METHOD AND APPARATUS FOR MANAGING MULTIPLE TIMING ADVANCE GROUPS IN MOBILE COMMUNICATION SYSTEM SUPPORTING CARRIER AGGREGATION

摘要

A method and apparatus for managing multiple Timing Advance Groups (TAGs) operating with different timings are provided for use in a Long Term Evolution (LTE) system. The method for managing multiple TAGs at a base station of a wireless communication system supporting carrier aggregation according to an exemplary embodiment of the present invention includes categorizing a plurality of carriers into at least one TAG according to a predetermined rule, assigning a TAG index to each TAG, transmitting the TAG index to a terminal, generating a Timing Advance Command (TAC) for synchronization, and transmitting the TAC to the terminal in a random access process. The method and apparatus for managing TAGs according to exemplary embodiments of the present invention is capable of informing of the timing advance group to which each carrier belongs and managing multiple timing advance groups efficiently without signaling overhead.

主权项

1. A method for managing at least one timing advance group (TAG) by a base station in a wireless communication system supporting carrier aggregation, the method comprising:
mapping respective secondary cells to at least one TAG, the TAG including at least one cell to which the same uplink timing advance applies, identifying whether a first secondary cell to be configured is part of a primary TAG including a primary cell, transmitting, to a terminal, configuration information including an identifier of a TAG for the first secondary cell, if the first secondary cell is not part of the primary TAG, transmitting, to the terminal, configuration information without the identifier of the TAG for the first secondary cell, if the first secondary cell is the part of the primary TAG, and transmitting, to the terminal, a MAC control element (MAC CE) including the identifier of TAG for the first secondary cell and a timing advance command (TAC).