Telecommunications – Transmitter and receiver at separate stations
Patent
1997-12-09
2000-08-22
Le, Thanh Cong
Telecommunications
Transmitter and receiver at separate stations
H04B 7208
Patent
active
061085200
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 utilized frequencies are the local frequencies (f.sub.1 -f.sub.4) [which 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.
REFERENCES:
patent: 5542115 (1996-07-01), Wong et al.
Tsui Po S.
Wong Gabriel K. Y.
Cong Le Thanh
Digicomm Ltd.
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