Method, terminal device and system for sending and receiving side control information

Abstract

The present application provides a method, terminal device and system for sending and receiving side traffic control information, which can be applied to the fields of vehicle networking (for example, V2X, LTE‑V or V2V, etc.), intelligent driving and intelligent connected vehicles. In a scenario where the second-level SCI is not required in the side traffic communication system, the transmitting device of the side traffic communication instructs the transmitting device not to send the second-level SCI to the receiving device through the first-level SCI, or the cyclic redundancy check bit of the first-level SCI, or the reference signal for demodulating the first-level SCI. Thus, the transmitting device can flexibly choose to use two-level SCI or one-level SCI according to the specific scenario of the side traffic communication. It can avoid the waste of resources caused by the use of two-level SCI in any scenario of side traffic communication, thereby improving the efficiency of resource utilization.

Description

Technical Field

[0001] The present application relates to the field of vehicle networking, and more specifically, to a method and terminal device for sending side travel control information, and a method, terminal device and system for receiving side travel control information. Background Art

[0002] Vehicle to everything (V2X) communication refers to the communication between vehicles and anything in the outside world, such as communication between vehicles, vehicles and pedestrians, vehicles and infrastructure, vehicles and networks, etc. Vehicle-user equipment (V-UE) can send some of its own information, such as location, speed, intention (turning, merging or reversing, etc.) to surrounding V-UEs. At the same time, V-UEs will also receive information from surrounding V-UEs to complete communication between V-UEs, which is also called sidelink communication.

[0003] In the downlink transmission between the terminal device and the base station, the downlink control information (DCI) sent by the base station to the terminal device is carried by the physical downlink control channel (PDCCH). PDCCH is resource mapped in units of control channel elements (CCE). The number of CCEs that a PDCCH consists of depends on the size of the DCI carried by the PDCCH and the code rate. Among them, the number of CCEs contained in a PDCCH is defined as the aggregation level (AL). The terminal device decodes the PDCCH by blind decoding (BD) in units of CCE to obtain the DCI.

[0004] Similar to downlink communication, V2X communication also introduces the physical sidelink control channel (PSCCH) and the physical sidelink shared channel (PSSCH). PSCCH is used to carry sidelink control information (SCI), and SCI is used to schedule PSSCH, so that sidelink communication can be carried out between V-UEs.

[0005] Different from DCI, in view of the characteristics of sidewalk communication itself, the 3rd generation partnership project (3GPP) standard organization proposed to adopt a two-stage SCI (i.e., 2-stage SCI) solution in sidewalk communication systems such as V2X, that is, the transmitting device generates the first-stage SCI, the first-stage SCI indicates the second-stage SCI, and the first-stage and second-stage SCI together constitute the complete sidewalk control information.

[0006] However, in sideline communications, due to the existence of physical layer unicast, multicast, broadcast and various transmission modes, such as the mode based on network device scheduling, the mode in which the terminal device autonomously selects resources, etc., the two-level SCI solution may not be applicable to all situations. If the two-level SCI is used in all situations, it may lead to a waste of resources. Summary of the invention

[0007] The present application provides a method and a terminal device for sending and receiving sidewalk control information, which can improve the resource utilization efficiency in sidewalk communications.

[0008] In a first aspect, the present application provides a method for sending side control information, the method comprising: a first terminal device sends first-level side control information SCI to a second terminal device, the first-level SCI includes first indication information, and the first indication information is used to indicate whether the first terminal device sends second-level side control information SCI to the second terminal device;

[0009] The first indication information indicates that the first terminal device does not send second-level sidelink control information SCI to the second terminal device, and the first terminal device sends a physical sidelink shared channel PSSCH to the second terminal device according to the first-level SCI, or

[0010] The first indication information instructs the first terminal device to send second-level sidelink control information SCI to the second terminal device, and the first terminal device sends a physical sidelink shared channel PSSCH to the second terminal device according to the first-level SCI and the second-level SCI.

[0011] The technical solution provided by the present application is that in a scenario where the second-level SCI is not needed in the sideline communication system, the transmitting end device (that is, the first terminal device) of the sideline communication instructs the transmitting end device not to send the second-level SCI to the receiving end device (that is, the second terminal device) through the first-level SCI, or the cyclic redundancy check bit of the first-level SCI, or the reference signal used to demodulate the first-level SCI. Therefore, according to the specific scenario of the sideline communication, the transmitting end device can flexibly choose to use two-level SCI or one-level SCI. In the case where the transmitting end device does not send the second-level SCI, the transmitting end device can use the resources corresponding to the second-level SCI for data transmission, etc., which can avoid the waste of resources caused by uniformly using two-level SCI in any scenario of the sideline communication.

[0012] In addition, the spectrum efficiency of the sideline communication system can also be improved.

[0013] Alternatively, the transmitting end device of the sideline communication does not send the second level SCI to the receiving end device, which means that the second level SCI does not exist. In other words, the transmitting end device of the sideline communication only uses the first level SCI to schedule the PSSCH.

[0014] In combination with the first aspect, in some implementations of the first aspect, the first indication information is used to indicate whether the first terminal device sends second-level side control information SCI to the second terminal device, including:

[0015] The first-level SCI includes an aggregation level AL field, the AL field has at least two valid values, the at least two valid values ​​include a first valid value, the first valid value is 0, and 0 is used to indicate that the first terminal device does not send the second-level SCI to the second terminal device; and

[0016] The other valid values ​​of the at least two valid values ​​except the first valid value are used to instruct the first terminal device to send the second level SCI to the second terminal device, and any one of the other valid values ​​is specifically used to indicate the aggregation level of the second level SCI.

[0017] Considering the existing scenario of using two-level SCI, the AL of the second-level SCI indicated by the AL field of the first-level SCI does not include the case of AL = 0. Therefore, using the effective value "0" of the AL field of the first-level SCI to indicate that the AL of the second-level SCI is 0, implicitly indicates that the first terminal device does not send the second-level SCI to the second terminal device, and does not increase the overhead of signaling or indication resources.

[0018] In combination with the first aspect, in some implementations of the first aspect, the first indication information is used to indicate whether the first terminal device sends second-level side control information SCI to the second terminal device, including:

[0019] The first indication information has at least two valid values, and a first valid value among the at least two valid values ​​is used to instruct the first terminal device not to send the second level SCI to the second terminal device;

[0020] The second valid value of the at least two valid values ​​is used to indicate that the first terminal device sends the second level SCI to the second terminal device, and the first level SCI also includes an aggregation level AL field, and the valid value of the AL field is used to indicate the aggregation level of the second level SCI.

[0021] In a scenario where the second-level SCI is not required, the first terminal device carries the first indication information in the first-level SCI to indicate to the second terminal device that the first terminal device does not send the second-level SCI to the second terminal device. This allows the mandatory two-level SCI scheme to be flexibly removed based on the side communication scenario, thereby avoiding waste of resources and improving the spectrum efficiency of the side communication system.

[0022] In combination with the first aspect, in certain implementations of the first aspect, the first indication information instructs the first terminal device not to send second-level sidelink control information SCI to the second terminal device, and the first terminal device sends a physical sidelink shared channel PSSCH to the second terminal device according to the first-level SCI, wherein the transmission type of the PSSCH is broadcast.

[0023] In a scenario where the second-level SCI is not needed, for example, side broadcast transmission, the first terminal device does not send the second-level SCI to the second terminal device, thereby using the resources used to send the second-level SCI for other purposes, such as data transmission, thereby avoiding waste of resources and improving the spectrum efficiency of the side communication system.

[0024] In a second aspect, the present application provides a method for sending side control information, the method comprising: a first terminal device sends first-level side control information SCI to a second terminal device, and a cyclic redundancy check bit corresponding to the first-level SCI is scrambled by scrambling information, wherein the scrambling information includes a first identifier or a second identifier, the first identifier is used to indicate that the first terminal device does not send a second-level SCI to the second terminal device, and the second identifier is used to indicate that the first terminal device sends a second-level SCI to the second terminal device;

[0025] The scrambling information includes a first identifier, and the first terminal device sends a physical sidelink shared channel PSSCH to the second terminal device according to the first level SCI, or

[0026] The scrambling information includes a second identifier, and the first terminal device sends a physical sidelink shared channel PSSCH to the second terminal device according to the first level SCI and the second level SCI.

[0027] The first terminal device scrambles the CRC of the first-level SCI by using different identifiers to implicitly indicate to the second terminal device whether the first terminal device sends the second-level SCI to the second terminal device. This allows the first terminal device to indicate to the second terminal device whether the first terminal device sends the second-level SCI without changing the structure of the first-level SCI, and does not incur any overhead in signaling or indication resources.

[0028] In combination with the second aspect, in certain implementations of the second aspect, the scrambling information includes a first identifier, the first terminal device sends the PSSCH to the second terminal device according to the first-level SCI, and the transmission type of the PSSCH is broadcast.

[0029] In a third aspect, the present application provides a method for sending side control information, the method comprising: a first terminal device sending first level side control information SCI to a second terminal device;

[0030] The first terminal device sends a reference signal to the second terminal device, wherein the reference signal includes a first reference signal or a second reference signal, wherein the first reference signal is used to instruct the first terminal device not to send a second-level SCI to the second terminal device, and the second reference signal is used to instruct the first terminal device to send a second-level SCI to the second terminal device;

[0031] The reference signal includes a first reference signal, and the first terminal device sends a physical sidelink shared channel PSSCH to the second terminal device according to the first level SCI;

[0032] The reference signal includes a second reference signal, and the first terminal device sends the PSSCH to the terminal device according to the first level SCI and the second level SCI.

[0033] The first terminal device uses different reference signals for the second terminal device to perform channel estimation on the PSCCH carrying the first-level SCI to decode the first-level SCI, and can implicitly indicate to the second terminal device whether the first terminal device sends the second-level SCI to the second terminal device. The first terminal device can indicate to the second terminal device whether the first terminal device sends the second-level SCI without changing the structure of the first-level SCI, and will not incur the overhead of signaling or indication resources.

[0034] Optionally, in combination with the third aspect, in certain implementations of the third aspect, the reference signal includes the first reference signal, and the first terminal device sends the PSSCH to the second terminal device according to the first level SCI, wherein the transmission type of the PSSCH is broadcast.

[0035] Optionally, in combination with the third aspect, in certain implementations of the third aspect, the reference signal includes a demodulation reference signal DMRS for demodulating a sidelink physical control channel PSCCH carrying the first level SCI, the first reference signal is a first DMRS, and the second reference signal is a second DMRS.

[0036] The existing DMRS for channel estimation of the PSCCH carrying the first-level SCI is used to implicitly indicate whether the first terminal device sends the second-level SCI to the second terminal device, without incurring signaling or indication resource overhead.

[0037] It should be noted that the methods for sending side control information in the following fourth to sixth aspects are methods executed by a receiving end device of side communication. The beneficial technical effects that can be achieved by each technical scheme thereof can be referred to the description of the corresponding schemes in the first to third aspects and will not be repeated here.

[0038] In a fourth aspect, the present application provides a method for receiving side control information, the method comprising: a second terminal device receiving a first-level SCI from a first terminal device, the first-level SCI comprising first indication information, the first indication information being used to indicate whether the first terminal device sends a second-level SCI to the second terminal device;

[0039] The first indication information indicates that the first terminal device does not send the second-level SCI to the second terminal device, and the second terminal device receives a physical sidelink shared channel PSSCH from the first terminal device according to the first-level SCI;

[0040] The first indication information instructs the first terminal device to send the second-level SCI to the second terminal device, and the second terminal device receives the PSSCH from the first terminal device according to the first-level SCI and the second-level SCI.

[0041] In combination with the third aspect, in some implementations of the third aspect, the first indication information is used to indicate whether the first terminal device sends second-level side control information SCI to the second terminal device, including:

[0042] The first-level SCI includes an aggregation level AL field, the AL field has at least two valid values, the at least two valid values ​​include a first valid value, the first valid value is 0, and 0 is used to indicate that the first terminal device does not send the second-level SCI to the second terminal device; and

[0043] The other valid values ​​of the at least two valid values ​​except the first valid value are used to instruct the first terminal device to send the second level SCI to the second terminal device, and any one of the other valid values ​​is specifically used to indicate the aggregation level of the second level SCI.

[0044] In combination with the third aspect, in some implementations of the third aspect, the first indication information is used to indicate whether the first terminal device sends second-level side control information SCI to the second terminal device, including:

[0045] The first indication information has at least two valid values, and a first valid value among the at least two valid values ​​is used to instruct the first terminal device not to send the second level SCI to the second terminal device;

[0046] The second valid value of the at least two valid values ​​is used to indicate that the first terminal device sends the second level SCI to the second terminal device, and the first level SCI also includes an aggregation level AL field, and the valid value of the AL field is used to indicate the aggregation level of the second level SCI.

[0047] In combination with the fourth aspect, in certain implementations of the fourth aspect, the first indication information instructs the first terminal device not to send a second-level SCI to the second terminal device, and the second terminal device receives a PSSCH from the first terminal device according to the first-level SCI, wherein the transmission type of the PSSCH is broadcast.

[0048] In a fifth aspect, the present application provides a method for receiving side control information, the method comprising: a second terminal device receives first-level side control information SCI from a first terminal device, a cyclic redundancy check bit corresponding to the first-level SCI is scrambled by scrambling information, wherein the scrambling information includes a first identifier or a second identifier, the first identifier is used to indicate that the first terminal device does not send the second-level SCI to the second terminal device, and the second identifier is used to indicate that the first terminal device sends the second-level SCI to the second terminal device;

[0049] The scrambling information includes a first identifier, and the second terminal device receives the PSSCH from the first terminal device according to the first level SCI; or,

[0050] The scrambling information includes a second identifier, and the second terminal device receives the PSSCH from the first terminal device according to the first level SCI and the second level SCI.

[0051] In combination with the fifth aspect, in certain implementations of the fifth aspect, the scrambling information includes a first identifier, and the second terminal device receives the PSSCH from the first terminal device according to the first-level SCI, wherein the transmission type of the PSSCH is broadcast.

[0052] In a sixth aspect, the present application provides a method for receiving sideline control information, the method comprising: a second terminal device receiving first-level sideline control information SCI from a first terminal device;

[0053] The second terminal device detects a reference signal from the first terminal device, wherein the reference signal includes a first reference signal or a second reference signal, wherein the first reference signal is used to instruct the first terminal device not to send a second level SCI to the second terminal device, and the second reference signal is used to instruct the first terminal device to send a second level SCI to the second terminal device;

[0054] The reference signal includes the first reference signal, and the second terminal device receives a physical sidelink shared channel PSSCH from the first terminal device according to the first level SCI; or,

[0055] The reference signal includes the second reference signal, and the second terminal device receives the PSSCH from the first terminal device according to the first level SCI and the second level SCI.

[0056] In combination with the sixth aspect, in certain implementations of the sixth aspect, the reference signal includes the first reference signal, the second terminal device receives the PSSCH from the second terminal device according to the first-level SCI, and the transmission type of the PSSCH is broadcast.

[0057] In combination with the sixth aspect, in certain implementations of the sixth aspect, the reference signal includes a demodulation reference signal DMRS for demodulating a sidelink physical control channel PSCCH carrying the first level SCI, the first reference signal is a first DMRS, and the second reference signal is a second DMRS.

[0058] In a seventh aspect, the present application provides a terminal device, which has the function of implementing the method in the first aspect or any possible implementation thereof, or the function of implementing the method in the second aspect or any possible implementation thereof, or the function of implementing the method in the third aspect or any possible implementation thereof. The function can be implemented by hardware, or by hardware executing corresponding software implementation. The hardware or software includes one or more units corresponding to the above functions.

[0059] In an eighth aspect, the present application provides a terminal device, the terminal device having the function of implementing the method in the fourth aspect or any possible implementation thereof, or the function of implementing the method in the fifth aspect or any possible implementation thereof, or the function of implementing the method in the sixth aspect or any possible implementation thereof. The function may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

[0060] In a ninth aspect, the present application provides a terminal device, including a processor, a memory, and a transceiver. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory, and control the transceiver to send and receive signals, so that the terminal device executes the method in the first aspect or any possible implementation thereof, or executes the method in the second aspect or any possible implementation thereof, or executes the method in the third aspect or any possible implementation thereof.

[0061] In a tenth aspect, the present application provides a terminal device, including a processor, a memory, and a transceiver. The memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory, and control the transceiver to send and receive signals, so that the terminal device executes the method in the fourth aspect or any possible implementation thereof, or executes the method in the fifth aspect or any possible implementation thereof, or executes the method in the sixth aspect or any possible implementation thereof.

[0062] In an eleventh aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, which, when executed on a computer, cause the computer to execute the method in the first aspect or any possible implementation thereof, or execute the method in the second aspect or any possible implementation thereof, or execute the method in the third aspect or any possible implementation thereof.

[0063] In the twelfth aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions. When the computer instructions are executed on a computer, the computer executes the method in the fourth aspect or any possible implementation thereof, or executes the method in the fifth aspect or any possible implementation thereof, or executes the method in the sixth aspect or any possible implementation thereof.

[0064] In a thirteenth aspect, the present application provides a computer program product, comprising a computer program code, which, when executed on a computer, enables the computer to execute the method in the first aspect or any possible implementation thereof, or execute the method in the second aspect or any possible implementation thereof, or execute the method in the third aspect or any possible implementation thereof.

[0065] In a fourteenth aspect, the present application provides a computer program product, comprising a computer program code, which, when executed on a computer, enables the computer to execute the method in the fourth aspect or any possible implementation thereof, or execute the method in the fifth aspect or any possible implementation thereof, or execute the method in the sixth aspect or any possible implementation thereof.

[0066] In a fifteenth aspect, the present application provides a terminal device comprising a processor and an interface circuit, wherein the interface circuit is used to receive computer code or instructions and transmit them to the processor, and the processor is used to run the computer code or instructions to execute the method in the first aspect or any possible implementation thereof, or execute the method in the second aspect or any possible implementation thereof, or execute the method in the third aspect or any possible implementation thereof.

[0067] In the sixteenth aspect, the present application provides a terminal device, comprising a processor and an interface circuit, wherein the interface circuit is used to receive computer code or instructions and transmit them to the processor, and the processor is used to run the computer code or instructions to execute the method in the fourth aspect or any possible implementation thereof, or execute the method in the fifth aspect or any possible implementation thereof, or execute the method in the sixth aspect or any possible implementation thereof.

[0068] In the seventeenth aspect, the present application provides a side communication system, comprising the terminal device as described in the ninth aspect and / or the terminal device as described in the tenth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 It is a schematic diagram of the V2X communication scenario.

[0070] Figure 2 A flowchart of a method 200 for sending sideline control information provided in the present application.

[0071] Figure 3 Flow chart of the method 300 for sending side line control information provided in the present application.

[0072] Figure 4 Flow chart of the method 400 for sending side line control information provided in the present application.

[0073] Figure 5 This is a schematic block diagram of a terminal device 1000 provided in this application.

[0074] Figure 6 This is a schematic block diagram of a terminal device 2000 provided in this application.

[0075] Figure 7 It is a schematic structural diagram of the terminal device 10 provided in this application.

[0076] Figure 8 It is a schematic structural diagram of the terminal device 20 provided in this application. DETAILED DESCRIPTION

[0077] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0078] The technical solution of the present application can be applied to any network where terminal devices and terminal devices (device to device, D2D) directly communicate, such as vehicle-to-everything (V2X), V2V, V2I, V2P, V2N, intelligent connected vehicle (ICV), autonomous driving or assisted driving, and other communication systems. In addition, it is applicable to communication scenarios with and without network coverage.

[0079] See also Figure 1 , Figure 1It is a schematic diagram of the V2X communication scenario. In V2X communication, the link between vehicle-user equipment (V-UE) and vehicle-user equipment, pedestrian-user equipment and vehicle-user equipment, and roadside unit (RSU) equipment is called sidelink (SL), and the link between vehicle-user equipment and network equipment is called downlink (DL) or uplink (UL), and its air interface is also called Uu air interface. The corresponding DL communication and UL communication are also called Uu communication.

[0080] In V2X communication, both parties in communication are terminal devices.

[0081] The terminal equipment mentioned in this application may also be referred to as a terminal device, including but not limited to user equipment (UE), wireless terminal equipment, mobile terminal equipment, device-to-device (D2D) terminal equipment, V2X terminal equipment, machine-type communications (M2M / MTC) terminal equipment, Internet of Things (IoT) terminal equipment, user terminal, user agent, or user equipment, etc. For example, it may include a mobile phone (or "cellular" phone), a computer with a mobile terminal device, such as a portable, pocket-sized, handheld, or computer-built-in mobile device, etc. For another example, a personal communication service (PCS) phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), and other devices. In addition, the terminal equipment may also be a vehicle-mounted communication module or other embedded communication module. The vehicle-mounted communication module may also be referred to as a vehicle-mounted terminal device or an on-board unit (OBU). The terminal device of the embodiment of the present application may also be an on-board module, an on-board module, an on-board component, an on-board chip or an on-board unit built into the vehicle as one or more components or units. The vehicle may implement the method of the present application through the built-in on-board module, on-board module, on-board component, on-board chip or on-board unit.

[0082] The network devices mentioned in the present application, for example, include access network (AN) devices, such as base stations (e.g., access points), which may refer to devices in the access network that communicate with wireless terminal devices through one or more cells at the air interface, or, for example, a network device in a vehicle-to-everything (V2X) technology is a road side unit (RSU). The base station can be used to convert received air frames to and from IP packets, as a router between the terminal device and the rest of the access network, where the rest of the access network may include an IP network. The RSU can be a fixed infrastructure entity that supports V2X applications and can exchange messages with other entities that support V2X applications. The network device can also coordinate the attribute management of the air interface. For example, the network device may include an evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in a long term evolution (LTE) system or an advanced long term evolution (LTE-A), or may also include the fifth generation mobile communication technology (the 5 th The next generation node B (gNB) in the new radio (NR) system (also referred to as the NR system) of the 5G generation) may also include a centralized unit (CU) and a distributed unit (DU) in the cloud radio access network (CloudRAN) system, but the embodiments of the present application are not limited thereto.

[0083] Of course, network equipment can also include core network equipment, but because the technical solution provided in the embodiment of the present application mainly involves access network equipment, in the following text, unless otherwise specified, the "core network equipment" described refers to the core network equipment, and the "network equipment" or "access network equipment" described refers to the access network equipment.

[0084] The following is a brief introduction to the two levels of SCI involved in this application.

[0085] In the sideline communication, the transmitting end device sends the sideline scheduling information to schedule the receiving end device to receive data information. The sideline scheduling information is SCI. According to the protocol standard proposed by 3GPP, the SCI in the sideline communication system can be divided into two levels, namely, the first level SCI (1 st -stage SCI and second-stage SCI (2 ndOf course, SCI may also include more than two-stage SCI.

[0086] The first-level SCI is carried on a physical sidelink control channel (PSCCH). The first-level SCI contains sidelink control information for decoding the PSSCH. For example, the first-level SCI may include one or more of the following fields:

[0087] The priority field of the scheduled physical sidelink shared channel (PSSCH) is used to indicate the priority information of the PSSCH and can be 3 bits or 4 bits in length;

[0088] The field of scheduling information of the time-frequency resources of the PSSCH may be 8 bits or 9 bits in length;

[0089] Resource reservation information field for retransmitted PSSCH, for example, the time interval between different retransmitted PSSCHs, which may be 4 bits or 5 bits in length);

[0090] The sequence number field used for PSSCH retransmission can indicate how many times the current PSSCH is retransmitted and can be 2 bits long);

[0091] The resource reservation information field for the newly transmitted PSSCH, for example, resource reservation for periodic services, may be 4 or 5 bits in length);

[0092] The modulation and coding scheme (MCS) field of PSSCH may be 5 bits in length);

[0093] The PSSCH demodulation reference signal (DMRS) pattern indication information field (can be 2 or 3 bits in length);

[0094] The format indication information of the second-level SCI can indicate whether the content contained in the second-level SCI includes the location information of the transmitting device, the required information of the communication range of receiving PSSCH, etc., that is, whether the HARQ feedback mode of PSSCH is a mode of only feeding back NACK based on the communication distance between the transmitting and receiving ends, or a mode of feeding back ACK and / or NACK. Indirectly, it can also be used to distinguish unicast transmission or multicast transmission with group establishment and maintenance, or multicast transmission without group establishment and maintenance, which can be 1 bit); and,

[0095] The resource pool identity field is used to distinguish different resource pools and can be 4 bits or 5 bits in length, where the resource pool is a collection of available time-frequency resources for sideline communication between a transmitting device and a receiving device.

[0096] In addition, the first-level SCI may also include a resource indication information field for the second-level SCI. The resource indication information field may be, for example, an AL field (which may be 3 or 4 bits in length). The AL field is used to indicate the AL of the second-level SCI, that is, the number of basic resource units used to transmit the second-level SCI that the resources of the second-level SCI are aggregated from.

[0097] The second-level SCI includes other sideline control information required for decoding the PSSCH in addition to the sideline control information included in the first-level SCI.

[0098] For example, the second level SCI may include one or more of the following fields:

[0099] The HARQ activation information field indicates whether the receiving device needs to feed back HARQ-ACK information (e.g., ACK or NACK) to the transmitting device on the physical sidelink feedback channel (PSFCH). The HARQ activation information field may contain 1 bit of information, in which one valid value, such as "1", is used to indicate unicast transmission and / or multicast transmission. That is, it is not based on the multicast mode of transmitting device-receiving device transmission distance feedback HARQ (Tx-Rx distance-based HARQ), that is, the receiving device of the multicast is known to the transmitting device, and the receiving device feeds back ACK if it receives the data correctly, and feeds back NACK if it receives the data incorrectly. It can be inferred that another valid value of the HARQ activation information field, such as "0", indicates that the receiving device does not need to feed back HARQ information.

[0100] If the second-level SCI contains a field for information on the communication range required for receiving PSSCH (used for multicast mode based on the transmission distance between the transmitting device and the receiving device for feedback of HARQ (Tx-Rx distance-based HARQ)), when the value of the information on the communication range required for receiving PSSCH is 0, it indicates that the receiving device of the multicast mode based on the transmission distance between the transmitting device and the receiving device does not need to feedback HARQ information; when the value of the information on the communication range required for receiving PSSCH is greater than 0, HARQ information needs to be fed back.

[0101] The first-level SCI and the second-level SCI together constitute the complete sideline control information to instruct the receiving device to receive the PSSCH. Therefore, the data transmission process in the sideline communication is roughly as follows:

[0102] The transmitting device sends the PSCCH to the receiving device, and the PSCCH carries the first-level SCI.

[0103] The receiving end device performs channel estimation on the PSCCH carrying the first-level SCI according to the DMRS from the transmitting end device to decode the first-level SCI, and further obtains the sideline control information included in the first-level SCI for decoding the PSSCH.

[0104] Furthermore, the receiving end device can obtain the AL of the second-level SCI based on the AL field of the first-level SCI, and then receive the second-level SCI and obtain other sideline control information for decoding PSSCH contained in the second-level SCI in addition to the sideline control information contained in the first-level SCI.

[0105] According to the sideline control information contained in both the first-level SCI and the second-level SCI, the receiving end device receives and decodes the PSSCH to complete the sideline communication.

[0106] However, the two-level SCI solution is not applicable to all scenarios of sideline communication. For example, in a sideline communication system, there may be physical layer unicast, multicast, broadcast scenarios and different transmission modes. For example, the mode in which network devices schedule resources and the transmission mode in which terminal devices autonomously select resources. In some scenarios, the second-level SCI indication may not be required.

[0107] For example, in the scenario of sideline broadcast transmission, all sideline scheduling information required for transmitting sideline broadcast data can be included in the first-level SCI. At this time, if the transmitting device continues to send the second-level SCI to the receiving device, on the one hand, it will lead to the waste of time and frequency resources used to send the second-level SCI, and on the other hand, it will also reduce the spectrum efficiency of the sideline communication system.

[0108] For another example, during the sideline communication, if the receiving device obtains a portion of the configuration information for transmitting the PSSCH through configuration grant, i.e., RRC signaling of the Uu air interface or RRC signaling of the PC-5 air interface, then the transmitting device does not need to send the second-level SCI to instruct the receiving device to decode the PSSCH sent by the transmitting device. In this scenario, the second-level SCI is also redundant.

[0109] Considering that there are many scenarios in which two-level SCI is not suitable for sideline communication (such as the scenarios exemplified above), the present application provides a method for sending sideline control information, aiming to remove two-level SCI in sideline communication. In a scenario where the second-level SCI is not required, the transmitting device notifies the receiving device that the transmitting device does not send the second-level SCI to the receiving device, so that the resources used to send the second-level SCI are used for other purposes, such as for data transmission, thereby avoiding resource waste and improving the spectrum efficiency of the sideline communication system.

[0110] The technical solution provided by this application is introduced in detail below.

[0111] It should be noted that the first terminal device mentioned below may be a transmitting device in sideline communication, or a circuit system installed in the transmitting device, such as a chip or an integrated circuit. The second terminal device may be a receiving device in sideline communication, or a circuit system installed in the receiving device, such as a chip or an integrated circuit.

[0112] Optionally, the chip mentioned here may be a system on chip (SoC), a baseband chip, etc.

[0113] See also Figure 2 , Figure 2 A flowchart of a method 200 for sending sideline control information provided in the present application.

[0114] 210. The first terminal device sends a first-level SCI to the second terminal device.

[0115] The first level SCI may also be referred to as first sideline control information. In the present application, the first terminal device may also be referred to as a transmitting end device or a transmitting end device, and the second terminal device may also be referred to as a receiving end device or a receiving end device.

[0116] The first level SCI includes first indication information, and the first indication information is used to indicate whether the first terminal device sends the second level SCI to the second terminal device. The second level SCI may also be referred to as second side control information.

[0117] In a possible case, the first indication information specifically instructs the first terminal device not to send the second-level SCI to the second terminal device.

[0118] In another possible case, the first indication information specifically instructs the first terminal device to send the second level SCI to the second terminal device.

[0119] Accordingly, the second terminal device receives the first level SCI from the first terminal device.

[0120] In addition, the first-level SCI and the second-level SCI can refer to the above description and will not be repeated here.

[0121] If the first indication information specifically indicates that the first terminal device does not send the second level SCI to the second terminal device, the first terminal device performs step 220. If the first indication information specifically indicates that the first terminal device sends the second level SCI to the second terminal device, the first terminal device performs step 230.

[0122] 220. The first terminal device sends a PSSCH to the second terminal device according to the first-level SCI.

[0123] In step 210, the second terminal device receives the first level SCI. According to the first indication information carried by the first level SCI, if the first indication information specifically indicates that the first terminal device does not send the second level SCI to the second terminal device, the second terminal device receives the PSSCH from the first terminal device according to the first level SCI, as shown in step 240 below.

[0124] 230. The first terminal device sends the second-level SCI to the second terminal device according to the first-level SCI and the second-level SCI.

[0125] In step 210, the second terminal device receives the first level SCI. According to the first indication information carried by the first level SCI, if the first indication information specifically indicates that the first terminal device sends the second level SCI to the second terminal device, the second terminal device receives the PSSCH from the first terminal device according to the first level SCI and the second level SCI, as shown in steps 250-270 below.

[0126] It can be seen that in method 200 , the first terminal device can indicate to the second terminal device through the first-level SCI whether the first terminal device sends the second-level SCI to the second terminal device.

[0127] If the first terminal device instructs the first terminal device not to send the second-level SCI to the second terminal device through the first indication information included in the first-level SCI, it indicates that the PSSCH is only scheduled by the sidelink control information included in the first-level SCI.

[0128] Therefore, the first terminal device sends the PSSCH to the second terminal device according to the first level SCI.

[0129] Accordingly, the second terminal device receives the first-level SCI from the first terminal device, and according to the first indication information included in the first-level SCI, it can be learned that the first terminal device does not send the second-level SCI to the second terminal device. Therefore, the second terminal device receives the PSSCH from the first terminal device according to the side control information included in the received first-level SCI.

[0130] If the first terminal device instructs the first terminal device to send the second level SCI to the second terminal device through the first indication information included in the first level SCI, it indicates that the PSSCH is scheduled by the sideline control information included in the first level SCI and the second level SCI. The first terminal device also needs to send the second level SCI to the second terminal device.

[0131] Therefore, the first terminal device sends the PSSCH to the second terminal device according to the first level SCI and the second level SCI.

[0132] Correspondingly, the second terminal device receives the first-level SCI from the first terminal device. According to the first indication information included in the first-level SCI, it can be known that the first terminal device sends the second-level SCI to the second terminal device, indicating that the first terminal device uses two-level SCI to schedule PSSCH. Therefore, the second terminal device also needs to receive the second-level SCI from the first terminal device. According to the first-level SCI and the second-level SCI, the second terminal device receives PSSCH from the first terminal device.

[0133] Through the technical solution provided by method 200, in sideline communication, the first terminal device can flexibly indicate whether to send the second-level SCI to the second terminal device according to communication requirements, for example, whether to schedule PSSCH through two-level SCI or to schedule PSSCH through first-level SCI, thereby avoiding the waste of resources caused by uniformly adopting two-level SCI in any sideline communication scenario, or in other words, improving resource utilization efficiency. In addition, the spectrum efficiency of the system can also be improved.

[0134] Several examples of the first indication information included in the first-level SCI are given below.

[0135] Example 1

[0136] The first-level SCI includes an AL field, the AL field has at least two valid values, a first valid value of the at least two valid values ​​is used to indicate that the first terminal device does not send the second-level SCI to the second terminal device, wherein the first valid value is 0.

[0137] As described above, the first-level SCI includes an AL field, and the AL field is used to indicate the AL of the second-level SCI.

[0138] In the present application, the AL of the second-level SCI may indicate how many basic resource units for transmitting the second-level SCI are aggregated from the resource unit of the second-level SCI. The basic resource unit of the second-level SCI may be a common second-level sidelink control element (common 2 nd-stage sidelink control element, CSCE), is a set of several consecutive resource elements (resource element, RE), or a set of several resource blocks (resource blocks, RB). For example, the basic resource unit of the second-stage SCI can be 6 consecutive RBs, which are used to decode the DMRS resources of the second-stage CSI. The present application does not limit the size of the basic resource unit.

[0139] Therefore, the AL field of the first-level SCI can be used to indicate the number of CSCEs included in the second-level SCI, or the AL field can also be used to indicate the number of RBs or REs included in the second-level SCI.

[0140] Optionally, a CSCE may be a set of several consecutive REs or a set of several RBs.

[0141] For the transmitting device and the receiving device, the starting position of the time-frequency resource of the second-level SCI is known, for example, it can be obtained according to the position of the time-frequency resource of the first-level SCI according to the specified corresponding relationship, which is not limited in this application. Further, through the indication information of the AL field, the transmitting device can indicate the resource scheduling information of the second-level SCI.

[0142] Specifically, the AL field may include N bits, where N is a positive integer.

[0143] It is understandable that in the solution using two-level SCI, the transmitting end device sends the first level SCI and the second level SCI to the receiving end device, or in other words, the second level SCI must exist. Therefore, the aggregation level AL of the second level SCI is usually equal to or greater than 1.

[0144] It should be understood that when the number of bits N included in the AL field is determined, the number of valid values ​​of the AL field is also determined.

[0145] For example, when the AL field contains 3 bits, the AL field has 16 valid values ​​from 000 to 111 (i.e., 0 to 15 in decimal), which can be represented by indexes 0 to 15. When the AL field contains 2 bits, the AL field has 4 valid values ​​from 00 to 11 (i.e., 0 to 3 in decimal), which can be represented by indexes 0 to 3.

[0146] However, in the existing scenario of using two-level SCI, the AL of the second-level SCI indicated by the first-level SCI does not include the case of AL=0.

[0147] Therefore, the present application proposes to use AL=0 of the second-level SCI to implicitly indicate that the first terminal device does not send the second-level SCI to the second terminal device.

[0148] It can be understood that the first valid value "0" is a decimal representation of a valid value of the AL field.

[0149] In order to save indication overhead, each valid value of the AL field uniquely corresponds to an index. Therefore, the mapping relationship between the index corresponding to the valid value of the AL field of the first-level SCI and the AL of the second-level SCI can be shown in Table 1.

[0150] Table 1

[0151]

[0152] It should be noted that the values ​​listed in Table 1 are only examples. The valid values ​​of the AL field may be some of the values ​​in Table 1, or other values ​​outside Table 1.

[0153] It should be understood that in this implementation, the AL field has at least two valid values, and the valid value "0" among the at least two valid values ​​is used to indicate that the first terminal device does not send the second-level SCI to the second terminal device.

[0154] In this example, the valid value "0" is referred to as the first valid value in this document.

[0155] In addition, other valid values ​​of the at least two valid values ​​of the AL field of the first-level SCI except the first valid value are used to indicate that the first terminal device sends the second-level SCI to the second terminal device, and any other valid value except the first valid value specifically indicates the AL of the second-level SCI. Moreover, the AL of the second-level SCI indicated by the other valid values ​​is not 0.

[0156] The first terminal device and the second terminal device may each store a mapping relationship as shown in Table 1. The second terminal device determines whether the first terminal device sends a second-level SCI according to the index carried by the AL field of the received first-level SCI.

[0157] Case 1

[0158] If the AL field of the first-level SCI carries the index 0 (ie, the first valid value), it means that the first terminal device does not send the second-level SCI. At this time, the second terminal device receives the corresponding PSSCH according to the correctly decoded first-level SCI, as shown in step 240.

[0159] 240. The second terminal device receives the corresponding PSSCH according to the correctly decoded first-level SCI.

[0160] In this case, since the first terminal device only sends the first-level SCI to the second terminal device, the corresponding PSSCH mentioned in step 240 refers to the PSSCH scheduled by the first-level SCI.

[0161] Case 2

[0162] If the AL field of the first-level SCI carries an index other than 0 (ie, a valid value other than the first valid value), it means that the first terminal device sends the second-level SCI to the second terminal.

[0163] In the case that the AL field of the first-level SCI indicates that the first terminal device sends the second-level SCI to the second terminal device, the second terminal device may further perform steps 250 - 270 .

[0164] 250. The second terminal device determines the AL of the second-level SCI according to the AL field of the first-level SCI.

[0165] Specifically, according to other valid values ​​(or indexes thereof) carried by the AL field of the first-level SCI, the second terminal device may determine the value of AL corresponding to the other valid values.

[0166] For example, the AL field of the first-level SCI carries the index 7, indicating that the AL of the second-level SCI is 12.

[0167] 260. The second terminal device receives the second-level SCI from the first terminal device according to the determined AL of the second-level SCI.

[0168] For the first terminal device, if the AL field of the first-level SCI indicates that the first terminal device sends the second-level SCI to the second terminal device, the first terminal device sends the second-level SCI to the second terminal device after sending the first-level SCI. The second terminal device receives the second-level SCI according to the value of AL indicated by the AL field of the first-level SCI.

[0169] 270. The second terminal device receives the corresponding PSSCH according to the first-level SCI and the second-level SCI.

[0170] In the case where the first terminal device transmits the second level SCI to the second terminal device, the second terminal device receives the corresponding PSSCH according to the correctly decoded first level SCI and second level SCI.

[0171] In step 270, the "corresponding PSSCH" refers to the PSSCH scheduled jointly by the first-level SCI and the second-level SCI.

[0172] It should be understood that the numbering of the steps in method 200 is only for the purpose of clearly describing the technical solution, and does not represent the actual sequence of the steps. For example, the timing relationship between step 230 and step 260 can be that the first terminal device sends PSSCH first and then sends the second-level SCI, or the first terminal device sends the second-level SCI first and then sends PSSCH, or PSSCH and the second-level SCI can also be sent at the same time. Correspondingly, the receiving end device has no sequence relationship for the reception order of the second-level SCI and PSSCH. Therefore, Figure 2 The numbering of the steps shown should not limit the scheme of the present application.

[0173] In summary, when the first terminal device does not send the second-level SCI to the second terminal device, Figure 2 The method 200 shown includes step 210, step 220 and step 240. In the case where the first terminal device sends the second level SCI to the second terminal device, the method 200 includes step 210, step 230 and steps 250-270.

[0174] In addition, these steps are only numbered to illustrate the technical solution. The specific process can be compared. Figure 2 The steps shown may be fewer, or may include more steps, which is not limited herein.

[0175] In Example 1, the effective value "0" of the AL field of the first-level SCI indicates that the AL of the second-level SCI is 0, implicitly indicating that the first terminal device does not send the second-level SCI to the second terminal device, and does not increase the overhead of signaling or indication resources.

[0176] Example 2

[0177] In Example 2, first indication information is additionally added to the first-level SCI, and the first indication information is used to indicate whether the first terminal device sends the second-level SCI to the second terminal device.

[0178] In this implementation, the first-level SCI includes both the AL field and the first indication information.

[0179] Optionally, the first indication information may include 1 bit, which is used to indicate whether the first terminal device sends the second-level SCI to the second terminal device. For example, the first indication information includes two valid values, namely "0" and "1". Among them, 0 indicates that the first terminal device does not send the second-level SCI to the second terminal device, and 1 indicates that the first terminal device sends the second-level SCI to the second terminal device.

[0180] Further, when the first indication information specifically indicates that the first terminal device sends the second-level SCI to the second terminal device, the value of the AL of the second-level SCI can be indicated by the AL field of the first-level SCI. Wherein, the AL of the second-level SCI indicated by the AL field of the first-level SCI is not 0.

[0181] In this implementation, the first indication information includes two valid values, one valid value is used to instruct the first terminal device not to send the second level SCI to the second terminal device, and the other valid value is used to instruct the first terminal device to send the second level SCI to the second terminal device.

[0182] Similarly, the second terminal device can determine whether the first terminal device sends the second-level SCI according to the valid value of the first indication information. When the first indication information indicates that the first terminal device does not send the second-level SCI, the second terminal device performs step 230. When the first indication information indicates that the first terminal device sends the second-level SCI, the second terminal device performs steps 250-270, see the above description, which will not be repeated here.

[0183] In method 200, the first terminal device indicates to the second terminal device whether to send the second level SCI to the second terminal device by carrying the first indication information in the first level SCI. Other methods for the first terminal device to indicate to the second terminal device whether to send the second level SCI are given below.

[0184] See also Figure 3 , Figure 3 Flow chart of the method 300 for sending side line control information provided in the present application.

[0185] 310. The first terminal device sends a first-level SCI to the second terminal device.

[0186] The cyclic redundancy check bit corresponding to the first-level SCI is scrambled by scrambling information. The scrambling information includes a first identifier or a second identifier, the first identifier is used to indicate that the first terminal device does not send the second-level SCI to the second terminal device, and the second identifier is used to indicate that the first terminal device sends the second-level SCI to the second terminal device.

[0187] In a possible case, the cyclic redundancy check bit corresponding to the first-level SCI is scrambled by the first identifier.

[0188] In another possible case, the cyclic redundancy check bit corresponding to the first-level SCI is scrambled by the second identifier.

[0189] If the cyclic redundancy check (CRC) corresponding to the first-level SCI is scrambled by the first identifier, it means that the first terminal device does not send the second-level SCI to the second terminal device, and the first terminal device executes step 320 .

[0190] If the CRC corresponding to the first-level SCI is scrambled by the second identifier, indicating that the first terminal device sends the second-level SCI to the second terminal device, the first terminal device will also send the second-level SCI to the second terminal device and execute step 330 .

[0191] Accordingly, the second terminal device receives the first-level SCI from the first terminal device, and descrambles the CRC of the first-level SCI.

[0192] If the second terminal device successfully descrambles the CRC of the first level SCI using the first identifier, it means that the first terminal device does not send the second level SCI to the second terminal device. If the second terminal device successfully descrambles the CRC of the first level SCI using the second identifier, it means that the first terminal device sends the second level SCI to the second terminal device.

[0193] 320. The first terminal device sends a PSSCH to the second terminal device according to the first-level SCI.

[0194] In step 310, the second terminal device receives the first-level SCI. By descrambling the CRC of the first-level SCI, it can be known whether the first terminal device sends the second-level SCI to the second terminal device.

[0195] When the second terminal device successfully descrambles the CRC of the first-level SCI using the first identifier, the second terminal device receives the PSSCH from the first terminal device according to the first-level SCI.

[0196] 330. The first terminal device sends the second-level SCI to the second terminal device according to the first-level SCI and the second-level SCI.

[0197] When the second terminal device successfully descrambles the CRC of the first-level SCI using the second identifier, it indicates that the first terminal device sends the second-level SCI to the second terminal device. In this case, the second terminal device further receives the second-level SCI from the first terminal device according to the AL of the second-level SCI indicated by the AL field of the first-level SCI. Finally, the PSSCH is received from the first terminal device according to the first-level SCI and the second-level SCI.

[0198] It should be noted that the first identifier and the second identifier of method 300 are used to implicitly indicate to the second terminal device whether the first terminal device sends the second-level SCI. Therefore, as long as the first identifier and the second identifier are defined to be different, the specific structures of the first identifier and the second identifier are not concerned with the solution of this application.

[0199] It can be seen that in method 300, the first terminal device can scramble the CRC of the first-level SCI by using different identifiers to implicitly indicate to the second terminal device whether the first terminal device sends the second-level SCI to the second terminal device.

[0200] By adopting the method 300, the first terminal device can indicate to the second terminal device whether to send the second-level SCI without changing the structure of the first-level SCI, without incurring the overhead of signaling or indication resources.

[0201] See also Figure 4 , Figure 4 Flow chart of the method 400 for sending side line control information provided in the present application.

[0202] 410. The first terminal device sends a first-level SCI to the second terminal device.

[0203] 420. The first terminal device sends a reference signal to the second terminal device.

[0204] The reference signal includes a first reference signal or a second reference signal. The first reference signal is used to instruct the first terminal device not to send the second level SCI to the second terminal device, and the second reference signal is used to instruct the first terminal device to send the second level SCI to the second terminal device.

[0205] Optionally, the reference signal may be a DMRS. Accordingly, the first reference signal may be a first DMRS, and the second reference signal may be a second DMRS.

[0206] Those skilled in the art should understand that in step 420, the reference signal sent by the first terminal device to the second terminal device is used by the second terminal device to estimate the channel so as to decode the PSCCH carrying the first-level SCI.

[0207] In one possible scenario, the first terminal device sends a first reference signal to the second terminal device for channel estimation.

[0208] In another possible scenario, the first terminal device sends a second reference signal to the second terminal device for channel estimation.

[0209] If the first terminal device sends the first reference signal to the second terminal device, it means that the first terminal device does not send the second level SCI to the second terminal device. The first terminal device executes step 430 .

[0210] If the first terminal device sends the second reference signal to the second terminal device, which means that the first terminal device sends the second level SCI to the second terminal device, the first terminal device executes step 440 .

[0211] Accordingly, the second terminal device detects the reference signal from the first terminal device. If the second terminal device detects the first reference signal, the second terminal device learns that the first terminal device does not send the second-level SCI.

[0212] If the second terminal device detects the second reference signal, the second terminal device learns that the first terminal device sends the second level SCI.

[0213] 430. The first terminal device sends a PSSCH to the second terminal device according to the first-level SCI.

[0214] In step 420, the second terminal device detects the first reference signal sent by the first terminal device, and can know that the first terminal device does not send the second-level SCI to the second terminal device. Therefore, the second terminal device receives the PSSCH from the first terminal device according to the first-level SCI.

[0215] 440. The first terminal device sends the second-level SCI to the second terminal device according to the first-level SCI and the second-level SCI.

[0216] In step 420, the second terminal device detects the second reference signal sent by the first terminal device, and it can be known that the first terminal device sends the second-level SCI to the second terminal device. In this case, the second terminal device further receives the second-level SCI from the first terminal device according to the AL of the second-level SCI indicated by the AL field of the first-level SCI. Finally, the PSSCH is received from the first terminal device according to the first-level SCI and the second-level SCI.

[0217] Similar to the functions of the first identifier and the second identifier described above, the functions of the first reference signal and the second reference signal of the method 400 are to implicitly indicate to the second terminal device whether the first terminal device sends the second-level SCI. Therefore, as long as the first reference signal and the second reference signal are defined to be different, the scheme of the present application does not focus on the mapping pattern of the first reference signal and the second reference signal.

[0218] It can be seen that in method 400, the first terminal device uses different reference signals for the second terminal device to perform channel estimation to decode the PSCCH carrying the first-level SCI, which can implicitly indicate to the second terminal device whether the first terminal device sends the second-level SCI to the second terminal device.

[0219] By adopting the method 400, the first terminal device can indicate to the second terminal device whether to send the second-level SCI without changing the structure of the first-level SCI, without incurring the overhead of signaling or indication resources.

[0220] The technical solution of the present application is described in detail above. In a scenario where the sideline communication system does not require a second-level SCI, the transmitting device of the sideline communication (i.e., the first terminal device) can indicate to the receiving device (i.e., the second terminal device) whether the first terminal device sends a second-level SCI through the first-level SCI, or the scrambling information of the CRC of the first-level SCI, or the reference signal used for channel estimation to decode the PSCCH carrying the first-level SCI, so that according to the specific scenario of the sideline communication, it is possible to flexibly choose to use two-level SCI or one-level SCI, which can avoid the waste of resources caused by the use of two-level SCI in any scenario of the sideline communication, and at the same time improve the spectrum efficiency of the sideline communication system.

[0221] Several examples of scenarios in which the first terminal device does not send the second-level SCI to the second terminal device in side communication are listed below. The technical solution of the present application is applicable to the scenarios listed below.

[0222] Scenario Example 1

[0223] Side broadcast data transmission

[0224] In this scenario, all sidewalk scheduling information used by the first terminal device to schedule sidewalk broadcast data may be indicated by the first-level SCI, and the first terminal device does not need to send the second-level SCI to the second terminal device.

[0225] Scenario Example 2

[0226] Mode 1 configuration permission mode

[0227] In this scenario, the transmitting end device sends a radio resource control (RRC) message to the receiving end device, and the RRC message carries a configured grant, wherein the information required to be indicated by the second-level SCI can be carried in the configured grant. Therefore, the first terminal device does not need to send the second-level SCI to the second terminal device.

[0228] Scenario Example 3

[0229] Mode 2: The terminal device independently selects resources

[0230] In this scenario, the information that needs to be indicated by the second-level SCI can be carried in a pre-configured sidelink grant (SG) or time frequency resource pattern (TFRP).

[0231] Both the transmitting device and the receiving device know the pre-configured SG and TFRP. Therefore, the receiving device can determine which SG and TFRP the transmitting device uses by sensing and measuring. Therefore, the first terminal device does not need to send the second-level SCI to the second terminal device.

[0232] It should be understood that the above scenarios are only examples. There may be other scenarios in sideline communication that do not require the two-level SCI solution, and the solutions of this application are applicable.

[0233] The method for sending and receiving side control information provided by the present application is described in detail above. The terminal device provided by the present application is introduced below.

[0234] See also Figure 5 , Figure 5 1 is a schematic block diagram of a terminal device 1000 provided in this application. Figure 5 As shown, the terminal device 1000 includes a transceiver unit 1100 and a processing unit 1200 .

[0235] In one implementation, the terminal device 1000 indicates whether to send the second-level SCI to the second terminal device through the first indication information carried in the first-level SCI. In this implementation, the functions of the transceiver unit 1100 and the processing unit 1200 are as follows:

[0236] The transceiver unit 1100 is configured to send first-level side control information SCI to a second terminal device, where the first-level SCI includes first indication information, where the first indication information is used to indicate whether the terminal device sends second-level side control information SCI to the second terminal device;

[0237] The processing unit 1200 is configured to control the transceiver unit 1200 to send a PSSCH to the second terminal device according to the first-level SCI, wherein the first indication information indicates that the terminal device does not send the second-level side control information SCI to the second terminal device; or

[0238] The processing unit 1200 is used to control the transceiver unit 1200 to send PSSCH to the second terminal device according to the first level SCI and the second level SCI, wherein the first indication information indicates that the terminal device does not send the second level side control information SCI to the second terminal device.

[0239] Optionally, the transceiver unit 1100 may also be replaced by a sending unit or a receiving unit. For example, when the transceiver unit 1100 performs a sending action, it may be replaced by a sending unit. When the transceiver unit 1100 performs a receiving action, it may be replaced by a receiving unit.

[0240] Optionally, in one embodiment, the first indication information is used to indicate whether the first terminal device sends second-level side control information SCI to the second terminal device, including:

[0241] The first-level SCI includes an aggregation level AL field, the AL field has at least two valid values, the at least two valid values ​​include a first valid value, the first valid value is 0, and 0 is used to indicate that the first terminal device does not send the second-level SCI to the second terminal device; and

[0242] The other valid values ​​of the at least two valid values ​​except the first valid value are used to instruct the first terminal device to send the second level SCI to the second terminal device, and any one of the other valid values ​​is specifically used to indicate the aggregation level of the second level SCI.

[0243] Optionally, in another embodiment, the first indication information is used to indicate whether the first terminal device sends second-level side control information SCI to the second terminal device, including:

[0244] The first indication information has at least two valid values, and a first valid value among the at least two valid values ​​is used to instruct the first terminal device not to send the second level SCI to the second terminal device;

[0245] The second valid value of the at least two valid values ​​is used to indicate that the first terminal device sends the second level SCI to the second terminal device, and the first level SCI also includes an aggregation level AL field, and the valid value of the AL field is used to indicate the aggregation level of the second level SCI.

[0246] Optionally, in another embodiment, the first indication information instructs the terminal device not to send second-level side control information SCI to the second terminal device, and the processing unit 1200 controls the transceiver unit 1100 to send PSSCH to the second terminal device according to the first-level SCI, wherein the transmission type of the PSSCH is broadcast.

[0247] In another implementation, the terminal device 1000 indicates whether to send the second-level SCI to the second terminal device through the scrambling information of the first-level SCI. In this implementation, the functions of the transceiver unit 1100 and the processing unit 1200 are as follows:

[0248] The transceiver unit 1100 is configured to send a first-level SCI to a second terminal device, wherein a cyclic redundancy check bit of the first-level SCI is scrambled by scrambling information, wherein the scrambling information includes a first identifier or a second identifier, the first identifier is used to indicate that the first terminal device does not send a second-level SCI to the second terminal device, and the second identifier is used to indicate that the first terminal device sends a second-level SCI to the second terminal device;

[0249] The processing unit 1200 is configured to control the transceiver unit 1100 to send a physical sidelink shared channel PSSCH to the second terminal device according to the first-level SCI, wherein the scrambling information includes a first identifier; or

[0250] The processing unit 1200 is configured to control the transceiver unit 1100 to send a physical sidelink shared channel PSSCH to the second terminal device according to the first level SCI and the second level SCI, wherein the scrambling information includes a second identifier.

[0251] In another implementation, the terminal device 1000 indicates whether to send the second-level SCI to the second terminal device through a reference signal for decoding the first-level SCI. In this implementation, the functions of the transceiver unit 1100 and the processing unit 1200 are as follows:

[0252] The transceiver unit 1100 is configured to send a reference signal to the second terminal device, where the reference signal includes a first reference signal or a second reference signal, wherein the first reference signal is used to instruct the terminal device not to send a second-level SCI to the second terminal device, and the second reference signal is used to instruct the terminal device to send a second-level SCI to the second terminal device;

[0253] The processing unit 1200 is configured to control the transceiver unit 1100 to send a physical sidelink shared channel PSSCH to the second terminal device according to the first-level SCI, wherein the reference signal includes a first reference signal; or

[0254] The processing unit 1200 is configured to control the transceiver unit 1100 to send the PSSCH to the second terminal device according to the first level SCI and the second level SCI, wherein the reference signal includes a second reference signal.

[0255] Optionally, in an embodiment, the reference signal may be a DMRS. The first reference signal may be a first DMRS, and the second reference signal may be a second DMRS.

[0256] Optionally, the terminal device 1000 may be a transmitting end device in the sideline communication, for example, a terminal device or a combination device, a component, etc. in the terminal device that can realize the functions of the first terminal device described above. The transceiver unit 1100 may be a transceiver. The transceiver may be replaced by a receiver or a transmitter. For example, when the transceiver performs a sending action, it may be replaced by a transmitter. When the transceiver performs a receiving action, it may be replaced by a receiver. The processing unit 1200 may be a processing device or a processor.

[0257] Optionally, the terminal device 1000 may be a circuit system installed in a transmitting end device, such as a chip or a system on chip (SoC). In this implementation, the transceiver unit 1100 may be a communication interface. For example, the transceiver unit 1100 may be an input-output interface or an input-output circuit. The input-output interface may include an input interface and an output interface. The input-output circuit may include an input circuit and an output circuit. The processing unit 1200 may be a processing device or a processor.

[0258] The functions of the processing device may be implemented by hardware, or by executing corresponding software through hardware. For example, the processing device may include one or more memories and one or more processors, wherein the one or more memories are used to store computer programs, and the one or more processors read and execute the computer programs stored in the one or more memories, so that the terminal device 1000 performs the operations and / or processing performed by the first terminal device in each method embodiment.

[0259] Alternatively, the processing device may only include a processor, and a memory for storing the computer program is located outside the processing device. The processor is connected to the memory through circuits / wires to read and execute the computer program stored in the memory.

[0260] Optionally, the transceiver unit 1100 may be a radio frequency device, and the processing unit 1200 may be a baseband device.

[0261] See also Figure 6 , Figure 6 2 is a schematic block diagram of a terminal device 2000 provided in this application. Figure 6 As shown, the terminal device includes a transceiver unit 2100 and a processing unit 2200 .

[0262] In one implementation, the transmitting end device of the sideline communication (for example, the first terminal device in this article) indicates whether the first terminal device sends the second-level SCI to the receiving end device of the sideline communication through the first indication information carried by the first-level SCI. In this implementation, the functions of the transceiver unit 2100 and the processing unit 2200 are as follows:

[0263] The transceiver unit 2100 is configured to receive a first-level SCI from a first terminal device, where the first-level SCI includes first indication information, where the first indication information is used to indicate whether the first terminal device sends a second-level SCI to the terminal device;

[0264] The processing unit 2200 is configured to control the transceiver unit 2100 to receive a PSSCH from the first terminal device according to the first-level SCI, wherein the first indication information indicates that the first terminal device does not send the second-level SCI to the terminal device; or

[0265] The processing unit 2200 is used to control the transceiver unit 2100 to receive the PSSCH from the first terminal device according to the first level SCI and the second level SCI, wherein the first indication information instructs the first terminal device to send the second level SCI to the second terminal device.

[0266] Optionally, the transceiver unit 2100 may also be replaced by a sending unit or a receiving unit. For example, when the transceiver unit 2100 performs a sending action, it may be replaced by a sending unit. When the transceiver unit 2100 performs a receiving action, it may be replaced by a receiving unit.

[0267] Optionally, in one embodiment, the first indication information is used to indicate whether the first terminal device sends second-level side control information SCI to the second terminal device, including:

[0268] The first-level SCI includes an aggregation level AL field, the AL field has at least two valid values, the at least two valid values ​​include a first valid value, the first valid value is 0, and 0 is used to indicate that the first terminal device does not send the second-level SCI to the second terminal device; and

[0269] The other valid values ​​of the at least two valid values ​​except the first valid value are used to instruct the first terminal device to send the second level SCI to the second terminal device, and any one of the other valid values ​​is specifically used to indicate the aggregation level of the second level SCI.

[0270] Optionally, in another embodiment, the first indication information is used to indicate whether the first terminal device sends second-level side control information SCI to the second terminal device, including:

[0271] The first indication information has at least two valid values, and a first valid value among the at least two valid values ​​is used to instruct the first terminal device not to send the second level SCI to the second terminal device;

[0272] The second valid value of the at least two valid values ​​is used to indicate that the first terminal device sends the second level SCI to the second terminal device, and the first level SCI also includes an aggregation level AL field, and the valid value of the AL field is used to indicate the aggregation level of the second level SCI.

[0273] In another implementation, the first terminal device indicates whether to send the second-level SCI to the terminal device through the scrambling information of the first-level SCI. In this implementation, the functions of the transceiver unit 2100 and the processing unit 2200 of the terminal device 2000 are as follows:

[0274] The transceiver unit 2100 is configured to receive a first-level SCI from a first terminal device, wherein a cyclic redundancy check bit of the first-level SCI is scrambled by scrambling information, wherein the scrambling information includes a first identifier or a second identifier, the first identifier is used to instruct the first terminal device not to send a second-level SCI to the second terminal device, and the second identifier is used to instruct the first terminal device to send a second-level SCI to the second terminal device;

[0275] The processing unit 2200 is configured to control the transceiver unit 2100 to receive the PSSCH from the first terminal device according to the first-level SCI, wherein the scrambling information includes a first identifier; or

[0276] The processing unit 2200 is used to control the transceiver unit 2100 to receive the PSSCH from the first terminal device according to the first level SCI and the second level SCI, wherein the scrambling information includes a second identifier.

[0277] In another implementation, the first terminal device indicates whether the first terminal device sends the second-level SCI to the terminal device through a reference signal for decoding the first-level SCI. In this implementation, the functions of the transceiver unit 1100 and the processing unit 1200 of the terminal device 2000 are as follows:

[0278] The transceiver unit 2100 is configured to receive first level side control information SCI from a first terminal device;

[0279] The transceiver unit 2100 is further configured to detect reference information from the first terminal device, the reference signal comprising a first reference signal or a second reference signal, wherein the first reference signal is used to instruct the first terminal device not to send a second level SCI to the terminal device, and the second reference signal is used to instruct the first terminal device to send a second level SCI to the terminal device;

[0280] The processing unit 2200 is configured to control the transceiver unit 2100 to receive a PSSCH from the first terminal device according to the first-level SCI, wherein the reference signal includes a first reference signal; or

[0281] The processing unit 2200 is configured to control the transceiver unit 2100 to receive the PSSCH from the first terminal device according to the first level SCI and the second level SCI, wherein the reference signal includes a second reference signal.

[0282] Optionally, the terminal device 2000 may be a receiving end device in the sideline communication, such as a terminal device or a combination device or component in the terminal device that can realize the function of the second terminal device described above. The transceiver unit 2100 may be a transceiver. The transceiver may be replaced by a receiver or a transmitter. For example, when the transceiver performs a sending action, it may be replaced by a transmitter. When the transceiver performs a receiving action, it may be replaced by a receiver. The processing unit 2200 may be a processing device or a processor.

[0283] In another implementation, the terminal device 2000 may be a circuit system installed in a receiving device, such as a chip or an integrated circuit. The transceiver unit 2100 may be a communication interface. For example, the transceiver unit 2100 may be an input-output interface or an input-output circuit. The input-output interface may include an input interface and an output interface. The input-output circuit may include an input circuit and an output circuit. The processing unit 2200 may be a processing device.

[0284] The functions of the processing device may be implemented by hardware, or by executing corresponding software through hardware. For example, the processing device may include one or more memories and one or more processors, wherein the one or more memories are used to store computer programs, and the one or more processors read and execute the computer programs stored in the one or more memories, so that the terminal device 2000 performs the operations and / or processing performed by the second terminal device in each method embodiment.

[0285] Alternatively, the processing device may only include a processor, and a memory for storing the computer program is located outside the processing device. The processor is connected to the memory through circuits / wires to read and execute the computer program stored in the memory.

[0286] Optionally, the transceiver unit 2100 may be a radio frequency device, and the processing unit 2200 may be a baseband device.

[0287] See also Figure 7 , Figure 7 is a schematic structural diagram of the terminal device 10 provided in this application. Figure 7 As shown, the terminal device 10 includes: one or more processors 11, one or more memories 12, and one or more communication interfaces 13. The processor 11 is used to control the communication interface 13 to send and receive signals, the memory 12 is used to store computer programs, and the processor 11 is used to call and run the computer program from the memory 12, so that the terminal device 10 performs the processing and / or operation performed by the first terminal device in each method embodiment of the present application.

[0288] For example, the processor 11 may have Figure 5 The functions of the processing unit 1200 shown in FIG. 1 and the communication interface 13 may have Figure 5 The functions of the transceiver unit 1100 shown in FIG. Figure 5 The instructions in the article will not be repeated here.

[0289] Optionally, when the terminal device 10 is a transmitting device of the side link, the processor 11 may be a baseband device installed in the transmitting device, and the communication interface 13 may be a radio frequency device.

[0290] See also Figure 8 , Figure 8 2 is a schematic structural diagram of the terminal device 20 provided in this application. Figure 8As shown, the terminal device 20 includes: one or more processors 21, one or more memories 22, and one or more communication interfaces 23. The processor 21 is used to control the communication interface 23 to send and receive signals, the memory 22 is used to store computer programs, and the processor 21 is used to call and run the computer program from the memory 22, so that the terminal device 20 performs the processing and / or operation performed by the second terminal device in each method embodiment of the present application.

[0291] For example, the processor 21 may have Figure 6 The functions of the processing unit 2200 shown in FIG. 2 , the communication interface 23 may have Figure 6 The functions of the transceiver unit 2100 shown in FIG. Figure 6 The instructions in the article will not be repeated here.

[0292] Optionally, the memory and the memory in the above-mentioned device embodiments may be physically independent units, or the memory may be integrated with the processor.

[0293] In addition, the present application also provides a computer-readable storage medium, which stores computer instructions. When the computer instructions are executed on a computer, the computer executes the operations and / or processing performed by the first terminal device in the method for sending side control information provided in the present application.

[0294] The present application also provides a computer-readable storage medium, in which computer instructions are stored. When the computer instructions are executed on a computer, the computer executes the operations and / or processing performed by the second terminal device in the method for sending side control information provided in the present application.

[0295] The present application also provides a computer program product, which includes computer program code. When the computer program code runs on a computer, it enables the computer to execute the operations and / or processing performed by the first terminal device in the method for sending side control information provided in the present application.

[0296] The present application also provides a computer program product, which includes computer program code. When the computer program code runs on a computer, it enables the computer to execute the operations and / or processing performed by the second terminal device in the method for sending side control information provided by the present application.

[0297] The present application also provides a terminal device, including a processor and an interface circuit, wherein the interface circuit is used to receive computer codes or instructions and transmit them to the processor, and the processor is used to run the computer codes or instructions to execute the operations and / or processing performed by the first terminal device in the method for sending side control information provided in the present application.

[0298] The present application also provides a terminal device, including a processor and an interface circuit, wherein the interface circuit is used to receive computer codes or instructions and transmit them to the processor, and the processor is used to run the computer codes or instructions to execute the operations and / or processing performed by the second terminal device in the method for sending side control information provided in the present application.

[0299] The present application also provides a chip, the chip comprising one or more processors. The one or more processors are used to execute a computer program stored in a memory to perform the operation and / or processing performed by the first terminal device in any one of the method embodiments. The memory for storing the computer program is set independently of the chip.

[0300] Furthermore, the chip may further include one or more communication interfaces. The one or more communication interfaces may be input / output interfaces, input / output circuits, etc. Furthermore, the chip may further include one or more memories.

[0301] The present application also provides a chip, the chip comprising one or more processors. The one or more processors are used to execute a computer program stored in a memory to perform the operation and / or processing performed by the second terminal device in any one of the method embodiments. The memory for storing the computer program is set independently of the chip.

[0302] Furthermore, the chip may further include one or more communication interfaces. The one or more communication interfaces may be input / output interfaces, input / output circuits, etc. Furthermore, the chip may further include one or more memories.

[0303] In addition, the present application also provides a side communication system, including the first terminal device and / or the second terminal device in the embodiments of the present application.

[0304] Furthermore, the sideline communication system may also include access network equipment and / or core network equipment.

[0305] The processor in the embodiment of the present application can be an integrated circuit chip with the ability to process signals. In the implementation process, each step of the above method embodiment can be completed by the hardware integrated logic circuit or software instructions in the processor. The processor can be a general processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (application specific integrated circuit, ASIC), a field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The general processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiment of the present application can be directly embodied as a hardware coding processor to perform, or the hardware and software modules in the coding processor are combined to perform. The software module can be located in a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, and other mature storage media in the art. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0306] The memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct RAM bus RAM (DRRAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0307] The terms "unit", "system", etc. used in this specification are used to represent computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program, and / or a computer. By way of illustration, both applications running on a computing device and a computing device can be components. One or more components may reside in a process and / or an execution thread. A component may be located on a computer and / or distributed between two or more computers. In addition, these components may be executed from various computer-readable media having various data structures stored thereon. Components may communicate through local and / or remote processes according to signals having one or more data packets (e.g., data from two components interacting with another component between a local system, a distributed system, and / or a network, for example, the Internet interacting with other systems through signals).

[0308] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0309] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0310] In the several embodiments provided in the present 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 only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, 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.

[0311] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0312] 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.

[0313] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk, or an optical disk.

[0314] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for sending side control information, characterized in that: include: The first terminal device sends first-level side control information SCI to the second terminal device, where the first-level SCI includes first indication information, and the first indication information is used to indicate whether the first terminal device sends second-level side control information SCI to the second terminal device; The first indication information indicates that the first terminal device does not send second-level sidelink control information SCI to the second terminal device, and the first terminal device sends a physical sidelink shared channel PSSCH to the second terminal device according to the first-level SCI, or The first indication information indicates that the first terminal device sends second-level sidelink control information SCI to the second terminal device, and the first terminal device sends a physical sidelink shared channel PSSCH to the second terminal device according to the first-level SCI and the second-level SCI; wherein, The first indication information is used to indicate whether the first terminal device sends second-level side control information SCI to the second terminal device, including: The first-level SCI includes an aggregation level AL field, the AL field has at least two valid values, the at least two valid values ​​include a first valid value, the first valid value is 0, and 0 is used to indicate that the first terminal device does not send the second-level SCI to the second terminal device; and The other valid values ​​of the at least two valid values ​​except the first valid value are used to instruct the first terminal device to send the second level SCI to the second terminal device, and any one of the other valid values ​​is specifically used to indicate the aggregation level of the second level SCI.

2. The method according to claim 1, characterized in that The first indication information indicates that the first terminal device does not send second-level sidelink control information SCI to the second terminal device, and the first terminal device sends a physical sidelink shared channel PSSCH to the second terminal device according to the first-level SCI, wherein the transmission type of the PSSCH is broadcast.

3. A method for sending side control information, characterized in that: include: The first terminal device sends first-level side control information SCI to the second terminal device, and the cyclic redundancy check bit corresponding to the first-level SCI is scrambled by scrambling information, wherein the scrambling information includes a first identifier or a second identifier, the first identifier is used to instruct the first terminal device not to send the second-level SCI to the second terminal device, and the second identifier is used to instruct the first terminal device to send the second-level SCI to the second terminal device; The scrambling information includes a first identifier, and the first terminal device sends a physical sidelink shared channel PSSCH to the second terminal device according to the first level SCI, or The scrambling information includes a second identifier, and the first terminal device sends a physical sidelink shared channel PSSCH to the second terminal device according to the first level SCI and the second level SCI.

4. The method according to claim 3, characterized in that The scrambling information includes a first identifier, the first terminal device sends the PSSCH to the second terminal device according to the first-level SCI, and the transmission type of the PSSCH is broadcast.

5. A method for sending side control information, characterized in that: include: The first terminal device sends first level side control information SCI to the second terminal device; The first terminal device sends a reference signal to the second terminal device, the reference signal comprising a first reference signal or a second reference signal, wherein the first reference signal is used to instruct the first terminal device not to send a second level SCI to the second terminal device, and the second reference signal is used to instruct the first terminal device to send a second level SCI to the second terminal device; The reference signal includes the first reference signal, and the first terminal device sends a physical sidelink shared channel PSSCH to the second terminal device according to the first level SCI; The reference signal includes the second reference signal, and the first terminal device sends the PSSCH to the second terminal device according to the first level SCI and the second level SCI.

6. The method according to claim 5, characterized in that The reference signal includes the first reference signal, and the first terminal device sends the PSSCH to the second terminal device according to the first level SCI, wherein the transmission type of the PSSCH is broadcast.

7. The method according to claim 5 or 6, characterized in that: The reference signal includes a demodulation reference signal DMRS for demodulating a sidelink physical control channel PSCCH carrying the first level SCI, the first reference signal is a first DMRS, and the second reference signal is a second DMRS.

8. A method for receiving side control information, characterized in that: include: The second terminal device receives the first-level SCI from the first terminal device, where the first-level SCI includes first indication information, and the first indication information is used to indicate whether the first terminal device sends the second-level SCI to the second terminal device; The first indication information indicates that the first terminal device does not send the second-level SCI to the second terminal device, and the second terminal device receives a physical sidelink shared channel PSSCH from the first terminal device according to the first-level SCI; The first indication information indicates that the first terminal device sends the second level SCI to the second terminal device, and the second terminal device receives the PSSCH from the first terminal device according to the first level SCI and the second level SCI; wherein, The first indication information is used to indicate whether the first terminal device sends second-level side control information SCI to the second terminal device, including: The first-level SCI includes an aggregation level AL field, the AL field has at least two valid values, the at least two valid values ​​include a first valid value, the first valid value is 0, and 0 is used to indicate that the first terminal device does not send the second-level SCI to the second terminal device; and The other valid values ​​of the at least two valid values ​​except the first valid value are used to instruct the first terminal device to send the second level SCI to the second terminal device, and any one of the other valid values ​​is specifically used to indicate the aggregation level of the second level SCI.

9. The method according to claim 8, characterized in that The first indication information instructs the first terminal device not to send a second-level SCI to the second terminal device, and the second terminal device receives a PSSCH from the first terminal device according to the first-level SCI, wherein the transmission type of the PSSCH is broadcast.

10. A method for receiving side control information, characterized in that: include: The second terminal device receives the first-level side control information SCI from the first terminal device, and the cyclic redundancy check bit corresponding to the first-level SCI is scrambled by scrambling information, wherein the scrambling information includes a first identifier or a second identifier, the first identifier is used to instruct the first terminal device not to send the second-level SCI to the second terminal device, and the second identifier is used to instruct the first terminal device to send the second-level SCI to the second terminal device; The scrambling information includes a first identifier, and the second terminal device receives the PSSCH from the first terminal device according to the first level SCI; or, The scrambling information includes a second identifier, and the second terminal device receives the PSSCH from the first terminal device according to the first level SCI and the second level SCI.

11. The method according to claim 10, characterized in that The scrambling information includes a first identifier, and the second terminal device receives the PSSCH from the first terminal device according to the first-level SCI, wherein the transmission type of the PSSCH is broadcast.

12. A method for receiving side control information, characterized in that: include: The second terminal device receives the first level side control information SCI from the first terminal device; The second terminal device detects a reference signal from the first terminal device, wherein the reference signal includes a first reference signal or a second reference signal, wherein the first reference signal is used to instruct the first terminal device not to send a second level SCI to the second terminal device, and the second reference signal is used to instruct the first terminal device to send a second level SCI to the second terminal device; The reference signal includes the first reference signal, and the second terminal device receives a physical sidelink shared channel PSSCH from the first terminal device according to the first level SCI; or, The reference signal includes the second reference signal, and the second terminal device receives the PSSCH from the first terminal device according to the first level SCI and the second level SCI.

13. The method according to claim 12, characterized in that The reference signal includes the first reference signal, and the second terminal device receives the PSSCH from the first terminal device according to the first level SCI, and the transmission type of the PSSCH is broadcast.

14. The method according to claim 12 or 13, characterized in that The reference signal includes a demodulation reference signal DMRS for demodulating a sidelink physical control channel PSCCH carrying the first level SCI, the first reference signal is a first DMRS, and the second reference signal is a second DMRS.

15. A terminal device, characterized in that: include: a transceiver unit, configured to send first-level side control information SCI to a second terminal device, wherein the first-level SCI includes first indication information, and the first indication information is used to indicate whether the terminal device sends second-level side control information SCI to the second terminal device; a processing unit, configured to control the transceiver unit to send a physical sidelink shared channel PSSCH to the second terminal device according to the first level SCI, wherein the first indication information indicates that the terminal device does not send second level sidelink control information SCI to the second terminal device; or The processing unit is used to control the transceiver unit to send a PSSCH to the second terminal device according to the first level SCI and the second level SCI, wherein the first indication information indicates that the terminal device sends the second level side control information SCI to the second terminal device; wherein, The first indication information is used to indicate whether the terminal device sends second-level side control information SCI to the second terminal device, including: The first-level SCI includes an aggregation level AL field, the AL field has at least two valid values, the at least two valid values ​​include a first valid value, the first valid value is 0, and 0 is used to indicate that the terminal device does not send the second-level SCI to the second terminal device; and The other valid values ​​of the at least two valid values ​​except the first valid value are used to instruct the terminal device to send the second level SCI to the second terminal device, and any one of the other valid values ​​is specifically used to indicate the aggregation level of the second level SCI.

16. The terminal device according to claim 15, characterized in that: The first indication information instructs the terminal device not to send second-level side control information SCI to the second terminal device, and the processing unit is used to control the transceiver unit to send the PSSCH to the second terminal device according to the first-level SCI, wherein the transmission type of the PSSCH is broadcast.

17. A terminal device, characterized in that: include: a transceiver unit, configured to send first-level side control information SCI to a second terminal device, wherein a cyclic redundancy check bit corresponding to the first-level SCI is scrambled by scrambling information, wherein the scrambling information includes a first identifier or a second identifier, the first identifier is used to instruct the terminal device not to send the second-level SCI to the second terminal device, and the second identifier is used to instruct the terminal device to send the second-level SCI to the second terminal device; a processing unit, configured to control the transceiver unit to send a physical sidelink shared channel PSSCH to the second terminal device according to the first level SCI, wherein the scrambling information includes a first identifier, or The processing unit is configured to control the transceiver unit to send a physical sidelink shared channel PSSCH to the second terminal device according to the first level SCI and the second level SCI, wherein the scrambling information includes a second identifier.

18. The terminal device according to claim 17, characterized in that: The scrambling information includes a first identifier, and the processing unit is used to control the transceiver unit to send the PSSCH to the second terminal device according to the first-level SCI, wherein the transmission type of the PSSCH is broadcast.

19. A terminal device, characterized in that: include: A transceiver unit, configured to send first level side control information SCI to the second terminal device; The transceiver unit is further configured to send a reference signal to the second terminal device, the reference signal including a first reference signal or a second reference signal, wherein the first reference signal is used to instruct the terminal device not to send a second-level SCI to the second terminal device, and the second reference signal is used to instruct the terminal device to send a second-level SCI to the second terminal device; a processing unit, configured to send a physical sidelink shared channel PSSCH to the second terminal device according to the first level SCI, wherein the reference signal includes the first reference signal; or The processing unit is configured to send the PSSCH to the second terminal device according to the first level SCI and the second level SCI, wherein the reference signal includes the second reference signal.

20. The terminal device according to claim 19, characterized in that The reference signal includes the first reference signal, and the processing unit is used to control the transceiver unit to send a PSSCH to the second terminal device according to the first-level SCI, wherein the transmission type of the PSSCH is broadcast.

21. The terminal device according to claim 19 or 20, characterized in that: The reference signal includes a demodulation reference signal DMRS for demodulating a sidelink physical control channel PSCCH carrying the first level SCI, the first reference signal is a first DMRS, and the second reference signal is a second DMRS.

22. A terminal device, characterized in that: include: a transceiver unit, configured to receive a first level SCI from a first terminal device, wherein the first level SCI includes first indication information, and the first indication information is used to indicate whether the first terminal device sends a second level SCI to the terminal device; a processing unit, configured to receive a physical sidelink shared channel PSSCH from the first terminal device according to the first level SCI, wherein the first indication information indicates that the first terminal device does not send the second level SCI to the terminal device; or The processing unit is configured to receive a PSSCH from the first terminal device according to the first level SCI and the second level SCI, wherein the first indication information indicates that the first terminal device sends the second level SC to the terminal device; wherein, The first indication information is used to indicate whether the first terminal device sends second-level side control information SCI to the terminal device, including: The first-level SCI includes an aggregation level AL field, the AL field has at least two valid values, the at least two valid values ​​include a first valid value, the first valid value is 0, and 0 is used to indicate that the first terminal device does not send the second-level SCI to the terminal device; and The other valid values ​​of the at least two valid values ​​except the first valid value are used to instruct the first terminal device to send the second-level SCI to the terminal device, and any one of the other valid values ​​is specifically used to indicate the aggregation level of the second-level SCI.

23. The terminal device according to claim 22, characterized in that: The first indication information indicates that the first terminal device does not send second-level side control information SCI to the terminal device, and the processing unit is used to control the transceiver unit to send the PSSCH to the terminal device according to the first-level SCI, wherein the transmission type of the PSSCH is broadcast.

24. A terminal device, characterized in that: include: a transceiver unit, configured to receive first-level side control information SCI from a first terminal device, wherein a cyclic redundancy check bit corresponding to the first-level SCI is scrambled by scrambling information, wherein the scrambling information includes a first identifier or a second identifier, the first identifier is used to instruct the first terminal device not to send a second-level SCI to the terminal device, and the second identifier is used to instruct the first terminal device to send a second-level SCI to the terminal device; a processing unit, configured to receive a PSSCH from the first terminal device according to the first level SCI, wherein the scrambling information includes a first identifier; or The processing unit is configured to receive a PSSCH from the first terminal device according to the first level SCI and the second level SCI, wherein the scrambling information includes a second identifier.

25. The terminal device according to claim 24, characterized in that: The scrambling information includes a first identifier, and the processing unit is used to control the transceiver unit to receive the PSSCH from the first terminal device according to the first-level SCI, wherein the transmission type of the PSSCH is broadcast.

26. A terminal device, characterized in that: include: A transceiver unit, configured to receive first level side control information SCI from a first terminal device; The transceiver unit is further used to detect a reference signal from the first terminal device, wherein the reference signal includes a first reference signal or a second reference signal, wherein the first reference signal is used to instruct the first terminal device not to send a second level SCI to the terminal device, and the second reference signal is used to instruct the first terminal device to send a second level SCI to the terminal device; a processing unit, configured to receive a physical sidelink shared channel PSSCH from the first terminal device according to the first level SCI, wherein the reference signal includes the first reference signal; or The processing unit is configured to receive a PSSCH from the first terminal device according to the first level SCI and the second level SCI, wherein the reference signal includes the second reference signal.

27. The terminal device according to claim 26, characterized in that The transmission type of the PSSCH is broadcast.

28. The terminal device according to claim 26 or 27, characterized in that: The reference signal includes a demodulation reference signal DMRS for demodulating a sidelink physical control channel PSCCH carrying the first level SCI, the first reference signal is a first DMRS, and the second reference signal is a second DMRS.

29. A terminal device, characterized in that: comprising at least one processor coupled to at least one memory: The at least one processor is configured to execute a computer program or instruction stored in the at least one memory, so that the terminal device executes the method according to any one of claims 1 to 7.

30. A terminal device, characterized in that: comprising at least one processor coupled to at least one memory: The at least one processor is configured to execute a computer program or instruction stored in the at least one memory, so that the terminal device executes the method according to any one of claims 8 to 14.

31. A computer-readable storage medium, characterized in that: Used to store instructions, when the instructions are executed, the method according to any one of claims 1 to 7 is implemented.

32. A computer-readable storage medium, characterized in that: Used to store instructions, when the instructions are executed, the method according to any one of claims 8 to 14 is implemented.

33. A wireless communication system, characterized in that: It comprises the terminal device as claimed in any one of claims 15-21 and / or the terminal device as claimed in any one of claims 22-28.

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