Patent ID: 9270434
Filing Date: 2016-02-23
CPC Classification: H04L,H04W

Claim Text:
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.