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 terminal, the method comprising:
- receiving, from a base station, a respective identifier of at least one timing advance group (TAG) and information on a time alignment timer associated with each TAG;
receiving, from the base station, an identifier of TAG for a secondary cell to be configured;
receiving, from the base station, a MAC control element including the identity of the TAG for the secondary cell and a timing advance command (TAC);
applying the timing advance command for the TAG of the secondary cell based on the received MAC control element; and
starting a time alignment timer for the TAG of the secondary cell based on the received information on a time alignment timer associated with the TAG of the secondary cell if the MAC control element is received,wherein the TAG is a group of at least one secondary cell having same uplink timing.
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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
20 Claims
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1. A method for uplink timing adjustment by a terminal, the method comprising:
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receiving, from a base station, a respective identifier of at least one timing advance group (TAG) and information on a time alignment timer associated with each TAG; receiving, from the base station, an identifier of TAG for a secondary cell to be configured; receiving, from the base station, a MAC control element including the identity of the TAG for the secondary cell and a timing advance command (TAC); applying the timing advance command for the TAG of the secondary cell based on the received MAC control element; and starting a time alignment timer for the TAG of the secondary cell based on the received information on a time alignment timer associated with the TAG of the secondary cell if the MAC control element is received, wherein the TAG is a group of at least one secondary cell having same uplink timing. - View Dependent Claims (2, 3, 4, 5)
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6. A terminal for uplink timing adjustment, the terminal comprising:
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a transceiver configured to transmit and receive a signal; and at least one processor configured to; receive, from a base station, a respective identifier of at least one timing advance group (TAG) and information on a time alignment timer associated with each TAG, receive, from the base station, an identifier of TAG for a secondary cell to be configured, receive, from the base station, a MAC control element including the identity of the TAG for the secondary cell and a timing advance command (TAC), apply the timing advance command for the TAG of the secondary cell based on the received MAC control element, and start a time alignment timer for the TAG of the secondary cell based on the received information on a time alignment timer associated with the TAG of the secondary cell if the MAC control element is received, wherein the TAG is a group of at least one secondary cell having same uplink timing. - View Dependent Claims (7, 8, 9, 10)
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11. A base station for uplink timing adjustment, the base station comprising:
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a transceiver configured to transmit and receive a signal; and at least one processor configured to; transmit, to a terminal, a respective identifier of at least one timing advance group (TAG) and information on a time alignment timer associated with each TAG, transmit, to the terminal, an identifier of TAG for a secondary cell to be configured, and transmit, to the terminal, a MAC control element including the identity of the TAG for the secondary cell and a timing advance command (TAC), wherein the timing advance command for the TAG of the secondary cell is applied based on the received MAC control element by the terminal, wherein a time alignment timer for the TAG of the secondary cell is started based on the information on a time alignment timer associated with the TAG of the secondary cell if the MAC control element is received by the terminal, and wherein the TAG is a group of at least one secondary cell having same uplink timing. - View Dependent Claims (12, 13, 14, 15)
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16. A method by a base station, the method comprising:
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transmitting, to a terminal, a respective identifier of at least one timing advance group (TAG) and information on a time alignment timer associated with each TAG, transmitting, to the terminal, an identifier of TAG for a secondary cell to be configured, and transmitting, to the terminal, a MAC control element including the identity of the TAG for the secondary cell and a timing advance command (TAC), wherein the timing advance command for the TAG of the secondary cell is applied based on the received MAC control element by the terminal, wherein a time alignment timer for the TAG of the secondary cell is started based on the information on a time alignment timer associated with the TAG of the secondary cell if the MAC control element is received by the terminal, and wherein the TAG is a group of at least one secondary cell having same uplink timing. - View Dependent Claims (17, 18, 19, 20)
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Specification