Browse Prior Art Database

NATION-WIDE PAGING

IP.com Disclosure Number: IPCOM000006072D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2001-Nov-30
Document File: 3 page(s) / 163K

Publishing Venue

Motorola

Related People

Gary Grube: AUTHOR

Abstract

This invention is related to the method and apparatus to accomplish wide area paging. Currently there arc limited nation-wide paging services using one of a few dedicated nation-wide frequencies such as in the 900 MHz domestic paging allocation. A roaming pager simply monitors one frequency for messages targeted for its user. Using a common frequency at 900 MHz is possible since that band was previously unallocated. The popularity of this nation- wide paging service has steadily grown as the country and world get smaller. The capacity of these frequencies will eventually not be able to meet the demanded need. Certainly advanced digital modulation schemes will be used in concert with the present signalling schemes to make more efficient use of the available physical channels to support more users. These pagers, being more complicated, will certainly cost more than today's pagers. An alternative to provide both low cost pagers and an economic fixed end network to provide nation-wide service, is sought.

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MOTOROLA INC. Technical Developments Volume 12 April 1991

NATION-WIDE PAGING

by Gary Grube

   This invention is related to the method and apparatus to accomplish wide area paging. Currently there arc limited nation-wide paging services using one of a few dedicated nation-wide frequencies such as in the 900 MHz domestic paging allocation. A roaming pager simply monitors one frequency for messages targeted for its user. Using a common frequency at 900 MHz is possible since that band was previously unallocated. The popularity of this nation- wide paging service has steadily grown as the country and world get smaller. The capacity of these frequencies will eventually not be able to meet the demanded need. Certainly advanced digital modulation schemes will be used in concert with the present signalling schemes to make more efficient use of the available physical channels to support more users. These pagers, being more complicated, will

certainly cost more than today's pagers. An alternative to provide both low cost pagers and an economic fixed end network to provide nation-wide service, is sought.

  Current two-way commercial trunking systems can offer paging on a local only basis to dedicated paging channels that are shared with other trunked two-way dispatch traffic including both data and voice. Since neighboring trunking systems are granted different frequencies of operation, to avoid interference, wide area paging with today's single frequency nation-wide pagers is not possible. A multi-frequency pager is part of the solution. The second part involves using hundreds of established trunking sites to support this nation-wide paging service with the capacity of the shared trunked frequencies.

NATION-WIDE PAGING ON TAUNKING NETWORK

RGURE 1

NATION- WIDE PAOER RECEIVER

NATION- WIDE

L-l

PAGER

RECEIVER

CONTROLLER

0 Motorola, IX ,991 47

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MOTOROLA INC. Technical Developments Volume 12 April 1991

  A new nation-wide paging on trunking method is described which will use a new synthesized pager and a control channel protocol to move these pagers to the trunked system channels currently supporting their nation-wide paging needs.

  These trunked sites provide coverage over a pre- determined geographic area to many subscribing radio communications users. Some may choose to only subscribe to certain features over a certain geographic region to suit their needs. Many users acquiring many services from a common set of channel resources makes for a cost effective and frequency efficient means to provide communications services.

  Figure 1 shows an overall system diagram of the nation-wide paging on trunking network. We see that a master paging terminal is used to collect the paging information from users via the Public Switched Telephone Network (PSTN). As well, although not shown, pages could be collected remotely and forwarded to the master terminal for network distribution. As the...