Patent ID: 9264262
Filing Date: 2016-02-16
CPC Classification: H04L,H04W

Claim Text:
1. A method for transmitting, by a user equipment (UE), an aperiodic sounding reference signal (SRS) in a wireless communication system, the method comprising: receiving, by the UE, an indication of a transmission mode of a physical uplink shared channel (PUSCH) from a base station through higher layer signaling; receiving, by the UE, an SRS parameter indicating a number of antenna ports for transmitting the aperiodic SRS from the base station through a physical downlink control channel (PDCCH); transmitting, by the UE, the aperiodic SRS to the base station through at least one antenna port corresponding to the number of the antenna ports for transmitting the aperiodic SRS, wherein the number of antenna ports for transmitting the aperiodic SRS is determined according to the transmission mode of the PUSCH, wherein the transmission mode of the PUSCH is either a single antenna port mode indicating that the PUSCH is transmitted via a single antenna port, or a multi antenna ports mode indicating that the PUSCH is transmitted via multi antenna ports, wherein the number of antenna ports for transmitting the aperiodic SRS is configured as one of 2 or 4 when the transmission mode of the PUSCH is the single antenna port mode, and wherein the SRS parameter is received by being included in a downlink control information (DCI) format 4; and receiving, by the UE, a parameter indicating an interval of cyclic shifts of each antenna port for transmitting the aperiodic SRS from the base station through the PDCCH, wherein the interval is one of 2 or 4.