Patent ID: 11950312
Assignee: SHARP KABUSHIKI KAISHA
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. A method for a base station apparatus that communicates with a terminal apparatus, the method comprising:
including a first configuration in a message related to Radio Resource Control (RRC) connection reconfiguration; and
transmitting, to the terminal apparatus, the message related to the RRC connection reconfiguration, wherein
in a case that the first configuration is included in the message related to the RRC connection reconfiguration,
a Data Radio Bearer (DRB) to which the first configuration is to be applied and a DRB to which the first configuration is not to be applied are determined based on the first configuration,
a Medium Access Control (MAC) entity of a cell group including a target primary cell is generated,
a primary cell with which a first Radio Link Control (RLC) entity and a first Dedicated Traffic CHannel (DTCH) logical channel of the DRB to which the first configuration is not to be applied are associated is changed from a source primary cell to the target primary cell,
a second RLC entity and a second DTCH logical channel for the target primary cell for the DRB to which the first configuration is to be applied are established, and
the first configuration is a configuration for a handover in which transmission and/or reception of first user data is performed in a target cell in a state where transmission and/or reception of second user data is continued in a source cell.