The timing of sending the side link signal;

Wherein, the side link link establishment signaling is used for the first terminal device to request the establishment of a side link link with the second terminal device, or the side link link establishment signaling is used for the first terminal device. The terminal device responds to the request of the second terminal device to establish a side link link.
The method according to claim 4, wherein the method further comprises:

Sending, by the first terminal device, a synchronization timing difference to the second terminal device, the synchronization timing difference being the difference between the timing based on the first synchronization source and the timing based on the second synchronization source;

The first synchronization source is a first network device or a first global navigation satellite system GNSS; the second synchronization source is a second network device, a second GNSS or a third terminal device.
The method according to claim 5, wherein the first synchronization source is a synchronization source used by the first terminal device for side-link communication; and the second synchronization source is the second terminal The synchronization source used by the device for side link communication.
The method according to any one of claims 1 to 6, wherein the method further comprises:

The first terminal device transmits an uplink signal in a time unit for transmitting the sidelink signal according to the uplink timing.
The method according to any one of claims 1 to 7, wherein the first terminal device sending the side link signal to the second terminal device according to the uplink timing comprises:

When the side link timing advance is less than or equal to the first threshold, the first terminal device sends the side link signal to the second terminal device according to the uplink timing.
The method according to claim 8, wherein the first threshold is determined by the first terminal device according to a first system parameter, and the first system parameter is used to send the side link signal System parameters.
The method according to claim 9, wherein the first threshold is also determined according to a reference threshold;

Wherein, the reference threshold is a threshold corresponding to a reference system parameter.
The method according to claim 9, wherein the first system parameter belongs to a preset system parameter set, the system parameter set corresponds to one or more thresholds, and the first threshold is the first The terminal device is determined in the one or more thresholds according to the first system parameter.
The method according to any one of claims 8 to 11, wherein the method further comprises:

When the side link timing advance is greater than the first threshold, the first terminal device determines to send the side link signal to the second terminal device according to the first threshold and the downlink timing The timing is the first timing;

The first terminal device sends the side link signal to the second terminal device according to the first timing.
The method according to any one of claims 8 to 11, wherein the method further comprises:

When the side link timing advance is greater than the first threshold,

The first terminal device sends the side link signal to the second terminal device according to the downlink timing; or the first terminal device discards the sending of the side link signal.
The method according to claim 12 or 13, wherein the first terminal device discards the transmission of the uplink signal in the time unit for transmitting the sidelink signal.
The method according to any one of claims 1 to 14, wherein the communication mode for the first terminal device to send the side link signal to the second terminal device is multicast or unicast.
A communication method, characterized in that the method includes:

The second terminal device receives the side link link establishment signaling sent by the first terminal device, where the side link link establishment signaling includes timing information, and the timing information is used to instruct the first terminal device to send to the first terminal device 2. The timing at which the terminal device sends the side link signal; the side link signal includes side link control information and side link data;

The side link link establishment signaling is used for the first terminal device to request the establishment of a side link link with the second terminal device, or the side link connection establishment signaling is used for the first terminal device Responding to the request of the second terminal device to establish a side link link;

The second terminal device receives the side link signal sent by the first terminal device according to the timing information.
The method according to claim 16, wherein the timing at which the first terminal device sends the side link signal to the second terminal device is an uplink timing.
The method of claim 16 or 17, wherein the method further comprises:

The second terminal device receives the synchronization timing difference sent by the first terminal device; the synchronization timing difference is the timing difference between the timing based on the first synchronization source and the timing based on the second synchronization source;

The first synchronization source is a first network device or a first global navigation satellite system GNSS; the second synchronization source is a second network device, a second GNSS or a third terminal device.
The method of claim 18, wherein the second terminal device receiving the side link signal sent by the first terminal device according to the timing information comprises:

Determining, according to the timing information and the synchronization timing difference, the second terminal device to receive the timing at which the first terminal device sends the side link signal;

The second terminal device receives the side link signal sent by the first terminal device according to the timing of receiving the side link signal sent by the first terminal device.
The method according to claim 18 or 19, wherein the first synchronization source is a synchronization source used by the first terminal device for side-link communication; and the second synchronization source is the first synchronization source. 2. The synchronization source used by the terminal equipment for side link communication.
A device, characterized by being used to implement the method according to any one of claims 1 to 20.
A device, characterized by comprising a processor and a memory, the memory stores instructions, and when the processor executes the instructions, the device executes the method according to any one of claims 1 to 20.
A computer-readable storage medium, wherein the computer-readable storage medium stores instructions, which when run on a computer, cause the computer to execute the method according to any one of claims 1 to 20.