Browse Prior Art Database

AFFILIATION DATABASE RESTORATION USING REMOTE SITE AFFILIATION TIME STAMPS

IP.com Disclosure Number: IPCOM000007923D
Original Publication Date: 1996-Nov-01
Included in the Prior Art Database: 2002-May-06
Document File: 1 page(s) / 60K

Publishing Venue

Motorola

Related People

Briana Hoffman: AUTHOR

Abstract

A wide area radio communication system may contain a central controller (Zone Controller), remote sites (such as 6809 sites or Intellirepeaters), and subscriber units (such as radios). In systems where subscriber unit roaming is not controlled by the lixed end (by the zone controller for example) but by the subscriber unit itself, it is usually assumed that loca- tion updates from different remote sites will be received in the order in which contact was made. Subscriber location information, also called alftlia- tion information, is updated by the central control- ler to reflect the location from which the last loca- tion update which was received.

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MO7OROLA Technical Developments

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AFFILIATION DATABASE RESTORATION USING REMOTE SITE AFFILIATION TIME STAMPS

by Briana Hoffman

immediately Subscriber A then roams to site 3. Site 3 reports the presence of subscriber A to the fixed end which updates the subscriber's location infor- mation to reflect site 3. When the communication path to site 2 is again established, site 2 must update the central controller about changes which occurred to subscriber information during the communica- tion path failure. At this time, site 2 may incorrectly report the presence of subscriber A. The central con- troller must be able to determine the true location of subscriber A.

BACKGROUND

  A wide area radio communication system may contain a central controller (Zone Controller), remote sites (such as 6809 sites or Intellirepeaters), and subscriber units (such as radios). In systems where subscriber unit roaming is not controlled by the lixed end (by the zone controller for example) but by the subscriber unit itself, it is usually assumed that loca- tion updates from different remote sites will be received in the order in which contact was made. Subscriber location information, also called alftlia- tion information, is updated by the central control- ler to reflect the location from which the last loca- tion update which was received.

SOLUTION

PROBLEM

  When a communications failure occurs, these location updates may occur in incorrect order which could lead to incorrectly updated locati...