# US 12,764,579 B2 · Communication control method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,764,579 B2 - Document ID: US12764579B2 - Status: Granted - Kind: B2 - Application number: 18/410,461 - Filed: 2024-01-11 - Published: 2024-05-02 - Granted: 2026-10-13 - Earliest claimed: 2021-07-12 - Assignees: KYOCERA Corporation - Applicants: Kyocera Corporation - Inventors: Masato Fujishiro - Web page: https://patentgrep.com/patent/US12764579B2 ## CPC - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA] - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract In a first aspect, a communication control method is used in a cellular communication system. The communication control method includes performing, at a relay node, Listen Before Talk (LBT). The communication control method includes storing the number of successes and a failure rate in a downlink direction of the performed LBT in a memory as statistical information, and storing the number of successes and a failure rate in an uplink direction of the performed LBT in the memory as statistical information. The communication control method includes transmitting, at the relay node, the statistical information to an upper node of the relay node. ## Claims ### Claim 1 A communication control method used in a cellular communication system, the communication control method comprising: performing, by a user equipment, Listen Before Talk (LBT) on a shared spectrum; and transmitting to a base station, by the user equipment, a report including information indicating the number of LBT failures and information regarding to a radio state between the user equipment and the base station, wherein the LBT is performed by a lower entity in the user equipment, and the information indicating the number of LBT failures is based on the number of LBT failure indications received by an entity higher than the lower entity from the lower entity. ### Claim 2 (depends on 1) The communication control method according to claim 1, wherein the transmitting includes transmitting, by the user equipment, to the base station the report including information indicating consistent LBT failure as cause information. ### Claim 3 (depends on 1) The communication control method according to claim 1, wherein the transmitting includes transmitting, the user equipment, to the base station the report including the information in response to the occurrence of RLF (Radio Link Failure) or HOF (Handover Failure) due to the LBT failure and transmitting to the base station the report not including the information in response to the occurrence of RLF or HOF not due to the LBT failure. ### Claim 4 A cellular communication system comprising: a user equipment; and a base station, wherein the user equipment performs LBT (Listen Before Talk) on a shared spectrum, the use equipment transmits to a base station, a report including information indicating the number of LBT failures and information regarding to a radio state between the user equipment and the base station, wherein the LBT is performed by a lower entity in the user equipment, and the information indicating the number of LBT failures is based on the number of LBT failure indications received by an entity higher than the lower entity from the lower entity. ### Claim 5 (depends on 4) The cellular communication system according to claim 4, wherein the user equipment transmits to the base station the report including information indicating consistent LBT failure as cause information. ### Claim 6 (depends on 4) The cellular communication system according to claim 4, wherein the user equipment transmits to the base station the report including the information in response to the occurrence of RLF (Radio Link Failure) or HOF (Handover Failure) due to the LBT failure and transmits to the base station the report not including the information in response to the occurrence of RLF or HOF not due to the LBT failure. ### Claim 7 A user equipment comprising a transceiver circuitry and a processing circuitry operatively associated with the transceiver circuitry and configured to execute processes of: performing Listen Before Talk (LBT) on a shared spectrum; transmitting a report including information indicating the number of LBT failures and information regarding to a radio state between the user equipment and the base station, wherein the LBT is performed by a lower entity in the user equipment, and the information indicating the number of LBT failures is based on the number of LBT failure indications received by an entity higher than the lower entity from the lower entity. ### Claim 8 (depends on 7) The user equipment according to claim 7, wherein the transceiver circuitry is configured to execute process of transmitting to the base station the report including information indicating consistent LBT failure as cause information. ### Claim 9 (depends on 7) The user equipment according to claim 7, wherein the transceiver circuitry is configured to execute processes of transmitting to the base station the report including the information in response to the occurrence of RLF (Radio Link Failure) or HOF (Handover Failure) due to the LBT failure and transmitting to the base station the report not including the information in response to the occurrence of RLF or HOF not due to the LBT failure. ### Claim 10 A non-transitory computer-readable storage medium storing a program for causing a computer to execute processing comprising: performing Listen Before Talk (LBT) on a shared spectrum; transmitting to a base station, a report including information indicating the number of LBT failures and information regarding to a radio state between the user equipment and the base station, wherein the LBT is performed by a lower entity in the user equipment, and the information indicating the number of LBT failures is based on the number of LBT failure indications received by an entity higher than the lower entity from the lower entity. ### Claim 11 (depends on 10) The non-transitory computer-readable storage medium according to claim 10, wherein the transmitting include transmitting to the base station the report including information indicating consistent LBT failure as cause information. ### Claim 12 (depends on 10) The non-transitory computer-readable storage medium according to claim 10, wherein the transmitting includes transmitting to the base station the report including the information in response to the occurrence of RLF (Radio Link Failure) or HOF (Handover Failure) due to the LBT failure and transmitting to the base station the report not including the information in response to the occurrence of RLF or HOF not due to the LBT failure. ### Claim 13 A chipset for a user equipment in a cellular communication system, the chipset comprising: performing Listen Before Talk (LBT) on a shared spectrum; and transmitting to a base station, a report including information indicating the number of LBT failures and information regarding to a radio state between the user equipment and the base station, wherein the LBT is performed by a lower entity in the user equipment, and the information indicating the number of LBT failures is based on the number of LBT failure indications received by an entity higher than the lower entity from the lower entity. ### Claim 14 (depends on 13) The chipset according to claim 13, wherein the transmitting include transmitting to the base station the report including information indicating consistent LBT failure as cause information. ### Claim 15 (depends on 13) The chipset according to claim 13, wherein the transmitting includes transmitting to the base station the report including the information in response to the occurrence of RLF (Radio Link Failure) or HOF (Handover Failure) due to the LBT failure and transmitting to the base station the report not including the information in response to the occurrence of RLF or HOF not due to the LBT failure.