Random access in mobile radio telephone systems

Pulse or digital communications – Repeaters – Testing

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455 542, 455 70, H04J 1304, H04B 7216

Patent

active

054307600

ABSTRACT:
The present invention includes a system and method for minimizing interference between two radio stations, e.g., a mobile radio telephone and a fixed base station, at the initiation of a radio communication. A mobile station initiates a random access at the lowest power level and increases the transmission power level until the base station detects the access signal. Once detected, the power level of the message is maintained at the detected level so that the signal interference is avoided. The present invention also provides a mechanism for synchronizing random access communications between mobile stations and the base station despite variation in distances between the mobile and base stations.

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Thompson et al., "Automatic Power Control in the PTARMIGAN SCRA Sybsystem," IEE Conference Publication No. 139, 1976.

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