# US 11,310,776 B2 · Sensing and resource selection for sidelink grant-free transmissions > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,310,776 B2 - Document ID: US11310776B2 - Status: Granted - Kind: B2 - Application number: 15/930,671 - Filed: 2020-05-13 - Published: 2020-11-19 - Granted: 2022-04-19 - Earliest claimed: 2019-05-13 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Amine Maaref; Yu Cao; Jianglei Ma - Web page: https://patentgrep.com/patent/US11310776B2 ## CPC - H04W 72/20: Control channels or signalling for resource management - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 72/52: based on load - H04W 72/542: using measured or perceived quality - H04W 4/40: for vehicles, e.g. vehicle-to-pedestrians [V2P] - H04W 92/18: between terminal devices - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Resource usage information is determined at a first UE about usage of a first communication resource by other UEs based on signals received by the UE. The first communication resource is excluded from a set of candidate communication resources when the resource usage information exceeds a usage threshold. When the first communication resource is excluded, a second communication resource from the candidate communication resources remaining in the set is selected to use for a transmission by the UE. ## Claims ### Claim 1 A method comprising: determining, by a first user equipment device (UE), resource usage information about usage of a first communication resource by second UEs based on signals received by the first UE, wherein the resource usage information includes a number of the second UEs using the first communication resource; excluding the first communication resource from a set of candidate communication resources based at least on the number of the second UEs using the first communication resource of the resource usage information exceeding a threshold number of the second UEs of a usage threshold, the threshold number being at least two; and selecting, by the first UE, when the first communication resource is excluded, a second communication resource from remaining candidate communication resources remaining in the set of candidate communication resources to use for a transmission by the first UE. ### Claim 2 (depends on 1) The method of claim 1, wherein the first communication resource corresponds to a communication channel, the determining the resource usage information further comprising: measuring received signal power for the communication channel, wherein the usage threshold is also based on the received signal power measured by the first UE exceeding a threshold received signal power, wherein the first communication resource is excluded from the set of candidate communication resources when the number of the second UEs using the first communication resource exceeds the threshold number of the second UEs and the received signal power measured by the first UE exceeds the threshold received signal power. ### Claim 3 (depends on 2) The method of claim 2, wherein the received signal power is measured in respect of reference signals transmitted by the second UEs. ### Claim 4 (depends on 3) The method of claim 3, wherein the communication channel is a physical sidelink shared channel (PSSCH), and the reference signals are demodulation reference signals (DMRS). ### Claim 5 (depends on 1) The method of claim 1, wherein determining the number of the second UEs using the first communication resource comprises determining a number of control signals, received by the first UE over a control channel, from the second UEs that indicate the first communication resource. ### Claim 6 (depends on 5) The method of claim 5, wherein the control channel is a physical sidelink control channel (PSCCH) and the control signals are sidelink control information (SCI). ### Claim 7 (depends on 1) The method of claim 1, wherein determining the number of the second UEs using the first communication resource comprises determining a number of reference signals, received by the first UE over a data channel, from the second UEs that indicate the first communication resource. ### Claim 8 (depends on 7) The method of claim 7, wherein the data channel is a physical sidelink shared channel (PSSCH), the first communication resource and the second communication resource define respective resources for the PSSCH, and the reference signals are demodulation reference signals (DMRSs). ### Claim 9 (depends on 1) The method of claim 1, wherein the first communication resource is excluded from the set of candidate communication resources when the number of the second UEs using the first communication resource exceeds the threshold number of the second UEs. ### Claim 10 A first user equipment (UE) comprising: at least one processor; and a memory coupled to the at least one processor and storing instructions, that when executed by the at least one processor, cause the first UE to: determine resource usage information about usage of a first communication resource by second UEs based on signals received by the first UE, wherein the resource usage information includes a number of the second UEs using the first communication resource; exclude the first communication resource from a set of candidate communication resources based at least on the number of the second UEs using the first communication resource of the resource usage information exceeding a threshold number of the second UEs of a usage threshold, the threshold number being at least two; and select, when the first communication resource is excluded, a second communication resource from remaining candidate communication resources remaining in the set of candidate communication resources to use for a transmission by the first UE. ### Claim 11 (depends on 10) The first UE of claim 10, wherein the first communication resource corresponds to a communication channel, and wherein the instructions further cause the first UE to: measure, as part of the resource usage information, received signal power for the communication channel; and exclude the first communication resource from the set of candidate communication resources when the number of the second UEs using the first communication resource exceeds the threshold number of the second UEs and the received signal power measured by the first UE exceeds a threshold received signal power. ### Claim 12 (depends on 11) The first UE claim 11, wherein the received signal power is measured in respect of a plurality of reference signals transmitted by the second UEs. ### Claim 13 (depends on 12) The first UE of claim 12, wherein the communication channel is a physical sidelink shared channel (PSSCH), and the reference signals are demodulation reference signals (DMRS). ### Claim 14 (depends on 10) The first UE of claim 10, wherein the number of the second UEs using the first communication resource is determined by: determining a number of control signals, received by the first UE over a control channel, from the second UEs that indicate the first communication resource. ### Claim 15 (depends on 14) The first UE of claim 14, wherein the control channel is a physical sidelink control channel (PSCCH) and the control signals are sidelink control information (SCI). ### Claim 16 (depends on 10) The first UE of claim 10, wherein the number of the second UEs using the first communication resource is determined by: determining a number of reference signals, received by the first UE over a data channel, from the second UEs that indicate the first communication resource. ### Claim 17 (depends on 16) The first UE of claim 16, wherein the data channel is a physical sidelink shared channel (PSSCH), the first communication resource defines a resource for the PSSCH, and the reference signals are demodulation reference signals (DMRSs). ### Claim 18 A non-transitory computer-readable medium having instructions stored thereon that, when executed by a first user equipment device (UE), cause the first UE to perform operations, the operations comprising: determining resource usage information about usage of a first communication resource by second UEs based on signals received by the first UE, wherein the resource usage information includes a number of the second UEs using the first communication resource; excluding the first communication resource from a set of candidate communication resources based at least on the number of the second UEs using the first communication resource of the resource usage information exceeding a threshold number of the second UEs of a usage threshold, the threshold number being at least two; and selecting when the first communication resource is excluded, a second communication resource from remaining candidate communication resources remaining in the set of candidate communication resources to use for a transmission by the first UE.