# US 12,193,068 B2 · Access control method and device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,193,068 B2 - Document ID: US12193068B2 - Status: Granted - Kind: B2 - Application number: 17/746,765 - Filed: 2022-05-17 - Published: 2022-09-01 - Granted: 2025-01-07 - Earliest claimed: 2019-11-17 - Assignees: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Applicants: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Inventors: Zuomin Wu - Web page: https://patentgrep.com/patent/US12193068B2 ## CPC - H04W 74/004: {in the uplink, i.e. towards network} - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 16/14: Spectrum sharing arrangements {between different networks} - 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 Embodiments of the present disclosure provide an access control method and device. The method comprises: obtaining a RO resource for PRACH transmission and a PO resource for Msg A PUSCH transmission on the channel (Step S1001); determining a first channel access procedure for PRACH transmission and a second channel access procedure for Msg A PUSCH transmission (Step S1002), wherein the first channel access procedure comprises: a channel access procedure to initiate a first COT; or, a channel access procedure to share a second COT initiated by a network device, if the RO resource is within the second COT. ## Claims ### Claim 1 A method of accessing to a channel in shared spectrum, comprising: obtaining, by a terminal device, a random access channel (RACH) occasion (RO) resource for physical random access channel (PRACH) transmission and a physical uplink shared channel (PUSCH) occasion (PO) resource for Message A (Msg A) PUSCH transmission on the channel; and determining, by the terminal device, a first channel access procedure for PRACH transmission and a second channel access procedure for Msg A PUSCH transmission, wherein the first channel access procedure comprises: a channel access procedure to initiate a first channel occupancy time (COT); or, a channel access procedure to share a second COT initiated by a network device, if the RO resource is within the second COT, wherein the second channel access procedure comprises a channel access procedure to share the first COT initiated by the terminal device, if the PO resource is within the first COT, and wherein that the PO resource is within the first COT comprises: the RO resource and the PO resource are within the maximum channel occupancy time (MCOT) corresponding to the first COT. ### Claim 2 (depends on 1) The method according to claim 1, wherein the first channel access procedure comprises Type 1 channel access procedure with a first uplink channel access priority class (UL CAPC) p1 to initiate the first COT. ### Claim 3 (depends on 2) The method according to claim 2, wherein the first UL CAPC p1=1. ### Claim 4 (depends on 1) The method according to claim 1, wherein the first channel access procedure comprises Type 2A channel access procedure to share the second COT initiated by the network device, if the RO resource is within the second COT. ### Claim 5 (depends on 1) The method according to claim 1, wherein the second channel access procedure comprises Type 1 channel access procedure with a second UL CAPC p2, if the RO resource and the PO resource are within a same LBT subband of the channel in frequency domain and a time duration between the RO resource and the PO resource is more than or equal to a first value, or the RO resource and the PO resource are within different LBT subbands of the channel in frequency domain. ### Claim 6 (depends on 5) The method according to claim 5, wherein the second UL CAPC p2=1, or the second UL CAPC p2 is determined according to the service associated with the Msg A. ### Claim 7 (depends on 1) The method according to claim 1, wherein the second channel access procedure comprises Type 2A channel access procedure to share the second COT, if the PO resource is within the second COT. ### Claim 8 (depends on 1) The method according to claim 1, wherein the second channel access procedure comprises Type 2A channel access procedure, if the RO resource and the PO resource are within a same LBT subband of the channel in frequency domain and a time duration between the RO resource and the PO resource is more than or equal to a second value, wherein the second channel access procedure comprises Type 2B channel access procedure, if the RO resource and the PO resource are within a same LBT subband of the channel in frequency domain and a time duration between the RO resource and the PO resource is more than or equal to a third value and less than a second value, or wherein the second channel access procedure comprises Type 2C channel access procedure, if the RO resource and the PO resource are within a same LBT subband of the channel in frequency domain and a time duration between the RO resource and the PO resource is less than or equal to a third value. ### Claim 9 (depends on 1) The method according to claim 1, wherein the first channel access procedure comprises the channel access procedure to initiate the first COT, if the RO resource is configured from the beginning of the first COT, wherein the first COT corresponds to a first periodic channel occupancy on the channel, and the first periodic channel occupancy is configured to be initiated by the terminal device, or wherein the first channel access procedure comprises the channel access procedure to share the second COT initiated by the network device, if the RO resource is within the second COT, wherein the second COT corresponds to a second periodic channel occupancy on the channel, and the second periodic channel occupancy is configured to be initiated by the network device. ### Claim 10 (depends on 9) The method according to claim 9, wherein the first or second channel access procedure to initiate a COT, comprises: sensing the channel, by the terminal device, for at least a sensing slot duration of a fourth value; and performing transmission, by the terminal device, immediately after sensing the channel to be idle; or not performing transmission, by the terminal device, if the channel is sensed to be busy. ### Claim 11 (depends on 9) The method according to claim 9, wherein the first or second channel access procedure to share a COT, comprises: sensing the channel, by the terminal device, for at least a sensing slot duration of a fifth value; and performing uplink transmission, by the terminal device, immediately after sensing the channel to be idle; or not performing the uplink transmission, by the terminal device, if the channel is sensed to be busy, wherein the uplink transmission comprises PRACH transmission and/or Msg A PUSCH transmission. ### Claim 12 (depends on 11) The method according to claim 11, wherein a time duration between the uplink transmission and the previous transmission within the same COT is more than or equal to a sixth value. ### Claim 13 (depends on 9) The method according to claim 9, wherein the first or second channel access procedure to share a COT, comprises: performing uplink transmission, by the terminal device, without sensing the channel, wherein the uplink transmission comprises PRACH transmission and/or Msg A PUSCH transmission. ### Claim 14 (depends on 13) The method according to claim 13, wherein a time duration between the uplink transmission and the previous transmission within the same COT is less than or equal to a sixth value. ### Claim 15 (depends on 9) The method according to claim 9, wherein the RO resource and the PO resource are within a same LBT subband of the channel in frequency domain. ### Claim 16 (depends on 9) The method according to claim 9, wherein the terminal device is configured with semi-static channel access. ### Claim 17 (depends on 1) The method according to claim 1, wherein the second channel access procedure comprises a channel access procedure to initiate a third COT, if the PO resource is configured from the beginning of the third COT, wherein the third COT corresponds to a third periodic channel occupancy on the channel, and the third periodic channel occupancy is configured to be initiated by the terminal device, or wherein the second channel access procedure comprises the channel access procedure to share the second COT initiated by the network device, if the PO resource is within the second COT, wherein the second COT corresponds to a second periodic channel occupancy on the channel, and the second periodic channel occupancy is configured to be initiated by the network device, or wherein the second channel access procedure comprises a channel access procedure to share the first COT initiated by the terminal device, if the PO resource is within the first COT, wherein the first COT corresponds to a first periodic channel occupancy on the channel, and the first periodic channel occupancy is configured to be initiated by the terminal device. ### Claim 18 (depends on 1) The method according to claim 1, further comprising: determining, by the terminal device, the first channel access procedure comprises either the channel access procedure to initiate the first COT or the channel access procedure to share a second COT according to a configuration from the network or a predefined rule. ### Claim 19 A terminal device, comprising: a processor; a memory configured to store instructions executable by the processor, wherein the processor is configured to execute operations comprising: obtaining a random access channel (RACH) occasion (RO) resource for physical random access channel (PRACH) transmission and a physical uplink shared channel (PUSCH) occasion (PO) resource for Message A (Msg A) PUSCH transmission on the channel; and determining a first channel access procedure for PRACH transmission and a second channel access procedure for Msg A PUSCH transmission, wherein the first channel access procedure comprises: a channel access procedure to initiate a first channel occupancy time (COT); or, a channel access procedure to share a second COT initiated by a network device, if the RO resource is within the second COT, wherein the second channel access procedure comprises a channel access procedure to share the first COT initiated by the terminal device, if the PO resource is within the first COT, and wherein that the PO resource is within the first COT comprises: the RO resource and the PO resource are within the maximum channel occupancy time (MCOT) corresponding to the first COT.