Method and base station for detecting a HARQ-ACK codeword
US8750214B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 2010 |
| Grant date | Jun 10, 2014 |
| Priority date | — |
| Expiry date | May 25, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2001/125
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method in a base station for detecting a HARQ-ACK codeword comprised in a signal received from a UE is provided. The base station knows HARQ-ACK codewords being possible to detect. The base station receives (401) a signal from the UE comprising a modulation symbol. The base station estimates (402) a SNR value for the received signal, and calculates (403) soft values for the modulation symbol. When the SNR value is lower than a predetermined threshold value and when the modulation symbol of the received signal comprises more than two bits per modulation symbol, the base station uses a first mode. The first mode comprises correlating (405) only the two first calculated soft values for the modulation symbol with the one or more known possible HARQ-ACK codewords. In other cases, i.e. when the first mode is not used, the base station uses a second mode. The second mode comprises correlating (408) all calculated soft values for the modulation symbol with the known possible HARQ-ACK codewords.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.