METHOD FOR TRANSMITTING AN UPLINK SIGNAL, METHOD FOR RECEIVING AN UPLINK SIGNAL, USER EQUIPMENT, AND BASE STATION
First Claim
1. A method for transmitting, by a use equipment configured with a plurality of cells, an uplink signal to a base station, the method comprising:
- receiving information indicating a special secondary cell (SCell) for a random access procedure, among one or more SCells within an SCell group comprised of the one or more SCells of the plurality of cells, from the base station;
performing the random access procedure on the special SCell; and
transmitting an uplink signal for the one or more SCells within the SCell group to the base station on the special SCell through a PUCCH,wherein the SCell group is different from a PCell group which includes at least a primary cell (PCell) of the plurality of cells.
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Abstract
The invention relates to a method comprising classifying user equipment (UE) cells, to which carrier aggregation is applied, into a plurality of time advance groups. Uplink-time synchronization is managed using the time synchronization of a primary cell (Pcell) in the time synchronization group to which the primary cell belongs. For other time synchronization groups, the uplink time synchronization is managed using the time synchronization of a secondary cell (SCell) that is particularly set in the relevant time synchronization group. Thus, the plurality of time synchronizations can be effectively managed for the UE and a base station (BS).
264 Citations
13 Claims
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1. A method for transmitting, by a use equipment configured with a plurality of cells, an uplink signal to a base station, the method comprising:
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receiving information indicating a special secondary cell (SCell) for a random access procedure, among one or more SCells within an SCell group comprised of the one or more SCells of the plurality of cells, from the base station; performing the random access procedure on the special SCell; and transmitting an uplink signal for the one or more SCells within the SCell group to the base station on the special SCell through a PUCCH, wherein the SCell group is different from a PCell group which includes at least a primary cell (PCell) of the plurality of cells. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for receiving, by a base station, an uplink signal from a user equipment configured with a plurality of cells, the method comprising:
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transmitting information indicating a special secondary cell (SCell) for a random access procedure, among one or more SCells within an SCell group comprised of the one or more SCells of the plurality of cells, to the user equipment; performing the random access procedure with the user equipment on the special SCell; and receiving an uplink signal for the one or more SCells within the SCell group from the user equipment on the special SCell through a PUCCH, wherein the SCell group is different from a PCell group which includes at least a primary cell (PCell) of the plurality of cells. - View Dependent Claims (8, 9, 10, 11)
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12. A user equipment, which is configured with a plurality of cells, for transmitting an uplink signal to a base station, the user equipment comprising:
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a radio frequency (RF) unit configured to transmit or receive a radio signal; and a processor configured to control the RF unit, wherein the processor controls the RF unit to receive information indicating a special secondary cell (SCell) for a random access procedure, among one or more SCells within an SCell group comprised of the one or more SCells of the plurality of cells, from the base station, controls the RF unit to perform the random access procedure on the special SCell, and controls the RF unit to transmit an uplink signal for the one or more SCells within the SCell group to the base station on the special SCell through a PUCCH, wherein the SCell group is different from a PCell group which includes at least a primary cell (PCell) of the plurality of cells.
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13. A base station for receiving an uplink signal from a user equipment, which is configured with a plurality of cells, the base station comprising:
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a radio frequency (RF) unit configured to transmit or receive a radio signal; and a processor configured to control the RF unit, wherein the processor controls the RF unit to transmit information indicating a special secondary cell (SCell) for a random access procedure, among one or more SCells within an SCell group comprised of the one or more SCells, to the user equipment, and controls the RF unit to perform the random access procedure with the user equipment on the special SCell, and controls the RF unit to receive an uplink signal for the one or more SCells within the SCell group from the user equipment on the special SCell through a PUCCH, wherein the SCell group is different from a PCell group which includes at least a primary cell (PCell) of the plurality of cells.
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Specification