# US 12,193,076 B2 · COT sharing indicator for message 3 in random access procedure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,193,076 B2 - Document ID: US12193076B2 - Status: Granted - Kind: B2 - Application number: 17/599,205 - Filed: 2020-03-24 - Published: 2022-08-11 - Granted: 2025-01-07 - Earliest claimed: 2020-03-24 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Min Wang - Web page: https://patentgrep.com/patent/US12193076B2 ## CPC - H04W 74/085: {collision avoidance} - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 74/002: {Transmission of channel access control information} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 74/0866: {using a dedicated channel for access} - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04W 74/0836: with 2-step access - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method of operating a user equipment, UE, in a wireless communication system includes receiving a first random access procedure message from a base station, the first random access procedure message containing a channel occupancy time, COT, sharing indicator that indicates a shared COT period associated with the first random access procedure message, and transmitting a second random access procedure message to the base station within the shared COT period. A method of operating a base station includes transmitting a first random access procedure message to a user equipment, UE, the first random access procedure message containing a channel occupancy time, COT, sharing indicator that indicates a shared COT period associated with the first random access procedure message, and receiving a second random access procedure message from the UE within the shared COT period. ## Claims ### Claim 1 A method of operating a user equipment, UE, in a wireless communication system, the method comprising: receiving a first random access procedure message from a base station, the first random access procedure message containing a channel access type field that indicates a channel access type used for transmitting the second random access procedure message during a shared channel occupancy time, COT, period associated with the first random access procedure message; and transmitting a second random access procedure message to the base station within the shared COT period; wherein the first random access procedure message further comprises a COT sharing indicator that indicates the shared COT period associated with the first random access procedure message, wherein the COT sharing indicator comprises one of: a bit that is reused from an existing uplink grant field, a bit that is reused from a medium access control, MAC, payload or a MAC subheader, or a bit that is reused from a timing advance command field. ### Claim 2 (depends on 1) The method of claim 1, wherein the COT sharing indicator comprises a COT sharing indicator bit indicating that the second random access procedure message can be transmitted within a current COT period. ### Claim 3 (depends on 1) The method of claim 1, wherein the COT sharing indicator comprises a channel access priority class field that indicates a channel access priority class associated with a channel access type that can be used for transmitting the second random access procedure message. ### Claim 4 (depends on 1) The method of claim 1, wherein the existing uplink grant field comprises an MCS field, a channel state information, CSI, request field or a physical uplink shared channel, PUSCH, frequency resource allocation field. ### Claim 5 (depends on 1) The method of claim 1, wherein the COT sharing indicator comprises a new field in an uplink grant message. ### Claim 6 (depends on 1) The method of claim 1, wherein the COT sharing indicator is transmitted in downlink control information, DCI, in a MAC control element, CE, or a radio resource control, RRC, signaling message. ### Claim 7 (depends on 1) The method of claim 1, wherein the channel access type field comprises two bits out of a physical uplink shared channel, PUSCH, resource allocation in an uplink grant field. ### Claim 8 A method of operating a base station, comprising transmitting a first random access procedure message to a user equipment, UE, the first random access procedure message containing a channel access type field that indicates a channel access type used for transmitting a second random access procedure message during a shared channel occupancy time, COT, period associated with the first random access procedure message; and receiving the second random access procedure message from the UE within the shared COT period; wherein the first random access procedure message comprises a channel occupancy time, COT, sharing indicator that indicates the shared COT period associated with the first random access procedure message, wherein the COT sharing indicator comprises: a bit that is reused from an existing uplink grant field, a bit that is reused from a medium access control, MAC, payload or a MAC subheader, or a bit that is reused from a timing advance command field. ### Claim 9 (depends on 8) The method of claim 8, wherein the COT sharing indicator comprises a COT sharing indicator bit indicating that the second random access procedure message can be transmitted within a current COT period. ### Claim 10 (depends on 8) The method of claim 8, wherein the COT sharing indicator comprises a channel access priority class field that indicates a channel access priority class associated with a channel access type that can be used for transmitting the second random access procedure message. ### Claim 11 (depends on 8) The method of claim 8, wherein the existing uplink grant field comprises an MCS field, a channel state information, CSI, request field or a physical uplink shared channel, PUSCH, frequency resource allocation field. ### Claim 12 (depends on 8) The method of claim 8, wherein the COT sharing indicator comprises a new field in an uplink grant message. ### Claim 13 (depends on 8) The method of claim 8, wherein the COT sharing indicator is transmitted in downlink control information, DCI, in a MAC control element, CE, or a radio resource control, RRC, signaling message. ### Claim 14 (depends on 8) The method of claim 8, wherein the channel access type field comprises two bits out of a physical uplink shared channel, PUSCH, resource allocation in an uplink grant field.