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 each of at least one cell to at least one TAG, the TAG including at least one cell corresponding to same uplink timing advance; identifying whether a cell to be configured is a part of a primary TAG (PTAG) including a primary cell (PCell); transmitting, to a terminal, control information including a TAG identifier of the cell, if the cell is not part of the PTAG; and transmitting, to the terminal, control information without a TAG identifier of the cell, if the cell is part of the PTAG, wherein a TAG of the cell is assigned to the terminal as the PTAG if the TAG identifier of the cell is not included in the control information, and wherein a TAG of the cell is assigned to the terminal as a secondary TAG (STAG) corresponding to the TAG identifier if the TAG identifier of the cell is included in the control information.