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DYNAMIC OVER-THE-AIR RETRY TIMER FOR TRUNKED COMMUNICATION SYSTEMS

IP.com Disclosure Number: IPCOM000008698D
Original Publication Date: 1998-Jun-01
Included in the Prior Art Database: 2002-Jul-03
Document File: 2 page(s) / 111K

Publishing Venue

Motorola

Related People

Angel Favila: AUTHOR [+3]

Abstract

In wide area trunked communication systems, it takes a certain amount of time for the trunking infrastructure to process a subscriber unit service request. The subscriber unit has a service request retry timer which will expire if a response to its request is not received in a timely manner. When this retry timer expires, the subscriber unit will retry its service request.

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MOTOROLA Technical Developments

DYNAMIC OVER-THE-AIR RETRY TIMER FOR TRUNKED COMMUNICATION SYSTEMS

by Angel Favila, John Wolfe and Daniel McDonald

BACKGROUND

  In wide area trunked communication systems, it takes a certain amount of time for the trunking infrastructure to process a subscriber unit service request. The subscriber unit has a service request retry timer which will expire if a response to its request is not received in a timely manner. When this retry timer expires, the subscriber unit will retry its service request.

  The subscriber unit service retry timer is a static, preprogrammed value that is configured when the system is first deployed. As the system expands in size, this preprogrammed value may not provide adequate time for the infrastructure to respond to a service request. If adequate time is not provided, the result is the potential for retried requests by the subscriber unit.

PROBLEM

  As communication needs grow, trunked communication systems continue to increase in size. As customers expand their communication systems, more and more infrastructure devices must communicate with each other in order to determine the outcome of a subscriber unit service request. The addition of devices in the infrastructure result

in an increased delay in the ability for the infra- structure to respond to a subscriber's service request. This delay could result in the subscribers retrying its service request due to a lack of a timely response.

  Also, as these systems get larger, the communi- cation links connecting the infrastructure devices increases. With the increase in communication links comes the increased potential for the communication links delaying the processing of the subscriber service request. This delay could be caused by errors expe- rienced on the communication links. This delay

could result in the subscribers retrying its service request due to a lack of a timely response.

  Finally, as systems grow over time, more and more subscribers are added to the system. The addition of subscriber units to the system can result in the potential for an increase in the amount throughput delay to process a subscriber service requests due to increased subscriber traffic. Also, emergency situations which result in increased communication traffic can result in a temporary increase in service request processing time in the infrastructure. This increase in throughput delay could result in the subscribers retrying its service request due to a lack of a timely response.

  All of the above cases are undesirable since th...