Protection switching system for cellular control signals

Details Protection switching system for cellular control signals Protection switching system for cellular control signals

1996-08-28

1999-09-28

Olms, Douglas W.

Multiplex communications

Fault recovery

Bypass an inoperative channel

370248, 370336, 370362, 370375, 370378, 370509, 370522, 455511, H04L 1250, H04Q 1100

Patent

active

059599715

ABSTRACT:
In a base station controller of a cellular communication system, a center-to-base time-division multiplexed (TDM) signal from a mobile switching center is demultiplexed into multiple downlink TDM signals and forwarded via transmission lines to a cell-site base station and multiple uplink TDM signals from the base station are multiplexed into a base-to-center TDM signal and transmitted to the mobile switching center. One of the downlink TDM signals contains downlink cellular control data and one of the uplink TDM signals contains uplink cellular control data. In the base station, the downlink TDM signals are multiplexed into a base-to-mobile TDM signal for transmission to mobile stations and a mobile-to-base TDM signal is demultiplexed into multiple uplink TDM signals and transmitted to the base station controller. The base station controller and the cell-site base station monitor the transmission lines to detect a failure and, upon detection of the failure, provides protection switching of the downlink cellular control data to a vacant time slot of another downlink TDM signal and protection switching of the uplink cellular control data to a vacant time slot of another uplink TDM signal.

REFERENCES:
patent: 4545049 (1985-10-01), Krammerer et al.
patent: 4884263 (1989-11-01), Suzuki
patent: 5398236 (1995-03-01), Hemmady et al.
patent: 5648962 (1997-07-01), Pirinen

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