Patent ID: 11943800
Assignee: SONY GROUP CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. A radio communication device in a base station, the radio communication device comprising:
a radio transceiver configured to perform wireless communication in one or more serving cells; and
circuitry configured to control the radio transceiver to transmit downlink physical signals on a first cell among the one or more serving cells, wherein the downlink physical signals include Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS), and a downlink Demodulation Reference Signal (DMRS), wherein
the downlink physical signals are used by the user equipment to:
measure a radio link quality using the downlink physical signals,
evaluate the radio link quality against thresholds Qout and Qin,
on condition that the radio link quality is worse than the threshold Qout, indicate out-of-sync to higher layers from a physical layer,
on condition that the radio link quality is better than the threshold Qin, indicate in-sync to the higher layers than the physical layer,
start a first timer when the out-of-sync is consecutively indicated to the higher layers from the physical layer, and
determine that a radio link failure occurs in the first cell in a case where the first timer expires without consecutive in-sync indications, wherein

the first timer used to determine whether the radio link failure occurs in the first cell is different from a second timer used to determine whether a radio link failure occurs in a second cell served by another base station.