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

Claim 0:
1. A user equipment comprising:
a radio transceiver configured to perform wireless communication in a first cell served by a first base station and a second cell served by a second base station; and
circuitry configured to:
perform Radio Link Monitoring (RLM) using downlink physical signals transmitted on the first cell served by the first base station, wherein the downlink physical signals include Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS), and a downlink Demodulation Reference Signal (DMRS),

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