Patent ID: 9450724
Filing Date: 2016-09-20
CPC Classification: H04L,H04W

Claim Text:
1. A method for transmitting a sounding reference signal (SRS) in a wireless communication system, performed by a user equipment that is configured with a plurality of serving cells including a time division duplex (TDD) cell and a frequency division duplex (FDD) cell, the method comprising: receiving downlink control information from a first serving cell of the plurality of serving cells, the downlink control information including a carrier indicator and a downlink assignment, the carrier indicator indicating a second serving cell of the plurality of serving cells, the downlink assignment indicating a downlink resource assignment at the second serving cell; and transmitting an SRS through the second serving cell if the downlink control information includes an aperiodic SRS request that indicates a triggering of an SRS transmission, wherein: if the first serving cell is the FDD cell and the second serving cell is the TDD cell, the downlink control information includes the aperiodic SRS request, and if the first serving cell is the TDD cell and the second serving cell is the FDD cell, the downlink control information does not include the aperiodic SRS request.