Patent ID: 8516327
Filing Date: 2013-08-20
Classification: H04B,H04L

Abstract:
1. A method of performing hybrid automatic repeat request (HARQ) in a multiple-antenna system, the method comprising: receiving, by a base station, a plurality of codewords through a physical uplink shared channel (PUSCH); receiving, by the base station, a plurality of demodulation reference signals used to demodulate the plurality of codewords through a plurality of antenna ports, a cyclic shift of each demodulation reference signal being assigned based on an index of a corresponding antenna port; and transmitting, by the base station, a plurality of acknowledgment (ACK)/not-acknowledgment (NACK) signals for the plurality of codewords through a plurality of physical HARQ indicator channels (PHICHs), wherein a resource of a PHICH for a respective ACK/NACK signal is determined based on a lowest physical resource block index of a resource used in the PUSCH and a cyclic shift of a demodulation reference signal of a codeword corresponding to the respective ACK/NACK signal.