Zoned data communications system for communicating message signa

Details Zoned data communications system for communicating message signa Zoned data communications system for communicating message signa

1984-08-13

1985-06-25

Ng, Jin F.

Telecommunications

Transmitter and receiver at separate stations

455 52, 455 56, 455137, H04B 100, H04B 700

Patent

active

045258619

ABSTRACT:
A data communications system is described that covers a geographic area divided into a plurality of non-overlapping zones and includes a general communications controller (GCC), a plurality of channel communications modules (CCM) and associated transmitters and receivers, and a plurality of portable radios. Message signals carrying alphanumeric information are communicated between the GCC and the portable radios by way of a radio channel. Each CCM takes a signal strength measurement every time it receives a message signal from a portable radio. The GCC gathers the signal strength measurements from the CCM receivers receiving the same message signal and computes an adjusted signal strength for each zone. The GCC then selects the zone having the largest adjusted signal strength for determining the location of the portable radio that transmitted the message signal. Whenever the GCC transmits a message signal to a portable radio, the CCM transmitter is used that covers the zone having the largest adjusted signal strength for the last transmission from that portable radio. Since the GCC can be simultaneously transmitting message signals to portable radios in other zones using non-interfering CCM transmitters, information throughput is greatly enhanced.

REFERENCES:
patent: 3310741 (1967-03-01), Uitermark et al.
patent: 4028500 (1977-06-01), McClure et al.
patent: 4144412 (1979-03-01), Ito et al.
patent: 4144496 (1979-03-01), Cunningham et al.
patent: 4369520 (1983-01-01), Cerny, Jr. et al.
patent: 4434461 (1984-02-01), Puhl

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