Patent ID: 9178663
Filing Date: 2015-11-03
Classification: H04L

Abstract:
1. A method for transmitting, at a base station, a Physical Hybrid Automatic Repeat reQuest (HARQ) Indicator Channel (PHICH) in a wireless communication system, the method comprising: channel-coding HARQ indicators (HI0 and HI1) to provide HI codeword (b0, b1, b2) in accordance with table 1; spreading the HI codeword (b0, b1, b2) to provide spread sequences, each spread sequence corresponding to a respective bit of the HI codeword (b0, b1, b2); and transmitting each spread sequence through a respective Resource Element Group (REG) of the PHICH, each REG including 4 neighboring subcarriers in an Orthogonal Frequency Division Modulation (OFDM) symbol, wherein the first bit (b0) and the second bit (b1) of the HI codeword are generated by the HI0 and HI1, respectively; and the third bit (b2) of the HI codeword is a result of an exclusive OR (XOR) of the first bit (b0) of the HI codeword and the second bit (b1) of the HI codeword,