Communication method and communication device

Abstract

Provided are a communication method and a communication device, the method comprising: a first terminal device receiving a first physical sidelink control channel (PSCCH) in a first time slot, the first PSCCH being used for scheduling a first physical sidelink shared channel (PSSCH); the first terminal device receives the first PSSCH in a second time slot according to the first PSCCH; wherein the interval between the first time slot and the second time slot is greater than or equal to X time slots, and X is a positive integer. The method provided by the embodiment of the invention is beneficial to reducing the power consumption of the terminal equipment in sidewalk communication.

Description

Communication method and communication device Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a communication method and a communication device. Background Art

[0002] With the continuous development of communication technology, sidelink (SL) communication is becoming more and more widely used, and the power consumption of terminal devices during sidelink communication has also received increasing attention. However, how to reduce the power consumption of terminal devices during sidelink communication has become a technical problem that needs to be solved urgently.

[0003] Summary of the Invention

[0004] The embodiments of the present application provide a communication method and a communication device. The following describes various aspects of the embodiments of the present application.

[0005] In a first aspect, a communication method is provided, including: a first terminal device receives a first physical sideline control channel PSCCH in a first time slot, the first PSCCH being used to schedule a first physical sideline shared channel PSSCH; the first terminal device receives the first PSSCH in a second time slot according to the first PSCCH; wherein an interval between the first time slot and the second time slot is greater than or equal to X time slots, and X is a positive integer.

[0006] In a second aspect, a communication method is provided, including: a second terminal device sends a first physical sideline control channel PSCCH in a first time slot, and the first PSCCH is used to schedule a first physical sideline shared channel PSSCH; the second terminal device sends the first PSSCH in a second time slot; wherein the interval between the first time slot and the second time slot is greater than or equal to X time slots, and X is a positive integer.

[0007] According to a third aspect, a communication method is provided, including: a first terminal device detecting first sideline control information SCI in a first time slot; and the first terminal device determining whether to detect second SCI in the first time slot based on the first SCI.

[0008] In a fourth aspect, a communication method is provided, including: a second terminal device sends first sideline control information SCI in a first time slot; and the second terminal device determines whether to send a second SCI in the first time slot based on the first SCI.

[0009] In a fifth aspect, a communication method is provided, including: a first terminal device receives a first physical sidelink shared channel PSSCH according to first information, and the first PSSCH corresponds to a first demodulation reference signal DMRS; the first terminal device decodes the first PSSCH according to the first DMRS; wherein the first information includes one or more of the following: the first DMRS, the time-frequency position of the first DMRS, the sidelink configuration authorization information, the size of the frequency domain resources occupied by the first PSSCH, the modulation and coding strategy MCS adopted by the first PSSCH, the sequence corresponding to the first demodulation reference signal DMRS, the time-frequency position of the first DMRS, the code rate adopted by the second-order sidelink control information SCI corresponding to the first PSSCH, and the size of the transmission block TB sent by the first PSSCH.

[0010] In the sixth aspect, a communication method is provided, including: a second terminal device sends a first physical sidelink shared channel PSSCH according to the first information, and the first PSSCH corresponds to a first demodulation reference signal DMRS; wherein the first information includes one or more of the following: the first DMRS, the time-frequency position of the first DMRS, the sidelink configuration authorization information, the size of the frequency domain resources occupied by the first PSSCH, the modulation and coding strategy MCS adopted by the first PSSCH, the sequence corresponding to the first demodulation reference signal DMRS, the time-frequency position of the first DMRS, the code rate adopted by the second-order sidelink control information SCI corresponding to the first PSSCH, and the size of the transmission block TB sent by the first PSSCH.

[0011] In the seventh aspect, a communication device is provided, including: a receiving unit, configured to receive a first physical sideline control channel PSCCH in a first time slot, wherein the first PSCCH is used to schedule a first physical sideline shared channel PSSCH; the receiving unit, configured to receive the first PSSCH in a second time slot according to the first PSCCH; wherein the interval between the first time slot and the second time slot is greater than or equal to X time slots, and X is a positive integer.

[0012] In an eighth aspect, a communication device is provided, including: a sending unit, configured to send a first physical sideline control channel PSCCH in a first time slot, wherein the first PSCCH is used to schedule a first physical sideline shared channel PSSCH; the sending unit, configured to send the first PSSCH in a second time slot; wherein the interval between the first time slot and the second time slot is greater than or equal to X time slots, and X is a positive integer.

[0013] In a ninth aspect, a communication device is provided, comprising: a detection unit for detecting first sideline control information SCI in a first time slot; and a determination unit for determining whether to detect second SCI in the first time slot based on the first SCI.

[0014] In a tenth aspect, a communication device is provided, comprising: a sending unit for sending first side control information SCI in a first time slot; and a determining unit for determining whether to send second SCI in the first time slot based on the first SCI.

[0015] In the eleventh aspect, a communication device is provided, including: a receiving unit, used to receive a first physical sidelink shared channel PSSCH according to first information, the first PSSCH corresponding to a first demodulation reference signal DMRS; a decoding unit, used to decode the first PSSCH according to the first DMRS; wherein the first information includes one or more of the following: the first DMRS, the time-frequency position of the first DMRS, the sidelink configuration authorization information, the size of the frequency domain resources occupied by the first PSSCH, the modulation and coding strategy MCS adopted by the first PSSCH, the sequence corresponding to the first demodulation reference signal DMRS, the time-frequency position of the first DMRS, the code rate adopted by the second-order sidelink control information SCI corresponding to the first PSSCH, and the size of the transmission block TB sent by the first PSSCH.

[0016] In the twelfth aspect, a communication device is provided, including: a sending unit, used to send a first physical sidelink shared channel PSSCH according to first information, the first PSSCH corresponding to a first demodulation reference signal DMRS; wherein the first information includes one or more of the following: the first DMRS, the time-frequency position of the first DMRS, the sidelink configuration authorization information, the size of the frequency domain resources occupied by the first PSSCH, the modulation and coding strategy MCS adopted by the first PSSCH, the sequence corresponding to the first demodulation reference signal DMRS, the time-frequency position of the first DMRS, the code rate adopted by the second-order sidelink control information SCI corresponding to the first PSSCH, and the size of the transmission block TB sent by the first PSSCH.

[0017] In the thirteenth aspect, a communication device is provided, comprising a memory, a transceiver and a processor, wherein the memory is used to store programs, the processor sends and receives data through the transceiver, and the processor is used to call the program in the memory so that the communication device executes the method described in any one of the first to sixth aspects.

[0018] In a fourteenth aspect, a communication device is provided, comprising a processor for calling a program from a memory so that the communication device executes the method described in any one of the first to sixth aspects.

[0019] In a fifteenth aspect, a chip is provided, comprising a processor for calling a program from a memory so that a device equipped with the chip executes the method described in any one of the first to sixth aspects.

[0020] In the sixteenth aspect, a computer-readable storage medium is provided, on which a program is stored, wherein the program enables a computer to execute the method described in any one of the first to sixth aspects.

[0021] In the seventeenth aspect, a computer program product is provided, comprising a program, wherein the program enables a computer to execute the method described in any one of the first to sixth aspects.

[0022] In the eighteenth aspect, a computer program is provided, which enables a computer to execute the method described in any one of the first to sixth aspects.

[0023] In an embodiment of the present application, the first terminal device receives the first PSSCH in the second time slot according to the first PSCCH, without caching the PSSCH in each time slot, thereby helping to reduce power consumption of the terminal device in sideline communications. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is an example diagram of a wireless communication system used in an embodiment of the present application.

[0025] FIG2 is a schematic diagram showing that part of the symbols in a time slot are used for sidelink transmission.

[0026] FIG3 is a schematic diagram of the PSCCH and PSSCH time slot structure.

[0027] FIG4 is a schematic diagram of the time domain positions of four DMRS symbols in a 13-symbol PSSCH.

[0028] FIG5 is a schematic diagram of the frequency domain position of the PSSCH DMRS.

[0029] Figure 6 is a schematic diagram of the PSCCH and PSSCH resource pools in NR-V2X.

[0030] FIG7 is a schematic diagram of the time slot structure in the NR system.

[0031] Figure 8 is a schematic diagram of time domain resources in NR-V2X.

[0032] FIG9 is a schematic diagram of interleaving resource blocks.

[0033] FIG10 is a schematic diagram of a frame structure based on interleaved resource blocks.

[0034] FIG11 is a schematic diagram of RB sets on an unlicensed spectrum.

[0035] FIG12 is a schematic flowchart of a communication method provided in one embodiment of the present application.

[0036] FIG13 is a schematic diagram of an OFDM symbol used for PSCCH in one embodiment of the present application.

[0037] FIG14 is a schematic diagram of an OFDM symbol used for PSCCH in another embodiment of the present application.

[0038] FIG15 is a schematic flowchart of a communication method provided in another embodiment of the present application.

[0039] FIG16 is a schematic flowchart of a communication method provided in yet another embodiment of the present application.

[0040] FIG17 is a schematic structural diagram of a communication device provided in one embodiment of the present application.

[0041] FIG18 is a schematic structural diagram of a communication device provided in another embodiment of the present application.

[0042] FIG19 is a schematic structural diagram of a communication device provided in yet another embodiment of the present application.

[0043] FIG20 is a schematic structural diagram of a communication device provided in yet another embodiment of the present application.

[0044] FIG21 is a schematic structural diagram of a communication device provided in yet another embodiment of the present application.

[0045] FIG22 is a schematic structural diagram of a communication device provided in yet another embodiment of the present application.

[0046] FIG23 is a schematic structural diagram of a device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0047] The technical solution in this application will be described below with reference to the accompanying drawings.

[0048] FIG1 illustrates a wireless communication system 100 used in an embodiment of the present application. The wireless communication system 100 may include a network device 110 and a user equipment (UE) 120. The network device 110 may communicate with the UE 120. The network device 110 may provide communication coverage for a specific geographic area and may communicate with the UE 120 within the coverage area. The UE 120 may access a network (e.g., a wireless network) through the network device 110.

[0049] Figure 1 exemplarily shows a network device and two UEs. Optionally, the wireless communication system 100 may include multiple network devices, and each network device may include a different number of terminal devices within its coverage area, which is not limited in this embodiment of the present application. Optionally, the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in this embodiment of the present application.

[0050] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: fifth generation (5G) system or new radio (NR), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), etc. The technical solutions provided in this application can also be applied to future communication systems, such as the sixth generation mobile communication system, satellite communication system, etc.

[0051] The UE in the embodiments of the present application may also be referred to as a terminal device, an access terminal, a user unit, a user station, a mobile station, a mobile station (MS), a mobile terminal (MT), a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user apparatus. The UE in the embodiments of the present application may refer to a device that provides voice and / or data connectivity to a user and can be used to connect people, objects, and machines, such as a handheld device or an in-vehicle device with wireless connection capabilities. The UE in the embodiments of the present application can be a mobile phone, a tablet computer, a laptop computer, a PDA, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. Optionally, the UE can be used to act as a base station. For example, the UE can act as a scheduling entity that provides sidelink signals between UEs in V2X or D2D, etc. For example, a cellular phone and a car communicate with each other using sidelink signals. The cellular phone and smart home devices communicate without relaying the communication signal through a base station.

[0052] The network device in the embodiments of the present application may be a device for communicating with a UE, and may also be referred to as an access network device or a radio access network device. For example, the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (RAN) node (or device) that connects a UE to a wireless network. A base station may broadly cover various names as follows, or be replaced with the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station MeNB, secondary station SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. A base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof.

[0053] In some embodiments, the network device can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile network device, and one or more cells can move according to the location of the mobile network device. In other examples, the helicopter or drone can be configured to act as a device for communicating with another network device. In some embodiments, the network device can refer to a CU or a DU, or the network device can include a CU and a DU, or the network device can also include an AAU.

[0054] It should be understood that network devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on water; and can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the network devices and the scenarios in which they are used.

[0055] It should also be understood that all or part of the functions of the network device and UE in this application can also be implemented through software functions running on hardware, or through virtualization functions instantiated on a platform (such as a cloud platform).

[0056] The technical solutions in the embodiments of this application can be applied to sidelinks (SL). New Radio Vehicle to Everything (NR-V2X) is a sidelink transmission technology used in vehicular wireless communications. The following describes sidelinks using NR-V2X as an example.

[0057] In NR-V2X, the physical sidelink shared channel (PSSCH) and its associated physical sidelink control channel (PSCCH) are transmitted in the same time slot, and the PSCCH occupies 2 or 3 time domain symbols. The time domain resource allocation of NR-V2X is based on the time slot as the allocation granularity. For example, the starting point and length of the time domain symbols used for sidelink transmission in a time slot can be configured by the parameters sl-startSLsymbols and sl-lengthSLsymbols. The last symbol in this part of the symbols is used as the guard period (GP) symbol. PSSCH and PSCCH can only use the remaining time domain symbols. However, if the physical sidelink feedback channel (PSFCH) transmission resources are configured in a time slot, PSSCH and PSCCH cannot occupy the time domain symbols used for PSFCH transmission, as well as the automatic gain control (AGC) and GP symbols before the symbol.

[0058] As shown in Figure 2, the network configuration sl-StartSymbol = 3, sl-LengthSymbols = 11, that is, the 11 time domain symbols starting from symbol index 3 in a time slot can be used for sideline transmission. There are PSFCH transmission resources in the time slot. The PSFCH occupies symbols 11 and 12, among which symbol 11 is used as the AGC symbol of PSFCH, and symbols 10 and 13 are used as GPs respectively. The time domain symbols that can be used for PSSCH transmission are symbols 3 to 9. PSCCH occupies 3 time domain symbols, namely symbols 3, 4, and 5, and symbol 3 is usually used as an AGC symbol.

[0059] In NR-V2X, in addition to PSCCH and PSSCH, PSFCH may also exist in a sidelink time slot. As shown in Figure 3. It can be seen that in a time slot, the first orthogonal frequency division multiplexing (OFDM) symbol is fixed for AGC. On the AGC symbol, the UE copies the information sent on the second symbol. At the end of the time slot, there is a symbol reserved for transceiver conversion, which is used for the UE to switch from the transmit (or receive) state to the receive (or transmit) state. In the remaining OFDM symbols, PSCCH can occupy two or three OFDM symbols starting from the second sidelink symbol. In the frequency domain, the number of physical resource blocks (PRBs) occupied by PSCCH is within the subband range of a PSSCH. If the number of PRBs occupied by PSCCH is less than the size of a PSSCH subchannel, or the frequency domain resources of PSSCH include multiple subchannels, then PSCCH can be frequency-division multiplexed with PSSCH on the OFDM symbol where PSCCH is located.

[0060] The demodulation reference signal (DMRS) for the PSSCH in NR-V2X draws on the design of the NR Uu interface and uses multiple time-domain PSSCH DMRS patterns. Within a resource pool, the number of available DMRS patterns is related to the number of PSSCH symbols in the resource pool. For a specific number of PSSCH symbols (including the first AGC symbol) and PSCCH symbols, the available DMRS patterns and the position of each DMRS symbol within the pattern are shown in Table 1. Figure 4 shows a schematic diagram of the time-domain positions of four DMRS symbols when the PSSCH has 13 symbols.

[0061] Table 1 Number and position of DMRS symbols under different PSSCH and PSCCH symbol numbers

[0062] If multiple time-domain DMRS patterns are configured within the resource pool, the transmitting UE selects the specific time-domain DMRS pattern to use and indicates this in the first-order SCI. This design allows high-speed UEs to select a high-density DMRS pattern, thereby ensuring accurate channel estimation, while low-speed UEs can use a low-density DMRS pattern, thereby improving spectrum efficiency.

[0063] The generation method of the PSSCH DMRS sequence is almost identical to that of the PSCCH DMRS sequence. The only difference is the initialization formula c(m) of the pseudo-random sequence. init middle, pi is the i-th cyclic redundancy check (CRC) of the PSCCH that schedules the PSSCH, where L is the number of bits of the PSCCH CRC, and L=24.

[0064] The NR physical downlink shared channel (PDSCH) and physical uplink shared channel (PUSCH) support two frequency domain DMRS patterns, namely DMRS frequency domain type 1 and DMRS frequency domain type 2. For each frequency domain type, there are two different types: single DMRS symbol and double DMRS symbol. Single-symbol DMRS frequency domain type 1 supports 4 DMRS ports, and single-symbol DMRS frequency domain type 2 can support 6 DMRS ports. In the case of double DMRS symbols, the number of supported ports is doubled. However, in NR-V2X, since PSSCH only needs to support two DMRS ports at most, only single-symbol DMRS frequency domain type 1 is supported, as shown in Figure 5.

[0065] Similar to LTE-V2X, the frequency domain resources in the NR-V2X resource pool are contiguous, and the frequency domain resource allocation granularity is also subchannel. The number of PRBs included in a subchannel is {10, 12, 15, 20, 50, 75, 100}. The minimum subchannel size is 10 PRBs, which is much larger than the minimum subchannel size of 4 PRBs in LTE-V2X. This is mainly because the frequency domain resources of the PSCCH in NR-V2X are located in the first subchannel of its associated PSSCH. The frequency domain resources of the PSCCH are less than or equal to the size of a PSSCH subchannel, while the time domain resources of the PSCCH occupy two or three OFDM symbols. If the subchannel size is configured too small, the available PSCCH resources will be limited, the code rate will increase, and the detection performance of the PSCCH will be reduced. In NR-V2X, the PSSCH subchannel size and the PSCCH frequency domain resource size are configured independently, but the PSCCH frequency domain resources must be less than or equal to the PSSCH subchannel size. The following configuration parameters in the NR-V2X resource pool configuration information are used to determine the frequency domain resources of the PSCCH and PSSCH resource pools:

[0066] Subchannel size (sl-SubchannelSize): indicates the number of consecutive PRBs in a subchannel in the resource pool. The value range is {10, 12, 15, 20, 50, 75, 100} PRBs.

[0067] Number of subchannels (sl-NumSubchannel): indicates the number of subchannels included in the resource pool;

[0068] sl-StartRB-Subchannel: indicates the starting PRB index of the first subchannel in the resource pool.

[0069] PRB number (sl-RB-Number): indicates the number of consecutive PRBs included in the resource pool;

[0070] PSCCH frequency domain resource indicator (sl-FreqResourcePSCCH): indicates the frequency domain resource size of PSCCH, and the value range is {10, 12, 15, 20, 25} PRB.

[0071] When the UE determines the resource pool for PSSCH transmission or PSSCH reception, the frequency domain resources included in the resource pool are sl-NumSubchannel consecutive subchannels starting from the PRB indicated by sl-StartRB-Subchannel. If the number of PRBs contained in the final sl-NumSubchannel consecutive subchannels is less than the number of PRBs indicated by sl-RB-Number, the remaining PRBs cannot be used for PSSCH transmission or reception.

[0072] In NR-V2X, the frequency domain starting position of the first subchannel of PSCCH and its associated PSSCH is aligned. Therefore, as shown in Figure 6, the starting position of each PSSCH subchannel is the possible frequency domain starting position of PSCCH. The frequency domain range of the resource pool of PSCCH and PSSCH can be determined according to the above parameters.

[0073] In NR-V2X, the PSCCH is used to carry side control information related to resource sensing, including:

[0074] The priority of the scheduled transmission;

[0075] Frequency domain resource allocation, indicating the number of frequency domain resources for the PSSCH in the current time slot scheduled by the PSCCH, as well as the number and starting positions of the frequency domain resources for a maximum of two retransmission resources reserved;

[0076] Time domain resource allocation, indicating the time domain locations of up to two retransmission resources;

[0077] PSSCH reference signal pattern;

[0078] Second-order sidelink control information (SCI) format;

[0079] Second-order SCI (such as SCI 2-A or SCI 2-B) rate offset;

[0080] Number of PSSCH DMRS ports;

[0081] Modulation and coding scheme (MCS);

[0082] MCS form instructions;

[0083] Number of PSFCH symbols;

[0084] Resource reservation period: reserves resources for another transport block (TB) to be sent in the next period. If inter-TB resource reservation is not activated in the resource pool configuration, this information bit field does not exist.

[0085] Reserved bits: 2 to 4 bits. The specific number of bits is configured by the network or pre-configured.

[0086] Since the PSCCH is always transmitted in the same time slot as the scheduled PSSCH, and the starting position of the PRB occupied by the PSCCH is the starting position of the first subchannel of the scheduled PSSCH, the SCI format 1-A does not explicitly indicate the time-frequency domain starting position of the scheduled PSSCH.

[0087] In NR-V2X, the transmission of PSCCH / PSSCH is based on the time slot level, that is, only one PSCCH / PSSCH can be transmitted in one time slot. It does not support the transmission of multiple PSCCH / PSSCH in one time slot through time division multiplexing (TDM). The PSCCH / PSSCH between different users can be multiplexed in one time slot through frequency division multiplexing (FDM). The time domain resources of PSSCH in NR-V2X are based on the time slot granularity, but unlike the PSSCH in LTE-V2X that occupies all the time domain symbols in a subframe, the PSSCH in NR-V2X can occupy part of the symbols in a time slot. This is mainly because in the LTE system, uplink or downlink transmissions are also based on the subframe granularity, so the side transmission is also based on the subframe granularity (special subframes in the TDD system are not used for side transmission). The NR system uses a flexible time slot structure, meaning that a time slot includes both uplink and downlink symbols, enabling more flexible scheduling and reducing latency. A typical NR system subframe is shown in Figure 7. A time slot can include downlink (DL) symbols, uplink (UL) symbols, and flexible symbols. Downlink symbols are located at the beginning of the time slot, while uplink symbols are located at the end of the time slot. Flexible symbols are located between downlink and uplink symbols, and the number of each type of symbol in each time slot is configurable.

[0088] The sidelink transmission system can share a carrier with the cellular system. In this case, sidelink transmission can only use the cellular system's uplink transmission resources. For NR-V2X, if sidelink transmission still needs to occupy all time-domain symbols in a timeslot, the network must configure a timeslot full of uplink symbols for sidelink transmission. This will significantly impact the uplink and downlink data transmission of the NR system and reduce system performance. Therefore, NR-V2X supports the use of a portion of the time-domain symbols in a timeslot for sidelink transmission, that is, a portion of the uplink symbols in a timeslot are used for sidelink transmission. In addition, considering that sidelink transmission includes AGC symbols and GP symbols, if the number of uplink symbols available for sidelink transmission is small, removing AGC symbols and GP symbols will leave even fewer symbols available for transmitting valid data, resulting in low resource utilization. Therefore, in NR-V2X, the minimum number of time-domain symbols occupied by sidelink transmission is seven (including GP symbols). When the sidelink transmission system uses a dedicated carrier, there is no issue of sharing transmission resources with other systems, and all symbols in the timeslot can be configured for sidelink transmission.

[0089] As mentioned above, NR-V2X configures the starting point and length of the time domain symbol used for sideline transmission in a time slot through the parameters starting symbol position (sl-StartSymbol) and number of symbols (sl-LengthSymbols). The last symbol in the time domain symbol used for sideline transmission is used as the guard interval GP. PSSCH and PSCCH can only use the remaining time domain symbols. However, if PSFCH transmission resources are configured in a time slot, PSSCH and PSCCH cannot occupy the time domain symbol used for PSFCH transmission, as well as the AGC and GP symbols before the symbol.

[0090] In the NR-V2X system, the time domain resources of the resource pool are also indicated by a bitmap. Considering the flexible time slot structure in the NR system, the length of the bitmap has been extended to support a bitmap length range of [10:160]. The method of using the bitmap to determine the time slot position belonging to the resource pool within an SFN cycle is the same as that in LTE-V2X, but with the following two differences:

[0091] The total number of time slots included in a system frame number (SFN) period is 10240×2 μ , where the parameter μ is related to the subcarrier spacing;

[0092] If at least one of the time-domain symbols Y, Y+1, Y+2, …, Y+X-1 included in a time slot is not configured as an uplink symbol by the network's TDD-UL-DL-ConfigCommon signaling, then the time slot cannot be used for sidelink transmission. Where Y and X represent sl-StartSymbol and sl-LengthSymbols, respectively.

[0093] The specific steps include:

[0094] Step 1: Remove the time slots that do not belong to the resource pool within the SFN cycle, including synchronization time slots and time slots that cannot be used for sideline transmission. The remaining time slots are represented as the remaining time slot set, and the remaining time slots are renumbered as

[0095] in:

[0096] N S_SSB Indicates the number of synchronization time slots in an SFN cycle; the synchronization time slot is determined according to synchronization-related configuration parameters, and is related to the period of transmission of synchronization signal blocks (SSBs) and the number of SSB transmission resources configured in the period;

[0097] N nonSLIndicates the number of time slots in an SFN cycle that do not comply with the uplink symbol start point and number configuration: If at least one of the time domain symbols Y, Y+1, Y+2, …, Y+X-1 included in a time slot is not semi-statically configured as an uplink symbol, then the time slot cannot be used for sidelink transmission, where Y and X represent sl-StartSymbol and sl-LengthSymbols, respectively.

[0098] Step 2: Determine the number of reserved time slots and the corresponding time domain positions.

[0099] If the number of time slots in the remaining time slot set cannot be divided by the bitmap length, the number of reserved time slots and the corresponding time domain positions need to be determined. r (0≤r<10240×2 μ -N S_SSB -N nonSL ) satisfies the following conditions, then the time slot is a reserved time slot,

[0100] in:

[0101] N reserved =(10240×2 μ -N S_SSB -N nonSL )mod L bitmap , represents the number of reserved time slots, L bitmap Indicates the length of the bitmap, m = 0, ..., N reserved -1.

[0102] Step 3: Remove the reserved time slots from the remaining time slot set. The remaining time slot set is represented as a logical time slot set. The time slots in the time slot set are all time slots that can be used in the resource pool. The time slots in the logical time slot set are renumbered as Among them, T max =10240×2 μ -N S_SSB -N nonSL -N reserved .

[0103] Step 4: Determine the time slots in the logical time slot set that belong to the resource pool according to the bitmap.

[0104] The bitmap in the resource pool configuration information is For a time slot in a logical time slot set When b is satisfied k′ =1, the time slot belongs to the resource pool, where k′=k mod L bitmap .

[0105] Step 5: Renumber the time slots belonging to the resource pool determined in step 4 in order Among them, T′ max Indicates the number of time slots included in the resource pool.

[0106] As shown in FIG8 , an SFN cycle (or direct frame number (DFN) cycle) includes 10240 subframes. The synchronization signal period is 160 ms, and one synchronization cycle includes two synchronization subframes. Therefore, there are a total of 128 synchronization subframes in one SFN cycle. The length of the bitmap used to indicate the time domain resources of the resource pool is 10 bits, so two reserved subframes are required. The number of remaining subframes is (10240-128-2=10110), which is evenly divisible by the bitmap length of 10. The remaining subframes are renumbered as 0, 1, 2, ..., 10109, with the first three bits of the bitmap being 1 and the remaining seven bits being 0. That is, in the remaining subframes, the first three subframes out of every ten subframes belong to the resource pool, and the remaining subframes do not belong to the resource pool. Since the bitmap needs to be repeated 1011 times in the remaining subframes to indicate whether all subframes belong to the resource pool, and each bitmap period includes 3 subframes, a total of 3033 subframes belong to the resource pool in one SFN period.

[0107] When performing sidelink transmission over unlicensed spectrum (SL-U), sidelink transmission must meet specific regulatory requirements, including minimum occupied channel bandwidth (OCB) and maximum power spectral density (PSD). For OCB, the UE must occupy at least 80% of the channel bandwidth when using the channel for data transmission. For maximum power spectral density, the UE's transmit power per 1 MHz must not exceed 10 dBm. To meet OCB and PSD regulatory requirements, sidelink transmission over unlicensed spectrum must adopt an interlaced resource block (IRB) structure. An IRB consists of N discrete RBs in the frequency domain, with a total of M IRBs within the frequency band. The mth IRB consists of RBs in the order {m, M+m, 2M+m, 3M+m, ...}, where M and N are integers and m is an integer greater than or equal to 0 and less than or equal to M.

[0108] As shown in FIG9 , the system bandwidth includes 20 RBs, including 5 IRBs (i.e., M=5), each IRB includes 4 RBs (i.e., N=4), and the frequency domain intervals of two adjacent RBs belonging to the same IRB are the same, i.e., 5 RBs apart. The numbers in the boxes in the figure represent the IRB indexes.

[0109] In the SL-U system, if IRB-based resource allocation granularity is adopted, channels such as the PSCCH and PSSCH in the SL-U system should all be based on the IRB structure. In this case, the frame structure of the SL-U system is shown in Figure 10, where the numbers within the boxes represent the IRB indexes. Figure 10 illustrates a frame structure where only the PSCCH and PSSCH are included in a time slot, excluding the PSFCH. The bandwidth shown in Figure 10 consists of 20 RBs, with five IRB resources configured (i.e., M = 5). Each IRB resource consists of four RBs, and the numbers within the boxes represent the IRB indexes. In Figure 10, the system configures the PSCCH to occupy one IRB resource in the frequency domain and two OFDM symbols in the time domain. The PSSCH uses IRB granularity, with the first symbol in the time slot being an AGC symbol and the last symbol being a GP symbol. In Figure 10, PSSCH1 occupies IRB#0 and IRB#1, with its corresponding PSCCH1 occupying IRB#0. PSSCH2 occupies IRB#2, with its corresponding PSCCH2 also occupying IRB#2. It should be noted that, for the sake of simplicity, FIG10 does not show the resources occupied by the second-order SCI and the resources occupied by the PSCCH DMRS and PSSCH DMRS.

[0110] UEs access channels in unlicensed spectrum using LBT, which uses a 20 MHz granularity in the frequency domain. As shown in Figure 11, each 20 MHz interval is called an RB set. A carrier can contain multiple RB sets, with guard bands (or guard intervals) between them.

[0111] At present, the application of sideline communication is becoming more and more extensive. For example, in scenarios such as smart homes and smart factories, sideline communication can be used for communication of wearable devices. In these scenarios, it is extremely important to ensure the low cost and low power consumption of terminal devices. However, in existing sideline communication systems, terminal devices need to frequently detect first-order SCI and second-order SCI, and decode PSSCH based on the detection results. The power consumed by detecting first-order SCI and second-order SCI accounts for approximately 70% of the total power consumed in a time slot. Therefore, how to reduce the power consumed by UE to detect first-order SCI and / or second-order SCI in sideline communication has become a technical problem that needs to be solved urgently.

[0112] In order to solve one or more of the above technical problems, the present application proposes a communication method and a communication device.

[0113] The embodiments of the present application are described in detail below with reference to FIG. 12 to FIG. 16 .

[0114] Figure 12 is a schematic flow chart of a communication method according to an embodiment of the present application. The method 1200 shown in Figure 12 may include steps S1210 and S1220, as follows:

[0115] S1210, a first terminal device receives a first PSCCH sent by a second terminal device in a first time slot, where the first PSCCH is used to schedule a first PSSCH.

[0116] Among them, the first terminal device can be a receiving UE, and the second terminal device can be a sending UE.

[0117] S1220, the first terminal device receives the first PSSCH sent by the second terminal device in the second time slot according to the first PSCCH.

[0118] The interval between the first time slot and the second time slot may be greater than or equal to X time slots, where X is a positive integer.

[0119] Optionally, the first terminal device may receive the first PSSCH in the second time slot based on the first PSCCH, or may not receive the first PSSCH in the second time slot based on the first PSCCH. For example, if the first terminal device successfully decodes the first PSCCH, the first PSSCH may be received based on the decoding result of the first PSCCH; if the first terminal device fails to successfully decode the first PSCCH, the first PSSCH may not be received based on the decoding result of the first PSCCH.

[0120] In the prior art, the first terminal device receives the PSCCH and the PSSCH scheduled by the PSCCH in a time slot, and the first terminal device needs to receive and cache the PSCCH and PSSCH in each time slot. Therefore, a large amount of power is consumed. In an embodiment of the present application, the first terminal device can receive the first PSSCH in the second time slot based on the first PSCCH, and there is no need to cache the PSSCH in each time slot, which helps to reduce the power consumption of the terminal device in side communication.

[0121] Optionally, the duration of the first terminal device decoding the PSCCH may be less than or equal to X time slots. In an embodiment of the present application, if the first terminal device successfully decodes the first PSCCH, it may determine whether to receive the first PSSCH based on the decoding result of the first PSCCH, without having to receive the first PSSCH in each time slot. Therefore, the power consumption of the terminal device may be reduced in sideline communication.

[0122] Optionally, X may be determined according to any of the following methods: defined by a standard (such as a communication standard), configured by a network, pre-configured, and determined by the first terminal device.

[0123] In some embodiments, the first PSCCH may occupy specific frequency domain resources within a specific OFDM symbol within a time slot. For example, the first PSCCH may be transmitted via a first resource, which may occupy a portion of the OFDM symbols within the first time slot. Optionally, the first resource may belong to a dedicated sidelink resource pool or a dedicated sidelink bandwidth part (BWP).

[0124] Optionally, the partial OFDM symbols may be the N OFDM symbols at the beginning of the first time slot, or the partial OFDM symbols may be the N OFDM symbols at the end of the first time slot, where N is a positive integer. Optionally, if located at the beginning of the time slot, the N OFDM symbols may include OFDM symbols used for AGC; if located at the end of the time slot, the N OFDM symbols may include OFDM symbols used for transceiver switching. Optionally, N may be determined according to any of the following methods: standard-defined, network-configured, or pre-configured. For example, N may be 2 or 3.

[0125] Optionally, the first resource may occupy M PRBs or M IRBs within the portion of OFDM symbols, where M is a positive integer. Optionally, M may be determined according to any of the following methods: standard definition, network configuration, and preconfigured. For example, M may be 10 (e.g., 10 PRBs) or 1 (e.g., 1 IRB).

[0126] There may be resources for PSSCH transmission within the N symbols. If there are PSSCH resources, the frequency domain resources where the PSSCH resources are located do not overlap with the frequency domain resources used for PSCCH. OFDM symbols other than the N OFDM symbols in the time slot may be used for other sidelink physical channels.

[0127] If the N OFDM symbols are located at the beginning of a time slot, a transmit / receive switching interval and an OFDM symbol used for AGC may exist between the N OFDM symbols and subsequent OFDM symbols in the time slot. For example, as shown in FIG13 , the first time slot may include 14 OFDM symbols, and some of the OFDM symbols may be the first three (i.e., the first three) OFDM symbols in the first time slot.

[0128] If the N OFDM symbols are at the end of a time slot, a transmit / receive transition interval may exist before the N OFDM symbols. As shown in FIG14 , the first time slot may include 14 OFDM symbols, and the partial OFDM symbols may be the last three (i.e., the last three) OFDM symbols in the first time slot.

[0129] In this way, PSCCH resources can be configured more flexibly, which is suitable for application in a BWP or resource pool where there is no backward UE. Wherein, the backward UE may refer to a UE that does not support the PSCCH reception method in this application.

[0130] In some embodiments, the first resource may occupy an OFDM symbol containing a configured or preconfigured PSFCH within the first time slot. The first resource may occupy M PRBs or IRBs within the OFDM symbol containing the PSFCH within the first time slot. Optionally, some or all of the OFDM symbols containing the PSFCH within the resource pool containing the first time slot may be used for the first resource.

[0131] Optionally, within the OFDM symbol where the PSFCH is located, the PRB or IRB used for the PSCCH may be indicated by configuration or pre-configuration signaling, and the PRB or IRB used for the PSFCH may also be indicated by configuration or pre-configuration signaling. Optionally, there is no overlap between the PRB / IRB set used for the PSCCH and the PRB / IRB set used for the PSFCH.

[0132] In the above embodiment, the same resource pool may be shared with the backward UE.

[0133] In some embodiments, the second terminal device may occupy one or more first resources to send a first PSCCH. Optionally, the CRC of the first PSCCH may not be scrambled, or may be scrambled with an identifier (ID) corresponding to the first terminal device. The ID corresponding to the first terminal device may be a UE ID or other ID corresponding to the first terminal device.

[0134] For example, if the PSCCH sent by the second terminal device is only for a specific receiving UE (such as unicast communication), the CRC of the PSCCH can be scrambled with the ID corresponding to the receiving UE, otherwise, the CRC of the PSCCH may not be scrambled.

[0135] Figure 15 is a schematic flow chart of a communication method according to an embodiment of the present application. The method 1500 shown in Figure 15 may include steps S1510 and S1520, as follows:

[0136] S1510, the first terminal device detects the first SCI sent by the second terminal device in the first time slot.

[0137] Among them, the first terminal device can be a receiving UE, and the second terminal device can be a sending UE.

[0138] S1520: The first terminal device determines, based on the first SCI, whether to detect the second SCI sent by the second terminal device in the first time slot.

[0139] The first SCI may be a first-order SCI, and the second SCI may be a second-order SCI. The first SCI may be carried in a PSCCH. The second SCI may be carried in a PSSCH. The PSCCH carrying the first SCI may be used to schedule a PSSCH carrying the second SCI.

[0140] Optionally, the time-frequency resource multiplexing method of the PSCCH and the PSSCH scheduled by the PSCCH can be the same as described in the aforementioned embodiments (such as the embodiments corresponding to Figures 2 to 11). For example, the PSCCH and the PSSCH scheduled by the PSCCH are located in the same time slot. Optionally, the PSCCH occupies some PRBs or IRBs in some OFDM symbols within the time slot, and the PSCCH and the OFDM symbols scheduled by the PSCCH are frequency-division multiplexed or time-division multiplexed.

[0141] In some embodiments, a first field (eg, one or more bits) in the first SCI may be used to indicate whether the second SCI needs to be detected.

[0142] Alternatively, the second terminal device may determine the first field in the first SCI. For example, if the higher layer indicates that the second SCI is to be sent, the second terminal device may set the first field in the first SCI to 1. Alternatively, the second terminal device may determine whether to send the second SCI in the first time slot based on the first field in the first SCI.

[0143] Accordingly, the first terminal device may determine whether to detect the second SCI in the first time slot according to the first field in the first SCI. For example, if the first field in the first SCI is 1, the first terminal device may further detect the second SCI; otherwise, the first terminal device may not detect the second SCI.

[0144] Optionally, the first field may include one or more bits in a reserved bit field (reserved) in the first SCI. Alternatively, the first field may also include other fields or domains in the first SCI, which is not limited in the present application.

[0145] In some embodiments, the scrambling code sequence used by the DMRS of the PSCCH carrying the first SCI may be used to indicate whether the second SCI needs to be detected.

[0146] Optionally, the first SCI may be carried in the first PSCCH, and the second terminal device may determine the scrambling sequence used by the DMRS of the first PSCCH. For example, if the upper layer indicates the first scrambling sequence, the second terminal device may use the first scrambling sequence to send the DMRS of the PSCCH; otherwise, the second terminal device may randomly select a scrambling sequence from {1,1,1}, {1,e j2 / 3π , e -j2 / 3π} and {1,e -j2 / 3π, e j2 / 3π}Select a scrambling code sequence to send the DMRS of PSCCH.

[0147] Accordingly, the first terminal device may determine whether to detect the second SCI in the first time slot based on the scrambling sequence used by the DMRS of the first PSCCH. For example, if the DMRS of the first PSCCH uses the first scrambling sequence, the first terminal device may determine to detect the second SCI in the first time slot; otherwise, the second SCI is not detected.

[0148] Optionally, the first scrambling sequence may be {1,1,1}, {1,e j2 / 3π , e -j2 / 3π} and {1,e -j2 / 3π , e j2 / 3π Optionally, the first scrambling code sequence may be determined according to any one of the following ways: defined by a standard, configured by a network, pre-configured, determined by the first terminal device, and determined by the second terminal device.

[0149] In the embodiment of the present application, the first terminal device determines whether to detect the second SCI based on the first SCI. This eliminates the need to detect the second SCI in every time slot, thereby reducing the power loss of the terminal device caused by detecting the second SCI. Therefore, the power consumption of the terminal device can be reduced during sideline communication. The method in the embodiment of the present application does not require the introduction of a new PSCCH, and the changes to the standard are relatively minor. Furthermore, this method facilitates sharing the same resource pool with backward UEs.

[0150] Figure 16 is a schematic flow chart of a communication method according to an embodiment of the present application. The method 1600 shown in Figure 16 may include steps S1610 and S1620, as follows:

[0151] S1610, the first terminal device receives the first PSSCH sent by the second terminal device according to the first information.

[0152] Among them, the first terminal device can be a receiving UE, and the second terminal device can be a sending UE.

[0153] S1620, the first terminal device decodes the first PSSCH according to the first DMRS.

[0154] Optionally, the first information may include one or more of the following: the first DMRS, the time-frequency position of the first DMRS, the side configuration authorization information, the size of the frequency domain resources occupied by the first PSSCH, the modulation and coding scheme (MCS) adopted by the first PSSCH, the sequence corresponding to the first DMRS (such as the scrambling code sequence corresponding to the first DMRS), the time-frequency position of the first DMRS, the code rate adopted by the second SCI corresponding to the first PSSCH, and the size of the TB sent by the first PSSCH. Optionally, the sequence corresponding to the first DMRS may also be referred to as the sequence of the first DMRS or the first DMRS sequence. The sequence corresponding to the first DMRS may be known to the first terminal device.

[0155] Optionally, the sequence corresponding to the first DMRS may be a pseudo-random sequence obtained after initialization according to the identifier corresponding to the first terminal device. Optionally, the time-frequency position of the first DMRS may include resource elements (REs) indexed as #1, #3, #5, #7, #9 and #11 within the PRB.

[0156] Optionally, the first PSSCH may correspond to the first DMRS. Optionally, the first PSSCH and the first DMRS may belong to a mode 1 resource pool or a mode 2 resource pool.

[0157] In some embodiments, for the retransmission of a TB, the first terminal device may not receive the SCI (such as the first SCI and / or the second SCI).

[0158] Optionally, the first information may also include resource reservation information indicated by the SCI previously received by the first terminal device (such as the reserved resources indicated by the first SCI and / or the reserved resources indicated by the second SCI), and the first PSSCH may be used to carry retransmitted data.

[0159] For example, the MCS and number of DMRS symbols used for the new transmission and all retransmissions of a TB are the same. If the first terminal device receives the first SCI that schedules a TB, then for the reserved resources indicated by the first SCI, the first terminal device may not detect the first SCI when receiving the retransmission of the TB, but directly decode the PSSCH. For another example, for the second terminal device, the second SCI sent to indicate the retransmission of the TB may include the time-frequency position of the reserved resources for the retransmission of the TB; the PSSCH carrying the second SCI and the retransmitted TB corresponds to at least a DMRS sequence known to the first terminal device (such as a pseudo-random sequence initialized by the ID of the first terminal device as a DMRS sequence), thereby ensuring that the first terminal device can still decode the PSSCH without decoding the first SCI.

[0160] Optionally, the first PSSCH and the first DMRS may belong to a mode 1 resource pool or a mode 2 resource pool.

[0161] For example, if the first PSSCH and the first DMRS belong to a mode 1 resource pool or a mode 2 resource pool, but the reference signal used for channel sensing in the resource pool is the DMRS of the PSCCH (ie, the DMRS of the PSCCH is used to measure the SL reference signal received power (reference signal receiving power, RSRP) for channel sensing), then the time-frequency position occupied by the first DMRS sequence can be:

[0162] The time-frequency resource positions occupied by the DMRS of the PSSCH in the SL system are the same as those in the embodiments corresponding to Figures 3 to 5; or, the time domain resource positions occupied by the DMRS of the PSSCH in the SL system are the same as those in the embodiments corresponding to Figures 3 to 5, and the occupied RE positions are REs indexed as #1, #3, #5, #7, #9 and #11 in the PRB; or, the time-frequency resource positions occupied by the DMRS of the PSSCH in the SL system are different from those in the embodiments corresponding to Figures 3 to 5.

[0163] Optionally, the first PSSCH and the first DMRS may belong to a mode 2 resource pool.

[0164] For example, if the first PSSCH and the first DMRS belong to the mode 2 resource pool, and the reference signal for channel sensing in the resource pool is the DMRS of the PSSCH (that is, the SL RSRP for channel sensing is measured using the DMRS of the PSSCH), the second terminal device needs to send the first SCI. In order to avoid affecting the channel sensing, the second terminal device can additionally send the same PSSCH DMRS as the existing SL system at the time-frequency resource position occupied by the DMRS of the PSSCH in the existing SL system. The time-frequency position occupied by the first DMRS sequence can be:

[0165] The time domain resource positions occupied by the DMRS of the PSSCH in the SL system in the embodiments corresponding to Figures 3 to 5 are the same, and the occupied RE positions are REs indexed as #1, #3, #5, #7, #9 and #11 in the PRB; or, the time-frequency resource positions occupied by the DMRS of the PSSCH in the SL system in the embodiments corresponding to Figures 3 to 5 are different.

[0166] In the above embodiment, the first terminal device receives the PSCCH scheduling the new transmission TB only within a specific time and frequency domain range, without having to detect the second SCI in every time slot, thereby reducing the power loss of the terminal device caused by detecting the SCI. The specific time and frequency domain range is a subset of the receiving resource pool of the first terminal device, and the specific time and frequency domain range can be configured or pre-configured by the network.

[0167] In some embodiments, the first terminal device receives the PSSCH at the time-frequency position indicated by the sideline configuration authorization information (without receiving the SCI).

[0168] Optionally, the sideline configuration authorization information may be the sideline configuration authorization configured by the second terminal device received by the first terminal device. Optionally, the sideline configuration authorization information may be the sideline configuration authorization configured by the second terminal device received by the first terminal device via a PC5 radio resource control (RRC) message or SCI.

[0169] Optionally, the sideline configuration authorization information may include one or more of the following:

[0170] The configuration index of the side configuration authorization (such as SL-ConfigIndexCG), the resource repetition period of the side configuration authorization (such as sl-PeriodCG), the number of hybrid automatic repeat requests (HARQ) of the side configuration authorization (such as sl-NrOfHARQ-Processes), the maximum number of transmissions of a TB in the side configuration authorization (such as sl-CG-MaxTransNum), the time domain resources within a period of the side configuration authorization (such as sl-TimeResourceCG), the frequency domain resources within a period of the side configuration authorization (such as sl-FreqResourceCG), and the resource pool identifier where the side configuration authorization is located (such as sl-ResourcePoolID).

[0171] The PSSCH sent using the side configuration authorization corresponds to at least a DMRS sequence known to the first terminal device (such as a pseudo-random sequence initialized by the ID of the first terminal device as a DMRS sequence), thereby ensuring that the first terminal device can still decode the PSSCH without decoding the first SCI.

[0172] Optionally, the first PSSCH and the first DMRS may belong to a mode 1 resource pool.

[0173] For example, the second terminal device may not send the first SCI, and each time-frequency resource indicated in the side configuration authorization may be used to send PSSCH; the DMRS of the PSSCH may be generated by a sequence generated by the ID corresponding to the first terminal device (such as a pseudo-random sequence initialized by the ID corresponding to the first terminal device).

[0174] Optionally, the first PSSCH and the first DMRS may belong to a mode 2 resource pool.

[0175] For example, if the first PSSCH and the first DMRS belong to the mode 2 resource pool, but the reference signal for channel sounding in the resource pool is the DMRS of the PSCCH (ie, the SL RSRP for channel sounding is measured using the DMRS of the PSCCH), the second terminal device needs to send the first SCI, then the time-frequency position occupied by the first DMRS sequence can be:

[0176] The time-frequency resource positions occupied by the DMRS of the PSSCH in the SL system are the same as those in the embodiments corresponding to Figures 3 to 5; or, the time domain resource positions occupied by the DMRS of the PSSCH in the SL system are the same as those in the embodiments corresponding to Figures 3 to 5, and the occupied RE positions are REs indexed as #1, #3, #5, #7, #9 and #11 in the PRB; or, the time-frequency resource positions occupied by the DMRS of the PSSCH in the SL system are different from those in the embodiments corresponding to Figures 3 to 5.

[0177] Optionally, the first PSSCH and the first DMRS may belong to a mode 2 resource pool.

[0178] For example, if the first PSSCH and the first DMRS belong to the mode 2 resource pool, and the reference signal for channel sensing in the resource pool is the DMRS of the PSSCH (that is, the SL RSRP for channel sensing is measured using the DMRS of the PSSCH), the second terminal device needs to send the first SCI. In order to avoid affecting the channel sensing, the second terminal device can additionally send the same PSSCH DMRS as the existing SL system at the time-frequency resource position occupied by the DMRS of the PSSCH in the existing SL system. The time-frequency position occupied by the first DMRS sequence can be:

[0179] The time domain resource positions occupied by the DMRS of the PSSCH in the SL system in the embodiments corresponding to Figures 3 to 5 are the same, and the occupied RE positions are REs indexed as #1, #3, #5, #7, #9 and #11 in the PRB; or, the time-frequency resource positions occupied by the DMRS of the PSSCH in the SL system in the embodiments corresponding to Figures 3 to 5 are different.

[0180] In the above embodiment, the first terminal device receives the PSCCH only at the time-frequency position indicated by the sideline configuration authorization information, and does not need to detect the first SCI in each time slot, which can reduce the power loss of the terminal device caused by detecting the SCI.

[0181] In some embodiments, the first terminal device only receives a specific first PSSCH and does not need to receive the first SCI.

[0182] The specific first PSSCH may refer to a PSSCH that satisfies at least one of the following:

[0183] The size of the frequency domain resources occupied by the first PSSCH, the modulation and coding scheme (MCS) adopted by the first PSSCH, the sequence corresponding to the first DMRS (such as the scrambling code sequence corresponding to the first DMRS), the time-frequency position of the first DMRS, the code rate adopted by the second SCI (such as the second-order SCI) corresponding to the first PSSCH, and the size of the TB sent by the first PSSCH.

[0184] For example, if the first information includes the size of the frequency domain resources occupied by the first PSSCH, the first terminal device can only receive the PSSCH with the same frequency domain resource size as indicated by the first information; or, if the first information includes the code rate adopted by the second SCI corresponding to the first PSSCH, and the size of the TB sent by the first PSSCH, the first terminal device can only receive the PSSCH with the same code rate adopted by the second SCI and the size of the sent TB as indicated by the first information.

[0185] The specific first PSSCH corresponds to at least a DMRS sequence known to the first terminal device (such as a pseudo-random sequence initialized by the ID of the first terminal device as a DMRS sequence), thereby ensuring that the first terminal device can still decode the PSSCH without decoding the first SCI.

[0186] Optionally, the first PSSCH and the first DMRS may belong to a mode 1 resource pool.

[0187] For example, the second terminal device may not send the first SCI, and each time-frequency resource indicated in the side configuration authorization may be used to send PSSCH; the DMRS of the PSSCH may be generated by a sequence generated by the ID corresponding to the first terminal device (such as a pseudo-random sequence initialized by the ID corresponding to the first terminal device).

[0188] Optionally, the first PSSCH and the first DMRS may belong to a mode 2 resource pool.

[0189] For example, if the first PSSCH and the first DMRS belong to the mode 2 resource pool, but the reference signal for channel sounding in the resource pool is the DMRS of the PSCCH (ie, the SL RSRP for channel sounding is measured using the DMRS of the PSCCH), the second terminal device needs to send the first SCI, then the time-frequency position occupied by the first DMRS sequence can be:

[0190] The time-frequency resource positions occupied by the DMRS of the PSSCH in the SL system are the same as those in the embodiments corresponding to Figures 3 to 5; or, the time domain resource positions occupied by the DMRS of the PSSCH in the SL system are the same as those in the embodiments corresponding to Figures 3 to 5, and the occupied RE positions are REs indexed as #1, #3, #5, #7, #9 and #11 in the PRB; or, the time-frequency resource positions occupied by the DMRS of the PSSCH in the SL system are different from those in the embodiments corresponding to Figures 3 to 5.

[0191] Optionally, the first PSSCH and the first DMRS may belong to a mode 2 resource pool.

[0192] For example, if the first PSSCH and the first DMRS belong to the mode 2 resource pool, and the reference signal for channel sensing in the resource pool is the DMRS of the PSSCH (that is, the SL RSRP for channel sensing is measured using the DMRS of the PSSCH), the second terminal device needs to send the first SCI. In order to avoid affecting the channel sensing, the second terminal device can additionally send the same PSSCH DMRS as the existing SL system at the time-frequency resource position occupied by the DMRS of the PSSCH in the existing SL system. The time-frequency position occupied by the first DMRS sequence can be:

[0193] The time domain resource positions occupied by the DMRS of the PSSCH in the SL system in the embodiments corresponding to Figures 3 to 5 are the same, and the occupied RE positions are REs indexed as #1, #3, #5, #7, #9 and #11 in the PRB; or, the time-frequency resource positions occupied by the DMRS of the PSSCH in the SL system in the embodiments corresponding to Figures 3 to 5 are different.

[0194] In the above embodiment, the first terminal device only receives a specific PSCCH and does not need to detect the first SCI in each time slot, which can reduce the power loss of the terminal device caused by detecting the SCI.

[0195] The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 16 , and the device embodiment of the present application is described in detail below in conjunction with Figures 17 to 23 . It should be understood that the description of the method embodiment corresponds to the description of the device embodiment, and therefore, for portions not described in detail, reference can be made to the above method embodiment.

[0196] FIG17 is a schematic structural diagram of a communication device provided in an embodiment of the present application. As shown in FIG17 , the device 1700 includes a receiving unit 1710, which is specifically as follows:

[0197] The receiving unit 1710 is configured to receive a first physical sidelink control channel PSCCH in a first time slot, where the first PSCCH is used to schedule a first physical sidelink shared channel PSSCH;

[0198] The receiving unit 1710 is configured to receive the first PSSCH in a second time slot according to the first PSCCH;

[0199] The interval between the first time slot and the second time slot is greater than or equal to X time slots, where X is a positive integer.

[0200] Optionally, the duration of the device decoding the PSCCH is less than or equal to X time slots.

[0201] Optionally, X is determined according to any one of the following ways: standard definition, network configuration, pre-configuration, and determination by the device.

[0202] Optionally, the first PSCCH is sent through a first resource, and the first resource occupies part of the orthogonal frequency division multiplexing OFDM symbol in the first time slot.

[0203] Optionally, the part of OFDM symbols is N OFDM symbols starting from the first time slot, or the part of OFDM symbols is N OFDM symbols ending at the first time slot, where N is a positive integer.

[0204] Optionally, the N is determined according to any of the following methods: standard definition, network configuration, and pre-configuration.

[0205] Optionally, the first resource occupies M physical resource blocks PRB or M interleaved resource blocks IRB within the portion of OFDM symbols, where M is a positive integer.

[0206] Optionally, the M is determined according to any of the following methods: standard definition, network configuration, and pre-configuration.

[0207] Optionally, the first resource belongs to a dedicated sidewalk resource pool or a dedicated sidewalk bandwidth portion BWP.

[0208] Optionally, the first resource occupies an OFDM symbol where a configured or pre-configured physical sidelink feedback channel PSFCH is located in the first time slot.

[0209] Optionally, part or all of the OFDM symbols where the PSFCH is located in the resource pool where the first time slot is located are used for the first resource.

[0210] FIG18 is a schematic structural diagram of a communication device provided in an embodiment of the present application. The communication device 1800 in FIG18 includes a sending unit 1810, which is specifically as follows:

[0211] The transmitting unit 1810 is configured to transmit a first physical sidelink control channel PSCCH in a first time slot, where the first PSCCH is used to schedule a first physical sidelink shared channel PSSCH;

[0212] The sending unit 1810 is configured to send the first PSSCH in a second time slot;

[0213] The interval between the first time slot and the second time slot is greater than or equal to X time slots, where X is a positive integer.

[0214] Optionally, the X is determined according to any of the following methods: standard definition, network configuration, pre-configuration, and determination by the first terminal device; wherein the first PSSCH is sent to the first terminal device.

[0215] Optionally, the first PSCCH is sent through a first resource, and the first resource occupies part of the orthogonal frequency division multiplexing OFDM symbol in the first time slot.

[0216] Optionally, the part of OFDM symbols is N OFDM symbols starting from the first time slot, or the part of OFDM symbols is N OFDM symbols ending at the first time slot, where N is a positive integer.

[0217] Optionally, the N is determined according to any of the following methods: standard definition, network configuration, and pre-configuration.

[0218] Optionally, the first resource occupies M physical resource blocks PRB or M interleaved resource blocks IRB within the portion of OFDM symbols, where M is a positive integer.

[0219] Optionally, the M is determined according to any of the following methods: standard definition, network configuration, and pre-configuration.

[0220] Optionally, the first resource belongs to a dedicated sidewalk resource pool or a dedicated sidewalk bandwidth portion BWP.

[0221] Optionally, the first resource occupies an OFDM symbol where a configured or pre-configured physical sidelink feedback channel PSFCH is located in the first time slot.

[0222] Optionally, part or all of the OFDM symbols where the PSFCH is located in the resource pool where the first time slot is located are used for the first resource.

[0223] Figure 19 is a schematic structural diagram of a communication device provided in an embodiment of the present application. The communication device 1900 in Figure 19 includes a detection unit 1910 and a determination unit 1920, which are specifically as follows:

[0224] The detection unit 1910 is configured to detect first sidelink control information SCI in a first time slot;

[0225] The determining unit 1920 is configured to determine whether to detect a second SCI in the first time slot according to the first SCI.

[0226] Optionally, the determining unit 1920 is specifically configured to determine whether to detect the second SCI in the first time slot according to a first field in the first SCI.

[0227] Optionally, the first field includes one or more bits in a reserved bit field.

[0228] Optionally, the first SCI is carried in a first physical sidelink control channel PSCCH, and the determining unit is specifically configured to determine whether to detect the second SCI in the first time slot according to a scrambling code sequence used by a demodulation reference signal DMRS of the first PSCCH.

[0229] Optionally, the determining unit 1920 is specifically configured to: if the DMRS of the first PSCCH adopts a first scrambling code sequence, determine to detect the second SCI in the first time slot.

[0230] Optionally, the first scrambling code sequence is determined according to any one of the following methods: standard definition, network configuration, pre-configuration, determination by the apparatus, and determination by the second terminal device; wherein the first SCI is sent by the second terminal device.

[0231] Optionally, the first SCI is a first-order SCI, and the second SCI is a second-order SCI.

[0232] Figure 20 is a schematic structural diagram of a communication device provided in an embodiment of the present application. The communication device 2000 in Figure 20 includes a sending unit 2010 and a determining unit 2020, as follows:

[0233] The sending unit 2010 is configured to send first sidelink control information SCI in a first time slot;

[0234] The determining unit 2020 is configured to determine whether to send a second SCI in the first time slot according to the first SCI.

[0235] Optionally, the determining unit 2020 is specifically configured to determine whether to send the second SCI in the first time slot according to a first field in the first SCI.

[0236] Optionally, the first field includes one or more bits in a reserved bit field.

[0237] Optionally, the first SCI is carried in a first physical sidelink control channel PSCCH, and the determining unit is specifically configured to determine whether to send the second SCI in the first time slot according to a scrambling code sequence used by a demodulation reference signal DMRS of the first PSCCH.

[0238] Optionally, the determining unit 2020 is specifically configured to: if the DMRS of the first PSCCH adopts a first scrambling code sequence, determine to send the second SCI in the first time slot.

[0239] Optionally, the first scrambling code sequence is determined according to any one of the following methods: standard definition, network configuration, pre-configuration, determination by the first terminal device, and determination by the apparatus; wherein the first SCI is sent to the first terminal device.

[0240] Optionally, the first SCI is a first-order SCI, and the second SCI is a second-order SCI.

[0241] Figure 21 is a schematic structural diagram of a communication device provided in an embodiment of the present application. The communication device 2100 in Figure 21 includes a receiving unit 2110 and a decoding unit 2120, as follows:

[0242] The receiving unit 2110 is configured to receive a first physical sidelink shared channel PSSCH according to the first information, where the first PSSCH corresponds to a first demodulation reference signal DMRS;

[0243] A decoding unit 2120 is configured to decode the first PSSCH according to the first DMRS;

[0244] Among them, the first information includes one or more of the following: the first DMRS, the time-frequency position of the first DMRS, the sidelink configuration authorization information, the size of the frequency domain resources occupied by the first PSSCH, the modulation and coding strategy MCS adopted by the first PSSCH, the sequence corresponding to the first demodulation reference signal DMRS, the time-frequency position of the first DMRS, the code rate adopted by the second-order sidelink control information SCI corresponding to the first PSSCH, and the size of the transmission block TB sent by the first PSSCH.

[0245] Optionally, the sequence corresponding to the first DMRS is a pseudo-random sequence obtained after initialization according to the identifier corresponding to the device.

[0246] Optionally, the first PSSCH and the first DMRS belong to a mode 1 resource pool or a mode 2 resource pool.

[0247] Optionally, the time-frequency position of the first DMRS includes resource elements RE indexed as #1, #3, #5, #7, #9 and #11 in a physical resource block PRB.

[0248] Optionally, the first information further includes resource reservation information indicated by the SCI previously received by the device, and the first PSSCH is used to carry retransmission data.

[0249] Optionally, the sideline configuration authorization information is the sideline configuration authorization configured by the second terminal device received by the apparatus.

[0250] Optionally, the sideline configuration authorization information is a sideline configuration authorization configured by the second terminal device received by the apparatus through a PC5 radio resource control RRC message or sideline control information SCI.

[0251] Optionally, the sideline configuration authorization information includes one or more of the following:

[0252] The configuration index of the side configuration authorization, the resource repetition period of the side configuration authorization, the number of hybrid automatic repeat requests HARQ of the side configuration authorization, the maximum number of transmission times of a transport block TB in the side configuration authorization, the time domain resources within a period of the side configuration authorization, the frequency domain resources within a period of the side configuration authorization, and the resource pool identifier where the side configuration authorization is located.

[0253] Figure 22 is a schematic structural diagram of a communication device provided in an embodiment of the present application. The communication device 2200 in Figure 22 includes a sending unit 2210, which is specifically as follows:

[0254] The sending unit 2210 is configured to send a first physical sidelink shared channel PSSCH according to the first information, where the first PSSCH corresponds to a first demodulation reference signal DMRS;

[0255] Among them, the first information includes one or more of the following: the first DMRS, the time-frequency position of the first DMRS, the sidelink configuration authorization information, the size of the frequency domain resources occupied by the first PSSCH, the modulation and coding strategy MCS adopted by the first PSSCH, the sequence corresponding to the first demodulation reference signal DMRS, the time-frequency position of the first DMRS, the code rate adopted by the second-order sidelink control information SCI corresponding to the first PSSCH, and the size of the transmission block TB sent by the first PSSCH.

[0256] Optionally, the sequence corresponding to the first DMRS is a pseudo-random sequence obtained after initialization according to the identifier corresponding to the first terminal device, and the first PSSCH is sent to the first terminal device.

[0257] Optionally, the first PSSCH and the first DMRS belong to a mode 1 resource pool or a mode 2 resource pool.

[0258] Optionally, the time-frequency position of the first DMRS includes resource elements RE indexed as #1, #3, #5, #7, #9 and #11 in a physical resource block PRB.

[0259] Optionally, the first information also includes resource reservation information indicated by the SCI previously sent by the device, and the first PSSCH is used to carry retransmission data.

[0260] Optionally, the sideline configuration authorization information is the sideline configuration authorization configured by the apparatus to the first terminal device.

[0261] Optionally, the sideline configuration authorization information is the sideline configuration authorization configured by the apparatus to the first terminal device via a PC5 radio resource control RRC message or sideline control information SCI.

[0262] Optionally, the sideline configuration authorization information includes one or more of the following:

[0263] The configuration index of the side configuration authorization, the resource repetition period of the side configuration authorization, the number of hybrid automatic repeat requests HARQ of the side configuration authorization, the maximum number of transmission times of a transport block TB in the side configuration authorization, the time domain resources within a period of the side configuration authorization, the frequency domain resources within a period of the side configuration authorization, and the resource pool identifier where the side configuration authorization is located.

[0264] Figure 23 is a schematic diagram of the structure of an apparatus provided in one embodiment of the present application. The dashed lines in Figure 23 indicate that the unit or module is optional. Apparatus 2300 may be used to implement the method described in the above method embodiment. Apparatus 2300 may be a chip or a communication device.

[0265] The device 2300 may include one or more processors 2310. The processor 2310 may support the device 2300 to implement the method described in the above method embodiment. The processor 2310 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0266] The apparatus 2300 may further include one or more memories 2320. The memories 2320 store programs that can be executed by the processor 2310, causing the processor 2310 to perform the methods described in the above method embodiments. The memories 2320 may be independent of the processor 2310 or integrated into the processor 2310.

[0267] The apparatus 2300 may further include a transceiver 2330. The processor 2310 may communicate with other devices or chips via the transceiver 2330. For example, the processor 2310 may transmit and receive data with other devices or chips via the transceiver 2330.

[0268] The present invention also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to the communication device provided in the present invention, and the program enables a computer to execute the method performed by the communication device in each embodiment of the present invention.

[0269] The present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to the communication device provided in the present application, and the program causes a computer to execute the method performed by the communication device in each embodiment of the present application.

[0270] The embodiments of the present application also provide a computer program. The computer program can be applied to the communication device provided in the embodiments of the present application, and the computer program enables a computer to execute the method performed by the communication device in each embodiment of the present application.

[0271] It should be understood that in the embodiments of the present application, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should also be understood that determining B based on A does not mean determining B based solely on A, but B can also be determined based on A and / or other information.

[0272] It should be understood that the term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0273] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0274] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0275] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0276] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0277] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can 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 can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0278] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A communication method, characterized in that: include: The first terminal device receives a first physical sideline control channel PSCCH in a first time slot, where the first PSCCH is used to schedule a first physical sideline shared channel PSSCH; The first terminal device receives the first PSSCH in the second time slot according to the first PSCCH; The interval between the first time slot and the second time slot is greater than or equal to X time slots, where X is a positive integer.

2. The method according to claim 1, characterized in that The duration of decoding the PSCCH by the first terminal device is less than or equal to X time slots.

3. The method according to claim 1 or 2, characterized in that: The X is determined according to any of the following methods: defined by a standard, configured by a network, pre-configured, and determined by the first terminal device.

4. The method according to any one of claims 1 to 3, characterized in that The first PSCCH is sent through a first resource, and the first resource occupies part of the orthogonal frequency division multiplexing OFDM symbols in the first time slot.

5. The method according to claim 4, characterized in that The part of OFDM symbols is the N OFDM symbols starting from the first time slot, or the part of OFDM symbols is the N OFDM symbols at the end of the first time slot, where N is a positive integer.

6. The method according to claim 5, characterized in that The N is determined according to any of the following methods: standard defined, network configured, and pre-configured.

7. The method according to any one of claims 4 to 6, characterized in that The first resource occupies M physical resource blocks PRB or M interleaved resource blocks IRB in the part of OFDM symbols, where M is a positive integer.

8. The method according to claim 7, characterized in that The M is determined according to any of the following methods: standard defined, network configured, and pre-configured.

9. The method according to any one of claims 4 to 8, characterized in that The first resource belongs to a dedicated sidewalk resource pool or a dedicated sidewalk partial bandwidth BWP.

10. The method according to any one of claims 4 to 9, characterized in that The first resource occupies an OFDM symbol where a configured or pre-configured physical sidelink feedback channel PSFCH is located in the first time slot.

11. The method according to claim 10, characterized in that The OFDM symbols where part or all of the PSFCHs in the resource pool where the first time slot is located are used for the first resource.

12. A communication method, characterized in that: include: The second terminal device sends a first physical sideline control channel PSCCH in the first time slot, where the first PSCCH is used to schedule a first physical sideline shared channel PSSCH; The second terminal device sends the first PSSCH in a second time slot; The interval between the first time slot and the second time slot is greater than or equal to X time slots, where X is a positive integer.

13. The method according to claim 12, characterized in that The X is determined according to any of the following methods: defined by a standard, configured by a network, pre-configured, and determined by the first terminal device; The first PSSCH is sent to the first terminal device.

14. The method according to claim 12 or 13, characterized in that The first PSCCH is sent through a first resource, and the first resource occupies part of the orthogonal frequency division multiplexing OFDM symbols in the first time slot.

15. The method according to claim 14, characterized in that The part of OFDM symbols is the N OFDM symbols starting from the first time slot, or the part of OFDM symbols is the N OFDM symbols at the end of the first time slot, where N is a positive integer.

16. The method according to claim 15, characterized in that The N is determined according to any of the following methods: standard defined, network configured, and pre-configured.

17. The method according to any one of claims 14 to 16, characterized in that The first resource occupies M physical resource blocks PRB or M interleaved resource blocks IRB in the part of OFDM symbols, where M is a positive integer.

18. The method according to claim 17, characterized in that The M is determined according to any of the following methods: standard defined, network configured, and pre-configured.

19. The method according to any one of claims 14 to 18, characterized in that The first resource belongs to a dedicated sidewalk resource pool or a dedicated sidewalk partial bandwidth BWP.

20. The method according to any one of claims 14 to 19, characterized in that The first resource occupies an OFDM symbol where a configured or pre-configured physical sidelink feedback channel PSFCH is located in the first time slot.

21. The method according to claim 20, characterized in that The OFDM symbols where part or all of the PSFCHs in the resource pool where the first time slot is located are used for the first resource.

22. A communication method, characterized in that: include: The first terminal device detects the first sideline control information SCI in the first time slot; The first terminal device determines whether to detect a second SCI in the first time slot according to the first SCI.

23. The method according to claim 22, characterized in that The first terminal device determines whether to detect a second SCI in the first time slot according to the first SCI, including: The first terminal device determines whether to detect the second SCI in the first time slot according to the first field in the first SCI.

24. The method according to claim 23, characterized in that The first field includes one or more bits in a reserved bit field.

25. The method according to claim 22, characterized in that The first SCI is carried in a first physical sidelink control channel PSCCH, and the first terminal device determines whether to detect the second SCI in the first time slot according to the first SCI, including: The first terminal device determines whether to detect the second SCI in the first time slot according to a scrambling code sequence used by a demodulation reference signal DMRS of the first PSCCH.

26. The method according to claim 25, characterized in that The first terminal device determines whether to detect the second SCI in the first time slot according to a scrambling code sequence used by the DMRS of the first PSCCH, including: If the DMRS of the first PSCCH adopts a first scrambling code sequence, the first terminal device determines to detect the second SCI in the first time slot.

27. The method according to claim 26, characterized in that The first scrambling code sequence is determined according to any of the following methods: defined by a standard, configured by a network, pre-configured, determined by the first terminal device, and determined by the second terminal device; The first SCI is sent by the second terminal device.

28. The method according to any one of claims 22 to 27, characterized in that The first SCI is a first-order SCI, and the second SCI is a second-order SCI.

29. A communication method, characterized in that: include: The second terminal device sends the first sideline control information SCI in the first time slot; The second terminal device determines whether to send a second SCI in the first time slot according to the first SCI.

30. The method according to claim 29, characterized in that The second terminal device determines whether to send a second SCI in the first time slot according to the first SCI, including: The second terminal device determines whether to send the second SCI in the first time slot according to the first field in the first SCI.

31. The method according to claim 30, characterized in that The first field includes one or more bits in a reserved bit field.

32. The method according to claim 29, characterized in that The first SCI is carried in a first physical sidelink control channel PSCCH, and the second terminal device determines whether to send a second SCI in the first time slot according to the first SCI, including: The second terminal device determines whether to send the second SCI in the first time slot according to the scrambling code sequence used by the demodulation reference signal DMRS of the first PSCCH.

33. The method according to claim 32, characterized in that The second terminal device determines whether to send the second SCI in the first time slot according to the scrambling code sequence used by the DMRS of the first PSCCH, including: If the DMRS of the first PSCCH adopts a first scrambling code sequence, the second terminal device determines to send the second SCI in the first time slot.

34. The method according to claim 33, characterized in that The first scrambling code sequence is determined according to any of the following methods: defined by a standard, configured by a network, pre-configured, determined by a first terminal device, and determined by the second terminal device; The first SCI is sent to the first terminal device.

35. The method according to any one of claims 29 to 34, characterized in that The first SCI is a first-order SCI, and the second SCI is a second-order SCI.

36. A communication method, characterized in that: include: The first terminal device receives a first physical sidelink shared channel PSSCH according to the first information, where the first PSSCH corresponds to a first demodulation reference signal DMRS; The first terminal device decodes the first PSSCH according to the first DMRS; Among them, the first information includes one or more of the following: the first DMRS, the time-frequency position of the first DMRS, the sideline configuration authorization information, the size of the frequency domain resources occupied by the first PSSCH, the modulation and coding strategy MCS adopted by the first PSSCH, the sequence corresponding to the first demodulation reference signal DMRS, the time-frequency position of the first DMRS, the code rate adopted by the second-order sideline control information SCI corresponding to the first PSSCH, and the size of the transmission block TB sent by the first PSSCH.

37. The method according to claim 36, characterized in that The sequence corresponding to the first DMRS is a pseudo-random sequence obtained after initialization according to the identifier corresponding to the first terminal device.

38. The method according to claim 36 or 37, characterized in that The first PSSCH and the first DMRS belong to a mode 1 resource pool or a mode 2 resource pool.

39. The method according to claim 38, characterized in that The time-frequency position of the first DMRS includes resource elements RE indexed as #1, #3, #5, #7, #9 and #11 in a physical resource block PRB.

40. The method according to any one of claims 36 to 39, characterized in that The first information also includes resource reservation information indicated by the SCI previously received by the first terminal device, and the first PSSCH is used to carry retransmission data.

41. The method according to any one of claims 36 to 39, characterized in that The sideline configuration authorization information is the sideline configuration authorization configured by the second terminal device and received by the first terminal device.

42. The method according to claim 41, characterized in that The sideline configuration authorization information is the sideline configuration authorization configured by the second terminal device received by the first terminal device through the PC5 radio resource control RRC message or the sideline control information SCI.

43. The method according to claim 41 or 42, characterized in that The sideline configuration authorization information includes one or more of the following: The configuration index of the side configuration authorization, the resource repetition period of the side configuration authorization, the number of hybrid automatic repeat request HARQ authorized by the side configuration, the maximum number of transmission times of a transmission block TB in the side configuration authorization, the time domain resources within a period of the side configuration authorization, the frequency domain resources within a period of the side configuration authorization, and the resource pool identifier where the side configuration authorization is located.

44. A communication method, characterized in that: include: The second terminal device sends a first physical sidelink shared channel PSSCH according to the first information, where the first PSSCH corresponds to a first demodulation reference signal DMRS; Among them, the first information includes one or more of the following: the first DMRS, the time-frequency position of the first DMRS, the sideline configuration authorization information, the size of the frequency domain resources occupied by the first PSSCH, the modulation and coding strategy MCS adopted by the first PSSCH, the sequence corresponding to the first demodulation reference signal DMRS, the time-frequency position of the first DMRS, the code rate adopted by the second-order sideline control information SCI corresponding to the first PSSCH, and the size of the transmission block TB sent by the first PSSCH.

45. The method according to claim 44, characterized in that The sequence corresponding to the first DMRS is a pseudo-random sequence obtained after initialization according to the identifier corresponding to the first terminal device, and the first PSSCH is sent to the first terminal device.

46. ​​The method according to claim 44 or 45, characterized in that The first PSSCH and the first DMRS belong to a mode 1 resource pool or a mode 2 resource pool.

47. The method according to claim 46, characterized in that The time-frequency position of the first DMRS includes resource elements RE indexed as #1, #3, #5, #7, #9 and #11 in a physical resource block PRB.

48. The method according to any one of claims 44 to 47, characterized in that The first information also includes resource reservation information indicated by the SCI previously sent by the second terminal device, and the first PSSCH is used to carry retransmission data.

49. The method according to any one of claims 44 to 47, characterized in that The sideline configuration authorization information is the sideline configuration authorization configured by the second terminal device to the first terminal device.

50. The method according to claim 49, characterized in that The sideline configuration authorization information is the sideline configuration authorization configured by the second terminal device to the first terminal device through a PC5 radio resource control RRC message or a sideline control information SCI.

51. The method according to claim 49 or 50, characterized in that The sideline configuration authorization information includes one or more of the following: The configuration index of the side configuration authorization, the resource repetition period of the side configuration authorization, the number of hybrid automatic repeat request HARQ authorized by the side configuration, the maximum number of transmission times of a transmission block TB in the side configuration authorization, the time domain resources within a period of the side configuration authorization, the frequency domain resources within a period of the side configuration authorization, and the resource pool identifier where the side configuration authorization is located.

52. A communication device, characterized in that: include: A receiving unit, configured to receive a first physical sideline control channel PSCCH in a first time slot, wherein the first PSCCH is used to schedule a first physical sideline shared channel PSSCH; The receiving unit is configured to receive the first PSSCH in a second time slot according to the first PSCCH; The interval between the first time slot and the second time slot is greater than or equal to X time slots, where X is a positive integer.

53. The device according to claim 52, characterized in that The duration of decoding the PSCCH by the apparatus is less than or equal to X time slots.

54. The device according to claim 52 or 53, characterized in that The X is determined according to any of the following ways: defined by a standard, configured by a network, pre-configured, and determined by the device.

55. The device according to any one of claims 52 to 54, characterized in that The first PSCCH is sent through a first resource, and the first resource occupies part of the orthogonal frequency division multiplexing OFDM symbols in the first time slot.

56. The device according to claim 55, characterized in that The part of OFDM symbols is the N OFDM symbols starting from the first time slot, or the part of OFDM symbols is the N OFDM symbols at the end of the first time slot, where N is a positive integer.

57. The device according to claim 56, characterized in that The N is determined according to any of the following methods: standard defined, network configured, and pre-configured.

58. The device according to any one of claims 55 to 57, characterized in that The first resource occupies M physical resource blocks PRB or M interleaved resource blocks IRB in the part of OFDM symbols, where M is a positive integer.

59. The device according to claim 58, characterized in that The M is determined according to any of the following methods: standard defined, network configured, and pre-configured.

60. The device according to any one of claims 55 to 59, characterized in that The first resource belongs to a dedicated sidewalk resource pool or a dedicated sidewalk partial bandwidth BWP.

61. The device according to any one of claims 55 to 60, characterized in that The first resource occupies an OFDM symbol where a configured or pre-configured physical sidelink feedback channel PSFCH is located in the first time slot.

62. The device according to claim 61, characterized in that The OFDM symbols where part or all of the PSFCHs in the resource pool where the first time slot is located are used for the first resource.

63. A communication device, characterized in that: include: A sending unit, configured to send a first physical sideline control channel PSCCH in a first time slot, wherein the first PSCCH is used to schedule a first physical sideline shared channel PSSCH; The sending unit is used to send the first PSSCH in a second time slot; The interval between the first time slot and the second time slot is greater than or equal to X time slots, where X is a positive integer.

64. The device according to claim 63, characterized in that The X is determined according to any of the following methods: defined by a standard, configured by a network, pre-configured, and determined by the first terminal device; The first PSSCH is sent to the first terminal device.

65. The device according to claim 63 or 64, characterized in that The first PSCCH is sent through a first resource, and the first resource occupies part of the orthogonal frequency division multiplexing OFDM symbols in the first time slot.

66. The device according to claim 65, characterized in that The part of OFDM symbols is the N OFDM symbols starting from the first time slot, or the part of OFDM symbols is the N OFDM symbols at the end of the first time slot, where N is a positive integer.

67. The device according to claim 66, characterized in that The N is determined according to any of the following methods: standard defined, network configured, and pre-configured.

68. The device according to any one of claims 65 to 67, characterized in that The first resource occupies M physical resource blocks PRB or M interleaved resource blocks IRB in the part of OFDM symbols, where M is a positive integer.

69. The device according to claim 68, characterized in that The M is determined according to any of the following methods: standard defined, network configured, and pre-configured.

70. The device according to any one of claims 65 to 69, characterized in that The first resource belongs to a dedicated sidewalk resource pool or a dedicated sidewalk partial bandwidth BWP.

71. The device according to any one of claims 65 to 70, characterized in that The first resource occupies an OFDM symbol where a configured or pre-configured physical sidelink feedback channel PSFCH is located in the first time slot.

72. The device according to claim 71, characterized in that The OFDM symbols where part or all of the PSFCHs in the resource pool where the first time slot is located are used for the first resource.

73. A communication device, characterized in that: include: A detection unit, configured to detect first sideline control information SCI in a first time slot; A determination unit is used to determine whether to detect a second SCI in the first time slot according to the first SCI.

74. The device according to claim 73, characterized in that The determining unit is specifically configured to determine whether to detect the second SCI in the first time slot according to a first field in the first SCI.

75. The device according to claim 74, characterized in that The first field includes one or more bits in a reserved bit field.

76. The device according to claim 73, characterized in that The first SCI is carried in a first physical sidelink control channel PSCCH, and the determination unit is specifically used to determine whether to detect the second SCI in the first time slot according to a scrambling code sequence used by a demodulation reference signal DMRS of the first PSCCH.

77. The device according to claim 76, characterized in that The determining unit is specifically configured to: if the DMRS of the first PSCCH adopts a first scrambling code sequence, determine to detect the second SCI in the first time slot.

78. The device according to claim 77, characterized in that The first scrambling code sequence is determined according to any one of the following methods: defined by a standard, configured by a network, pre-configured, determined by the apparatus, and determined by a second terminal device; wherein the first SCI is sent by the second terminal device.

79. The device according to any one of claims 73 to 78, characterized in that The first SCI is a first-order SCI, and the second SCI is a second-order SCI.

80. A communication device, characterized in that: include: A sending unit, configured to send first sideline control information SCI in a first time slot; A determining unit is used to determine whether to send a second SCI in the first time slot according to the first SCI.

81. The device according to claim 80, characterized in that The determining unit is specifically configured to determine whether to send the second SCI in the first time slot according to a first field in the first SCI.

82. The device according to claim 81, characterized in that The first field includes one or more bits in a reserved bit field.

83. The device according to claim 80, characterized in that The first SCI is carried in a first physical sidelink control channel PSCCH, and the determination unit is specifically used to determine whether to send the second SCI in the first time slot according to a scrambling code sequence used by a demodulation reference signal DMRS of the first PSCCH.

84. The device according to claim 83, characterized in that The determining unit is specifically configured to: if the DMRS of the first PSCCH adopts a first scrambling code sequence, determine to send the second SCI in the first time slot.

85. The device according to claim 84, characterized in that The first scrambling code sequence is determined according to any one of the following methods: defined by a standard, configured by a network, pre-configured, determined by a first terminal device, and determined by the apparatus; wherein the first SCI is sent to the first terminal device.

86. The device according to any one of claims 80 to 85, characterized in that The first SCI is a first-order SCI, and the second SCI is a second-order SCI.

87. A communication device, characterized in that: include: A receiving unit, configured to receive a first physical sidelink shared channel PSSCH according to first information, where the first PSSCH corresponds to a first demodulation reference signal DMRS; A decoding unit, configured to decode the first PSSCH according to the first DMRS; Among them, the first information includes one or more of the following: the first DMRS, the time-frequency position of the first DMRS, the sideline configuration authorization information, the size of the frequency domain resources occupied by the first PSSCH, the modulation and coding strategy MCS adopted by the first PSSCH, the sequence corresponding to the first demodulation reference signal DMRS, the time-frequency position of the first DMRS, the code rate adopted by the second-order sideline control information SCI corresponding to the first PSSCH, and the size of the transmission block TB sent by the first PSSCH.

88. The device according to claim 87, characterized in that The sequence corresponding to the first DMRS is a pseudo-random sequence obtained after initialization according to the identifier corresponding to the device.

89. The device according to claim 87 or 88, characterized in that The first PSSCH and the first DMRS belong to a mode 1 resource pool or a mode 2 resource pool.

90. The device according to claim 89, characterized in that The time-frequency position of the first DMRS includes resource elements RE indexed as #1, #3, #5, #7, #9 and #11 in a physical resource block PRB.

91. The device according to any one of claims 87 to 90, characterized in that The first information also includes resource reservation information indicated by the SCI previously received by the device, and the first PSSCH is used to carry retransmission data.

92. The device according to any one of claims 87 to 90, characterized in that The sideline configuration authorization information is the sideline configuration authorization configured by the second terminal device received by the apparatus.

93. The device according to claim 92, characterized in that The sideline configuration authorization information is the sideline configuration authorization configured by the second terminal device received by the device through the PC5 radio resource control RRC message or the sideline control information SCI.

94. The device according to claim 92 or 93, characterized in that The sideline configuration authorization information includes one or more of the following: The configuration index of the side configuration authorization, the resource repetition period of the side configuration authorization, the number of hybrid automatic repeat request HARQ authorized by the side configuration, the maximum number of transmission times of a transmission block TB in the side configuration authorization, the time domain resources within a period of the side configuration authorization, the frequency domain resources within a period of the side configuration authorization, and the resource pool identifier where the side configuration authorization is located.

95. A communication device, characterized in that: include: A sending unit, configured to send a first physical sidelink shared channel PSSCH according to first information, where the first PSSCH corresponds to a first demodulation reference signal DMRS; Among them, the first information includes one or more of the following: the first DMRS, the time-frequency position of the first DMRS, the sideline configuration authorization information, the size of the frequency domain resources occupied by the first PSSCH, the modulation and coding strategy MCS adopted by the first PSSCH, the sequence corresponding to the first demodulation reference signal DMRS, the time-frequency position of the first DMRS, the code rate adopted by the second-order sideline control information SCI corresponding to the first PSSCH, and the size of the transmission block TB sent by the first PSSCH.

96. The device according to claim 95, characterized in that The sequence corresponding to the first DMRS is a pseudo-random sequence obtained after initialization according to the identifier corresponding to the first terminal device, and the first PSSCH is sent to the first terminal device.

97. The device according to claim 95 or 96, characterized in that The first PSSCH and the first DMRS belong to a mode 1 resource pool or a mode 2 resource pool.

98. The device according to claim 97, characterized in that The time-frequency position of the first DMRS includes resource elements RE indexed as #1, #3, #5, #7, #9 and #11 in a physical resource block PRB.

99. The device according to any one of claims 95 to 98, characterized in that The first information also includes resource reservation information indicated by the SCI previously sent by the device, and the first PSSCH is used to carry retransmission data.

100. The device according to any one of claims 95 to 98, characterized in that The sideline configuration authorization information is the sideline configuration authorization configured by the apparatus to the first terminal device.

101. The device according to claim 100, characterized in that The sideline configuration authorization information is the sideline configuration authorization configured by the apparatus to the first terminal device through a PC5 radio resource control RRC message or a sideline control information SCI.

102. The device according to claim 100 or 101, characterized in that The sideline configuration authorization information includes one or more of the following: The configuration index of the side configuration authorization, the resource repetition period of the side configuration authorization, the number of hybrid automatic repeat request HARQ authorized by the side configuration, the maximum number of transmission times of a transmission block TB in the side configuration authorization, the time domain resources within a period of the side configuration authorization, the frequency domain resources within a period of the side configuration authorization, and the resource pool identifier where the side configuration authorization is located.

103. A communication device, characterized in that: It includes a memory, a transceiver and a processor, the memory is used to store programs, the processor sends and receives data through the transceiver, and the processor is used to call the program in the memory so that the communication device executes the method as described in any one of claims 1 to 51.

104. A communication device, characterized in that: It comprises a processor, which is used to call a program from a memory so that the communication device executes the method as claimed in any one of claims 1 to 51.

105. A chip, characterized in that: It comprises a processor, which is used to call a program from a memory so that a device equipped with the chip executes a method as claimed in any one of claims 1 to 51.

106. A computer-readable storage medium, characterized in that A program is stored thereon, the program causing a computer to execute the method according to any one of claims 1 to 51.

107. A computer program product, characterized in that A program is included, which causes a computer to execute the method as claimed in any one of claims 1 to 51.

108. A computer program, characterized in that The computer program causes a computer to execute the method according to any one of claims 1 to 51.

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