Patent ID: 9049704
Filing Date: 2015-06-02
Classification: H04L,H04W

Abstract:
1. A method for performing a hybrid automatic repeat request (HARQ) procedure by a user equipment (UE) in a carrier aggregation (CA)-based wireless communication system, the method comprising: configuring a first cell and a second cell having different subframe configurations, the second cell having time division duplex uplink-downlink (TDD UL-DL) configuration #0; receiving a UL grant through the first cell; and transmitting data corresponding to the UL grant through the second cell, wherein a physical hybrid ARQ indicator channel (PHICH) resource for the data is determined by the following equations in the first cell, wherein n PHICH group represents a PHICH group index, n PHICH seq represents an orthogonal sequence index, I PRB RA denotes a value relates to the index of a resource block used to transmit the data, n DMRS is obtained from a value of a demodulation reference signal (DMRS)-related field in scheduling information, N PHICH group indicates the number of PHICH groups, N SF PHICH indicates an orthogonal sequence length, and I PHICH is 0 or 1, wherein retransmission for the data is performed on the basis of at least one of the PHICH and the UL grant when PHICH resource of I wherein retransmission for the data is performed on the basis of only the UL grant when PHICH resource of I