Telecommunications – Transmitter and receiver at separate stations
Patent
1996-02-29
1998-03-17
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
455 381, 370314, H04B 712
Patent
active
057298270
ABSTRACT:
A two-way paging system utilizes four local frequencies for transmissions between pager units (22) and a central control station (20). A first local frequency (f.sub.1) carries a local clock; a second local frequency (f.sub.2) carries communications packets from the central control station to paging units; a third local frequency (f.sub.3) carries communication packets from the pager units to the central control station; and a fourth local frequency (f.sub.4) carries a status or request signal from the paging units (22) to the central control station (20). Transmissions on the fourth local frequency (f.sub.4) are in accordance with a time divided slot allocation among pager units accessing the central control station (20). For a two-way paging system having a plurality of central control stations (420.sub.x) servicing a corresponding plurality of cells, a total of eight frequencies are utilized within any one cell. Four of the may differ from cell to cell!, and four of the utilized frequencies are lower power common frequencies or switching frequencies (C.sub.1 -C.sub.4) which are used to switch or hand-off a pager unit (422) traveling from one cell to another.
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Tsui Po S.
Wong Gabriel K. Y.
Digicomm Ltd.
Eisenzopf Reinhard J.
Lee Thanh
LandOfFree
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