UPLINK SOUNDING REFERENCE SIGNALS CONFIGURATION AND TRANSMISSION

摘要

PROBLEM TO BE SOLVED: To provide methods and apparatus for an uplink sounding reference signal (SRS) configuration and transmission.SOLUTION: The methods include receiving a configuration of wireless transmit/receive unit (WTRU)-specific SRS subframes for transmitting SRSs and, upon receipt of a trigger, transmitting the SRSs for a number of antennas. The SRS transmissions may occur in each of the duration of WTRU-specific SRS subframes that start a number of WTRU-specific SRS subframes after a triggering subframe. For multiple SRS transmissions from multiple antennas, cyclic shift multiplexing and different transmission combs are used. The cyclic shift for an antenna is determined from a cyclic shift reference value. The cyclic shift provides a maximum distance between cyclic shifts for the antennas transmitting SRSs in the same WTRU-specific subframe. SRS transmissions from multiple antennas in the WTRU-specific subframe are done in parallel.