Browse Prior Art Database

BASIC AFFILIATION IN MULTIPLE SITE SYSTEMS AFTER INFRASTRUCTURE FAILURE

IP.com Disclosure Number: IPCOM000008696D
Original Publication Date: 1998-Jun-01
Included in the Prior Art Database: 2002-Jul-03
Document File: 1 page(s) / 76K

Publishing Venue

Motorola

Related People

John Mistro: AUTHOR

Abstract

In multiple site trunking systems, a zone controller tracks what sites radios are located at. Radio "affiliations" allow the zone controller to properly include radios in calls needed when the zone controller receives call requests.

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MOTOROLA Technical Developments

BASIC AFFILIATION IN MULTIPLE SITE SYSTEMS AFTER INFRASTRUCTURE FAILURE

by John Mistro

BACKGROUND

  In multiple site trunking systems, a zone controller tracks what sites radios are located at. Radio "affiliations" allow the zone controller to properly include radios in calls needed when the zone controller receives call requests.

  If a site fails or enters site trunking mode (loses connectivity with the zone controller), each of the numerous subscribers will attempt to re-affiliate with an adjacent site. The result is the possibility of flooding one or more of the adjacent site's control channels, thereby rendering the adjacent site useless until the subscribers stop trying to affiliate.

PRINCIPLE OF OPERATION

  There are 3 basic scenarios covered by this article covered that would stop radio flooding of adjacent sites' control channels: I) a site enters site trunking; 2) The zone controller fails and/or resets;
3) a site completely fails.

1) In the case where a site goes into site trunking, but the Zone Controller is functioning: Each subscriber that leaves the site trunking site that can find a wide area site locks to the control channel for the wide area site, but does affiliate until the Zone Controller asks for the subscriber to afftliate. A subscriber that cannot find a wide area site stays where it is at and does nothing.

The Zone Controller attempts to find at least one member of each talkgroup at each of the adjacent sites, by polling for any member of a first talk- group at the adjacent sites and asking it to affiliate. When one member of the tirst talkgroup affiliates, the Zone Controller then polls for members of

a second talkgroup. When one member of the second talkg...