Method, apparatus, and first terminal for determining cyclic prefix extension

Abstract

The present invention provides a method, apparatus and first terminal for determining cyclic prefix extension, the method being applied to the first terminal and comprising determining a CPE start position corresponding to a target transmission resource of the first transmission based on transmission type information satisfied by the first transmission, wherein the transmission type information includes at least one of the following: belonging to a transmission after a first channel access type; belonging to a transmission after a second channel access type; having no available shared channel occupancy information; having one available shared channel occupancy information; having at least two available shared channel occupancy information; and belonging to a continuous multi-slot transmission.

Description

Technical Field

[0001] <Cross-reference to Related Applications> This invention claims the priority of Chinese Patent Application No. 202310361788.8 filed in China on April 6, 2023, the content of which is hereby incorporated by reference in its entirety into this invention.

[0002] This invention relates to the field of communication technologies, and particularly to a method, an apparatus, and a first terminal for determining cyclic prefix extension.

Background Art

[0003] In a New Radio in-Unlicensed Spectrum (NR-U) operating in an unlicensed spectrum, when a user equipment (UE, i.e., a terminal) is scheduled to perform uplink transmission, the base station instructs the UE to use a channel access method corresponding to the uplink transmission through Downlink Control Information (DCI). Since some channel access methods need to meet the gap requirements of 16 us or 25 us, the UE can ensure the size of the gap between two transmissions by transmitting in a manner of Cyclic Prefix Extension (CPE). Accordingly, the base station can instruct the UE about the CPE length of the first symbol of the uplink transmission.

[0004] Currently, in Sidelink (SL), the UE needs to perform data transmission in a self-scheduling manner. However, there is currently no feasible solution regarding how the UE can determine the CPE length by itself without the cooperation of the base station to ensure that the sidelink traffic in the unlicensed spectrum can be transmitted in a timely and reliable manner.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention provides a method, apparatus, and first terminal for determining cyclic prefix extension, solving the problem of how a terminal can determine the length of its CPE without the cooperation of a base station. [Means for solving the problem]

[0006] According to the first aspect, embodiments of the present invention provide a method for determining cyclic prefix extensions applied to a first terminal, the method being The process includes determining the cyclic prefix extension CPE start position corresponding to the target transmission resource of the first transmission based on the transmission type information that the first transmission satisfies, Of these, the transmission type information is It belongs to a transmission after the first channel access type. It belongs to transmission after the second channel access type. No information is available regarding the use of available shared channels. There must be one available shared channel reservation. There must be at least two available shared channel occupancy records. This includes at least one of the following: belonging to continuous multi-slot transmission.

[0007] According to a second aspect, an embodiment of the present invention provides a first terminal comprising a transceiver, a memory, a processor, and a computer program stored in the memory and executable by the processor, wherein the processor, upon executing the computer program, implements the steps of a method for determining cyclic prefix extensions as described in the first aspect.

[0008] According to a third aspect, an embodiment of the present invention provides an apparatus for determining cyclic prefix extension, which is applied to a first terminal, and the apparatus is Includes a first determination module configured to determine a CPE start position corresponding to the target transmission resource of the first transmission based on transmission type information satisfied by the first transmission, Of these, the transmission type information is It belongs to a transmission after the first channel access type. It belongs to transmission after the second channel access type. No information is available regarding the use of available shared channels. There must be one available shared channel reservation. There must be at least two available shared channel occupancy records. This includes at least one of the following: belonging to continuous multi-slot transmission.

[0009] According to the fourth aspect, embodiments of the present invention provide a computer-readable storage medium in which a computer program is stored, and which, when executed by a processor, implements the steps of a method for determining cyclic prefix extensions as described in the first aspect. [Effects of the Invention]

[0010] The beneficial effects of the above-described technical embodiment of the present invention are as follows. In the above embodiment, the first terminal determines the cyclic prefix extension CPE start position corresponding to the target transmission resource of the first transmission based on the transmission type information satisfied by the first transmission, the transmission type information including at least one of the following: belonging to a transmission after a first channel access type; belonging to a transmission after a second channel access type; there is no available shared channel occupancy information; there is one available shared channel occupancy information; there are at least two available shared channel occupancy information; and belonging to a continuous multi-slot transmission. In this way, the terminal can determine the length of the CPE on its own without the cooperation of the base station, thereby ensuring that sidelink traffic in the unlicensed spectrum is transmitted in a timely and reliable manner. [Brief explanation of the drawing]

[0011] [Figure 1] A flowchart of a method for determining a cyclic prefix extension according to an embodiment of the present invention is shown. [Figure 2] A schematic diagram 1 of a CPE according to an embodiment of the present invention is shown. [Figure 3] A schematic diagram 2 of a CPE according to an embodiment of the present invention is shown. [Figure 4] A schematic diagram 3 of a CPE according to an embodiment of the present invention is shown. [Figure 5] A schematic diagram 4 of a CPE according to an embodiment of the present invention is shown. [Figure 6] A schematic diagram 5 of a CPE according to an embodiment of the present invention is shown. [Figure 7] A schematic diagram 6 of a CPE according to an embodiment of the present invention is shown. [Figure 8] A structural block diagram of an apparatus for determining a cyclic prefix extension according to an embodiment of the present invention is shown. [Figure 9] A schematic diagram of the hardware structure of a first terminal according to an embodiment of the present invention is shown.

Embodiments for Carrying out the Invention

[0012] In order to more clearly illustrate the technical problems, technical solutions, and advantages to be solved by the present invention, the following will be described in detail with reference to the drawings and specific embodiments. In the following description, the specific arrangements and specific details of the components provided are only for comprehensively understanding the embodiments of the present invention. Therefore, those skilled in the art can make various changes and modifications to the embodiments described herein without departing from the scope and spirit of the present invention. Also, descriptions of known functions and configurations are omitted for clarity and brevity.

[0013] In addition, the "one embodiment" or "an embodiment" described throughout the specification means that specific configurations, structures, or characteristics related to the embodiment are included in at least one embodiment of the present invention. Therefore, the "in one embodiment" or "in an embodiment" described in each part of the specification does not necessarily refer to the same embodiment. Further, these specific configurations, structures, or characteristics may be combined with one or more embodiments in any suitable manner.

[0014] In various embodiments of the present invention, the magnitude of the numbers of the following respective processes does not indicate the order of execution before and after, and it should be understood that the execution order of each process is determined by its respective functions and inherent logic and does not impose any restrictions on the implementation process of the embodiments of the present invention.

[0015] In addition, the terms "system" and "network" in this document can generally be used interchangeably in this document.

[0016] In addition, in the embodiments according to the present invention, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, determining B based on A does not mean determining B based only on A, but means that B can be determined based on A and / or other information.

[0017] Hereinafter, while referring to the drawings in the embodiments of the present invention, the technical aspects in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the present invention.

[0018] I. NR-U Channel Access Process The channel access process in the shared spectrum is a process based on sensing, which evaluates the availability of the channel for transmission. The basic unit of sensing is of length Tsl This is a sensing slot with a value of 9us. One eNB / gNB or one UE performs sensing in the sensing slot, and at least 4us of monitored energy within the sensing slot is detected by the energy detection threshold X. Thresh If it is determined to be lower than the sensing slot duration T, the sensing slot is considered idle; otherwise, the sensing slot duration T is considered idle. sl It is considered busy.

[0019] The NR-U system's channel access process is divided into two types: Type 1 and Type 2. Type 2 is further divided into three channel access methods: Type 2A, Type 2B, and Type 2C. The following describes these two types of channel access processes using the downlink channel access method as an example.

[0020] 1. Type 1 (i.e., first channel access type, or may also be called channel access type 1) The eNB / gNB can sense that the channel is idle within a sensing slot duration of backoff time Td and transmit a transmission after the value of counter N in step 4 becomes 0. Counter N is adjusted by sensing an additional sensing slot duration according to the following steps.

[0021] In step 1, we set N=Ninit, where Ninit is a random number uniformly distributed between 0 and CWp, and then proceed to step 4.

[0022] In step 2, if N > 0 and eNB / gNB chooses to decrease the counter, set N = N-1.

[0023] In step 3, a channel is detected within one additional sensing slot duration. If the additional sensing slot duration is idle, the process proceeds to step 4; otherwise, it proceeds to step 5.

[0024] In step 4, if N=0, the process stops; otherwise, it proceeds to step 2.

[0025] In step 5, channels are detected until one busy sensing slot is detected within one additional backoff time Td, or until all sensing slots within the additional backoff time Td are idle.

[0026] In step 6, if all sensing slot channels in Td are idle, proceed to step 4; otherwise, proceed to step 5.

[0027] Here, Td is given by Tf = 16us and immediately after m p It consists of several consecutive sensing slot duration Tsl, and Tf includes the idle sensing slot duration Tsl located at the beginning of one Tf.

[0028] JPEG2026513321000002.jpg26170

[0029] Specifically, Table 1 below describes the Channel Access Priority Class (CAPC).

[0030] JPEG2026513321000003.jpg75170

[0031] 2. Type 2 (which may also be called the second channel access type or channel access type 2) specifically includes the following three types:

[0032] Type 2A channel access is performed by the following transmissions via eNB / gNB, namely, A transmission initiated by an eNB, which does not include a PDSCH, includes a discovery burst, and has a maximum transmission duration of 1 ms. A transmission having only a discovery burst or a transmission initiated by a gNB with multiplexed discovery bursts of non-unicast information, wherein the transmission duration is a maximum of 1 ms and the duty cycle of the discovery burst is a maximum of 1 / 20, and This applies only to eNB / gNB transmissions that occur 25us after a transmission occupied by the UE on the shared channel.

[0033] Type 2B or Type 2C channel access applies to gNB transmissions that occur 16us or up to 16us after the transmission occupied by the UE on the shared channel, respectively.

[0034] Type 2A JPEG2026513321000004.jpg37170

[0035] Type 2B JPEG2026513321000005.jpg26170

[0036] Type2C gNB does not perform channel sensing before downlink transmission, and the downlink transmission time is a maximum of 584us.

[0037] Furthermore, if the gNB shares channel occupancy initiated by the UE's channel occupancy program, the gNB may perform the transmission after the UL transmission that schedules the resources, or after one gap of resources placed in the UE PUSCH transmission, specifically as follows:

[0038] The transmission should include a transmission to the UE initiating channel occupancy and may include non-unicast and / or unicast transmissions, of which any unicast transmissions containing user plane data should be transmitted only to the UE initiating channel occupancy.

[0039] If the gap is 25us or 16us, the gNB can perform transmission after performing a Type 2A or Type 2B channel access.

[0040] If the gap is less than 16us, the gNB can perform transmission after performing a Type2C channel access.

[0041] If a gNB initiates a transmission using a Type 1 channel access program and shares the corresponding channel occupancy with the UE, the gNB can transmit after the UE has transmitted in that channel occupancy, provided that no interval between any two transmissions in the gNB channel occupancy exceeds 25us. In this case, if the gap is 25us or 16us, the gNB can transmit after performing a Type 2A or Type 2B channel access; if the gap is less than 16us, the gNB can transmit after performing a Type 2C channel access.

[0042] 2. NR-U's CPE In NR-U, when a UE is scheduled to perform a PUSCH or PUCCH transmission, the base station can instruct the channel access scheme corresponding to the PUSCH or PUCCH using DCI carrying UL grant or DL ​​grant. Since some channel access schemes need to satisfy a gap requirement of 16us or 25us, the UE can ensure the size of the gap between two transmissions by the scheme for transmitting the CPE, and accordingly, the base station can instruct the UE on the CPE length of the first symbol of the uplink transmission. When specifically instructing, the base station can explicitly instruct the UE on channel access parameters such as CPE length, channel access scheme, or channel access priority class using a co-coding scheme, and the method of instructing on channel access introduced in different DCI formats will also differ, taking DCI format 0_0 as an example, as follows:

[0043] The fall backup link grant (DCI format 0_0) for scheduling push transmissions is as follows:

[0044] The sets jointly designated by the pre-configured channel access method and CPE length are shown in Table 2 below.

[0045] JPEG2026513321000006.jpg45170

[0046] JPEG2026513321000007.jpg38170

[0047] It includes 2 bits of LBT instruction information to indicate the co-coded channel access scheme and CPE length.

[0048] The channel access method and CPE length described herein are used for PUSCH transmission.

[0049] If the channel access method is Type 1, the UE will automatically select the channel access priority class based on traffic priority.

[0050] As can be seen from the above, in related technologies, both the NR-U channel access method and CPE length are instructed by the base station, and the UE can confirm the channel access method and CPE length to adopt based on the received instruction information, so there is no situation in which the CPE length setting is unreasonable and the UE cannot transmit. However, in sidelink, the UE needs to autonomously decide on the transmission resources and transmit the CPE accordingly without the cooperation of the base station. If two transmissions are in the same slot but have different CPE lengths, the transmission with the relatively shorter CPE length may be dropped due to LBT failure. Therefore, in order to ensure that sidelink traffic is transmitted in a timely and reliable manner, the CPE transmission method applied to sidelink channel access (SL-U) needs to be considered.

[0051] Specifically, embodiments of the present invention provide a method, apparatus, and first terminal for determining cyclic prefix extension, solving the problem of how a terminal can independently determine the length of its CPE without the cooperation of a base station in related technologies.

[0052] First Example As shown in Figure 1, an embodiment of the present invention provides a method for determining cyclic prefix extensions applied to a first terminal, the method specifically comprising the following steps. In step 101, the cyclic prefix extension (CPE) start position corresponding to the target transmission resource of the first transmission is determined based on the transmission type information that the first transmission satisfies. Of these, the transmission type information is It belongs to a transmission after the first channel access type. It belongs to transmission after the second channel access type. No information is available regarding the use of available shared channels. There must be one available shared channel reservation. There must be at least two available shared channel occupancy records, and This includes at least one of the following: belonging to continuous multi-slot transmission.

[0053] Here, the first channel access type refers to the Type 1 channel access type described above, and the second channel access type refers to the Type 2 channel access type described above.

[0054] Selectively, the first transmission includes at least one of the following: current physical sidelink control channel (PSCCH) transmission, current physical sidelink shared channel (PSSCH) transmission, transmission of any one slot in a continuous multi-slot transmission, and transmission of the first slot in a continuous multi-slot transmission.

[0055] In the above embodiment, the first terminal determines the CPE start position corresponding to the target transmission resource of the first transmission based on the transmission type information that the first transmission satisfies, thereby providing a manner in which the terminal can determine the CPE length itself without the cooperation of the base station, and ensuring that sidelink traffic in the unlicensed spectrum is transmitted in a timely and reliable manner.

[0056] Below, we will describe how to determine the CPE start position of the first transmission in several cases, based on the transmission type information that the first transmission satisfies.

[0057] Case 1 The first transmission is a transmission following the first channel access type, and / or the first transmission does not have available shared channel occupancy information.

[0058] In one embodiment, in step 101 above, determining the CPE start position corresponding to the transmission resource of the first transmission based on the transmission type information is: If the first transmission is a transmission following a first channel access type and / or if there is no shared channel occupancy information available for the first transmission, the CPE start position corresponding to the transmission resource of the first transmission is set. Default 1st CPE start position, One of the pre-configured CPE starting positions is randomly selected. The CPE start position mapped to the channel access priority class (CAPC) level of the first transmission, and This includes determining the CPE start position as one of the CPE start positions mapped to the Prose Per-Packet Priority (PPPP) of the first transmission.

[0059] When selectively and specifically implemented, the default first CPE start position primarily considers the following application scenarios: When a terminal transmission is used to initiate a single channel occupancy, i.e., when a terminal accesses a channel using a Type 1 channel access method, the default first CPE start position can be used for the CPE of this transmission. For example, by defaulting on the longest CPE set by the upper layer or pre-configured, the UE can ensure that a single channel occupancy can be successfully initiated.

[0060] Selectively, the default first CPE start position is a fixed CPE start position set by the higher tier or pre-configured.

[0061] In a selective and specific implementation, for terminals using the Type 1 (first channel access type) channel access method, or terminals initiating single channel occupancy, one CPE start position to be used for the first transmission may be determined from among multiple CPE start positions set in the resource pool, based on the CAPC level or PPPP value of its own transmission.

[0062] For example, as shown in Figure 3, if UE1 attempts to transmit a transmission with a CAPC level of 2, the CPE start position can be determined based on the CPE start position mapped to a CAPC level of 2.

[0063] In the above embodiment, by adopting the default first CPE start position, it is possible to ensure that the CPE start position used for transmission is the same for all transmissions, and the problem of transmissions with relatively short CPE lengths being dropped due to LBT failure, which can occur when two transmissions are in the same slot but have different CPE lengths, is avoided. Furthermore, by determining the CPE start position based on the CAPC level or PPPP value, it is possible to enable higher-priority transmissions to access the channel preferentially, and it is possible to ensure reliable transmission of traffic that is sensitive to the tolerance of time delay (i.e., has high demands for time delay). Randomly selecting one from a pre-configured CPE start position is simpler and more efficient.

[0064] Case 2 The first transmission is a transmission following the second channel access type, and / or the first transmission has one available shared channel occupancy information.

[0065] In one embodiment, in step 101 above, determining the CPE start position corresponding to the transmission resource of the first transmission based on the transmission type information is: If the first transmission is a transmission following the second channel access type and / or there is one shared channel occupancy available for the first transmission, the CPE start position corresponding to the transmission resource of the first transmission is set Default second CPE start position, One of the pre-configured CPE starting positions is randomly selected. The CPE start position mapped to the CAPC level of the first transmission, The CPE start position mapped to PPPP of the first transmission, The CPE start position mapped to the CAPC level of the second transmission, which is the transmission of the second terminal that initiates shared channel occupancy. The CPE start position mapped to PPPP of the second transmission, This includes determining the CPE start position as one of the CPE start positions indicated in the shared channel occupancy information.

[0066] When selectively and specifically implemented, the default second CPE start position primarily considers the following application scenarios: When terminal transmission is used to perform transmission within a single shared channel, i.e., when the terminal accesses the channel using a Type 2 channel access method, the default second CPE start position can be used for the CPE of this transmission. Of these, the default second CPE start position is a single fixed CPE start position set by the upper layer or pre-configured.

[0067] As an example, as shown in Figure 2, UE1 and UE2 default to the shortest CPE, which is either set by the upper layer or pre-configured, thereby ensuring that transmissions from different UEs do not interfere with each other.

[0068] In selective and specific implementations, for terminals using the Type 2 (second channel access type) channel access method, or terminals sharing a single channel, the starting position of one CPE used for transmission may be determined from among multiple CPEs configured in the resource pool based on the received shared channel occupation information. For example, the corresponding CPE starting position may be determined based on the CAPC level indicated in the received shared occupation information.

[0069] For example, as shown in Figure 4, UE1 with a CAPC level of 2 accesses the channel using the Type 1 channel access method and shares channel occupancy information with UE2 with a CAPC level of 1. In this case, when UE2 transmits within the Channel Occupancy Time (COT), it can determine the CPE length of its own transmission based on the CAPC level indicated by the shared occupancy information sent from UE1 (i.e., CAPC=2). In other words, if UE2's transmission CAPC level is different from UE1's, it can adopt the CAPC level indicated by the channel occupancy information sent by UE1 to determine the CPE length of its own transmission.

[0070] In selective and specific implementations, for terminals using a Type 2 (second channel access type) channel access method, or terminals sharing a single channel, one CPE start position to be used for the first transmission may be determined from multiple CPE start positions set in the resource pool, based on the CAPC level or PPPP value of their own transmission.

[0071] For example, as shown in Figure 5, if UE1 attempts to transmit one transmission with CAPC level 2 and UE2 attempts to transmit one transmission with CAPC level 3, they can determine the location of the CPE used for the transmission based on the CPE start position mapped to CAPC level 2 and the CPE start position mapped to CAPC level 3, respectively.

[0072] If selectively and specifically implemented, for terminals using a Type 2 (second channel access type) channel access method, or terminals sharing a single channel, the CPE start position of their own transmission may be determined based on the CAPC level or PPPP value corresponding to the transmission of the terminal initiating the shared channel access.

[0073] For example, if UE1, which has a CAPC level of 2, accesses a channel using a Type 2 channel access method and shares channel occupancy information with UE2, which has a CAPC level of 1, then when UE2 performs transmission within the COT, it can determine the CPE start position of its own transmission based on the CAPC level of UE1's transmission (i.e., CAPC=2).

[0074] In the above embodiment, by adopting the default second CPE start position, it is possible to ensure that the same CPE start position is used for both transmissions, eliminating the problem of relatively short transmissions being dropped due to LBT failures caused by two transmissions being in the same slot but having different CPE lengths. By determining the CPE start position based on the CAPC level or PPPP value of the first transmission, it is possible to ensure that higher-priority transmissions have preferential access to the channel, guaranteeing reliable transmission of traffic that is sensitive to time delay tolerance (i.e., has high demands for time delay). Randomly selecting one from a pre-configured CPE start position is simpler and more efficient. By determining the CPE start position of the first transmission based on the CAPC level, PPPP value, or specified CPE start position of the second transmission, it is possible to ensure that the same CPE start position is used within a single COT, eliminating the problem of relatively short transmissions being dropped due to LBT failures caused by two transmissions being in the same slot but having different CPE lengths. Furthermore, by prioritizing the longer COT of higher-priority COT / CPE, it is possible to ensure the reliable transmission of traffic that is sensitive to high priority / latency tolerance.

[0075] Case 3 The first transmission has at least two available shared channel occupancy pieces.

[0076] In one embodiment, in step 101 above, determining the CPE start position corresponding to the transmission resource of the first transmission based on the transmission type information is: If there are at least two shared channel occupancy information available for the first transmission, the CPE start position corresponding to the transmission resource of the first transmission is set as follows: Default 3rd CPE start position, One of the pre-configured CPE starting positions is randomly selected. The CPE start position mapped to the CAPC level of the first transmission, The CPE start position mapped to PPPP of the first transmission, CPE start position mapped to the CAPC level of target shared channel occupancy information, The CPE start position mapped to PPPP in the aforementioned target shared channel occupancy information, This includes determining the CPE start position as one of the CPE start positions indicated by the aforementioned target shared channel occupancy information, Of these, the aforementioned target shared channel occupancy information is One of the at least two available shared channel occupancy pieces of information is randomly selected from the above, Of the two available shared channel occupancy pieces mentioned above, the one with the highest PPPP value, Of the two available shared channel occupancy information items mentioned above, the one with the lowest PPPP value, Of the two available shared channel occupancy pieces mentioned above, the one with the highest CAPC level, Of the two available shared channel occupancy pieces mentioned above, the one with the lowest CAPC level, Of the two available shared channel occupancy pieces mentioned above, the one with the earliest CPE start position, Of the two available shared channel occupancy pieces mentioned above, this is the one with the latest CPE start position.

[0077] When selectively and specifically implemented, for a first transmission in which multiple channel occupancy information entries exist simultaneously, the CPE start position corresponding to the transmission resource of the first transmission is: Default 3rd CPE start position, One of the pre-configured CPE starting positions is randomly selected. CPE start position mapped to the CAPC level of the first transmission, CPE start position mapped to PPPP of the first transmission, Among multiple COTs, the CPE start position mapped to the CAPC level with the highest CAPC level, Among multiple COTs, the CPE start position mapped to the CAPC level with the lowest CAPC level, CPE start position mapped to the CAPC level of one shared channel occupancy information randomly selected from multiple COTs, Among multiple COTs, the CPE start position mapped to the PPPP value with the highest packet priority, Among multiple COTs, the CPE start position mapped to the PPPP value with the lowest packet priority, The CPE start position is mapped to the PPPP value of one shared channel occupancy information randomly selected from multiple COTs. Among multiple COTs, the CPE start position is indicated by the shared channel occupancy information with the highest CAPC level. Among multiple COTs, the CPE start position is indicated by the shared channel occupancy information with the lowest CAPC level. Among multiple COTs, the CPE start position is indicated by the shared channel occupancy information with the highest packet priority. Among multiple COTs, the CPE start position is indicated by the shared channel occupancy information with the lowest packet priority. The CPE start position is indicated by one shared channel occupancy information randomly selected from multiple COTs. Among multiple COTs, the CPE start position indicated by the shared channel occupancy information that has the earliest CPE start position, It includes one of the COTs, specifically the CPE start position indicated by the shared channel occupancy information with the latest CPE start position.

[0078] In the above embodiment, if multiple COTs are available, one target COT can be determined based on rules regarding CAPC level, packet priority (PPPP), etc., and the starting position of the CPE can be determined based on the target COT.

[0079] Case 4 The first transmission belongs to continuous multi-slot transmission (MCSt).

[0080] In Embodiment 1, if the first transmission in step 101 belongs to continuous multi-slot transmission, the CPE start position corresponding to the transmission resource of the first transmission is: Default 1st CPE start position, One of the pre-configured CPE starting positions is randomly selected. The CPE start position mapped to the channel access priority class CAPC level of the first transmission, The CPE start position mapped to the priority PPPP for each proximity-based service packet of the first transmission, The end position of the PSCCH transmission in the previous slot, The end position of the PSSCH transmission in the previous slot, The end position of the physical sidelink feedback channel PSFCH transmission in the previous slot, A position where the interval between this position and the end position of the PSCCH transmission of the previous slot is less than or equal to the first value, A position where the interval between this position and the end position of the PSSCH transmission of the previous slot is less than or equal to the second value, This includes any of the following positions: one where the interval between this position and the end position of the PSFCH transmission in the previous slot is less than or equal to the third value.

[0081] In Embodiment 2, if the first transmission in step 101 belongs to continuous multi-slot transmission, the CPE start position corresponding to the transmission resource of the first transmission is: Default second CPE start position, One of the pre-configured CPE starting positions is randomly selected. The CPE start position mapped to the CAPC level of the first transmission, The CPE start position mapped to PPPP of the first transmission, The CPE start position mapped to the CAPC level of the second transmission, which is the transmission of the second terminal that initiates shared channel occupancy. The CPE start position mapped to PPPP of the second transmission, The CPE start position indicated by the shared channel occupancy information, The end position of the PSCCH transmission in the previous slot, The end position of the PSSCH transmission in the previous slot, The end position of the physical sidelink feedback channel PSFCH transmission in the previous slot, A position where the interval between this position and the end position of the PSCCH transmission of the previous slot is less than or equal to the first value, A position where the interval between this position and the end position of the PSSCH transmission of the previous slot is less than or equal to the second value, This includes any of the following positions: one where the interval between this position and the end position of the PSFCH transmission in the previous slot is less than or equal to the third value.

[0082] In Embodiment 3, if the first transmission in step 101 belongs to continuous multi-slot transmission, the CPE start position corresponding to the transmission resource of the first transmission is: Default 3rd CPE start position, One of the pre-configured CPE starting positions is randomly selected. The CPE start position mapped to the CAPC level of the first transmission, The CPE start position mapped to PPPP of the first transmission, CPE start position mapped to the CAPC level of target shared channel occupancy information, The CPE start position mapped to PPPP in the aforementioned target shared channel occupancy information, The CPE start position indicated by the aforementioned target shared channel occupancy information, The end position of the PSCCH transmission in the previous slot, The end position of the PSSCH transmission in the previous slot, The end position of the physical sidelink feedback channel PSFCH transmission in the previous slot, A position where the interval between this position and the end position of the PSCCH transmission of the previous slot is less than or equal to the first value, A position where the interval between this position and the end position of the PSSCH transmission of the previous slot is less than or equal to the second value, This includes any of the following positions: one where the interval between this position and the end position of the PSFCH transmission in the previous slot is less than or equal to the third value.

[0083] Of these, the aforementioned target shared channel occupancy information is One of the at least two available shared channel occupancy pieces of information is randomly selected from the above, Of the two available shared channel occupancy pieces mentioned above, the one with the highest PPPP value, Of the two available shared channel occupancy information items mentioned above, the one with the lowest PPPP value, Of the two available shared channel occupancy pieces mentioned above, the one with the highest CAPC level, Of the two available shared channel occupancy pieces mentioned above, the one with the lowest CAPC level, Of the two available shared channel occupancy pieces mentioned above, the one with the earliest CPE start position, Of the two available shared channel occupancy pieces mentioned above, this is the one with the latest CPE start position.

[0084] In Embodiment 4, if the first transmission in step 101 belongs to continuous multi-slot transmission, the CPE start position corresponding to the transmission resource of the first transmission is: The end position of the PSCCH transmission in the previous slot, The end position of the PSSCH transmission in the previous slot, The end position of the physical sidelink feedback channel PSFCH transmission in the previous slot, A position where the interval between this position and the end position of the PSCCH transmission of the previous slot is less than or equal to the first value, A position where the interval between this position and the end position of the PSSCH transmission of the previous slot is less than or equal to the second value, This includes any of the following positions: one where the interval between this position and the end position of the PSFCH transmission in the previous slot is less than or equal to the third value.

[0085] Furthermore, in the case of continuous multi-slot transmission, if it is necessary to ensure as much as possible that there is no interruption between multiple consecutive slots, the starting position of the CPE can be determined by the following method.

[0086] For example, for the transmission of the first slot of MCSt, the CPE start position can be determined by any one of embodiments 1 to 4, and for subsequent transmissions, it is determined whether the CPE start position is the PSCCH / PSSCH end position of the previous slot, or whether the interval between the CPE start position and the PSCCH / PSSCH end position of the previous slot is 16us or less, thereby ensuring as much as possible that there is no interruption between consecutive slots.

[0087] For example, the CPE start position may be determined according to Embodiment 4 for each slot transmission of MCSt, that is, the start position of the CPE is determined to be either the end position of the PSCCH / PSSCH of the previous slot, or the interval between the start position of the CPE and the end position of the PSCCH / PSSCH of the previous slot is 16us or less, thereby ensuring as much as possible that there is no interruption between multiple consecutive slots.

[0088] For example, as shown in Figure 6, if the UE's current PSCCH / PSSCH transmission is an MCSt transmission, the UE determines the CPE start position for the first slot based on the CAPC level of the current transmission (for example, CAPC=2 as shown in Figure 6), and to ensure continuity for subsequent slot transmissions, the UE determines the CPE start position as the position where the PSCCH / PSSCH transmission of the previous slot ended.

[0089] Furthermore, if it is not necessary to guarantee that there will be no interruption between consecutive slots, the CPE start position may be determined for each slot transmission of the MCSt using one of the embodiments 1 to 3.

[0090] Furthermore, selectively, in embodiments 1 to 4 described above, the first, second, and third values ​​may be 16us.

[0091] Selectively, in embodiments 1 to 4 described above, the default first CPE start position, second CPE start position, and third CPE start position are fixed CPE start positions set by the upper layer or pre-configured, and the first CPE start position, second CPE start position, and third CPE start position may be the same or different from each other.

[0092] In one embodiment, the target transmission resource includes the currently determined transmission resource or a transmission resource determined based on the re-evaluation results.

[0093] The determined transmission resources include at least one of the following: periodically reserved resources, retransmission resources reserved at the time of initial transmission, non-periodically selected resources, and randomly selected resources.

[0094] The following describes an example of resource re-evaluation.

[0095] In one embodiment, if the target transmission resource is a transmission resource determined based on the re-evaluation result, the method for performing resource re-evaluation is: If the determined transmission resource for the first transmission is not located within the first target COT, a resource re-evaluation is performed on the determined transmission resource for the first transmission, wherein the first target COT includes at least one available COT, the COT with the highest CAPC level among multiple available COTs, the COT with the lowest PPPP value among multiple available COTs, or the COT with the earliest CPE start position among multiple available COTs. This includes determining the target transmission resources based on the resource re-evaluation results.

[0096] The time at which resource re-evaluation is performed for the determined transmission resources of the first transmission may be any time between the receipt of shared channel occupancy information and the current determined transmission resources.

[0097] Furthermore, in one embodiment, determining the target transmission resource based on the resource re-evaluation results is, If, based on the resource re-evaluation results, it is determined that there are available resources within the first target COT, a resource re-selection within the first target COT is triggered to determine the target transmission resource, or If, based on the resource re-evaluation results, it is determined that there are no available resources within the first target COT, To determine the currently determined transmission resource as the target transmission resource, In order of increasing CAPC level, a first COT containing available resources is selected from the multiple available COTs, a resource re-selection is triggered within the first COT, and the target transmission resource is determined. In order of PPPP priority, a second COT containing available resources is selected from the multiple available COTs, a resource reselection is triggered within the second COT, and the target transmission resource is determined. This includes performing one of the following: selecting a third COT from the plurality of available COTs in order from front to back of the CPE start position, where available resources exist; triggering resource re-selection within the third COT; and determining the target transmission resource.

[0098] For example, if the first target COT includes at least one available COT, the resource reassessment step may include the following:

[0099] In step 1, determine whether the currently determined transmission resource is located within at least one COT; if so, perform step 2; otherwise, perform step 3.

[0100] In step 2, the starting position of the CPE is determined based on one of the embodiments described in cases 1 to 4 above, and the current transmission is executed.

[0101] Here, the CPE start position is related to the COT where the current transmission is located, and is, for example, the CPE start position mapped to the CAPC level of the COT where the current transmission is located.

[0102] In step 3, a resource reassessment is performed to determine a new candidate set of resources, and it is determined whether there are available transmission resources within the COT in the new candidate set. If so, step 4 is performed; otherwise, step 5 is performed.

[0103] In step 4, trigger resource re-selection and select the target transmission resource from the resources located within the COT in the new set of candidate resources.

[0104] In step 5, the currently determined transmission resource is designated as the target transmission resource.

[0105] In the above example, for transmissions without available shared channel occupancy information, the terminal can only perform the Type 1 channel access method, which can lead to slow channel access, inability to guarantee that access will be completed before the selected resource is reached, and potential packet loss. In the above embodiment, by positioning the transmission resource within at least one available COT, channel access efficiency and packet transmission reliability can be effectively improved.

[0106] Furthermore, if there are multiple COTs available on the terminal, one of them may be selected, for example, the COT with the highest CAPC level or the COT with the lowest PPPP value, and the transmission resources may be placed within it, thereby ensuring reliable data transmission.

[0107] For example, the terminal may perform the following steps:

[0108] In step 1, it is determined whether the currently determined transmission resource is located within the highest COT at the CAPC level. If so, step 2 is performed; otherwise, step 3 is performed.

[0109] In step 2, the starting position of the CPE is determined, and the current transmission is executed.

[0110] Here, the CPE start position is related to the COT where the current transmission is located, and is, for example, the CPE start position mapped to the CAPC level of the COT where the current transmission is located.

[0111] In step 3, a resource reassessment is performed to determine a new candidate resource set, and it is determined whether the available transmission resources within the COT with the highest CAPC level are present in the new candidate resource set. If so, step 4 is performed; otherwise, step 5 is performed.

[0112] In step 4, a resource re-selection is triggered, and the target transmission resource is selected from the new set of candidate resources, specifically from the resources located within the COT with the highest CAPC level.

[0113] In step 5, it is determined whether the currently determined transmission resource is located in the next highest COT level after the CAPC level. Steps 3-5 are repeated until a target transmission resource can be re-selected within the COT. If, even after traversing to the COT with the lowest CAPC, no available transmission resources are found within the COT, then step 6 is performed.

[0114] In step 6, the currently determined transmission resource is selected as the target transmission resource.

[0115] Exemplary, as shown in Figure 7, UE3's transmission includes two available COTs: COT1 is initiated by UE1 and has a CAPC level of 1, and COT2 is initiated by UE2 and has a CAPC level of 2. If UE3 determines that a determined transmission resource (e.g., a reserved resource) is not located in the COT with the highest CAPC level, it performs a resource reassessment to determine if there are any available transmission resources in COT1. If it determines that there are available transmission resources in COT1, UE3 triggers a resource reselection and reselects the target transmission resource from the available resources in COT1.

[0116] In the above embodiment, the method for determining the CPE start position before transmission by a sidelink terminal operating on an unlicensed spectrum is defined, and the method for handling cases where multiple shared channel occupancy information is available to the terminal simultaneously is considered. This ensures fairness in sidelink channel access and improves the reliability of transmission by sidelink terminals on an unlicensed spectrum, making it more suitable for transmission by sidelink terminals operating on an unlicensed spectrum.

[0117] Second Example As shown in Figure 8, an embodiment of the present invention provides an apparatus 800 for determining cyclic prefix extension applied to a first terminal, the apparatus, Includes a first determination module used to determine the cyclic prefix extension CPE start position corresponding to the target transmission resource of the first transmission, based on the transmission type information that the first transmission satisfies. Of these, the transmission type information is It belongs to a transmission after the first channel access type. It belongs to transmission after the second channel access type. No information is available regarding the use of available shared channels. There must be one available shared channel reservation. There must be at least two available shared channel occupancy records. This includes at least one of the following: belonging to continuous multi-slot transmission.

[0118] Selectively, the first decision module is: If the first transmission is a transmission following a first channel access type and / or if there is no shared channel occupancy information available for the first transmission, the CPE start position corresponding to the transmission resource of the first transmission is set. Default 1st CPE start position, One of the pre-configured CPE starting positions is randomly selected. The CPE start position mapped to the channel access priority class CAPC level of the first transmission, It includes a first determination submodule configured to determine one of the following CPE start positions mapped to the priority PPPP per proximity-based service packet of the first transmission.

[0119] Selectively, the first decision module is: If the first transmission is a transmission following the second channel access type and / or there is one shared channel occupancy available for the first transmission, the CPE start position corresponding to the transmission resource of the first transmission is set Default second CPE start position, One of the pre-configured CPE starting positions is randomly selected. The CPE start position mapped to the CAPC level of the first transmission, The CPE start position mapped to PPPP of the first transmission, The CPE start position mapped to the CAPC level for the second transmission, which is the transmission from the second terminal that initiates shared channel occupancy. The CPE start position mapped to PPPP of the second transmission, It includes a second determination submodule configured to determine one of the CPE start positions indicated by the shared channel occupancy information.

[0120] Selectively, the first decision module is: If there are at least two shared channel occupancy information available for the first transmission, the CPE start position corresponding to the transmission resource of the first transmission is set as follows: Default 3rd CPE start position, One of the pre-configured CPE starting positions is randomly selected. The CPE start position mapped to the CAPC level of the first transmission, The CPE start position mapped to PPPP of the first transmission, CPE start position mapped to the CAPC level of target shared channel occupancy information, The CPE start position mapped to PPPP in the aforementioned target shared channel occupancy information, It includes a third decision submodule configured to determine one of the CPE start positions indicated by the aforementioned target shared channel occupancy information, Of these, the aforementioned target shared channel occupancy information is One of the at least two available shared channel occupancy pieces of information is randomly selected from the above, Of the two available shared channel occupancy pieces mentioned above, the one with the highest PPPP value, Of the two available shared channel occupancy information items mentioned above, the one with the lowest PPPP value, Of the two available shared channel occupancy pieces mentioned above, the one with the highest CAPC level, Of the two available shared channel occupancy pieces mentioned above, the one with the lowest CAPC level, Of the two available shared channel occupancy pieces mentioned above, the one with the earliest CPE start position, Of the two available shared channel occupancy pieces mentioned above, this is the one with the latest CPE start position.

[0121] Selectively, the first transmission is Current physical sidelink control channel PSCCH transmission, Current physical sidelink shared channel PSSCH transmission, Transmission of any one slot in continuous multi-slot transmission, This includes at least one of the following: transmission of the first slot in continuous multi-slot transmission.

[0122] If the first transmission is selectively a continuous multi-slot transmission, the CPE start position corresponding to the transmission resource of the first transmission is: The end position of the PSCCH transmission in the previous slot, The end position of the PSSCH transmission in the previous slot, The end position of the physical sidelink feedback channel PSFCH transmission in the previous slot, A position where the interval between this position and the end position of the PSCCH transmission of the previous slot is less than or equal to the first value, A position where the interval between this position and the end position of the PSSCH transmission of the previous slot is less than or equal to the second value, The position further includes at least one of the positions where the interval between it and the end position of the PSFCH transmission of the previous slot is less than or equal to the third value.

[0123] Selectively, the target transmission resource may include the currently determined transmission resource or a transmission resource determined based on the re-evaluation results.

[0124] Selectively, the device 800, A re-evaluation module configured to perform a resource re-evaluation on the determined transmission resource for the first transmission if the determined transmission resource for the first transmission is not located within the first target COT, wherein the first target COT includes at least one available COT, the COT with the highest CAPC level among multiple available COTs, the COT with the lowest PPPP value among multiple available COTs, or the COT with the earliest CPE start position among multiple available COTs, The system further includes a second decision module configured to determine the target transmission resource based on the resource re-evaluation results.

[0125] Selectively, the second decision module is: If it is determined that there are available resources within the first target COT based on the resource re-evaluation results, a fourth decision submodule is configured to trigger resource re-selection within the first target COT and determine the target transmission resource, or If, based on the resource re-evaluation results, it is determined that there are no available resources within the first target COT, To determine the currently determined transmission resource as the target transmission resource, In order of increasing CAPC level, the system selects a first COT from the multiple available COTs where available resources exist, triggers resource re-selection within the first COT, and determines the target transmission resource. In order of PPPP priority, select a second COT from the multiple available COTs where available resources exist, trigger resource re-selection within the second COT, and determine the target transmission resource. The system includes a fifth decision submodule configured to perform one of the following actions: selecting a third COT from the plurality of available COTs in order from front to back of the CPE start position, where available resources exist; triggering resource re-selection within the third COT; and determining the target transmission resource.

[0126] A second embodiment of the present invention corresponds to the method of the first embodiment, and all the implementing means in the first embodiment can be applied to an embodiment of the apparatus for determining the cyclic prefix extension, and the same technical effects can be achieved.

[0127] Third Example To better achieve the above objective, as shown in Figure 9, a third embodiment of the present invention further provides a first terminal, which is: It includes a processor 900 and a memory 920 connected to the processor 900 via a bus interface, The memory 920 is configured to store programs and data used by the processor 900 when it performs operations. The processor 900 retrieves and executes the programs and data stored in the memory 920.

[0128] Of these, the transceiver 910 is connected to the bus interface and configured to send and receive data under the control of the processor 900. Processor 900 reads the program in memory 920, It is configured to perform the step of determining the cyclic prefix extension CPE start position corresponding to the target transmission resource of the first transmission based on the transmission type information that the first transmission satisfies, Of these, the transmission type information is It belongs to a transmission after the first channel access type. It belongs to transmission after the second channel access type. No information is available regarding the use of available shared channels. There must be one available shared channel reservation. There must be at least two available shared channel occupancy records. This includes at least one of the following: belonging to continuous multi-slot transmission.

[0129] In Figure 9, the bus architecture may include any number of interconnected buses and bridges, specifically, one or more processors, including the processor 900, and various memory circuits, including the memory 920, are connected together. The bus architecture may also connect various other circuits, such as peripherals, voltage stabilizers, and power management circuits, all of which are well known in the art and will not be further described in this paper. The bus interface provides an interface. The transceiver 910 may consist of multiple components, namely a transmitter and a transceiver, and provides a unit used to communicate with various other devices over a transmission medium. For different terminals, the user interface 930 may be an interface that can be connected externally or internally to the necessary equipment, and the connected equipment may include, but is not limited to, a numeric keypad, display, speaker, microphone, joystick, etc. The processor 900 is responsible for managing the bus architecture and normal processing, and the memory 920 can store data used by the processor 900 when performing operations.

[0130] Selectively, the processor 900 reads a program from memory 920, If the first transmission is a transmission following a first channel access type and / or if there is no shared channel occupancy information available for the first transmission, the CPE start position corresponding to the transmission resource of the first transmission is set. Default 1st CPE start position, One of the pre-configured CPE starting positions is randomly selected. The CPE start position mapped to the channel access priority class CAPC level of the first transmission, It is configured to implement the step of determining the CPE start position as one of the CPE start positions mapped to the priority PPPP per proximity-based service packet of the first transmission.

[0131] Selectively, the processor 900 reads a program from memory 920, If the first transmission is a transmission following the second channel access type and / or there is one shared channel occupancy available for the first transmission, the CPE start position corresponding to the transmission resource of the first transmission is set Default second CPE start position, One of the pre-configured CPE starting positions is randomly selected. The CPE start position mapped to the CAPC level of the first transmission, The CPE start position mapped to PPPP of the first transmission, The CPE start position mapped to the CAPC level for the second transmission, which is the transmission from the second terminal that initiates shared channel occupancy. The CPE start position mapped to PPPP of the second transmission, The system is configured to perform the step of determining one of the CPE start positions indicated by the shared channel occupancy information.

[0132] Selectively, the processor 900 is configured to read a program in memory 920 and perform the following steps:

[0133] If there are at least two shared channel occupancy information available for the first transmission, the CPE start position corresponding to the transmission resource of the first transmission is set as follows: Default 3rd CPE start position, One of the pre-configured CPE starting positions is randomly selected. The CPE start position mapped to the CAPC level of the first transmission, The CPE start position mapped to PPPP of the first transmission, CPE start position mapped to the CAPC level of target shared channel occupancy information, The CPE start position mapped to PPPP in the aforementioned target shared channel occupancy information, It is configured to be determined as one of the CPE start positions indicated by the aforementioned target shared channel occupancy information.

[0134] Of these, the aforementioned target shared channel occupancy information is One of the at least two available shared channel occupancy pieces of information is randomly selected from the above, Of the two available shared channel occupancy pieces mentioned above, the one with the highest PPPP value, Of the two available shared channel occupancy information items mentioned above, the one with the lowest PPPP value, Of the two available shared channel occupancy pieces mentioned above, the one with the highest CAPC level, Of the two available shared channel occupancy pieces mentioned above, the one with the lowest CAPC level, Of the two available shared channel occupancy pieces mentioned above, the one with the earliest CPE start position, Of the two available shared channel occupancy pieces mentioned above, this is the one with the latest CPE start position.

[0135] Selectively, the first transmission is Current physical sidelink control channel PSCCH transmission, Current physical sidelink shared channel PSSCH transmission, Transmission of any one slot in continuous multi-slot transmission, This includes at least one of the following: transmission of the first slot in continuous multi-slot transmission.

[0136] If the first transmission is selectively a continuous multi-slot transmission, the CPE start position corresponding to the transmission resource of the first transmission is: The end position of the PSCCH transmission in the previous slot, The end position of the PSSCH transmission in the previous slot, The end position of the physical sidelink feedback channel PSFCH transmission in the previous slot, A position where the interval between this position and the end position of the PSCCH transmission of the previous slot is less than or equal to the first value, A position where the interval between this position and the end position of the PSSCH transmission of the previous slot is less than or equal to the second value, The position further includes at least one of the positions where the interval between it and the end position of the PSFCH transmission of the previous slot is less than or equal to the third value.

[0137] Selectively, the target transmission resource may include the currently determined transmission resource or a transmission resource determined based on the re-evaluation results.

[0138] Selectively, the processor 900 reads a program from memory 920, If the determined transmission resources for the first transmission are not located within the first target COT, the step of performing a resource re-evaluation for the determined transmission resources for the first transmission, wherein the first target COT includes at least one available COT, the COT with the highest CAPC level among multiple available COTs, the COT with the lowest PPPP value among multiple available COTs, or the COT with the earliest CPE start position among multiple available COTs, The system is configured to perform the steps of determining the target transmission resources based on the resource re-evaluation results.

[0139] Selectively, the processor 900 reads a program from memory 920, If it is determined that there are available resources within the first target COT based on the resource re-evaluation results, the process involves triggering a resource re-selection within the first target COT and determining the target transmission resource, or If, based on the resource re-evaluation results, it is determined that there are no available resources within the first target COT, To determine the currently determined transmission resource as the target transmission resource, In order of increasing CAPC level, the system selects a first COT from the multiple available COTs where available resources exist, triggers resource re-selection within the first COT, and determines the target transmission resource. In order of PPPP priority, select a second COT from the multiple available COTs where available resources exist, trigger resource re-selection within the second COT, and determine the target transmission resource. The system is configured to perform one of the following steps: selecting a third COT from the multiple available COTs in order from front to back of the CPE start position, where available resources exist; triggering resource re-selection within the third COT; and determining the target transmission resource.

[0140] In an embodiment of the present invention, the CPE start position corresponding to the target transmission resource of the first transmission is determined based on the transmission type information satisfied by the first transmission, thereby providing a mechanism in which the terminal can specifically determine the CPE length itself without the cooperation of the base station, and ensuring that sidelink traffic in the unlicensed spectrum can be transmitted in a timely and reliable manner.

[0141] Those skilled in the art will understand that the steps of implementing all or part of the above embodiments may be completed by hardware or by instructing the relevant hardware with a computer program, the computer program including instructions for performing some or all of the steps of the above method, and the computer program may be stored in a readable storage medium, which may be any type of storage medium.

[0142] Furthermore, a specific embodiment of the present invention further provides a computer-readable storage medium in which a computer program is stored, and when the program is executed by a processor, the steps of the method in the first embodiment described above are realized. The same technical effects can be achieved, and to avoid duplication, the explanation is omitted here.

[0143] It goes without saying that in the apparatus and method of the present invention, each component or step is disassembled and / or reassembled. These disassembly and / or reassembly should be considered equivalent embodiments of the present invention. Furthermore, the steps for performing the series of processes described above may be performed naturally in chronological order, but do not necessarily have to be performed chronologically; some steps may be performed in parallel or independently of each other. As those skilled in the art will understand, all or any steps or components of the method and apparatus of the present invention may be implemented in hardware, firmware, software, or a combination thereof in any computing device (including processors, storage media, etc.) or network of computing devices. This can be implemented by those skilled in the art using their basic programming skills after reading the description of the present invention.

[0144] Therefore, the object of the present invention can be further realized by executing one program or a group of programs on any computing device. The computing device may be a well-known general-purpose device. Therefore, the object of the present invention may be realized simply by providing a program product containing program code that implements the method or apparatus. That is, such a program product also constitutes the present invention, and a storage medium on which such a program product is stored also constitutes the present invention. Needless to say, the storage medium may be any well-known storage medium or any storage medium developed in the future. In the apparatus and method of the present invention, each component or each step is, needless to say, disassembled and / or reassembled. These disassembly and / or reassembly should be considered equivalent embodiments of the present invention. Also, the steps that perform the above series of processes may be naturally performed in chronological order in the order described, but do not necessarily have to be performed in chronological order. Some steps may be performed in parallel or independently of each other.

[0145] The above are selective embodiments of the present invention, and those skilled in the art can make several improvements and modifications without departing from the principles described in the present invention, and these improvements and modifications should be considered within the scope of protection of the present invention.

Claims

1. A method for determining a cyclic prefix extension applied to a first terminal, This includes determining the cyclic prefix extension (CPE) start position corresponding to the target transmission resource of the first transmission based on the transmission type information that the first transmission satisfies, The aforementioned transmission type information is It belongs to the transmission after the first channel access type. It belongs to the transmission after the second channel access type. No information is available regarding the use of available shared channels. There must be one available shared channel reservation. There must be at least two available shared channel occupancy records, and Including at least one of the following: being a continuous multi-slot transmission, How to determine cyclic prefix extension.

2. Determining the CPE start position corresponding to the transmission resource of the first transmission based on the aforementioned transmission type information is: If the first transmission is a transmission after the first channel access type and / or there is no shared channel occupancy information available for the first transmission, the CPE start position corresponding to the transmission resource of the first transmission is set. Default first CPE start position, One of the pre-set CPE starting positions is randomly selected. The CPE start position mapped to the channel access priority class (CAPC) level of the first transmission, and This includes determining the CPE start position as one of the proximity-based service packet priority (PPPP) of the first transmission, A method for determining the cyclic prefix extension described in claim 1.

3. Determining the CPE start position corresponding to the transmission resource of the first transmission based on the aforementioned transmission type information is: If the first transmission is a transmission following the second channel access type and / or there is one shared channel occupancy piece available for the first transmission, the CPE start position corresponding to the transmission resource of the first transmission is set Default second CPE start position, One of the pre-set CPE starting positions is randomly selected. The CPE start position mapped to the CAPC level of the first transmission, The CPE start position mapped to the PPPP of the first transmission, The CPE start position mapped to the CAPC level of the second transmission, which is the transmission of the second terminal that initiates shared channel occupancy. The CPE start position mapped to the PPPP of the second transmission, and This includes determining the CPE start position as one of the CPE start positions indicated in the shared channel occupancy information, A method for determining the cyclic prefix extension described in claim 1.

4. Determining the CPE start position corresponding to the transmission resource of the first transmission based on the aforementioned transmission type information is: If there are at least two shared channel occupancy information available for the first transmission, the CPE start position corresponding to the transmission resource of the first transmission is set as follows: Default third CPE start position, One of the pre-set CPE starting positions is randomly selected. The CPE start position mapped to the CAPC level of the first transmission, The CPE start position mapped to the PPPP of the first transmission, CPE start position mapped to CAPC level of target shared channel occupancy information, The CPE start position mapped to the PPPP of the aforementioned target shared channel occupancy information, and This includes determining the CPE start position as one of the CPE start positions indicated by the target shared channel occupancy information, The aforementioned target shared channel occupancy information is, One of the at least two available shared channel occupancy pieces of information is randomly selected from the above, Of the two available shared channel occupancy pieces mentioned above, the one with the highest PPPP value, Of the two available shared channel occupancy pieces mentioned above, the one with the lowest PPPP value, Of the two available shared channel occupancy information items mentioned above, the one with the highest CAPC level, Of the two available shared channel occupancy information items mentioned above, the one with the lowest CAPC level, Of the two available shared channel occupancy pieces mentioned above, the one with the earliest CPE start position, and Of the at least two available shared channel occupancy pieces mentioned above, the one with the latest CPE start position is one of them. A method for determining the cyclic prefix extension described in claim 1.

5. The first transmission is Current Physical Sidelink Control Channel (PSCCH) transmission, Current physical sidelink shared channel (PSSCH) transmission, Transmission of any one slot in continuous multi-slot transmission, and, The transmission of the first slot in continuous multi-slot transmission, including at least one of the following: A method for determining cyclic prefix expansion according to any one of claims 2 to 4.

6. If the first transmission belongs to continuous multi-slot transmission, the CPE start position corresponding to the transmission resource of the first transmission is: The end position of the PSCCH transmission in the previous slot, The end position of the PSSCH transmission in the previous slot, The end position of the physical sidelink feedback channel (PSFCH) transmission in the previous slot, A position where the interval between this position and the end position of the PSCCH transmission of the previous slot is less than or equal to the first value. A position where the interval between the end position of the PSSCH transmission of the previous slot and the current position is less than or equal to the second value, and The position further includes at least one of the positions where the interval between it and the end position of the PSFCH transmission of the previous slot is less than or equal to the third value, A method for determining cyclic prefix extension according to any one of claims 1 to 4.

7. The aforementioned target transmission resources include currently determined transmission resources or transmission resources determined based on the re-evaluation results. A method for determining the cyclic prefix extension described in claim 1.

8. If the target transmission resource is a transmission resource determined based on the re-evaluation results, the method for performing the resource re-evaluation is: If the determined transmission resource for the first transmission is not located within the first target COT, a resource re-evaluation is performed for the determined transmission resource for the first transmission, wherein the first target COT includes at least one available COT, one of several available COTs with the highest CAPC level, one of several available COTs with the lowest PPPP value, or one of several available COTs with the earliest CPE start position. This includes determining the target transmission resources based on the resource re-evaluation results, A method for determining cyclic prefix expansion according to claim 7.

9. Determining the target transmission resources based on the resource re-evaluation results described above is: If it is determined that there are available resources within the first target COT based on the resource re-evaluation results, a resource re-selection within the first target COT is triggered to determine the target transmission resource, or If, based on the resource re-evaluation results, it is determined that there are no available resources within the first target COT, To determine the currently determined transmission resource as the target transmission resource, In order of increasing CAPC level, a first COT containing available resources is selected from the multiple available COTs, and a resource reselection is triggered within the first COT to determine the target transmission resource. In order of PPPP priority, a second COT containing available resources is selected from the multiple available COTs, and a resource re-selection is triggered within the second COT to determine the target transmission resource. The process includes, in order from front to back of the CPE start position, selecting a third COT from the plurality of available COTs where available resources exist, triggering resource re-selection within the third COT, and determining the target transmission resource, A method for determining cyclic prefix expansion according to claim 8.

10. The first terminal, It includes a transceiver, memory, a processor, and a computer program stored in memory and executable by the processor, When the processor executes the computer program, it implements the steps of the method for determining the cyclic prefix extension described in any one of claims 1 to 9. Terminal 1.

11. A device for determining cyclic prefix extension, which is applied to the first terminal, Includes a first determination module configured to determine the CPE start position corresponding to the target transmission resource of the first transmission based on the transmission type information that the first transmission satisfies, The aforementioned transmission type information is It belongs to the transmission after the first channel access type. It belongs to the transmission after the second channel access type. No information is available regarding the use of available shared channels. There must be one available shared channel reservation. There must be at least two available shared channel occupancy records. Including at least one of the following: belonging to continuous multi-slot transmission, A device that determines cyclic prefix expansion.

12. A computer program is stored there. When the computer program is executed by the processor, it implements the steps of a method for determining cyclic prefix extensions according to any one of claims 1 to 9. Computer-readable storage medium.

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