Patent ID: 9215677
Filing Date: 2015-12-15
Classification: H04L,H04W

Abstract:
1. A terminal apparatus that communicates with a base station apparatus by aggregating a plurality of cells, comprising: a control unit configured to: configure an uplink transmission timing group to which the cells belong, on the basis of a configuration of a transmission timing group which includes a group identifier that identifies the uplink transmission timing group to which the cells belong and a transmission timing timer which indicates available time of an uplink transmission timing of the cells in the group, and release the configuration of the transmission timing group corresponding to the group, in a case where a timing reference cell used as a reference of the uplink transmission timing does not exist in the group due to a modification of a cell configuration on the basis of a modification instruction message, wherein the modification instruction message is transmitted from the base station apparatus and indicates an instruction of modification of the cells in the group.