| 主权项 |
1. A method for performing a hybrid automatic repeat request (HARQ) process by a user equipment (UE) in a wireless communication system, the UE configured with a second cell having a second uplink-downlink (UL-DL) configuration and a first cell having a first UL-DL configuration different from second UL-DL configuration such that the first cell has a number of DL subframes greater than or equal to a number UL subframes and the second cell has a number of DL subframes less than a number of UL subframes, the method comprising:
receiving, by the UE, a UL grant through the first cell; transmitting data, by the UE in accordance with the UL grant, through a subframe of the second cell, wherein a physical HARQ indicator channel (PHICH) resource of the first cell for the data transmitted in the subframe of the second cell is determined by the UE based on the following equations:
nPHICHgroup=(IPRB—RA+nDMRS)mod NPHICHgroup+IPHICHNPHICHgroup nPHICHseq=(└IPRB—RA/NPHICHgroup┘+nDMRS)mod 2NSFPHICH, and wherein nPHICHgroup represents a PHICH group index, nPHICHseq represents an orthogonal sequence index, IPRB—RA denotes a value relates to an index of a resource block used to transmit the data, nDMRS is obtained from a value of a demodulation reference signal (DMRS)-related field in the UL grant, NPHICHgroup indicates the number of PHICH groups, NSFPHICH indicates an orthogonal sequence length, and IPHICH has a value of 0 or 1 for the subframe; and performing one of:
a PHICH-based retransmission procedure for the data transmitted in the subframe of the second cell when IPHICH=0, ora non-PHICH-based retransmission procedure for the data transmitted in the subframe of the second cell when IPHICH=1. |
