METHOD FOR TRANSMITTING SIDE LINKS AND TERMINAL DEVICES

Description

METHOD FOR TRANSMITTING SIDE LINKS AND DEVICE TERMINAL FIELD OF TECHNIQUE

[001] The present disclosure relates to the field of communications and, in particular, to a method for side-link transmission and a terminal device. BACKGROUND

[002] To improve the transmission rate of a side-link communication system, it is possible to consider extending the frequency band of the side-link communication to high frequencies (for example, a frequency band higher than 52.6 GHz). As the frequency increases, the subcarrier spacing will increase and, consequently, the duration corresponding to a symbol will decrease. In this case, there is no suitable scheme for how side-link communication should be implemented. SUMMARY

[003] The present disclosure provides a method for side-link transmission and a terminal device. The following is an introduction to various aspects of the present disclosure.

[004] In a first aspect, a method for side link transmission is provided and includes: determining, by a first terminal device, a DMRS pattern for a first channel transmitted in a first time unit; where the first time unit includes M consecutive slots and M is a positive integer greater than 1.

[005] In a second aspect, a device Petition 870250078539, dated 03 / 09 / 2025, p. 9 / 580 2 / 241 terminal is provided, the terminal device is a first terminal device and includes: a first determination module, configured to determine a demodulation reference signal pattern (DMRS) for a first transmitted channel in a first time unit; where the first time unit includes M consecutive slots and M is a positive integer greater than 1.

[006] In a third aspect, a terminal device is provided and includes a transceiver, a memory, and a processor. The memory is configured to store a computer program, and the processor is configured to call the computer program stored in memory and control the transceiver to receive or transmit signals, to enable the terminal device to perform the method of the first aspect.

[007] In a fourth aspect, an apparatus is provided and includes a processor. The processor is configured to access a computer program from a memory, to enable the apparatus to execute the method in the first aspect.

[008] In a fifth aspect, a chip is provided and includes a processor. The processor is configured to call a computer program from memory, to allow a device equipped with the chip to execute the method in the first aspect.

[009] In a sixth aspect, a computer-readable storage medium is provided and is configured to store a computer program. The computer program enables a computer to execute the method in the first aspect. Petition 870250078539, dated 03 / 09 / 2025, page 10 / 580 3 / 241

[0010] In a seventh aspect, a computer program product is provided, and the same includes a computer program. The computer program enables a computer to execute the method in the first aspect.

[0011] In an eighth aspect, a computer program is provided. The computer program enables a computer to execute the method described in the first aspect.

[0012] In the embodiments of the present disclosure, side-link transmission or side-link reception is performed on a time-unit basis, and a time-unit includes multiple slots, thus improving the efficiency of side-link data transmission. Furthermore, the embodiments of the present disclosure provide the DMRS standard based on the time-unit, which helps to improve the data demodulation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is an example diagram of a system architecture for a wireless communication system to which the embodiments of the present disclosure can be applied.

[0014] Figure 2 is an example diagram of a side-link communication scenario within the network coverage.

[0015] Figure 3 is an example diagram of a side-link communication scenario with partial network coverage.

[0016] Figure 4 is an example diagram of a side link communication scenario outside the network coverage area.

[0017] Figure 5 is an example diagram of a Petition 870250078539, dated 03 / 09 / 2025, page 11 / 580 4 / 241 lateral link communication scenario based on a central control node.

[0018] Figure 6 is an exemplary diagram of a form of transmission-based side-link communication.

[0019] Figure 7 is an example diagram of a point-to-point broadcast-based side link communication method.

[0020] Figure 8 is an example diagram of a side-link communication method based on selective broadcasting.

[0021] Figure 9A is an example diagram of a range structure used by a side-link communication system.

[0022] Figure 9B is another example diagram of a range structure used by the side-link communication system.

[0023] Figure 10 is an example diagram of a side-link feedback scenario.

[0024] Figure 11 is a schematic diagram of time-domain demodulation (DMRS) reference signal patterns that can be used by a physical side-link shared channel (PSSCH) at a time length of 13 symbols.

[0025] Figure 12 is a schematic diagram of the frequency domain positions of the DMRSs of a physical side link control channel (PSCCH).

[0026] Figure 13 is a schematic diagram of a slot structure for transmitting a side-link synchronization signal block (S-SSB). Petition 870250078539, dated 03 / 09 / 2025, page 12 / 580 5 / 241

[0027] Figure 14 is an example diagram of a communication scenario for a wide-beam communication system.

[0028] Figure 15 is an example diagram of a communication scenario for a narrow beam communication system.

[0029] Figure 16 is a schematic flowchart of one way to use a transmission configuration indicator (TCI) state.

[0030] Figure 17 is a schematic flowchart of a side link transmission method provided in an embodiment of the present disclosure.

[0031] Figure 18A is an example diagram of a one-time-unit structure provided in embodiments of the present disclosure.

[0032] Figure 18B is another example of a diagram of a one-unit-of-time structure provided by modalities of the present disclosure.

[0033] Figure 18C is another example of a time unit diagram provided in the embodiments of the present disclosure.

[0034] Figure 18D is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0035] Figure 19A is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0036] Figure 19B is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure. Petition 870250078539, dated 03 / 09 / 2025, page 13 / 580 6 / 241

[0037] Figure 19C is another example of a time unit diagram provided in an embodiment of the present disclosure.

[0038] Figure 19D is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0039] Figure 19E is another example of a time unit diagram provided in the embodiments of the present disclosure.

[0040] Figure 19F is another example of a one-unit-of-time diagram provided in an embodiment of the present disclosure.

[0041] Figure 20 is an example of a diagram of a form of indexing for a resource allocation indication field in the time domain provided in embodiments of the present disclosure.

[0042] Figure 21 is another example of a time unit diagram provided in embodiments of the present disclosure.

[0043] Figure 22 is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0044] Figure 23 is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0045] Figure 24 is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0046] Figure 25 is another example of a time unit diagram provided in the present modalities Petition 870250078539, dated 03 / 09 / 2025, page 14 / 580 7 / 241 revelation.

[0047] Figure 26 is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0048] Figure 27 is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0049] Figure 28 is another example of a time unit diagram provided in embodiments of the present disclosure.

[0050] Figure 29 is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0051] Figure 30 is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0052] Figure 31 is another example of a time unit diagram provided in embodiments of the present disclosure.

[0053] Figure 32 is a schematic flowchart of a side link transmission method provided in another embodiment of the present disclosure.

[0054] Figure 33 is an example diagram of a form of side-link feedback provided in embodiments of the present disclosure.

[0055] Figure 34 is another example of a diagram of a form of side-link feedback provided in embodiments of the present disclosure.

[0056] Figure 35 is yet another example of a diagram of a side-link feedback loop. Petition 870250078539, dated 03 / 09 / 2025, page 15 / 580 8 / 241 provided in the manner described herein.

[0057] Figure 36 is yet another example of a diagram of a form of side-link feedback provided in embodiments of the present disclosure.

[0058] Figure 37 is yet another example of a side-link feedback mode diagram provided in embodiments of the present disclosure.

[0059] Figure 38 is a schematic flowchart of a method for side-link transmission provided in embodiments of the present disclosure.

[0060] Figure 39 is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0061] Figure 40 is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0062] Figure 41 is another example of a time unit diagram provided in embodiments of the present disclosure.

[0063] Figure 42 is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0064] Figure 43A is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0065] Figure 43B is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0066] Figure 43C is another example of a one-unit-of-time diagram provided in the modalities of Petition 870250078539, dated 03 / 09 / 2025, page 16 / 580 9 / 241 present revelation.

[0067] Figure 44A is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0068] Figure 44B is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0069] Figure 45 is another example of a time unit diagram provided in embodiments of the present disclosure. [007 0] Figure 4 6A is another example of a time unit diagram provided in the embodiment of the present disclosure.

[0071] Figure 46B is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0072] Figure 47A is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0073] Figure 47B is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0074] Figure 47C is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0075] Figure 48 is another example of a time unit diagram provided in embodiments of the present disclosure. [007 6] Figure 49A is another example of a time unit diagram provided in the modalities of Petition 870250078539, dated 03 / 09 / 2025, page 17 / 580 10 / 241 present revelation.

[0077] Figure 49B is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0078] Figure 50 is another example of a time unit diagram provided in the embodiments of the present disclosure.

[0079] Figure 51 is another example of a time unit diagram provided in embodiments of the present disclosure.

[0080] Figure 52 is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0081] Figure 53 is another example of a one-unit-of-time diagram provided in the embodiment of the present disclosure.

[0082] Figure 54 is another example of a time unit diagram provided in the embodiments of the present disclosure.

[0083] Figure 55 is another example of a time unit diagram provided in embodiments of the present disclosure.

[0084] Figure 56 is a schematic diagram of a terminal device structure provided in the embodiments of the present disclosure.

[0085] Figure 57 is a schematic diagram of a structure of an apparatus provided in embodiments of the present disclosure. DETAILED DESCRIPTION COMMUNICATION SYSTEM ARCHITECTURE Petition 870250078539, dated 03 / 09 / 2025, page 18 / 580 11 / 241

[0086] Figure 1 is an example diagram of a system architecture of a wireless communication system 100 to which embodiments of the present disclosure may be applied. The wireless communication system 100 may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120. The network device 110 may provide communication coverage for a specific geographic area and may communicate with the terminal device 120 located within the coverage area.

[0087] Figure 1 illustrates by way of example a network device and a terminal device. Optionally, the wireless communication system 100 may include one or more network devices 110 and / or one or more terminal devices 120. For a network device 110, one or more terminal devices 120 may all be located within the network coverage range of the network device 110, or may all be located outside the network coverage range of the network device 110, or may be located partially within the network coverage range of the network device 110 and partially outside the network coverage range of the network device 110, which is not limited to the embodiments of the present disclosure.

[0088] Optionally, the 100 wireless communication system may also include other network entities, such as a network controller, a mobility management entity, which is not limited to the embodiments of the present disclosure.

[0089] It must be understood that the technical solution Petition 870250078539, dated 03 / 09 / 2025, page 19 / 580 12 / 241 of the embodiments of the present disclosure may be applied to various communication systems, such as a fifth-generation (5G) system or a new radio (NR) system, a long-term evolution (LTE) system, a frequency-division duplex (FDD) LTE system, a system of LTE time-division duplex (TDD). The technical solution provided by this disclosure can also be applied to future communication systems, such as a sixth-generation (6G) mobile communication system, a satellite communication system.

[0090] In the embodiments of the present disclosure, the terminal device may also be referred to as a user equipment (UE), an access terminal, a user unit, a user station, a mobile location, a mobile station (MS), a mobile terminal (MT), a remote station, a remote terminal device, a mobile device, a user terminal, a wireless communication device, a user agent, or a user appliance. In the embodiments of the present disclosure, the terminal device may refer to a device that provides voice and / or data connectivity to a user, and may be used to connect people, objects, and machines, such as a portable device or a vehicle-mounted device with wireless connectivity.In the embodiments of the present disclosure, the terminal device may be a cell phone, a tablet computer (Pad), a laptop computer, a handheld computer, a mobile internet device (MID), a wearable device, a vehicle, a wireless terminal in industrial control, a wireless terminal in autonomous driving, a wireless terminal in remote medical surgery, or a wireless terminal in a network. Petition 870250078539, dated 03 / 09 / 2025, page 20 / 580 13 / 241 smart, a wireless terminal in transportation security, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. For example, the terminal device can act as a scheduling entity that provides side-link signals between terminal devices in vehicle-to-everything (V2X) or device-to-device (D2D) communication. For example, a cell phone and a car can communicate with each other using side-link signals. A cell phone and a smart home device can communicate with each other without relaying communication signals via a base station. Optionally, the terminal device can be configured to act as a base station.

[0091] In the embodiments of the present disclosure, the network device may be a device used to communicate with a terminal device, and the network device may also be referred to as an access network device or a wireless access network device, for example, a base station. In the embodiments of the present disclosure, the network device may refer to a radio access network (RAN) node (or device) that connects the terminal device to a wireless network. The base station may broadly encompass the following various names, or may be replaced by the following names, such as: a NodeB, an evolved NodeB (eNB), a next-generation NodeB (gNB), a relay station, an access point (AP), a transmit / receive point (TRP), a transmit point (TP), a master station (MeNB), a secondary station (SeNB), a multi-pattern radio node (MSR), a home base station, a network controller, an access node, a wireless node Petition 870250078539, dated 03 / 09 / 2025, p. 21 / 580 14 / 241 wire, an access point, a transmit node, a transceiver node, a baseband unit (BBU), a remote radio unit (RRU), an active antenna unit (AAU), a remote radio head (RRH), a central unit (CU), a distributed unit (DU), a positioning node, etc. The base station may be a macro base station, a micro base station, a relay node, a donor node, or similar entities, or a combination thereof. The base station may also refer to a communication module, a modem, or a chip configured to be installed in the aforementioned devices or equipment.The base station can also be a mobile switching center, a device that performs base station functions in device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, and machine-to-machine (M2M) communication, a network-side device in a 6G network, and a device that performs base station functions in a future communication system, etc. The base station can support networks with the same or different access technologies. The specific technologies used by the network device and the specific device forms of the network device are not limited in the embodiments of the present disclosure.

[0092] The base station can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, the helicopter or drone can be configured to act as a device that communicates with another base station.

[0093] In some deployments, the device of Petition 870250078539, dated 03 / 09 / 2025, p. 22 / 580 15 / 241 network in the embodiments of the present disclosure may refer to a CU or a DU, or the network device may include both a CU and a DU. The gNB may also include an AAU.

[0094] The network device and the terminal device can be deployed on land, which includes indoor or outdoor environments, portable or in vehicles; they can also be deployed in water; they can also be deployed on an airplane, balloons, and satellite in the air. The scenarios in which the network device and the terminal device are located are not limited to the embodiments of the present disclosure. Side link communication under different network coverage conditions.

[0095] Side-link communication refers to a communication technology based on a side link. For example, side-link communication can be device-to-device (D2D) communication or vehicle-to-everything (V2X) communication. In a traditional cellular system, communication data is received or transmitted between a terminal device and a network device, while side-link communication supports the direct transmission of communication data between terminal devices. Compared to traditional cellular communication, the direct transmission of communication data between terminal devices can have higher spectral efficiency and lower transmission delay. For example, the V2X system utilizes side-link communication technology.

[0096] In side link communication, according to the network coverage conditions of the devices Petition 870250078539, dated 03 / 09 / 2025, page 23 / 580 With 16 / 241 terminals, side-link communication can be classified into side-link communication within network coverage, side-link communication with partial network coverage, and side-link communication outside network coverage.

[0097] Figure 2 is an example diagram of a side-link communication scenario within network coverage. In the scenario illustrated in Figure 2, both terminal devices 120a are within coverage range of network device 110. Therefore, both terminal devices 120a are capable of receiving configuration signaling from network device 110 (configuration signaling may also be replaced by configuration information in the present disclosure) and determining the side-link configuration according to the configuration signaling from network device 110. After both terminal devices 120a have performed the side-link configuration, side-link communication can be performed on a side link.

[0098] Figure 3 is an example diagram of a side-link communication scenario with partial network coverage. In the scenario illustrated in Figure 3, terminal device 120a performs side-link communication with terminal device 120b. Terminal device 120a is located within the coverage range of network device 110, so terminal device 120a can receive configuration signaling from network device 110 and determine the side-link configuration according to the configuration signaling from network device 110. Terminal device 120b is located outside the Petition 870250078539, dated 03 / 09 / 2025, page 24 / 580 17 / 241 network coverage range and cannot receive the configuration signaling from network device 110. In this case, terminal device 120b can determine the side link configuration according to pre-configured information and / or information carried on a physical side link broadcast channel (PSBCH) transmitted by terminal device 120a within the network coverage range. After both terminal device 120a and terminal device 120b have performed the side link configuration, side link communication can be performed on a side link.

[0099] Figure 4 is an example diagram of a side-link communication scenario outside network coverage. In the scenario illustrated in Figure 4, two 120b terminal devices are both located outside the network coverage range. In this case, both 120b terminal devices are capable of determining the side-link configuration according to pre-configured information. After both 120b terminal devices have performed the side-link configuration, side-link communication can be performed on a side link. Lateral Link Communication Based on a Central Control Node

[00100] Figure 5 is an example diagram of a side-link communication scenario based on a central control node. In the side-link communication scenario, a plurality of terminal devices can form a communication group, and there is a central control node in the communication group. The central control node can be a terminal device in the communication group (for Petition 870250078539, dated 03 / 09 / 2025, page 25 / 580 18 / 241 example, a terminal device 1 in Figure 5), and the terminal device may also be referred to as a cluster header (CH) terminal device. The central control node may be responsible for completing one or more of the following functions: establishing a communication group, incoming and outgoing group members from the communication group, coordinating resources within the communication group, assigning side-link transmission resources to other terminal devices, receiving side-link feedback information from other terminal devices, and coordinating resources with other communication groups. SIDE LINK COMMUNICATION MODE

[00101] Some standards or protocols (such as the Third Generation Partnership Project (3GPP)) define two side-link communication modes: a first mode and a second mode.

[00102] In the first mode, a resource of a terminal device (the resource mentioned in this disclosure may also be called a transmission resource, such as a time frequency resource) is assigned by a network device. The terminal device can transmit data over the side link according to the resource assigned by the network device. The network device may assign a resource to the terminal device for a single transmission, or it may assign a resource to the terminal device for a semi-persistent transmission. The first mode can be applied to a scenario with network device coverage, such as the scenario illustrated in Figure 2 above. In the scenario illustrated in Figure 2, the terminal device 120a Petition 870250078539, dated 03 / 09 / 2025, page 26 / 580 19 / 241 is located within the network coverage range of network device 110, and therefore, network device 110 can assign a resource to terminal device 120a to be used in the side-link transmission process.

[00103] In the second mode, the terminal device can autonomously select one or more resources from a resource set (RP). The terminal device can then perform side-link transmission according to the selected resource. For example, in the scenario illustrated in Figure 4, terminal device 120b is located outside the cell coverage range. Therefore, terminal device 120b can autonomously select resources for side-link transmission from a preconfigured resource set. Alternatively, in the scenario illustrated in Figure 2, terminal device 120a can also autonomously select one or more resources for side-link transmission from a resource set configured by network device 110. METHOD OF TRANSMITTING DATA IN LATERAL LINK COMMUNICATION

[00104] Some side-link communication systems (e.g., long-term evolution vehicle-to-everything (LTE-V2X)) support a broadcast-based data transmission method (hereinafter referred to as broadcast transmission). For broadcast transmission, a receiving terminal can be any terminal device surrounding a transmitting terminal. Taking Figure 6 as an example, terminal device 1 is the transmitting terminal, and the receiving terminal corresponding to the transmitting terminal is any terminal device surrounding terminal device 1, such as Petition 870250078539, dated 03 / 09 / 2025, page 27 / 580 20 / 241 a terminal device 2 to a terminal device 6 in Figure 6.

[00105] In addition to broadcast transmission, some communication systems also support a form of point-to-point broadcast-based data transmission (hereinafter referred to as point-to-point broadcast transmission) and / or a form of selective broadcast-based data transmission (hereinafter referred to as selective broadcast transmission). For example, the new vehicle-for-everything radio (NRV2X) aims to support autonomous driving. Autonomous driving imposes higher requirements on data interaction between vehicles. For example, data interaction between vehicles requires higher throughput, lower latency, greater reliability, a greater coverage range, a more flexible resource allocation method, etc. Therefore, to improve the performance of data interaction between vehicles, the NR-V2X introduces point-to-point broadcast transmission and selective broadcast transmission.

[00106] For point-to-point broadcast transmission, the receiving terminal usually has only one terminal device. Taking Figure 7 as an example, point-to-point broadcast transmission is performed between a terminal device 1 and a terminal device 2. Terminal device 1 can be a transmitting terminal, and terminal device 2 can be a receiving terminal, or terminal device 1 can be a receiving terminal, and terminal device 2 can be a transmitting terminal.

[00107] For selective broadcast transmission, the receiving terminal can be a terminal device within a communication group, or the receiving terminal can be a Petition 870250078539, dated 03 / 09 / 2025, page 28 / 580 21 / 241 terminal device within a certain transmission distance. Taking Figure 8 as an example, a terminal device 1, a terminal device 2, a terminal device 3, and a terminal device 4 constitute a communication group. If terminal device 1 transmits data, other terminal devices (terminal device 2 to terminal device 4) in the communication group can all be receiving terminals. SIDE LINK COMMUNICATION SLOT STRUCTURE

[00108] A communication system can define a frame, a subframe, or a slot structure for side-link communication. Some side-link communication systems define multiple slot structures. For example, an NR-based side-link communication system (NR SL) defines two slot structures. One of the two slot structures does not include a physical side-link feedback channel (PSFCH), as illustrated in Figure 9A; the other of the two slot structures includes the PSFCH, as illustrated in Figure 9B.

[00109] A physical side link control channel (PSCCH) in NR SL can assume the second side link symbol of the slot as a starting position in the time domain, and the PSCCH can occupy 2 or 3 symbols in the time domain (the symbols mentioned here may refer to orthogonal frequency division multiplexing (OFDM) symbols). The PSCCH can occupy a plurality of physical resource blocks (PRBs) in the frequency domain. For example, the number of PRBs occupied by the PSCCH can be selected from the following values: {10, 12, 15, 20, 25}. Petition 870250078539, dated 03 / 09 / 2025, page 29 / 580 22 / 241

[00110] In order to reduce the complexity of blind detection performed by a terminal device in the PSCCH, generally, only a number of symbols and a number of PRBs are configured for the PSCCH in a resource set. Furthermore, since NR SL uses a subchannel as the minimum granularity for resource allocation of the physical side link shared channel (PSSCH), the number of PRBs occupied by the PSCCH must be less than or equal to the number of PRBs included in a subchannel in the resource set.

[00111] As illustrated in Figure 9A, for a slot structure that does not include the PSFCH, a PSSCH in the NR SL can take the second side-link symbol of the slot as a starting position in the time domain. The last side-link symbol in the slot is used as a guard period (GP), and the remaining symbols can map the PSSCH, where the guard period can also be referred to as a guard symbol. The first side-link symbol in the interval can be a repetition of the second side-link symbol. Generally, a terminal device such as a receiver uses the first side-link symbol as a symbol to perform automatic gain control (AGC). Therefore, the data transmitted on the first side-link symbol is generally not used for data demodulation. PSSCH can occupy K subchannels in the frequency domain, and each subchannel can include M consecutive PRBs (the values ​​of K and M can be predefined by a protocol, or preconfigured, or configured by the network device, or depend on the implementation of the terminal device.

[00112] Figure 9B illustrates an interval structure including the PSFCH, and Figure 9B illustrates Petition 870250078539, dated 03 / 09 / 2025, page 30 / 580 Figure 9B schematically shows the symbol positions occupied by PSFCH, PSCCH, and PSSCH in a slot. The main difference between the slot structure in Figure 9B and the slot structure in Figure 9A is that the second-to-last symbol and the third-to-last symbol in the slot in Figure 9B are used to transmit PSFCH, and, in addition, a symbol preceding the symbol used to transmit PSFCH is also used as a GP (or guard symbol). It can be seen in the slot structure illustrated in Figure 9B that in a slot, the last symbol is used as GP, a second-to-last symbol is used for PSFCH transmission, and the data transmitted in the third-to-last symbol is the same as the data of the second-to-last symbol used for PSFCH transmission; that is, the third-to-last symbol is used as a symbol to perform the AGC, and the fourth-to-last symbol has the same function as the last symbol and is also used as GP.Furthermore, the first symbol in the slot is used as AGC, the data transmitted in the first symbol is the same as the data transmitted in the second symbol in the slot, PSCCH occupies 3 symbols and the remaining symbols are available for PSSCH transmission. PSFCH TRANSMISSION RESOURCE

[00113] To reduce PSFCH overhead, some communication systems define that one slot in every N slots includes a PSFCH transmission resource (or so-called side-link feedback resource). That is, one period of the side-link feedback resource is N slots. For example, a value of N can be 1, 2, or 4. The parameter N mentioned here can be pre-configured or can be configured by the network device.

[00114] Figure 10 illustrates a scenario of Petition 870250078539, dated 03 / 09 / 2025, page 31 / 580 24 / 241 side link feedback corresponding to the value of N being 4. As illustrated in Figure 10, the PSSCH side link feedback information transmitted in slots 1, 2, 3, and 4 is all transmitted in slot 7. Therefore, the time slots {1, 2, 3, 4} can be considered as a set of time slots, and a PSSCH corresponding to the PSSCH transmitted in each time slot of the set of time slots is located in the same time slot.

[00115] If a transmitting device (i.e., a terminal device acting as a transmitter) transmits PSCCH / PSSCH in slot n, a receiving device (i.e., a terminal device acting as a receiver) transmits PSFCH in the first available slot after slot n+k. The k mentioned here is a configuration parameter. The value of k can be 2 or 3. For example, in Figure 10, if the network device configures k=2, the transmitting device transmits PSCCH / PSSCH in slot 4, and the receiving device transmits PSFCH in the first available slot after slot 6, i.e., the receiving device transmits PSFCH in slot 7. DMRS STRUCTURE OF PSCCH AND PSSCH

[00116] PSSCH supports a plurality of DMRS time-domain patterns. Table 1 illustrates the definition of the DMRS time-domain PSSCH pattern provided by some communication systems (e.g., the NR SL system). As illustrated in Table 1, within a feature set, if the number of PSSCH symbols (the number of PSSCH symbols includes the first symbol used as AGC, but the number of PSSCH symbols does not include the last symbol) Petition 870250078539, dated 03 / 09 / 2025, page 32 / 580 If the number of PSSCH symbols (25 / 241 used as GP, a PSFCH symbol, an AGC symbol, and a GP symbol preceding the PSFCH symbol) is greater than or equal to 11, a maximum of three different DMRS patterns in the time domain can be configured. The three DMRS patterns in the time domain are, respectively, a DMRS pattern in the time domain including 2 DMRS symbols, a DMRS pattern in the time domain including 3 DMRS symbols, and a DMRS pattern in the time domain including 4 DMRS symbols. If the number of PSSCH symbols is 6, 7, or 8, only the DMRS pattern in the time domain including 2 DMRS symbols can be configured for the PSSCH. If the number of PSSCH symbols is 9 or 10, the DMRS pattern in the time domain including 2 or 3 DMRS symbols can be configured for the PSSCH. If the number of PSSCH symbols is 11, 12, or 13, the DMRS time-domain pattern, including 2 DMRS symbols, 3 DMRS symbols, or 4 DMRS symbols, can be configured for PSSCH.

[00117] Table 1 illustrates the symbol positions corresponding to the PSSCH DMRS with different numbers of symbols in a case where the PSCCH occupies 2 symbols and 3 symbols, respectively. It can be seen in Table 1 that the number of PSSCH symbols is greater than or equal to 6. That is, the number of symbols available for PSSCH transmission in a slot (not including GP symbols) must be greater than or equal to 6.

[00118] If a plurality of DMRS time-domain standards are configured in the feature set, the specific DMRS time-domain standard to be used is selected by the transmitting device and indicated in a first-stage SCI. TABLE 1: NUMBER AND POSITION OF DMRS SYMBOLS WITH A DIFFERENT NUMBER OF PSSCH SYMBOLS AND PSCCH SYMBOLS Petition 870250078539, dated 03 / 09 / 2025, page 33 / 580 26 / 241 The number of PSSCH symbols DMRS symbol position (relative to the first symbol available for PSSCH transmission) The number of PSCCH symbols is 2 The number of PSCCH symbols is 3 The number of DMRS symbols The number of DMRS symbols 2 3 4 2 3 4 6 1, 5 1, 5 7 1, 5 1, 5 8 1, 5 1, 5 9 3, 8 1, 4, 7 4, 8 1, 4, 7 10 3, 8 1, 4, 7 4, 8 1, 4, 7 11 3, 10 1, 5, 9 1, 4, 7, 10 4, 10 1, 5, 9 1, 4, 7, 10 12 3, 10 1, 5, 9 1, 4, 7, 10 4, 10 1, 5, 9 1, 4, 7, 10 13 3, 10 1, 6, 11 1, 4, 7, 10 4, 10 1, 6, 11 1, 4, 7, 10

[00119] Figure 11 illustrates a DMRS pattern in the time domain that can be used by a PSSCH over a time length of 13 symbols. In a case where the number of PSSCH symbols is 13, if the GP symbol is added, all 14 symbols in a slot are available for side-link transmission. In the frequency domain, in any PRB on a symbol that includes a DMRS, every two subcarriers include a subcarrier carrying a DMRS. For example, in a PRB, the PSSCH DMRS is located on subcarriers {#0, #2, #4, #6, #8, #10} in the PRB.

[00120] In the time domain, the PSCCH DMRS exists on all symbols occupied by the PSCCH. In the frequency domain, a PRB includes three subcarriers to carry the PSCCH DMRS. For example, the PSCCH DMRS is Petition 870250078539, dated 03 / 09 / 2025, page 34 / 580 27 / 241 located on subcarriers {#1, #5, #9} in a PRB, as illustrated in Figure 12. PSBCH AND DMRS STRUCTURE OF PSBCH

[00121] An S-SSB in a side-link communication system (e.g., NR SL) includes a side-link synchronization signal and a PSBCH, and the side-link synchronization signal is split into a primary side-link synchronization signal (S-PSS) and a secondary side-link synchronization signal (S-SSS). The SSSB may also be referred to as an S-SS / PSBCH block.

[00122] In the time domain, S-PSS occupies the second and third symbols in a slot. S-SSS occupies the fourth and fifth symbols in a slot. The last symbol in a slot is GP (or guard symbol), and the remaining symbols are used to transmit PSBCH. SPSS and S-SSS are consecutive in the time domain, and therefore a channel estimation result obtained based on S-PSS can be applied to S-SSS detection, which is beneficial for improving S-SSS detection performance.

[00123] In the frequency domain, the PSBCH occupies 11 consecutive PRBs, that is, 132 subcarriers (each PRB includes 12 subcarriers). The length of each of the S-PSS and S-SSS is 127 and, therefore, in the symbols where the S-PSS and S-SSS are located, subcarriers #0, #1, #129, #130 and #131 are defined as zero, as illustrated in Figure 13.

[00124] A DMRS PSBCH is included in each symbol occupied by the PSBCH, and the DMRS PSBCH is mapped to a subcarrier #0, a subcarrier #4, and a subcarrier #8 in a resource block (RB) occupied by each PSBCH. Petition 870250078539, dated 03 / 09 / 2025, page 35 / 580 28 / 241 MULTIPLE BEAM SYSTEM

[00125] A design objective of a communication system (e.g., the NR system) includes high-bandwidth communication in a high-frequency band (e.g., a frequency band above 6 GHz). In a case where the operating frequency becomes higher, path loss during a transmission process will increase, thus affecting the coverage capacity of a high-frequency system. Therefore, to effectively guarantee the coverage range of the high-frequency band, an effective technical solution is to form a shaped beam with higher gain based on massive multiple inputs and multiple outputs (massive MIMO), to overcome propagation loss and guarantee the coverage range of the communication system.

[00126] Currently, the most common massive MIMO is the millimeter wave antenna array. Because the wavelength emitted by the millimeter wave antenna array is shorter, the spacing between the antenna elements of the array can be shorter and the antenna element aperture can be smaller, and thus more physical antenna elements can be integrated into a two-dimensional antenna array of limited size.

[00127] Furthermore, due to the limited size of the millimeter wave antenna array, digital beamforming cannot be employed considering factors such as hardware complexity, cost overhead, and power consumption. Instead, analog beamforming is generally used, which can improve network coverage while reducing the complexity of implementing a device. Petition 870250078539, dated 03 / 09 / 2025, page 36 / 580 29 / 241

[00128] To facilitate understanding of the multibeam system, taking as an example a communication scenario between the network device and the terminal device, a beam-based communication process will be described below in conjunction with Figures 14 and 15.

[00129] With reference to Figure 14, in a traditional communication system (e.g., a 2G, 3G, or 4G system), a wider beam 1010 is generally used to cover an entire cell (or “sector”). In this way, terminal devices (e.g., terminal devices 1 to 5) within the cell can communicate with the network device via the wider beam at each point in time, for example, to obtain transmission resources allocated by the network device.

[00130] With reference to Figure 15, in a more recent communication system (e.g., a 5G or NR system), a 1510 multibeam system can be used to cover an entire cell. In other words, each beam in the multibeam system (e.g., beams 1511 to 1514) covers a smaller swath in the cell, and the effect of a plurality of beams covering the entire cell is achieved in a beam-scanning manner.

[00131] During a beam scanning process, different beams are used at different points in time to cover different areas within the cell. For example, at time point 1, the communication system might cover an area where terminal device 1 is located using beam 1511. At time point 2, the communication system might cover an area where terminal device 2 is located using beam Petition 870250078539, dated 03 / 09 / 2025, page 37 / 580 30 / 241 1512. At a time point 3, the communication system can cover an area in which a terminal device 3 and a terminal device 4 are located by means of a beam 1513. At a time point 4, the communication system can cover an area in which a terminal device 5 is located by means of a beam 1514.

[00132] For the multibeam system, since a narrower beam is used, the transmitted energy can be more focused and therefore a greater distance will be covered. However, as the beam is relatively narrow, each beam can only cover a partial area within the cell and therefore a beam scanning process of the multibeam system can be understood as a time-for-space exchange.

[00133] Analog beamforming can be employed not only in the network device, but also in the terminal device. Furthermore, analog beamforming can be employed not only for transmitting signals (called transmit beams), but also for receiving signals (called receive beams).

[00134] Currently, different beams are identified by different signals carried in the beams. For example, different physical transmission channel and synchronization signal blocks (PBCHs) (SSBs) can be transmitted in different beams, and therefore the terminal device can distinguish different beams by means of different SSBs. As another example, different channel state information reference signals (CSI-RSs) can be transmitted in different beams, and therefore the terminal device can identify different beams by Petition 870250078539, dated 03 / 09 / 2025, page 38 / 580 31 / 241 means of CSI-RSs and / or CSI-RS resources.

[00135] In a multi-beam system, a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) can be transmitted via different downlink transmission beams.

[00136] For some communication systems (for example, communication systems with carrier frequencies below 6 GHz), an analog beam is generally not used by the terminal device. In such communication systems, the terminal device may use an omnidirectional antenna (or a near-omnidirectional antenna) to receive signals transmitted by different downlink transmission beams from the network device.

[00137] For some communication systems (e.g., millimeter wave systems), the analog beam may be used by the terminal device. In such communication systems, the terminal device may use a downlink receiving beam to receive a signal transmitted via a corresponding downlink transmitting beam. In this case, the beam indication information may be used to help the terminal device determine one or more of the following: relevant information from a transmitting beam of the network device and relevant information from a receiving beam corresponding to the terminal device.

[00138] In some communication protocols (e.g., NR-related protocols), the beam itself is not directly indicated by the beam indication information, but is indicated by means of quasi-co-located (QCL) between the Petition 870250078539, dated 03 / 09 / 2025, p. 39 / 580 32 / 241 signals. On the terminal device side, the determination of receiving a corresponding channel / signal is also based on a QCL assumption.

[00139] The transmission beam mentioned in the embodiments of the present disclosure may also be referred to as a spatial domain transmission filter, spatial domain transmission filter for transmission, spatial domain transmission filter for transmission, or other names. Similarly, the reception beam mentioned in the embodiments of the present disclosure may also be referred to as a spatial domain reception filter, spatial domain transmission filter receiver, spatial domain transmission filter for reception, or other names. Alternatively, the transmission beam mentioned in the embodiment of the present disclosure may also be referred to as a spatial domain transmission parameter. Likewise, the reception beam mentioned in the embodiments of the present disclosure may also be referred to as a spatial domain reception parameter. QCL INDICATION / ASSUMPTION FOR DOWNLINK TRANSMISSION

[00140] To improve reception performance, when receiving a signal, the terminal device can improve a reception algorithm using a characteristic of the transmission environment corresponding to the data transmission. For example, a channel estimator design and parameter can be optimized by the terminal device using a statistical characteristic of the channel. In some communication systems (e.g., NR systems), the characteristics of the environment of Petition 870250078539, dated 03 / 09 / 2025, p. 40 / 580 33 / 241 transmission corresponding to data transmission can be represented by QCL information (QCL-Info).

[00141] In cases where different transmit and receive points (TRPs) / panels / beams are used for downlink data transmission, the characteristics of the transmission environment corresponding to the data transmission may also change. Therefore, in some communication systems (e.g., NR systems), in cases where a downlink control channel or a downlink data channel needs to be transmitted, the network device may indicate the corresponding QCL information to the terminal device via a transmission configuration indicator (TCI) state.

[00142] A TCI state can include the following configuration information: a TCI state identity (ID), QCL 1 information, and QCL 2 information (optional). The TCI state ID can be used to identify the TCI state.

[00143] QCL information may include the following information: QCL type configuration and QCL reference signal configuration. The QCL type configuration may be one of QCL-Type A, QCL-Type B, QCL-Type C, or QCL-Type D. The QCL reference signal configuration may include a cell ID in which the reference signal is located, a bandwidth portion (BWP), and a reference signal ID (such as a CSI-RS resource ID or an SSB index).

[00144] If both QCL 1 and QCL 2 information are configured, the QCL type of at least one of the QCL 1 and QCL 2 information must be one of the QCL types A, B, or C, and the QCL type of the other Petition 870250078539, dated 03 / 09 / 2025, p. 41 / 580 34 / 241 QCL information needs to be of QCL type D.

[00145] Definitions of different QCL type configurations are as follows.

[00146] QCL-Type A: {Doppler shift, Doppler spread, mean delay, delay spread}

[00147] QCL-Type B: {Doppler Shift, Doppler scattering

[00148] QCL-Type C: {Doppler shift, mean delay}

[00149] QCL-Type D: {spatial domain reception parameter}.

[00150] In the NR system, the network device can indicate a corresponding TCI state for a downlink signal or a downlink channel. If the network device configures, through the TCI state, a QCL reference signal of a target downlink channel or a target downlink signal such as the SSB or the CSI-RS, and the QCL type is configured for QCL-Type A, the In QCL-Type B or QCL-Type C, the terminal device can assume that a large-scale parameter of the target downlink signal is the same as that of SSB or CSI-RS. The specific content of the large-scale parameter can be determined based on the QCL type configuration.

[00151] Similarly, if the network device configures, via the TCI state, the QCL reference signal of the target downlink channel or downlink signal for SSB or CSI-RS, and the QCL type is set to QCL-Type D, the terminal device can use the same receive beam as for receiving SSB or CSI-RS (i.e., the same domain receive parameter). Petition 870250078539, dated 03 / 09 / 2025, p. 42 / 580 35 / 241 spatial (spatial Rx parameter)) to receive the target downlink signal. Generally, on the network device side, the target downlink channel (or target downlink signal) and the SSB or CSI-RS to which the target downlink channel refers can be transmitted by the same TRP / panel / beam. If TRPs / panels / beams for transmitting two downlink signals (or downlink channels) are different, different TCI states are usually configured for the two downlink signals (or downlink channels).

[00152] For a downlink control channel, a TCI state of a control resource set (CORESET) corresponding to the downlink control channel may be indicated by RRC signaling or RRC signaling plus medium access control (MAC) signaling.

[00153] For the downlink data channel (i.e., the PDSCH), as illustrated in Figure 16, a set of TCI states available for the downlink data channel can be indicated via RRC signaling, and some of the TCI states can be activated via MAC layer signaling. Finally, one or two TCI states are indicated from activated TCI states via the TCI state indication field in the DCI for a downlink data channel scheduled by the DCI. NEW FREQUENCY BAND (HIGH FREQUENCY) FOR THE COMMUNICATION SYSTEM

[00154] Research in some communication systems (e.g., NR systems) currently considers Petition 870250078539, dated 03 / 09 / 2025, page 43 / 580 36 / 241 primarily the following two frequency bands: frequency band 1 (FR1) and frequency band 2 (FR2). The frequency bands included in FR1 and FR2 are illustrated in Table 2 below. TABLE 2: DEFINITION OF THE FREQUENCY BANDS CORRESPONDING TO FR1 AND FR2 Frequency band definition: Corresponding frequency range: FR1 410 MHz - 7.125 GHz; FR2 24.25 GHz - 52.6 GHz

[00155] With the evolution of communication systems (e.g., NR systems), technologies in new frequency bands (generally called high frequency) have also begun to be studied. The frequency of the new frequency band mentioned here may be higher than FR1 and FR2 and, for example, may include the frequency range illustrated in Table 3 below. TABLE 3: A POSSIBLE DEFINITION OF THE NEW FREQUENCY BAND Frequency band definition: Corresponding frequency range FRX 52.6 GHz - 71 GHz

[00156] FRX used here represents the new frequency band, which serves only to distinguish it from FR1 and FR2, and is not intended to limit the name of the new frequency band. For example, FRX may also be referred to as FR3. As another example, FR2 in Table 2 above may be Petition 870250078539, dated 03 / 09 / 2025, p. 44 / 580 37 / 241 recorded as FR2-1, and FRX in Table 3 can be recorded as FR2-2. It is clear that, in addition to the two methods listed above, other methods can be used to identify the new frequency band, which are not limited to the modalities of the present disclosure.

[00157] The FRX frequency band may include licensed and unlicensed spectrum. In other words, the FRX frequency band may include both shared and non-shared spectrum. The non-licensed spectrum mentioned here is generally spectrum allocated by a country or region available for communication by radio devices, and the shared spectrum is generally considered spectrum shared by communication devices in different communication systems. That is, as long as the communication device in different communication systems meets the regulatory requirements established by the country or region on the spectrum, the spectrum may be used without the need to request an exclusive spectrum authorization from the government.In order to allow various communication systems that use unlicensed spectrum for wireless communication to coexist amicably in that spectrum, some countries or regions have stipulated regulatory requirements that must be met to use unlicensed spectrum. For example, the communication device follows the listen-before-speak (LBT) principle, meaning that before the communication device transmits a signal on an unlicensed spectrum channel, it must first listen to the channel. Only when the result of the channel listening shows that the channel is idle can the communication device transmit the signal. Petition 870250078539, dated 03 / 09 / 2025, page 45 / 580 38 / 241 If the channel listening result by the communication device on the unlicensed spectrum channel indicates that the channel is occupied, the communication device cannot transmit the signal. As another example, in order to ensure fairness in a transmission, the duration that the communication device uses the unlicensed spectrum channel to transmit the signal cannot exceed a certain duration. As another example, in order to prevent the power of the signal transmitted on the unlicensed spectrum channel from being too high and affecting the transmission of other important signals on the channel, the communication device needs to comply with the restriction of not exceeding the maximum power spectral density when using the unlicensed spectrum channel for signal transmission.

[00158] An FRX frequency band subcarrier spacing may be larger than an FR2 subcarrier spacing. Currently, candidate FRX frequency band subcarrier spacings may include one or more of the following: 120 kHz, 240 kHz, 480 kHz, 960 kHz, 1.92 MHz, and 3.84 MHz. Taking the 120 kHz, 480 kHz, and 960 kHz subcarrier spacings as examples, the corresponding numerology under the above candidate subcarrier spacings is illustrated in Table 4 below. TABLE 4: NUMEROLOGY CORRESPONDING TO SPACING OF CANDIDATE SUBCARRIERS Petition 870250078539, dated 03 / 09 / 2025, page 46 / 580 39 / 241 Subcarrier spacing Symbol length Normal cyclic prefix (NCP) length Extended cyclic prefix (ECP) length Sum of symbol length and NCP length Slot length 120 kHz 8.32 μs 0.586 μs 2.08 μs 8.906 μs 125 μs 480 kHz 2.08 μs 0.146 μs 0.52 μs 2.226 μs 31.25 μs 960 kHz 1.04 μs 0.073 μs 0.26 μs 1.113 μs 15.625 μs

[00159] To improve the transmission rate of the side-link communication system, it is possible to consider introducing a new frequency band into the side-link communication system. The new frequency band may refer to a millimeter wave frequency band. Alternatively, the new frequency band may refer to a frequency band with a frequency higher than 52.6 GHz, for example, the FRX (or FR2-2) frequency band with a frequency range between 52.6 GHz and 71 GHz.

[00160] The subcarrier spacing supported in different frequency bands may be different. For example, FR1 may support subcarrier spacing of 15 kHz, 30 kHz, and 60 kHz. FR2-1 may support subcarrier spacing of 60 kHz and 120 kHz. FRX may support subcarrier spacing of 120 kHz and above, as well as FRX may support subcarrier spacing of 120 kHz, 480 kHz, and 960 kHz.

[00161] The related technique defines a groove structure corresponding to the following Petition 870250078539, dated 03 / 09 / 2025, page 47 / 580 40 / 241 subcarrier spacings: 15 kHz, 30 kHz, 60 kHz, and 120 kHz. However, in a case where the subcarrier spacing is greater than 120 kHz, such as when the subcarrier spacing reaches 480 kHz and 960 kHz, it has not yet been discussed how the slot structure of the side link communication system should be designed.

[00162] In view of the above problems, a possible solution for the slot structure design is to continue using the slot structure illustrated in Figure 9A and Figure 9B. However, careful study will reveal that if the slot structure illustrated in Figure 9A and Figure 9B continues to be used, the communication process will be difficult to implement. The specific reasons are discussed as follows.

[00163] As illustrated in Figure 9A or Figure 9B, in a side-link communication slot, the first symbol is usually an AGC symbol for the receiving device to perform AGC adjustment or AGC training; the last symbol is used as GP, which is usually used for RX / TX switching or TX / RX switching of the terminal device. If the subcarrier spacing is different, the duration corresponding to a symbol is different. For example, in a case where the subcarrier spacing is 15 kHz, the duration corresponding to a symbol is approximately 66.7 µs. If the 4.69 µs duration corresponding to the cyclic prefix (CP) is added, in a case where the subcarrier spacing is 15 kHz, the total duration of a symbol is approximately 71 µs to 72 µs. For example, in a case where the subcarrier spacing is 120 kHz, the total duration of a symbol (a sum of the symbol and the length of the Petition 870250078539, dated 03 / 09 / 2025, page 48 / 580 41 / 241 The CP) is approximately 8 us to 9 us. Therefore, in a case where the subcarrier spacing is 120 kHz, the AGC adjustment time does not exceed 8 us to 9 us, and a receive-to-transmit conversion time or a transmit-to-receive conversion time of the terminal device is about 7 us.

[00164] The duration corresponding to the conversion time in FR1 and FR2 (which may include FR2-1 and FR22) can be determined based on Table 5 below. TABLE 5: RECEPTION-TRANSMISSION CONVERSION TIME AND TRANSMISSION-RECEPTION CONVERSION TIME First frequency band (FR1) Second frequency band (FR2) Transmission-reception conversion time 25600 13792 Reception-transmission conversion time 25600 13792

[00165] The values ​​in Table 5 represent the number of time units. The duration corresponding to one time unit can be determined by the following equation: Tc= 1 / (úfmaxNj), where Δ / max = 480 · 103Hz, N = 4096.

[00166] If the subcarrier spacing is greater than 120 kHz, the duration corresponding to a symbol will continue to decrease. For example, in a case where the side link system subcarrier spacing is 480 kHz, the duration of a symbol is approximately 2 µs to 3 µs (as illustrated in Table 4); in a case where the side link system subcarrier spacing is 960 kHz, the duration of a symbol is approximately 1 µs Petition 870250078539, dated 03 / 09 / 2025, page 49 / 580 42 / 241 (as illustrated in Table 4). It can be seen that as the frequency increases, the duration corresponding to a symbol can be very short, making it difficult for the terminal device to complete the AGC adjustment, the receive-to-transmit conversion, or the transmit-to-receive conversion in such a short time. Therefore, more symbols are needed for AGC adjustment and receive-to-transmit conversion (or transmit-to-receive conversion). However, if a plurality of symbols is used as AGC or GP, the number of symbols used for side-link data transmission becomes relatively small, thus greatly reducing the transmission efficiency of the communication system.

[00167] In response to the above problems, the embodiments of the present disclosure propose a time unit available for side-link transmission (see Embodiment 1 for details). The time unit may include a plurality of slots, thus alleviating the problem caused by the short duration corresponding to the symbol to a certain extent. For ease of description, the following content mainly introduces the perspective of a first time unit. The first time unit can be any time unit used for side-link communication. As illustrated in Figure 17, based on the introduction of the first time unit, a first terminal device can perform side-link communication (e.g., side-link transmission or side-link reception, as illustrated in step S1710 of Figure 17) in the first time unit.The side-link communication process may involve the transmission of one or more PSSCH, PSCCH, or PSFCH signals. Petition 870250078539, dated 03 / 09 / 2025, page 50 / 580 43 / 241 Therefore, the embodiments of the present disclosure further propose how to perform PSSCH transmission based on the time unit (see Embodiment 2 for details) and how to determine the transport block size (TBS) (see Embodiment 3 for details), how to perform lateral feedback based on the time unit (see Embodiment 4 for details), how to determine the PSFCH transmission feature and PSFCH configuration information (see Embodiment 5 for details), and how to determine the DMRS pattern based on the time unit (see Embodiment 6 for details). It should be understood that, in the absence of conflict, the implementations provided by these embodiments may be arbitrarily combined with each other. MODE 1: A FIRST UNIT OF TIME INCLUDING CONSECUTIVE M SLOTS

[00168] The first time unit may include M consecutive slots (M is a positive integer greater than 1). The first time unit may also be understood as a slot structure based on a plurality of slots. In some implementations, the first time unit may be called an aggregate slot, slot aggregation, super slot, slot group, or multiple slot or multislot.

[00169] In some implementations, a value of M can be determined based on one or more of the following: predefined information in a protocol; configuration information from the resource set; configuration information from the side link BWP; or information indicating a terminal device. The terminal device can be a link data transmission device. Petition 870250078539, dated 03 / 09 / 2025, page 51 / 580 44 / 241 lateral or it could be a side link data receiver device.

[00170] In some implementations, M slots included in a first time unit are M consecutive physical slots. The physical slots are referred to in relation to the logical slots. Generally, a slot belonging to a set of resources is called a logical slot, and the 10240 · 2^SL slots included in a system frame number (SFN) period (including 10240 ms) are called physical slots, and μ^ is a parameter related to the side link subcarrier spacing, and a value of μSL can be determined based on Table 6. TABLE 6 hSL Subcarrier spacing 4f = 2μ-15 [kHz] 0 15 1 30 2 60 3 120 5 480 6 960

[00171] Consecutive slots in a resource set may not be consecutive physical slots. If M consecutive slots are defined as the M consecutive slots in a resource set, the middle of the M slots may include slots belonging to other resource sets. Thus, in a case where the terminal device uses the M slots for transmission, it may need Petition 870250078539, dated 03 / 09 / 2025, page 52 / 580 45 / 241 perform reception in slots belonging to other resource pools, resulting in additional GP overhead for receive-to-transmit conversion. Therefore, defining the M slots as M consecutive physical slots can reduce the GP overhead caused by receive-to-transmit conversion.

[00172] In some implementations, the M slots included in an initial time unit are consecutive slots available for side-link transmission (the slots in a resource set are determined from the slots available for side-link transmission).

[00173] In some implementations, a first-time unit may include a PSCCH transmission feature and a PSSCH transmission feature. Alternatively, the first time unit may include the PSCCH transmission feature, the PSSCH transmission feature, and the PSFCH transmission feature. The following uses of each symbol in the first time unit are illustrated with reference to Figure 18 and Figure 19. In the first time unit illustrated in Figure 18 and Figure 19, the first symbol used to transmit the PSCCH or PSSCH is located in the (A+1)-th symbol in the first time unit, i.e., the first A symbols in the first time unit are AGC symbols that are available for AGC tuning or AGC training, and the last B1 symbols in the first time unit are guard symbols or GP symbols.

[00174] Figure 18A illustrates an example of an initial time unit. In Figure 18A, the first time unit includes 2 slots (slot n and slot (n+1) in Figure 18A). Petition 870250078539, dated 03 / 09 / 2025, page 53 / 580 46 / 241, that is, M equals 2. In the 2 intervals, the first 4 symbols are used as AGC and the last 4 symbols are used as GP. The first time unit using the slot structure illustrated in Figure 18A, for example, can be applied to the case where the side-link subcarrier spacing is 480 kHz.

[00175] Figure 18B illustrates another example of the first time unit. In Figure 18B, the first time unit includes 2 slots (slot n and slot (n + 1) in Figure 18B), that is, M equals 2. In the 2 intervals, the first 8 symbols are used as AGC and the last 8 symbols are used as GP. The first time unit using the slot structure illustrated in Figure 18B, for example, can be applied to the case where the side link subcarrier spacing is 480 kHz or 960 kHz.

[00176] Figure 18C illustrates another example of a first-time unit. In Figure 18C, the first time unit includes 2 slots (slot n and slot (n + 1) in Figure 18C), i.e., M equals 2. In the 2 time intervals, the first 4 symbols are used as AGC and the last 4 symbols are used as GP. The first time unit also includes a PSFCH transmission feature. The PSFCH transmission feature occupies 5 symbols, one of which is used to transmit side-link feedback information (e.g., Hybrid Automatic Repeat Request (HARQ) information) or conflict indication information, and the remaining 4 symbols are used as AGC. Additionally, 4 symbols used as GP are included before the symbol corresponding to the PSFCH transmission feature. The first time unit uses the slot structure. Petition 870250078539, dated 03 / 09 / 2025, page 54 / 580 The 47 / 241 pattern illustrated in Figure 18C, for example, can be applied to the case where the side-link subcarrier spacing is 480 kHz.

[00177] Figure 18D illustrates another example of a first-time unit. In Figure 18D, the first time unit includes 2 slots (slot n and slot (n+1) in Figure 18D), i.e., M equals 2. In the 2 slots, the first 4 symbols are used as AGC and the last 4 symbols are used as GP. The first-time unit also includes the PSFCH transmission feature. The PSFCH transmission feature occupies 6 symbols, 2 of which are used to transmit side-link feedback information (e.g., HARQ information) or conflict indication information, and the remaining 4 symbols are used as AGC. In addition, 4 symbols used as GP are included before the symbol corresponding to the PSFCH transmission feature. The first time unit using the slot structure illustrated in Figure 18D, for example, can be applied to the case where the side-link subcarrier spacing is 480 kHz.

[00178] Figure 19A illustrates yet another example of a first-time unit. In Figure 19A, the first-time unit includes 4 slots (i.e., slot n, slot (n+1), slot (n+2), and slot (n+3) in Figure 19A), i.e., M equals 4. In the 4 slots, the first 4 symbols are used as AGC and the last 4 symbols are used as GP. The first-time unit using the slot structure illustrated in Figure 19A, for example, can be applied to the case where the side-link subcarrier spacing is 480 kHz.

[00179] Figure 19B illustrates another example of Petition 870250078539, dated 03 / 09 / 2025, page 55 / 580 48 / 241 a first-time unit. In Figure 19B, the first time unit includes 4 slots (i.e., slot n, slot (n+1), slot (n+2), and slot (n+3) in Figure 19A), i.e., M equals 4. In the 4 slots, the first 8 symbols are used as AGC and the last 8 symbols are used as GP. The first time unit using the slot structure illustrated in Figure 19B, for example, can be applied to the case where the side-link subcarrier spacing is 480 kHz or 960 kHz.

[00180] Figure 19C illustrates another example of a first-time unit. In Figure 19C, the first time unit includes 4 slots (i.e., slot n, slot (n+1), slot (n+2), and slot (n+3) in Figure 19C), i.e., M equals 4. In the 4 slots, the first 4 symbols are used as AGC and the last 4 symbols are used as GP. The first time unit includes the PSFCH transmission feature. The PSFCH transmission feature occupies 5 symbols, one of which is used to transmit side-link feedback information (e.g., HARQ information) or conflict indication information, and the remaining 4 symbols are used as AGC. In addition, 4 symbols used as GP are included before the symbol corresponding to the PSFCH transmission feature. The first time unit using the slot structure illustrated in Figure 19C, for example, can be applied to the case where the side-link subcarrier spacing is 480 kHz.

[00181] Figure 19D illustrates another example of a first-time unit. In Figure 19D, the first time unit includes 4 slots (i.e., slot n, slot (n+1), slot (n+2), and slot (n+3) in Figure 19D), meaning M equals Petition 870250078539, dated 03 / 09 / 2025, p. 56 / 580 49 / 241 4. In the 4 time slots, the first 8 symbols are used as AGC and the last 8 symbols are used as GP. The first time unit includes the PSFCH transmission feature. The PSFCH transmission feature occupies 9 symbols, one of which is used to transmit side-link feedback information (e.g., HARQ information) or conflict indication information, and the remaining 8 symbols are used as AGC. Additionally, 8 symbols used as GP are included before the symbol corresponding to the PSFCH transmission feature. The first time unit using the slot structure illustrated in Figure 19D, for example, can be applied to the case where the side-link subcarrier spacing is 480 kHz or 960 kHz.

[00182] Figure 19E illustrates yet another example of a unit for the first time. In Figure 19E, the first time unit includes 4 slots (i.e., slot n, slot (n+1), slot (n+2), and slot (n+3) in Figure 19E), i.e., M equals 4. In the 4 slots, the first 4 symbols are used as AGC and the last 4 symbols are used as GP. The first time unit includes the PSFCH transmission feature. The PSFCH transmission feature occupies 8 symbols, of which 4 symbols are used to transmit side link feedback information (e.g., HARQ information) or conflict indication information, and the remaining 4 symbols are used as AGC. In addition, 4 symbols used as GP are included before the symbol corresponding to the PSFCH transmission feature. The first time unit using the slot structure illustrated in Figure 19E, for example, can be applied to the case where the side-link subcarrier spacing is Petition 870250078539, dated 03 / 09 / 2025, page 57 / 580 50 / 241 of 480 kHz. Figure 19E can be understood as a time unit structure including multislot obtained by proportional expansion (4 times the expansion) of a single slot structure corresponding to a subcarrier spacing of 120 kHz.

[00183] Figure 19F illustrates another example of a first-time unit. In Figure 19F, the first time unit includes 8 slots (i.e., slot n to slot (n+7) in Figure 19F), i.e., M equals 8. In the 8 slots, the first 8 symbols are used as AGC and the last 8 symbols are used as GP. The first time unit includes the PSFCH transmission feature. The PSFCH transmission feature occupies 16 symbols, 8 of which are used to transmit side-link feedback information (e.g., HARQ information) and the remaining 8 symbols are used as AGC. In addition, 8 symbols used as GP are included before the symbol corresponding to the PSFCH transmission feature. The first time unit using the slot structure illustrated in Figure 19F, for example, can be applied to the case where the side-link subcarrier spacing is 480 kHz or 960 kHz.Figure 19F can be understood as a multi-slot unit-time structure obtained by proportional expansion (8-fold expansion) of a single-slot structure corresponding to a subcarrier spacing of 120 kHz. MODE 1.1: A GUARD SYMBOL IN A FIRST-TIME UNIT

[00184] The guard symbol may also be referred to as a symbol used as GP. In some Petition 870250078539, dated 03 / 09 / 2025, pages 58 / 580 In 51 / 241 implementations, the guard symbol can be used by a terminal device to perform a receive-transmit conversion or a transmit-receive conversion. In some implementations, no data can be mapped to the guard symbol.

[00185] In some implementations, a first time unit may include a first guard symbol, the first guard symbol includes consecutive B1 symbols, and the B1 symbols are the last B1 symbols in the first time unit, and B1 is a positive integer greater than 1.

[00186] In some implementations, the first time unit may include a first guard symbol, the first guard symbol includes consecutive B1 symbols, and the B1 symbols are the last B1 symbols available for side link transmission in the first time unit, and B1 is a positive integer greater than 1.

[00187] In some implementations, a first guard symbol is located in the last slot of the first time unit.

[00188] In some implementations, if the first time unit includes a first-time domain feature to transmit a PSFCH, the first time unit may include second guard symbols, the second guard symbols will include consecutive B2 symbols, and B2 is a positive integer greater than 1. The B2 symbols in the second guard symbol may precede the first time domain feature. The B2 symbols may be adjacent to the first time domain feature, i.e., the last symbol of the B2 symbols and the first symbol of the Petition 870250078539, dated 03 / 09 / 2025, pp. 59 / 580 52 / 241 first time domain resource are adjacent symbols in the first time unit.

[00189] In some implementations, the second guard symbols are located in the last slot and / or in a second-last slot of the first time unit.

[00190] In some implementations, the value of B1 and the value of B2 are the same. For example, B1 and B2 are both equal to B, and B is a positive integer greater than 1. In some other implementations, the value of B1 and the value of B2 are different. For example, B1 is greater than B2 or B2 is greater than B1.

[00191] The method for determining the value of B is described in detail below. It should be understood that the method for determining the value of B may be applicable to B1, and it may also be applicable to B2.

[00192] In some implementations, the value of B is equal to 4. Furthermore, in some implementations, if the value of B is equal to 4 and a side-link subcarrier spacing corresponding to the first time unit is 480 kHz. For example, in time unit examples illustrated in Figures 18A, 18C, 18D, 19A, 19C, and 19E, the value of B is 4.

[00193] In some implementations, a value of B is equal to 8. Furthermore, in some implementations, if the value of B is equal to 8 and a side-link subcarrier spacing corresponding to the first time unit is 480 kHz or 960 kHz. For example, in time unit examples illustrated in Figures 18B, 19B, 19D, and 19F, the value of B is 8.

[00194] In some implementations, the value of B is determined based on one or more of the following Petition 870250078539, dated 03 / 09 / 2025, page 60 / 580 53 / 241 information: predefined information in a protocol; resource pool configuration information; side-link BWP configuration information; or information indicating a terminal device. The terminal device can be a side-link data transmission device or a side-link data receiver device.

[00195] In some implementations, the value of B can be determined based on the first indication information. The first indication information can be used to indicate one or more of the following: the value of B; a position in the time domain of the first symbol available for side-link transmission in a slot or time unit (the time unit mentioned in various embodiments of the present disclosure may refer to a time unit containing M consecutive slots, or a time unit containing M consecutive slots available for side-link transmission, which will not be repeated below); a length or number of symbols available for side-link transmission in a time unit; and a number of slots included in a time unit.

[00196] For example, the initial indication information can be used to directly indicate the value of B. Alternatively, the value of B can be determined based on the value indicated by the initial indication information.

[00197] As another example, the first indication information may include information 1 and information 2. Information 1 indicates the position in the time domain of the first symbol available for transmission of Petition 870250078539, dated 03 / 09 / 2025, page 61 / 580 54 / 241 side link in a slot or time unit. Information 2 indicates a length or the number of symbols available for side link transmission in a time unit. The value of B can be determined based on information 1 and information 2. For example, information 1 indicates that the position in the time domain of the first symbol available for side link transmission in a time unit is symbol 0; information 2 indicates that the number of symbols available for side link transmission in a time unit is 24. According to information 1 and information 2, it can be assumed that the first time unit includes 2 slots. In the case of normal CP, the first time unit includes 28 symbols, and therefore the number of symbols used as GP is 4, meaning the value of B is 4.

[00198] As another example, the initial indication information may include information 3. Information 3 indicates the length or number of symbols available for side-link transmission in a time unit. The value of B can be determined based on information 3. For example, information 3 indicates that the number of symbols available for side-link transmission in a time unit is 24. The value indicated by information 3 is greater than the number of symbols included in one slot and less than the number of symbols included in two slots. Therefore, it can be assumed that the first time unit includes two slots and both slots are available for side-link transmission. In the case of normal CP, two slots include a total of 28 symbols, and therefore the number of GP symbols is 4, i.e., a value of B is 4 (in this example, it is assumed that the initial symbol corresponding to the transmission feature is...). Petition 870250078539, dated 03 / 09 / 2025, page 62 / 580 55 / 241 (lateral link in the first time unit is the first symbol of the first time unit).

[00199] As another example, the first indication information may include information 4 and information 5. Information 4 indicates the length or number of symbols available for side-link transmission in a time unit. Information 5 indicates the number of time slots included in a time unit. The value of B can be determined based on information 4 and information 5. For example, information 4 indicates that the number of symbols available for side-link transmission in a time unit is 24, and information 5 indicates that a time unit includes 2 slots. In the case of normal CP, two slots include a total of 28 symbols, and therefore the number of GP symbols is 4, i.e., the value of B is 4 (in this example, it is assumed that the initial symbol corresponding to the side-link transmission feature in the first time unit is the first symbol of the first time unit).

[00200] In some implementations, the initial indication information may be included in the resource set configuration information or in the side-link BWP configuration information. Alternatively, the initial indication information may be indicated by a terminal device. The terminal device may be a side-link data transmission device or a side-link data receiver device.

[00201] In some implementations, the value of B can be determined based on the first side-link subcarrier spacing and a second side-link subcarrier spacing. The first spacing of Petition 870250078539, dated 03 / 09 / 2025, page 63 / 580 56 / 241 side link subcarrier is different from the second side link subcarrier spacing.

[00202] In some implementations, the first side-link subcarrier spacing may be larger than the second side-link subcarrier spacing.

[00203] In some implementations, the first side-link subcarrier spacing is a side-link subcarrier spacing corresponding to the first time unit.

[00204] In some implementations, the first subcarrier spacing is determined based on predefined information in a protocol, feature set configuration information, or side-link BWP configuration information. Taking the first side-link subcarrier spacing being determined based on side-link BWP configuration information as an example, side-link BWP configuration information can be used to configure a BWP corresponding to the first time unit.

[00205] In some implementations, the second subcarrier spacing is determined based on predefined information in a protocol, feature set configuration information, or side-link BWP configuration information. The second subcarrier spacing may sometimes also be called the reference subcarrier spacing.

[00206] In some implementations, the first side link subcarrier spacing is 480 kHz or 960 kHz. Petition 870250078539, dated 03 / 09 / 2025, page 64 / 580 57 / 241

[00207] In some implementations, the second subcarrier spacing is 15 kHz, 30 kHz, 60 kHz, or 120 kHz.

[00208] For example, the first side-link subcarrier spacing is represented by μ5£1, the second side-link subcarrier spacing is represented by μ5π2 and B satisfies the following equation: B = 2^SL1. Assuming that μ5£1 = 5 and μ5π2 = 3, that is, the first side-link subcarrier spacing is a 480 kHz subcarrier spacing, and the second side-link subcarrier spacing is a 120 kHz subcarrier spacing. In this case, B equals 4. Assuming that μ521 = 6 and μ522 = 3, that is, the first side-link subcarrier spacing is the 960 kHz subcarrier spacing, and the second side-link subcarrier spacing is the 120 kHz subcarrier spacing. In this case, B equals 8.

[00209] In some implementations, the first time unit may include two adjacent slots, a third guard symbol is defined between the symbols used for side link transmission in the two adjacent slots.

[00210] In some implementations, the third guard symbol includes symbols C and C can be a positive integer greater than or equal to 1. For example, a value of C is 1 or 2. As another example, the value of C is less than or equal to the value of B.

[00211] In some implementations, the third guard symbol corresponds to the last C symbols in Petition 870250078539, dated 03 / 09 / 2025, p. 65 / 580 58 / 241 preceding the two slots. In other words, the last C symbols of the preceding slot of the two adjacent slots are used as guard symbols.

[00212] In some implementations, the third guard symbol corresponds to the first C symbols of the last slot of two slots. In other words, the first C symbols of the last slot of the two adjacent slots are used as guard symbols.

[00213] In some implementations, the value of C is determined based on one or more of the following: predefined information in a protocol; configuration information from the resource set; configuration information from the side-link BWP; or information indicating a terminal device. The terminal device may be a side-link data transmission device or it may be a side-link data receiver device.

[00214] In some implementations, if the first time unit is used to transmit a plurality of PSSCHs, and the plurality of PSSCHs corresponds to different transport blocks (TBs) (for a detailed description of transmitting a plurality of PSSCHs in one time unit, and a plurality of PSSCHs corresponding to different TBs, see modality 2.3 below), the third guard symbol can be placed between adjacent slots in the first time unit. Since a plurality of PSSCHs corresponds to different TBs, a plurality of PSSCHs can be transmitted to different receiving devices and therefore a plurality of PSSCHs can correspond to different transmission beams. In this case, the transmitting device needs Petition 870250078539, dated 03 / 09 / 2025, p. 66 / 580 59 / 241 to switch the transmission beam when transmitting PSSCH, and a duration corresponding to the third guard symbol can be used by the transmitting device to switch the transmission beam.

[00215] In some implementations, if the first time unit is used to transmit a plurality of PSSCHs, a fourth guard symbol is defined between the transmission resources of two adjacent PSSCHs in the plurality of PSSCHs.

[00216] In some implementations, the fourth guard symbol includes symbols D, and D is a positive integer greater than or equal to 1. For example, a value of D is 1 or 2. As another example, the value of D is less than or equal to the value of B.

[00217] In some implementations, the fourth guard symbol corresponds to the last D symbols in the last slot occupied by the preceding PSSCH of two adjacent PSSCHs transmitted in the first time unit. In other words, the last D symbols in the last slot occupied by the preceding PSSCH of the two adjacent PSSCHs are used as guard symbols. For details, see the example illustrated in Figure 31 below. In this example, two PSSCHs in a time unit are separated by a guard symbol (i.e., D equals 1).

[00218] In some implementations, the fourth guard symbol corresponds to the first D symbols in the first slot occupied by the later PSSCH of two adjacent PSSCHs transmitted in the first time unit. In other words, the first D symbols in the first slot occupied by the last PSSCH of the two PSSCHs Petition 870250078539, dated 03 / 09 / 2025, p. 67 / 580 60 / 241 adjacent numbers are used as guard symbols.

[00219] In some implementations, a value of D is determined based on one or more of the following: predefined information in a protocol; configuration information from the resource set; configuration information from the side-link BWP; or information indicating a terminal device. The terminal device may be a side-link data transmission device or it may be a side-link data receiver device.

[00220] In some implementations, if the first time unit is used to transmit a plurality of PSSCHs, and the plurality of PSSCHs correspond to different TBs (for a detailed description of transmitting a plurality of PSSCHs in one time unit, and a plurality of PSSCHs corresponding to different TBs, see modality 2.3 below), the fourth guard symbol can be defined between adjacent slots in the first time unit. Since a plurality of PSSCHs corresponds to different TBs, a plurality of PSSCHs can be transmitted to different receiving devices, and therefore a plurality of PSSCHs can correspond to different transmission beams. In this case, the transmitting device needs to switch the transmission beam when transmitting the PSSCH, and a duration corresponding to the fourth guard symbol can be used by the transmitting device to switch the transmission beam.

[00221] In some implementations, if the first time unit is used to transmit a PSSCH (for Petition 870250078539, dated 03 / 09 / 2025, p. 68 / 580 61 / 241 detailed description, mode 2.1 below can be consulted), a third guard symbol may not be set between adjacent slots in the first time unit.

[00222] In some implementations, if the first time unit is used to transmit a plurality of PSSCHs, and the plurality of PSSCHs corresponds to the same TB (for detailed description, see modality 2.2 below), the third guard symbol may not be set between adjacent slots in the first time unit; or the fourth guard symbol may not be set between adjacent PSSCHs of the plurality of PSSCHs.

[00223] In some implementations, at least one slot of the M slots included in the first time unit does not include a guard symbol. As one implementation, the remaining slots other than the last slot of the M slots included in the first time unit do not include a guard symbol.

[00224] For example, in Figure 18A and Figure 18B, the first time unit includes 2 slots, that is, one slot n and one slot (n+1). The slot (n+1) includes a guard symbol used as GP and the slot n does not include a guard symbol used as GP.

[00225] As another example, in Figure 19A and Figure 19B, the first time unit includes four slots, namely, slot n, slot (n+1), slot (n+2) and slot (n+3). Slot (n+3) includes a guard symbol used as GP, and slots n, (n+1) and (n+2) do not include a guard symbol used as GP.

[00226] In some implementations, if the first time unit includes a time-domain resource to transmit a PSFCH, the last slot and / or a second last Petition 870250078539, dated 03 / 09 / 2025, page 69 / 580 Slot 62 / 241 of the M slots will include a guard symbol. Additionally, in some implementations, the remaining slots other than the last slot and / or the second-to-last slot of the M slots do not include a guard symbol. MODALITY 1.2: TIME-FREQUENCY RESOURCES OF A PSCCH IN A FIRST UNIT OF TIME

[00227] In some implementations, a first time unit includes second time domain features to transmit a PSCCH, an initial symbol of the second time domain features is an (A+1)-th symbol in the first time unit and A is a positive integer greater than 1.

[00228] In some implementations, a value of A is equal to 4. Furthermore, in some implementations, if the value of A is equal to 4, a side-link subcarrier spacing corresponding to a first time unit is 480 kHz. For example, in the time unit examples illustrated in Figures 18A, 18C, 18D, 19A, 19C, and 19E, the value of A is 4.

[00229] In some implementations, a value of A is equal to 8. Furthermore, in some implementations, if the value of A is equal to 8, a side-link subcarrier spacing corresponding to a first time unit is 480 kHz or 960 kHz. For example, in the time unit examples illustrated in Figures 18B, 19B, 19D, and 19F, the value of A is 8.

[00230] In some implementations, a value of A is determined based on one or more of the following information: predefined information in a protocol; configuration information of the feature set; Petition 870250078539, dated 03 / 09 / 2025, p. 70 / 580 63 / 241 side-link BWP configuration information; or terminal device indication information. The terminal device may be a side-link data transmission device or a side-link data receiver device.

[00231] In some implementations, a value of A is determined based on the second piece of indication information.For example, the second indication information is used to indicate one or more of the following: the value of A; a position in the time domain of the first symbol available for transmitting a PSSCH in a time unit; a position in the time domain of the first symbol available for transmitting a PSCCH in a time unit; a position in the time domain of the first symbol used to map the PSSCH in a time unit; a position in the time domain of the first symbol used to map the PSCCH in a time unit; a position in the time domain of the first symbol of PSSCH resource allocation in a time unit; a position in the time domain of the first symbol of PSCCH resource allocation in a time unit; and a position in the time domain of the first symbol available for side link transmission in a slot or in a time unit.

[00232] As an example, the second piece of information directly indicates the value of A. Alternatively, the value of A is determined based on the value indicated by the second piece of information.

[00233] As another example, the second indication information indicates a position in the time domain of the first symbol available to transmit the PSSCH. Petition 870250078539, dated 03 / 09 / 2025, page 71 / 580 64 / 241 or the PSCCH in a time unit. The value of A can be determined based on the second indication information. For example, the second indication information indicates that the position of the first PSSCH symbol is the fifth symbol in the first time unit, the value of A is 4 (in this example, it is assumed that an initial symbol corresponding to the side link transmission feature in the first time unit is the first symbol of the first time unit).

[00234] As another example, the second indication information can indicate information 6 and information 7. Information 6 is used to indicate a position in the time domain of the first symbol available to transmit the PSSCH or PSCCH in a time unit. Information 7 is used to indicate the position in the time domain of the first symbol available for side-link transmission in a slot or in a time unit. The value of A can be determined based on information 6 and information 7. For example, information 6 indicates that the position in the time domain of the first symbol available to transmit the PSSCH is symbol 6, and information 7 indicates that the position in the time domain of the first symbol available for side-link transmission in a slot is symbol 2. According to information 6 and information 7, it can be determined that the value of A is 4.

[00235] In some implementations, the second indication information may be included in the resource set configuration information or in the side-link BWP configuration information. Alternatively, the second indication information may be indication information from a terminal device. The terminal device Petition 870250078539, dated 03 / 09 / 2025, page 72 / 580 65 / 241 can be a side-link data transmission device or it can be a side-link data receiver device.

[00236] In some implementations, a value of A is determined based on a third side-link subcarrier spacing and a fourth side-link subcarrier spacing. The third side-link subcarrier spacing is different from the fourth side-link subcarrier spacing.

[00237] In some implementations, the third side link subcarrier spacing may be larger than the fourth side link subcarrier spacing.

[00238] In some implementations, the third side link subcarrier spacing is a side link subcarrier spacing corresponding to the first time unit.

[00239] In some implementations, the third side-link subcarrier spacing is determined based on the side-link BWP configuration information, where the side-link BWP configuration information is used to configure a BWP corresponding to the first time unit.

[00240] In some implementations, the third subcarrier spacing is determined based on predefined information in a protocol, feature set configuration information, or side-link BWP configuration information.

[00241] In some implementations, the third side link subcarrier spacing is 480 kHz or Petition 870250078539, dated 03 / 09 / 2025, page 73 / 580 66 / 241 960 kHz.

[00242] In some implementations, the fourth side-link subcarrier spacing is 15 kHz, 30 kHz, 60 kHz, or 120 kHz.

[00243] In some implementations, the third side link subcarrier spacing is equal to the first side link subcarrier spacing; and / or, the fourth side link subcarrier spacing is equal to the second side link subcarrier spacing.

[00244] For example, the third side-link subcarrier spacing is represented by μ5Κ3, the fourth side-link subcarrier spacing is represented by μ5Σ4, and A satisfies the following equation: A = 2^SL3 _ „ . Assuming that μ3ι,3 = 5 and μ334 = 3, that is, the third side-link subcarrier spacing is a 480 kHz subcarrier spacing, and the fourth side-link subcarrier spacing is a 120 kHz subcarrier spacing. In this case, A equals 4. Assuming that μ333 = 6 and μ334 = 3, the third side-link subcarrier spacing is the 960 kHz subcarrier spacing, and the The fourth side-link subcarrier spacing is the 120 kHz subcarrier spacing. In this case, A equals 8.

[00245] In some implementations, the first A symbols of the first time unit (or the first A symbols available for side link transmission in the first time unit) are used as AGC.

[00246] In some implementations, the data Petition 870250078539, dated 03 / 09 / 2025, p. 74 / 580 67 / 241 transmitted in the first A symbols in the first time unit (or the first A symbols available for side-link transmission in the first time unit) are repeated data from data transmitted in a target symbol in the first time unit. The target symbol may include one or more symbols from the remaining symbols in the first time unit other than the first A symbols.

[00247] In some implementations, the target symbol is a (A+1)th symbol to a 2Ath symbol in the first time unit. That is, the data transmitted in the first A symbols in the first time unit are repeated data from data transmitted in the (A+1)th symbol to the 2Ath symbol in the first time unit. For example, data transmitted in the first symbol in the first time unit are repeated data from data transmitted in the (A+1)th symbol in the first time unit; data transmitted in the second symbol in the first time unit are repeated data from data transmitted in the (A+2)th symbol in the first time unit; and so on, data transmitted in an Ath symbol in the first time unit are repeated data from data transmitted in the 2Ath symbol in the first time unit.

[00248] In some implementations, the target symbol is the (A+1)th symbol of the first time unit. That is, the data transmitted in the first A symbols of the first time unit are repeated data transmitted in the (A+1)th symbol of the first time unit. It can be seen that in this implementation, the first A symbols and the (A+1)th symbol of the first time unit transmit the same data. Petition 870250078539, dated 03 / 09 / 2025, p. 75 / 580 68 / 241

[00249] In some implementations, the second-time domain feature includes P consecutive symbols. A value of P can be a positive integer greater than or equal to 1, for example, the value of P can be 3.

[00250] In some implementations, a value of P is determined based on one or more of the following: predefined information in a protocol; configuration information from the resource set; configuration information from the side-link BWP; or information indicating a terminal device. The terminal device may be a side-link data transmission device or it may be a side-link data receiver device.

[00251] In some implementations, in a case where a PSCCH is transmitted in a first time unit, the PSCCH may occupy Q PRBs in the frequency domain, and Q is a positive integer greater than or equal to 1.

[00252] In some implementations, a Q value is determined based on one or more of the following: predefined information in a protocol; configuration information from the feature set; configuration information from the side-link BWP; or information indicating a terminal device. The terminal device may be a side-link data transmission device or it may be a side-link data receiver device.

[00253] In some implementations, a PSCCH can be used to schedule a PSSCH, and a starting position in the frequency domain of the Q PRBs can be the same as a starting position in the frequency domain of the PSSCH. Petition 870250078539, dated 03 / 09 / 2025, p. 76 / 580 69 / 241

[00254] In some implementations, a PSCCH can be used to schedule a PSSCH, and the Q PRBs are located in the first subchannel corresponding to a transmission resource of the PSSCH. MODALITY 1.3: TIME-FREQUENCY RESOURCES OF A PSSCH IN A FIRST UNIT OF TIME

[00255] In some implementations, a first time unit includes third time-domain features to transmit a PSSCH, an initial symbol of the third time-domain features may be an (A+1)th symbol in the first time unit and A is a positive integer greater than 1.

[00256] In some implementations, the first time unit includes third time-domain resources for transmitting a PSSCH, an initial symbol of the third time-domain resources may be an (A+1)th symbol available for side-link transmission in the first time unit and A is a positive integer greater than 1.

[00257] For the method of determining a value of A, one may refer to the description of Mode 1.2, which will not be repeated here for the sake of brevity. Alternatively, in some modes, A in Mode 1.2 may be A1, and A in Mode 1.3 may be A2, and A1 and A2 may be the same or different.

[00258] In some implementations, if the first time unit does not include a PSFCH transmission feature, a final symbol of the third time domain features is a symbol that precedes a symbol corresponding to a first guard symbol. For the relevant description of Petition 870250078539, dated 03 / 09 / 2025, p. 77 / 580 70 / 241 symbol of the first guard, Modality 1.1 above can be consulted, the same will not be described in detail here. For example, in Figure 18A, the PSSCH time-domain feature includes the fifth symbol in slot n to the fifth to last symbol in slot (n+1). In Figure 18B, the PSSCH time-domain feature includes the ninth symbol in slot n to the sixth symbol in slot (n+1) (i.e., the ninth to last symbol). In Figure 19A, the PSSCH time-domain feature includes the fifth symbol in slot n to the fifth to last symbol in slot (n+3). In Figure 19B, the PSSCH time-domain feature includes the ninth symbol in slot n to the sixth symbol in slot (n+3) (i.e., the ninth to last symbol).

[00259] In some implementations, a final symbol of third-party time-domain resources is the last symbol available to transmit a PSSCH in a first time unit.

[00260] In some implementations, if the first time unit includes a PSFCH transmission feature, a final symbol of the third time domain feature is a symbol that precedes a symbol corresponding to a second guard symbol. For the relevant description of the second guard symbol, see Mode 1.1 above; it will not be described in detail here. For example, in Figure 18C, the PSSCH time domain feature includes the fifth symbol in slot n to the first symbol in slot (n+1). In Figure 19C, the PSSCH time domain feature includes the fifth symbol of slot n to the first symbol of slot (n+3); in FIG. 19D, the PSSCH time domain feature includes the ninth symbol of slot n Petition 870250078539, dated 03 / 09 / 2025, page 78 / 580 71 / 241 up to the third symbol of a slot (n+2). MODALITY 1.4: TIME-FREQUENCY RESOURCES OF A PSFCH IN A FIRST UNIT OF TIME

[00261] In some implementations, the first time unit includes fourth timedomain features to transmit a PSFCH, the fourth timedomain features may include K symbols and K is a positive integer greater than 1.

[00262] In some implementations, the K symbols are K symbols preceding the first guard symbol and adjacent to the first guard symbol (i.e., the last symbol of the K symbols is a symbol preceding the first guard symbol).

[00263] In some implementations, a value of K is determined based on one or more of the following: predefined information in a protocol; configuration information from the resource set; configuration information from the side-link BWP; or information indicating a terminal device. The terminal device may be a side-link data transmission device or it may be a side-link data receiver device.

[00264] In some implementations, the fourth time domain features are located in the first H slots of the first time unit or in the last H slots of the first time unit. H is a positive integer greater than or equal to 1, and a value of H can be 1 or 2, for example. For example, in a case where the value of A or B is 4, the value of H can be 1. For another example, in a case where the value of A or B is 8, the value of H can be 2. Petition 870250078539, dated 03 / 09 / 2025, p. 79 / 580 72 / 241

[00265] In some implementations, a value of H is determined based on one or more of the following: predefined information in a protocol; configuration information from the resource set; configuration information from the side-link BWP; or information indicating a terminal device. The terminal device may be a side-link data transmission device or it may be a side-link data receiver device.

[00266] In some implementations, the fourth time domain resources are located in the first slot of the first time unit.

[00267] In some implementations, the fourth time-domain features are located in the last slot of the first time unit (the implementation is used primarily as an example below for description, and the embodiments of the present disclosure are not limited to it).

[00268] In some implementations, the K symbols occupied by the fourth time-domain features include K1 symbols and K2 symbols. K1 and K2 are positive integers, and K is equal to the sum of K1 and K2. K2 symbols may be located before K1 symbols and adjacent to K2 symbols. K1 symbols may be used to transmit PSFCH (e.g., used to transmit side-link feedback information or conflict information). Data transmitted in K2 symbols may be repeated data from data transmitted in K1 symbols. K2 symbols may be used for AGC tuning or AGC training.

[00269] In some implementations, a value of K1 Petition 870250078539, dated 03 / 09 / 2025, page 80 / 580 73 / 241 is determined based on one or more of the following: predefined information in a protocol; configuration information from the resource set; configuration information from the side-link BWP; or information indicating a terminal device. The terminal device may be a side-link data transmission device or a side-link data receiver device.

[00270] In some implementations, a K1 value can be determined based on a fifth side-link subcarrier spacing and a sixth side-link subcarrier spacing. The fifth side-link subcarrier spacing is different from the sixth side-link subcarrier spacing.

[00271] In some implementations, the fifth side-link subcarrier spacing may be larger than the sixth side-link subcarrier spacing.

[00272] In some implementations, the fifth side-link subcarrier spacing is a side-link subcarrier spacing corresponding to the first time unit.

[00273] In some implementations, the fifth subcarrier spacing is determined based on predefined information in a protocol, feature set configuration information, or side-link BWP configuration information. Taking as an example the first side-link subcarrier spacing being determined based on side-link BWP configuration information, side-link BWP configuration information can be used to configure a BWP Petition 870250078539, dated 03 / 09 / 2025, page 81 / 580 74 / 241 corresponds to a first unit of time.

[00274] In some implementations, the sixth side-link subcarrier spacing is determined based on predefined information in a protocol, feature set configuration information, or side-link BWP configuration information. The sixth side-link subcarrier spacing may sometimes also be called the reference subcarrier spacing.

[00275] In some implementations, the fifth side-link subcarrier spacing is 480 kHz or 960 kHz.

[00276] In some implementations, the sixth side-link subcarrier spacing is 15 kHz, 30 kHz, 60 kHz, or 120 kHz.

[00277] In some implementations, a K2 value is determined based on one or more of the following: predefined information in a protocol; feature set configuration information; side-link BWP configuration information; or information indicating a terminal device. The terminal device may be a side-link data transmission device or a side-link data receiver device.

[00278] In some implementations, a K2 value can be determined based on a seventh side-link subcarrier spacing and an eighth side-link subcarrier spacing. The seventh side-link subcarrier spacing is different from the eighth side-link subcarrier spacing. Petition 870250078539, dated 03 / 09 / 2025, page 82 / 580 75 / 241

[00279] In some implementations, the seventh side-link subcarrier spacing may be larger than the eighth side-link subcarrier spacing.

[00280] In some implementations, the seventh side-link subcarrier spacing is a side-link subcarrier spacing corresponding to the first time unit.

[00281] In some implementations, the seventh subcarrier spacing is determined based on predefined information in a protocol, feature set configuration information, or side-link BWP configuration information. Taking the first side-link subcarrier spacing being determined based on side-link BWP configuration information as an example, side-link BWP configuration information can be used to configure a BWP corresponding to the first time unit.

[00282] In some implementations, the eighth side-link subcarrier spacing is determined based on predefined information in a protocol, feature set configuration information, or side-link BWP configuration information. The eighth side-link subcarrier spacing may sometimes also be called the reference subcarrier spacing.

[00283] In some implementations, the seventh side link subcarrier spacing is 480 kHz or 960 kHz.

[00284] In some implementations, the eighth side-link subcarrier spacing is 15 kHz, 30 Petition 870250078539, dated 03 / 09 / 2025, page 83 / 580 76 / 241 kHz, 60 kHz or 120 kHz.

[00285] In some implementations, K1 is less than or equal to K2. For example, K1 equals 1, K2 equals A. Alternatively, K1 equals A, K2 equals A. A can be a positive integer greater than 1. For example, a value of A can be determined based on a position in the time domain of the first symbol corresponding to the PSSCH transmission resources in the first time unit. For the method of determining a value of A, the description of Mode 1.2 can be referred to and will not be described in detail here.

[00286] In some implementations, if K1 is greater than 1, each of the K1 symbols is used to transmit a PSFCH.

[00287] In some implementations, if K1 is greater than 1, the K1 symbols are commonly used to transmit a PSFCH, i.e., the transmission feature of a PSFCH corresponds to the K1 symbols.

[00288] In some implementations, if K1 equals 1, the data transmitted in each symbol of the K2 symbols is repeated data from the data transmitted in the K1 symbols.

[00289] In some implementations, if K1 is greater than 1, the data transmitted in all symbols L (L equals K1) from the end to the beginning of symbols K2 are repeated data from the data transmitted in symbols K1. L equals K1. For example, K1 equals 2, and the data transmitted in every two symbols from the end to the beginning of symbols K2 are repeated data from the data transmitted in symbols K1. Petition 870250078539, dated 03 / 09 / 2025, p. 84 / 580 77 / 241

[00290] For example, referring to Figure 18D, the PSFCH time-domain feature includes symbols 4 to 9 in a (n+1) slot (the first symbol corresponds to a symbol 0), where symbols 4 to 7 are used as AGC, and symbols 8 and 9 are used to transmit side-link feedback information. In Figure 18D, K1 equals 2. In the case where the data transmitted in each two symbols from the end to the beginning of symbols K2 is repeated data of the data transmitted in symbols K1, the data transmitted in symbol 7 is repeated data of the data transmitted in symbol 9, the data transmitted in symbol 6 is repeated data of the data transmitted in symbol 8, the data transmitted in symbol 5 is repeated data of the data transmitted in symbol 9, and the data transmitted in symbol 4 is repeated data of the data transmitted in symbol 8.

[00291] In some implementations, if K1 is greater than 1, the data transmitted in all symbols L from the beginning to the end of symbols K2 are repeated data from the data transmitted in symbols K1. L is equal to K1. For example, K1 is equal to 2, and the data transmitted in every two symbols from the beginning to the end of symbols K2 are repeated data from the data transmitted in symbols K1.

[00292] For example, referring to Figure 18D, the time-domain features of a PSFCH include symbols 4 to 9 in a slot (n+1) (the first symbol corresponds to a symbol 0), where symbols 4 to 7 are used as AGC and symbols 8 and 9 are used to transmit side-link feedback information. In Figure 18D, K1 equals 2. If the data transmitted in each two symbols, from the end to the beginning of the Petition 870250078539, dated 03 / 09 / 2025, p. 85 / 580 78 / 241 K2 symbols, where data is repeated from the data transmitted in K1 symbols, the data transmitted in symbol 4 is repeated from the data transmitted in symbol 8, the data transmitted in symbol 5 is repeated from the data transmitted in symbol 9, the data transmitted in symbol 6 is repeated from the data transmitted in symbol 8, and the data transmitted in symbol 7 is repeated from the data transmitted in symbol 9.

[00293] In some implementations, in a case where the first time unit includes time-domain resources to transmit a PSFCH, the PSFCH may occupy X PRBs in the frequency domain and X is a positive integer greater than or equal to 1.

[00294] In some implementations, a value of X is determined based on one or more of the following: predefined information in a protocol; configuration information from the feature set; configuration information from the side-link BWP; or information indicating a terminal device. The terminal device may be a side-link data transmission device or it may be a side-link data receiver device.

[00295] In some implementations, in a case where X is greater than 1, the side-link feedback information transmitted by the PSFCH is carried in a first sequence, the length of which is equal to T. T can be equal to the number of subcarriers included in a PRB. For example, a value of T can be 12. In this implementation, the first sequence can be mapped to a PRB of the X PRBs, and the data transmitted by the PRBs Petition 870250078539, dated 03 / 09 / 2025, p. 86 / 580 The remaining 79 / 241 of the X PRBs, different from a PRB, are determined based on the first sequence. For example, the data transmitted by the remaining PRBs of the X PRBs different from a PRB is determined directly based on the first sequence, or it can be determined based on multiplying the first sequence by a rotation factor.

[00296] In some implementations, in a case where X is greater than 1, the side-link feedback information transmitted by the PSFCH is carried in a second sequence; the length of the second sequence can be determined based on a value of X multiplied by T. T can be equal to the number of subcarriers included in a PRB. For example, the value of T can be 12. The second sequence can be mapped to all or part of the subcarriers corresponding to the X PRBs. For example, the length of the second sequence is X multiplied by T, and the second sequence can be mapped to all the subcarriers corresponding to X PRBs, respectively.As another example, the length of the second sequence is a maximum prime number less than X multiplied by T, and the second sequence can be mapped to some subcarriers corresponding to X PRBs, and the data transmitted on the remaining subcarriers is 0, or the data transmitted on the remaining subcarriers is a repetition of a partial sequence in the second sequence. MODE 1.5: INFORMATION / PARAMETERS DETERMINED BASED ON A NUMBER OR INDEX OF TIME UNITS

[00297] In some implementations, the first time unit includes a transmission resource for the first SCI stage, for example, the first SCI stage is Petition 870250078539, dated 03 / 09 / 2025, page 87 / 580 80 / 241 transported by a PSCCH. First-stage SCIs may include an information field to indicate resource allocation in the time domain; a value of the information field to indicate resource allocation in the time domain (e.g., a time-domain resource indication value (TRIV)) may be determined based on the time offsets of the remaining transmission resources (W-1) of the transmission resources W that are not the first transmission resource relative to the first transmission resource, and the time offset may be represented based on multiple time units. W is a positive integer greater than 1. The value of W may be determined based on multiple transmission resources indicated by the first-stage SCIs.

[00298] Taking Figure 20 as an example, a time unit includes 2 slots. The first time unit can be the time unit with an index of 1 in Figure 20, i.e., a time unit 1. The first SCIs transmitted in time unit 1 include an information field to indicate the allocation of resources in the time domain, and the value of the information field is determined based on a time interval t1 between a second transmission resource R2 and a first transmission resource R1 of three transmission resources (i.e., the first transmission resource R1, the second transmission resource R2, and the third transmission resource R3 in Figure 20) and a time interval t2 between the third transmission resource R3 and the first transmission resource. As can be seen in Figure 20, t1 includes 2 time units and t2 includes 5 time units. Petition 870250078539, dated 03 / 09 / 2025, page 88 / 580 81 / 241

[00299] In some implementations, the side-link transmission resource corresponding to side-link transmission or side-link reception is determined based on the first DCI (e.g., the terminal device is in a first mode), and the first DCI may include third-party indication information. The third-party indication information may be used to indicate one of the following: a time interval between the reception of the first DCI and a side-link transmission resource; a time interval between a slot in which the first DCI is located and a first time unit in which the side-link transmission resource is located; and a time interval between the start time of the downlink slot carrying the first DCI and the start time of a side-link transmission resource. The time interval may be represented based on multiple time units.

[00300] In some implementations, the side-link transmission resource corresponding to side-link transmission or side-link reception is a side-link configured grant (CG) transmission resource, and the side-link configured grant transmission resource is determined solely based on the RRC signaling transmitted by the network device (e.g., side-link configuration grant is a first type of side-link configuration grant). The RRC signaling may include sixth indication information. Sixth indication information may be used to indicate a time interval between the side-link transmission resource and a reference position in the domain of Petition 870250078539, dated 03 / 09 / 2025, page 89 / 580 82 / 241 SFN time. The time interval can be represented based on various time units. The position in the time domain of the reference SFN can be determined based on a configuration parameter sl-TimeReferenceSFN-Type1.

[00301] In some implementations, the first terminal device may determine a first reservation period based on one or more of the following: a second reservation period indicated by indication information in SCI (for example, SCIs indicate the second reservation period through a resource reservation period information field); and a number of time units in a resource set. The first reservation period can be represented based on multiple time units, and the second reservation period can be represented based on milliseconds.

[00302] For example, the first reservation period satisfies the following equation: P' = 1rsvp T'1maxn 10240 msXPrsvp

[00303] Here, Prsvp represents the second reservation period and T'max represents the number of time units included in a set of resources during 10240 milliseconds (ms).

[00304] In some implementations, a period of PSFCH can be represented based on a number of time units. For example, the PSFCH period can be indicated based on the fourth indication information in the feature set configuration information, where the PSFCH period indicated by the fourth indication information is represented in the number of time units.

[00305] In a case where the spacing of Petition 870250078539, dated 03 / 09 / 2025, page 90 / 580 If the 83 / 241 side link subcarrier spacing is greater than 120 kHz (for example, in a case where the side link subcarrier spacing is 480 kHz or 960 kHz), to allow sufficient time for AGC adjustment, receive-transmit conversion, or transmit-receive conversion, a plurality of symbols used as AGC or GP is required. In this case, the number of symbols available for PSCCH / PSSCH transmission in a slot becomes very small, resulting in greater system overhead and reduced spectrum efficiency. According to the embodiment of the present disclosure, a time-unit structure is introduced that aggregates a plurality of slots.If side link transmission or reception is performed based on the time unit structure, even if a plurality of symbols used as AGC or GP is introduced, a time unit will have enough symbols available for PSCCH / PSSCH transmission, thus reducing system overhead and improving spectrum efficiency. MODE 2: A PSSCH TRANSMISSION METHOD BASED ON A FIRST UNIT OF TIME

[00306] It should be understood that a form of PSSCH transmission described in Mode 2 may be based on the time unit structure provided in Mode 1. In the absence of conflict, the content of Mode 2 may be arbitrarily combined with the implementation in Mode 1. For example, the first A symbols of the first time unit in Mode 2 may be used as AGC. As another example, the last B symbols of the first time unit in Mode 2 are guard symbols and may be used as GP. As another example, the symbols in the part Petition 870250078539, dated 03 / 09 / 2025, page 91 / 580 84 / 241 Mode 2 central systems may include transmission capabilities to transmit one or more PSCCH, PSSCH, or PSFCH systems.

[00307] In some implementations, the first time unit can be used to transmit a PSSCH.

[00308] In some implementations, the first time unit can be used to transmit R PSSCHs (R is a positive integer greater than 1). In a case where R PSSCHs are transmitted in the first time unit, the R PSSCHs may correspond to the same TB or different TBs.

[00309] In some implementations, the value of R is determined based on one or more of the following: predefined information in a protocol; preconfigured information; network device configuration information; resource set configuration information; side-link BWP configuration information; or terminal device indication information. The terminal device may be a side-link data transmission device or a side-link data receiver device.

[00310] In some implementations, the PSSCHs R transmitted in the first time unit include a first PSSCH, and the time-domain resource of the first PSSCH includes S slots, and S is a positive integer greater than or equal to 1. That is, the transmission resource of the first PSSCH includes the resource in the S slots available for PSSCH transmission.

[00311] In some implementations, a value of S is determined based on one or more of the following: predefined information in a protocol; preconfigured information; configuration information of a device. Petition 870250078539, dated 03 / 09 / 2025, page 92 / 580 85 / 241 network; resource set configuration information; side-link BWP configuration information; or terminal device indication information. The terminal device may be a side-link data transmission device or a side-link data receiver device.

[00312] In some implementations, S is determined based on the quotient of M and R.

[00313] In some implementations, a terminal device does not expect M to be divisible by R, that is, M must be an integer multiple of R.

[00314] For example, S=M / RT. A value of T can be 0, 1 or 2.

[00315] In some implementations, the first PSSCH is any PSCCH in the PSSCHs R and the value of T is 0.

[00316] Furthermore, in some implementations, if the first PSSCH corresponds to the first R-1 PSSCHs of R PSSCHs, the value of T is a first value; and / or, if the first PSSCH corresponds to the last PSSCH of R PSSCHs, the value of T is a second value. As an example, the first value is 0 and the second value is 1 or 2.

[00317] Taking the first time unit as time unit #2 in Figure 26 as an example, time unit #2 occupies 4 slots and transmits 2 PSSCHs (i.e., PSSCH 1 and PSSCH 2 in time unit #2) and therefore M equals 4, R equals 2. As can be seen in Figure 26, PSSCH 1 transmitted in time unit #2 occupies 2 slots (i.e., S=M / R), and PSSCH 2 transmitted in time unit #2 occupies 1 slot (i.e., S=M / R-1).

[00318] In some implementations, R PSSCHs Petition 870250078539, dated 03 / 09 / 2025, p. 93 / 580 86 / 241 transmitted in a first time unit include a first PSSCH, and a slot occupied by the first PSSCH includes a first slot. For example, the method described above can be used to determine the S slots occupied by the first PSSCH based on M and R, and the first slot can be any slot of the S slots or the last slot of the S slots. The method of using the first slot can be determined based on the relationship between the first slot and a first limit value.

[00319] For example, if the number of symbols available for PSSCH transmission in the first time slot is less than a first limit value (a first limit value can be, for example, 2, 3 or 4), the first time slot is not used to transmit PSSCH and / or second-stage SCI.

[00320] For example, if the number of symbols available to transmit the PSSCH in the first slot is less than a first limit value (a first limit value can be, for example, 2, 3, or 4), the PSSCH data in the first slot is determined based on redundant bits, padding bits, or random bits. Alternatively, the receiving device does not expect to receive data transmitted in the PSSCH transmission feature in the first slot.

[00321] For example, if the number of symbols available to transmit the PSSCH in the first slot is less than a first limit value (a first limit value can be, for example, 2, 3, or 4), the PSSCH data in the first slot is repeated data from the data in the slot preceding the first slot (for example, the previous slot). Taking Figure 28 mentioned later as an example, Petition 870250078539, dated 03 / 09 / 2025, p. 94 / 580 87 / 241 if the first time unit is a time unit #2 in Figure 28, it can be seen in Figure 28 that the number of symbols available to transmit the PSSCH in the last slot (i.e., a slot (n+7)) of time unit #2 is 1 (i.e., the first symbol of the last slot). Assuming the first limit value is 3, the data transmitted in the first symbol in the last slot of time unit #2 can be repeated data from a PSSCH 1 transmitted in the first slot (i.e., a slot (n+4)) of time unit #2 or a PSSCH 3 transmitted in the previous slot (i.e., a slot (n+6)) of the last slot. As a more specific example, the data transmitted in the first symbol in the last slot of time unit #2 is repeated data from the data transmitted in the first symbol or the last symbol in slot (n+6).

[00322] In some implementations, the first limit is determined based on one or more of: predefined information in a protocol; preconfigured information; network device configuration information; resource set configuration information; side-link BWP configuration information; or terminal device indication information. The terminal device may be a side-link data transmission device or a side-link data receiver device.

[00323] In some implementations, if the R PSSCHs transmitted in a first time unit correspond to different TBs, the first slot uses the implementation method based on the first threshold value described above.

[00324] In some implementations, if the R PSSCHs Petition 870250078539, dated 03 / 09 / 2025, page 95 / 580 88 / 241 transmitted in a unit for the first time correspond to the same TB, the first slot is used to transmit the PSSCH and / or the second-stage SCI.

[00325] In some implementations, the first limit is determined based on the number of symbols included in a PSCCH transmission resource. Additionally, in some implementations, a first limit value is equal to the number of symbols included in the PSCCH transmission resource. For example, if the PSCCH transmission resource includes 2 symbols, the first limit value will be equal to 2. As another example, if the PSCCH transmission resource includes 3 symbols, the first limit value will be equal to 3.

[00326] In some implementations, the transmission of one PSSCH or R PSSCHs in a first time unit is determined based on configuration information. Configuration information may include one or more of the following: information predefined in a protocol; configuration information of the feature set; configuration information of the side-link BWP; or information indicating a terminal device. The terminal device may be a side-link data transmission device or it may be a side-link data receiver device.

[00327] In some implementations, in a case where R PSSCHs are transmitted in a first time unit, whether the R PSSCHs correspond to the same TB or to different TBs is determined based on configuration information. Configuration information may include one or more of the following: information predefined in a protocol; configuration information of Petition 870250078539, dated 03 / 09 / 2025, page 96 / 580 89 / 241 resource set; side-link BWP configuration information; or terminal device indication information. The terminal device may be a side-link data transmission device or a side-link data receiver device.

[00328] A more detailed explanation of the PSSCH transmission method based on the first time unit will be elaborated below in conjunction with Mode 2.1 to Mode 2.3. MODE 2.1: A FIRST TIME UNIT IS USED TO TRANSMIT A PSSCH

[00329] In this mode, only one PSSCH can be transmitted in the first time unit. For example, a PSSCH can be mapped to all resources in the time domain available for PSSCH transmission in the first time unit. The PSSCH can transmit a TB, and the TB can be transmitted through a plurality of slots (which can be called a multi-slot transmission block).

[00330] For example, an initial PSSCH mapping position may be located at the (A+1)th symbol of the first time unit. If the first time unit does not include PSFCH transmission features, a final PSSCH mapping position may be a symbol preceding a symbol corresponding to a first guard symbol; if the first time unit includes PSFCH transmission features, a final PSSCH symbol is a symbol preceding a symbol corresponding to a second guard symbol. For the relevant description of the first guard symbol and the second guard symbol, embodiment 1.1 may be consulted, which will not be described in detail here. Petition 870250078539, dated 03 / 09 / 2025, p. 97 / 580 90 / 241

[00331] In some implementations, a third guard symbol and a fourth guard symbol are not included in the first time unit. For the relevant description of the third guard symbol and the fourth guard symbol, see embodiment 1.1, which will not be described in detail here.

[00332] In some implementations, the first time unit is also used to transmit a second-stage PSCCH and / or SCI. For example, the first time unit may transmit only a second-stage PSCCH and SCI.

[00333] In some implementations, an initial mapping position of the second-stage SCIs is determined based on one or more of the following: predefined information in a protocol; configuration information from the resource set; configuration information from the side-link BWP; or information indicating a terminal device. The terminal device may be a side-link data transmission device or it may be a side-link data receiver device.

[00334] In some implementations, the second-stage SCI is mapped from the first PSSCH DMRS symbol of the first time unit.

[00335] In some implementations, if the first PSSCH DMRS symbol of the first time unit includes a subcarrier available to map the second-stage SCIs, the second-stage SCIs are mapped from the first PSSCH DMRS symbol; and / or, if the first PSSCH DMRS symbol of the first time unit does not include a subcarrier available to map the second-stage SCIs Petition 870250078539, dated 03 / 09 / 2025, page 98 / 580 In stage 91 / 241, the second-stage SCIs are mapped from the next symbol of the first PSSCH DMRS symbol.

[00336] In some implementations, the second-stage SCI is mapped from the first symbol corresponding to a PSSCH transmission resource in the first time unit.

[00337] In some implementations, the second-stage SCI is mapped from the first symbol used to map a PSSCH in the first time unit.

[00338] In some implementations, the second-stage SCI is mapped from the first PSSCH resource assignment symbol in the first time unit.

[00339] In some implementations, the second-stage SCI is mapped from the first symbol corresponding to a PSCCH transmission resource in the first time unit.

[00340] In some implementations, the second-stage SCI is mapped from the first symbol used to map a PSCCH in the first time unit.

[00341] In some implementations, the second-stage SCI is mapped from the first PSCCH resource assignment symbol in the first time unit.

[00342] For example, the first time unit could be a time unit #1 or a time unit #2 in Figure 21. In the example illustrated in Figure 21, a time unit includes 2 slots, i.e., M equals 2. Time unit #1 does not include PSSCH transmission resources, and time unit #2 includes a PSSCH transmission resource. The allocation of PSSCH resources in a time unit begins from the fifth symbol, i.e., A equals 4. The Petition 870250078539, dated 03 / 09 / 2025, page 99 / 580 The first 4 symbols of a time unit can be used as AGC, and the last 4 symbols of a time unit are used as GP, i.e., B equals 4. The time domain feature of the PSFCH in time unit #2 includes 5 symbols. The first 4 symbols of the five symbols can be used as AGC, and the fifth symbol can be used to transmit the PSFCH. Therefore, the data transmitted in the first 4 symbols of the five symbols can be the same as the data transmitted in the fifth symbol. In the example illustrated in Figure 21, a time unit transmits a PSCCH and a PSSCH, the PSSCH is used to transmit a TB, and the PSSCH is mapped to two slots included in the corresponding time unit.

[00343] As another example, the first time unit can be a time unit #1 or a time unit #2 in Figure 22. In the example illustrated in Figure 22, a time unit includes 4 slots, i.e., M equals 4. Time unit #1 does not include PSFCH transmission resources, and time unit #2 includes a PSFCH transmission resource. The allocation of PSFCH resources in a time unit starts from the ninth symbol, i.e., A equals 8. The first 8 symbols in a time unit can be used as AGC, and the last 8 symbols in a time unit are used as GP, i.e., B equals 8. The PSFCH time domain resource in time unit #2 includes 9 symbols. The first 8 symbols of the 9 symbols can be used as AGC, and the ninth symbol can be used to transmit PSFCH. Therefore, the data transmitted in the first 8 symbols out of the 9 symbols can be the same as the data transmitted in the ninth symbol. In the illustrated example Petition 870250078539, dated 03 / 09 / 2025, page 100 / 580 93 / 241 in Figure 22, a time unit transmits a PSCCH and a PSSCH, the PSSCH is used to transmit a TB and the PSSCH is mapped to four slots included in the corresponding time unit.

[00344] As can be seen in the above description of Mode 2.1, Mode 2.1 assigns more time-domain resources (i.e., time-domain resources occupying a plurality of slots) to a TB, so that transmission can be performed with fewer frequency-domain resources. Compared to a method where a TB is transmitted through one slot and more frequency-domain resources are assigned to the TB, in Mode 2.1, the transmission power of each PRB can be increased, thus achieving the goal of improving transmission performance. MODE 2.2: A first time unit is used to transmit R PSSCHS, and the R PSSCHS correspond to the same TB.

[00345] In some implementations, each of the R PSSCHs may occupy S slots (for example, see the description above for the way of determining the S slots). The way in which each PSSCH is mapped to the S slots may be similar to that of Mode 2.1, i.e., starting from the first symbol available to transmit the PSSCH from the S slots, the PSSCH is mapped sequentially to the last symbol available to transmit the PSSCH from the S slots.

[00346] In some implementations, the R PSSCHs correspond to the redundancy versions of R (RVs), respectively.

[00347] In some implementations, the values ​​of Petition 870250078539, dated 03 / 09 / 2025, p. 101 / 580 94 / 241 redundancy versions of R can be exactly the same.

[00348] In some implementations, the redundancy version values ​​of R may differ from one another.

[00349] In some implementations, the values ​​of the redundancy versions of R may be at least partially different.

[00350] In some implementations, the redundancy versions R are determined based on the fifth indication information (or redundancy version indication information) carried in the SCIs (which may be first-stage SCIs or second-stage SCIs).

[00351] For example, the fifth indication information can be used to indicate the first redundancy version of the R redundancy versions. The first redundant version can be, for example, a redundant version corresponding to the first PSSCH (a PSSCH with the oldest position in the time domain) of the R PSSCHs. The remaining redundancy versions of the R redundancy versions other than the first redundancy version can be determined according to the first redundancy version. For example, the remaining redundancy versions can be determined according to a predefined redundancy version sequence in a protocol. For example, the protocol predefines a cyclic order of redundancy versions as [0, 2, 3, 1]. Two PSSCHs are transmitted in the first time unit. The SCIs transmitted in the first time unit indicate that the redundancy version is 0 by means of the fifth indication information.Next, the redundancy version of the first PSSCH is 0 and the version of... Petition 870250078539, dated 03 / 09 / 2025, page 102 / 580 95 / 241 redundancy of the second PSSCH is 2. Alternatively, if the SCIs transmitted in the first time unit indicate that the redundancy version is 2 through the fifth indication information, the redundancy version of the first PSSCH is 2 and the redundancy version of the second PSSCH is 3. Alternatively, if the SCIs transmitted in the first time unit indicate that the redundancy version is 1 through the fifth indication information, the redundancy version of the first PSSCH is 1 and the redundancy version of the second PSSCH is 0.

[00352] For another example, the fifth indication information can be used to indicate each redundancy version of the R redundancy versions. For example, the information field in which the fifth indication information is located includes R sub-information fields, and the R sub-information fields are used, respectively, to indicate the redundant versions of R. As an example, two PSSCHs are transmitted in the first time unit, and the SCIs transmitted in the first time unit indicate redundancy version 0 and redundancy version 2, respectively, through the fifth indication information. Then, the redundancy version of the first PSSCH is 0 and the redundancy version of the second PSSCH is 2.Alternatively, the SCIs transmitted in the first time unit indicate that the redundancy version 0 and the redundancy version 3, respectively, through the fifth indication information, the redundancy version of the first PSSCH is 0 and the redundancy version of the second PSSCH is 3. Alternatively, the SCIs transmitted in the first time unit indicate that the redundancy version 3 and the redundancy version 1, respectively, through the... Petition 870250078539, dated 03 / 09 / 2025, page 103 / 580 96 / 241 fifths indication information, the redundancy version of the first PSSCH is 3 and the redundancy version of the second PSSCH is 1.

[00353] In some implementations, the R PSSCHs correspond to the same HARQ process number.

[00354] In some implementations, the initial time unit is also used to transmit a second-stage PSCCH and SCI. Of course, in other implementations, the initial time unit may also transmit a second-stage PSCCH and R second-stage SCIs; or, the initial time unit may also transmit R second-stage PSCCHs and R second-stage SCIs.

[00355] In some implementations, if the first time unit is used to transmit second-stage SCIs, an initial mapping position of the second-stage SCIs can be determined based on one or more of the following: predefined information in a protocol; configuration information from the resource set; configuration information from the side-link BWP; or indication information from a terminal device. The terminal device can be a side-link data transmission device or it can be a side-link data receiver device.

[00356] In some implementations, the second-stage SCI is mapped from the first PSSCH DMRS symbol of the first time unit.

[00357] In some implementations, if the first PSSCH DMRS symbol of the first time unit includes a subcarrier available to map the second-stage SCIs, the second-stage SCIs are mapped from the first PSSCH DMRS symbol; and / or, if the first symbol Petition 870250078539, dated 03 / 09 / 2025, page 104 / 580 97 / 241 Since the first time unit of the PSSCH DMRS does not include a subcarrier available to map the second-stage SCIs, the second-stage SCIs are mapped from the next symbol after the first PSSCH DMRS symbol.

[00358] In some implementations, second-stage SCIs are mapped from the first symbol corresponding to a PSSCH transmission resource in the first time unit.

[00359] In some implementations, the second-stage SCIs are mapped from the first symbol used to map a PSSCH in the first time unit.

[00360] In some implementations, second-stage SCIs are mapped from the first PSSCH resource allocation symbol in the first time unit.

[00361] In some implementations, the second-stage SCIs are mapped from the first symbol corresponding to a PSCCH transmission resource in a first time unit.

[00362] In some implementations, second-stage SCIs are mapped from the first symbol used to map a PSCCH in a first time unit.

[00363] In some implementations, second-stage SCIs are mapped from the first PSCCH resource allocation symbol in a first time unit.

[00364] For example, the first time unit can be a time unit #1 or a time unit #2 illustrated in Figure 23. As can be seen in Figure 23, a time unit includes 2 slots, i.e., M equals 2. The allocation of PSSCH resources in a time unit Petition 870250078539, dated 03 / 09 / 2025, page 105 / 580 98 / 241 starts from the fifth symbol, i.e., A equals 4. The first 4 symbols of a time unit can be used as AGC, and the last 4 symbols of a time unit are used as GP, i.e., B equals 4. Two PSSCHs are transmitted in a time unit, i.e., each slot is used to transmit one PSSCH. The resources in the PSCCH time domain include 3 symbols starting from the fifth symbol in a time unit. In time unit #2, there is only one symbol available to transmit the PSSCH in the second slot, but since PSSCH 2 transmitted in the second slot and PSSCH 1 transmitted in the first slot are used to transmit different redundant versions of the same TB, PSSCH 2 can still be transmitted in the second slot.

[00365] As another example, the first time unit can be a time unit #1 or a time unit #2, as illustrated in Figure 24. As can be seen in Figure 24, a time unit includes 4 slots, i.e., M equals 4. The allocation of PSSCH resources in a time unit starts from the fifth symbol, i.e., A equals 4. The first 4 symbols of a time unit can be used as AGC, and the last 4 symbols of a time unit are used as GP, i.e., B equals 4. Four PSSCHs are transmitted in a time unit, meaning each slot is used to transmit one PSSCH. The resources in the PSSCH time domain include 3 symbols starting from the fifth symbol in a time unit. Time unit #2 includes PSSCH transmission resources, so there is only one symbol available to transmit the PSSCH in the fourth slot of time unit #2. However, once the PSSCH is transmitted in the fourth slot and the PSSCH is transmitted in the other slots, the 4th slot is transmitted in the fourth slot. Petition 870250078539, dated 03 / 09 / 2025, p. 106 / 580 99 / 241 tracks in time unit #2 belong to different redundant versions of the same TB, PSSCH 4 can still be transmitted on the fourth track.

[00366] As another example, the first time unit can be a time unit #1 or a time unit #2, as illustrated in Figure 25. As can be seen in Figure 25, a time unit includes 4 slots, i.e., M equals 4. The allocation of PSSCH resources in a time unit starts from the fifth symbol, i.e., A equals 4. The first 4 symbols of a time unit can be used as AGC, and the last 4 symbols of a time unit are used as GP, i.e., B equals 4. Two PSSCHs are transmitted in a time unit, i.e., every two slots are used to transmit one PSSCH. The resources in the PSCCH time domain include 3 symbols starting from the fifth symbol in the first time unit. In a time unit, the first two slots transmit PSSCH 1 and the last two slots transmit PSSCH 2.Time unit #2 includes PSFCH transmission capabilities, so in the third and fourth slots of time unit #2, the number of symbols available for transmitting PSSCH 2 is less than the number of symbols available for transmitting PSSCH 1 in the first two slots of time unit #2.

[00367] As another example, the first time unit can be a time unit #1 or a time unit #2, as illustrated in Figure 26. As can be seen in Figure 26, a time unit includes 4 slots, i.e., M equals 4. The allocation of PSSCH resources in a time unit starts from the ninth symbol, i.e., A equals 8. The first 8 symbols in a time unit Petition 870250078539, dated 03 / 09 / 2025, p. 107 / 580 100 / 241 can be used as AGC, and the last 8 symbols in a time unit are used as GP, i.e., B equals 8. Two PSSCHs are transmitted in a time unit, i.e., every two slots are used to transmit one PSSCH. The time domain resources of the PSCCH include 3 symbols starting from the ninth symbol in a time unit. Time unit #2 includes PSFCH transmission resources, so there are only 3 symbols available for PSSCH transmission in the third and fourth slots of time unit #2. However, since PSSCH 2 transmitted in the third and fourth slots of time unit #2 and PSSCH 1 transmitted in the first 2 slots of time unit #2 transmit different redundant versions of the same TB, PSSCH 2 can still be transmitted in the first 2 slots of time unit #2.

[00368] In Mode 2.2, the first time unit is used to perform multiple transmissions in the TB, which can improve the reliability of the TB transmission and reduce latency. MODE 2.3: A first time unit is used to transmit R PSSCHS, and the R PSSCHS correspond to different TBS.

[00369] In some implementations, each of the R PSSCHs can occupy S slots (for the way to determine the S slots, see the description above). The way in which each PSSCH is mapped to S slots can be similar to that of Mode 2.1, i.e., starting from the first symbol available to transmit the PSSCH from the S slots, the PSSCH is mapped sequentially to the last symbol available to transmit the PSSCH from the S slots.

[00370] In some implementations, R PSSCHs Petition 870250078539, dated 03 / 09 / 2025, p. 108 / 580 101 / 241 are used to transmit different TBs.

[00371] In some implementations, the R PSSCHs correspond to the same receiving device.

[00372] In some implementations, the R PSSCHs do not correspond to the same receiving device. For example, R PSSCHs correspond to R different receiving devices.

[00373] In some implementations, the R PSSCHs correspond to the same spatial domain transmission filter.

[00374] In some implementations, the R PSSCHs do not correspond to the same spatial domain broadcast filter. For example, R PSSCHs correspond to R spatial domain broadcast filters.

[00375] Since different PSSCHs are used to transport different TBs, the parameters (e.g., priority information, modulation and coding scheme (MCS) information, new data indicator (NDI), HARQ process number, redundant version) corresponding to each TB may be different. Therefore, to indicate the parameters corresponding to the different TBs, the PSCCH in the first time unit and in the second-stage SCIs can be implemented in several different ways. For example, the first time unit may include one PSCCH or may include R PSCCHs; and / or, the first time unit may include second-stage SCIs or may include R second-stage SCIs.

[00376] Based on modality 2.3.1 to 2.3.3, three possible implementations of PSCCH and second-stage SCI transmitted in the first time unit are provided. MODALITY 2.3.1: A FIRST UNIT OF TIME IS Petition 870250078539, dated 03 / 09 / 2025, p. 109 / 580 102 / 241 USED ​​TO TRANSMIT R PSCCHs ER SCIs OF SECOND STAGE

[00377] In this mode, the R PSCCHs transmitted in the first time unit correspond one-to-one with the R PSSCHs, and the R SCIs of the second stage transmitted in the first time unit correspond one-to-one with the R PSSCHs. That is, each of the R PSSCHs corresponds to a respective PSCCH and second-stage SCI. The respective PSCCH corresponding to each PSSCH carries the first-stage SCIs, and the first-stage SCIs and the second-stage SCIs corresponding to each PSSCH, respectively, carry the information necessary for the demodulation of each PSSCH.

[00378] In some implementations, the initial position of the second-stage SCI mapping is determined based on one or more of the following: predefined information in a protocol; resource set configuration information; side-link BWP configuration information; or information indicating a terminal device. The terminal device may be a side-link data transmission device or a side-link data receiver device.

[00379] In some implementations, respective second-stage SCIs corresponding to each of the R PSSCHs transmitted in a first time unit are mapped from the first PSSCH DMRS symbol corresponding to each PSSCH.

[00380] In some implementations, the respective second-stage SCIs corresponding to each of the R PSSCHs transmitted in the first time unit are mapped from the first symbol corresponding to each PSSCH. Petition 870250078539, dated 03 / 09 / 2025, p. 110 / 580 103 / 241

[00381] In some implementations, the respective second-stage SCIs corresponding to each of the R PSSCHs transmitted in the first time unit are mapped from the first symbol of a target PSCCH. The target PSCCH refers to the respective PSCCH corresponding to each PSSCH. MODE 2.3.2: A FIRST TIME UNIT IS USED TO TRANSMIT A SECOND-STAGE PSCCH AND SCI

[00382] In some implementations, second-stage ICS include a first information field. The first information field may include R sub-information fields, and the R sub-information fields are used respectively to indicate the HARQ process numbers of PSSCHs R.

[00383] In some implementations, second-stage SCI includes a second information field (or so-called new data indication field). The second information field may include R sub-information fields, and the R sub-information fields are used, respectively, to indicate whether the data transmitted by the R PSSCH is new data.

[00384] In some implementations, second-stage SCIs include a third information field. The third information field may include R sub-information fields, and the R sub-information fields are used, respectively, to indicate redundant versions of data transmitted by R PSSCHs.

[00385] In some implementations, second-stage SCI includes a fourth information field and a fifth information field. The fourth information field is used to indicate a source ID, and the fifth information field... Petition 870250078539, dated 03 / 09 / 2025, page 111 / 580 104 / 241 is used to indicate a target ID, and both the source ID and the target ID are determined based on a Layer 2 ID. For example, if the R PSSCHs do not correspond to the same receiving device, the fifth information field may include R sub-information fields, and the R sub-information fields are used, respectively, to indicate the target IDs corresponding to the R PSSCHs.

[00386] In some implementations, second-stage SCIs include a sixth information field. The sixth information field can be used to indicate the activation or deactivation of side-link feedback, and the indication of the sixth information field is applicable to PSSCHs. The indication information carried by the sixth information field can also be called the HARQ feedback indicator activated / deactivated. In this implementation, the sixth information field can include, for example, 1-bit information.

[00387] In some implementations, second-stage SCIs include a sixth information field. The sixth information field includes R sub-information fields, and the R sub-information fields are used respectively to indicate whether the R PSSCHs activate or deactivate side-link feedback. In this implementation, the sixth information field may include, for example, R bits of information.

[00388] In some implementations, second-stage SCIs include a seventh information field. The seventh information field is used to indicate a cast type, and the indication of the seventh information field is applicable to R PSSCHs. The information carried by the seventh information field can be called the indicator of Petition 870250078539, dated 03 / 09 / 2025, page 112 / 580 105 / 241 type of broadcast. For example, the transmission type includes point-to-point broadcast transmission, broadcast transmission, selective broadcast transmission with ACK / NACK feedback support, and selective broadcast transmission with NACK feedback support only.

[00389] In some implementations, second-stage SCIs include a seventh information field. The seventh information field includes R sub-information fields, and the R sub-information fields are used respectively to indicate a conversion type corresponding to R PSSCHs.

[00390] In some implementations, second-stage SCIs include an eighth information field. The eighth information field is used to indicate whether a receiving device needs to report CSI. The information contained in the eighth information field can be called a CSI request. A value of the eighth information field can include the first value. In a case where the value of the eighth information field is the first value, this may indicate that the transmitting device transmits a CSI-RS and / or that the receiving device needs to report CSI.

[00391] For example, in a case where the value of the eighth information field is a first value (e.g., 1), all transmission resources of R PSSCHs transmitted in the first time unit carry CSI-RS, i.e., the transmitting device transmits CSI-RS in transmission resources of each PSSCH in the R PSSCHs.

[00392] As another example, in a case where the value of the eighth information field is the first value (for example, 1), a target PSSCH of the R PSSCHs transmitted in the first time unit carries the CSI-RS. The target PSSCH can Petition 870250078539, dated 03 / 09 / 2025, p. 113 / 580 106 / 241 to be part of the R PSSCHs, as a PSSCH of the R PSSCHs. For example, the target PSSCH may be the first PSSCH of the R PSSCHs, the last PSSCH of the R PSSCHs, or a PSSCH determined based on configuration information. The configuration information mentioned here may include, for example, one or more configuration information from the feature set, side link BWP configuration information, or PC5 radio feature control (PC5-RRC) signaling. If the target PSSCH is one of the R PSSCHs, the transmitting device transmits a CSI-RS only on the target PSSCH and does not transmit CSI-RS on the remaining PSSCHs.

[00393] In some implementations, second-stage SCIs include a ninth information field. The ninth information field is used to carry the TCI state indication. The ninth information field is used to indicate the beam information used by a transmitting device or can be used by a receiving device to determine the received beam.

[00394] In some implementations, the indication of the ninth information field is applicable to R PSSCHs. That is, the indication information carried in the ninth information field may indicate a TCI state, and the R PSSCHs are all transmitted using the transmission beam corresponding to the TCI state, or a receiving device may use the same receiving beam to receive the R PSSCHs.

[00395] In some implementations, if the R PSSCHs transmitted in a first time unit do not correspond to the same receiving device, the ninth information field includes R sub-information fields, and the R sub-information fields are used respectively to indicate Petition 870250078539, dated 03 / 09 / 2025, p. 114 / 580 107 / 241 TCI states corresponding to the R PSSCHs. In this implementation, the R PSSCHs can be transmitted using different transmission beams, or the receiving device can receive the R PSSCHs using different reception beams.

[00396] In some implementations, if the R PSSCHs transmitted in a first time unit do not correspond to the same spatial domain transmission filter, the ninth information field includes R sub-information fields and the R sub-information fields are used respectively to indicate TCI states corresponding to the R PSSCHs. The TCI states corresponding to the R PSSCHs may be different, i.e., the R PSSCHs may be transmitted using different transmission beams or received using different reception beams.

[00397] In some implementations, if the R PSSCHs transmitted in a first time unit do not correspond to the same receiving device, the ninth information field includes R sub-information fields, and the R sub-information fields are used to determine the spatial domain transmission filter or the spatial domain reception filter corresponding to the R PSSCHs. The spatial domain transmission filters or spatial domain reception filters corresponding to the R PSSCHs may be different, i.e., the R PSSCHs may be transmitted using different transmission beams or received using different reception beams.

[00398] In some implementations, if the R PSSCHs transmitted in a first time unit do not correspond to the same domain transmission filter Petition 870250078539, dated 03 / 09 / 2025, page 115 / 580 108 / 241 spatial, the ninth information field includes R sub-information fields, and the R sub-information fields are used to determine the spatial domain transmission filter or the spatial domain reception filter corresponding to the R PSSCHs. The spatial domain transmission filters or spatial domain reception filters corresponding to the R PSSCHs may be different, i.e., the R PSSCHs may be transmitted using different transmission beams or received using different reception beams.

[00399] The information field of second-stage SCIs is described in detail above. A PSCCH transmitted in the first time unit includes first-stage SCIs. The information field in first-stage SCIs is described in detail below with examples.

[00400] In some implementations, first-stage SCIs include a tenth information field, and the tenth information field is used to indicate an SCI format of the second-stage SCIs.

[00401] In some implementations, first-stage SCIs include an eleventh information field. This eleventh information field is used to carry priority indication information, and the value of the eleventh information field is determined based on the highest or lowest priority of the priorities corresponding to the R PSSCHs. A priority value corresponding to a PSSCH of the R PSSCHs can be determined based on the priority of one or more logical channels corresponding to the PSSCH (e.g., the highest priority of one or more logical channels). If a Medium Access Control Protocol Data Unit (MAC PDU) Petition 870250078539, dated 03 / 09 / 2025, page 116 / 580 109 / 241 associated with the PSSCH include a medium access control element (MAC CE), a priority value corresponding to the PSSCH can be determined based on the priority of one or more logical channels corresponding to the PSSCH and a priority of the MAC CE (for example, the higher priority between the priority of one or more logical channels and the priority of the MAC CE).

[00402] In some implementations, first-stage SCIs include an eleventh information field, the eleventh information field includes R sub-information fields, and the R sub-information fields are used respectively to indicate priorities corresponding to the R PSSCHs. A priority value corresponding to a PSSCH of the R PSSCHs can be determined based on the priority of one or more logical channels corresponding to the PSSCH (e.g., the highest priority of one or more logical channels). If a MAC PDU associated with the PSSCH includes a CE MAC, a priority value corresponding to the PSSCH can be determined based on the priority of one or more logical channels corresponding to the PSSCH and the priority of the CE MAC (e.g., the highest priority between the priority of one or more logical channels and the priority of the CE MAC).

[00403] In some implementations, first-stage SCIs include a twelfth information field, the twelfth information field (e.g., Beta_offset indicator) is used to carry a beta offset indicator, and the beta offset indicator is applicable to second-stage SCIs.

[00404] In some implementations, the SCI of Petition 870250078539, dated 03 / 09 / 2025, page 117 / 580 110 / 241 first stage includes a thirteenth information field, the thirteenth information field (e.g., DMRS port number) is used to indicate the number of DMRS ports and the DMRS port number is applicable to R PSSCHs, i.e., applicable to the DMRS of R PSSCHs.

[00405] In some implementations, first-stage SCIs include a fourteenth information field, the fourteenth information field is used to indicate the MCS, and all R PSSCHs use the MCS indicated by the fourteenth information.

[00406] In some implementations, first-stage SCIs include a fifteenth information field, the fifteenth information field (e.g., additional MCS table indicator) is used to indicate an MCS table, and all R PSSCHs use the MCS table indicated by the fifteenth information field. MODE 2.3.3: A FIRST TIME UNIT IS USED TO TRANSMIT A SECOND-STAGE PSCCH ER SCIs

[00407] In this mode, the second-stage R SCIs correspond one-to-one with the R PSSCHs transmitted in the first time unit.

[00408] In some implementations, the initial position of the second-stage SCI mapping is determined based on one or more of the following: predefined information in a protocol; resource set configuration information; side-link BWP configuration information; or information indicating a terminal device. The terminal device may be a side-link data transmission device or a side-link data receiver device. Petition 870250078539, dated 03 / 09 / 2025, page 118 / 580 111 / 241

[00409] In some implementations, respective second-stage SCIs corresponding to each PSSCH in R are mapped from the first PSSCH DMRS symbol corresponding to each PSSCH.

[00410] In some implementations, the respective second-stage SCIs corresponding to each of the R PSSCHs are mapped from the first symbol corresponding to each PSSCH.

[00411] In some implementations, the first-stage SCIs in the PSCCH include a tenth information field; this tenth information field is used to indicate an SCI format for the second-stage SCIs. Second-stage SCIs may use the same or different SCI formats. For example, if the format of the respective second-stage SCIs corresponding to each PSSCH in the R PSSCHs is the same, the tenth information field can be used to indicate the second-stage SCI format. As another example, if the formats of the second-stage SCIs corresponding to different PSSCHs in the R PSSCHs can be different, the tenth information field can, respectively, indicate a format of the respective second-stage SCIs corresponding to each PSSCH.

[00412] In some implementations, the first-stage SCIs in the PSCCH include an eleventh information field. This eleventh information field is used to carry priority indication information, and the value of this eleventh information field is determined based on the highest or lowest priority of the priorities corresponding to R PSSCHs. A priority value corresponding to a PSSCH of the R PSSCHs can be Petition 870250078539, dated 03 / 09 / 2025, p. 119 / 580 112 / 241 determined based on the priority of one or more logical channels corresponding to the PSSCH (for example, the highest priority of one or more logical channels). If a PDU MAC associated with the PSSCH includes a CE MAC, the priority value corresponding to the PSSCH can be determined based on the priority of one or more logical channels corresponding to the PSSCH and a priority of the CE MAC (for example, the highest priority between the priority of one or more logical channels and the priority of the CE MAC).

[00413] In some implementations, the first-stage SCI in the PSCCH includes an eleventh information field, the eleventh information field includes R sub-information fields, and the R sub-information fields are used respectively to indicate priorities corresponding to the R PSSCHs. A priority value corresponding to a PSSCH of the R PSSCHs can be determined based on the priority of one or more logical channels corresponding to the PSSCH (e.g., the highest priority of one or more logical channels). If a MAC PDU associated with the PSSCH includes a CE MAC, the priority value corresponding to the PSSCH can be determined based on the priority of one or more logical channels corresponding to the PSSCH and the priority of the CE MAC (e.g., the highest priority between the priority of one or more logical channels and the priority of the CE MAC).

[00414] In some implementations, the first-stage SCIs in PSCCH include a twelfth information field; the twelfth information field (e.g., Beta_offset indicator) is used to carry a beta offset indicator and the offset indicator. Petition 870250078539, dated 03 / 09 / 2025, page 120 / 580 113 / 241 beta is applicable to second-stage R SCIs.

[00415] In some implementations, the first-stage SCIs in the PSCCH include a thirteenth information field, the thirteenth information field (e.g., DMRS port number) is used to indicate the number of DMRS ports and the DMRS port number is applicable to R PSSCHs, i.e., applicable to the DMRS of the R PSSCHs.

[00416] In some implementations, the first-stage SCIs in the PSCCH include a fourteenth information field, the fourteenth information field is used to indicate the MCS and all R PSSCHs use the MCS indicated by the fourteenth information.

[00417] In some implementations, the first-stage SCIs in the PSCCH include a fifteenth information field, the fifteenth information field (e.g., additional MCS table indicator) is used to indicate an MCS table and all R PSSCHs use the MCS table indicated by the fifteenth information field.

[00418] Based on the specific examples illustrated in Figures 27 to 31 below, a more detailed illustration of Mode 2.3 is provided. In the examples given in Figures 27 to 31, a plurality of PSSCHs is transmitted in a unit of time, and the plurality of PSSCHs corresponds to different TBs. Each of the pluralities of PSSCHs corresponds to a respective PSCCH and second-stage SCI (for the case where only one PSCCH is transmitted in a unit of time, the PSCCH and PSSCH transmission features can be designed similarly to Figures 23 to 26). Figures 27 to 31 illustrate only the respective PSCCH features corresponding to Petition 870250078539, dated 03 / 09 / 2025, p. 121 / 580 114 / 241 each PSSCH and do not illustrate the transmission capabilities corresponding to second-stage SICs. Furthermore, in the examples in Figures 27 to 31, the first limit value is defined as 3. It should be noted that the examples in Figures 27 to 31 are only intended to assist persons skilled in the art in understanding the embodiments of the present disclosure, and are not intended to limit the embodiments of the present disclosure to the specific numerical values ​​or specific scenarios illustrated. It is evident that those skilled in the art may make various equivalent modifications or alterations based on the examples in Figures 27 to 31, and such modifications or alterations also fall within the scope of the embodiments of the present disclosure.

[00419] With reference to Figure 27, the first time unit can be either time unit #1 or time unit #2 as illustrated in Figure 27. In the example in Figure 27, one time unit includes 2 slots. The allocation of PSSCH resources in a time unit starts from the fifth symbol, i.e., A equals 4. The first 4 symbols of a time unit can be used as AGC, and the last 4 symbols of a time unit are used as GP, i.e., B equals 4. Two PSSCHs are transmitted in one time unit, i.e., each slot is used to transmit one PSSCH. The second slot of time unit #2 includes only one symbol to transmit the PSSCH. Since the number of symbols available for PSSCH transmission included in the second slot of time unit #2 is less than the first limit value, the data transmitted by PSSCH in the slot is repeated data from the first symbol or the last symbol of PSSCH (i.e., PSSCH 1) in the previous slot. Petition 870250078539, dated 03 / 09 / 2025, page 122 / 580 115 / 241

[00420] With reference to Figure 28, the first time unit can be either time unit #1 or time unit #2 illustrated in Figure 28. In the example of Figure 28 shows that a time unit includes 4 slots. The allocation of PSSCH resources in a time unit begins from the fifth symbol, i.e., A equals 4. The first 4 symbols of a time unit can be used as AGC, and the last 4 symbols of a time unit are used as GP, that is, B equals 4. Four PSSCHs are transmitted in one time unit, meaning each slot is used to transmit one PSSCH. The fourth slot of time unit #2 includes only 1 symbol for PSSCH transmission. Since the number of symbols available for PSSCH transmission in the fourth slot of time unit #2 is less than the first limit value, the data transmitted by the PSSCH in the slot is repeated data from the first symbol or the last symbol of the PSSCH (i.e., PSSCH 3) in the previous slot.

[00421] With reference to Figure 29, the first time unit can be a time unit #1 or a time unit #2 illustrated in Figure 29. In the example in Figure 29, a time unit includes 4 slots. The allocation of PSSCH resources in a time unit starts from the fifth symbol, i.e., A equals 4. The first 4 symbols of a time unit can be used as AGC, and the last 4 symbols of a time unit are used as GP, i.e., B equals 4. Two PSSCHs are transmitted in a time unit, i.e., every two slots are used to transmit one PSSCH. In a time unit, the first two slots transmit PSSCH 1 and the last two slots transmit PSSCH 2. The PSSCH transmission resources are Petition 870250078539, dated 03 / 09 / 2025, page 123 / 580 116 / 241 included in time unit #2.

[00422] With reference to Figure 30, the first time unit can be either time unit #1 or time unit #2 as illustrated in Figure 30. In the example in Figure 30, one time unit includes 4 slots. The allocation of PSSCH resources in a time unit starts from the ninth symbol, i.e., A equals 8. The first 8 symbols in a time unit can be used as AGC, and the last 8 symbols in a time unit are used as GP, i.e., B equals 8. Two PSSCHs are transmitted in one time unit, i.e., every two slots are used to transmit one PSSCH. The PSFCH transmission resources are included in time unit #2. The third slot of time unit #2 includes 3 symbols to transmit the PSSCH.Since the number of symbols available to transmit the PSSCH included in the third slot of time unit #2 is equal to the first limit value, this slot (slot (n+6) in Figure 30) can transmit the PSSCH, i.e., PSSCH 2 illustrated in Figure 30.

[00423] With reference to Figure 31, the first time unit can be either time unit #1 or time unit #2 as illustrated in Figure 31. In the example in Figure 31, one time unit includes 4 slots. The allocation of PSSCH resources in a time unit starts from the ninth symbol, i.e., A equals 8. The first 8 symbols in a time unit can be used as AGC, and the last 8 symbols in a time unit are used as GP, i.e., B equals 8. Two PSSCHs are transmitted in a time unit, i.e., every two slots are used to transmit one PSSCH. The transmission resources of PSSCH Petition 870250078539, dated 03 / 09 / 2025, page 124 / 580 117 / 241 are included in time unit #2. The third slot of time unit #2 includes 3 symbols for transmitting the PSSCH. Since the number of symbols available for transmitting the PSSCH included in the third slot of time unit #2 is equal to the first limit value, this slot (i.e., slot (n+6) in Figure 31) can transmit the PSSCH, i.e., PSSCH 2 illustrated in Figure 31. A symbol used as GP (i.e., the third guard symbol) is included between two adjacent PSSCHs in a time unit. The symbol can be used by the transmitting device to switch the transmission beam.

[00424] Mode 2.3 uses the first time unit to transmit a plurality of TBs, which can improve the peak rate of the communication system. MODE 3: A METHOD OF DETERMINING TBS

[00425] The content above describes in detail the method of transmitting PSSCH in conjunction with Mode 2. For PSSCH transmission, it is necessary to determine the TBS corresponding to the PSSCH. The TBS corresponding to the PSSCH can be determined based on the transmission resources corresponding to the PSSCH. It should be understood that, in the absence of conflict, Mode 3 can be applied to various modes in Mode 2.

[00426] In some implementations, the TBS corresponding to PSSCH in the first time unit can be determined based on one or more of a first parameter to a fourth parameter (for detailed descriptions of the first parameter and the fourth parameter, the following content can be consulted).

[00427] In some implementations, the first Petition 870250078539, dated 03 / 09 / 2025, p. 125 / 580 The 118 / 241 parameter can be determined based on the number of resource elements (REs). Alternatively, the first parameter can represent the number of ERs. For example, the first parameter can represent the number of REs available for PSSCH transmission in a PRB or a frequency band (e.g., 12 subcarriers) corresponding to a PRB. The first parameter can be represented, for example, as NRE. The number of REs included in the PSSCH transmission resources (or the number of REs available for PSSCH transmission in the assigned PSSCH transmission resources) can be determined based on the first parameter.

[00428] In some implementations, the second parameter can be determined based on the number of PRBs. Alternatively, the second parameter can represent the number of PRBs. The second parameter can be represented, for example, as nPRB.

[00429] In some implementations, the third parameter can be determined based on the transmission resources occupied by the PSCCH (e.g., the number of REs occupied by the PSCCH). Alternatively, the third parameter can represent the transmission resources occupied by the PSCCH. The third parameter can be represented, for example, as N^^1'1. For a detailed description of the third parameter, see Mode 3.2 below.

[00430] In some implementations, the fourth parameter can be determined based on the transmission resources occupied by the second-stage SCIs (e.g., the number of REs occupied by the second-stage SCIs). Alternatively, the fourth parameter can Petition 870250078539, dated 03 / 09 / 2025, page 126 / 580 119 / 241 represent the transmission resources occupied by the second-stage SCIs. The fourth parameter can be represented, for example, as N^1'2. For a detailed description of the fourth parameter, see Mode 3.3 below. MODE 3.1: A FIRST PARAMETER (A PARAMETER DETERMINED BASED ON THE NUMBER OF REs)

[00431] In some implementations, the first parameter may be determined based on one or more of the fifth through eighth parameters (for detailed descriptions of the fifth and eighth parameters, see the following content).

[00432] In some implementations, the fifth parameter may be determined based on the number of symbols available for PSSCH transmission. Alternatively, the fifth parameter may represent the number of symbols available for PSSCH transmission. The fifth parameter nrPSSCH may be represented, for example, as Nsimb.

[00433] In some implementations, the sixth parameter can be determined based on the number of subcarriers in a PRB (e.g., 12). Alternatively, the sixth parameter can represent the number of subcarriers in a PRB. The sixth parameter can be represented, for example, as NS^B.

[00434] In some implementations, the seventh parameter may be determined based on an overhead in a PRB or in a frequency domain band corresponding to a PRB. Alternatively, the seventh parameter may represent an overhead in a PRB or a frequency domain band (e.g., 12 subcarriers) corresponding to a PRB. The seventh parameter may be Petition 870250078539, dated 03 / 09 / 2025, page 127 / 580 120 / 241 represented, for example, as W(f / ?s). Alternatively, the seventh parameter may represent the number of REs that cannot be used for PSSCH transmission in a PRB or a band in the frequency domain corresponding to a PRB, or the number of REs occupied by other reference signals (e.g., CSI-RS and / or phase tracking reference signal (PT-RS)).

[00435] In some implementations, the seventh parameter can be determined based on preconfigured information or network device configuration information. For example, the seventh parameter can be determined based on the high-level parameter sl-X-Overhead.

[00436] In some implementations, the eighth parameter may be determined based on the number of REs occupied by a DMRS in a PRB or in a frequency domain band (e.g., 12 subcarriers) corresponding to a PRB. Alternatively, the eighth parameter may represent the number of REs occupied by a DMRS in a PRB or a frequency domain band corresponding to a PRB. Alternatively, the eighth parameter is determined based on the number of REs corresponding to one or more DMRS patterns of the PSSCH DMRS. The eighth parameter may be represented, for example, as N^E^5.

[00437] In some implementations, the eighth parameter may be determined based on preconfigured information or network device configuration information. For example, the eighth parameter may be determined based on DMRS pattern indication information in the feature set configuration information.

[00438] As an example, the first parameter NEE Petition 870250078539, dated 03 / 09 / 2025, page 128 / 580 121 / 241 can be determined based on the following equation: i\t' _ RI BB . rjPSSHH \rPRB ktDMRSNRE =NscNsímbNohNRE ~.ss trPSSHH

[00439] In the equation above, Nsm.n represents the fifth parameter and, for the method of determining the fifth parameter, the following content can be referred to; Nrb represents the sixth parameter and NRcB= 12 ; Nrrb represents the seventh parameter; NRE^5 represents the eighth parameter.

[00440] Below is a more detailed example of how to determine the fifth parameter.

[00441] In some implementations, the fifth parameter can be determined based on one or more of: predefined information in a protocol; preconfigured information; configuration information from a network device; and indication information sent by a terminal device transmitting the PSSCH. For example, feature set configuration information includes indication information, where the indication information is used to indicate a value for the fifth parameter. As another example, feature set configuration information includes indication information, where the indication information is used to indicate the number of PSSCH symbols or the number of reference symbols used in a case where TBS determination, and the value of the fifth parameter can be determined based on the indication information.

[00442] In some implementations, the fifth parameter may be determined based on one or more of the ninth parameter to the fifteenth parameter (for a detailed description of the ninth parameter to the fifteenth parameter, the following content may be consulted). Petition 870250078539, dated 03 / 09 / 2025, page 129 / 580 122 / 241

[00443] In some implementations, the ninth parameter can be determined based on the number of slots corresponding to the transmission resources occupied by a PSSCH. Alternatively, the ninth parameter can represent the number of time slots corresponding to the transmission media occupied by a PSSCH. The ninth parameter can be represented as NSlot. For example, if the first time unit is used to transmit one PSSCH, the value of the ninth parameter can be M. As another example, if the first time unit is used to transmit R PSSCHs, the value of the ninth parameter can be S, where S=M / R.

[00444] In some implementations, the tenth parameter can be determined based on the number of symbols included in a slot. Alternatively, the tenth parameter can represent the number of symbols included in a slot. The tenth parameter can be represented, for example, as ioslot^symbol.

[00445] In some implementations, the eleventh parameter can be determined based on the number of symbols used as AGC. Alternatively, the eleventh parameter can represent the number of symbols used as AGC. Alternatively, the eleventh parameter can be determined based on the AGC overhead. Alternatively, the eleventh parameter can represent the AGC overhead. Alternatively, the eleventh parameter is determined based on a time interval between the first symbol for PSSCH transmission and the first symbol in the first time unit. The eleventh parameter can be represented, for example, as NSymbol. As an example, the eleventh parameter can be determined with Petition 870250078539, dated 03 / 09 / 2025, page 130 / 580 123 / 241 based on configuration information. Configuration information can be used to indicate the number of symbols for AGC that need to be considered to determine the TBS or the number of symbols corresponding to the AGC overhead. Configuration information can be, for example, side link BWP configuration information and / or feature set configuration information.

[00446] In some implementations, the twelfth parameter may be determined based on the number of symbols to which the guard symbol corresponds. Alternatively, the twelfth parameter may indicate the number of symbols corresponding to the guard symbol. Alternatively, the twelfth parameter may be determined based on the overload of guard symbols. Alternatively, the twelfth parameter may represent an overload of guard symbols. The twelfth parameter may be represented, for example, as N,^δοΖο. As an example, the twelfth parameter may be determined based on configuration information.Configuration information is used to indicate the number of symbols corresponding to the protection symbols that need to be considered in a TBS determination case, or configuration information is used to indicate the number of symbols corresponding to the overload of the protection symbols that need to be considered in a TBS determination case. Configuration information may be, for example, side-link BWP configuration information and / or feature set configuration information. Petition 870250078539, dated 03 / 09 / 2025, page 131 / 580 124 / 241

[00447] In some implementations, the thirteenth parameter can be determined based on the time-domain features corresponding to the PSFCH. Alternatively, the thirteenth parameter can represent the time-domain resources corresponding to the PSFCH. The thirteenth parameter can be represented, for example, as ^símo. The value of the thirteenth parameter can be determined based on one or more of the following: indication information from a transmitting device, configuration information from the resource set, and configuration information from the side-link BWP. For example, in a case where the number of A symbols used as AGC in a time unit is equal to 4, the number of B symbols used as GP is equal to 4, and one symbol in the time unit is used to transmit the PSFCH, a value of the thirteenth parameter can be 9 (A+B+1, i.e., a sum of the number of symbols used as AGC, the number of symbols used as GP, and the number of symbols used for PSFCH transmission) or 0.For example, the value of the thirteenth parameter can be determined based on the information provided in the SCI.

[00448] In some implementations, the fourteenth parameter can be determined based on a time interval between the first symbol corresponding to a PSSCH transmission resource and the first symbol in a time unit. Alternatively, the fourteenth parameter can represent a time interval between the first symbol corresponding to the PSSCH transmission resource and the first symbol in a time unit. The fourteenth parameter can be used equivalently or Petition 870250078539, dated 03 / 09 / 2025, page 132 / 580 125 / 241 interchangeable with the eleventh parameter.

[00449] In some implementations, the fifteenth parameter can be determined based on the number of repeated data symbols used to transmit PSSCH data in a time unit. Alternatively, the fifteenth parameter can represent the number of repeated data symbols used to transmit PSSCH data in a time unit. For example, referring to Figure 27, the second slot of time unit #2 includes only one symbol to transmit PSSCH. Since the number of symbols available for PSSCH transmission included in the second slot of time unit #2 is less than the first threshold value, the data transmitted by PSSCH in the slot is repeated data from the first symbol or the last symbol of PSSCH (i.e., PSSCH 1) in the previous slot. Therefore, in the example in Figure 27, a value for the fifteenth parameter could be 1. As another example, referring to Figure 28, the fourth slot of time unit #2 includes only 1 symbol to transmit PSSCH.Since the number of symbols available for PSSCH transmission in the fourth slot of time unit #2 is less than the first limit value, the data transmitted by PSSCH in the slot is repeated data from the first symbol or the last symbol of PSSCH (i.e., PSSCH 3) in the previous slot. Therefore, in the example in Figure 28, the value of the fifteenth parameter can be 1.

[00450] A specific example of how to determine the fifth parameter is given below.

[00451] For example, the first time unit includes 2 slots and the 2 slots are used to transmit a PSSCH. In the first time unit, the number A of symbols Petition 870250078539, dated 03 / 09 / 2025, p. 133 / 580 126 / 241 used as AGC equals 4, and the number B of symbols used as guard symbols equals 4. One of the two slots includes symbols. If the PSFCH period is configured as a time unit, i.e., each time unit includes PSFCH resources, the fifth parameter (i.e., the number of symbols available to transmit the PSSCH in the first time unit) can be determined according to the following equation: ^PSSCH =npssch ·Nsiot - -nagc - -Ngp - -npsfchJ'simfc s'olot symbol symbol symbol symbol rSSCH ~ mP.CWH ,

[00452] In the equation above, NSlot represents the ninth mPSSHH mAGG. parameter and Nslot= 2 ; Nsymbol represents the eleventh parameter and NAmcolo= 4 ; NS^bolo represents the twelfth *tGP λ atPSFHH parameter and N!^mbolo= 4 ; Nimb represents the thirteenth parameter and N�^£H= 9. MODE 3.2: THIRD PARAMETER (PARAMETER (Determined based on the transmission resources occupied by a PSCCH)

[00453] In some implementations, the third parameter (denoted as N^1'1) can be determined according to the transmission resources occupied by the PSCCH (denoted as N'^'1). The transmission resources occupied by the PSCCH may include the transmission resources occupied by the PSCCH and the transmission resources occupied by the PSCCH DMRS.

[00454] In some implementations, the third parameter may be represented by the number of REs.

[00455] In some implementations, if a PSSCH is transmitted in the first time unit and only one PSCCH is transmitted in the first time unit, the Petition 870250078539, dated 03 / 09 / 2025, page 134 / 580 The third parameter, 127 / 241, is determined based on the transmission resources occupied by a PSCCH. In this implementation, nRR1'1 can be equal to N'RR'1. Alternatively, nRR1'1 and N'RR1,1 can be understood as the same parameter. In this case, N'Re'1 is determined based on the transmission resources occupied by the PSCCH.

[00456] In some implementations, if the first time unit is used to transmit a plurality of PSSCHs, and the plurality of PSSCHs corresponds to the same TB, and the first time unit transmits only one PSCCH, the third parameter is determined based on the transmission resources occupied by one PSCCH. In this implementation, nRR1'1 can be equal to N'RR1,1. Alternatively, nRR1'1 and N'RRr1'1 can be understood as the same parameter. In this case, N'RR1,1 is determined based on the transmission resources occupied by the PSCCH.

[00457] In some implementations, if the first time unit is used to transmit a plurality of PSSCHs, and the plurality of PSSCHs corresponds to different pluralities of TBs, and the first time unit transmits only one PSCCH, the third parameter is determined based on the transmission resources occupied by one PSCCH. In this implementation, nRR1'1 is equal to N'Rr1'1. Alternatively, nRR1'1 and N'RR1'1 can be understood as the same parameter. In this case, N'Rr1'1 is determined based on the transmission resources occupied by the PSCCH.

[00458] In some implementations, if the first time unit is used to transmit a plurality of PSSCHs, and the plurality of PSSCHs corresponds to different Petition 870250078539, dated 03 / 09 / 2025, p. 135 / 580 128 / 241 pluralities of TBs, and the first time unit transmitting a plurality of PSCCHs, the third parameter is determined based on the transmission resources occupied by the PSCCH corresponding to the PSSCH. For example, NEE1'1 is equal to N'^1'1 (or, Nre1'1 and N'^1'1 can be understood as the same parameter), at this point, N'^1'1 is determined based on the transmission resources occupied by the PSCCH corresponding to the PSSCH. Alternatively, the third parameter is determined based on one or more of the following: the sum of the transmission resources occupied by the plurality of PSCCHs, and the number of the plurality of PSCCHs (or the number of TBs transmitted in the first time unit, i.e., the value of R).For example, NEE1,1= Σί?=1N'ρ| / ,ί1 / R , where N'E^'E is determined based on the number of RE corresponding to the transmission resources of the i-th PSCCH, that is, in a case where the TBS of the PSSCH is determined, it is determined based on the average value of the number of RE of the transmission resources of all PSCCH transmitted in the first time unit. MODE 3.3: A FOURTH PARAMETER (A PARAMETER DETERMINED BASED ON THE TRANSMISSION RESOURCES OCCUPIED BY THE SECOND-STAGE SCIs)

[00459] In some implementations, the fourth parameter (denoted as NE1'2) can be determined according to the transmission resources occupied by the second-stage SCIs (denoted as N'^'2).

[00460] In some implementations, the fourth parameter may be represented by the number of REs.

[00461] In some implementations, if a PSSCH is transmitted in the first time unit and only SCI of Petition 870250078539, dated 03 / 09 / 2025, page 136 / 580 If 129 / 241 second-stage signals are transmitted in the first time unit, the fourth parameter is determined based on the transmission resources occupied by the second-stage SCIs. For example, NeE1,2 is equal to N'^CE1,2. Alternatively, Nj^E1,2 and N'^1'2 can be understood as the same parameter. In this case, N'rCe'2 is determined based on the transmission resources occupied by the second-stage SCIs.

[00462] In some implementations, if the first time unit is used to transmit a plurality of PSSCHs, and the plurality of PSSCHs corresponds to the same TB, and the first time unit transmits only second-stage SCIs, the fourth parameter is determined based on the transmission resources occupied by the second-stage SCIs. For example, N / E7,2 is equal to N'^1'2. Alternatively, Nr^'2 and N'^'2 can be understood as the same parameter. In this case, N'^1'2 is determined based on the transmission resources occupied by the second-stage SCIs.

[00463] In some implementations, if the first time unit is used to transmit a plurality of PSSCHs, and the plurality of PSSCHs corresponds to different pluralities of TBs, and the first time unit transmits only second-stage SCIs, the fourth parameter is determined based on the transmission resources occupied by the second-stage SCIs. For example, N^1'2 is equal to N're'2. Alternatively, NE7'2 and N'^1,2 can be understood as the same parameter. In this case, N'ECE1,2 is determined based on the transmission resources occupied by the second-stage SCIs.

[00464] In some implementations, if the first Petition 870250078539, dated 03 / 09 / 2025, page 137 / 580 If a 130 / 241 time unit is used to transmit a plurality of PSSCHs, and the plurality of PSSCHs corresponds to different pluralities of TBs, and the first time unit transmits a plurality of second-stage SCIs, the fourth parameter is determined based on the transmission resources occupied by the second-stage SCIs corresponding to the PSSCH. For example, N^^E1,2 is equal to N'RCE1,2 (alternatively, N^'2 and N'^E'2 can be understood as the same parameter), at this point, N'^E1'2 is determined based on the transmission resources occupied by the second-stage SCIs corresponding to the PSSCH. Alternatively, the fourth parameter is determined based on one or more of the following: the sum of the transmission resources occupied by a plurality of second-stage SCIs and the number of second-stage SCI pluralities (or the number of TBs transmitted in the first time unit, i.e., the value of R).For example, N^E1'2= Σί=1n'srCI:2 / r , where N'^·2 is determined based on the number of RE corresponding to the transmission resources of the i-th second-stage SCIs, that is, in a case where the TBS of the PSSCH is determined, it is determined based on the average number of RE of the transmission resources of all second-stage SCIs transmitted in the first time unit.

[00465] Along with a specific example, a specific method for determining the number of NRE and RE included in the PSSCH transmission resources is provided below.

[00466] For example, the number of NREde RE included in the PSSCH transmission resources can be determined by the following equation: Petition 870250078539, dated 03 / 09 / 2025, page 138 / 580 131 / 241

[00467] Nre= NRe· nPRB- N™'1- N™'2 [004 68] In the equation above, N^1'1 is determined based on N'^'1 (the method for determining the third parameter can be consulted for details), NRE1'2 is determined based on N'RE'2 (the method for determining the fourth parameter can be consulted for details).

[00469] N'RCe1,2 can be determined by the following equation: QSCI2 = min(OsCI2 -I- I „„,.,} cRci? + L'SCteJ P displacementsCI2. m >SCH|\ nbolo1I Σ <ci2(o[ &) ^PSSCH ^símbolo

[00470] Here, QsCI2 indicates the number of symbols after the second-stage SCTs are encoded and modulated. N're' is equal to Q'sCI2; OscI2 indicates the number of information bits corresponding to the second-stage SCIs. LsCI2 indicates the number of bits of the cyclic redundancy check (CRC) of the second-stage SCIs. PdesiOcamento can be determined based on the information indicated by the “Beta_offset indicator” in the first-stage SCIs. MBcS'CCH(lJ) indicates the number of subcarriers corresponding to the resources in the frequency domain of the PSSCH. MgCCCH(l'J) indicates the number of subcarriers corresponding to the resources in the frequency domain of the PSCCH. MSc12)!) indicates the number of REs that can be used to transmit the second-stage SCIs in a symbol l, l = 0, 1, 2 —, NSíRmSiRO)1^) — 1, NSRRmSR'O)1^) can be determined based on the fifth parameter. S^s212)!.^ = MCS2SCHJIR) - MSCCCH(IJ . γ indicates the number of blank REs in the PRB where the last symbol of the second-stage SCI is located. R is the Petition 870250078539, dated 03 / 09 / 2025, page 139 / 580 132 / 241 code rate determined based on MCS indication information in first-stage SCIs. a is determined based on high-level configuration parameters. MODALITY 4: A LATERAL LINK FEEDBACK MECHANISM BASED ON A FIRST TIME UNIT

[00471] It should be understood that the side-link feedback mechanism described in Mode 4 can be implemented based on the time unit structure, including the PSFCH transmission feature provided in Mode 1, and, in the absence of conflict, the content of Mode 4 can be combined with the content of Mode 1. For example, the first A symbols of the first time unit in Mode 4 can be used as AGC. As another example, the last B symbols of the first time unit in Mode 4 are guard symbols and can be used as GP. Furthermore, in the absence of conflict, the side-link feedback mechanism described in Mode 4 can be arbitrarily combined with the PSSCH transmission method and the TBS determination method provided in Mode 2 and Mode 3. For example, the first time unit can simultaneously transmit PSSCH and PSFCH.The PSSCH can be transmitted based on the method described in Mode 2, and the TBS can be determined based on the method described in Mode 3. The PSFCH can perform side-link feedback based on the side-link feedback mechanism described in Mode 4. As another example, the first time unit can transmit the PSFCH that is available to perform side-link feedback on the PSSCH transmitted in Mode 4. Petition 870250078539, dated 03 / 09 / 2025, page 140 / 580 133 / 241 second time unit. The second time unit can transmit the PSSCH based on the method described in mode 2 and determine the TBS based on the method described in mode 3. The first time unit can transmit the PSFCH based on the method described in mode 4, thus performing side-link feedback based on the time unit.

[00472] Figure 32 is a schematic flowchart of a side link transmission method provided in embodiments of the present disclosure. The method illustrated in Figure 32 can be performed by a first terminal device. The first terminal device can be any type of terminal device, such as terminal device 120 in Figure 1.

[00473] The method in Figure 32 includes an S3210 step, that is, a first terminal device receives or transmits a first PSFCH in a first unit of time.

[00474] It should be noted that the first PSFCH in the embodiments of the present disclosure is used to carry side-link feedback information or conflict indication information, which is not limited to the embodiments of the present disclosure. The following description is made taking the first PSFCH used to carry side-link feedback information as an example.

[00475] In some implementations, the first PSFCH is used to carry the first side-link feedback information corresponding to one or more PSSCHs in a second time unit. The first side-link feedback information may be the Petition 870250078539, dated 03 / 09 / 2025, page 141 / 580 134 / 241 information from HARQ.

[00476] Similar to the first time unit, the second time unit is also a time unit including M consecutive slots. The descriptions of the first time unit mentioned in various embodiments of the present disclosure can be applied to the second time unit.

[00477] In general, the format of a PSFCH can be defined from one or more perspectives, such as the number of bits of side-link feedback information included in the PSFCH, the frequency domain resource occupied by the PSFCH, and the time domain resource occupied by the PSFCH. This modality does not specifically limit the format of the first PSFCH transmitted in the first time unit and can be designed according to actual needs. In conjunction with Modality 4.1 to Modality 4.3, the format of the first PSFCH is described in detail from a plurality of perspectives. MODE 4.1: THE NUMBER OF BITS OF SIDE-LINK FEEDBACK INFORMATION CARRIED BY A FIRST PSFCH

[00478] As mentioned above, the first PSFCH is used to carry the first side-link feedback information. The first side-link feedback information is used to perform side-link feedback in one or more PSSCHs in the second time unit.

[00479] In some implementations, the first side-link feedback information may be 1-bit side-link feedback information. Petition 870250078539, dated 03 / 09 / 2025, page 142 / 580 135 / 241

[00480] In some implementations, the first side-link feedback information may be side-link feedback information of a plurality of bits.

[00481] In some implementations, the number of bits included in the first side-link feedback information can be determined based on the number of TBs transmitted in the second time unit. For example, if the second time unit transmits one TB, the first side-link feedback information is 1 bit of side-link feedback information; if the second time unit transmits a plurality of TBs, the first side-link feedback information is a plurality of bits of side-link feedback information. That is, the number of bits included in the first side-link feedback information can be equal to the number of TBs transmitted in the second time unit.

[00482] The number of bits of the first side-link feedback information is different, and the feedback form corresponding to the first PSFCH may be different, which is described below in conjunction with a plurality of modes. MODE 4.1.1: THE FIRST SIDE-LINK FEEDBACK INFORMATION IS 1-BIT SIDE-LINK FEEDBACK INFORMATION

[00483] In some implementations, one or more PSSCHs in the second time unit are used to transport a TB (see the description of Mode 2.1 and Mode 2.2 above). In this case, the first Petition 870250078539, dated 03 / 09 / 2025, page 143 / 580 136 / 241 side-link feedback information can be the side-link feedback information corresponding to the TB. For example, the value corresponding to ACK is 1 and the value corresponding to NACK is 0. If the TB is received correctly, the value of the first 1-bit side-link feedback information is 1, indicating ACK; if the TB is not received correctly, the value of the first 1-bit side-link feedback is 0, indicating NACK.

[00484] In some implementations, one or more PSSCHs in the second time unit are used to carry a plurality of TBs (see the description of Mode 2.3 above). In this case, the first side-link feedback information can be determined based on the side-link feedback information corresponding to a plurality of TBs. For example, the packing process can be performed on the side-link feedback information corresponding to a plurality of TBs. There are many ways to perform the packing process, for example, the packing process can be performed on the side-link feedback information corresponding to a plurality of TBs based on an AND operation or an OR operation to obtain a 1-bit operation result.By grouping bit-plurality-of-bit side-link feedback information into 1-bit side-link feedback information and performing feedback via a PSFCH, the feedback mechanism of the PSFCH format (i.e., PSFCH 0 format, in which the PSFCH carries 1-bit feedback information) Petition 870250078539, dated 03 / 09 / 2025, page 144 / 580 The 137 / 241 bit) provided by the related technology can be used to a greater extent.

[00485] For example, as a possible implementation, the first side-link feedback information is determined based on the result of the AND operation of the side-link feedback information corresponding to a plurality of TBs. If the side-link feedback information corresponding to a plurality of TBs is all ACK, the value of the first side-link feedback information will be a first value (for example, it might be 1). As another example, if the side-link feedback information corresponding to at least one TB of a plurality of TBs is NACK, the value of the first side-link feedback information will be a second value (for example, it might be 0).As a more specific example, if a bit of the first side-link feedback information takes the value of 1 to indicate ACK and takes the value of 0 to indicate NACK, and the second time unit transmits 4 TBs, corresponding to 4 bits of side-link feedback information respectively, the result of the “AND operation” is 1 only when the 4 bits of side-link feedback information are all ACK (i.e., the values ​​of the 4 bits of side-link feedback information are all 1), otherwise, the result of the “AND operation” is 0.

[00486] As another example, as another possible implementation, the first side-link feedback information is determined based on a result of the OR operation of the information from Petition 870250078539, dated 03 / 09 / 2025, page 145 / 580 138 / 241 side-link feedback corresponding to a plurality of TBs. For example, if at least one side-link feedback piece of the side-link feedback information corresponding to the plurality of TBs is ACK, the value of the first side-link feedback piece is a first value (for example, it might be 1). As another example, if the side-link feedback information corresponding to the plurality of TBs is all NACK, the value of the first side-link feedback piece is a second value (for example, it might be 0).As a more specific example, if one bit of the first side-link feedback information has a value of 1 to indicate ACK and a value of 0 to indicate NACK, and the second time unit transmits 4 TBs corresponding to the 4-bit side-link feedback information, respectively, if the 4-bit side-link feedback information includes ACK (that is, at least one bit of side-link feedback information takes a value of 1), the result of the OR operation is... 1; otherwise, the result of the OR operation is 0.

[00487] In some implementations, one or more PSSCHs in the second time unit are used to carry a plurality of TBs (see the description of Modality 2.3 above). The plurality of PSSCHs corresponds to a plurality of PSFCHs, respectively (the first PSFCH may be one of the plurality of PSFCHs), and the plurality of PSFCHs is used to carry side-link feedback information corresponding to the plurality of TBs, respectively. The plurality of PSFCHs Petition 870250078539, dated 03 / 09 / 2025, p. 146 / 580 139 / 241 can be used to perform side-link feedback simultaneously across a plurality of PSFCHs.

[00488] In some implementations, the entire plurality of PSFCHs may contain 1-bit side-link feedback information. In this way, the PSFCH format feedback mechanism (i.e., PSFCH 0 format, in which the PSFCH carries 1-bit feedback information) provided by the related technology may be used to a greater extent.

[00489] The plurality of PSFCHs can be distinguished by one or more time domains, frequency domain and code domain.

[00490] In some implementations, the time-domain features corresponding to the plurality of PSFCHs are the same, and the frequency-domain features corresponding to the plurality of PSFCHs are different. An example corresponding to this implementation method is given below in conjunction with Figure 33, and the details are described below.

[00491] In some implementations, the time-domain resources corresponding to the plurality of PSFCHs are the same, and the code-domain resources corresponding to the plurality of PSFCHs are different.

[00492] In some implementations, the time-domain resources corresponding to the plurality of PSFCHs are different, and the frequency-domain resources corresponding to the plurality of PSFCHs are the same.

[00493] In some implementations, the time-domain resources corresponding to the plurality of PSFCHs are different and the frequency-domain resources Petition 870250078539, dated 03 / 09 / 2025, p. 147 / 580 140 / 241 corresponding to the plurality of PSFCHs are different. An example corresponding to this implementation method is given below in conjunction with Figure 34, and the details are described below.

[00494] In some implementations, the time-domain resources corresponding to the plurality of PSFCHs are different, and the code-domain resources corresponding to the plurality of PSFCHs are different. MODALITY 4.1.2: INITIAL INFORMATION OF SIDE-LINK FEEDBACK IS THE SIDE-LINK FEEDBACK INFORMATION OF A BITS' PLURALITY

[00495] In some implementations, one or more PSSCHs in the second time unit are used to carry a plurality of TBs (see the description of Mode 2.3 above). Correspondingly, the side-link feedback information of a bits' plurality in the first PSSCH corresponds to the plurality of TBs, respectively. That is, the side-link feedback information of the bits' plurality is used respectively to indicate the side-link feedback results corresponding to the plurality of TBs. An example corresponding to this implementation is given below in conjunction with Figure 35, and the details are described below. MODALITY 4.2: RESOURCES IN THE FREQUENCY DOMAIN OF A FIRST PSFCH

[00496] In some implementations, the first PSFCH occupies a PRB in the frequency domain.

[00497] In some implementations, if the first PSFCH occupies a PRB in the frequency domain, the first Petition 870250078539, dated 03 / 09 / 2025, page 148 / 580 141 / 241 PSFCH can carry the first side-link feedback information based on a first sequence. The length of the first sequence is determined based on the number of subcarriers included in a PRB. For example, the length of the first sequence is equal to the number of subcarriers included in a PRB. The first sequence can be mapped to a PRB occupied by the first PSFCH.

[00498] In some implementations, the first PSFCH occupies a plurality of PRBs in the frequency domain.

[00499] In some implementations, if the first PSFCH occupies a plurality of PRBs in the frequency domain, the first PSFCH may carry the first side-link feedback information based on the first sequence. A length of the first sequence can be determined based on the number of subcarriers included in a PRB (e.g., the length of the first sequence is equal to the number of subcarriers included in a PRB, as the length of the first sequence is equal to 12). The first sequence can be mapped to a PRB (hereinafter referred to as PRB 1) from a plurality of PRBs occupied by the first PSFCH, and the data in the remaining PRBs from the plurality of PRBs other than PRB 1 can be determined based on the first sequence. For example, the data in each of the remaining PRBs may be repeated data from the data transmitted in PRB 1.As another example, the data in each PRB in the remaining PRBs can be determined based on multiplying the first sequence by a rotation factor.

[00500] In some implementations, if the first PSFCH occupies a plurality of PRBs in the frequency domain, Petition 870250078539, dated 03 / 09 / 2025, page 149 / 580 142 / 241 The first PSFCH carries the first side-link feedback information based on a second sequence. The length of the second sequence can be determined based on the product of the number of PRB pluralities and the number of subcarriers included in a PRB. For example, the length of the second sequence could be equal to the product of the number of PRB pluralities and the number of subcarriers included in a PRB. As another example, the length of the second sequence could be determined based on a maximum prime number that is less than or equal to the product of the number of PRB pluralities and the number of subcarriers included in a PRB. For example, assuming the product of the number of PRB pluralities and the number of subcarriers included in a PRB is 132, the length of the second sequence could be 131.After determining the length of the second sequence, the second sequence can be mapped to the plurality of PRBs occupied by the first PSFCH.

[00501] It should be noted that Mode 4.2 can be arbitrarily combined with Mode 4.1. For example, in a case where the first PSFCH includes 1-bit information, the first PSFCH can occupy a PRB in the frequency domain or it can occupy a plurality of PRBs in the frequency domain. As another example, in a case where the first PSFCH includes information of a plurality of bits, the first PSFCH can occupy a PRB or a plurality of PRBs in the frequency domain. MODALITY 4.3: RESOURCES IN THE TIME DOMAIN OF PSFCH IN A FIRST TIME UNIT (RESOURCES IN THE TIME DOMAIN OF PSFCH INCLUDE RESOURCES IN THE DOMAIN OF Petition 870250078539, dated 03 / 09 / 2025, pp. 150 / 580 143 / 241 TIMES CORRESPONDING TO THE FIRST PSFCH)

[00502] In some implementations, the time-domain resources of the PSFCH in the first time unit may include K symbols. The K symbols may include K1 symbols and K2 symbols. The K1 symbols are used to transmit the PSFCH, and the data in the K2 symbols are repeated data from the data in the K1 symbols, where K1 and K2 are positive integers, and K is equal to the sum of K1 and K2. The value of K1 may be 1 or greater than 1 (for example, it may be 2 or A). For the introduction of K, K1, and K2, see Mode 1.4 above, which will not be described in detail here.

[00503] In some implementations, the value of K1 is determined based on the number of TBs transmitted in the second time unit. For example, in a case where the second time unit transmits one TB, the value of K1 is 1; in a case where the second time unit transmits a plurality of TBs, the value of K1 is greater than 1. That is, K1 can be equal to the number of TBs transmitted in the second time unit.

[00504] In some implementations, the value of K is determined based on the number of TBs transmitted in the second time unit. For example, in a case where the second time unit transmits one TB, the value of K is 5 (1 symbol is used to transmit the PSFCH and 4 symbols are used as AGC); in a case where the second time unit transmits a plurality of TBs, the value of K1 is greater than 5 (a plurality of symbols is used to transmit the PSFCH and 4 symbols are used as AGC).

[00505] In some implementations, in a case where K1 is greater than 1, the number of symbols corresponding to Petition 870250078539, dated 03 / 09 / 2025, page 151 / 580 The first 144 / 241 PSFCH may be smaller than K1, and the K1 symbols are used to repeatedly transmit a plurality of the first PSFCHs. In other words, the K1 symbols can transmit a plurality of PSFCHs, and the side-link feedback information carried in the plurality of PSFCHs is the same as the side-link feedback information carried in the first PSFCH; that is, the plurality of PSFCHs is used to repeatedly transmit the side-link feedback information carried in the first PSFCH. By repeatedly transmitting the PSFCH in the time domain, the PSFCH detection performance can be improved.

[00506] In some implementations, different PSFCHs of the plurality of PSFCHs (including the first PSFCH) in the K1 symbols correspond to the same features in the frequency domain.

[00507] In some implementations, different PSFCHs of the plurality of PSFCHs (including the first PSFCH) in the K1 symbols correspond to different features in the frequency domain.

[00508] In some implementations, different PSFCHs of the plurality of PSFCHs (including the first PSFCH) in the K1 symbols correspond to the same code domain features.

[00509] In some implementations, different PSFCHs from the plurality of PSFCHs (including the first PSFCH) in the K1 symbols correspond to different code domain features.

[00510] In some implementations, in a case where K1 is greater than 1, the number of symbols corresponding to Petition 870250078539, dated 03 / 09 / 2025, p. 152 / 580 145 / 241 The first PSFCH is K1. In other words, the first PSFCH occupies K1 symbols (i.e., the number of symbols occupied by the first PSFCH in the time domain is greater than 1). For example, after channel encoding and modulation, the side-link feedback information corresponding to the first PSFCH can be mapped to transmission features corresponding to the K1 symbols.

[00511] In some implementations, the transmission resources corresponding to the K1 symbols are also used to transmit DMRS. The DMRS is a DMRS PSFCH.

[00512] It should be noted that Mode 4.3 can be arbitrarily combined with Mode 4.1 and / or Mode 4.2. For example, in a case where the first PSFCH includes 1-bit information, the first PSFCH can occupy a PRB or a plurality of PRBs in the frequency domain, and the first PSFCH can occupy a symbol or a plurality of symbols in the time domain. As another example, in a case where the first PSFCH includes information of a plurality of bits, the first PSFCH can occupy a PRB or a plurality of PRBs in the frequency domain, and the first PSFCH can occupy a symbol or a plurality of symbols in the frequency domain.

[00513] The content above describes the PSFCH format in detail in conjunction with Mode 4.1 to Mode 4.3. Several more specific examples of PSFCH formats are provided below. The PSFCH in the first time unit (e.g., the first PSFCH) may use any of a plurality of PSFCH formats provided below. MODE 1: A PSFCH 1 FORMAT

[00514] If PSFCH uses a PSFCH 1 format, the Petition 870250078539, dated 03 / 09 / 2025, page 153 / 580 146 / 241 PSFCH will carry 1-bit side-link feedback information. Furthermore, PSFCH is mapped to a symbol in the time domain and PSFCH occupies a PRB in the frequency domain.

[00515] The time-domain resources of the PSFCH corresponding to the PSFCH may include K symbols, and K=K1+K2. The K1 symbols of the K symbols (corresponding to the last K1 symbols of the K symbols) are used to transmit the PSFCH. The data transmitted in the K2 symbols (corresponding to the first K2 symbols of the K symbols) of the K symbols are repeated data of the data transmitted in the K1 symbols. The K2 symbols may be used by the receiving device to perform AGC adjustment.

[00516] The 1-bit side-link feedback information in PSFCH can be carried by a first sequence, and the length of the first sequence is 12.

[00517] If the time unit associated with the PSFCH transmits only one TB (for example, the time unit transmits only one PSSCH, or the time unit transmits a plurality of PSSCHs, and the plurality of PSSCHs corresponds to the same TB), the 1-bit side-link feedback information carried by the PSFCH is the side-link feedback information for the one TB.

[00518] If the time unit associated with the PSFCH transmits a plurality of TBs (for example, the time unit transmits a plurality of PSSCHs and the plurality of PSSCHs corresponds to different TBs), since the PSFCH can only carry link feedback information Petition 870250078539, dated 03 / 09 / 2025, p. 154 / 580 147 / 241 1-bit side link, any of the methods 1 to 3 described below can be used to perform side link feedback.

[00519] In method 1, the side-link feedback information corresponding to a plurality of TBs is grouped to perform feedback. For example, packing processing can be performed on a plurality of side-link feedback information corresponding to a plurality of TBs. Packing processing can be, for example, an AND operation of a plurality of bits, the result of the AND operation is 1 bit, and the result of the operation can be fed back through the PSFCH. For example, if the value of a bit is 1, it indicates ACK, and the value of a bit is 0, it indicates NACK, and the time unit associated with the PSFCH transmits 4 TBs which correspond, respectively, to the 4-bit side-link feedback information.In this case, only when all 4 bits of feedback information are ACK, that is, the values ​​of all 4 bits are 1, is the result of the AND operation 1; otherwise, the result of the AND operation is 0. By grouping side-link feedback information from a plurality of bits into 1 bit and feeding it back via PSFCH, the PSFCH 0 format feedback mechanism can be used to a greater extent.

[00520] In method 2, a plurality of side-link feedback information corresponding to a plurality of TBs are carried respectively by a plurality of PSFCHs. The entire plurality of PSFCHs uses the PSFCH format 1, the plurality of Petition 870250078539, dated 03 / 09 / 2025, pp. 155 / 580 148 / 241 PSFCHs are located on the same time-domain resources, and the plurality of PSFCHs corresponds to different frequency-domain resources or code-domain resources. In method 2, the side-link feedback information corresponding to different TBs is fed back through different PSFCHs, respectively, so that the PSFCH feedback format and the slot-based feedback mechanism can be reused as much as possible, and side-link feedback from a plurality of PSFCHs can be performed simultaneously.

[00521] For example, Figure 33 illustrates eight time units in a set of resources (i.e., time unit #0 to time unit #7 in Figure 33). One time unit includes 2 slots, and the PSFCH period is 2 time units. The PSFCH is located in time units #1, #3, #5, #7, etc. A time interval between the PSFCH and a PSSCH transmission resource associated with the PSFCH is 2, i.e., 2 time units. The PSFCH transmission resource includes 5 symbols, where 1 symbol (i.e., K1 equals 1) is used to transmit the PSFCH, and the remaining 4 symbols (i.e., K2 equals 4) are used as AGC. For simplicity, the AGC symbol located at the initial position of the time unit is not illustrated in Figure 33. Two PSSCHs are transmitted in time unit #2, namely PSSCH 1 and PSSCH 2. The PSFCH transmission resources corresponding to PSSCH 1 and PSSCH 2 are located in time unit #5.Furthermore, PSSCH 1 and PSSCH 2 correspond to PSFCH 1 and PSFCH 2, respectively; each PSFCH carries 1-bit side-link feedback information, and each PSFCH occupies one PRB in the frequency domain. As can be seen in... Petition 870250078539, dated 03 / 09 / 2025, p. 156 / 580 149 / 241 Figure 33, PSFCH 1 and PSFCH 2 correspond to the same resources in the time domain, but PSFCH 1 and PSFCH 2 correspond to different resources in the frequency domain.

[00522] In method 3, a plurality of side-link feedback information corresponding to a plurality of TBs is carried respectively by a plurality of PSFCHs, and all of a plurality of PSFCHs use the PSFCH 1 format. The plurality of PSFCHs is located on different time-domain resources, and the plurality of PSFCHs corresponds to the same frequency-domain resources or code-domain resources, or the plurality of PSFCHs corresponds to different frequency-domain resources or code-domain resources. Method 3 feeds back the side-link feedback information corresponding to different TBs through different PSFCHs, respectively, which can reuse the PSFCH feedback format and the slot-based feedback mechanism as much as possible and perform side-link feedback of a plurality of PSFCHs at the same time.

[00523] For example, Figure 34 illustrates eight time units in a set of features (i.e., a time unit #0 to a time unit #7 in Figure 34). A time unit includes 2 slots, and a PSFCH period is 2 time units. The PSFCH is located in time units #1, #3, #5, #7, etc. A time interval (minimum time interval) between the PSFCH transmission resources and the PSSCH corresponding to the PSFCH is 2, that is, 2 time units. The PSFCH transmission resource includes 6 Petition 870250078539, dated 03 / 09 / 2025, page 157 / 580 150 / 241 (i.e., K equals 6) symbols, of which 2 symbols are used to transmit the PSFCH (i.e., K1 equals 2, corresponding to the last two symbols of the 6 symbols). The PSFCH transmitted in each of the two symbols corresponds to a PSSCH in a time unit, and the remaining four symbols are used as AGC (i.e., K2 equals 4, corresponding to the first 4 symbols of the six symbols). For simplicity, the AGC symbol located at the initial position of the time unit is not illustrated in Figure 34. In Figure 34, two PSSCHs (including PSSCH 1 and PSSCH 2) are transmitted in time unit #2, and the PSFCH transmission features corresponding to the two PSSCHs are located in time unit #5. Furthermore, PSSCH 1 in time unit #1 corresponds to PSFCH 1, and PSSCH 2 in time unit #2 corresponds to PSFCH 2.PSFCH 1 is located at the second-to-last symbol corresponding to the PSFCH transmission feature in time unit #5, i.e., the first symbol used for PSFCH transmission (not including the first 4 symbols used as AGC), and PSFCH 2 is located at the last symbol of the PSFCH transmission feature in time unit #5, i.e., the second symbol used for PSFCH transmission (not including the first 4 symbols used as AGC). As can be seen in Figure 34, the frequency domain features of PSFCH 1 and the frequency domain features of PSFCH 2 are different.

[00524] It should be noted that methods 2 and 3 can be used in combination to transmit a plurality of PSFCHs, each PSFCH carrying 1-bit side-link feedback information. For example, J-bit side-link feedback information. Petition 870250078539, dated 03 / 09 / 2025, pages 158 / 580 151 / 241 corresponding to the plurality of TBs are carried by J PSFCHs, and each PSFCH carries 1-bit side-link feedback information. Ι = Σί=1ι / ί , where Ji represents the number of PSFCHs transmitted in the i-th symbol and Ji is an integer greater than or equal to 0. That is, the J PSFCHs are transmitted via K1 symbols, and 0, 1 or more PSFCHs can be transmitted in each symbol; the number of PSFCHs transmitted in each symbol can be equal or different. EXAMPLE 2: A PSFCH 2 FORMAT

[00525] If the PSFCH uses the PSFCH 2 format, the PSFCH will carry 1-bit side-link feedback information. A PSFCH is mapped to a symbol in the time domain, and a PSFCH occupies Q PRBs in the frequency domain, where Q is a positive integer greater than or equal to 1. In a case where Q equals 1, the PSFCH 2 format is equivalent to the PSFCH 1 format. In a case where Q is greater than 1, it is equivalent to transmitting a PSFCH via a plurality of PRBs. In a case where there is a power spectrum density (PSD) limitation, the transmission power of the side-link feedback information can be increased by transmitting a plurality of PRBs, thus improving detection performance.

[00526] The PSFCH time-domain resources corresponding to PSFCH may include K symbols, and K=K1+K2. The K1 symbols of the K symbols (corresponding to the last K1 symbols of the K symbols) are used to transmit the PSFCH. The data transmitted in K2 symbols of the K symbols (corresponding to the first K2 symbols of the K symbols) are repeated data from the data transmitted in K1 symbols. K2 symbols can be used by the receiving device. Petition 870250078539, dated 03 / 09 / 2025, p. 159 / 580 152 / 241 to perform the AGC adjustment.

[00527] Optionally, 1-bit side link feedback information can be carried by a first sequence, and the length of the first sequence is 12. The first sequence is mapped to a PRB. In a case where Q is greater than 1, the data transmitted in the remaining PRBs of the Q PRBs can be determined based on the first sequence.

[00528] Optionally, 1-bit side-link feedback information can be carried by a second sequence. The length of the second sequence is Q-Nj^fea, where the second sequence is mapped to all subcarriers corresponding to Q PRBs, where Nçc represents the number of subcarriers included in a PRB.

[00529] For the PSFCH 2 format, side-link feedback information can be transported in a manner similar to method 1, method 2, or method 3 mentioned in the PSFCH 1 format.

[00530] For example, for method 1, the side-link feedback information of a plurality of bits can be grouped to perform side-link feedback. For example, an AND operation can be performed on a plurality of bits bit by bit to generate 1-bit side-link feedback information, and the side-link feedback information can be carried by the PSFCH 2 format.

[00531] For another example, for method 2, the respective side-link feedback information corresponding to each TB in a plurality of TBs can be Petition 870250078539, dated 03 / 09 / 2025, page 160 / 580 153 / 241 transported by a Format 2 PSFCH, and the side-link feedback information corresponding to the plurality of TBs corresponds to a plurality of Format 2 PSFCHs, respectively. The time-domain features of the plurality of Format 2 PSFCHs are the same, and the plurality of Format 2 PSFCHs corresponds to different frequency-domain and / or code-domain features.

[00532] As another example, for method 3, each bit of the side-link feedback information of a plurality of bits corresponds to a respective PSFCH of form 2 in one of the K1 symbols, and different side-link feedback information is carried by a PSFCH of form 2 in different symbols of the K1 symbols. EXAMPLE 3: A PSFC 3 FORMAT

[00533] If the PSFCH uses the PSFCH 3 format, the PSFCH will carry Y bits of side-link feedback information. Furthermore, a PSFCH is mapped to a symbol in the time domain and occupies Z PRBs in the frequency domain. Y can be a positive integer greater than or equal to 1. Z can be a positive integer greater than or equal to 1. In a case where Y equals 1, Z equals 1, the PSFCH 3 format is equivalent to the PSFCH 1 format; in a case where Y equals 1, Z equals Q, the PSFCH 3 format is equivalent to the PSFCH 2 format. In a case where Y is greater than 1, a PSFCH can be used to carry side-link feedback information corresponding to a plurality of TBs transmitted in a unit of time, thus reducing the number of feedback channels. Petition 870250078539, dated 03 / 09 / 2025, p. 161 / 580 154 / 241 required for side link communication.

[00534] The PSFCH time-domain resources corresponding to the PSFCH may include K symbols, and K is equal to K1+K2. The K1 symbols of the K symbols (corresponding to the last K1 symbols of the K symbols) are used to transmit the PSFCH. The data transmitted in the K2 symbols of the K symbols (corresponding to the first K2 symbols of the K symbols) are repeated data from the data transmitted in the K1 symbols. The K2 symbols may be used by the receiving device to perform AGC adjustment.

[00535] Optionally, Y-bit side-link feedback information can be carried by a first sequence. The duration of the first sequence is 12. The first sequence is mapped to a PRB of Z PRBs, and the data transmitted in the remaining PRBs of the Z PRBs is determined based on the first sequence.

[00536] Optionally, the Y-bit side-link feedback information can be carried by a second sequence. The length of the second sequence is Z·NC. The second sequence is mapped to all subcarriers corresponding to Z PRBs, where Nc represents the number of subcarriers included in a PRB.

[00537] If the time unit associated with the PSFCH is used to transmit a plurality of TBs, the PSFCH 3 format is used and the side-link feedback information of a plurality of bits corresponding to a plurality of TBs in a time unit can be carried by a PSFCH. This feedback method is different from method 1, method 2, and method 3. Petition 870250078539, dated 03 / 09 / 2025, page 162 / 580 155 / 241

[00538] For example, Figure 35 illustrates eight time units in a set of features (i.e., a time unit #0 to a time unit #7 in Figure 35). A time unit includes 2 slots, and a PSFCH period is 2 time units. The PSFCH is located in time units #1, #3, #5, #7, etc. A time interval (minimum time interval) between the PSFCH transmission resources and the corresponding PSFCH PSSCH is 2, i.e., 2 time units. The PSFCH transmission resource includes 5 symbols, where one symbol is used to transmit the PSFCH (i.e., K1 equals 1, corresponding to the last symbol of the 5 symbols included in the PSFCH transmission resource), and the remaining 4 symbols are used as AGC (i.e., K2 equals 4, corresponding to the first 4 symbols of the 5 symbols included in the PSFCH transmission resource). For simplicity, the AGC symbol located at the beginning of the time unit is not shown in Figure 35. The PSFCH in Figure 35 occupies 2 PRBs in the frequency domain, and the PSFCH carries 2-bit side-link feedback information.Two PSSCHs are transmitted in time unit #2, namely PSSCH 1 and PSSCH 2. The PSFCH transmission resources corresponding to PSSCH 1 and PSSCH 2 are located in time unit #5, and the side-link feedback information (2 bits in total) from PSSCH 1 and PSSCH 2 is carried by a PSFCH in time unit #5. EXAMPLE 4: A PSFC 4 FORMAT

[00539] The PSFCH 4 format is an extension of the PSFCH 3 format. For PSFCH using a format 4, the time-domain features corresponding to PSFCH include K symbols, where the K1 symbols (corresponding to the last symbols) Petition 870250078539, dated 03 / 09 / 2025, p. 163 / 580 156 / 241 K1 symbols (of the K symbols) are used to transmit side-link feedback information, and K2 symbols (corresponding to the first K2 symbols of the K symbols) are used as AGC. The time-domain feature of the PSFCH that carries the side-link feedback information is a symbol. The PSFCH is mapped to one symbol of the K1 symbols (e.g., the first symbol of the K1 symbols), and the PSFCH is repeatedly transmitted on the remaining symbols (K1-1). Repeated transmission of the PSFCH in the time domain can improve the PSFCH detection performance.

[00540] Optionally, the PSFCHs in the K1 symbols correspond to the same or different features in the frequency domain.

[00541] The PSFCH in each of the K1 symbols can be a PSFCH based on the PSFCH 3 format. That is, in each symbol, a PSFCH occupies Z PRBs in the frequency domain, and a PSFCH carries Y bits of information. In a case where K1 equals 1, the PSFCH 4 format is equivalent to the PSFCH 3 format.

[00542] For example, Figure 36 illustrates eight time units in a set of features (i.e., a time unit #0 to a time unit #7 in Figure 36). A time unit includes 2 slots, and a PSFCH period is 2 time units. The PSFCH is located in time units #1, #3, #5, #7, etc. The time interval between the PSFCH transmission resources and the PSSCH corresponding to the PSFCH is 2, i.e., 2 time units. The PSFCH transmission resource includes 6 symbols, of which 2 symbols (i.e., K1 equals 2, corresponding to the last symbols) K1 of the K symbols) are used to transmit the PSFCH, and the 4 Petition 870250078539, dated 03 / 09 / 2025, p. 164 / 580 The remaining 157 / 241 symbols (i.e., K2 equals 4, corresponding to the first K2 symbols of the K symbols) are used as AGC. For simplicity, the AGC symbol located at the initial position of a time unit is not illustrated in Figure 36. In the example in Figure 36, each PSFCH occupies 2 PRBs in the frequency domain, i.e., Z equals 2; and each PSFCH carries 2 bits of side-link feedback information, i.e., Y equals 2. Two PSSCHs are transmitted in time unit #2, i.e., PSSCH 1 and PSSCH 2. The PSFCH transmission resources corresponding to PSSCH 1 and PSSCH 2 are located in time unit #5, and the side-link feedback information (2 bits in total) of PSSCH 1 and PSSCH 2 is carried by one PSFCH. The PSFCH occupies 2 PRBs in the frequency domain. PSFCH is mapped to the first symbol of the PSFCH K1 symbols, that is, the fifth symbol of the six symbols corresponding to the PSFCH transmission resource.PSFCH is repeatedly mapped to the second symbol of the PSFCH K1 symbols (i.e., the sixth symbol of the six symbols corresponding to the PSFCH transmission feature). The PSFCH at the sixth symbol and the PSFCH at the fifth symbol may correspond to different features in the frequency domain. EXAMPLE 5: A PSFC 5 FORMAT

[00543] If the PSFCH uses the PSFCH 5 format, the time-domain features of a PSFCH will include K symbols, and K=K1+K2. K1 symbols (corresponding to the last K1 symbols of the K symbols) are used to transmit K1 side-link feedback information, and K2 symbols (corresponding to the first K2 symbols of the K symbols) are used as AGC. Petition 870250078539, dated 03 / 09 / 2025, page 165 / 580 158 / 241

[00544] The PSFCH time-domain feature that carries the side-link feedback information is K1 symbols. Optionally, the PSFCH matches the same or different frequency-domain and / or code-domain features in K1 symbols. The frequency-domain PSFCH occupies Z PRBs, and a PSFCH carries Y bits of information.

[00545] Optionally, Y-bit side-link feedback information can be carried by a sequence.

[00546] For example, a sequence length is Z · N™ · K1 . N / cb indicates the number of subcarriers included in a PRB; a sequence of each length Z· N™ is mapped to Z PRBs of a symbol of symbols K1.

[00547] As another example, a sequence length is Z · N^RB. N^ indicates the number of subcarriers included in a PRB; the sequence can be repeatedly mapped to each of the K1 symbols (in this case, the PSFCH 5 format is equivalent to the PSFCH 4 format).

[00548] Optionally, the feedback information of the Y bits is encoded and modulated per channel and mapped to transmission resources corresponding to the K1 symbols, and the transmission resources corresponding to the K1 symbols may also include PSFCH DMRS transmission resources. MODE 5: A METHOD OF DETERMINING THE FIRST PSFCH TRANSMISSION RESOURCE AND CONFIGURATION INFORMATION OF A FIRST PSFCH

[00549] The first PSFCH transmission resource can be determined based on one or more of the first Petition 870250078539, dated 03 / 09 / 2025, page 166 / 580 159 / 241 information up to the seventh piece of information described below.

[00550] In some implementations, the first information is used to indicate an index of a time unit to which a first PSSCH corresponds (associated with a first PSFCH). For example, the first information indicates that an interval of the time unit index of the first PSSCH is [0, F1-1], and F1 is determined based on the period of the PSFCH.

[00551] In some implementations, the second piece of information can be used to indicate slot information for the first PSSCH. The slot information for the first PSSCH can be, for example, an index of a slot in which the first PSSCH is located. Optionally, a range of the slot index indicated by the second piece of information is determined based on the number of slots included in a time unit. For example, the range of the slot index for the first PSSCH is [0, F2-1], and F2 can be determined based on the number of slots included in a time unit.

[00552] In some implementations, third information can be used to indicate time-domain resource information where the first PSFCH is located. Optionally, the time-domain resource information can include, for example, a symbol where the first PSFCH is located. For example, the time-domain resource information can be represented as an index of the symbol where the first PSFCH is located. The index can correspond to the symbol index of the first PSFCH within a slot (an index range is [0, N / ^οίο— 1]), or the index can correspond to the index of the K symbols included in the transmission resources. Petition 870250078539, dated 03 / 09 / 2025, page 167 / 580 160 / 241 of the first PSFCH (an index range is [0, K—1]), or the index may correspond to the index of the K1 symbols used for PSFCH transmission included in the PSFCH transmission resources (an index range is [0, K1—1]). The aforementioned ^sSímÍoZo represents the number of symbols included in a slot, K represents the number of symbols included in the PSFCH transmission resource, K1 represents the number of symbols used to transmit the PSFCH from the K symbols included in the PSFCH transmission resource, K=K1+K2, where the K2 symbols may be used as AGC.

[00553] For example, in Figure 34, the PSFCH is transmitted in the fifth symbol and the sixth symbol corresponding to the PSFCH transmission feature in time unit #5, i.e., PSFCH 1 and PSFCH 2 in Figure 34. The first PSFCH can be either PSFCH 1 or PSFCH 2. The transmission features corresponding to the first PSFCH can be determined based on the symbol index in the K1 symbols (i.e., corresponding to an index 0 and an index 1 in the K1 symbols, where K1=2).

[00554] In some implementations, the fourth piece of information can be used to indicate an initial position in the frequency domain of the PSSCH in the first unit of time.

[00555] In some implementations, the fifth piece of information can be used to indicate a length of the features in the frequency domain of the PSSCH in the first unit of time.

[00556] In some implementations, the sixth piece of information can be used to indicate the number of reusable cyclic shift pairs in a PRB; where the Petition 870250078539, dated 03 / 09 / 2025, page 168 / 580 161 / 241 cyclic shift pairs are used for transmission of the first PSFCH. The number of cyclic shift pairs indicated by the sixth piece of information, for example, can be determined based on an upper-layer parameter slNumMuxCS-Pair.

[00557] In some implementations, the seventh piece of information can be used to indicate the identity of a terminal device. The terminal device identity may include a source identity (e.g., registered as Pid). The source identity can be determined based on the source ID information field in the SCIs associated with the PSSCH. The terminal device identity may include a first identity (registered as Mid). In a case where a conversion type indication information value (conversion type indicator) indicated in the SCIs associated with the PSSCH is 01, the first identity can be determined based on a member ID of the receiving device; otherwise, the first identity is 0.

[00558] One or more parameters in the configuration information of the first PSFCH are in slot units. In a time-based structure, these parameters can be updated to be in time-unit units. Such parameters associated with the first PSFCH are described in detail below.

[00559] In some implementations, the first PSFCH is associated with a first parameter. The first parameter is used to indicate the period of the first PSFCH and, therefore, the first parameter can also be referred to as a period parameter of the first PSFCH. The first Petition 870250078539, dated 03 / 09 / 2025, page 169 / 580 162 / 241 parameter can be, for example, sl-PSFCH-Period. In embodiments of the present disclosure, the first parameter can be represented based on the number of time units.

[00560] In some implementations, the first PSFCH is associated with a second parameter. The second parameter is used to indicate a minimum time interval between the first PSFCH and the first PSSCH (a PSSCH associated with the first PSFCH). The second parameter can be, for example, sl-MinTimeGapPSFCH. In embodiments of the present disclosure, the second parameter is represented based on the number of time units. For example, the first PSSCH is located in a time unit n, the first PSFCH is the first available PSFCH later than a time unit n+k, or a position in the time domain corresponding to the first PSFCH is not earlier than a position in the time domain of the first available PSFCH in time unit n+k, where n is an integer and k is determined based on the second parameter.

[00561] In some implementations, the time unit of the PSSCH is determined based on a minimum time interval and a first moment. The first moment can be determined based on one of the following ways: start time of a time unit n; end time of time unit n; start time of the first symbol used to transmit the first PSSCH; end time of the last symbol used to transmit the first PSSCH; start time of a slot in which the first PSSCH is located; and end time of a slot in which the first PSSCH is located.

[00562] For example, Figure 37 illustrates 8 Petition 870250078539, dated 03 / 09 / 2025, page 170 / 580 163 / 241 time units in a resource set (i.e., time unit #0 to time unit #7). The 8 time units can be any 8 time units in the resource set. As can be seen in Figure 37, a time unit can include 2 slots, and a PSFCH period is 2 time units, i.e., one time unit in every 2 time units includes a PSFCH transmission resource, and PSFCH is located in time unit #1, time unit #3, time unit #5, time unit #7, etc. Furthermore, in the example in Figure 37, a time interval (minimum time interval) between the transmission resources of the PSFCH and the PSSCH corresponding to the PSFCH (i.e., the side-link feedback information transmitted by the PSFCH is feedback information for the PSSCH) is 2, i.e., 2 time units.As illustrated in Figure 37, for PSSCH transmitted in time unit #1, a PSFCH transmission resource corresponding to PSSCH is located in the first available PSFCH transmission resource after time unit #3, that is, the . PSFCH located in time unit #5. MODE 6: A DMRS STANDARD BASED ON A UNIT OF TIME

[00563] It can be seen in Mode 2 that a plurality of slots are included in a time unit available to transmit one or more PSSCHs. The number of symbols corresponding to the transmission feature of a PSSCH can be determined based on one or more of the following factors: the number of slots included in a time unit (i.e., the value M); the number of symbols used as GP in a time unit (i.e., the value B); the Petition 870250078539, dated 03 / 09 / 2025, page 171 / 580 164 / 241 number of symbols used as AGC in a time unit (i.e., the A value, which can be determined, for example, based on the symbol interval between the position of the first symbol available for side link transmission in a time unit or slot and the position of the first symbol used for PSSCH transmission in a time unit); whether a time unit includes PSSCH transmission capabilities; and the number of slots corresponding to the transmission capability of a PSSCH.

[00564] It can be seen in the illustration of the time-unit slot structure that the number of symbols corresponding to the PSSCH in a time-unit varies greatly, ranging from a few symbols to tens of symbols. For example, the number of symbols corresponding to the PSSCH in an n+6 slot in Figure 30 is 3. The number of symbols corresponding to a PSSCH in Figure 19A is 48. Furthermore, the transmission capability of a PSSCH in a time-unit can occupy a plurality of slots. Therefore, the DMRS standard based on a single-slot structure in the related technique is not suitable for time-unit-based side-link transmission. This incompatibility can be reflected in the following aspects:

[00565] First, the single-slot-based PSSCH DMRS standard is not suitable for multi-slot PSSCH transmission;

[00566] Secondly, in a case where a PSSCH transmission resource can span a plurality of slots, it is unclear how to determine the PSSCH DMRS standard;

[00567] Third, the PSSCH DMRS standard based on the single-slot structure defines only the case in Petition 870250078539, dated 03 / 09 / 2025, p. 172 / 580 165 / 241 that the number of symbols corresponding to PSSCH is a maximum of 13 symbols (see Table 1) and does not support the case where the number of PSSCH symbols exceeds 13;

[00568] Fourth, the PSSCH DMRS standard based on the single-slot structure only defines the case where the number of symbols corresponding to the PSSCH is greater than or equal to 6 symbols, and does not support the case where the number of PSSCH symbols is less than 6; and

[00569] Fifth, for time-based PSSCH transmission, how to indicate the DMRS standard of PSSCH via SCI is also a problem that needs to be solved.

[00570] In addition to the problems above, how to transmit the PSCCH DMRS in the first unit of time is also a problem that needs to be considered.

[00571] In response to one or more of the above problems, the embodiments of the present disclosure propose a DMRS standard based on a unit of time. The present embodiment is described in detail below.

[00572] With reference to Figure 38, the embodiments of the present disclosure provide a method for side-link transmission. The method includes the S3810 step, namely, a first terminal device determines a DMRS pattern for a first transmitted channel in a first time unit.

[00573] A detailed description of the first unit of time may refer to Mode 1, which will not be described in detail here.

[00574] The first channel may include a first PSSCH or a first PSCCH. A detailed description of the first PSSCH may refer to content related to Petition 870250078539, dated 03 / 09 / 2025, p. 173 / 580 166 / 241 PSSCH above, such as the PSSCH transmission feature design method in the first time unit (see Mode 1), the PSSCH transmission method (see Mode 2), and the method for determining the TBS corresponding to PSSCH (see Mode 3). A detailed introduction to the first PSCCH can be found in the content related to PSCCH above, such as the PSCCH transmission feature in the first time unit (see Mode 1) and the content of the first SCI stage (see Mode 1 and Mode 2).

[00575] The following uses the first channel being the first PSSCH and the first PSCCH as examples to illustrate in detail the way of determining the DMRS pattern of the first channel. MODALITY 6.1: A DMRS STANDARD FOR A FIRST PSSCH

[00576] There may be a plurality of ways to determine the DMRS pattern (or DMRS pattern in the time domain) for the first PSSCH. For example, the DMRS pattern for the first PSSCH can be determined by setting a starting position of the DMRS PSSCH symbol in the first time unit and an interval between adjacent DMRS PSSCH symbols. As another example, the DMRS pattern for the first PSSCH can be determined by extending a DMRS pattern based on a single slot. As yet another example, the DMRS pattern for the first PSSCH can be determined by the way of specifically defining or configuring the DMRS pattern based on the time unit. The method of determining the DMRS pattern for the first PSSCH will be described in detail below in conjunction with modalities 6.1.1 to 6.1.2. Petition 870250078539, dated 03 / 09 / 2025, page 174 / 580 167 / 241

[00577] In some implementations, the last DMRS PSSCH symbol of the first PSSCH determined based on the DMRS standard for the first PSSCH is a first target symbol. The time-domain resources for transmitting the first PSSCH later than the first target symbol occupy P symbols. If the P symbols meet a first condition, at least one of the P symbols (e.g., the last symbol of the P symbols) is used to map a DMRS. The first condition may include one or more of the following: the number of symbols of the P symbols being greater than or equal to a first limit value (it should be understood that the first limit value mentioned in this embodiment is a different limit value from the first limit value mentioned in embodiment 2); and a ratio between the number of symbols of the P symbols and a symbol interval (or time interval) between two adjacent DMRS PSSCH symbols of the first PSSCH being greater than or equal to a second limit value.In a case where there are a large number of PSSCH symbols following the last DMRS symbol, the channel estimation performance will be affected. Therefore, using the last PSSCH symbol as a DMRS symbol can improve both the channel estimation performance and the PSSCH detection performance. The first threshold value can be 3. The second threshold value can be 0.5. A detailed description can be found in the relevant content of Figure 40 and Figure 47B below.

[00578] In some implementations, the DMRS of the first PSSCH occupies a first PRB in the frequency domain, and all H1 subcarriers in the first PRB are used to map the DMRS, where H1 is a positive integer greater than or equal to 1. H1 can be, for example, equal to Petition 870250078539, dated 03 / 09 / 2025, p. 175 / 580 168 / 241 to 1 or 2. If H1 equals 1, it means that all subcarriers corresponding to the first PSSCH carry DMRS. If H1 equals 2, it means that the spacing of the adjacent DMRS subcarrier on the subcarrier corresponding to the first PSSCH is 2. For example, DMRS can be mapped to an even-numbered subcarrier, or DMRS can be mapped to an odd-numbered subcarrier. MODE 6.1.1: A DMRS STANDARD FOR AN INITIAL PSSCH IS DETERMINED BASED ON INITIAL INFORMATION

[00579] In some implementations, the first information may be configuration information.

[00580] In some implementations, the first information includes one or more of the following: information used to determine a position in the time domain of the first PSSCH DMRS symbol (hereinafter referred to as second information); and information used to determine a symbol interval between two adjacent PSSCH DMRS symbols (hereinafter referred to as third information). The position in the time domain of the first PSSCH DMRS symbol can be determined based on the second information, and the symbol interval between two adjacent PSSCH DMRS symbols can be determined based on the third information. Therefore, all symbol positions corresponding to the DMRS symbol of the first PSSCH can be determined based on both the second and third information.

[00581] In this mode, a position of the first DMRS symbol of the PSSCH and an interval between adjacent DMRS symbols are configured using the initial information. This configuration method may be applicable Petition 870250078539, dated 03 / 09 / 2025, page 176 / 580 169 / 241 to the case where the number of PSSCH symbols is arbitrarily large and therefore can be well applied to the scenario where PSSCH transmission resources span a plurality of slots.

[00582] In some implementations, the second piece of information is used to indicate a position in the time domain or symbol index of the first PSSCH DMRS symbol in a slot.

[00583] In some implementations, the second piece of information is used to indicate a position in the time domain or symbol index of the first PSSCH DMRS symbol in a unit of time.

[00584] In some implementations, the second piece of information is used to indicate a time-domain offset of the first PSSCH DMRS symbol relative to the first symbol corresponding to a PSSCH transmission resource. The first symbol corresponding to the PSSCH transmission resource is the first symbol used to transmit the PSSCH. Alternatively, the first symbol corresponding to the PSSCH transmission resource may be the first symbol after the symbol used as AGC. Alternatively, the first symbol corresponding to the PSSCH transmission resource may be the first symbol mapped by the PSSCH. Alternatively, the first symbol corresponding to the PSSCH transmission resource may be the first symbol of the PSSCH resource assignment in a time unit. The time-domain offset mentioned in this implementation, for example, may be represented by the number of symbols.

[00585] In some implementations, the second Petition 870250078539, dated 03 / 09 / 2025, page 177 / 580 The 170 / 241 information is used to indicate a time-domain offset of the first PSSCH DMRS symbol relative to the first symbol in a slot. The time-domain offset mentioned in this implementation, for example, can be represented by the number of symbols.

[00586] In some implementations, the second piece of information is used to indicate a time-domain offset of the first PSSCH DMRS symbol relative to the first symbol by one unit of time. The time-domain offset mentioned in this implementation, for example, can be represented by the number of symbols.

[00587] In some implementations, the second piece of information is used to indicate a time-domain offset of the first PSSCH DMRS symbol relative to the first symbol corresponding to a PSCCH transmission resource. The time-domain offset mentioned in this implementation, for example, can be represented by the number of symbols.

[00588] In some implementations, the second piece of information is used to indicate a time-domain offset of the first PSSCH DMRS symbol relative to the last symbol corresponding to a PSCCH transmission resource. The time-domain offset mentioned in this implementation, for example, can be represented by the number of symbols.

[00589] In some implementations, the second piece of information may simultaneously indicate a plurality of types of the information above.

[00590] For example, the first PSSCH DMRS symbol determined based on the second piece of information is Petition 870250078539, dated 03 / 09 / 2025, page 178 / 580 171 / 241 located in the first symbol used to transmit the PSSCH.

[00591] As another example, the first PSSCH DMRS symbol determined based on the second piece of information is located in the next symbol of the PSCCH time domain resource, that is, located in the next symbol of the last time domain symbol corresponding to the PSCCH transmission resource.

[00592] In some implementations, the symbol interval between two adjacent PSSCH DMRS symbols indicated by third information has one or more values, and one or more values ​​include a first value, and the first value indicates that the symbol interval between two adjacent PSSCH DMRS symbols is greater than 14 (i.e., the number of symbols included in a slot in normal CP).

[00593] For example, the value of the third piece of information includes, but is not limited to, 12, 20, 24, 28, 40, 56, etc. Alternatively, the value of the third piece of information may also include 4, 8, 16, etc. The first value may be, for example, one of 20, 24, 28, 40, and 56.

[00594] In some implementations, the initial information is determined based on one or more of the following: side-link BWP configuration information, feature set configuration information, PC5-RRC configuration information, predefined information in a protocol, pre-configured information, and network device configuration information.

[00595] For example, the feature set configuration information includes second-party information and third-party information. The transmitting device or the receiving device can determine the Petition 870250078539, dated 03 / 09 / 2025, page 179 / 580 172 / 241 DMRS standard for the first PSSCH based on the second and third information.

[00596] As another example, the second information and the third information can be the same configuration information or different configuration information. For example, the feature set configuration information includes the third information, and the PC5-RRC or SCI includes the second information.

[00597] In some implementations, initial information can be determined based on indication information from the terminal device. The terminal device can be a side-link data transmission device or a side-link data receiver device. The indication information can be carried via SCI, MAC CE, or PC5-RRC signaling.

[00598] In some implementations, the initial information is used to configure one or more candidate DMRS patterns of a PSSCH, and the DMRS pattern for the first PSSCH is a target DMRS pattern in one or more candidate DMRS patterns.

[00599] In addition, in some implementations, the SCIs transmitted in the first time unit (i.e., the SCIs associated with the first PSSCH) indicate a target DMRS PSSCH pattern. For example, the feature set configuration information includes the second and third pieces of information, which are used to configure one or more candidate DMRS patterns of the PSSCH. The transmitting device can determine the corresponding target DMRS pattern in a case where it transmits the first PSSCH and indicates the target DMRS pattern through the SCIs. The receiving device can determine the Petition 870250078539, dated 03 / 09 / 2025, pages 180 / 580 173 / 241 DMRS target standard according to SCI.

[00600] In some implementations, the DMRS pattern for the first PSSCH is determined based on the fourth piece of information, and the fourth piece of information is used to indicate a match between the first piece of information (which may also be the second piece of information and / or the third piece of information) and a first index. The match can be configured based on configuration information. Configuration information may include one or more of the following: side-link BWP configuration information, feature set configuration information, PC5-RRC configuration information, predefined information in a protocol, pre-configured information, and network device configuration information.

[00601] The correspondence may be, for example, the correspondence illustrated in Table 7. TABLE 7 Index corresponding to the DMRS standard. Second information (e.g., a time-domain offset of the first DMRS PSSCH symbol relative to the first symbol used to transmit the PSSCH). Third information (e.g., a symbol interval between two adjacent DMRS PSSCH symbols). 0 0 4 1 0 8 2 0 12 3 0 16 4 2 4 5 2 8 6 2 12 Petition 870250078539, dated 03 / 09 / 2025, page 181 / 580 174 / 241 7 2 16 8 4 4 9 4 8 10 4 12 11 4 16 12 6 4 13 6 8 14 6 12 15 6 16

[00602] Furthermore, in some implementations, the SCIs transmitted in the first time unit indicate the first index. That is, in the case where a transmitting device transmits the first PSSCH, it can first determine the DMRS pattern based on the match and indicate the DMRS pattern (e.g., the index corresponding to the DMRS pattern) to the receiving device via the SCIs.

[00603] In some implementations, if the first time unit is used to transmit a PSSCH (see Mode 2.1 above), the transmission features of a PSSCH may correspond to all symbols available for PSSCH transmission in the first time unit. In this case, DMRSs can be sequentially mapped to all symbols used to transmit the PSSCH in the first time unit based on the first piece of information. For example, a position in the time domain of the first PSSCH DMRS symbol can be determined based on the second piece of information, and a symbol interval between two adjacent DMRS symbols can be determined based on the third piece of information. Then, the DMRS PSSCH can be sequentially mapped to the Petition 870250078539, dated 03 / 09 / 2025, page 182 / 580 175 / 241 symbols corresponding to the PSSCH transmission resources of the first time unit.

[00604] For example, Figure 39 illustrates two time units, namely, a time unit #1 and a time unit #2. The first time unit can be either time unit #1 or time unit #2. In the example of Figure 39 shows a time unit containing 2 slots. Time unit #1 does not include PSFCH transmission resources, and time unit #2 includes PSFCH transmission resources. The allocation of PSSCH resources in a time unit begins from the fifth symbol, i.e., A equals 4. The first 4 symbols of a time unit can be used as AGC, and the last 4 symbols of a time unit are used as GP, i.e., B equals 4. The PSFCH time domain resource includes 5 symbols, where the data transmitted by the first 4 symbols is the same as the data transmitted in the fifth symbol, and therefore the first 4 symbols can be used as AGC, and the fifth symbol is used to transmit the PSFCH. A time unit includes one PSCCH and one PSSCH. The PSSCH transmits one TB. The PSSCH is mapped to two slots included in a time unit, and the PSCCH corresponding to the PSSCH occupies 3 symbols.Based on initial information, it is determined that the first DMRS PSSCH symbol is located in the first symbol following the last PSCCH symbol, and there are 8 symbols between two adjacent DMRS symbols. Therefore, the DMRS PSSCH can be sequentially mapped onto the symbols corresponding to the PSSCH transmission features in a unit of time, thus obtaining the DMRS pattern illustrated in Figure 39. Petition 870250078539, dated 03 / 09 / 2025, page 183 / 580 176 / 241

[00605] Optionally, in some embodiments, the DMRS pattern can be determined based on the second information and the third information. If the number of symbols used to transmit the PSSCH later than the last DMRS PSSCH symbol determined based on the DMRS pattern is P, and the number of symbols P is greater than or equal to a first limit value; or, a ratio between the number of symbols P and a symbol interval between two adjacent DMRS symbols is greater than or equal to a second limit value, the last symbol corresponding to the PSSCH transmission feature is also used to map the DMRS. For example, in Figure 39, there are 7 symbols to transmit the PSSCH later than the last DMRS symbol in time unit #2 (i.e., P equals 7). A ratio of the 7 symbols to the symbol interval between adjacent DMRS symbols (i.e., 8 symbols indicated by the third information) is 0.875.If the second threshold value is 0.5, the last symbol of the PSSCH transmission feature is also used to map the DMRS, as illustrated in Figure 40.

[00606] For example, Figure 41 illustrates two time units, namely a time unit #1 and a time unit #2. The first time unit can be either time unit #1 or time unit #2. In the example in Figure 41, a time unit includes 4 slots, time unit #1 does not include PSFCH transmission resources, and time unit #2 includes PSFCH transmission resources. The allocation of PSFCH resources in a time unit starts from the ninth symbol, i.e., A equals 8. The first 8 symbols in a time unit can be used as AGC, and the last 8 symbols in a time unit are Petition 870250078539, dated 03 / 09 / 2025, page 184 / 580 177 / 241 are used as GP, meaning B equals 8. The PSFCH in time unit #2 occupies 9 symbols, of which 8 symbols are used as AGC and 1 symbol is used to carry the PSFCH. In each time unit, except for the symbols used as AGC, GP, and PSFCH, the remaining symbols are all symbols used to transmit the PSSCH, and each time unit is used only to transmit one PSSCH, and the respective PSSCH corresponding to each time unit occupies 3 symbols. In the example in Figure 41, it is determined that the first DMRS PSSCH symbol is located on the first symbol used to transmit the PSSCH based on the second information, and the interval between adjacent DMRS PSSCH symbols is 8 symbols. Therefore, the DMRS PSSCH can be sequentially mapped onto the symbols corresponding to the PSSCH transmission features in a time unit, thus obtaining the DMRS pattern illustrated in Figure 41.

[00607] Furthermore, in time unit #1 of Figure 41, there are 7 DMRS symbols to transmit PSSCH later than the last DMRS symbol, and the symbol gap ratio (the value of 8) between adjacent DMRS symbols is 0.875. If the second threshold value is 0.5, the last symbol of the PSSCH transmission features can also be used to map the DMRS. In time unit #2 of Figure 41, there are 6 symbols to transmit PSSCH later than the last DMRS symbol, and the symbol gap ratio between adjacent DMRS symbols (the value is 8) is 0.75. If the second threshold value is 0.5, the last symbol of the PSSCH transmission features can also be used to map the DMRS, as illustrated in Figure 42.

[00608] In some implementations, if the first Petition 870250078539, dated 03 / 09 / 2025, page 185 / 580 If a 178 / 241 time unit is used to transmit a plurality of PSSCHs, and the plurality of PSSCHs is used to transmit the same TB (see Mode 2.2 above), since the plurality of PSSCHs transmits the same TB, the plurality of PSSCHs are PSSCHs transmitted to the same receiving device. Therefore, the DMRS mapping method used by the plurality of PSSCHs can be similar to the DMRS mapping method in a case where one PSSCH is transmitted in a time unit, i.e., DMRSs are mapped sequentially to all symbols used to transmit PSSCHs in the first time unit based on the first information. For convenience of description, the DMRS mapping method is referred to as method 1 below.

[00609] In some implementations, if the first time unit is used to transmit a plurality of If multiple PSSCHs and multiple PSSCHs are used to transmit the same TB (see Mode 2.2 above), the DMRSs are sequentially mapped to symbols corresponding to the plurality of PSSCHs based on the first piece of information. For example, for each PSSCH in the plurality of PSSCHs, a time-domain position of the first PSSCH DMRS symbol can be determined based on the second piece of information, and a symbol interval between two adjacent PSSCH DMRS symbols can be determined based on the third piece of information. Then, the PSSCH DMRS can be sequentially mapped to the symbols corresponding to the transmission features of each PSSCH. The DMRS mapping processes between different PSSCHs are independent of each other. For convenience of description, the DMRS mapping method is referred to as method 2 below. Petition 870250078539, dated 03 / 09 / 2025, p. 186 / 580 179 / 241

[00610] For example, Figure 43 (including Figures 43A to 43C) illustrates two time units, namely a time unit #1 and a time unit #2. The first time unit can be either time unit #1 or time unit #2. In the example in Figure 43, one time unit includes 2 slots, time unit #1 does not include PSFCH transmission resources, and time unit #2 includes PSFCH transmission resources. The allocation of PSSCH resources in a time unit starts from the fifth symbol, i.e., A equals 4. The first 4 symbols of a time unit can be used as AGC, and the last 4 symbols of a time unit are used as GP, i.e., B equals 4. Two PSSCHs are transmitted in a time unit, i.e., each slot is used to transmit one PSSCH. The time-domain features of PSCCH include 3 symbols starting from the fifth symbol in a time unit. The number of symbols that can be used to transmit PSSCH in the second slot of time unit #2 (i.e., slot (n+3) in Figure 43) is 1, but since PSSCH 2 transmitted in slot and PSSCH 1 transmitted in the first slot of time unit #2 (i.e., slot (n+2) in Figure 43) are both used to transmit different redundant versions of the same TB, PSSCH 2 can still be transmitted in the second slot of time unit #2. If it is determined based on the second piece of information that the first DMRS symbol of PSSCH corresponds to the first symbol of PSSCH, there are 8 symbols between two adjacent PSSCH DMRS symbols. If the DMRS pattern is determined using method 1, i.e., DMRS is mapped sequentially across all PSSCH symbols in a time unit based on the time domain position of the first. Petition 870250078539, dated 03 / 09 / 2025, page 187 / 580 180 / 241 DMRS symbol and in the symbol range between two adjacent PSSCH DMRS symbols, a DMRS mapping result illustrated in Figure 43A can be obtained. If method 2 is used to determine the DMRS pattern, for each PSSCH in a time unit, the DMRS pattern is determined according to the second and third information, respectively, and the DMRS mapping result is illustrated in Figure 43B. If it is determined that the first DMRS symbol of the PSSCH corresponds to the second symbol of the PSSCH based on the second information, there are 8 symbols between two adjacent PSSCH DMRS symbols. If method 2 is used to determine the DMRS pattern, for each PSSCH in a time unit, the DMRS pattern is determined according to the second and third information, respectively, and the DMRS mapping result is illustrated in Figure 43C.

[00611] As another example, Figure 44 illustrates two time units, namely a time unit #1 and a time unit #2. The first time unit can be either time unit #1 or time unit #2. In the example in Figure 44, a time unit includes 4 slots, and the allocation of PSSCH resources in a time unit starts from the ninth symbol, i.e., A equals 8, the first 8 symbols of a time unit can be used as AGC, and the last 8 symbols of a time unit are used as GP, i.e., B equals 8. Two PSSCHs are transmitted in a time unit, i.e., every two slots are used to transmit one PSSCH. The resources in the PSSCH time domain include 3 symbols starting from the ninth symbol in a time unit. The transmission resource Petition 870250078539, dated 03 / 09 / 2025, page 188 / 580 181 / 241 PSFCH is included in time unit #2, and therefore the number of symbols available to transmit PSSCH in the third slot and fourth slot is 3. However, since PSSCH 2 transmitted in slot #2 and PSSCH 1 transmitted in the first two slots in time unit #2 are used to transmit different redundant versions of the same TB, PSSCH 2 can still be transmitted in slot #2. It is determined based on the second piece of information that the first DMRS symbol of PSSCH corresponds to the first symbol of PSSCH, and it is determined based on the third piece of information that there are 8 symbols between two adjacent DMRSs. If method 1 is used, the DMRS pattern in a time unit is illustrated in Figure 44A. If method 2 is used, the DMRS pattern in a time unit is illustrated in Figure 44B.

[00612] In some implementations, if the first time unit is used to transmit a plurality of PSSCHs and the plurality of PSSCHs is used to transmit different TBs (see Mode 2.3 above), DMRSs are mapped sequentially to all symbols used to transmit PSSCHs in the first time unit based on the first information. For example, if a plurality of TBs is transmitted to the same receiving device, this implementation can be used to map the DMRS pattern.

[00613] In some implementations, if the first time unit is used to transmit a plurality of PSSCHs and the plurality of PSSCHs is used to transmit different TBs (see Modality 2.3 above), the DMRSs are sequentially mapped to symbols corresponding to the plurality of PSSCHs based on the first information. Petition 870250078539, dated 03 / 09 / 2025, page 189 / 580 182 / 241

[00614] For example, Figure 45 illustrates two time units, namely a time unit #1 and a time unit #2. The first time unit can be either time unit #1 or time unit #2. In the example in Figure 45, a time unit includes 2 slots, and the allocation of PSSCH resources in a time unit starts from the fifth symbol, i.e., A equals 4, the first 4 symbols of a time unit can be used as AGC, and the last 4 symbols of a time unit are used as GP, i.e., B equals 4. Two PSSCHs are transmitted in a time unit, i.e., each slot is used to transmit one PSSCH. The second slot of time unit #2 (i.e., slot n+3 in Figure 45) includes only one symbol to transmit the PSSCH and therefore the slot cannot be used to transmit different transport blocks.Therefore, the PSSCH in the slot can be used to repeatedly transmit the data of the first symbol or the last symbol of the PSSCH (i.e., PSSCH 1) in the previous slot to improve transmission reliability. It can be determined based on the second piece of information that the first DMRS symbol of PSSCH corresponds to the first symbol of PSSCH, and it can be determined based on the third piece of information that the symbol interval between two adjacent DMRS symbols is 8, and therefore the result of the DMRS mapping is illustrated in Figure 45. Since the data transmitted by PSSCH 2 in the second slot of time unit #2 is a repetition of the data from PSSCH 1, the first PSSCH symbol in the slot cannot be mapped to DMRS. In some implementations, the first PSSCH symbol in the slot can also be mapped to DMRS. Petition 870250078539, dated 03 / 09 / 2025, pp. 190 / 580 183 / 241

[00615] As another example, Figure 46 illustrates two time units, namely a time unit #1 and a time unit #2. The first time unit can be either time unit #1 or time unit #2. In the example in Figure 46, a time unit includes 4 slots, and the allocation of PSSCH resources in a time unit starts from the fifth symbol, i.e., A equals 4, the first 4 symbols of a time unit can be used as AGC, and the last 4 symbols of a time unit are used as GP, i.e., B equals 4. Two PSSCHs are transmitted in a time unit, i.e., each two slots are used to transmit one PSSCH, each PSSCH transmits a different TB, and each PSSCH has its corresponding PSCCH. In a given time unit, the first two slots transmit PSSCH 1 and the last two slots transmit PSSCH 2. Time unit #2 includes PSFCH transmission capabilities.Based on the second piece of information, it can be determined that the first DMRS symbol of the PSSCH corresponds to the first symbol of the PSSCH, and based on the third piece of information, it can be determined that there are 8 symbols between two adjacent DMRSs. For each PSSCH, a corresponding DMRS is determined according to the above information, and the result of the DMRS mapping is illustrated in Figure 46A.

[00616] Furthermore, in time unit #1 in Figure 46A, there are 7 symbols to transmit PSSCH later than the last DMRS symbol corresponding to PSSCH 1, and the gap ratio between adjacent DMRS symbols (the value is 8) is 0.875. If a second threshold value is 0.5, the last symbol of the PSSCH 1 transmission feature can also be used to map the DMRS; last than last Petition 870250078539, dated 03 / 09 / 2025, page 191 / 580 In time unit #2 in Figure 46A, there are 7 symbols to transmit PSSCH later than the last DMRS symbol corresponding to PSSCH 1, and the ratio of the interval between adjacent DMRS symbols (the value is 8) is 0.875, which is greater than the second limit value. Therefore, the last symbol of the PSSCH 2 transmission feature can also be used to map the DMRS. There are 6 symbols to transmit PSSCH later than the last DMRS symbol corresponding to PSSCH 2, and the ratio of the interval between adjacent DMRS symbols (the value is 8) is 0.75, which is greater than the second limit value.In this case, the last symbol of the PSSCH 2 transmission resource can also be used to map DMRS. The result of mapping the DMRS pattern is illustrated in Figure 46B. MODALITY 6.1.2: A DMRS STANDARD FOR A FIRST PSSCH IS DETERMINED BASED ON A FIRST DMRS STANDARD.

[00617] In some implementations, a first DMRS pattern is determined based on predefined information in a protocol, pre-configured information, network device configuration information, or indication information sent by a terminal device. The terminal device may be a link-side data transmission device or a link-side data receiver device.

[00618] In some implementations, the first Petition 870250078539, dated 03 / 09 / 2025, page 192 / 580 The 185 / 241 DMRS standard is determined based on a DMRS standard corresponding to a PSSCH transmitted in a single slot.

[00619] In some implementations, each slot in a first time unit corresponds to the same first DMRS pattern. If each slot of a time unit has the same first DMRS pattern, the time unit's SCIs will only need to indicate the DMRS pattern, thus saving control signaling overhead.

[00620] In some implementations, a first PSSCH is one of a plurality of PSSCHs transmitted in the first time unit, and the plurality of PSSCHs corresponds to the same first DMRS pattern. If a plurality of PSSCHs transmitted in a time unit have the same first DMRS pattern, the SCIs transmitted in the time unit only need to indicate the DMRS pattern, thus saving control signaling overhead.

[00621] In some implementations, a first PSSCH includes a plurality of slots. A plurality of slots corresponds to the same first DMRS pattern.

[00622] In some implementations, a first PSSCH includes a plurality of slots, and each of the pluralities of slots corresponds to a respective first DMRS pattern. That is, each slot in the plurality of slots corresponds to a first DMRS pattern, and the first DMRS patterns corresponding to different slots in a plurality of slots may be the same or different.

[00623] In some implementations, a first PSSCH is one of a plurality of PSSCHs transmitted in a first time unit, and each of the plurality of PSSCHs corresponds to a respective first DMRS pattern. That is, Petition 870250078539, dated 03 / 09 / 2025, p. 193 / 580 186 / 241 each PSSCH in the plurality of PSSCHs corresponds to a first DMRS pattern, and the first DMRS patterns corresponding to different PSSCHs in the plurality of PSSCHs may be the same or different.

[00624] Different PSSCHs or different slots in a time unit may correspond to different first DMRS standards. The transmitting device can flexibly select the respective DMRS standard corresponding to each PSSCH according to the MCS or transmission block (TB) performance requirements, thus ensuring transmission performance of different TBs.

[00625] In some implementations, a first DMRS pattern is used to determine a relative position between each DMRS PSSCH symbol and a target symbol in a slot. The target symbol may be a symbol in the slot.

[00626] For example, the target symbol could be the first symbol in the slot.

[00627] As another example, the target symbol may be the first symbol available for side link transmission in the range.

[00628] As another example, the target symbol may be the first symbol available for PSSCH transmission in the slot.

[00629] In some implementations, the SCIs transmitted in a first time unit indicate a first DMRS pattern.

[00630] In some implementations, a time interval (or a symbol interval) of a DMRS symbol relative to a first symbol of a first PSSCH is determined based on a first DMRS pattern, and the Petition 870250078539, dated 03 / 09 / 2025, page 194 / 580 187 / 241 positions of one or more DMRS symbols are determined based on the time interval and the position of the first symbol of a PSSCH in a first slot, where the first slot is used to transmit the first PSSCH.

[00631] In some implementations, if a symbol position corresponding to a first DMRS symbol exceeds a position of the last symbol available for PSSCH transmission in a first slot, the first DMRS symbol will not be mapped in the first slot, where the first DMRS symbol is a DMRS symbol of one or more DMRS symbols. That is, in this implementation, only a portion of the DMRS symbols in a first DMRS pattern can be mapped.

[00632] In some implementations, a first DMRS pattern corresponds to a DMRS pattern in a case where all symbols in a slot are used for PSSCH transmission.

[00633] In some implementations, a first DMRS pattern may correspond to a first number of symbols in a slot. There may be a plurality of ways to define the first number of symbols, and two possible ways of defining it are given below. METHOD OF DEFINITION 1: THE FIRST NUMBER OF SYMBOLS is the number of symbols (or the maximum number of symbols) available for PSSCH transmission in a slot in the case where a PSSCH is transmitted based on a single slot

[00634] . In some implementations, the first DMRS pattern is a DMRS pattern suitable for transmitting a PSSCH based on a single slot. The DMRS pattern in a case where the PSSCH is transmitted based on a single slot can be predefined by a protocol. For example, in an NR system. Petition 870250078539, dated 03 / 09 / 2025, page 195 / 580 188 / 241 In SL, the protocol predefines the DMRS pattern in a case where the PSSCH is transmitted based on a single slot, as illustrated in Table 1 above. If the transmitting device transmits the PSSCH, it can autonomously determine the first DMRS pattern based on Table 1 and indicate the first DMRS pattern in the SCIs transmitted along with the PSSCH. For a PSSCH transmitted over multiple slots, the transmission capability of a PSSCH can span a plurality of slots. In this case, the transmitting device can determine the first DMRS pattern based on a DMRS pattern (e.g., a DMRS pattern in Table 1) if the PSSCH is transmitted based on a single slot. Then, if a PSSCH is transmitted using a plurality of slots, the position of the DMRS symbol for each slot in a plurality of slots corresponding to a PSSCH can be determined based on the first DMRS pattern, and the first DMRS pattern is indicated in the SCIs.By directly using the DMRS standard in a case where the PSSCH is transmitted based on a single slot as the first DMRS standard and determining the position of the DMRS symbol corresponding to the PSSCH in each slot based on the first DMRS standard, direct compatibility can be achieved. It should be understood that the DMRS standard in the case where the PSSCH is transmitted based on a single slot mentioned in the embodiments of the present disclosure may be the DMRS PSSCH standard provided by the related technique (as illustrated in Table 1), or it may be a redefined DMRS standard in the case where the PSSCH is transmitted based on a single slot, or a DMRS standard determined based on configuration information in the case where the PSSCH is transmitted based on a single slot. Petition 870250078539, dated 03 / 09 / 2025, page 196 / 580 189 / 241

[00635] In some implementations, the first number of symbols corresponding to a first DMRS pattern is 13 or 14. For example, the first DMRS pattern corresponds to the DMRS pattern in a case where the PSSCH in Table 1 includes 13 symbols.

[00636] In some implementations, a first DMRS pattern is determined based on Table 1. If the number of PSCCH symbols is 3, a DMRS pattern with the number of DMRS symbols being 3 can be selected as the first DMRS pattern, and therefore the intervals of the DMRS symbols relative to a first PSSCH symbol can be determined as 1, 6, and 11, respectively. In the case of the first DMRS pattern being applied to multi-band PSSCH transmission, for each band corresponding to PSSCH, the position of the DMRS symbol in the time band can be determined according to the symbol intervals 1, 6, and 11, respectively. If the number of symbols available to transmit PSSCH in the slot is less than 12, the slot can include only a portion of the DMRS symbols in the first DMRS pattern.

[00637] Taking the transmission of a PSSCH in an initial time unit as an example, several specific examples are given below in conjunction with Figure 47 and Figure 48.

[00638] For example, Figure 47A includes a time unit #1 and a time unit #2, and the first time unit can be either time unit #1 or time unit #2. In Figure 47A, one time unit is used to transmit a PSSCH. Although the PSSCH transmission capabilities extend across a plurality of slots, the position of the DMRS symbol in each slot can be Petition 870250078539, dated 03 / 09 / 2025, page 197 / 580 190 / 241 determined based on the first DMRS pattern. In Figure 47A, the first DMRS pattern uses the DMRS pattern corresponding to the number of PSSCH symbols, which is 13, the number of PSCCH symbols, which is 3, and the number of DMRS symbols, which is 3 in Table 1. The intervals of the DMRS symbols corresponding to the first DMRS pattern relative to the first PSSCH symbol are 1, 6, and 11. Then, for each slot, the time domain position of the DMRS symbol in the slot can be determined based on the relative position. As illustrated in Figure 47A, a first slot (i.e., slot n) of time unit #1 includes 4 AGC symbols. The time domain position of the first PSSCH symbol is the fifth symbol (symbol index 4) in the slot, the first DMRS symbol position is the sixth symbol (symbol index 5), and the second DMRS symbol position is the 11th symbol (symbol index 10).Since the number of symbols available for PSSCH transmission in the slot is less than 14, the slot can only map a portion of the DMRS symbols corresponding to the first DMRS standard; that is, the slot does not include the third DMRS symbol corresponding to the first DMRS standard because the position of the third DMRS symbol, determined according to interval 11, exceeded the slot. Similarly, a second slot (i.e., slot (n+1)) of time unit #1 includes 4 symbols used as GP. The first PSSCH symbol position is the first symbol in the slot (symbol index 0), the first DMRS symbol position is the second symbol (symbol index 1), and the second DMRS symbol position is the seventh symbol (symbol index 6). Since the number of symbols available for PSSCH transmission in the slot is less than 14, the slot maps only a portion of the DMRS symbols corresponding to the first DMRS standard; that is, the slot. Petition 870250078539, dated 03 / 09 / 2025, page 198 / 580 191 / 241 does not include the third DMRS symbol corresponding to the first DMRS standard, because the third position of the DMRS symbol determined according to interval 11 is used as the symbol. GP and cannot be mapped to DMRS. The method for determining DMRS in the first slot (i.e., slot (n+2)) of time unit #2 is the same as the method for determining DMRS in the first slot (slot n) of time unit #1. The second slot (slot (n+3)) of time unit #2 includes only one PSSCH symbol. The first position of the DMRS symbol determined according to the interval is the second symbol of the slot, but the second symbol is used as GP and cannot be mapped to the DMRS; the second DMRS symbol position determined according to the range is the seventh symbol, and the seventh symbol position corresponds to the PSFCH transmission feature and cannot be mapped to DMRS; the third DMRS symbol position determined according to the range is the twelfth symbol, and the twelfth symbol is used as the GP symbol and cannot be mapped to the DMRS. Therefore, the second slot (slot (n+3)) in time unit #2 does not include a DMRS symbol. The SCIs transmitted in time unit #1 or time unit #2 may contain indication information to indicate the first DMRS pattern.

[00639] Optionally, if the DMRS symbol position in the time slot is determined based on an interval corresponding to the first DMRS standard, the number of symbols available for PSSCH transmission after the last DMRS symbol in the time slot is greater than or equal to a first limit value; or, a ratio between the number of symbols used to transmit PSSCH after the last DMRS symbol for a symbol interval between two symbols. Petition 870250078539, dated 03 / 09 / 2025, page 199 / 580 192 / 241 If adjacent DMRS symbols corresponding to the first DMRS pattern are greater than or equal to a second threshold value, the last symbol corresponding to the PSSCH transmission feature in the time slot can also be used to map DMRS. For example, in Figure 47A, there are 3 symbols to transmit PSSCH later than the last DMRS symbol in the first slot of time unit #1, and there are 3 symbols to transmit PSSCH later than the last DMRS symbol in the second slot. The interval between adjacent DMRS symbols is 5. If the second threshold value is 0.5, the last symbol of the PSSCH transmission feature in the first slot and the second slot of time unit #1 can also be used to map DMRS, as illustrated in Figure 47B. Similarly, the last symbol of the PSSCH transmission feature in the first slot of time unit #2 can also be used to map DMRS.

[00640] Furthermore, the relative position of each DMRS symbol with respect to the first symbol in a slot can also be determined based on the first DMRS pattern, and the DMRS pattern in each slot can be determined based on the relative position. For example, as illustrated in Figure 47C, the ranges of the DMRS symbols corresponding to the first DMRS pattern with respect to the first symbol in the slot are 1, 6, and 11. For the first slot of time unit #1, the positions of the DMRS symbols determined according to the first DMRS pattern should be symbols 1, 6, and 11; however, since symbol 1 is used as AGC, DMRS cannot be mapped to the symbol, and therefore only symbol 6 and symbol 11 are mapped with DMRS in the slot. For the second slot of time unit #1, the positions of the DMRS symbols Petition 870250078539, dated 03 / 09 / 2025, page 200 / 580 193 / 241 determined according to the first DMRS standard should be symbols 1, 6, and 11; however, since symbol 11 is used as GP, DMRS is not mapped to the symbol, and therefore only symbol 1 and symbol 6 are mapped to DMRS in the slot. For the first slot of time unit #2, the mapped DMRS is the same as that of the first slot of time unit #1. For the second slot of time unit #2, the DMRS symbol position determined according to the first DMRS standard should be symbols 1, 6, and 11; however, since symbols 1 and 11 are used as GP and symbol 6 is used as AGC, DMRS is not mapped to these symbols, i.e., the second slot does not include DMRS symbols.

[00641] For example, for the transmission method illustrated in Figure 48 (i.e., a PSSCH is transmitted in a time unit), although the PSSCH transmission resources span a plurality of slots, the position of the DMRS symbol in each slot can be determined separately based on the first DMRS pattern. Different time units may correspond to different first DMRS patterns. For example, the ranges of DMRS symbols corresponding to the first DMRS pattern relative to the first PSSCH symbol in time unit #1 are 1, 6, and 11; the number of symbols corresponding to the PSSCH in the second and third slots of time unit #1 is 14, and each slot can include 3 DMRS symbols. The number of symbols corresponding to the PSSCH in the first slot is 6, and therefore the slot includes only one DMRS symbol. Similarly, the number of symbols corresponding to the PSSCH in the fourth slot is also 6, and therefore the slot also includes only one DMRS symbol.The intervals between the DMRS symbols correspond to. Petition 870250078539, dated 03 / 09 / 2025, page 201 / 580 194 / 241 The first DMRS pattern and the first PSSCH symbol in time unit #2 are 3 and 10; the number of symbols corresponding to PSSCH in the second slot is 14, which may include 2 DMRS symbols, located at symbol 3 and symbol 10, respectively. The number of symbols corresponding to PSSCH in the first slot is 6, and therefore the slot includes only one DMRS symbol, and the DMRS symbol is located at the 12th symbol (i.e., symbol 11). The number of symbols corresponding to PSSCH in the third slot is 3. Based on the first DMRS pattern, the first DMRS symbol of the slot is located at the fourth symbol, i.e., symbol 3, and a position corresponding to the fourth symbol is used as GP, and thus DMRS is not mapped. The SCI transmitted in the first time unit carries indication information indicating the first DMRS pattern.

[00642] Similar to Figure 47B, in this example, the number of PSSCH symbols after the last DMRS in a slot can be compared with the first limit value or the second limit value to determine whether the last PSSCH symbol can be mapped to the DMRS, which will not be repeated here.

[00643] It should be noted that, in Figures 48 to 54, the position of the DMRS symbol (x, y) or (x, y, z) of the first DMRS pattern in the figure may represent a time shift of the DMRS symbol relative to the first PSSCH symbol.

[00644] Taking the transmission of a plurality of PSSCHs in the first time unit and a plurality of PSSCHs corresponding to the same TB as an example, several specific examples are given below in conjunction with Figure 49.

[00645] For example, for the transmission method illustrated in Figure 49 (a plurality of PSSCH is transmitted in a unit of time and the plurality of PSSCH Petition 870250078539, dated 03 / 09 / 2025, p. 202 / 580195 / 241 corresponds to the same TB), a plurality of PSSCH can be transmitted in a time unit, and the transmission resources of each PSSCH can cover a plurality of time slots. In the example in Figure 49, the position of the DMRS symbol in each slot can be determined separately based on the first DMRS pattern. Different time units may correspond to different first DMRS patterns. For example, in Figure 49A, the intervals between the DMRS symbols corresponding to the first DMRS pattern and the first PSSCH symbol in time unit #1 are 1, 6, and 11; the number of symbols corresponding to the PSSCH in the second and third slots of time unit #1 is 14, and each slot can include 3 DMRS symbols. In time unit #1, the number of symbols corresponding to the PSSCH in the first slot is 6, including only one DMRS symbol. Similarly, the number of symbols corresponding to the PSSCH in the fourth slot is also 6, also including only one DMRS symbol.The intervals between the DMRS symbols corresponding to the first DMRS pattern and the first PSSCH symbol in time unit #2 are 3 and 10; the number of symbols corresponding to PSSCH in the second slot is 14, and therefore the slot can include 2 DMRS symbols, located at symbol 3 and symbol 10, respectively; the number of symbols corresponding to PSSCH in the first slot is 6, including only one DMRS symbol, located at symbol 12; the number of symbols corresponding to PSSCH in the third slot is 3, according to the first DMRS pattern, its first DMRS symbol is located at the fourth symbol, i.e., symbol 3, and its corresponding position is used as GP, and therefore DMRS is not mapped. If time unit #2 uses the same first DMRS pattern as time unit #1, i.e. Petition 870250078539, dated 03 / 09 / 2025, page 203 / 580 196 / 241 if the intervals between the DMRS symbols and the first PSSCH symbol are 1, 6, or 11, there may be a DMRS symbol in the third slot of time unit #2, as illustrated in Figure 49B.

[00646] Since the PSSCH in a time unit transmits the same TB, the first time unit can only include one PSCCH, and the first DMRS pattern is indicated by the SCIs carried by the PSCCH.

[00647] Taking as an example the transmission of a plurality of PSSCHs in the first time unit and a plurality of PSSCHs corresponding to different TBs, a specific example is given below in conjunction with Figure 50.

[00648] For example, for the transmission method illustrated in Figure 50 (a plurality of PSSCHs is transmitted in a time unit, and the plurality of PSSCHs corresponds to different TBs), the transmission resources of each PSSCH can span a plurality of slots, and the position of the DMRS symbol in each slot can be determined based on the first DMRS pattern. Different time units may correspond to different first DMRS patterns.For example, in Figure 50, the intervals of the DMRS symbols corresponding to the first DMRS pattern relative to the first PSSCH symbol in time unit #1 are 1, 6, and 11; the number of symbols corresponding to PSSCH in the second and third slots of time unit #1 is 14, and each slot can include 3 DMRS symbols; the number of symbols corresponding to PSSCH in the first slot is 10, and thus the slot includes only 2 DMRS symbols; similarly, the number of symbols corresponding to PSSCH in the fourth slot is also 10, and thus the slot also includes only 2 symbols. Petition 870250078539, dated 03 / 09 / 2025, p. 204 / 580 197 / 241 DMRS. The PSCCH associated with the PSSCH in time unit #1 carries indication information to indicate the first DMRS pattern corresponding to time unit #1. The intervals of the DMRS symbol corresponding to the first DMRS pattern relative to the first PSSCH symbol in time unit #2 are 3 and 10; the number of symbols corresponding to the PSSCH in the second slot and the third slot is 14, and therefore the slot can only include 2 DMRS symbols, located at symbol 3 and symbol 10, respectively; the number of symbols corresponding to the PSSCH in the first slot is 10, and therefore the slot includes only one DMRS symbol, located at symbol 7; the number of symbols corresponding to the PSSCH in the fourth slot is 1, and therefore, according to the first DMRS pattern, its first DMRS symbol is located at the fourth symbol of the slot, i.e., symbol 3. As the position of the fourth symbol is used as GP, the DMRS is not mapped.The PSCCH associated with the PSSCH in time unit #2 carries indication information to indicate the first DMRS pattern corresponding to time unit #2.

[00649] The description above is based primarily on an example where each slot of a time unit corresponds to the same DMRS pattern. In other embodiments, different PSSCHs may correspond to different DMRS first patterns, or different slots may correspond to different DMRS first patterns. If the transmission feature of a PSSCH includes a plurality of slots, the plurality of slots may correspond to the same or different DMRS patterns. In this case, the SCIs carried by the PSSCH transmitted simultaneously with the PSSCH carry indication information to indicate the Petition 870250078539, dated 03 / 09 / 2025, page 205 / 580 198 / 241 first DMRS standard. In the case of different PSSCH slots corresponding to different first DMRS standards, the indication information in the SCI includes a plurality of information fields, each of which corresponds to a respective different first DMRS standard.

[00650] For example, for the transmission method illustrated in Figure 51 (a plurality of PSSCHs is transmitted in a time unit and the plurality of PSSCHs corresponds to different TBs), a plurality of PSSCHs can be transmitted in a time unit, the transmission resources of each PSSCH can span a plurality of slots, and different PSSCHs can correspond to different first DMRS patterns. In Figure 51, the intervals between the DMRS symbols of the first DMRS pattern corresponding to PSSCH 1 and the first PSSCH symbol in time unit #1 are 3 and 10; the number of symbols corresponding to PSSCH 1 in the first slot is 10, and therefore the slot includes only 1 DMRS symbol; the number of symbols corresponding to PSSCH 1 in the second slot is 14, and therefore the slot includes 2 DMRS symbols; the indication information in the PSSCH associated with PSSCH 1 is used to indicate the first DMRS pattern.The intervals of the DMRS symbols of the first DMRS pattern corresponding to PSSCH 2 in relation to the first PSSCH symbol in time unit #1 are 1, 6 and 11;. The PSSCH 2 transmission capabilities include 2 slots, where the number of symbols corresponding to PSSCH 2 in the first slot is 14, and therefore the slot includes 3 DMRS symbols; the number of symbols corresponding to PSSCH 2 in the second slot is 10, and therefore the slot includes 2 DMRS symbols; the indication information in PSCCH associated with PSSCH 2 is Petition 870250078539, dated 03 / 09 / 2025, page 206 / 580 199 / 241 are us...

Claims

1. METHOD FOR SIDE LINK TRANSMISSION characterized by comprising: determining, by a first terminal device, a demodulation reference signal pattern (DMRS) for a first transmitted channel in a first time unit; wherein the first time unit includes M consecutive slots, and M is a positive integer greater than 1.

2. METHOD, according to claim 1, characterized in that the first channel includes a first shared physical side link channel (PSSCH), the DMRS pattern for the first PSSCH is determined based on first information, and the first information includes one or more of the following: second information, used to determine a position in the time domain of the first DMRS PSSCH symbol; and third information, used to determine a symbol interval between two adjacent DMRS PSSCH symbols.

3. METHOD, according to claim 2, characterized in that the second piece of information is used to indicate one or more of the following pieces of information: a position in the time domain of the first PSSCH DMRS symbol in a slot; a position in the time domain of the first PSSCH DMRS symbol in a unit of time; a deviation in the time domain of the first PSSCH DMRS symbol relative to the first symbol corresponding to a PSSCH transmission resource; Petition 870250078539, dated 03 / 09 / 2025, p.250 / 580 2 / 5 a time-domain deviation of the first PSSCH DMRS symbol relative to the first symbol in a slot; a time-domain deviation of the first PSSCH DMRS symbol relative to the first symbol in a unit of time; a time-domain deviation of the first PSSCH DMRS symbol relative to the first symbol corresponding to a physical side link control channel (PSCCH) transmission resource; and a time-domain deviation of the first PSSCH DMRS symbol relative to the last symbol corresponding to a PSCCH transmission resource.

4. METHOD, according to claim 2 or 3, characterized in that the first information is used to configure one or more candidate DMRS standards of a PSSCH, and the DMRS standard for the first PSSCH is a target DMRS standard in one or more candidate DMRS standards.

5. METHOD, according to claim 3 or 4, characterized in that if the first time unit is used to transmit a PSSCH, the DMRSs are sequentially mapped to all symbols used to transmit the PSSCH in the first time unit based on the first information; or if the first time unit is used to transmit a plurality of PSSCHs and the plurality of PSSCHs is used to transmit the same transport block (TB), the DMRSs will be sequentially mapped to all symbols used to transmit PSSCHs in the first time unit based on the first information; or Petition 870250078539, dated 03 / 09 / 2025, p.251 / 580 3 / 5 if the first time unit is used to transmit a plurality of PSSCHs and the plurality of PSSCHs is used to transmit the same TB, the DMRSs are sequentially mapped to symbols corresponding, respectively, to the plurality of PSSCHs based on the first information; or if the first time unit is used to transmit a plurality of PSSCHs and the plurality of PSSCHs is used to transmit different TBs, the DMRSs are sequentially mapped to all symbols used to transmit PSSCHs in the first time unit based on the first information; or if the first time unit is used to transmit a plurality of PSSCHs and the plurality of PSSCHs is used to transmit different TBs, the DMRSs are sequentially mapped to symbols corresponding, respectively, to the plurality of PSSCHs based on the first information.

6. METHOD, according to claim 2, characterized by the DMRS pattern for the first PSSCH being determined based on a first DMRS pattern; wherein a time interval of a DMRS symbol relative to the first symbol of the first PSSCH is determined based on the first DMRS pattern, and the positions of one or more DMRS symbols are determined based on the time interval and position of the first symbol of a PSSCH in a first slot; wherein the first slot is used to transmit the first PSSCH.

7. METHOD, according to claim 6, characterized by the first DMRS pattern being used to determine a relative position between each DMRS PSSCH symbol and a target symbol in a slot; where the target symbol is one of the following: the first symbol in the slot; the first symbol available for side link transmission in the window; and the first symbol available for PSSCH transmission in the slot.

8. METHOD, according to any one of claims 2 to 7, characterized by the DMRS for the first PSSCH occupying a first physical feature block (PRB) in the frequency domain, each H1 subcarrier in the first PRB being used to map the DMRS, and H1 being a positive integer greater than or equal to 1.

9. METHOD, according to any one of claims 1 to 8, characterized in that at least one slot of the M slots does not include a guard symbol; and / or the last slot of the M slots includes a guard symbol, and the remaining slots of the M slots other than the last slot do not include a guard symbol; and / or if the first time unit includes a time domain feature to transmit a PSFCH, the last track and / or a second-to-last track of the M tracks includes a guard symbol; and / or a guard symbol is defined between the symbols used for side-link transmission in adjacent slots of the M slots; and / or the first time unit includes third time domain features to transmit a PSSCH, Petition 870250078539, dated 03 / 09 / 2025, p. 253 / 580 5 / 5 initial symbol of the resources of the third time domain being the (A+1)-th symbol in the first time unit, and A being a positive integer greater than 1.

10. TERMINAL DEVICE characterized by comprising a transceiver, a memory, and a processor, wherein the memory is configured to store a computer program, and the processor is configured to execute the computer program stored in the memory and control the transceiver to receive or transmit signals, to enable the terminal device to execute the method as defined in any one of claims 1 to 9.

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