Apparatus for allocating subscriber identification numbers to plural service zones in a paging system

• US 5,111,197 A
• Filed: 02/21/1990
• Issued: 05/05/1992
• Est. Priority Date: 03/06/1987
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Ichikawa, Yoshio
• Primary Examiner(s): Yusko, Donald J.
• Assistant Examiner(s): Magistre, Dervis
• Application Number:
  US07/483,314
• Time in Patent Office: 804 Days
• Field of Search: 340/825.44, 340/311.1, 340/825.48, 455/31, 455/33, 379/56, 379/57, 379/59, 379/60, 370/94.1
• US Class Current: 340/7.27
• CPC Class Codes: H04M 11/022 Paging systems personal calling arrangements or devices G08B3/1008; selective calling networks H04W84/022
• CPC Class Codes: H04M 3/533 Voice mail systems
• CPC Class Codes: H04W 84/022 One-way selective calling networks, e.g. wide area paging

Abstract

A paging system comprises a predetermined number of radio paging terminals each producing a subscriber identification number, a service zone signal, and a frequency signal respectively corresponding to a subscriber number, a paging processor for allocating subscriber identification numbers received from the radio paging terminals respectively to a predetermined number of paging service zones and a predetermined number of time slots in accordance with the service zone signals and frequency signals, and a predetermined number of transmitter for radiating paging signals provided in each of the paging service zones so that at least two paging signals having different frequencies which are obtained by modulating at least two of the subscriber identification numbers are radiated in two adjacent paging service zones at one of the time slots.

Claims

1. An apparatus for allocating subscriber identification numbers to plural service zones in a paging system, comprising:

plural ratio paging terminals each including a first control unit and a subscriber file for storing subscriber numbers, and pager identification numbers, service zones and signal frequencies corresponding to said subscriber numbers, and receiving subscriber numbers from a public switching telephone network, said control unit reading said pager identification number, said service zone and said signal frequency corresponding to said subscriber number received from said public switching telephone network out of said subscriber file;

a paging processor including a second control unit, plural queing means equal in number to said signal frequencies in each service zone, and plural paging signal encoders, and receiving information of said pager identification numbers, said service zones and said signal frequencies read out of said subscriber file from said plural radio paging terminals, said second control unit controlling each of said plural queing means to carry out queing operation exclusively for each of said service zones in accordance with said information, whereby each of said pager identification numbers is allocated to at least one service zone to have at least one of said signal frequencies, said second control unit controlling said each of said plural queing means to carry out time slot allocating operation exclusively for said each of said service zones in accordance with a predetermined order of said signal frequencies, whereby paging signals, among which the frequency collision is avoided in two adjacent service zones of said service zones, are produced and said second control unit controlling said plural paging signal encoders to encode said paging signals;

plural expanders each belonging to a corresponding one of said service zones, and receiving said encoded paging signals from said paging processor to divide a corresponding one of said paging signals into a predetermined number of paging signals; and

plural transmitters provided in said each of said service zones, each of said plural transmitters receiving one of said divided paging signals and radiating said one of said divided paging signals.

2. A paging system according to claim 1

wherein each of said said expanders is provided with output line interfaces through which predetermined number of said pager identification numbers are passed, each of said output line interfaces delaying a corresponding one of said pager identification numbers by a predetermined time.

3. The apparatus as defined in claim 1, wherein said at least one service zone to which said each pager identification number is changed by changing service zones stored in said subscriber file, and said each pager identification number is allocated to plural surface zones by writing plural surface zones into said service zones.

4. A paging system according to claim 1, wherein each of said transmitters includes a number of modulators each modulating a corresponding one of said pager identification numbers with a frequency designated by said paging processor.

5. A paging system according to claim 4,

wherein said each of said transmitters includes a down signal supervisory circuit to activate a corresponding one of said modulators in accordance with the allocation of said pager identification numbers.