METHOD AND APPARATUS OF CONFIGURING DOWNLINK TIMING AND TRANSMITTING RANDOM ACCESS RESPONSE IN MOBILE COMMUNICATION SYSTEM USING CARRIER AGGREGATION
First Claim
1. A method for uplink timing adjustment by a base station, the method comprising:
- transmitting, to a terminal, a radio resource control message to configure a secondary cell (SCell) for a carrier aggregation (CA);
generating a medium access control (MAC) protocol data unit (PDU) including a MAC control element (MAC CE), wherein the MAC CE includes an identity of a timing advance group (TAG) including the SCell and a timing advance command (TAC) for uplink timing adjustment of the TAG including the SCell; and
transmitting the MAC PDU to the terminal,wherein the TAG is a group of at least one cell having same uplink timing,wherein the identity of the TAG is set to 0 if the TAG including the SCell is a primary TAG (PTAG), andwherein the PTAG is a TAG that includes a primary cell (PCell).
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Accused Products
Abstract
A method of configuring downlink timings and transmitting a random access response message is provided for a random access procedure in a Long Term Evolution (LTE) system supporting carrier aggregation. The method for adjusting timing of a terminal in a wireless communication system supporting carrier aggregation of at least one carrier includes transmitting a Random Access Preamble to a base station, and receiving a Random Access Response with a Timing Advance Command (TAC) for commanding uplink timing adjustment from the base station, wherein the Random Access Response comprises information indicating a Timing Advance Group (TAG) to which the TAC is applied.
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Citations
1 Claim
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1. A method for uplink timing adjustment by a base station, the method comprising:
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transmitting, to a terminal, a radio resource control message to configure a secondary cell (SCell) for a carrier aggregation (CA); generating a medium access control (MAC) protocol data unit (PDU) including a MAC control element (MAC CE), wherein the MAC CE includes an identity of a timing advance group (TAG) including the SCell and a timing advance command (TAC) for uplink timing adjustment of the TAG including the SCell; and transmitting the MAC PDU to the terminal, wherein the TAG is a group of at least one cell having same uplink timing, wherein the identity of the TAG is set to 0 if the TAG including the SCell is a primary TAG (PTAG), and wherein the PTAG is a TAG that includes a primary cell (PCell).
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Specification