Browse Prior Art Database

NON-SCANNING NATIONWIDE PAGING SYSTEM

IP.com Disclosure Number: IPCOM000005758D
Original Publication Date: 1988-Oct-01
Included in the Prior Art Database: 2001-Nov-02
Document File: 2 page(s) / 106K

Publishing Venue

Motorola

Related People

Joseph D. Caci: AUTHOR [+2]

Abstract

Current nationwide paging systems can be classified in two categories. A single frequency can be used for the entire nationwide system. There are currently three channels in the 930MHz band that are allocated by the F.C.C. for this purpose. A current system that uses this approach consists of many remote paging transmit- ters tied together in a network via a satellite link. This results in the ability to use a standard, single frequency pager in a nationwide system. However, there are inherent limitations to channel capacity which will place an upper limit on the numer of nationwide pages that can be sent. Also, there can only be three nationwide car- riers that can participate in this form of nationwide paging.

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M-ROLA Technical Developments Volume 8 October 1988

NON-SCANNING NATIONWIDE PAGING SYSTEM

by Joseph D. Caci and Fernando Gomez

   Current nationwide paging systems can be classified in two categories. A single frequency can be used for the entire nationwide system. There are currently three channels in the 930MHz band that are allocated by the F.C.C. for this purpose. A current system that uses this approach consists of many remote paging transmit- ters tied together in a network via a satellite link. This results in the ability to use a standard, single frequency pager in a nationwide system. However, there are inherent limitations to channel capacity which will place an upper limit on the numer of nationwide pages that can be sent. Also, there can only be three nationwide car- riers that can participate in this form of nationwide paging.

   A second type of nationwide paging consists of multi-channel scanning systems. For these systems, several frequencies are scanned for a nationwide signalling protocol. Upon detecting this protocol, the pager locks on to the channel to search for its unique address. This has the advantage of allowing a network of independent affiliates to form a nationwide paging network. Most of these systems use Regional Commcn Carrier paging channels. One system uses the SCA subcarrier of commercial FM broadcasting stations. Both systems have the advantage that many possible nationwide and regional networks can develop in the future. However, these systems have limited paging throughput. This article describes a possible non-scanning nationwide, multi- frequency paging network that significantly increases paging throughput, allows for very simple paging net- works, and maintains excellent battery life.

DESCRIPTION

   Recent developments in pager technology can be used to simplify the infrastructure of a nationwide multi- frequency paging system. Three elements are critical to this approach. First, the development of frequency syn- thesized paging receivers allows for multi-channel operation. This is the receiver technology currently used in scanning pagers. Microcomputer control of the frequency synthesizer can allow for the selection of any pag- ing channel within a given receiver band. For instance, in the United States the overwhelming majority of VHF wide area paging carriers operate within the 152460MHz band. Another recent advancement in paging technology is the inclusion of efficient real time clock circuits. These circuits allow the pager to keep time in a manner identical to that of a digital watch. The third element is over the air programming an...