Sidelink resource determination method, device, and storage medium

Abstract

A sidelink resource determination method applied to a first node, comprising: determining (S710) a set of physical layer candidate time-frequency resources for a sidelink transmission opportunity from a sidelink resource pool based on system configuration information; and determining (S720) a physical layer time-frequency resource for a sidelink transmission opportunity from the set of physical layer candidate time-frequency resources, wherein the set of physical layer candidate time-frequency resources does not include a first resource that occupies L subchannels having consecutive indexes in the frequency domain, or includes a second resource that occupies L subchannels in the frequency domain and has at least one pair of adjacent subchannels that do not have consecutive indexes, or does not include a first resource that occupies L consecutive subchannels in the frequency domain and includes a second resource that occupies L subchannels in the frequency domain and has at least one pair of adjacent subchannels that do not have consecutive indexes, and L is an integer greater than or equal to 1. A sidelink resource determination method, device, and storage medium.

Description

[Technical Field]

[0001] The present application relates to the field of wireless communication, and to a sidelink resource determination method, device, and storage medium. [Background technology]

[0002] When a Sidelink Unlicensed (SL-U) device operates in an unlicensed spectrum, it must first determine a Sidelink (SL) resource pool in the unlicensed spectrum, where the SL-U resource pool includes N resource block sets (RB sets) and N-1 guard bands, where N is an integer greater than or equal to 1. Between each two adjacent RB sets, one guard band including multiple consecutive resource blocks (RBs) can be configured, pre-configured, or pre-defined by the system.

[0003] When selecting subchannels in the frequency domain range of the SL resource pool, some subchannels may include resources in the guard band. The 3rd Generation Partnership Project (3GPP) protocol specifies a resource usage condition in the guard band that requires a user equipment (UE) to simultaneously perform Listen Before Talk (LBT) on two RB sets adjacent to the guard band and simultaneously transmit on these two RB sets. However, when an SL-U device selects a transmission resource from the SL resource pool, the selected resource may not satisfy the resource usage condition in the guard band, and therefore the transmission of the selected transmission resource cannot be completed. In addition, in conventional New Radio (NR) SL, when selecting resources for data transmission, only resources of consecutive subchannels are generally considered. This is not a problem in a resource pool that transmits based on consecutive RBs, but in a resource pool that transmits based on interleaved RBs, candidate resources consisting of some subchannels that are not completely consecutive may also be used for data transmission. Therefore, if only the conventional resource selection method is considered, some opportunities to select usable resources may be missed, which may reduce the efficiency of sidelink communication. Summary of the Invention [Problem to be solved by the invention]

[0004] Embodiments of the present application provide a sidelink resource determination method, device, and storage medium.

[0005] An embodiment of the present application is a sidelink resource determination method applied to a first node, comprising: The method includes: determining a physical layer candidate time-frequency resource set for a sidelink transmission opportunity from a sidelink resource pool based on system configuration information; and determining physical layer time-frequency resources for the sidelink transmission opportunity from the physical layer candidate time-frequency resource set, wherein the physical layer candidate time-frequency resource set does not include a first resource occupying L subchannels with consecutive indices in the frequency domain, or includes a second resource occupying L subchannels in the frequency domain with at least one pair of adjacent subchannels that do not have consecutive indices, or does not include the first resource occupying L subchannels that are consecutive in the frequency domain, but includes a second resource occupying L subchannels in the frequency domain with at least one pair of adjacent subchannels that do not have consecutive indices, where L is an integer greater than or equal to 1.

[0006] The present application is directed to a memory configured to store a program; and a processor configured to execute the program, wherein, when the program is executed, the device determines, based on system configuration information, physical layer candidate time-frequency resource sets for sidelink transmission opportunities from a sidelink resource pool; and determines physical layer time-frequency resources for sidelink transmission opportunities from the physical layer candidate time-frequency resource set, wherein the physical layer candidate time-frequency resource set does not include a first resource occupying L subchannels having consecutive indices in the frequency domain, or includes a second resource occupying L subchannels in the frequency domain and having at least a pair of adjacent subchannels that do not have consecutive indices, or includes a second resource occupying L subchannels in the frequency domain and having at least a pair of adjacent subchannels that do not have consecutive indices, where L is an integer greater than or equal to 1.

[0007] The present application is directed to A non-volatile storage medium including a stored program, which, when executed, performs the sidelink resource determination method according to any one of claims 1 to 10, is provided. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram of the carrier frequency domain distribution of NR-U in an embodiment of the present application. [Figure 2] FIG. 1 is a schematic diagram of a communication scene between SL devices in an embodiment of the present application. [Figure 3] FIG. 2 is a schematic diagram of a resource configuration of an SL resource pool in an embodiment of the present application. [Figure 4] FIG. 2 is a schematic diagram of one SL resource pool in an embodiment of the present application. [Figure 5] FIG. 10 is a schematic diagram of another SL resource pool in an embodiment of the present application; [Figure 6] FIG. 1 is a schematic diagram of an SL resource pool based on interleaving in an embodiment of the present application; [Figure 7] 1 is a flowchart of a sidelink resource determination method according to an embodiment of the present application; [Figure 8] FIG. 2 is a schematic diagram of one first resource in an embodiment of the present application; [Figure 9] FIG. 10 is a schematic diagram of another first resource in an embodiment of the present application; [Figure 10] FIG. 1 is a structural schematic diagram of a sidelink resource determination device according to an embodiment of the present application; [Figure 11] FIG. 2 is a structural schematic diagram of a sidelink resource determination device according to an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0010] In 5G NR-U (5th Generation New Radio in Unlicensed Spectrum), M consecutive interleaved RBs are defined by a carrier, and the interleaved RBs are distributed at equal intervals. Different interleaves are distributed in a comb-like pattern in the frequency domain, numbered 0 to M-1. Furthermore, N consecutive RB sets are defined in the frequency domain, numbered 0 to N-1. As shown in Figure 1, Figure 1 is a schematic diagram of the carrier frequency domain distribution of NR-U. When indicating data resources, NR-U adopts a two-stage indication scheme of X+Y, where X represents the interleave used for Physical Uplink Shared Channel (PUSCH) resources and Y represents the consecutive RB set used for PUSCH resources. Thus, the UE can determine the frequency domain resource location of data within a Bandwidth Part (BWP) based on the indication information. The smallest indication unit in the frequency domain is all of the physical RB resources in one RB set in one interleave.

[0011] SL devices communicate based on resources in the SL resource pool without the need for data transfer by the base station. Figure 2 is a schematic diagram of a communication scene between SL devices. In Figure 2, SL communication is performed between UE1 and UE2 using resources in the SL resource pool without the need for scheduling or data transfer by the base station.

[0012] The smallest unit of data scheduling in the SL resource pool is a subchannel, which may also be referred to as a subchannel. In 3GPP Version (Rel)-16 / Rel-17, the SL resource pool consists of W consecutive subchannels in the frequency domain based on system configuration, pre-configured information, or pre-definition. Generally, one piece of data occupies a number of consecutive subchannels, and one subchannel includes a number of consecutive RBs determined based on system configuration or pre-configured information. Figure 3 is a schematic diagram of the resource configuration of the SL resource pool. As shown in Figure 3, the BWP of the SL resource pool includes a total of W consecutive subchannels, subchannel 0 to subchannel W-1.

[0013] When resource indication is performed after determining the SL resource pool, the resource location of the SL data can be determined by simply indicating the starting position of the subchannel to be occupied in the frequency domain of the data and the number of subchannels to be used, and at least one subchannel is used for data transmission. After determining the frequency domain location of its own data, the UE indicates frequency domain information of one or more Physical Sidelink Shared Channel (PSSCH) resources reserved in the SCI using Frequency Resource Indication Value (FRIV) indication information in the Sidelink Control Information (SCI).

[0014] 3GPP Rel-18 supports continuous RB transmission such as R-16 / R-17 for SL-U, while supporting data transmission based on interleaved RBs such as NR-U. The SL resource pool includes an integer number of RB sets, which also means that subchannels, the minimum resource allocation granularity in the SL resource pool, may be contiguous RBs. Figures 4 and 5 are schematic diagrams of two different SL resource pools. In Figures 4 and 5, RB set 0 and RB set 1 are two adjacent RB sets, and the RBs between RB set 0 and RB set 1 belong to a guard band. The RBs within the guard band may be defined as resources in the subchannels of the SL resource pool, or may be used only for rate matching. Figures 4 and 5 also show that the RBs within the guard band are defined as subchannels of the SL resource pool. Note that Figure 4 and Figure 5 differ in that the subchannels in the SL resource pool are contiguous in Figure 4, while the starting positions of all subchannels in each RB set are aligned with the starting positions of the RB sets in Figure 5.

[0015] A subchannel may be composed of interleaved RBs, and FIG. 6 is a schematic diagram of an SL resource pool based on interleaving, where Sc in FIG. 6 represents a subchannel.

[0016] Although the physical resources required for a transmission opportunity for an SL-U device are typically L subchannels in the frequency domain, there are guard bands between RB sets in the frequency domain in the SL resource pool, which limits the use of the guard bands. Furthermore, for interleaved transmission, there may be restrictions on matching interleaving between different RB sets in NR. Therefore, L subchannels with consecutive indices corresponding to one transmission opportunity for an SL-U device may not be available. Therefore, the SL-U device must consider these factors when selecting time-frequency resources for a transmission opportunity.

[0017] FIG. 7 is a flowchart of a sidelink resource determination method according to an embodiment of the present application. As shown in FIG. 7, the sidelink resource determination method according to an embodiment of the present application includes the following steps:

[0018] In step 710, a physical layer candidate time-frequency resource set for a sidelink transmission opportunity is determined from the sidelink resource pool based on the system configuration information.

[0019] The physical layer candidate time-frequency resource set does not include a first resource occupying L subchannels with consecutive indices in the frequency domain, or includes a second resource occupying L subchannels in the frequency domain with at least one pair of adjacent subchannels that do not have consecutive indices, or does not include a first resource occupying L subchannels that are consecutive in the frequency domain, and includes a second resource occupying L subchannels in the frequency domain with at least one pair of adjacent subchannels that do not have consecutive indices, where L is an integer greater than or equal to 1.

[0020] In an SL-U system, devices operating in unlicensed bands also operate based on an SL resource pool, which includes N subchannels with consecutive numbers. A subchannel is typically considered the smallest scheduling and instruction unit for SL data transmission. SL-U transmission supports two modes: transmission based on continuous RBs and transmission based on interleaved RBs. When configured for transmission based on continuous RBs, the RB resources included in the subchannel are also continuous RBs in the SL resource pool. When the SL resource pool is configured for transmission based on interleaving, the subchannel also consists of interleaved RBs. Regardless of the mode, ultimately, when resource selection is performed for one UE, it can be unified and abstracted into the mode shown in Figure 3.

[0021] When selecting resources from the SL resource pool, the UE determines L subchannels from the SL resource pool as physical transmission resources for the sidelink shared channel according to instructions from a higher layer or a physical layer. Here, in mode 1, the UE directly determines L subchannels from the SL resource pool according to instructions from the base station, while in mode 2, the UE needs to perform sensing within a resource selection window or random resource selection to select one suitable physical transmission resource for the sidelink shared channel including L subchannels.

[0022] When the UE performs sensing-based resource selection, it selects candidate resources R x,y After determining the required candidate resources and reporting the set of candidate resources that meet the requirements to the higher layer, the higher layer must determine the final PSSCH time-frequency resources. The candidate resource set mechanism is determined according to the SL mode2 UE, i.e., L consecutive subchannels from the starting subchannel are selected as candidate resources for one single slot. By continuing to use this mechanism, some candidate resources in the SL resource pool are unavailable in the resource selection window, and some additional candidate resources are available but cannot be determined according to the conventional mechanism. To more effectively determine candidate resources when the UE selects resources, it is necessary to consider the handling of unavailable candidate resources and additional candidate resources. When the UE selects resources based on random selection, its Media Access Control (MAC) layer randomly selects resources from the candidate resource set instructed by the physical layer. The final time-frequency resource determination also needs to consider the handling of unavailable candidate resources and additional candidate resources.

[0023] Therefore, this embodiment provides a sidelink resource determination method applicable to a first node, which may be a UE or a network device that needs to perform uplink data transmission using SL resources in a network. First, the method determines a physical layer candidate time-frequency resource set for a sidelink transmission opportunity from a sidelink resource pool based on system configuration information. The physical layer candidate time-frequency resource set is a set of physical layer selectable time-frequency resources for sidelink transmission in the first node, and each candidate time-frequency resource set may include multiple contiguous RBs, one or multiple interleaved RBs, or multiple subchannels serving as scheduling units.

[0024] Determining the physical layer candidate time-frequency resources based on the system configuration information includes determining the physical layer candidate time-frequency resources in a system configuration, or pre-configuration, or pre-defined manner, where the system configuration, which may also be called a configuration, is usually from a network side or a base station and is transmitted from the network side or the base station to the first node in a signaling manner, and the pre-configuration is usually a configuration provided to an upper layer of the first node itself or another upper layer entity, such as another network entity, or pre-defining the configuration information of the physical layer candidate time-frequency resources in the first node.

[0025] A conventional SL resource pool includes multiple consecutive RB sets and guard bands between adjacent RB sets. As a result, when a UE selects transmission resources from the SL resource pool, it may select RBs within the guard bands. However, in some cases, RBs within the guard bands cannot be used. To solve the above problem, in this embodiment, a physical layer candidate time-frequency resource set for sidelink transmission opportunities is first determined in a sidelink resource pool (i.e., SL resource pool) based on system configuration information. The physical layer candidate time-frequency resource set does not include a first resource, or includes a second resource, or does not include the first resource and includes the second resource. The first resource is a candidate resource that needs to be excluded from the sidelink resource pool, and the second resource is an additional candidate resource that indicates availability for sidelink transmission. Both the first resource and the second resource include L subchannels, where L is an integer greater than or equal to 1.

[0026] Regarding the determination of the physical layer candidate time-frequency resource set for a sidelink transmission opportunity from the sidelink resource pool, there are three cases:

[0027] 1) The physical layer candidate time-frequency resource set does not include a first resource occupying L subchannels with consecutive indices in the frequency domain, and the first resource may be characterized in that each of the L subchannels with consecutive indices occupied in the frequency domain includes RBs with multiple consecutive indices, or may include one or more interleaved RBs in one or more sets of consecutive RBs. For example, in the SL resource pool shown in FIG. 3, the first resource may include subchannel 1 and subchannel 2, or may include subchannel 2, subchannel 3, and subchannel 4. Thus, when selecting physical layer time-frequency resources for sidelink transmission opportunities, the first resource is not selected.

[0028] 2) The physical layer candidate time-frequency resource set includes a second resource occupying L subchannels in the frequency domain and having at least one pair of adjacent subchannels that do not have consecutive indices. While conventional SL resource selection can only select consecutive subchannels in the frequency domain, the present embodiment can additionally specify a second resource whose subchannel indices are not completely consecutive. The second resource is also a resource occupying L subchannels in the frequency domain, and has at least one pair of adjacent subchannels that do not have consecutive indices. For example, in the SL resource pool shown in FIG. 3, conventional resource selection can only select multiple subchannels with consecutive indices, such as subchannel0, subchannel1, and subchannel2, or subchannel1, subchannel2, and subchannel3. In contrast, in the present embodiment, the second resource can consist of subchannel0, subchannel1, and subchannel3, where subchannel0 and subchannel1 have consecutive indices and subchannel1 and subchannel3 have discontinuous indices. In this way, when selecting a physical layer time-frequency resource for a sidelink transmission opportunity, the second resource can be selected.

[0029] 3) The physical layer candidate time-frequency resource set does not include a first resource occupying L consecutive subchannels in the frequency domain, and the physical layer candidate time-frequency resource set includes a second resource occupying L subchannels in the frequency domain and having at least one pair of adjacent subchannels that do not have consecutive indices. This method corresponds to a combination of the above-mentioned methods 1) and 2), in which the first resource is first excluded from the candidate resources in the sidelink resource pool, or the initialized candidate resource set, or the candidate resource set that needs to be reported after MAC layer or physical layer sensing is completed, and then the second resource is added. Therefore, when selecting a physical layer time-frequency resource for a sidelink transmission opportunity, the selection range is larger, and the first resource cannot be selected, but the second resource can be selected.

[0030] The characteristics of the first resource will be explained below.

[0031] The first resource can have one of the following characteristics: a) to m).

[0032] a) The index of the first resource block RB in the first subchannel among the L subchannels having consecutive indices is greater than or equal to the first RB index in the nth RB set and less than or equal to the index of the first RB in the n+1th RB set.

[0033] 8 is a schematic diagram of a first resource in an embodiment of the present application, taking subchannels transmitted based on consecutive RBs as an example. As shown in FIG. 8, the first resource includes a total of L subchannels, i.e., Sc m, Sc m+1, Sc m+2, . . . , Sc m+L-1. The index of the first RB in the first subchannel of the first resource (i.e., Sc m) is equal to or greater than the first RB index in the nth RB set (RB set0 in the figure). The index of the first RB in the first subchannel is equal to or less than the index of the first RB in the n+1th RB set (RB set1 in the figure). Each RB set includes multiple RBs, and the indexes of the RBs are arranged in descending order, and the indexes of RBs in adjacent RB sets are also arranged in descending order. In this way, the starting RB in the starting subchannel of the first resource is located after the first position, which is the position of the first RB in RB set0 in FIG. 8. That is, the index of the starting RB in the starting subchannel of the first resource may be equal to or greater than the first RB index in RB set0. The starting RB in the starting subchannel of the first resource may be before the starting RB in RB set1, i.e., the index of the starting RB in the starting subchannel of the first resource may be equal to or less than the index of the first RB in RB set1. The range from the first position to the start position of RB set1 in the figure is the range of the starting RB in the starting subchannel of the first resource. The L subchannels starting from the range of the starting RB of the first resource are the first resource. By setting the starting RB in the starting subchannel of the first resource, i.e., the starting point of the first subchannel, it is possible to avoid selecting a guard band and only resources in one RB set for the selected physical layer time-frequency resource.

[0034] b) The first RB in the first subchannel of the L subchannels with consecutive indices is within the guard band.

[0035] This also restricts the starting point of the first resource, and indicates that the starting point of the first resource is within the guard band if the first RB in the first subchannel of the first resource is within the guard band. The first resource configured in this way can avoid selecting only resources in one RB set adjacent to the guard band for the selected physical layer time-frequency resource.

[0036] c) The first subchannel of the L subchannels with consecutive indices includes RBs within the guard band.

[0037] Depending on the system configuration and usage environment, in some transmission scenarios, the use of resources within the guard band in sidelink transmission may affect transmission. Therefore, the first resource may be L consecutive subchannels whose first subchannel includes RBs within the guard band, i.e., as long as the first subchannel includes RBs within the guard band, it belongs to the excluded resources.

[0038] d) The number of RBs in the guard band included in the first subchannel of the L subchannels with consecutive indices exceeds a first threshold.

[0039] In this case, it is determined that the L consecutive subchannels are the first resource and need to be excluded only if the number of RBs in the guard band included in the first subchannel exceeds a first threshold.

[0040] e) The ratio of the number of RBs in the guard band included in the first subchannel of the L subchannels having consecutive indices to the subchannel size exceeds a second threshold.

[0041] Since the greater the number of RBs in the guard band used in sidelink transmission, the higher the probability and degree of interference with data transmission. Therefore, it may be determined that the consecutive L subchannels are the first resource and need to be excluded only if the ratio of the number of RBs in the guard band included in the first subchannel to the total number of RBs included in the subchannels exceeds a second threshold.

[0042] f) The frequency domain RB resources in the L subchannels with consecutive indexes simultaneously include RBs in the RB set and RBs in the guard band, and the number of RBs in the guard band exceeds a third threshold.

[0043] In this case, all RBs in L consecutive subchannels are determined, and if the L consecutive subchannels simultaneously include RBs in the RB set and RBs in the guard band, if the number of RBs in the guard band exceeds a third threshold, the L consecutive subchannels are determined to be the first resource and need to be excluded. Here, the third threshold for the number of RBs may be an absolute value, a ratio, or a percentage.

[0044] g) At least one subchannel among the L subchannels having consecutive indices includes an RB within the guard band.

[0045] In this case, as long as any one of the L consecutive subchannels includes an RB within the guard band, the first resource consisting of the L consecutive subchannels belongs to the excluded range.

[0046] h) The index of the last RB in the last subchannel among the L subchannels having consecutive indices is greater than or equal to the index of the last RB in the nth RB set and less than or equal to the second RB index in the n+1th RB set.

[0047] Although Fig. 8 shows that the starting point of the first resource is limited, in an embodiment of the present application, the end point of the first resource may also be limited. Fig. 9 is a schematic diagram of another first resource in an embodiment of the present application, taking subchannels transmitted based on consecutive RBs as an example. As shown in Fig. 9, the first resource includes a total of L subchannels, namely, Sc m, Sc m+1, Sc m+2, ..., Sc m+L-1, and the index of the last RB in the last subchannel of the first resource (i.e., Sc m+L-1) is equal to or greater than the index of the last RB in the nth RB set (RB set0 in the figure). The index of the last RB in the last subchannel is equal to or less than the second RB index in the n+1th RB set (RB set1 in the figure). Each RB set includes multiple RBs, and the indexes of the RBs are arranged in reverse order, and the indexes of RBs in adjacent RB sets are also arranged in reverse order. In this way, the last RB in the last subchannel of the first resource is after the last RB in RB set0, i.e., the index of the last RB in the last subchannel of the first resource is equal to or greater than the index of the last RB in RB set0. The last RB in the last subchannel of the first resource is before the second position, which is the position of the second RB in RB set1 in FIG. 9 , i.e., the index of the last RB in the last subchannel of the first resource is equal to or less than the index of the second RB in RB set1. The L subchannels moving forward from the range of the last RB of the first resource are the first resource. By setting the last RB in the last subchannel of the first resource, i.e., the end point of the first subchannel, it is possible to avoid a guard band and the selection of only resources in one RB set for the selected physical layer time-frequency resource.

[0048] i) The last RB in the last subchannel of the L subchannels with consecutive indices is within the guard band.

[0049] This also limits the end point of the first resource, and indicates that the end point of the first resource is within the guard band if the last RB in the last subchannel of the first resource is within the guard band. The first resource configured in this way can avoid selecting only the guard band and resources in one RB set for the selected physical layer time-frequency resource.

[0050] j) The last subchannel of the L subchannels with consecutive indices includes RBs within the guard band.

[0051] Depending on the system configuration and usage environment, in some transmission scenarios, the use of resources within the guard band in sidelink transmission may affect transmission. Therefore, the first resource may be L consecutive subchannels, the last of which contains an RB within the guard band, i.e., as long as the last subchannel contains an RB within the guard band, it belongs to the excluded resources.

[0052] k) The number of RBs in the guard band included in the last subchannel of the L subchannels with consecutive indices exceeds a fourth threshold.

[0053] In this case, it is determined that the L consecutive subchannels are the first resource and need to be excluded only if the number of RBs in the guard band included in the last subchannel exceeds a fourth threshold.

[0054] l) The ratio of the number of RBs in the guard band included in the last subchannel among the L subchannels having consecutive indices to the subchannel size exceeds a fifth threshold.

[0055] Since the greater the number of RBs in the guard band used in sidelink transmission, the higher the probability and degree of interference with data transmission. Therefore, it may be determined that the consecutive L subchannels are the first resource and need to be excluded only if the ratio of the number of RBs in the guard band included in the last subchannel to the total number of RBs included in the subchannels exceeds a fifth threshold.

[0056] m) The frequency domain RBs included in the L subchannels with consecutive indices are interleaved differently according to different RB sets.

[0057] In one embodiment, when the SL resource pool is an interleaving-based resource as shown in Figure 6, the first resource further includes RB sets to which the L subchannels having consecutive indexes belong, and interleaved RBs in the interleaved resource that are different from each other due to different RB sets. As shown in Figure 6, when selecting candidate resources for four consecutive subchannels consisting of Sc4, Sc5, Sc6, and Sc7, the candidate resources are those in interleave 4 in RB set 0, but those in interleave 0, interleave 1, and interleave 2 in RB set 1. Therefore, the candidate resources consisting of four consecutive subchannels from Sc4 cannot be used and should be determined as the first resource.

[0058] In the first resource having any one of the above characteristics a) to m), the first RB index, the second RB index, the first threshold, the second threshold, the third threshold, the fourth threshold, and the fifth threshold are system-configurable or predefined, or the first RB index, the second RB index, the first threshold, the second threshold, the third threshold, the fourth threshold, and the fifth threshold are associated with at least one of a channel busy ratio (CBR), a packet priority, a channel access priority class (CAPC), and an RB set index.

[0059] The characteristics of the second resource are explained below.

[0060] The second resource has one of the following characteristics:

[0061] w) The included subchannels have the same interleave index across consecutive RB sets.

[0062] In the case of an SL resource pool primarily based on interleaving, i.e., the SL resource pool shown in FIG. 6, the second resources include L subchannels that are not completely contiguous. As long as the interleaving indexes of the L subchannels are the same across consecutive RB sets, the consecutive L subchannels can be selected as second resources to be used for sidelink transmission, even if their indices are not consecutive. For example, in FIG. 6, for four subchannels Sc0, Sc1, Sc5, and Sc6, starting from Sc0, the conventional sidelink resource selection method can only determine and indicate L consecutive subchannel resources. However, in this embodiment, Sc0, Sc1, Sc5, and Sc6 are one available candidate resource because they have the same interleaving index (both use interleaving 0 and interleaving 1) across consecutive RB sets (RB set 0 and RB set 1).

[0063] x) The included subchannels have interleaved consecutive indices in any RB set.

[0064] In this case, if the interleaved L subchannels in one RB set have consecutive indexes, the resource consisting of these L subchannels can be used as the second resource.

[0065] y) The included subchannels have non-consecutive interleave indices in any of the RB sets.

[0066] In this case, if the interleaving indexes of the L subchannels in one RB set are not consecutive, the resource consisting of these L subchannels can be used as the second resource.

[0067] z) The included subchannels are in contiguous RB sets.

[0068] If the L subchannels are in consecutive RB sets, the L subchannels can be used as second resources even if the indexes of the L subchannels are not consecutive or not completely consecutive.

[0069] In one embodiment, the above restriction rule for the physical layer candidate time-frequency resource sets is limited in the frequency domain, and in the sidelink resource determination method according to the embodiment of the present application, the physical layer time-frequency resource includes one slot or multiple consecutive slots in the time domain. That is, when determining the physical layer time-frequency resource for the sidelink transmission opportunity from the physical layer candidate time-frequency resource set, the determination principle in the frequency domain is that the selected physical layer time-frequency resource occupies the same slot in the time domain or the selected physical layer time-frequency resource occupies multiple consecutive slots in the time domain.

[0070] In one embodiment, the system configuration information includes instruction information on whether to exclude a first resource, or whether to add a second resource, or whether to exclude a first resource and add a second resource.

[0071] In this embodiment, the first resource occupies L subchannels with consecutive indexes in the frequency domain, meaning that the L subchannels are arranged in ascending order of indexes, and a subchannel with index k and a subchannel with the smallest index greater than k among the L subchannels are referred to as a pair of adjacent subchannels. The second resource occupies L subchannels in the frequency domain, and there is at least one pair of adjacent subchannels that do not have consecutive indexes, meaning that there is another subchannel resource that does not belong to the second resource between at least two adjacent subchannels among the L subchannels. For example, when the subcarrier spacing (SCS) is 15 kHz, one subchannel corresponds to one interleave in one RB set. When L=4, if the index of the starting subchannel is 1, subchannel indices 1, 2, 3, and 4 represent L subchannels with consecutive indexes. The subchannel indices 1, 2, 10, and 11, or the subchannel indices 1, 3, 5, and 7, mean that the indices of two different L subchannels are not consecutive.

[0072] In step 720, a physical layer time-frequency resource for the sidelink transmission opportunity is determined from the set of physical layer candidate time-frequency resources.

[0073] Once the physical layer candidate time-frequency resource sets are determined, physical layer time-frequency resources for sidelink transmission opportunities can be determined from the physical layer candidate time-frequency resource sets according to different resource selection schemes.

[0074] In this embodiment, the determined physical layer candidate time-frequency resource set does not include the first resource, includes the second resource, or does not include the first resource and includes the second resource. This limits the selection range of physical layer time-frequency resources when determining physical layer time-frequency resources for sidelink transmission opportunities. After a reasonable range of the first resource and the second resource is determined, the first node can avoid selecting unavailable resources when selecting resources for sidelink transmission.

[0075] After selecting the physical layer time-frequency resources, the determined physical layer time-frequency resources may be any one of the following resources: consecutive RBs in the frequency domain; a set of consecutive RBs in the frequency domain with different interleaves; a set of consecutive RBs in the frequency domain with the same interleaves; L consecutive subchannels; or L non-consecutive subchannels.

[0076] In the sidelink resource determination method according to this embodiment, a physical layer candidate time-frequency resource set for a sidelink transmission opportunity is determined from a sidelink resource pool based on system configuration information, and then a physical layer time-frequency resource for the sidelink transmission opportunity is determined from the physical layer candidate time-frequency resource set. The physical layer candidate time-frequency resource set is configured to either not include a first resource, or to include a second resource, or to not include the first resource but include the second resource, so that the resources selected for the sidelink transmission can meet the transmission needs and avoid a situation where the transmission cannot be completed due to the resources selected for the sidelink transmission being unavailable.

[0077] There are three methods for sidelink resource selection: full sensing, partial sensing, and random selection, where one of the sidelink resource selection methods is selected in the higher layer configuration or pre-configuration of the first node.

[0078] In one embodiment, determining physical layer candidate time-frequency resource sets for the sidelink transmission opportunity based on the system configuration information includes: the MAC layer excluding a first resource from the physical layer candidate time-frequency resource set for the sidelink transmission opportunity; or the MAC layer adding a second resource to the physical layer candidate time-frequency resource set for the sidelink transmission opportunity; or the MAC layer excluding the first resource and adding the second resource from the physical layer candidate time-frequency resource set for the sidelink transmission opportunity. This is a resource selection performed by the MAC of the first node, in which the physical layer of the first node does not exclude or add any sidelink transmission resources, and the MAC layer of the first node, after receiving the unrefined physical layer candidate time-frequency resource set reported to the physical layer, excludes the first resource from, or adds the second resource to, the physical layer candidate time-frequency resource set, or excludes the first resource and adds the second resource from, the physical layer candidate time-frequency resource set, based on the system configuration information. Here, when the first node selects transmission resources using the full sensing or partial sensing method, the MAC layer of the first node narrows down the transmission resources when it receives the physical layer candidate time-frequency resource set reported to the physical layer.When the first node selects transmission resources using the random selection method, the MAC layer of the first node narrows down the transmission resources when it performs random resource selection.

[0079] In one embodiment, determining a set of physical layer candidate time-frequency resources for a sidelink transmission opportunity based on the system configuration information includes: the physical layer excluding a first resource when determining the physical layer candidate time-frequency resources for the sidelink transmission opportunity in the resource selection window; or the physical layer adding a second resource when determining the physical layer candidate time-frequency resources for the sidelink transmission opportunity in the resource selection window; or the physical layer excluding the first resource and adding the second resource when determining the physical layer candidate time-frequency resources for the sidelink transmission opportunity in the resource selection window. This resource selection is performed by the physical layer of the first node, and the physical layer of the first node directly narrows down the transmission resources. Note that the resource selection window is the first step in the process of sidelink transmission, and a set of physical layer candidate time-frequency resources for the sidelink transmission opportunity has not yet been generated. The physical layer of the first node can exclude the first resource, add the second resource, or exclude the first resource and add the second resource when determining the physical layer candidate time-frequency resources for all or some of the slots in the resource selection window.

[0080] In one embodiment, determining a physical layer candidate time-frequency resource set for a sidelink transmission opportunity based on the system configuration information includes the physical layer excluding a first resource from the initialized physical layer candidate time-frequency resource set for the sidelink transmission opportunity, or the physical layer including a second resource in the initialized physical layer candidate time-frequency resource set for the sidelink transmission opportunity, or the physical layer excluding a first resource from the initialized physical layer candidate time-frequency resource set for the sidelink transmission opportunity and including a second resource. This resource selection is also performed by the physical layer of the first node, where initialization is a fourth step in the process of sidelink transmission, at which point the physical layer candidate time-frequency resource sets for the sidelink transmission opportunity have been generated, and the physical layer of the first node performs transmission resource refinement during the initialization process. The physical layer of the first node can exclude the first resource, add the second resource, or exclude the first resource and add the second resource from the initialized physical layer candidate time-frequency resource set for the sidelink transmission opportunity.

[0081] In one embodiment, determining physical layer candidate time-frequency resource sets for the sidelink transmission opportunity based on the system configuration information includes: the physical layer excluding a first resource from the physical layer candidate time-frequency resource sets for the sidelink transmission opportunity that are reported to the MAC layer of the first node; or the physical layer including a second resource from the physical layer candidate time-frequency resource sets for the sidelink transmission opportunity that are reported to the MAC layer of the first node; or the physical layer excluding the first resource from the physical layer candidate time-frequency resource sets for the sidelink transmission opportunity that are reported to the MAC layer of the first node and including the second resource. This is also resource selection performed by the physical layer of the first node, where reporting the physical layer candidate time-frequency resource sets for the sidelink transmission opportunity to the MAC layer by the physical layer is a seventh step in the process of sidelink transmission, at which point the physical layer candidate time-frequency resource sets for the sidelink transmission opportunity have been generated and need to be reported to the MAC layer of the first node; and the physical layer of the first node performs transmission resource refinement when reporting the physical layer candidate time-frequency resource sets for the sidelink transmission opportunity to the MAC layer. The physical layer of the first node may exclude the first resource from the physical layer candidate time-frequency resource set for the sidelink transmission opportunity reported to the MAC layer, or may add the second resource, or may exclude the first resource and add the second resource.

[0082] FIG. 10 is a structural schematic diagram of a sidelink resource determination device according to an embodiment of the present application. As shown in FIG. 10, the sidelink resource determination device according to this embodiment includes a resource set determination module 101 and a resource selection module 102.

[0083] The resource set determination module 101 is configured to determine a physical layer candidate time-frequency resource set for a sidelink transmission opportunity from a sidelink resource pool based on system configuration information. The resource selection module 102 is configured to determine a physical layer time-frequency resource for a sidelink transmission opportunity from the physical layer candidate time-frequency resource set, where the physical layer candidate time-frequency resource set does not include a first resource occupying L subchannels with consecutive indexes in the frequency domain, or includes a second resource occupying L subchannels in the frequency domain with at least one pair of adjacent subchannels that do not have consecutive indexes, or does not include the first resource occupying L subchannels that are consecutive in the frequency domain, but includes a second resource occupying L subchannels in the frequency domain with at least one pair of adjacent subchannels that do not have consecutive indexes, where L is an integer greater than or equal to 1.

[0084] The sidelink resource determination device of this embodiment is used to perform the sidelink resource determination method in the embodiment shown in FIG. 7, and the implementation principles and technical effects thereof are similar, so they will not be described again here.

[0085] FIG. 11 is a structural schematic diagram of one sidelink resource determination device according to an embodiment of the present application. As shown in FIG. 11, the sidelink resource determination device includes a processor 111, a memory 112, a receiver 113, and a transmitter 114. The number of processors 111 in the sidelink resource determination device may be one or more, but FIG. 11 takes one processor 111 as an example. The processor 111, the memory 112, the receiver 113, and the transmitter 114 in the sidelink resource determination device may be connected by a bus or other methods, but FIG. 11 takes them as an example connected by a bus.

[0086] The memory 112 may be used as a computer-readable storage medium to store software programs, computer-executable programs and modules, such as program instructions and modules corresponding to the sidelink resource determination method in the embodiment of Fig. 7 of the present application. The processor 111 executes the software programs, instructions and modules stored in the memory 112 to apply various functions and data processing of the sidelink resource determination device, i.e., to realize the above-mentioned sidelink resource determination method.

[0087] The memory 112 may mainly include a program storage area capable of storing an operating system, an application program required for at least one function, and a data storage area capable of storing data generated by use of the sidelink resource determination device, etc. The memory 112 may also include a high-speed random access memory, and may also include a non-volatile memory such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage device.

[0088] The receiver 113 is any one or more of a combination of devices or modules capable of receiving wireless signals, and the transmitter 114 is any one or more of a combination of devices or modules capable of transmitting wireless signals.

[0089] An embodiment of the present application further provides a storage medium comprising computer-executable instructions for, when executed by a computer processor, performing a sidelink resource determination method, the method comprising: determining, based on system configuration information, a physical layer candidate time-frequency resource set for a sidelink transmission opportunity from a sidelink resource pool; and determining physical layer time-frequency resources for the sidelink transmission opportunity from the physical layer candidate time-frequency resource set, wherein the physical layer candidate time-frequency resource set does not include a first resource occupying L subchannels having consecutive indices in the frequency domain, or includes a second resource occupying L subchannels in the frequency domain with at least a pair of adjacent subchannels that do not have consecutive indices, or does not include the first resource occupying L subchannels that are consecutive indices in the frequency domain, but includes a second resource occupying L subchannels in the frequency domain with at least a pair of adjacent subchannels that do not have consecutive indices, where L is an integer greater than or equal to 1.

Claims

1. 1. A sidelink resource determination method applied to a first node, comprising: determining a set of physical layer candidate time-frequency resources for a sidelink transmission opportunity from a sidelink resource pool based on system configuration information; determining a physical layer time-frequency resource for a sidelink transmission opportunity from the physical layer candidate time-frequency resource set; The physical layer candidate time-frequency resource set comprises: does not include a first resource occupying L subchannels having consecutive indices in the frequency domain; L is an integer of 1 or more, The first resource is an index of a first resource block (RB) in a first subchannel among the L subchannels having consecutive indices is equal to or greater than a first RB index in the n-th RB set and equal to or less than an index of a first RB in the n+1-th RB set; the first RB in the first subchannel among the L subchannels having consecutive indices is within the guard band; a first subchannel among the L subchannels having consecutive indices includes a RB within the guard band; the number of RBs in the guard band included in the first subchannel of the L subchannels having consecutive indices exceeds a first threshold; a ratio of the number of RBs in the guard band included in the first subchannel among the L subchannels having consecutive indices to the subchannel size exceeds a second threshold; The frequency domain RB resources in the L subchannels having consecutive indexes simultaneously include RBs in the RB set and RBs in the guard band, and the number of RBs in the guard band exceeds a third threshold; At least one subchannel among the L subchannels having consecutive indexes includes a RB within a guard band; an index of the last RB in the last subchannel among the L subchannels having consecutive indices is equal to or greater than an index of the last RB in the n-th RB set and equal to or less than a second RB index in the n+1-th RB set; the last RB in the last subchannel of the L subchannels having consecutive indices is within the guard band; The last subchannel of the L subchannels having consecutive indices includes a RB within the guard band; the number of RBs in the guard band included in the last subchannel of the L subchannels having consecutive indices exceeds a fourth threshold; a ratio of the number of RBs in the guard band included in the last subchannel among the L subchannels having consecutive indices to the subchannel size exceeds a fifth threshold; the frequency domain RBs included in the L subchannels having consecutive indices are interleaved differently in different RB sets; A method for determining sidelink resources.

2. The physical layer time-frequency resource includes one slot or a plurality of consecutive slots in the time domain. The method of claim 1.

3. the system configuration information includes instruction information indicating whether to exclude the first resource; The method of claim 1.

4. The first RB index, the second RB index, the first threshold, the second threshold, the third threshold, the fourth threshold, and the fifth threshold are Is it system-configured or predefined? Or, it is related to at least one of a channel busy ratio (CBR), a packet priority, a channel access priority (CAPC), and an RB set index. The method of claim 1.

5. determining a physical layer candidate time-frequency resource set for a sidelink transmission opportunity from a sidelink resource pool based on system configuration information, and excluding the first resource from a set of physical layer candidate time-frequency resources for sidelink transmission opportunities. The method of claim 1.

6. determining a physical layer candidate time-frequency resource set for a sidelink transmission opportunity from a sidelink resource pool based on system configuration information, and excluding the first resource when determining physical layer candidate time-frequency resources for sidelink transmission opportunities in a resource selection window. The method of claim 1.

7. determining a physical layer candidate time-frequency resource set for a sidelink transmission opportunity from a sidelink resource pool based on system configuration information, and excluding the first resource from a set of physical layer candidate time-frequency resources for the initialized sidelink transmission opportunity. The method of claim 1.

8. determining a physical layer candidate time-frequency resource set for a sidelink transmission opportunity from a sidelink resource pool based on system configuration information, and excluding the first resource from a physical layer candidate time-frequency resource set for sidelink transmission opportunities reported to a MAC layer of the first node. The method of claim 1.

9. a memory configured to store a program; a processor configured to execute a program, the program executing which performs the sidelink resource determination method according to any one of claims 1 to 8. Sidelink resource determination equipment.

10. a stored program which, when executed, performs the sidelink resource determination method according to any one of claims 1 to 8; Non-volatile storage media.

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