Method and apparatus for managing multiple timing advance groups in mobile communication system supporting carrier aggregation
First Claim
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, andwherein 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.
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Accused Products
Abstract
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.
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Citations
20 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. A method for managing at least one timing advance group (TAG) by a terminal in a wireless communication system supporting carrier aggregation, the method comprising:
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receiving first control information on configuring a first cell; receiving second control information on configuring a second cell, the second control information including a TAG identifier if the second cell is not part of a TAG of the first cell, the second control information not including a TAG identifier if the second cell is part of the TAG of the first cell; receiving MAC control element (MAC CE) including a TAG identifier and timing advance command (TAC) associated with at least one of the first cell and the second cell for time alignment of a TAG associated with the TAG identifier; and applying the TAC for the TAG associated with the TAG identifier, wherein the TAG of the first cell is a primary TAG (PTAG) including a primary cell (PCell), 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. - View Dependent Claims (7, 8, 9, 10)
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11. A base station for managing at least one timing advance group (TAG) in a wireless communication system supporting carrier aggregation, the base station comprising:
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a transmitter configured to transmit data; and a controller configured to; map each of at least one cell to at least one TAG, the TAG including at least one cell corresponding to same uplink timing advance; identify whether a cell to be configured is part of a primary TAG (PTAG) including a primary cell (PCell); transmit, to a terminal, control information including a TAG identifier of the cell, if the cell is not part of the PTAG; and transmit, 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. - View Dependent Claims (12, 13, 14, 15)
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16. A terminal for managing at least one timing advance group (TAG) in a wireless communication system supporting carrier aggregation, the terminal comprising:
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a receiver configured to receive data; and a controller configured to; receive first control information on configuring a first cell; receive second control information on configuring a second cell, the second control information including a TAG identifier if the second cell is not part of a TAG of the first cell, the second information not including a TAG identifier if the second cell is part of the TAG of the first cell; receive MAC control element (MAC CE) including a TAG identifier and timing advance command (TAC) associated with at least one of the first cell and the second cell for time alignment of a TAG associated with the TAG identifier; and apply the TAC for the TAG associated with the TAG identifier, wherein the TAG of the first cell is a primary TAG (PTAG) including a primary cell (PCell), 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. - View Dependent Claims (17, 18, 19, 20)
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Specification