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

Claim 0:
1. A terminal apparatus that communicates with a base station apparatus, the terminal apparatus comprising:
a receiver configured to receive, from the base station apparatus, a message related to Radio Resource Control (RRC) connection reconfiguration; and
a processor, wherein
the processor, based on a fact that a first configuration is included in the message related to the RRC connection reconfiguration,
generates a Medium Access Control (MAC) entity of a cell group including a target primary cell,
determines, based on the first configuration 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,
changes 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 from a source primary cell to the target primary cell, and
establishes, for the DRB to which the first configuration is to be applied, a second RLC entity and a second DTCH logical channel for the target primary cell, wherein
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.