Transmitted signal power control in cellular communications systems
US6418137B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1998 |
| Grant date | Jul 9, 2002 |
| Priority date | — |
| Expiry date | Dec 14, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W52/24
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A base station produces a power control bit dependent on SNR (signal-to-noise ratio) determined for each time slot of a signal received from a remote station of a cellular communications system. If the SNR exceeds an upper threshold by an upper threshold margin, the power control bit is a binary 0 and the upper threshold margin is increased; if the SNR is below a lower threshold by a lower threshold margin, the power control bit is a binary 1 and the lower threshold margin is increased; and otherwise the power control bit alternates its binary value for successive time slots and setting the threshold margins are reset. In the remote station, the power control bits are accumulated by a bidirectional counter and the transmitted signal power is only changed up or down in response to the count exceeding a respective threshold. The process can also or instead be used for the opposite transmission direction, and provides fast power control using a single bit per time slot in a manner that is tolerant of errors in the transmitted power control bits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.