Lateral transmission method, device, equipment, medium and program product

Abstract

The application of the invention is a divisional application of 202280089120.6. The invention discloses a sidewalk transmission method, device and equipment, a medium and a product, and belongs to the field of sidewalk communication. The method comprises: when a transmission condition is satisfied, a first terminal performs side transmission on a first time domain unit (902); wherein the transmission condition comprises that the first terminal has authorized transmission resources on the first time domain unit, and the channel access executed by the first terminal before the first time domain unit is successful.

Description

[0001] This application is a divisional application of the invention patent application with the application date of March 11, 2022, application number 202280089120.6, and invention name "Side transmission method, device, equipment, medium and program product". Technical Field

[0002] The present application relates to the field of sideline communications, and in particular to a sideline transmission method, device, equipment, medium and program product. Background Art

[0003] In order to realize direct communication between terminals in the Vehicle to Everything (V2X) system, the SideLink (SL) transmission method is introduced.

[0004] Related technologies provide related technologies for using licensed spectrum for side-stream transmission. However, how to use unlicensed spectrum for side-stream transmission is a technical problem that needs to be solved urgently. Summary of the invention

[0005] The embodiments of the present application provide a side transmission method, device, equipment, medium and program product. The technical solution is as follows:

[0006] According to one aspect of an embodiment of the present application, a sideline communication method is provided, the method being performed by a first terminal, the first terminal using an unlicensed spectrum for sideline communication, the method comprising:

[0007] When the transmission condition is met, the first terminal performs side transmission on the first time domain unit;

[0008] The transmission condition includes: the first terminal has authorized transmission resources in the first time domain unit, and the channel access performed by the first terminal before the first time domain unit is successful.

[0009] According to another aspect of an embodiment of the present application, a side transmission device is provided, the device comprising:

[0010] A transceiver module, configured to perform side transmission on the first time domain unit when a transmission condition is met;

[0011] The transmission condition includes: the first terminal has authorized transmission resources in the first time domain unit, and the channel access performed by the first terminal before the first time domain unit is successful.

[0012] According to another aspect of an embodiment of the present application, a terminal is provided, the terminal comprising:

[0013] processor;

[0014] a transceiver connected to the processor;

[0015] The processor is configured to load and execute executable instructions to implement the sideline communication method as described in the above aspects.

[0016] According to another aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which at least one instruction, at least one program, a code set or an instruction set is stored, and the at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by a processor to implement the side communication method as described in the above aspects.

[0017] According to another aspect of an embodiment of the present application, a computer program product (or computer program) is provided, wherein the computer program product (or computer program) includes computer instructions, and the computer instructions are stored in a computer-readable storage medium; a processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the side communication method as described in the above aspects.

[0018] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0019] By performing side transmission on the first time domain unit when the first terminal has authorized transmission resources and the channel access performed before the first time domain unit is successful, the first terminal can conditionally use the unlicensed spectrum for side communication, thereby realizing side communication based on the unlicensed spectrum.

[0020] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 is a block diagram of a side transmission system provided by an exemplary embodiment of the present application;

[0023] Figures 2 to 4 is a schematic diagram of three side transmission scenarios provided by an exemplary embodiment of the present application;

[0024] Figure 5 is a schematic diagram of a scenario of side transmission with a central control node provided by an exemplary embodiment of the present application;

[0025] Figure 6 is a schematic diagram of a frame structure of sideline transmission within a time slot provided by an exemplary embodiment of the present application;

[0026] Figure 7 is a schematic diagram of an LBT method in different transmission scenarios according to another exemplary embodiment;

[0027] Figure 8 is a time-frequency resource diagram of a fixed frame period according to an exemplary embodiment;

[0028] Fig. 9 is a flow chart of a side transmission method according to an exemplary embodiment;

[0029] Fig.10 is a schematic diagram showing channel access immediately following a first time domain unit according to an exemplary embodiment;

[0030] Fig.11 is a schematic diagram showing channel access immediately following a first time domain unit according to another exemplary embodiment;

[0031] Fig.12 is a time-frequency diagram of channel occupancy duration and idle time at the symbol level according to an exemplary embodiment;

[0032] Fig.13 is a block diagram of a side transmission device according to an exemplary embodiment;

[0033] Fig.14 It is a schematic diagram of the structure of a terminal according to an exemplary embodiment. DETAILED DESCRIPTION

[0034] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same reference numerals in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0035] Vehicle to everything (V2X) is a key technology for future intelligent transportation systems. It mainly studies vehicle data transmission solutions based on the 3rd Generation Partnership Project (3GPP) communication protocol. V2X communication includes vehicle to vehicle (V2V) communication, vehicle to roadside infrastructure (V2I) communication, and vehicle to pedestrian (V2P) communication. V2X applications will improve driving safety, reduce congestion and vehicle energy consumption, and improve traffic efficiency. V2X belongs to a type of device to device (D2D) communication method. The D2D communication method is a method that allows direct communication between different terminals.

[0036] Sidelink communication is a communication method introduced in the device to device (D2D) application scenario, which is expanded and enhanced in the V2X system. Sidelink is a new link type introduced to support direct communication between devices, with higher spectrum efficiency and lower transmission latency. Compared with Uu interface communication, sidelink communication has the characteristics of short latency and low overhead, and is very suitable for direct communication between vehicle-mounted devices and other peripheral devices with close geographical locations. The sidelink communication mentioned in this application supports all scenarios applicable to sidelink communication, such as at least one of D2D and V2X.

[0037] With the development of 5G mobile communication technology, 3GPP R16 proposed to use 5G New Radio (NR) technology to support new vehicle networking communication services and scenarios, such as supporting fleet management (VehiclesPlatooning), perception extension (Extended Sensors), advanced driving (Advanced Driving), and remote driving (Remote Driving). In general, 5G V2X can provide higher communication rates, shorter communication delays, and more reliable communication quality.

[0038] Figure 1 A schematic diagram of a side transmission system provided by an exemplary embodiment of the present application is shown. The side transmission system may include: a core network 11, an access network 12 and a terminal 13.

[0039] The core network 11 includes several core network devices. The functions of the core network devices are mainly to provide user connection, user management, and service bearing, and to provide an interface to the external network as a bearer network. For example, the core network of the fifth generation mobile communication technology (5th Generation, 5G) NR system may include access and mobility management function (Access and Mobility Management Function, AMF) entity, user plane function (User Plane Function, UPF) entity and session management function (Session Management Function, SMF) entity and other devices.

[0040] The access network 12 includes several access network devices 14. The access network in the 5G NR system can be called a new generation of radio access network (NG-RAN). The access network device 14 is a device deployed in the access network 12 to provide wireless communication functions for the terminal 13. The access network device 14 may include various forms of macro base stations, micro base stations, relay stations, access points, etc. In systems using different wireless access technologies, the names of devices with access network device functions may be different. For example, in the 5G NR system, it is called a 5G base station (Next Generation Node B, gNodeB or gNB). With the evolution of communication technology, the name "access network device" may change. For the convenience of description, in the embodiments of the present application, the above-mentioned devices that provide wireless communication functions for the terminal 13 are collectively referred to as access network devices.

[0041] The number of terminals 13 is usually multiple, and one or more terminals 13 can be distributed in each cell managed by an access network device 14. The terminal 13 may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem, as well as various forms of user equipment, mobile stations (MS), etc. For the convenience of description, the above-mentioned devices are collectively referred to as terminals. The access network device 14 and the core network device communicate with each other through some air technology, such as the NG interface in the 5G NR system. The access network device 14 and the terminal 13 communicate with each other through some air technology, such as the Uu interface.

[0042] Terminals 13 and 13 (for example, vehicle-mounted devices and other devices (such as other vehicle-mounted devices, mobile phones, road side units (RSU)), etc.)) can communicate with each other through a direct communication interface (such as a PC5 interface). Accordingly, the communication link established based on the direct communication interface can be called a direct link or a side link (Sidelink, SL). Side communication refers to the direct communication and data transmission between terminals through side links. Different from the traditional cellular system in which communication data is received or sent through access network equipment, side communication has the characteristics of short delay and low overhead, and is suitable for communication between two terminals with close geographical locations (such as vehicle-mounted devices and other peripheral devices with close geographical locations). It should be noted that in Figure 1 In the present application, only the vehicle-to-vehicle communication in the V2X scenario is used as an example, and the SL technology can be applied to the scenarios where various terminals communicate directly with each other. In other words, the terminal in this application refers to any device that communicates using the SL technology.

[0043] The "5G NR system" in the embodiment of the present application may also be referred to as a 5G system or an NR system, but those skilled in the art may understand its meaning. The technical solution described in the embodiment of the present application may be applicable to a 5G NR system or to a subsequent evolution system of the 5G NR system.

[0044] The UE and the terminal in the embodiment of the present application have the same meaning and can be replaced with each other. The network side in the embodiment of the present application can be understood as at least one of the access network, the core network, the access network equipment and the core network equipment.

[0045] In sidelink communication, according to the network coverage of the communicating terminals, it can be divided into sidelink communication within network coverage, sidelink communication with partial network coverage and sidelink communication outside network coverage.

[0046] Figure 2 A schematic diagram of the sideline communication network architecture within the network coverage is shown. All terminals 13 performing sideline communication are within the coverage of the same access network device 14, and all terminals 13 can perform sideline communication based on the same sideline configuration by receiving configuration signaling from the access network device 14.

[0047] Figure 3A schematic diagram of a sidelink communication network architecture with partial network coverage is shown. The first terminal 131 performing sidelink communication is located within the coverage of the base station. The first terminal 131 can receive the configuration signaling of the access network device 14 and perform sidelink communication according to the configuration of the access network device 14. The third terminal 132 located outside the network coverage cannot receive the configuration signaling of the access network device 14. In this case, the third terminal 132 outside the network coverage will determine the sidelink configuration according to the pre-configuration information and the information carried in the Physical Sidelink Broadcast Channel (PSBCH) sent by the first terminal 131 located within the network coverage, and perform sidelink communication.

[0048] Figure 4 A schematic diagram of a network architecture for sideline communication outside the network coverage is shown. All terminals 13 performing sideline communication are located outside the network coverage, and all terminals 13 determine the sideline configuration according to the pre-configuration information to perform sideline communication.

[0049] Figure 5 : For side communication with a central control node, multiple terminals 13 constitute a communication group. The communication group has a central control node, which can also become a cluster head terminal (Cluster Header, CH). The central control node has one of the following functions: responsible for the establishment of the communication group; the joining and leaving of group members; coordinating resources, allocating side transmission resources to other terminals, and receiving side feedback information from other terminals 13; coordinating resources with other communication groups, etc.

[0050] Regarding sideline communications, 3GPP defines two transmission modes: a first mode and a second mode.

[0051] The first mode (also known as mode A or mode 1 or mode 3 or base station scheduling mode): the transmission resources of the terminal are allocated by the access network device (such as a base station), and the terminal transmits communication data on the side link according to the transmission resources allocated by the access network device, wherein the access network device can allocate transmission resources for a single transmission to the terminal, also known as dynamically allocated side transmission resources; the access network device can also allocate transmission resources for semi-static transmission to the terminal, also known as semi-statically allocated side transmission resources.

[0052] The second mode (also known as mode B or mode 2 or mode 4 or UE autonomous resource selection mode): the terminal selects transmission resources from a pre-configured or network-configured resource pool to transmit communication data. Specifically, the terminal can select transmission resources from the resource pool by listening, or by random selection.

[0053] In NR-V2X, the frame structure of a time slot is as follows Figure 6 shown. Figure 6 (a) shows a time slot structure in which the PSFCH is not included in the time slot; Figure 6 (b) shows the time slot structure including PSFCH in the time slot.

[0054] The Physical Sidelink Control Channel (PSCCH) in NR-V2X starts from the second sidelink symbol of a time slot in the time domain, occupies 2 or 3 Orthogonal Frequency-Division Multiplexing (OFDM) symbols, and can occupy {10, 12 15, 20, 25} Physical Resource Blocks (PRBs) in the frequency domain. In order to reduce the complexity of the terminal's blind detection of PSCCH, only one number of PSCCH symbols and PRBs are allowed to be configured in a resource pool. In addition, because the sub-channel is the minimum granularity of the physical sidelink shared channel (PSSCH) resource allocation in NR-V2X, the number of PRBs occupied by PSCCH must be less than or equal to the number of PRBs contained in a sub-channel in the resource pool, so as to avoid additional restrictions on PSSCH resource selection or allocation. PSSCH also starts from the second side symbol of the time slot in the time domain. The last symbol in the time slot is the guard period (GP) symbol, and the remaining symbols are mapped to PSSCH. The first side symbol in the time slot is a repetition of the second side symbol. Usually, the receiving terminal uses the first side symbol as an automatic gain control (AGC) symbol, and the data on this symbol is usually not used for data demodulation. PSSCH occupies K subchannels in the frequency domain, and each subchannel includes N consecutive PRBs. As follows Figure 6 As shown in (a).

[0055] When a slot contains PSFCH, the second to last and third to last symbols in the slot are used for PSFCH transmission, and the symbol before PSFCH is used as a GP symbol, as follows Figure 6 as shown in (b).

[0056] Unlicensed spectrum

[0057] Unlicensed spectrum is the spectrum allocated by countries and regions that can be used for radio equipment communications. This spectrum is generally considered to be a shared spectrum, that is, as long as communication equipment in different communication systems meets the regulatory requirements set by the country or region on the spectrum, they can use the spectrum without applying for exclusive spectrum authorization from the government.

[0058] Transmission structure in New Radio Unlicense (NR-U) system

[0059] Signal transmission on unlicensed spectrum (or shared spectrum) includes the following basic concepts:

[0060] Maximum Channel Occupancy Time (MCOT): refers to the maximum length of time allowed to use the unlicensed spectrum channel for signal transmission after Listen Before Talk (LBT) is successful. Different channel access priorities have different MCOTs. The current maximum value of MCOT is 10ms. It should be understood that the MCOT is the time occupied by signal transmission.

[0061] Channel Occupancy Time (COT): refers to the length of time that the signal is transmitted using the channel of the unlicensed spectrum after LBT is successful. The signal occupancy of the channel can be discontinuous during this time. Among them, the longest COT cannot exceed 20ms, and the length of time occupied by the signal transmission within the COT does not exceed MCOT.

[0062] The channel occupation time of the network device (i.e., base station) (gNB-initiated COT): also known as the COT initiated by the network device, refers to the channel occupation time obtained after the network device successfully performs LBT. In addition to being used for downlink transmission, the channel occupation time of the network device can also be used for uplink transmission by the UE under certain conditions.

[0063] UE channel occupation time (UE-initiated COT): also known as UE-initiated COT, refers to the channel occupation time obtained after UE LBT is successful.

[0064] Downlink transmission opportunity (DL burst): A group of downlink transmissions (i.e., including one or more downlink transmissions) performed by a network device, which is a continuous transmission (i.e., there is no gap between multiple downlink transmissions), or there is a gap in the group of downlink transmissions but the gap is less than or equal to 16μs. If the gap between two downlink transmissions performed by the network device is greater than 16μs, then the two downlink transmissions are considered to belong to two downlink transmission opportunities.

[0065] Uplink transmission opportunity (UL burst): A group of uplink transmissions (i.e., including one or more uplink transmissions) performed by a UE, which is a continuous transmission (i.e., there is no gap between multiple uplink transmissions), or there is a gap in the group of uplink transmissions but the gap is less than or equal to 16μs. If the gap between two uplink transmissions performed by the UE is greater than 16μs, then the two uplink transmissions are considered to belong to two uplink transmission opportunities.

[0066] After the network device initiates a COT, the resources in the COT may be used for uplink transmission by the UE.

[0067] like Figure 7 As shown in (a) in the figure, for an uplink transmission opportunity occurring within the COT of a network device, if the gap between the start position of the uplink transmission opportunity and the end position of the downlink transmission opportunity is less than 16 μs, the UE can immediately perform the uplink transmission (or Cat-1 LBT).

[0068] like Figure 7 As shown in (b), if there is no downlink transmission opportunity after the uplink transmission opportunity within the COT of the network device, the UE can perform Cat-2 LBT before transmission.

[0069] like Figure 7 As shown in (c), if the gap between any two adjacent transmissions within the COT of the network device is less than or equal to 25 μs, the UE can perform Cat-2 LBT.

[0070] Among them, Cat-1 LBT may refer to the communication device transmitting without channel detection after the gap ends (i.e., Type 2C channel access); Cat-2 LBT may refer to the communication device performing single-slot channel detection. Specifically, Cat-2 LBT may include 25 microseconds of single-slot channel detection (i.e., Type 2A channel access) and 16 microseconds of single-slot channel detection (i.e., Type 2B channel access). For an uplink transmission opportunity occurring within the COT of a network device, if the gap between the start position of the uplink transmission opportunity and the end position of the downlink transmission opportunity is 16μs, the UE may perform 16μs of Cat-2 LBT before the uplink transmission; if the gap between the start position of the uplink transmission opportunity and the end position of the downlink transmission opportunity is 25μs, the UE may perform 25μs of Cat-2 LBT before the uplink transmission. The network device may ensure the size of the gap between the start position of the uplink transmission opportunity and the end position of the downlink transmission opportunity, and notify the terminal device of the gap size information or the corresponding LBT method.

[0071] It should be understood that the way in which the network device obtains the above-mentioned channel occupancy time can be a channel access method based on load-based equipment (LoadBased Equipment, LBE), that is, the communication device can perform LBT on the unlicensed spectrum after the service arrives, and start sending service data (signal) after the LBT is successful; it can also be a channel access method based on frame structure equipment (FrameBased Equipment, FBE), that is, the communication device periodically performs LBT on the unlicensed spectrum.

[0072] In the NR-U system, in addition to supporting the channel access mechanism of LBE, the channel access mechanism of FBE is also supported. In the channel access mechanism of FBE, or in other words, in the semi-static channel access mode, the frame structure appears periodically, that is, the channel resources that the communication device can use for service transmission appear periodically. A frame structure includes at least one fixed frame period (FFP). Each FFP includes a channel occupancy time COT and an idle time (Idleduration). Among them, the length of the fixed frame period can be configured in the range of 1 to 10ms, the length of COT in the fixed frame period does not exceed 95% of the length of FFP, the length of the idle time is at least 5% of the length of FFP and the minimum value of the idle time length is 100μs, and the idle time is located at the end of the fixed frame period.

[0073] The communication device performs LBT on the channel based on a fixed-length listening time slot during idle time. If LBT succeeds, the COT in the next fixed frame period can be used to transmit signals; if LBT fails, the COT in the next fixed frame period cannot be used to transmit signals.

[0074] The semi-static channel access mode can be configured by the base station through system information or through high-level parameters. If a serving cell is configured as the semi-static channel access mode by the base station, the length of the fixed frame period (FFP) of the serving cell is T x The maximum COT length included in the fixed frame period of the serving cell is T y , the length of the idle time included in the FFP of the serving cell is T z The base station can configure the fixed frame period length T x 1ms, 2ms, 2.5ms, 4ms, 5ms, or 10ms. The UE can x Length determination T y and T z Specifically, starting from the even-numbered radio frames, within every two consecutive radio frames, the UE can x Determine the starting position of each FFP, where x∈{0,1,…,20 / Tx-1}, the maximum COT length within FFP is T y =0.95·T x , the idle time length in FFP is at least T z =max(0.05·T x , 100μs).

[0075] like Figure 8 As shown in the figure, assuming that the cycle length of FFP is 4ms, after receiving the FFP length Tx=4ms configured by the base station, the UE can x-1} determines x∈{0,1,2,3,4}, and then the UE can determine the starting position of each FFP in every two consecutive radio frames as 0ms, 4ms, 8ms, 12ms, and 16ms. In each FFP, the maximum COT length is T y =3.8ms, the idle time length is T z =0.2ms.

[0076] Channel access type (or LBT method) in NR-U system

[0077] Type 1 channel access: multi-slot channel detection with random backoff based on contention window size adjustment. According to the channel access priority p, a channel with a length of T can be initiated. mcot Channel occupancy, the base station uses the type1 LBT method. In addition to sending its own data, it can also share COT with the UE. The UE uses the type1 LBT method. In addition to sending its own data, it can also share COT with the base station. The following table shows the channel access priority and its corresponding channel access parameters when the terminal performs Type1 channel access.

[0078] Table 1 Channel access parameters corresponding to different channel priorities

[0079]

[0080] It should be noted that in the above Table 1, m p It refers to the number of backoff slots corresponding to the channel access priority p, CW p It refers to the contention window size corresponding to the channel access priority p, CW min,p Refers to the CW corresponding to the channel access priority p p The minimum value, CW max,p Refers to the CW corresponding to the channel access priority p p The maximum value, T mcot,p It refers to the maximum channel occupancy time length corresponding to the channel access priority p. Among the four channel access priorities in Table 1, p=1 is the highest priority.

[0081] When the base station initiates COT, in addition to using the resources in the COT for downlink transmission, the resources in the COT can also be shared with the UE for uplink transmission. When the resources in the COT are shared with the UE for uplink transmission, the channel access mode that the UE can use is Type 2A channel access, Type 2B channel access or Type 2C channel access, among which Type 2A channel access, Type 2B channel access and Type 2C channel access are all channel access modes based on fixed-length monitoring time slots.

[0082] Type 2A channel access (Cat-2 LBT, 25μs): The UE's channel detection method is 25μs single-slot channel detection. Specifically, under Type 2A channel access, the UE can perform 25μs channel monitoring before starting transmission, and transmit after the channel monitoring is successful.

[0083] Type 2B channel access (Cat-2 LBT, 16μs): The UE's channel detection method is 16μs single-slot channel detection. Specifically, under Type 2B channel access, the UE can perform 16μs channel monitoring before the start of transmission, and transmit after the channel monitoring is successful. Among them, the gap between the start position of the transmission and the end position of the previous transmission is 16μs.

[0084] Type 2C channel access (Cat-1 LBT): The UE transmits without performing channel detection after the gap ends. Specifically, under Type 2C channel access, the UE can directly transmit, where the gap between the start position of the transmission and the end position of the previous transmission is less than or equal to 16μs. The length of the transmission does not exceed 584μs.

[0085] Fig. 9 A flowchart of a sideline communication method provided by an exemplary embodiment of the present application is shown. The method is executed by a first terminal, the first terminal is a terminal that supports sideline transmission, and the first terminal is a terminal that uses unlicensed spectrum for sideline communication. The method includes:

[0086] Step 902: When the transmission condition is met, the first terminal performs side transmission in the first time domain unit.

[0087] The transmission conditions include the following:

[0088] Condition 1: The first terminal has authorized transmission resources in the first time domain unit;

[0089] Condition 2: The channel access performed by the first terminal before the first time domain unit is successful.

[0090] The first time domain unit is at least one of a radio frame, a subframe, a time slot, a sub-time slot, a symbol group, and a symbol. In this embodiment, the first time domain unit is a time slot as an example for illustration.

[0091] For condition 1:

[0092] The authorized transmission resource may be a transmission resource allocated by the network device or the network side to the first terminal. For example, when the first terminal operates in the first mode of sidelink communication (i.e., the sidelink transmission resource is allocated by the network side), the authorized transmission resource is the sidelink transmission resource allocated to the first terminal by the network side in a dynamic allocation manner; or, the authorized transmission resource is the sidelink transmission resource allocated to the first terminal by the network side in a SideLink Configured Grant manner.

[0093] The authorized transmission resource may also be a transmission resource selected autonomously by the first terminal. For example, when the first terminal operates in the second mode of sideline communication (i.e., the terminal autonomously selects the sideline transmission resource), the authorized transmission resource is a transmission resource selected or reserved by the first terminal based on sensing.

[0094] The authorized transmission resources may also be transmission resources allocated by the second terminal to the first terminal. For example, the second terminal is a group head terminal, and the second terminal allocates the transmission resources within the initiated COT to the first terminal.

[0095] For condition 2:

[0096] The type of channel access performed by the first terminal before the first time domain unit includes at least one of the following types: type 1 channel access, type 2A channel access, type 2B channel access, and type 2C channel access. Among them, when the first terminal adopts type 2C channel access, the first terminal does not need to monitor whether the channel is idle and can directly enter the side transmission. At the same time, the duration of the side transmission of the first terminal does not exceed the first duration. For example, the first duration is 584 microseconds (us).

[0097] The first terminal successfully accesses the channel before the first time domain unit, including: the first terminal successfully accesses the channel immediately before the first time domain unit, such as Fig.10 as shown; or Fig.11 As shown. Fig.10 In the first time domain unit, all or part of the time domain units are used for side transmission; Fig.11 In the example, the first time domain unit is the time domain unit corresponding to this side transmission.

[0098] In some embodiments, when the first time domain unit is within the channel occupation time initiated by the third terminal, the first terminal performs type 2A or type 2B channel access before the first time domain unit. When the first time domain unit is not within the channel occupation time initiated by the third terminal, the first terminal performs type 1 channel access before the first time domain unit.

[0099] The first terminal performing sidelink transmission in the first time domain unit includes: the first terminal sending sidelink data (sending PSCCH / PSSCH) in the first time domain unit, or the first terminal sending sidelink feedback information (sending PSFCH) in the first time domain unit.

[0100] To summarize, the method provided in this embodiment enables the first terminal to conditionally use the unlicensed spectrum for side communication by performing side transmission on the first time domain unit when the first terminal has authorized transmission resources and the channel access performed before the first time domain unit is successful, thereby realizing side communication based on the unlicensed spectrum.

[0101] Based on Fig. 9 In an embodiment of the present invention, if the first terminal uses a semi-static channel access mode, when the channel access mode parameter is configured as semi-static, in addition to condition 1 and condition 2, the transmission condition also includes at least one of the following conditions:

[0102] Condition 3: The end time of the side transmission is before the start time of the idle time in the current cycle;

[0103] Condition 4: The ratio between the number of first symbols and the number of second symbols is greater than or equal to the first threshold value;

[0104] Condition 5: The number of first symbols is greater than the second threshold value.

[0105] The first symbol number is the number of symbols corresponding to the duration between the start time of the side transmission and the start time of the idle time in the current cycle, and the second symbol number is the number of symbols occupied by the side transmission. Optionally, the end time of the side transmission is after the start time of the idle time in the current cycle.

[0106] In one embodiment, the first number of symbols is the number of symbols corresponding to the duration between the start time of the side transmission and the start time of the idle time in the current cycle. For example, the start time of the side transmission is recorded as T 1 , the starting time of the idle time in the current cycle is recorded as T 2 , the duration of an OFDM symbol is recorded as T symb , the number of the first symbol is recorded as M, then:

[0107]

[0108] or,

[0109]

[0110] in, Indicates rounding up. Indicates rounding down.

[0111] Optionally, the symbol corresponding to the sideline transmission of the first terminal does not include a GP symbol after the sideline transmission.

[0112] Optionally, the first threshold value or the second threshold value is preconfigured or configured by the network device. For example, the sideline BWP includes a parameter for configuring at least one of the first threshold value and the second threshold value. For another example, the resource pool configuration information includes a parameter for configuring at least one of the first threshold value and the second threshold value.

[0113] In one embodiment, the channel access mode parameter is a high-level parameter "ChannelAccessMode". When the high-level parameter "ChannelAccessMode" is configured as "semiStatic", it indicates that a channel access method based on FBE is used. Figure 8 In the example shown, within each FFP, the maximum COT length is T y =3.8ms, the length of the idle time is T z =0.2ms. If the subcarrier spacing used by the side transmission system is 15kHz, a time length of 1ms corresponds to a time slot, and a 4ms period includes 4 time slots. Since the first three time slots in each FFP are complete time slots and are all located in the COT, the terminal can use these three time slots for side transmission, but part of the symbols in the fourth time slot are located in the COT, and the other part of the symbols are located in the idle time. Since the idle time is 0.2ms, the corresponding time length is less than the time length corresponding to 3 symbols (the duration of a symbol is about 71us, including the length of the CP), that is, symbols #0 to #10 in the fourth time slot are located before the start time of the idle time, and symbols #11 to #13 overlap with the idle time. Therefore, whether the terminal can use this time slot for side transmission can be determined in the following way.

[0114] For condition 3:

[0115] In the semi-static channel access mode, the time domain is divided into multiple FFPs. The current cycle refers to the FFP where the first time domain unit is located. The current cycle (or a single cycle or each cycle) includes: channel occupation time and idle time. Among them, the channel occupation time is in the first half of the current cycle, and the idle time is in the second half of the current cycle.

[0116] If the end time of the side transmission is before the start time of the idle time in the current cycle, the first terminal allows side transmission in the first time domain unit; if the end time of the side transmission is after the start time of the idle time in the current cycle, the first terminal does not allow or prohibits side transmission in the first time domain unit.

[0117] Taking the first time domain unit as a time slot as an example, the first time domain unit corresponds to the last time slot in the current FFP cycle. Assume that PSFCH resources are configured in the time slot, such as Figure 6 As described in (b), PSFCH occupies the 12th and 13th symbols in the time slot (corresponding to symbol indexes #11 and #12, respectively), and the 11th and 14th symbols are GPs that do not transmit data. Therefore, the PSSCH in the time slot occupies the 1st to 10th symbols. If the first terminal performs side transmission (sending PSCCH / PSSCH) in the time slot, since the end time of the side transmission (corresponding to symbol index #9) is before the start time of the idle time, the first terminal is allowed to perform side transmission in the time slot. For another example, if PSFCH resources are not configured in the time slot, all symbols are symbols used for PSSCH transmission. If the first terminal wants to perform side transmission (sending PSCCH / PSSCH) in the time slot, since the end time of the side transmission is after the start time of the idle time, the first terminal cannot perform side transmission in the time slot.

[0118] For condition 4:

[0119] If the ratio between the first number of symbols and the second number of symbols is greater than or equal to the first threshold value, the first terminal allows side transmission in the first time domain unit; if the ratio between the first number of symbols and the second number of symbols is less than the first threshold value, the first terminal does not allow or prohibits side transmission in the first time domain unit. The end time of the side transmission is after the start time of the idle time in the current cycle.

[0120] The first threshold value is predefined or preconfigured or configured by the network device.

[0121] In one example, the first threshold value is configured as 0.7 in the configuration parameters of the resource pool. Taking the first time domain unit as a time slot as an example, the first time domain unit corresponds to the last time slot in the current FFP cycle, such as Fig.12As shown, no PSFCH resources are configured in the time slot, and all symbols are used for PSSCH transmission. If the first terminal wants to perform side transmission (send PSCCH / PSSCH) in the time slot, since the number of first symbols is 11 symbols (taking Formula 2 as an example), and the number of second symbols is 13 symbols (excluding the last GP symbol), the ratio between the first number of symbols and the second number of symbols (11 / 13≈0.84) is greater than the first threshold value of 0.7, the first terminal is allowed to perform side transmission in the time slot.

[0122] For condition 5:

[0123] If the number of first symbols is greater than or equal to the second threshold value, the first terminal allows side transmission in the first time domain unit; if the number of first symbols is less than the second threshold value, the first terminal does not allow or prohibits side transmission in the first time domain unit. The end time of the side transmission is after the start time of the idle time in the current cycle.

[0124] The second threshold value is predefined or preconfigured or configured by the network device.

[0125] In an example, the second threshold value configured in the resource pool configuration parameter is 10. Taking the first time domain unit as a time slot as an example, the first time domain unit corresponds to the last time slot in the current FFP cycle, such as Fig.12 As shown, no PSFCH resources are configured in the time slot, and all symbols are used for PSSCH transmission. If the first terminal wants to perform side transmission (send PSCCH / PSSCH) in the time slot, since the number of first symbols (i.e., 11 symbols) is greater than the second threshold value, the first terminal is allowed to perform side transmission in the time slot.

[0126] To sum up, the method provided in this embodiment can avoid the impact of idle time on the first terminal by adding conditions 3 / 4 / 5 as transmission conditions for the first terminal to perform side transmission on the unlicensed spectrum in the semi-static channel access mode.

[0127] For condition 3, if the end time of the side transmission is before the start time of the idle time, the idle time will not affect the current side transmission, so the terminal can perform the current side transmission, thereby ensuring that the idle time does not affect the current side transmission.

[0128] For condition 4 or condition 5, although the end time of the side transmission is after the start time of the idle time, the side transmission uses more symbols. Even if the side data is not transmitted on the symbols corresponding to the idle time, the third terminal as the receiving end can also correctly receive the side data. That is, the idle time has little impact on this side transmission, and normal side transmission is still possible. In this case, the side transmission will continue to ensure a smaller transmission delay and improve transmission efficiency.

[0129] Based on Fig. 9 In the embodiment of the present invention, the first time domain unit is located in the COT initiated by the third terminal, and in addition to condition 1 and condition 2, the transmission condition further includes the following conditions:

[0130] Condition 6: The third terminal is a target receiving terminal of the sidelink data to be sent by the first terminal.

[0131] In the case where the first time domain unit is located in the COT initiated by the third terminal, if the third terminal is the target receiving terminal of the side data to be sent by the first terminal, the first terminal allows side transmission in the first time domain unit; if the third terminal is not the target receiving terminal of the side data to be sent by the first terminal, the first terminal does not allow or prohibits side transmission in the first time domain unit.

[0132] After initiating COT, the third terminal will send COT indication information, which is used to indicate the information of the COT occupied by the third terminal. The first terminal can know whether the COT is initiated by the third terminal based on the COT indication information, or the first terminal can determine which terminal initiated the COT based on the COT indication information.

[0133] When the first terminal uses Type 2A or Type 2B to access the channel in the COT initiated by the third terminal, the sideline data to be transmitted by the first terminal needs to be sent to the third terminal. Alternatively, when the first terminal is in the COT initiated by the third terminal, and the sideline data to be transmitted by the first terminal is sent to the third terminal, the first terminal can use Type 2A or Type 2B to access the channel; otherwise, the first terminal uses Type 1 channel access.

[0134] Sidelink transmission supports communication modes such as unicast, multicast and broadcast.

[0135] Unicast: The target receiving end is only one third terminal, and the destination ID in the sidelink control information (SideLinkControl Information, SCI) sent by the first terminal is determined according to the identification information of the receiving end.

[0136] Multicast: The sidelink data sent by the sending end is targeted at a group of third terminals. The destination ID in the SCI sent by the first terminal is determined according to the group ID or service type.

[0137] Broadcast: The target receiving end of the sideline data sent by the transmitting end is all third terminals that are interested in the service type of the sideline data. The destination ID in the SCI sent by the first terminal is determined according to the service type.

[0138] If the first terminal uses unicast mode for side transmission, the target identifier of the SCI sent in the side transmission is determined based on the identification information of the third terminal. That is, if the side transmission of the first terminal on the first time domain unit is performed in unicast mode, the target identifier in the SCI sent by the first terminal is determined based on the identification information of the third terminal. For example, the SCI includes 16 bits of target identification information, and the 16 bits of target identification information are determined based on the last 16 bits of the identification information (24 bits) of the third terminal.

[0139] If the first terminal uses multicast to perform side transmission, the target identifier of the SCI sent in the side transmission is determined based on the group identification information or the service type, the group identification information is used to indicate the communication group including the first terminal and the third terminal, and the service corresponding to the service type is the service that the third terminal needs to receive. That is, if the side transmission of the first terminal on the first time domain unit is performed in a multicast transmission mode, the target identifier in the SCI sent by the first terminal is determined according to the group identification information or the service type. Among them, the communication group corresponding to the group identification information includes the first terminal and the third terminal.

[0140] Optionally, the first terminal obtains indication information from the third terminal, and determines the target identification information according to the indication information; the indication information may be carried by SCI or PC5-RRC signaling. For example, when the first terminal and the third terminal perform unicast communication, the third terminal indicates to the first terminal through PC5-RRC the service type that the third terminal is interested in or needs to receive; or the third terminal sends SCI to the first terminal, and the SCI is used to indicate the service type corresponding to the sidelink data sent by the third terminal. Usually, the service type is also the service type that the third terminal needs to receive or the service type that is interested in.

[0141] For example, the first terminal receives the SCI sent by the third terminal, and the target identification information included in the SCI includes group identification information. The side data to be sent by the first terminal in the first time slot is also sent to the communication group corresponding to the group identification information, that is, the third terminal is also a member of the communication group. Then, the first terminal can perform side transmission in the first time slot. Furthermore, the first terminal carries the group identification information in the SCI.

[0142] For another example, a first terminal receives an SCI sent by a third terminal. The SCI includes target identification information, and the target identification information corresponds to a first service type. The side data to be sent by the first terminal in the first time slot also corresponds to the first service type, that is, the third terminal will also receive data of this service type. The first terminal can perform side transmission in the first time slot. Furthermore, the first terminal carries the target identification information corresponding to the first service type in the SCI.

[0143] If the first terminal performs sideline transmission in a broadcasting manner, the target identifier of the SCI sent in the sideline transmission is determined based on the service type, and the service corresponding to the service type is the service that the third terminal needs to receive. That is, if the sideline transmission of the first terminal in the first time slot is performed in a broadcasting transmission manner, the target identifier in the SCI sent by the first terminal is determined according to the service type.

[0144] To sum up, the method provided in this embodiment, by, when the first time domain unit is located within the COT initiated by the third terminal, the first terminal performs side transmission when it determines that the third terminal is the target receiving terminal of the side data to be sent, thereby avoiding the first terminal sending side data irrelevant to the third terminal, thereby additionally occupying the COT initiated by the third terminal and causing unreasonable unauthorized spectrum occupation for the third terminal.

[0145] It should be noted that all or part of the above conditions 1 to 6 can also be combined into a new embodiment, such as conditions 1 to 6 are combined into a new embodiment. For another example, conditions 1, condition 2, condition 3, and condition 6 are combined into a new embodiment. For another example, conditions 1, condition 2, condition 4, and condition 6 are combined into a new embodiment. For another example, conditions 1, condition 2, condition 5, and condition 6 are combined into a new embodiment. This is the content that can be obtained without doubt by those skilled in the art based on the above records, and this application will not repeat it.

[0146] Fig.13 A block diagram of a side communication device provided by an exemplary embodiment of the present application is shown. The device includes:

[0147] A side transmission module 1320 (or a transmission module), configured to perform side transmission on a first time domain unit when a transmission condition is met;

[0148] The transmission condition includes: the device has authorized transmission resources in the first time domain unit, and the channel access performed by the device before the first time domain unit is successful.

[0149] In a possible design of this embodiment, the authorized transmission resource includes at least one of the following:

[0150] The transmission resources allocated by the network equipment to the device; for example, when the device operates in the first mode of sidelink communication (i.e., the sidelink transmission resources are allocated by the network side), the authorized transmission resources are the sidelink transmission resources allocated to the device by the network side in a dynamic allocation manner; or, the authorized transmission resources are the sidelink transmission resources allocated to the device by the network side in a SideLink Configured Grant manner.

[0151] The transmission resource autonomously selected by the device. For example, when the device operates in the second mode of sideline communication (i.e., the sideline transmission resource is autonomously selected by the terminal), the authorized transmission resource is a transmission resource selected or reserved by the first terminal based on sensing.

[0152] The second terminal allocates the transmission resources to the device. For example, the second terminal is a group head terminal, and the second terminal allocates the transmission resources within the initiated COT to the device.

[0153] In a possible design of this embodiment, the type of channel access includes at least one of the following types:

[0154] Type 1 channel access, Type 2A channel access, Type 2B channel access, Type 2C channel access.

[0155] In a possible design of this embodiment, the device further includes:

[0156] The listening module 1340 (or receiving module) is also used to perform type 2A or type 2B channel access before the first time domain unit when the first time domain unit is located within the channel occupation time initiated by the third terminal; and to perform type 1 channel access before the first time domain unit when the first time domain unit is not located within the channel occupation time initiated by the third terminal.

[0157] In a possible design of this embodiment, the side transmission module 1320 is used to ensure that the duration of the side transmission on the first time domain unit does not exceed a first duration when the channel access type is type 2C.

[0158] In a possible design of this embodiment, the successful channel access includes: successful channel access immediately before the first time domain unit; or successful channel access immediately before the side transmission in the first time domain unit.

[0159] In a possible design of this embodiment, when the channel access mode parameter is configured as semi-static, the transmission condition further includes:

[0160] The end time of the side transmission is before the start time of the idle time in the current cycle;

[0161] Or, a ratio between the first number of symbols and the second number of symbols is greater than or equal to a first threshold value, the first number of symbols is the number of symbols corresponding to the duration between the start time of the side transmission and the start time of the idle time in the current cycle, and the second number of symbols is the number of symbols occupied by the side transmission;

[0162] Or, the number of the first symbols is greater than a second threshold value;

[0163] The current period is the period in which the first time domain unit is located.

[0164] For example, the start time of the side transmission is recorded as T 1 , the starting time of the idle time in the current cycle is recorded as T 2 , the duration of an OFDM symbol is recorded as T symb , the number of the first symbol is recorded as M, then:

[0165]

[0166] or,

[0167]

[0168] in, Indicates rounding up. Indicates rounding down.

[0169] In a possible design of this embodiment, the second number of symbols does not include the interval symbol after the sideline transmission.

[0170] In a possible design of this embodiment, the first threshold value is predefined, preconfigured, or configured by a network device.

[0171] In a possible design of this embodiment, the second threshold value is predefined, preconfigured, or configured by a network device.

[0172] In a possible design of this embodiment, when the first time domain unit is within the channel occupation time initiated by the third terminal, the transmission condition further includes:

[0173] The third terminal is a target receiving terminal of the sidelink data to be sent by the apparatus.

[0174] In a possible design of this embodiment, when the transmission condition is met:

[0175] If the device performs the side transmission in unicast mode, the target identifier of the SCI sent in the side transmission is determined based on the identifier information of the third terminal;

[0176] or, if the device adopts a multicast mode to perform the side transmission, the target identifier of the SCI sent in the side transmission is determined based on group identification information or a service type, the group identification information is used to indicate a communication group including the device and the third terminal, and the service corresponding to the service type is a service that the third terminal needs to receive;

[0177] Alternatively, if the device performs the side transmission in a broadcasting manner, the target identifier of the SCI sent in the side transmission is determined based on a service type, and the service corresponding to the service type is the service that the third terminal needs to receive.

[0178] Fig.14 A schematic diagram of the structure of a UE provided by an exemplary embodiment of the present application is shown. The UE includes: a processor 1401, a receiver 1402, a transmitter 1403, a memory 1404 and a bus 1405.

[0179] The processor 1401 includes one or more processing cores. The processor 1401 executes various functional applications and information processing by running software programs and modules.

[0180] The receiver 1402 and the transmitter 1403 may be implemented as a communication component, which may be a communication chip. The communication component is used to implement side transmission.

[0181] The memory 1404 is connected to the processor 1401 via a bus 1405 .

[0182] The memory 1404 may be used to store at least one instruction, and the processor 1401 may be used to execute the at least one instruction to implement each step in the above method embodiment.

[0183] In addition, the memory 1404 can be implemented by any type of volatile or non-volatile storage device or a combination thereof. The volatile or non-volatile storage device includes but is not limited to: a magnetic disk or an optical disk, an electrically erasable programmable read-only memory (EEPROM), an erasable programmable read-only memory (EPROM), a static random-access memory (SRAM), a read-only memory (ROM), a magnetic memory, a flash memory, and a programmable read-only memory (PROM).

[0184] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory including instructions, and the instructions can be executed by a processor of a UE to complete the above-mentioned side transmission method. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a compact disc read-only memory (CD-ROM), a magnetic tape, a floppy disk, an optical data storage device, etc.

[0185] A non-transitory computer-readable storage medium, when the instructions in the non-transitory computer storage medium are executed by a processor of a UE, enables the UE to perform the above-mentioned sidelink transmission method.

[0186] An exemplary embodiment of the present application also provides a computer-readable storage medium, in which at least one instruction, at least one program, a code set or an instruction set is stored. The at least one instruction, the at least one program, the code set or the instruction set is loaded and executed by the processor to implement the side transmission method provided by the above-mentioned various method embodiments.

[0187] An exemplary embodiment of the present application also provides a computer program product, which includes computer instructions, and the computer instructions are stored in a computer-readable storage medium; a processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the side transmission method provided in the above-mentioned various method embodiments.

[0188] It should be understood that the "plurality" mentioned in this article 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 can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0189] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0190] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A side communication method, characterized in that: The method is performed by a first terminal, where the first terminal uses an unlicensed spectrum for sideline communication, and the method includes: When the transmission condition is met, the first terminal performs side transmission on the first time domain unit; The transmission condition includes: the first terminal has authorized transmission resources in the first time domain unit, and the channel access performed by the first terminal before the first time domain unit is successful.

2. The method according to claim 1, characterized in that The authorized transmission resource includes at least one of the following: a transmission resource allocated by the network device to the first terminal; The transmission resource autonomously selected by the first terminal; The second terminal allocates transmission resources to the first terminal.

3. The method according to claim 1, characterized in that The channel access type includes at least one of the following types: Type 1 channel access, Type 2A channel access, Type 2B channel access, Type 2C channel access.

4. The method according to claim 3, characterized in that The method further comprises: In a case where the first time domain unit is within a channel occupation time initiated by a third terminal, the first terminal performs type 2A or type 2B channel access before the first time domain unit; In a case where the first time domain unit is not located within the channel occupation time initiated by the third terminal, the first terminal performs type 1 channel access before the first time domain unit.

5. The method according to claim 1, characterized in that The method further comprises: When the channel access type is type 2C, the duration of the sidelink transmission performed by the first terminal in the first time domain unit does not exceed the first duration.

6. The method according to claim 1, characterized in that The channel access success includes: Access to the channel immediately before the first time domain unit is successful; or, The channel access immediately before the sideline transmission in the first time domain unit is successful.

7. The method according to any one of claims 1 to 6, characterized in that: When the channel access mode parameter is configured as semi-static, the transmission condition further includes: The end time of the side transmission is before the start time of the idle time in the current cycle; Or, a ratio between the first number of symbols and the second number of symbols is greater than or equal to a first threshold value, the first number of symbols is the number of symbols corresponding to the duration between the start time of the side transmission and the start time of the idle time in the current cycle, and the second number of symbols is the number of symbols occupied by the side transmission; Or, the number of the first symbols is greater than a second threshold value; The current period is the period in which the first time domain unit is located.

8. The method according to claim 7, characterized in that The second number of symbols does not include an interval symbol after the sideline transmission.

9. The method according to claim 7, characterized in that: The first threshold value is predefined, preconfigured, or configured by a network device.

10. The method according to claim 7, characterized in that The second threshold value is predefined, preconfigured, or configured by a network device.

11. The method according to any one of claims 1 to 10, characterized in that: In a case where the first time domain unit is located within a channel occupation time initiated by a third terminal, the transmission condition further includes: The third terminal is a target receiving terminal of the sidelink data to be sent by the first terminal.

12. The method according to claim 11, characterized in that When the transmission conditions are met: If the first terminal performs the side transmission in unicast mode, the target identifier of the SCI sent in the side transmission is determined based on the identifier information of the third terminal; or, If the first terminal performs the side transmission in a multicast manner, the target identifier of the SCI sent in the side transmission is determined based on group identifier information or a service type, the group identifier information is used to indicate a communication group including the first terminal and the third terminal, and the service corresponding to the service type is a service that the third terminal needs to receive; or, If the first terminal performs the side transmission in a broadcasting manner, the target identifier of the SCI sent in the side transmission is determined based on a service type, and the service corresponding to the service type is the service that the third terminal needs to receive.

13. A side communication device, characterized in that: The device comprises: A side transmission module, configured to perform side transmission on the first time domain unit when a transmission condition is met; The transmission condition includes: the device has authorized transmission resources in the first time domain unit, and the channel access performed by the device before the first time domain unit is successful.

14. The device according to claim 13, characterized in that The authorized transmission resource includes at least one of the following: a transmission resource allocated by a network device to the apparatus; transmission resources autonomously selected by the device; The second terminal allocates transmission resources to the first terminal.

15. The device according to claim 13, characterized in that The channel access type includes at least one of the following types: Type 1 channel access, Type 2A channel access, Type 2B channel access, Type 2C channel access.

16. The device according to claim 15, characterized in that The device also includes: The listening module is also used to perform type 2A or type 2B channel access before the first time domain unit when the first time domain unit is located within the channel occupation time initiated by the third terminal; and to perform type 1 channel access before the first time domain unit when the first time domain unit is not located within the channel occupation time initiated by the third terminal.

17. The device according to claim 13, characterized in that The side transmission module is used to ensure that the duration of side transmission on the first time domain unit does not exceed a first duration when the channel access type is type 2C.

18. The device according to claim 13, characterized in that The channel access success includes: Access to the channel immediately before the first time domain unit is successful; or, The channel access immediately before the sideline transmission in the first time domain unit is successful.

19. The device according to any one of claims 13 to 18, characterized in that When the channel access mode parameter is configured as semi-static, the transmission condition further includes: The end time of the side transmission is before the start time of the idle time in the current cycle; Or, a ratio between the first number of symbols and the second number of symbols is greater than or equal to a first threshold value, the first number of symbols is the number of symbols corresponding to the duration between the start time of the side transmission and the start time of the idle time in the current cycle, and the second number of symbols is the number of symbols occupied by the side transmission; Or, the number of the first symbols is greater than a second threshold value; The current period is the period in which the first time domain unit is located.

20. The device according to claim 19, characterized in that The second number of symbols does not include an interval symbol after the sideline transmission.

21. The device according to claim 19, characterized in that The first threshold value is predefined, preconfigured, or configured by a network device.

22. The device according to claim 19, characterized in that The second threshold value is predefined, preconfigured, or configured by a network device.

23. The device according to any one of claims 13 to 22, characterized in that In a case where the first time domain unit is located within a channel occupation time initiated by a third terminal, the transmission condition further includes: The third terminal is a target receiving terminal of the sidelink data to be sent by the apparatus.

24. The device according to claim 23, characterized in that When the transmission conditions are met: If the device performs the side transmission in unicast mode, the target identifier of the SCI sent in the side transmission is determined based on the identifier information of the third terminal; or, If the device adopts a multicast mode to perform the side transmission, the target identifier of the SCI sent in the side transmission is determined based on group identification information or a service type, the group identification information is used to indicate a communication group including the device and the third terminal, and the service corresponding to the service type is a service that the third terminal needs to receive; or, If the device performs the side transmission in a broadcasting manner, the target identifier of the SCI sent in the side transmission is determined based on a service type, and the service corresponding to the service type is the service that the third terminal needs to receive.

25. A terminal, characterized in that: The terminal comprises: processor; a transceiver connected to the processor; The processor is configured to load and execute executable instructions to implement the side transmission method as described in any one of claims 1 to 12.

26. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores at least one program, and the at least one program is loaded and executed by a processor to implement the side transmission method as described in any one of claims 1 to 12.

27. A computer program product, characterized in that The computer program product includes computer instructions, which are stored in a computer-readable storage medium; a processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the side transmission method as described in any one of claims 1 to 12.

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