Patent ID: 9344242
Filing Date: 2016-05-17
CPC Classification: H04B,H04L,H04W

Claim Text:
1. A method for uplink transmission in a wireless communication system, the method performed by a user equipment (UE) and comprising: performing, by the UE, a first time alignment (TA) to a first cell belonging to a first timing advance group (TAG); performing, by the UE, a second TA to a second cell belonging to a second TAG; wherein when a plurality of TAGs including the first and second TAGs are configured and when a subframe is reserved for transmitting a sounding reference signal (SRS), a last orthogonal frequency division multiplexing (OFDM) symbol in the subframe is excluded from performing a coding with respect to a data for a physical uplink shared channel (PUSCH), irrespective of whether or not the SRS is dropped or transmitted in the subframe; determining, by the UE, whether to transmit or drop the SRS on the subframe even when the last OFDM symbol is excluded from performing the coding and then not used to transmit the PUSCH; transmitting the SRS on the subframe when the UE determines to transmit the SRS; and dropping the SRS on the subframe when the UE determines satisfaction of all of at least three conditions including: a first condition specifying that the plurality of TAGs including the first and second TAGs are configured, a second condition specifying that at least one symbol of a first subframe which is used to transmit the SRS toward the second cell of the second TAG is overlapped with a second subframe on which the PUSCH is transmitted toward the first cell of the first TAG, and a third condition specifying that a total uplink transmission power exceeds a maximum value.