Title:
ADAPTIVE POWER CONTROL IN A RADIO COMMUNICATIONS SYSTEM
Document Type and Number:
WIPO Patent Application WO2000055976
Kind Code:
A3
Abstract:
Delays on a common radio communications channel employed by plural mobile stations to communicate with a base station located in a corresponding geographical cell area are minimized by adapting transmission power based on traffic conditions. For lower traffic loads, a higher transmission power is permitted. For higher traffic loads, a lower power level is set. A transmit power level is determined using a desired signal ratio, such as a target CIR, a transmission path loss over the radio communications channel, and an interference value. One or more adaptive power parameters are also employed in that determination to adapt the open loop power control based on one or more current communications conditions and/or characteristics of the mobile station. For example, an adaptive power parameter may be a function of a current interference in a base station cell either alone or in combination with a current interference in one or more neighboring cells. The adaptive power parameter may also account for a type of data packet connection to be employed between a mobile station and the base station after random access, a mobile station's subscription, a current temperature of the mobile station, a current base station used by the mobile station, a current estimated path loss between the mobile station and base station, and/or other factors.
Inventors:
BARK GUNNAR
MUELLER WALTER GERHARD ALOIS
RIMHAGEN THOMAS
MUELLER WALTER GERHARD ALOIS
RIMHAGEN THOMAS
Application Number:
PCT/SE2000/000448
Publication Date:
April 12, 2001
Filing Date:
March 07, 2000
Export Citation:
Assignee:
ERICSSON TELEFON AB L M (SE)
International Classes:
H04B1/04; H04B7/005; H04B7/26; (IPC1-7): H04B7/005
Foreign References:
| US5859838A | 1999-01-12 | |||
| US5574982A | 1996-11-12 |
Other References:
See also references of EP 1161802A2
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