Efficient transmission of stand-alone aperiodic CSI reporting for LTE carrier aggregation
US9485774B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2014 |
| Grant date | Nov 1, 2016 |
| Priority date | — |
| Expiry date | Feb 22, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W72/21
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The transmission of stand-alone, aperiodic CSI reports from a UE in carrier aggregation in an LTE network is optimized. The coding rate is indirectly controlled by varying the number of RBs allocated for the CSI report transmission. Two sets of serving cells are established, and the payload of each set is approximated. For each allowable number of RBs and each payload size, a threshold SINR is determined and stored. An initial number of RBs is selected, based on the number of cells. The actual SINR is measured, and compared to the threshold SINR for the number of RBs and payload size. The number of RBs to be allocated is varied based on the comparison, by varying an index into an array of allowable numbers of RBs. Link adaptation is performed based on observed decoding errors, in an outer loop control algorithm that prevents wind up. An optimization for the particular case of one PCell and one SCell is also presented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.