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RF PROGRAMMED FREQUENCY AND/OR ADDRESS MODIFICATIONS FOR A SYNTHESIZED PAGER

IP.com Disclosure Number: IPCOM000005779D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2001-Nov-06
Document File: 3 page(s) / 116K

Publishing Venue

Motorola

Related People

Chung Tong: AUTHOR [+2]

Abstract

To design a nationwide synthesizer paging system that includes less expensive transmitters, pagers (or receivers), and simple operation. Each city will have transmitters with one frequency, and each subscriber will carry a synthesizer pager that could be switched to any frequency in the nation; hence, subscribers can travel to different cities and still get pages just like local pages. The subscribers would be provided a list of frequen- cies for every city in the network (could be coded list).

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MOlVROLA Technical Developments Volume 9 August 1989

RF PROGRAMMED FREQUENCY AND/OR ADDRESS MODIFICATIONS FOR A SYNTHESIZED PAGER

by Chung Tong and Jim Black

PURPOSE:

   To design a nationwide synthesizer paging system that includes less expensive transmitters, pagers (or receivers), and simple operation. Each city will have transmitters with one frequency, and each subscriber will carry a synthesizer pager that could be switched to any frequency in the nation; hence, subscribers can travel to different cities and still get pages just like local pages. The subscribers would be provided a list of frequen- cies for every city in the network (could be coded list).

OPERATION:

- Only 1 frequency assigned to one city - Each synthesizer pager is set at any frequency in the network through phones, no scanning required.

I

PAGER N1

Fig. 1. The Block Diagram of a Network

Fig. 1 shows n cities, each city has only one frequency, and m pagers are used within the city. For example:

Pager 11: is pager #l used in city 1 Pager lm: is pager #m used in city 1

Pager nl: is pager #l used in city n. Pager nm: is pager #m used in city n.

All subscribers in network will carry a synthesizer pager which could be controlled to switch to any fre- quency in any city if the subscriber desires to travel.

0 Motorola, Inc. 1989 30

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0 M

MOlWROLA Technical Developments Volume 9 August 1989

Prssmbls~Sync Pager Address Homs 'It' Frequsncy 'r1",4qy

Identification Reque.t.l

Hone city Frsquancy

iPrcamble,Sunc Pwr,Addr*sa ~~~~~~~~~~~~~~ R~~~~,+.B Data

Fig. 2. The Bit Pattern

   Fig. 2 shows the bit pattern of the coding scheme when the frequency request bit block is activated ( =I), the following bits will contain the frequency information that allows the pager to change to the frequency desired. When the frequency is not activated (= 0), the following bits will contain dataand the pageroperates in a normal mode.

I. HOW TO USE THE SYNTHESIZER PAGERS IN A NATIONWIDE NETWORK

   Each pager will be preset (pre-programmed) at its home city frequency; hence, when the pager is turned on the preset home frequency (local) is applied to the pager. The subscriber can receive pages (both local and from outside) at the home frequency.

When a subscriber wants to travel from city 1 to city 2, there will be 3 steps to be taken care in order to use the nationwide network:

1) Pager #ll w...