Browse Prior Art Database

UPDATING THE TIME OF A PAGER GROUP

IP.com Disclosure Number: IPCOM000006774D
Original Publication Date: 1993-Mar-01
Included in the Prior Art Database: 2002-Jan-31
Document File: 1 page(s) / 74K

Publishing Venue

Motorola

Related People

Gregory L. Cannon: AUTHOR [+2]

Abstract

The following describes a technology to allow groups of pagers to have their time updated from a system. A pager's time is used to timestamp incoming messages. This time is set by the user, and as such, is subject to errored entry. Furthermore, the time could be lost due to pager internal clock inaccuracies as well as the pager losing power due to a low battery. What we describe is a manner of updating pager's clocks at any time using the system. Each update needs to be sent only once and should access all pagers on a system, yet not require the pagers to have a common paging address. This particu- lar method works within a POCSAG standard, and uti- lizes combinations of sync codes (which all pagers exam- ine), to modify a pager group's clocks.

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MOTOROLA INC. Technical Developments Volume 18 March 1993

UPDATING THE TIME OF A PAGER GROUP

by Gregory L. Cannon and William J. Macko

ABSTRACT

   The following describes a technology to allow groups of pagers to have their time updated from a system. A pager's time is used to timestamp incoming messages. This time is set by the user, and as such, is subject to errored entry. Furthermore, the time could be lost due to pager internal clock inaccuracies as well as the pager losing power due to a low battery. What we describe is a manner of updating pager's clocks at any time using the system. Each update needs to be sent only once and should access all pagers on a system, yet not require the pagers to have a common paging address. This particu- lar method works within a POCSAG standard, and uti- lizes combinations of sync codes (which all pagers exam- ine), to modify a pager group's clocks. INTRODUCTION

  The POCSAG signalling standard for paging uti- lizes a time division multiplexing addressing scheme designed primarily to increase battery life while provid- ing for minimal page queuing times. Every 512 bits a synchronization word is inserted to allow all of the pagers to remain in sync with the channel. This sync word is the basis of the new technology, since every pager must examine this sync word. This particular application will utilize a particular alternate sync word to signal the pager not only to maintain bit synchronization, but to send data to the pager that would allow it to change its time.

DETAILED DESCRIPTION

  This technology would utilize the alternate sync word with other common time related objects to change the pager's time. First, the sync word would contain 8 bits

of non changing information to allow for bit and word synchronization. The...