Patent ID: 9673950
Date: 2017-06-06
CPC Classifications: H04B,H04L,H04W

Claim:
1. A method for transmitting signals at a User Equipment (UE) in a multi-antenna wireless communication system, the method comprising: receiving acknowledgment (ACK)/negative ACK (HACK) information from a base station (BS); and retransmitting at least one transport block negatively acknowledged by the ACK/NACK information to the BS, wherein an uplink grant for retransmitting the at least one transport block is not detected, wherein if a number of the at least one transport block is not equal to a number of transport blocks indicated by a most recent uplink grant, cyclic shift values and orthogonal cover codes (OCCs) of a demodulation reference signal (DMRS) for the at least one transport block are determined based on a cyclic shift field included in the most recent uplink grant and a number of layers corresponding to the at least one transport block, and wherein if the number of the at least one transport block is equal to the number of transport blocks indicated by the most recent uplink grant, the cyclic shift values and the OCCs of the DMRS for the at least one transport block are same as those of the DMRS for the transport blocks indicated by the most recent uplink grant.