Transmission power control method and a transmission power control apparatus
US5590409A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1995 |
| Grant date | Dec 31, 1996 |
| Priority date | — |
| Expiry date | May 11, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W52/10
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A transmission power control method of a mobile station in a CDMA (Code Division Multiple Access) system which primarily controls transmission power of the mobile station by using a closed loop control which enables high accuracy power control. When the received power at the base station of a signal from the mobile station suddenly increases owing to the state of buildings surrounding the mobile station, the transmission power of the mobile station must be quickly reduced to prevent the interference to other mobile stations. The mobile station measures an average value of the received power per transmission power control period of a desired signal from the base station, and detects the difference .DELTA.RSSI between the current average value and that of one of the previous transmission power control periods. If .DELTA.RSSI exceeds a reference power difference .DELTA.P.sub.th, transmission power P.sub.T corresponding to .DELTA.RSSI is set by using an open loop transmission power control to quickly reduce the transmission power of the mobile station. If .DELTA.RSSI is lower than .DELTA.P.sub.th, the transmission power P.sub.T is determined in accordance with the transmission power co…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.