Method, apparatus and computer program to map a cyclic shift to a channel index
US8289935B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 2009 |
| Grant date | Oct 16, 2012 |
| Priority date | — |
| Expiry date | Jan 17, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W72/53
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
From the network perspective, an uplink resource allocation (PDCCH) is sent that grants an uplink resource to a plurality of user equipments UEs, and the allocation has an indication of a cyclic shift CS for each of the plurality of UEs. The granted uplink resource is mapped to a downlink resource (PHICH) in dependence on the indicated CS for each of the plurality of UEs. The mapping is such that for a predetermined number of UEs being allocated a same uplink resource in a single MU-MIMO uplink resource allocation grant, each pair of said predetermined number of UEs which map to an adjacent downlink resource exhibit an optimized CS relative to one another. The network sends to each of the respective plurality of UEs on the respective mapped downlink resource an indication (ACK/NACK) about data received (on a PUSCH).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.