Selective call system

Details Selective call system Selective call system

1995-11-02

1999-02-16

Horabik, Michael

Communications: electrical

Continuously variable indicating

With meter reading

34082508, 34082554, 370346, 370350, 370449, 375200, 375202, 375317, H04Q 700

Patent

active

058725229

ABSTRACT:
A selective call system including a system controller, a base station transceiver and a plurality of secondary stations with receivers and low powered transmitters capable of sending spread spectrum signals. Invitations are issued to the secondary stations by the system controller at varying power levels. Only those secondary stations receiving the invitation signal are able to respond. Those secondary stations too far away cannot respond to a low power invitation, and since each secondary station can only respond once, upon a received invitation of increased power, such outer lying secondary stations can respond without interference from closer lying secondary stations.

REFERENCES:
patent: 4833702 (1989-05-01), Shitara et al.
patent: 4882579 (1989-11-01), Siwiak
patent: 4964121 (1990-10-01), Moore
patent: 4968966 (1990-11-01), Jasinski et al.
patent: 5265119 (1993-11-01), Gilhousen et al.

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