Patent ID: 11937320
Assignee: KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. An operation method of a base station operating a first cell and a second cell, the first cell being a primary cell (PCell), and the operation method comprising:
transmitting, to a terminal, a connection reconfiguration message for configuring a carrier aggregation function including configuration information on the second cell operating as a secondary cell (SCell);
in response to detecting a beam failure for the second cell at the terminal, performing a procedure of receiving a report of a beam failure recovery from the terminal via the first cell or the second cell, the beam failure recovery being performed by the terminal for the second cell; and
in response to detecting a radio link failure (RLF) for the first cell at the terminal, performing a procedure of receiving a report of the RLF from the terminal via a third cell,
wherein the procedure of receiving the report of the RLF includes receiving a RLF message from the terminal via the third cell, the RLF message including an identifier of the first cell where the RLF occurred, location information of the terminal at a time of transmitting the RLF message, and information on a time elapsed after the occurrence of the RLF,
wherein the RLF message further includes information on whether a condition for performing a random access procedure for beam recovery is satisfied.