Patent ID: 9444596
Filing Date: 2016-09-13
CPC Classification: H04L,H04W

Claim Text:
1. A method for a user equipment (UE) to transmit multiple data units to a base station via multiple transmission antennas, the method comprising: receiving, from the base station, downlink control information informing the UE of control information for transmitting uplink data to the base station, wherein the downlink control information comprises a demodulation reference signal (DMRS) cyclic shift index field having a predetermined length; transmitting the multiple data units with multiple DMRSs to the base station via the multiple transmission antennas, wherein each of the multiple DMRSs is cyclic shifted with different cyclic shift values, and wherein each value of the DMRS cyclic shift index field indicates a combination of different cyclic shift values for each of the multiple DMRSs; and receiving a Physical Hybrid automatic repeat request Indicator Channel (PHICH) carrying ACKnowledgement/Negative ACKnowledgement (ACK/NACK) with respect to each of the transmitted multiple data units from the base station.