Method of transmitting pilot tones in a multi-sector cell, including null pilot tones, for generating channel quality indicators
US7218948B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 2003 |
| Grant date | May 15, 2007 |
| Priority date | — |
| Expiry date | Aug 12, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W52/325
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Pilot signal transmission sequences and methods for use in a multi-sector cell. Pilots in different sectors are transmitted at different known power levels. In adjacent sectors a pilot is transmitted while no pilot is transmitted in the adjoining sector. This represents transmission of a NULL pilot signal. A cell NULL is also supported in which NULL pilots are transmitted in each sector of a cell at the same time. Multiple pilot signal measurements are made. At least two channel quality indicator values are generated from measurements corresponding to at least two pilot signals of different power levels. The two values are transmitted back to the base station which uses both values to determine the transmit power required to achieve a desired SNR at the wireless terminal. The wireless terminal also reports information indicating its location to a sector boundary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.