Communication method using a carrier aggregation and apparatus therefore

摘要

The present invention is directed to a wireless communication system. More specifically, the present invention is directed to a method and an apparatus of controlling uplink transmission at a user equipment in a wireless communication system, wherein the user equipment is connected to multiple component carriers, which includes receiving configuration information for transmitting an uplink signal from a base station; and identifying a time for transmitting the uplink signal to the base station on a corresponding uplink component carrier in use of the configuration information, wherein if the corresponding uplink component carrier is in a non-available state at the time for transmitting the uplink signal, the uplink signal is not transmitted.

主权项

1. A method of controlling uplink transmission at a user equipment in a wireless communications system, wherein the user equipment is configured with multiple uplink component carriers including a first uplink component carrier and a second uplink component carrier, the method comprising:
receiving, from a base station, Radio Resource Control (RRC) configuration information for a Sounding Reference Signal (SRS), the RRC configuration information including information for periodically transmitting the SRS to the base station; and performing a procedure for periodically transmitting the SRS to the base station on an uplink component carrier of the multiple uplink component carriers in use of the RRC configuration information, wherein an SRS transmission is performed on the uplink component carrier at a time for transmitting the SRS when the uplink component carrier is in an active state at the time for transmitting the SRS, and the uplink component carrier is configured to allow an uplink signal transmission in the active state, wherein the SRS transmission is skipped on the uplink component carrier at a time for transmitting the SRS when the uplink component carrier is in a non-active state at the time for transmitting the SRS, and the uplink component carrier is configured not to allow an uplink signal transmission in the non-active state, wherein a first downlink component carrier is paired with the first uplink component carrier, and the first downlink and uplink component carriers are always in the active state, and wherein the active/non-active states of the second uplink component carrier using Layer 2 (L2) control signaling, and the second uplink component carrier and a second downlink component carrier paired with the second uplink component carrier have a same state among the active/non-active states.