Title:
ページング方法および装置
Document Type and Number:
Japanese Patent JP4567796
Kind Code:
B2
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 (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) Äwhich may differ from cell to cellÜ, 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.
Inventors:
Gabriel Kay Wy Won
Poes. Tsui
Poes. Tsui
Application Number:
JP2009033299A
Publication Date:
October 20, 2010
Filing Date:
February 16, 2009
Export Citation:
Assignee:
NP Corporation
International Classes:
H04J3/00; H04W84/02; H04B7/00; H04L7/00; H04L12/56; H04L29/08; H04W72/04; H04W74/02; H04W74/06; H04W74/08; H04W88/18; H04W12/06; H04W28/26; H04W36/08; H04W48/08; H04W56/00; H04W68/00; H04W68/02; H04W74/04; H04W76/02
Domestic Patent References:
| JP5327580A | ||||
| JP4252526A | ||||
| JP4114521A | ||||
| JP3104429A |
Attorney, Agent or Firm:
Hidesaku Yamamoto
Takaaki Yasumura
Natsuki Morishita
Takaaki Yasumura
Natsuki Morishita