US 11,057,159 B2
Method and an apparatus for improving a determination of HARQ-ACK messages in a wireless communications system
Nan Li, Fanling (HK); Xiangyu Liu, Shatin (HK); Yuxian Zhang, Fanling (HK); Man Wai Kwan, Shatin (HK); Ho Yin Chan, Kowloon (HK); and Kong Chau Tsang, Kowloon (HK)
Assigned to Hong Kong Applied Science and Technology Research Institute Co. Ltd., Shatin (HK)
Filed by Hong Kong Applied Science And Technology Research Institute Co., Ltd., Shatin (HK)
Filed on Jan. 23, 2019, as Appl. No. 16/254,964.
Prior Publication US 2020/0235864 A1, Jul. 23, 2020
Int. Cl. H04L 1/18 (2006.01); H04W 72/08 (2009.01); H03M 13/45 (2006.01); H04W 76/28 (2018.01); H04L 1/16 (2006.01); H04L 5/00 (2006.01)
CPC H04L 1/1812 (2013.01) [H03M 13/45 (2013.01); H04L 1/1607 (2013.01); H04L 5/0055 (2013.01); H04W 72/085 (2013.01); H04W 76/28 (2018.02)] 19 Claims
OG exemplary drawing
 
1. A method for determining a Hybrid Automatic Repeat Request (HARQ) transmission signal; the method comprising the steps of:
receiving soft bits from a wireless communication physical channel uplink signal, said received soft bits comprising or being deemed to comprise HARQ Log-Likelihood Ratios (LLRs);
soft decoding said HARQ LLRs to output a hard Acknowledgement/Negative-Acknowledgement (ACK/NACK) decision;
flipping said HARQ LLRs by flipping signs of the soft bits of said HARQ LLRs using an expected bit pattern for said hard ACK/NACK decision such that the flipped HARQ LLRs map to a same constellation point or points if the physical channel uplink signal contains an ACK or NACK transmission signal; and
using said flipped HARQ LLRs to determine if the physical channel uplink signal contains an ACK or NACK transmission signal or to determine if the physical channel uplink signal comprises discontinuous transmission (DTX).