# US 12,016,052 B2 · Transmission of channel occupancy time-sharing information (COT-SI) reserving a COT for sidelink communications in unlicensed bands > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,016,052 B2 - Document ID: US12016052B2 - Status: Granted - Kind: B2 - Application number: 17/361,978 - Filed: 2021-06-29 - Published: 2022-12-29 - Granted: 2024-06-18 - Earliest claimed: 2021-06-29 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Xiaojie Wang; Jing Sun; Chih-Hao Liu; Yisheng Xue; Xiaoxia Zhang - Web page: https://patentgrep.com/patent/US12016052B2 ## CPC - H04W 74/002: {Transmission of channel access control information} - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04W 72/20: Control channels or signalling for resource management - H04W 72/25: between terminals via a wireless link, e.g. sidelink - H04W 72/40: Resource management for direct mode communication, e.g. D2D or sidelink - H04W 16/14: Spectrum sharing arrangements {between different networks} - H04W 76/14: Direct-mode setup - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Wireless communications systems and methods related to channel occupancy time-sharing information (COT-SI) reservation of a COT for sidelink communications in an unlicensed band are provided. In some aspects, a user equipment (UE) performs a channel access procedure to acquire one or more COTs in a sidelink channel over an unlicensed new radio (NR) band. Further, the UE transmits a COT sharing information (COT-SI) configured to reserve the one or more COTs for a future transmission via the sidelink channel. ## Claims ### Claim 1 A method of wireless communication performed by a user equipment (UE), the method comprising: performing a channel access procedure to acquire a current channel occupancy time (COT) and one or more future COTs in a sidelink channel over an unlicensed new radio (NR) band, wherein a number of the acquired COTs equals a difference between a maximum number of physical sidelink shared channel (PSSCH) reservations a first stage sidelink control information (SCI-1) is configured to reserve and a number of one or more PSSCH reservations that the SCI-1 is configured to reserve; transmitting, via the SCI-1, COT sharing information (COT-SI) indicating a structure of the current COT; and transmitting a plurality of physical sidelink shared channel (PSSCH) reservations, with a first subset of the plurality of PSSCH reservations in the current COT and a second subset of the plurality of PSSCH reservations in the one or more future COTs. ### Claim 2 (depends on 1) The method of claim 1, wherein the COT-SI is transmitted via the SCI-1 carried by a physical sidelink control channel (PSCCH) transmission. ### Claim 3 (depends on 2) The method of claim 2, wherein the SCI-1 includes a field having bit values configured to encode the COT-SI. ### Claim 4 (depends on 1) The method of claim 1, wherein the COT-SI is transmitted via second stage sidelink control information (SCI-2) carried by a physical sidelink shared channel (PSSCH) transmission. ### Claim 5 (depends on 1) The method of claim 1, wherein the sidelink channel includes: (a) a first subchannel having: (i) a first resource configured for a PSCCH transmission carrying the SCI-1, and (ii) a second resource configured for a first portion of a multi-channel PSSCH transmission, and (b) a second subchannel having: (i) a third resource configured for the transmitting the COT-SI, and (ii) a fourth resource configured for a second portion of the multi-channel PSSCH transmission, wherein the SCI-1 is configured to reserve the second resource in the first subchannel and the fourth resource in the second subchannel. ### Claim 6 (depends on 5) The method of claim 5, wherein the SCI-1 is configured to include information about the transmitting the COT-SI. ### Claim 7 (depends on 6) The method of claim 6, wherein the information includes an indication of at least one of a presence of the COT-SI at the third resource, or a location of the third resource in the sidelink channel. ### Claim 8 (depends on 5) The method of claim 5, wherein the COT-SI is configured to use a SCI-1 waveform. ### Claim 9 (depends on 5) The method of claim 5, wherein the first subchannel includes a fifth resource configured for transmitting second stage sidelink control information (SCI-2) without rate-matching the SCI-2 to the third resource. ### Claim 10 (depends on 1) The method of claim 1, wherein: the sidelink channel includes a first subchannel having a first resource configured for transmitting a PSCCH transmission carrying the SCI-1, the SCI-1 configured to reserve a second resource for a single-channel PSSCH transmission in the first subchannel; and the COT-SI is transmitted via a third resource in a second subchannel of the sidelink channel that is different from the first subchannel. ### Claim 11 (depends on 10) The method of claim 10, wherein the COT-SI is configured to have a same payload size as the SCI-1. ### Claim 12 (depends on 10) The method of claim 10, wherein the first subchannel includes a fifth resource configured for transmitting second stage sidelink control information (SCI-2) configured to reserve the third resource in the second subchannel. ### Claim 13 (depends on 12) The method of claim 12, wherein at least one of the SCI-1 or the SCI-2 include SCI signaling about the COT-SI configured to assist a second UE receiving the COT-SI with decoding the COT-SI. ### Claim 14 (depends on 13) The method of claim 13, wherein the SCI signaling includes at least one of information about a waveform of the COT-SI, a payload size of the COT-SI, or a field contained within the COT-SI related to the acquired COTs. ### Claim 15 (depends on 14) The method of claim 14, wherein at least one of: the waveform of the COT-SI is different from a waveform of the SCI-1; or the payload of the COT SI is different from a payload of the SCI-1. ### Claim 16 (depends on 1) The method of claim 1, wherein the COT-SI is transmitted via a dedicated physical sidelink channel of the sidelink channel that is configured to carry only COT-SI signals. ### Claim 17 (depends on 16) The method of claim 16, wherein the dedicated physical sidelink channel is located within a physical sidelink shared channel (PSSCH) of the sidelink channel, the location being at a last defined number symbols of the PSSCH, at a fixed location within the PSSCH, at any location within the PSSCH after a SCI-2 transmission is completed, or a combination thereof. ### Claim 18 (depends on 1) The method of claim 1, further comprising transmitting at least one of the SCI-1 or second stage sidelink control information (SCI-2) indicating a resource of the sidelink channel that is configured to transmit the COT-SI. ### Claim 19 (depends on 1) The method of claim 1, wherein the COT-SI is transmitted via a gap symbol or an automatic gain control (AGC) symbol of the sidelink channel. ### Claim 20 (depends on 19) The method of claim 19, wherein the sidelink channel includes a subchannel having the gap symbol, the AGC symbol, a first resource configured for transmitting the SCI-1, and a second resource configured for transmitting second stage sidelink control information (SCI-2), wherein at least one of the SCI-1 or the SCI-2 includes an indication that the COT-SI is transmitted via the gap symbol or the AGC symbol. ### Claim 21 A user equipment (UE), comprising: a memory; a transceiver; and at least one processor coupled to the memory and the transceiver, wherein the UE is configured to: perform a channel access procedure to acquire a current channel occupancy time (COT) and one or more future COTs in a sidelink channel over an unlicensed new radio (NR) band, wherein a number of the acquired COTs equals a difference between a maximum number of physical sidelink shared channel (PSSCH) reservations first stage sidelink control information (SCI-1) is configured to reserve and a number of one or more PSSCH reservations that the SCI-1 is configured to reserve; transmit, via the SCI-1, COT sharing information (COT-SI) indicating a structure of the current COT; and transmit a plurality of PSSCH reservations, with a first subset of the plurality of PSSCH reservations in the current COT and a second subset of the plurality of PSSCH reservations in the one or more future COTs. ### Claim 22 (depends on 21) The UE of claim 21, wherein the COT-SI is transmitted via at least one of the SCI-1 carried by a physical sidelink control channel (PSCCH) transmission or second stage sidelink control information (SCI-2) carried by a physical sidelink shared channel (PSSCH) transmission. ### Claim 23 (depends on 21) The UE of claim 21, wherein the sidelink channel includes: (a) a first subchannel having: (i) a first resource configured for a PSCCH transmission carrying the SCI-1, and (ii) a second resource configured for a first portion of a multi-channel PSSCH transmission, and (b) a second subchannel having: (i) a third resource configured for the transmitting the COT-SI, and (ii) a fourth resource configured for a second portion of the multi-channel PSSCH transmission, wherein the SCI-1 is configured to reserve the second resource in the first subchannel and the fourth resource in the second subchannel. ### Claim 24 (depends on 21) The UE of claim 21, wherein: the sidelink channel includes a first subchannel having a first resource configured for transmitting a PSCCH transmission carrying the SCI-1, the SCI-1 configured to reserve a second resource for a single-channel PSSCH transmission in the first subchannel; and the COT-SI is transmitted via a third resource in a second subchannel of the sidelink channel that is different from the first subchannel. ### Claim 25 (depends on 21) The UE of claim 21, wherein the COT-SI is transmitted via a dedicated physical sidelink channel of the sidelink channel that is configured to carry only COT-SI signals. ### Claim 26 (depends on 21) The UE of claim 21, wherein the UE is further configured to transmit at least one of the SCI-1 and/or second stage sidelink control information (SCI-2) indicating a resource of the sidelink channel that is configured to transmit the COT-SI. ### Claim 27 (depends on 21) The UE of claim 21, wherein the COT-SI is transmitted via a gap symbol or an automatic gain control (AGC) symbol of the sidelink channel. ### Claim 28 A non-transitory computer-readable medium (CRM) having program code recorded thereon, the program code comprising: code for causing a user equipment (UE) to perform a channel access procedure to acquire a current channel occupancy time (COT) and one or more future COTs in a sidelink channel over an unlicensed new radio (NR) band, wherein a number of the acquired COTs equals a difference between a maximum number of physical sidelink shared channel (PSSCH) reservations a first stage sidelink control information (SCI-1) is configured to reserve and a number of one or more PSSCH reservations that the SCI-1 is configured to reserve; code for causing the UE to transmit, via the SCI-1, COT sharing information (COT-SI) indicating a structure of the current COT; and code for causing the UE to transmit a plurality of PSSCH reservations, with a first subset of the plurality of PSSCH reservations in the current COT and a second subset of the plurality of PSSCH reservations in the one or more future COTs. ### Claim 29 A user equipment (UE), comprising: means for performing a channel access procedure to a current channel occupancy time (COT) and one or more future COTs in a sidelink channel over an unlicensed new radio (NR) band, wherein a number of the acquired COTs equals a difference between a maximum number of physical sidelink shared channel (PSSCH) reservations a first stage sidelink control information (SCI-1) is configured to reserve and a number of one or more PSSCH reservations that the SCI-1 is configured to reserve; means for transmitting, via the SCI-1, COT sharing information (COT-SI) indicating a structure of the current COT; and means for transmitting a plurality of PSSCH reservations, with a first subset of the plurality of PSSCH reservations in the current COT and a second subset of the plurality of PSSCH reservations in the one or more future COTs.