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Browse Prior Art Database

ROAMING CAPABLE PAGER OPERATIONAL IN NON-ROAMING AREAS

IP.com Disclosure Number: IPCOM000008426D
Original Publication Date: 1997-Dec-01
Included in the Prior Art Database: 2002-Jun-13
Document File: 1 page(s) / 83K

Publishing Venue

Motorola

Related People

Xuming Chen: AUTHOR [+2]

Abstract

Multifrequency roaming pagers described in Motorola's FLEXTM roaming specification lock to radio frequencies to receive messages only when those frequencies carry an NID or SSID which matches one programmed in the pager. This precludes the pager from receiving messages in systems which do not carry NIDs or SSlDs (non- roaming systems). The result of this is that these roaming pagers cannot receive service in areas which have existing infrastructure that is not roaming capable as specified by FLEXTM. None of the world's existing FLEXTM infrastructure is FLEXTM multifrequency roaming capable. Therefore pagers built for the new roaming systems would not be functional in existing FLEXTM systems.

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MOTOROLA Technical Developments

ROAMING CAPABLE PAGER OPERATIONAL IN NON-ROAMING AREAS

by Xuming Chen and Garland Phillip

  Multifrequency roaming pagers described in Motorola's FLEXTM roaming specification lock to radio frequencies to receive messages only when those frequencies carry an NID or SSID which matches one programmed in the pager. This precludes the pager from receiving messages in systems which do not carry NIDs or SSlDs (non- roaming systems). The result of this is that these roaming pagers cannot receive service in areas which have existing infrastructure that is not roaming capable as specified by FLEXTM. None of the world's existing FLEXTM infrastructure is FLEXTM multifrequency roaming capable. Therefore pagers built for the new roaming systems would not be functional in existing FLEXTM systems.

  This paper describes a multifrequency roaming capable pager which has the additional ability to receive messages on channels which carry no NIDs or SSIDs. This function may be automatic or it may be manually activated. Three methods/behaviors are described below.

AUTOMATIC BEHAVIOR

  When no matching 1Ds are present on channels in a region, the pager can monitor its assigned frame on a channel that is present without matching an NID or SSID. This behavior can be specific to one or more of the frequencies stored in the pager. In a simple implementation, a pager may have a frequency in its internal frequency list which corre- sponds to that used for a FLEXTM system in a region in which no FLEXTM multifrequency roam- ing service is available. When this pager enters that region, it will find no channels which carry FLEXTM roaming IDS matching those stored inter- nally, and will then lock to the frequency in that region. The pager will continue to check for other channels, looking for ID matches, but will be able to receive messages on the non-roaming channel as well. This is an example of a pager automa...