Method and apparatus for reporting downlink channel state
US9294172B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 2014 |
| Grant date | Mar 22, 2016 |
| Priority date | — |
| Expiry date | Jan 23, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/0619
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method of reporting a channel state to a base station supporting downlink multiple input multiple output (MIMO) in a wireless communication system includes measuring a downlink channel based on a downlink signal received from the base station, and reporting a codebook index for precoding of the downlink signal according to the measurement of the downlink channel. In the case in which the UE receives channel state information (CSI)-reference signal (RS) resources for N1 antenna ports, if a report for N2 (N1>N2) antenna ports is set, a codebook for the N2 antenna ports is configured as a subset of a codebook for the N1 antenna ports configured by the base station. Information about the N2 antenna ports is received from the base station.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.