发明名称 |
Paging method and apparatus |
摘要 |
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 (f1) carries a local clock; a second local frequency (f2) carries communications packets from the central control station to paging units; a third local frequency (f3) carries communication packets from the pager units to the central control station; and a fourth local frequency (f4) carries a status or request signal from the paging units (22) to the central control station (20). Transmissions on the fourth local frequency (f4) 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 (420x) 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 (f1-f4) [which may differ from cell to cell], and four of the utilized frequencies are lower power common frequencies or switching frequencies (C1-C4) which are used to switch or hand-off a pager unit (422) traveling from one cell to another. |
申请公布号 |
US5689807(A) |
申请公布日期 |
1997.11.18 |
申请号 |
US19960609976 |
申请日期 |
1996.02.29 |
申请人 |
DIGICOMM, LTD. |
发明人 |
WONG, GABRIEL K.;TSUI, PO S. |
分类号 |
H04J3/00;H04B7/00;H04L7/00;H04L12/56;H04W12/06;H04W28/26;H04W36/08;H04W48/08;H04W56/00;H04W68/00;H04W68/02;H04W72/04;H04W74/04;H04W74/06;H04W74/08;H04W76/02;H04W84/02;H04W88/18;(IPC1-7):H04B7/208 |
主分类号 |
H04J3/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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