Method for transmitting uplink and wireless device using same

摘要

A method is described for uplink transmission in a wireless communication system. A user equipment determines whether to transmit or drop a sounding reference signal (SRS) on a last symbol in an ith subframe. The determination is performed if multiple timing advance groups (TAGs) are configured and if a portion of the last symbol of the ith subframe for the SRS transmission toward the a serving cell in a first TAG is overlapped with an (i+1)th subframe for transmitting an uplink channel toward a second serving cell in a second TAG.

主权项

1. A method for uplink transmission in a wireless communication system, the method comprising:
transmitting, by a user equipment, a random access preamble, after receiving a random access response including a timing advance command (TAC), adjusting, by the user equipment, an uplink transmission timing based on the TAC; determining, by the user equipment, a sounding reference signal (SRS) symbol in an ith subframe of an SRS transmission for a first serving cell in a first timing advance group (TAG); and dropping, by the user equipment, the SRS transmission on the SRS symbol in the ith subframe if:
multiple TAGs are configured,a portion of a last symbol of the ith subframe for the SRS transmission toward the first serving cell in the first TAG is overlapped with an (i+1)thsubframe for transmitting an uplink channel toward a second serving cell in a second TAG, anda total uplink transmission power exceeds a maximum value on the overlapped portion of the last symbol.