Channel access method, and device and storage medium

Abstract

Provided in the present application are a channel access method, and a device and a storage medium. The channel access method, which is applied to a first communication device, comprises: receiving resource indication information, which is indicated by a second communication device and at least carries a (cyclic prefix extension) CPE selection policy; and according to the CPE selection policy, determining a start position of CPE.

Description

Channel access method, device and storage medium Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a channel access method, device, and storage medium. Background Art

[0002] Sidelink communications, such as Long Term Evolution (LTE) SideLink and New Radio (NR) SideLink, support two resource allocation modes: base station scheduling (e.g., LTE mode 3, NR mode 1) and user equipment (UE) autonomous resource selection (e.g., LTE mode 4, NR mode 2). In the base station scheduling mode, resources are allocated by the base station and indicated to the UE; in the UE autonomous resource selection mode, the UE selects idle resources as communication resources by monitoring resource usage in the resource pool.

[0003] In addition, SideLink communication also supports operation on the Intelligent Traffic System (ITS) spectrum, licensed spectrum, and unlicensed spectrum. In order to reduce resource indication overhead, SideLink supports resource allocation and indication granularity with subchannel as the frequency domain. A subchannel is a number of resource blocks (RBs) that are continuous in the frequency domain within a resource pool. On the unlicensed spectrum, SideLink communication still uses subchannel as the resource allocation granularity in the frequency domain. However, before the actual signal is sent, channel monitoring is required on the channel corresponding to the allocated resources or selected resources. Only when the channel monitoring is idle can the channel be accessed for signal transmission. Channel monitoring methods include Type 1, Type 2A / 2B / 2C, etc.

[0004] If a base station or access point (AP) operates in an unlicensed carrier, it can monitor channel conditions and share the acquired channel occupancy time (COT) with other UEs, or share the COT acquired by a UE, or share the COT acquired by a UE with other UEs. This improves resource utilization efficiency between UEs and allows the UE to access its channel access type. However, if the base station or AP operates in the licensed spectrum or does not operate in the unlicensed spectrum, the base station cannot effectively control the UE's resource usage and channel access.

[0005] Summary of the Invention

[0006] In view of this, the embodiments of the present application provide a channel access method, device and storage medium, which effectively improve resource utilization efficiency and increase the success rate of terminal access to the channel.

[0007] An embodiment of the present application provides a channel access method, applied to a first communication device, including:

[0008] Receiving resource indication information indicated by the second communication device and carrying at least a cyclic prefix extension CPE selection policy;

[0009] The starting position of the CPE is determined according to the CPE selection strategy.

[0010] An embodiment of the present application provides a channel access method, applied to a first communication device, including:

[0011] receiving resource indication information sent by the second communication device;

[0012] The CPE starting position is selected according to the resource usage of other first communication devices and the communication resources indicated by the resource indication information.

[0013] An embodiment of the present application provides a channel access method, applied to a second communication device, including:

[0014] Indicate to the first communication device the resource indication information at least carrying the cyclic prefix extension CPE selection policy, so that the first communication device determines the starting position of the CPE according to the CPE selection policy.

[0015] An embodiment of the present application provides a communication device, comprising: a memory, and one or more processors;

[0016] The memory is configured to store one or more programs;

[0017] When the one or more programs are executed by the one or more processors, the one or more processors implement the method described in any one of the above embodiments.

[0018] An embodiment of the present application provides a storage medium storing a computer program. When the computer program is executed by a processor, the method described in any one of the above embodiments is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a schematic diagram of an interaction of edge link communication provided by related art;

[0020] FIG2 is a flow chart of a channel access method provided in an embodiment of the present application;

[0021] FIG3 is a flow chart of another channel access method provided in an embodiment of the present application;

[0022] FIG4 is a flow chart of another channel access method provided in an embodiment of the present application;

[0023] FIG5 is a schematic diagram of a configuration of a CPE starting position provided in an embodiment of the present application;

[0024] FIG6 is a structural block diagram of a channel access device provided in an embodiment of the present application;

[0025] FIG7 is a structural block diagram of another channel access device provided in an embodiment of the present application;

[0026] FIG8 is a structural block diagram of another channel access device provided in an embodiment of the present application;

[0027] FIG9 is a schematic structural diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The following describes the embodiments of the present application in conjunction with the accompanying drawings. The following describes the present application in conjunction with the accompanying drawings. The examples are only used to explain the present application and are not used to limit the scope of the present application.

[0029] Wireless communication technology is advancing rapidly, and applications across various verticals are booming. To meet these increasingly diverse communication needs, UE-to-UE direct communication (also known as SideLink communication), a key fifth-generation (5G) mobile communication technology, is emerging. It will also be a key technology in the evolution of 5G to 5G Advance and even 6G.

[0030] Figure 1 is a schematic diagram of a sidelink communication interaction provided by related technologies. As shown in Figure 1, in a sidelink communication system, when services need to be transmitted between UEs, the service data between the UEs can be sent directly from the source UE to the target UE via the SideLink link without passing through the network side.

[0031] SideLink communications (e.g., device-to-device (D2D) and vehicle-to-everything (V2X) technologies) can operate in a variety of scenarios, including those with network coverage, partial network coverage, and no coverage. SideLink communications can also operate in ITS spectrum, licensed spectrum, and even unlicensed spectrum in the future. SideLink communications can reduce the burden on cellular networks, reduce battery power consumption of user devices, increase data rates, and improve the robustness of network infrastructure, effectively meeting the requirements of high-data-rate services and proximity services. It also supports direct communication in scenarios without network coverage, meeting the communication needs of public safety, the Internet of Vehicles, and other areas.

[0032] In the SideLink communication system, the UE supports two communication modes: Mode 1, communication based on base station scheduling (called Mode 1 in D2D, Mode 3 in LTE V2X, and Mode 1 in NR V2X); Mode 2, communication in which the UE independently selects resources (called Mode 2 in D2D, Mode 4 in LTE V2X, and Mode 2 in NR V2X).

[0033] Sidelink operates in unlicensed spectrum. When the UE operates in NR Mode 2, the UE can independently select resources and channel access types, such as Type 1, Type 2A / 2B / 2C. Under different access modes, there are multiple ways to determine the cyclic prefix extension (CPE), but none of them rely on the base station's instructions. However, when the UE operates in mode 1, and assuming that the base station or access point (AP) operates in an unlicensed carrier, the base station or access point can monitor the channel conditions and share the obtained COT with other UEs, or share the COT obtained by the UE, or share the COT obtained by the UE with other UEs. This can improve resource utilization efficiency between UEs and know the channel access type of the UE. However, if it is assumed that the base station or access point (AP) operates in the licensed spectrum or does not operate in the unlicensed spectrum, how to control the UE's resource usage and channel access is an urgent problem to be solved.

[0034] In view of this, an embodiment of the present application provides a channel access method, which indicates the CPE selection strategy to the UE through a base station or access point (AP), which can help UEs to frequency-division multiplex resources, or avoid resource conflicts between UEs, and avoid blocking the access of other UEs when UEs compete for access, effectively improving resource utilization efficiency, and increasing the success probability of UE accessing the channel, while bringing great flexibility and operability to network management.

[0035] In one embodiment, Figure 2 is a flowchart of a channel access method provided by an embodiment of the present application. This embodiment is applicable to controlling resource usage and channel access of a terminal when a base station or access point operates in a licensed spectrum or does not operate in an unlicensed spectrum. This embodiment can be executed by a first communications device, which can be a UE. As shown in Figure 2, this embodiment includes S110-S120.

[0036] S110: Receive resource indication information indicating at least a CPE selection policy indicated by a second communication device.

[0037] S120: Determine the starting position of the CPE according to the CPE selection strategy.

[0038] When the second communication device sends resource indication information to the first communication device, the resource indication information can carry a CPE selection policy. The first communication device can determine the starting position of the CPE according to the CPE selection policy and perform channel access according to the starting position of the CPE.

[0039] In one embodiment, the CPE selection strategy includes at least one of the following:

[0040] Use the default CPE starting position of the current resource pool;

[0041] Randomly select a CPE starting position from the set of available CPEs in the current resource pool;

[0042] Select a CPE starting position corresponding to the current data priority from the available CPE set in the current resource pool;

[0043] Select a CPE starting position from the set of available CPEs corresponding to the current data priority of the current resource pool;

[0044] Select a CPE starting position corresponding to the current channel access priority from the available CPE set in the current resource pool;

[0045] A CPE starting position is selected from the available CPE set corresponding to the current channel access priority of the current resource pool.

[0046] In one embodiment, the resource indication information includes at least one of the following: physical layer dynamic indication information; and high-layer indication information. The second communication device may dynamically indicate the CPE selection policy to the first communication device via the physical layer dynamic indication information, where the physical layer dynamic indication information may include downlink control information (DCI). The second communication device may also semi-statically indicate the CPE selection policy to the first communication device via high-layer indication information, where the high-layer indication information may include radio resource control (RRC) or system information block (SIB).

[0047] In one embodiment, if the CPE selection policy carried in the resource indication information is invalid, the resource indication information does not carry the CPE selection policy, or the CPE selection policy corresponds to a specific indication value, the corresponding CPE starting position is selected based on resource usage of other first communication devices. If the resource indication information sent by the second communication device does not indicate a CPE selection policy, or the indicated CPE selection policy is invalid, or the CPE selection policy corresponds to a specific indication value, the first communication device may select the CPE starting position based on resource usage of other first communication devices.

[0048] In one embodiment, selecting a corresponding CPE starting position according to resource usage of other first communication devices includes:

[0049] When the reserved communication resources of the other first communication devices and the communication resources indicated by the resource indication information are in the same time slot, selecting a default CPE starting position;

[0050] When the reserved communication resources of other first communication devices and the communication resources indicated by the resource indication information are not in the same time slot, a CPE starting position is selected from a pre-configured CPE starting position set.

[0051] In one embodiment, the CPE starting location set includes at least one of the following:

[0052] The set of available CPEs in the current resource pool;

[0053] The set of available CPEs corresponding to the current data priority of the current resource pool;

[0054] The available CPE set corresponding to the current channel access priority of the current resource pool.

[0055] The current resource pool can use a CPE starting position corresponding to the current data priority in the CPE set;

[0056] The current resource pool may use a CPE starting position corresponding to the current channel access priority in the CPE set.

[0057] In one embodiment, the resource indication information is further used to indicate the data priority or channel access priority of the currently authorized resources. The resource indication information can indicate the data priority of data transmitted on the currently authorized resources, or the channel access priority corresponding to the currently authorized resources. The higher the channel access priority, the shorter the time required to access the channel.

[0058] In one embodiment, the CPE selection policy occupies at least one bit in the resource indication information. The CPE selection policy can be indicated by occupying one bit in the resource indication information, or by occupying at least two bits in the resource indication information. In one example, when the CPE selection policy is indicated by physical layer dynamic indication information, one bit can be used to indicate the CPE selection policy to reduce resource usage. In another example, when the CPE selection policy is indicated by higher layer indication information, two bits can be used to indicate the CPE selection policy.

[0059] In one embodiment, Figure 3 is a flowchart of another channel access method provided by an embodiment of the present application. This embodiment is applicable to controlling resource usage and channel access of a terminal when a base station or access point operates in a licensed spectrum or does not operate in an unlicensed spectrum. This embodiment can be executed by a first communications device. In this embodiment, the first communications device directly selects a CPE starting location. As shown in Figure 3, this embodiment includes S210-S220.

[0060] S210: Receive resource indication information sent by a second communication device.

[0061] S220: Select a CPE starting position according to resource usage of other first communication devices and the communication resources indicated by the resource indication information.

[0062] In an embodiment, the first communication device may directly select the CPE starting position according to resource usage of other first communication devices and its own communication resources.

[0063] In one embodiment, selecting the CPE starting position based on resource usage of other first communication devices and the communication resources indicated by the resource indication information includes at least one of the following:

[0064] When the reserved communication resources of the other first communication devices and the communication resources indicated by the resource indication information are in the same time slot and the resources do not overlap, selecting a default CPE starting position;

[0065] When the reserved communication resources of the other first communication devices and the communication resources indicated by the resource indication information are in the same time slot and the resources overlap, and the reference signal received power (RSRP) value of the reserved communication resources of the other first communication devices is lower than a preset RSRP threshold value, selecting a default CPE starting position;

[0066] When the reserved communication resources of other first communication devices and the communication resources indicated by the resource indication information are in the same time slot, the resources overlap, and the RSRP value of the reserved resources is higher than the preset RSRP threshold value, a CPE starting position is selected from the pre-configured CPE starting position set.

[0067] In one embodiment, the CPE starting location set includes at least one of the following:

[0068] The set of available CPEs in the current resource pool;

[0069] The set of available CPEs corresponding to the current data priority of the current resource pool;

[0070] The available CPE set corresponding to the current channel access priority of the current resource pool.

[0071] The current resource pool can use a CPE starting position corresponding to the current data priority in the CPE set;

[0072] The current resource pool may use a CPE starting position corresponding to the current channel access priority in the CPE set.

[0073] In one embodiment, Figure 4 is a flowchart of another channel access method provided by an embodiment of the present application. This embodiment is applied to controlling resource usage and channel access of a terminal when a base station or access point operates in a licensed spectrum or does not operate in an unlicensed spectrum. This embodiment can be executed by a second communication device. As shown in Figure 4, this embodiment includes: S310-S320.

[0074] S310: Indicate resource indication information at least carrying a CPE selection policy to the first communication device, so that the first communication device determines a starting position of the CPE according to the CPE selection policy.

[0075] In one embodiment, the CPE selection strategy includes at least one of the following:

[0076] Use the default CPE starting position of the current resource pool;

[0077] Randomly select a CPE starting position from the set of available CPEs in the current resource pool;

[0078] Select a CPE starting position corresponding to the current data priority from the available CPE set in the current resource pool;

[0079] Select a CPE starting position from the set of available CPEs corresponding to the current data priority of the current resource pool;

[0080] Select a CPE starting position corresponding to the current channel access priority from the available CPE set in the current resource pool;

[0081] A CPE starting position is selected from the available CPE set corresponding to the current channel access priority of the current resource pool.

[0082] In one embodiment, the resource indication information includes at least one of the following: physical layer dynamic indication information; and high layer indication information.

[0083] In one embodiment, the resource indication information is further used to indicate the data priority or channel access priority on the currently authorized resources.

[0084] In one embodiment, the CPE selection strategy occupies at least one bit in the resource indication information.

[0085] It should be noted that for the explanation of parameters such as resource indication information and CPE selection strategy involved in the channel access method applied to the second communication device, please refer to the description of the corresponding parameters in the channel access method applied to the first communication device above, and will not be repeated here.

[0086] In the following embodiments, the process of determining the starting position of the CPE is described by taking the first communication device as a UE and the second communication device as a base station as an example.

[0087] In one embodiment, a CPE selection policy may be indicated to the UE by the base station to determine the starting position of the CPE. The base station (or AP) indicates to the UE the policy for determining the CPE when transmitting data indicated by the current DCI, wherein the CPE selection policy includes at least one of the following: using the default CPE starting position of the current resource pool; randomly selecting a CPE starting position from the set of CPEs available in the current resource pool; selecting a CPE starting position corresponding to the current data priority (Priority) from the set of CPEs available in the current resource pool; selecting a CPE starting position from the set of CPEs available in the current resource pool corresponding to the current data priority (Priority) of the current resource pool; selecting a CPE starting position corresponding to the current channel access priority (CAPC) from the set of CPEs available in the current resource pool; or selecting a CPE starting position from the set of CPEs available in the current resource pool corresponding to the current channel access priority (CAPC).

[0088] Optionally, the priority or channel access priority class (CAPC) may be indicated by DCI.

[0089] The above method can achieve the following operations: If resources between UEs are allocated using Frequency Division Multiplexing (FDM), by instructing the UEs to use the same CPE selection strategy (such as using the default CPE starting position), CPE alignment between the UEs is ensured, thereby avoiding blocking when performing Listen Before Talk (LBT) operations between the UEs. If resources between UEs are to be staggered using Time Division Multiplexing (TDM), resource usage conflicts on the same resources can be avoided. In addition, by instructing the UEs to use different CPEs (such as selecting a CPE starting position corresponding to the current data priority from the set of available CPEs in the current resource pool), resource usage is staggered, thereby avoiding resource conflicts.

[0090] In one embodiment, the base station indicates the CPE selection policy to the UE, which may include the following three examples:

[0091] In example 1, the base station (or AP) indicates the CPE selection strategy to the UE via DCI, and the strategy is indicated by 1 bit in the DCI. For example, '0' indicates that the CPE selection strategy is to use the default CPE starting position of the current resource pool; '1' indicates that the CPE selection strategy is to select a CPE starting position from the available CPE set corresponding to the current channel access priority (CAPC) of the current resource pool. At the same time, the DCI also indicates the resources used by the SideLink, including the resources used by the Physical Sidelink Control Channel (PSCCH) and the Physical Sidelink Shared Channel (PSSCH). The resource location is subchannel 1 and 2 in resource block set 1 (RB set 1) on time slot k. When the UE transmits PSCCH and PSSCH in slot k, it selects the CPE according to the CPE selection strategy indicated by the base station. If the indication is '0', it selects the default CPE starting position from the RRC or predefined current resource pool, such as Tsym1+25us, where Tsym1 represents the starting position of the symbol before the automatic gain control (AGC) symbol. The AGC symbol is the first symbol of the resource used by the SideLink. For example, if the indication is '1', it selects a CPE starting position from the available CPE set corresponding to the current CAPC in the RRC or predefined current resource pool. For example, the available CPE set corresponding to the current CAPC is {{T sym_1 +16μs,T sym_1 +25μs,T sym_1 +34μs,T sym_1 +43μs,T sym_1 +52μs,T sym_1 +61μs,T sym_0}, the UE randomly selects a position, such as Tsym1+25us; if the usable CPE set corresponding to the current CAPC is a value, then the value is selected. Tsym1 represents the starting position of the symbol before the AGC symbol. The AGC symbol is the first symbol of the resource used by the SideLink. For example, Figure 5 is a configuration diagram of a CPE starting position provided in an embodiment of the present application. As shown in Figure 5, the first symbol of the resource used by the SideLink can be used as the symbol starting position, that is, the AGC symbol; then the CPE starting position is determined based on the starting position of the symbol before the AGC symbol.

[0092] Optionally, the data priority or CAPC is indicated by DCI, or by a higher layer of the UE.

[0093] Example 2: In addition to the DCI indication method, for semi-static resource indication (Configure grant), the CPE policy can also be determined through RRC message indication.

[0094] The base station (or AP) configures semi-static resources (configured grant) available to the UE via RRC messages. This also indicates the CPE selection policy for data transmission, which can be indicated by two bits in the RRC message. For example, '0' indicates that the CPE selection policy for the current resource is to use the default CPE starting position in the current resource pool, or to select the first CPE starting position from the available CPE set corresponding to the current channel access priority (CAPC) in the current resource pool; '1' indicates that the CPE selection policy for the current resource is to select the second CPE starting position from the available CPE set corresponding to the current channel access priority (CAPC) in the current resource pool; '2' indicates that the CPE selection policy for the current resource is to select the third CPE starting position from the available CPE set corresponding to the current channel access priority (CAPC) in the current resource pool; and '3' indicates that the CPE selection policy for the current resource is to select the fourth CPE starting position from the available CPE set corresponding to the current channel access priority (CAPC) in the current resource pool.

[0095] Among them, semi-static resources (configured grant) include resources used by PSCCH and PSSCH, and the resource locations are subchannel 1 and 2 in RB set 1 on slot k. When the UE transmits PSCCH and PSSCH in slot k, it selects the CPE according to the CPE selection strategy indicated by the base station. For example, the indication is '0', that is, the default CPE starting position of the current resource pool or the predefined current resource pool is selected, or the selection strategy of the CPE corresponding to the current resource is to select the first CPE starting position from the available CPE set corresponding to the current channel access priority (CAPC) of the current resource pool, such as Tsym1+25us. Tsym1 represents the starting position of the symbol before the AGC symbol. The AGC symbol is the first symbol of the resource used by SideLink. For example, the indication is '1', that is, the second CPE starting position is selected from the available CPE set corresponding to the current channel access priority (CAPC) of the current resource pool or the predefined current resource pool, for example, the available CPE set corresponding to the current channel access priority (CAPC) is {T sym_1 +16μs,T sym_1 +25μs,T sym_1 +34μs,T sym_1 +43μs,Tsym_1 +52μs,T sym_1 +61μs,T sym_0 The UE selects the second position, such as Tsym1 + 25us. If the available CPE set corresponding to the current channel access priority (CAPC) is a single value, that value is selected. Tsym1 represents the starting position of the symbol preceding the AGC symbol. The AGC symbol is the first symbol of the resources used by the SideLink.

[0096] Optionally, the priority or channel access priority (CAPC) is indicated by RRC or by a higher layer of the UE.

[0097] Example three: When the base station (or AP) instructs the UE to transmit data indicated by the current DCI, it determines that the CPE policy is invalid, or there is no indication of the CPE policy, or a specific indication value; or, the base station (or AP) configures a semi-static resource (configured grant) that the UE can use through an RRC message, and the CPE policy corresponding to the resource is empty (invalid), or there is no indication, or it is a specific indication value.

[0098] In the above indication situation, the UE selects the CPE starting position based on monitoring the resource usage of other UEs. If the UE monitors that the resources reserved by other UEs are in the same slot as the resources indicated by the UE through DCI or RRC, the UE selects the configured or pre-configured default CPE starting position. Otherwise, the UE randomly selects a CPE starting position from the following CPE starting position set, where the starting position set includes at least one of the following:

[0099] The set of CPEs available in the current resource pool;

[0100] The set of available CPEs corresponding to the current data priority in the current resource pool;

[0101] The set of available CPEs corresponding to the current channel access priority (CAPC) in the current resource pool;

[0102] The current resource pool can use a CPE starting position corresponding to the current data priority in the CPE set;

[0103] The current resource pool may use a CPE starting position corresponding to the current channel access priority in the CPE set.

[0104] Example 4: When the base station (or AP) instructs the UE to transmit data indicated by the current DCI, it determines that the CPE policy is invalid, or there is no indication of the CPE policy, or a specific indication value. Alternatively, the base station (or AP) configures a semi-static resource (configured grant) that the UE can use through an RRC message, and the CPE policy corresponding to the resource is empty (invalid), or there is no indication, or it is a specific indication value.

[0105] In the above indication conditions, the UE selects a CPE starting position based on the resource usage of other UEs and the channel access type. When the channel access type is type 2, or type 2A / 2B / 2C, the UE selects a configured or pre-configured default CPE starting position. When the channel access type is type 1, and the UE detects that the resources reserved by other UEs are in the same slot as the resources indicated by the UE via DCI or RRC, the UE selects a configured or pre-configured default CPE starting position. Otherwise, the UE randomly selects a CPE starting position from the following CPE starting position set, which includes at least one of the following:

[0106] The set of CPEs available in the current resource pool;

[0107] The set of available CPEs corresponding to the current data priority in the current resource pool;

[0108] The set of available CPEs corresponding to the current channel access priority (CAPC) in the current resource pool;

[0109] The current resource pool can use a CPE starting position corresponding to the current data priority in the CPE set;

[0110] The current resource pool may use a CPE starting position corresponding to the current channel access priority in the CPE set.

[0111] In one embodiment, the CPE selection strategy indicated by the base station received by the UE may include the following three examples:

[0112] In Example 1, a UE receives a DCI from a base station (or AP). The DCI indicates the CPE selection policy for data transmission, represented by a single bit. '0' indicates that the CPE selection policy uses the default CPE starting position in the current resource pool; '1' indicates that the CPE selection policy selects a CPE starting position from the set of available CPEs corresponding to the current channel access priority (CAPC) in the current resource pool. The DCI also indicates the resources used by the SideLink, including those used by the PSCCH and PSSCH. The resource locations are subchannels 1 and 2 within RB set 1 in slot k. When transmitting PSCCH and PSSCH in slot k, the UE determines the CPE policy indicated by the base station. If the indication is '0', the default CPE starting position in the current resource pool, such as Tsym1+25us, is used, where Tsym1 represents the starting position of the symbol preceding the AGC symbol. The AGC symbol is the first symbol of the resources used by the SideLink. If the indication is '1', a CPE starting position is selected from the available CPE set corresponding to the current channel access priority (CAPC) of the current resource pool or the predefined current channel access priority (CAPC). For example, the available CPE set corresponding to the current channel access priority (CAPC) is {T sym_1 +16μs,T sym_1 +25μs,T sym_1 +34μs,T sym_1 +43μs,T sym_1 +52μs,T sym_1 +61μs,T sym_0 The UE randomly selects a position, such as Tsym1 + 25us. If the available CPE set corresponding to the current channel access priority (CAPC) is a single value, that value is selected. Tsym1 represents the starting position of the symbol preceding the AGC symbol. The AGC symbol is the first symbol of the resources used by the SideLink.

[0113] The UE determines the CPE location according to the CPE policy indicated by the DCI. When accessing a channel, the UE attempts to access the channel based on the determined CPE location, including using a Type 1 access channel or a Type 2A / 2B / 2C access channel.

[0114] Optionally, the priority or channel access priority (CAPC) is indicated by DCI or by a higher layer of the UE.

[0115] Example 2: In addition to the DCI indication method, for semi-static resource indication (Configure grant), the CPE policy can also be determined through RRC message indication.

[0116] The UE receives an RRC message from the base station (or AP). This RRC message configures the semi-static resources (configured grant) that the UE can use. The message also indicates the policy for determining the CPE during data transmission, which is indicated by two bits. '0' indicates that the CPE selection policy corresponding to the current resource is to use the default CPE starting position in the current resource pool, or to select the first CPE starting position from the available CPE set corresponding to the current channel access priority (CAPC) in the current resource pool. '1' indicates that the CPE selection policy corresponding to the current resource is to select the second CPE starting position from the available CPE set corresponding to the current channel access priority (CAPC) in the current resource pool. '2' indicates that the CPE selection policy corresponding to the current resource is to select the third CPE starting position from the available CPE set corresponding to the current channel access priority (CAPC) in the current resource pool. '3' indicates that the CPE selection policy corresponding to the current resource is to select the fourth CPE starting position from the available CPE set corresponding to the current channel access priority (CAPC) in the current resource pool.

[0117] Among them, semi-static resources (configured grant) include resources used by PSCCH and PSSCH, and the resource locations are subchannels 1 and 2 in RB set 1 on slot k. When the UE transmits PSCCH and PSSCH in slot k, it determines the CPE strategy according to the base station's indication. If the indication is '0', it selects the first CPE starting position from the set of available CPEs corresponding to the current channel access priority (CAPC) of the current resource pool or the predefined default CPE starting position, or the current resource, such as Tsym1+25us. Tsym1 represents the starting position of the symbol before the AGC symbol. The AGC symbol is the first symbol of the resource used by the sidelink. If the indication is '1', it selects the second CPE starting position from the set of available CPEs corresponding to the current channel access priority (CAPC) of the current resource pool or the predefined CPE starting position. For example, the set of available CPEs corresponding to the current channel access priority (CAPC) is {T sym_1 +16μs,T sym_1 +25μs,T sym_1 +34μs,T sym_1 +43μs,T sym_1 +52μs,T sym_1 +61μs,T sym_0The UE selects the second position, such as Tsym1 + 25µs. If the available CPE set corresponding to the current channel access priority (CAPC) is a single value, that value is selected. Tsym1 represents the starting position of the symbol preceding the AGC symbol. The AGC symbol is the first symbol of the resources used by the sidelink.

[0118] The UE determines the CPE location according to the CPE policy indicated by the RRC. When accessing a channel, the UE attempts to access the channel based on the determined CPE location, including using a Type 1 access channel or a Type 2A / 2B / 2C access channel.

[0119] Optionally, the priority or channel access priority (CAPC) is indicated by RRC or by a higher layer of the UE.

[0120] Example 3: When the UE receives data transmitted as indicated by the DCI from the base station (or AP), it is determined that the CPE policy is invalid, or does not indicate the CPE policy or a specific indication value;

[0121] The RRC message received by the UE from the base station (or AP) indicates the configured semi-static resources (configured grant) that the UE can use, but the CPE policy corresponding to the resource is empty (invalid), or has no indication, or has a specific indication value.

[0122] In the above indication situation, the UE selects the CPE starting position based on monitoring the resource usage of other UEs. If the UE monitors that the resources reserved by other UEs are in the same slot as the resources indicated by its own DCI or RRC, the UE selects the configured or pre-configured default CPE starting position. Otherwise, the UE randomly selects a CPE starting position from the following CPE starting position set, where the starting position set includes at least one of the following:

[0123] The set of CPEs available in the current resource pool;

[0124] The set of available CPEs corresponding to the current data priority in the current resource pool;

[0125] The set of available CPEs corresponding to the current channel access priority (CAPC) in the current resource pool;

[0126] The current resource pool can use a CPE starting position corresponding to the current data priority in the CPE set;

[0127] The current resource pool may use a CPE starting position corresponding to the current channel access priority in the CPE set.

[0128] The UE determines the CPE location according to the above strategy. When the UE accesses a channel, including using a Type 1 access channel or a Type 2A / 2B / 2C access channel, it attempts channel access based on the determined CPE location.

[0129] In one embodiment, the UE may determine a CPE selection strategy based on an RSRP threshold value. The UE selects a CPE starting position based on monitoring resource usage of other UEs. If the UE monitors resources reserved by other UEs, and if the resources indicated by its DCI or RRC or the resources selected by itself or the reselected resources are in the same slot as the resources reserved by other UEs, but the resources do not overlap, the UE uses a configured or pre-configured default CPE starting position.

[0130] If the resources indicated by its DCI or RRC or the resources selected by itself or the reselected resources are in the same slot as the resources reserved by other UEs, and the resources are overlapping, but the RSRP of the resources reserved by other UEs is lower than an RSRP threshold, the UE selects the configured or preconfigured default CPE starting position;

[0131] Otherwise, the UE randomly selects a CPE starting position from the following CPE starting position set, where the starting position set includes at least one of the following:

[0132] The set of CPEs available in the current resource pool;

[0133] The set of available CPEs corresponding to the current data priority in the current resource pool;

[0134] The set of available CPEs corresponding to the current channel access priority (CAPC) in the current resource pool;

[0135] The current resource pool can use a CPE starting position corresponding to the current data priority in the CPE set;

[0136] The current resource pool may use a CPE starting position corresponding to the current channel access priority in the CPE set.

[0137] The above UE policy determines the CPE location. When the UE accesses a channel, including using a Type 1 access channel or a Type 2A / 2B / 2C access channel, it attempts channel access based on the determined CPE location.

[0138] In one embodiment, the UE may determine a CPE selection strategy based on an RSRP threshold value and a channel access type. When the channel access type is type 2, or type 2A / 2B / 2C, the UE selects a configured or pre-configured default CPE starting position. When the channel access type is type 1, the UE selects a CPE starting position based on monitoring resource usage of other UEs. If the UE monitors resources reserved by other UEs, and if the resources indicated by its DCI or RRC, or the resources selected by itself, or the reselected resources are in the same slot as the resources reserved by other UEs, but the resources do not overlap, the UE uses the configured or pre-configured default CPE starting position.

[0139] If the resources indicated by its DCI or RRC or the resources selected by itself or the reselected resources are in the same slot as the resources reserved by other UEs, and the resources are overlapping, but the RSRP of the resources reserved by other UEs is lower than an RSRP threshold, the UE selects the configured or preconfigured default CPE starting position;

[0140] Otherwise, the UE randomly selects a CPE starting position from the following CPE starting position set, where the starting position set includes at least one of the following:

[0141] The set of CPEs available in the current resource pool;

[0142] The set of available CPEs corresponding to the current data priority in the current resource pool;

[0143] The set of available CPEs corresponding to the current channel access priority (CAPC) in the current resource pool;

[0144] The current resource pool can use a CPE starting position corresponding to the current data priority in the CPE set;

[0145] The current resource pool may use a CPE starting position corresponding to the current channel access priority in the CPE set.

[0146] The UE determines the CPE location according to the above strategy. When the UE accesses a channel, including using a Type 1 access channel or a Type 2A / 2B / 2C access channel, it attempts channel access based on the determined CPE location.

[0147] In one embodiment, the UE may determine a CPE selection strategy based on the channel access type. When the channel access type is type 2, or type 2A / 2B / 2C, the UE selects a configured or preconfigured default CPE starting position. When the channel access type is type 1, the UE selects a CPE starting position based on monitoring resource usage of other UEs. If the UE monitors resources reserved by other UEs, and if the resources indicated by its DCI or RRC, or the resources selected by itself, or the reselected resources are in the same slot as the resources reserved by other UEs, the UE uses the configured or preconfigured default CPE starting position.

[0148] If the resources indicated by its DCI or RRC, or the resources selected by itself, or the reselected resources are not in the same slot as the resources reserved by other UEs, the UE randomly selects a CPE starting position from the following CPE starting position set, where the starting position set includes at least one of the following:

[0149] The set of CPEs available in the current resource pool;

[0150] The set of available CPEs corresponding to the current data priority in the current resource pool;

[0151] The set of available CPEs corresponding to the current channel access priority (CAPC) in the current resource pool;

[0152] The current resource pool can use a CPE starting position corresponding to the current data priority in the CPE set;

[0153] The current resource pool may use a CPE starting position corresponding to the current channel access priority in the CPE set.

[0154] The UE determines the CPE location according to the above strategy. When the UE accesses a channel, including using a Type 1 access channel or a Type 2A / 2B / 2C access channel, it attempts channel access based on the determined CPE location.

[0155] In one embodiment, FIG6 is a block diagram of a channel access apparatus provided in an embodiment of the present application. This embodiment is applied to a first communication device. As shown in FIG6 , the channel access apparatus in this embodiment includes: a receiver 410 and a determination module 420.

[0156] The receiver 410 is configured to receive resource indication information indicated by the second communication device and carrying at least a cyclic prefix extension CPE selection policy.

[0157] The determination module 420 is configured to determine the starting position of the CPE according to the CPE selection policy.

[0158] In one embodiment, the CPE selection strategy includes at least one of the following:

[0159] Use the default CPE starting position of the current resource pool;

[0160] Randomly select a CPE starting position from the set of available CPEs in the current resource pool;

[0161] Select a CPE starting position corresponding to the current data priority from the available CPE set in the current resource pool;

[0162] Select a CPE starting position from the set of available CPEs corresponding to the current data priority of the current resource pool;

[0163] Select a CPE starting position corresponding to the current channel access priority from the available CPE set in the current resource pool;

[0164] A CPE starting position is selected from the available CPE set corresponding to the current channel access priority of the current resource pool.

[0165] In one embodiment, the resource indication information includes at least one of the following: physical layer dynamic indication information; and high layer indication information.

[0166] In one embodiment, when the CPE selection policy carried in the resource indication information is invalid, the resource indication information does not carry the CPE selection policy, or the CPE selection policy corresponds to a specific indication value, the corresponding CPE starting position is selected according to the resource usage of other first communication devices.

[0167] In one embodiment, selecting a corresponding CPE starting position according to resource usage of other first communication devices includes:

[0168] When the reserved communication resources of the other first communication devices and the communication resources indicated by the resource indication information are in the same time slot, selecting a default CPE starting position;

[0169] When the reserved communication resources of other first communication devices and the communication resources indicated by the resource indication information are not in the same time slot, a CPE starting position is selected from a pre-configured CPE starting position set.

[0170] In one embodiment, when the CPE selection policy carried in the resource indication information is invalid, the resource indication information does not carry the CPE selection policy, or the CPE selection policy corresponds to a specific indication value, the corresponding CPE starting position is selected according to the resource usage and channel access type of other first communication devices; wherein the channel access type includes one of the following: Type 1, Type 2, Type 2A, Type 2B, Type 2C.

[0171] In one embodiment, selecting the corresponding CPE starting position according to resource usage and channel access type of other first communication devices includes:

[0172] When the channel access type for current data transmission is type 1, select one of the following:

[0173] When the reserved communication resources of the other first communication devices and the communication resources indicated by the resource indication information are in the same time slot, selecting a default CPE starting position;

[0174] When the reserved communication resources of the other first communication devices and the communication resources indicated by the resource indication information are not in the same time slot, selecting a CPE starting position from a pre-configured CPE starting position set;

[0175] When the channel access type for current data transmission is type 2, or type 2A / 2B / 2C, select the default CPE starting position.

[0176] In one embodiment, the CPE starting location set includes at least one of the following:

[0177] The set of available CPEs in the current resource pool;

[0178] The set of available CPEs corresponding to the current data priority of the current resource pool;

[0179] The available CPE set corresponding to the current channel access priority of the current resource pool.

[0180] The current resource pool can use a CPE starting position corresponding to the current data priority in the CPE set;

[0181] The current resource pool may use a CPE starting position corresponding to the current channel access priority in the CPE set.

[0182] In one embodiment, the resource indication information is further used to indicate the data priority or channel access priority on the currently authorized resources.

[0183] In one embodiment, the resource indication information is further used to indicate the channel access type on the currently authorized resources, including one of the following: Type 1, Type 2, Type 2A, Type 2B, Type 2C.

[0184] In one embodiment, the CPE selection strategy occupies at least one bit in the resource indication information.

[0185] The channel access device provided in this embodiment is configured to implement the channel access method applied to the first communication device in the embodiment shown in FIG2 . The implementation principle and technical effects of the channel access device provided in this embodiment are similar and will not be repeated here.

[0186] In one embodiment, FIG7 is a block diagram of another channel access device provided in an embodiment of the present application. This embodiment is applied to a first communication device. As shown in FIG7 , the channel access device in this embodiment includes: a receiver 510 and a selection module 520.

[0187] The receiver 510 is configured to receive resource indication information sent by the second communication device.

[0188] The selection module 520 is configured to select a CPE starting position according to resource usage of other first communication devices and the communication resources indicated by the resource indication information.

[0189] In one embodiment, selecting the CPE starting position based on resource usage of other first communication devices and the communication resources indicated by the resource indication information includes at least one of the following:

[0190] When the reserved communication resources of the other first communication devices and the communication resources indicated by the resource indication information are in the same time slot and the resources do not overlap, selecting a default CPE starting position;

[0191] When the reserved communication resources of the other first communication devices and the communication resources indicated by the resource indication information are in the same time slot and the resources overlap, and the reference signal received power RSRP value of the reserved communication resources of the other first communication devices is lower than the preset RSRP threshold value, selecting the default CPE starting position;

[0192] When the reserved communication resources of other first communication devices and the communication resources indicated by the resource indication information are in the same time slot, the resources overlap, and the RSRP value of the reserved resources is higher than the preset RSRP threshold value, a CPE starting position is selected from the pre-configured CPE starting position set.

[0193] In one embodiment, the CPE starting location set includes at least one of the following:

[0194] The set of available CPEs in the current resource pool;

[0195] The set of available CPEs corresponding to the current data priority of the current resource pool;

[0196] The available CPE set corresponding to the current channel access priority of the current resource pool.

[0197] The current resource pool can use a CPE starting position corresponding to the current data priority in the CPE set;

[0198] The current resource pool may use a CPE starting position corresponding to the current channel access priority in the CPE set.

[0199] The channel access device provided in this embodiment is configured to implement the channel access method applied to the first communication device in the embodiment shown in FIG3 . The implementation principle and technical effects of the channel access device provided in this embodiment are similar and will not be repeated here.

[0200] In one embodiment, FIG8 is a block diagram of another channel access apparatus provided in an embodiment of the present application. This embodiment is applied to a second communication device. As shown in FIG8 , the channel access apparatus in this embodiment includes: an indication module 610.

[0201] The indication module 610 is configured to indicate to the first communication device the resource indication information at least carrying the cyclic prefix extension CPE selection policy, so that the first communication device determines the starting position of the CPE according to the CPE selection policy.

[0202] In one embodiment, the CPE selection strategy includes at least one of the following:

[0203] Use the default CPE starting position of the current resource pool;

[0204] Randomly select a CPE starting position from the set of available CPEs in the current resource pool;

[0205] Select a CPE starting position corresponding to the current data priority from the available CPE set in the current resource pool;

[0206] Select a CPE starting position from the set of available CPEs corresponding to the current data priority of the current resource pool;

[0207] Select a CPE starting position corresponding to the current channel access priority from the available CPE set in the current resource pool;

[0208] A CPE starting position is selected from the available CPE set corresponding to the current channel access priority of the current resource pool.

[0209] In one embodiment, the resource indication information includes at least one of the following: physical layer dynamic indication information; and high layer indication information.

[0210] In one embodiment, the resource indication information is further used to indicate the data priority or channel access priority on the currently authorized resources.

[0211] In one embodiment, the resource indication information is further used to indicate the channel access type on the currently authorized resources, including one of the following: Type 1, Type 2, Type 2A, Type 2B, Type 2C.

[0212] In one embodiment, the CPE selection strategy occupies at least one bit in the resource indication information.

[0213] The channel access device provided in this embodiment is configured to implement the channel access method applied to the second communication device in the embodiment shown in FIG4 . The implementation principle and technical effects of the channel access device provided in this embodiment are similar and will not be repeated here.

[0214] In one embodiment, Figure 9 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. As shown in Figure 9, the device provided in the present application includes: a processor 710, a memory 720, and a communication interface 730. The number of processors 710 in the device can be one or more, and Figure 9 uses one processor 710 as an example. The number of memories 720 in the device can be one or more, and Figure 9 uses one memory 720 as an example. The processor 710, memory 720, and communication interface 730 of the device can be connected via a bus or other means, and Figure 9 uses a bus connection as an example. In this embodiment, the device can be a first communication device.

[0215] The memory 720, as a computer-readable storage medium, can be configured to store software programs, computer executable programs, and modules, such as program instructions / modules corresponding to the device of any embodiment of the present application (for example, the receiver 410 and the determination module 420 in the channel access device). The memory 720 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and applications required for at least one function; the data storage area may store data created based on the use of the device, etc. In addition, the memory 720 may include a high-speed random access memory and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 720 may further include a memory remotely located relative to the processor 710, and these remote memories may be connected to the device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof. Among them, the communication interface 730 is used to implement communication interaction between multiple communication devices.

[0216] In the case where the communication device is a first communication device, the device provided above can be configured to execute the channel access method applied to the first communication device provided in any of the above embodiments, and have corresponding functions and effects.

[0217] In the case where the communication device is a second communication device, the device provided above can be configured to execute the channel access method applied to the second communication device provided in any of the above embodiments, and have corresponding functions and effects.

[0218] An embodiment of the present application also provides a storage medium containing computer-executable instructions, which, when executed by a computer processor, are used to execute a channel access method applied to a first communication device, the method comprising: receiving resource indication information indicated by a second communication device and carrying at least a cyclic prefix extended CPE selection policy; and determining the starting position of the CPE according to the CPE selection policy.

[0219] An embodiment of the present application also provides a storage medium containing computer-executable instructions, which, when executed by a computer processor, are used to execute a channel access method applied to a first communication device, the method comprising: receiving resource indication information sent by a second communication device; and selecting a CPE starting position based on the resource usage of other first communication devices and the communication resources indicated by the resource indication information.

[0220] An embodiment of the present application also provides a storage medium containing computer-executable instructions, which, when executed by a computer processor, are used to execute a channel access method applied to a second communication device, the method comprising: indicating to a first communication device resource indication information that at least carries a cyclic prefix extended CPE selection policy, so that the first communication device determines the starting position of the CPE according to the CPE selection policy.

[0221] It will be appreciated by those skilled in the art that the term user equipment encompasses any suitable type of wireless user equipment, such as a mobile phone, a portable data processing device, a portable web browser or a car-mounted mobile station.

[0222] In general, various embodiments of the present application may be implemented in hardware or dedicated circuits, software, logic, or any combination thereof. For example, some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software that can be executed by a controller, microprocessor, or other computing device, although the present application is not limited thereto.

[0223] Embodiments of the present application may be implemented by executing computer program instructions by a data processor of a mobile device, for example, in a processor entity, or by hardware, or by a combination of software and hardware. The computer program instructions may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages.

[0224] The block diagram of any logic flow in the drawings of the present application may represent program steps, or may represent interconnected logic circuits, modules and functions, or may represent a combination of program steps and logic circuits, modules and functions. A computer program may be stored on a memory. The memory may be of any type suitable for the local technical environment and may be implemented using any suitable data storage technology, such as, but not limited to, read-only memory (ROM), random access memory (RAM), optical storage devices and systems (digital versatile discs (DVD) or compact disks (CD)), etc. Computer-readable media may include non-transient storage media. A data processor may be of any type suitable for the local technical environment, such as, but not limited to, a general-purpose computer, a special-purpose computer, a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), and a processor based on a multi-core processor architecture.

[0225] The above are merely optional embodiments of the present application and are not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A channel access method, applied to a first communication device, comprising: Receiving resource indication information indicating at least a cyclic prefix extension CPE selection strategy indicated by a second communication device; The starting position of the CPE is determined according to the CPE selection strategy.

2. The method according to claim 1, wherein: The CPE selection strategy includes at least one of the following: Use the default CPE start position of the current resource pool; Randomly select a CPE starting position from the available CPE set in the current resource pool; Select a CPE starting position corresponding to the current data priority from the available CPE set in the current resource pool; Select a CPE starting position from the available CPE set corresponding to the current data priority of the current resource pool; Select a CPE starting position corresponding to the current channel access priority from the available CPE set in the current resource pool; A CPE starting position is selected from the available CPE set corresponding to the current channel access priority of the current resource pool.

3. The method according to claim 1, wherein: The resource indication information includes at least one of the following: physical layer dynamic indication information; high-layer indication information.

4. The method according to claim 1, wherein: When the CPE selection policy carried in the resource indication information is invalid, the resource indication information does not carry the CPE selection policy, or the CPE selection policy corresponds to a specific indication value, the corresponding CPE starting position is selected according to resource usage of other first communication devices.

5. The method according to claim 4, wherein: The selecting a corresponding CPE starting position according to resource usage of other first communication devices includes: When the reserved communication resources of other first communication devices and the communication resources indicated by the resource indication information are in the same time slot, selecting a default CPE starting position; When the reserved communication resources of other first communication devices and the communication resources indicated by the resource indication information are not in the same time slot, a CPE starting position is selected from a pre-configured CPE starting position set.

6. The method according to claim 1, wherein: When the CPE selection strategy carried in the resource indication information is invalid, the resource indication information does not carry the CPE selection strategy, or the CPE selection strategy corresponds to a specific indication value, the corresponding CPE starting position is selected according to the resource usage and channel access type of other first communication devices; wherein the channel access type includes one of the following: Type 1, Type 2, Type 2A, Type 2B, Type 2C.

7. The method according to claim 6, wherein: The selecting a corresponding CPE starting position according to resource usage and channel access type of other first communication devices includes: When the channel access type of the current data transmission is type 1, select based on one of the following: When the reserved communication resources of other first communication devices and the communication resources indicated by the resource indication information are in the same time slot, selecting a default CPE starting position; When the reserved communication resources of the other first communication devices and the communication resources indicated by the resource indication information are not in the same time slot, selecting a CPE starting position from a pre-configured CPE starting position set; When the channel access type of the current data transmission is type 2, or type 2A / 2B / 2C, select the default CPE starting position.

8. The method according to claim 5 or 7, wherein: The CPE starting position set includes at least one of the following: The set of available CPEs in the current resource pool; The available CPE set corresponding to the current data priority of the current resource pool; The available CPE set corresponding to the current channel access priority of the current resource pool; The current resource pool may use a CPE starting position corresponding to the current data priority in the CPE set; The current resource pool may use a CPE starting position corresponding to the current channel access priority in the CPE set.

9. The method according to claim 1, wherein: The resource indication information is also used to indicate the data priority or channel access priority on the currently authorized resources.

10. The method according to claim 1, wherein: The resource indication information is also used to indicate the channel access type on the currently authorized resources, including one of the following: Type 1, Type 2, Type 2A, Type 2B, Type 2C.

11. The method according to any one of claims 1 to 7, wherein: The CPE selection strategy occupies at least one bit in the resource indication information.

12. A channel access method, applied to a first communication device, comprising: Receiving resource indication information sent by the second communication device; The CPE starting position is selected according to the resource usage of other first communication devices and the communication resources indicated by the resource indication information.

13. The method according to claim 12, wherein: The selecting the CPE starting position according to the resource usage of other first communication devices and the communication resources indicated by the resource indication information includes at least one of the following: When the reserved communication resources of the other first communication devices and the communication resources indicated by the resource indication information are in the same time slot and the resources do not overlap, selecting a default CPE starting position; When the reserved communication resources of the other first communication devices and the communication resources indicated by the resource indication information are in the same time slot and the resources overlap, and the reference signal received power RSRP value of the reserved communication resources of the other first communication devices is lower than the preset RSRP threshold value, selecting a default CPE starting position; When the reserved communication resources of other first communication devices and the communication resources indicated by the resource indication information are in the same time slot, the resources overlap, and the RSRP value of the reserved resources is higher than the preset RSRP threshold value, a CPE starting position is selected from the pre-configured CPE starting position set.

14. The method according to claim 13, wherein: The CPE starting position set includes at least one of the following: The set of available CPEs in the current resource pool; The available CPE set corresponding to the current data priority of the current resource pool; The available CPE set corresponding to the current channel access priority of the current resource pool; The current resource pool may use a CPE starting position corresponding to the current data priority in the CPE set; The current resource pool may use a CPE starting position corresponding to the current channel access priority in the CPE set.

15. A channel access method, applied to a second communication device, comprising: Indicate resource indication information at least carrying a cyclic prefix extension CPE selection policy to the first communication device, so that the first communication device determines the starting position of the CPE according to the CPE selection policy.

16. The method according to claim 15, wherein: The CPE selection strategy includes at least one of the following: Use the default CPE start position of the current resource pool; Randomly select a CPE starting position from the available CPE set in the current resource pool; Select a CPE starting position corresponding to the current data priority from the available CPE set in the current resource pool; Select a CPE starting position from the available CPE set corresponding to the current data priority of the current resource pool; Select a CPE starting position corresponding to the current channel access priority from the available CPE set in the current resource pool; Select one from the available CPE set corresponding to the current channel access priority of the current resource pool CPE start position.

17. A communication device comprising: memory, and at least one processor; The memory is configured to store at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the method as described in any one of claims 1-11, 12-14 or 15-16.

18. A storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the method according to any one of claims 1 to 11, 12 to 14 or 15 to 16.

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