Telecommunications – Transmitter and receiver at separate stations – With control signal
Patent
1995-05-11
1996-12-31
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
With control signal
455 541, 455 561, 455 671, 455 88, 370342, 375200, H04B 100
Patent
active
055904092
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 control bit sent from the base station.
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Adachi Fumiyuki
Sawahashi Mamoru
Eisenzopf Reinhard J.
Nguyen Lee
NTT Mobile Communications Network Inc.
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