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Browse Prior Art Database

SEQUENTIAL TRUNKED MOBILE RADIO AFFILIATION ALGORITHM

IP.com Disclosure Number: IPCOM000007624D
Original Publication Date: 1996-May-01
Included in the Prior Art Database: 2002-Apr-10
Document File: 2 page(s) / 94K

Publishing Venue

Motorola

Related People

Suresh Thadhani: AUTHOR

Abstract

Today on a Motorola trunked SMR, there exists a limitation on the amount of ISW traffic a SMR fixed end site can receive. This limitation is due to collisions between ISW's (Inbound Service Words). The ISW protocol utilizes the Slotted Aloha model. Although this model greatly reduces the probabil- ity of ISW collision, it cannot eliminate collision. Therefore, iftwo or more mobiles transmit simul- taneously, a high collision probability exists.

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SEQUENTIAL TRUNKED MOBliE RADIO AFFILIATION ALGORITHM

by Suresh Thadhani

  Today on a Motorola trunked SMR, there exists a limitation on the amount of ISW traffic a SMR fixed end site can receive. This limitation is due to collisions between ISW's (Inbound Service Words). The ISW protocol utilizes the Slotted Aloha model. Although this model greatly reduces the probabil- ity of ISW collision, it cannot eliminate collision. Therefore, iftwo or more mobiles transmit simul- taneously, a high collision probability exists.

  In current SmartZone sofiware, a condition exists where all mobiles which have aihliated with a par- ticular remote site will reaffiliate with that same remote site under specific conditions. This condi- tion could occur with a control channel roll, com- ing out of Failsoh, etc. Given the existence of this condition, it is probable that a subset of previously affiliated radios will reaffiliate simultaneously, and thus, the ISW collision probability increases.

  To prevent this situation I propose a method in which these reafftliations be in some type of sequen- tial order and thus decrease the ISW collision prob- ability, and also decrease the risk of the fixed end becoming inundated with affiliation ISW's which could potentially reset the fixed end controller.

Today all mobile radios send in ahiliation requests upon seeing control channel OSW information.

  The new method would minimize the mobile requests from colliding which eliminates retry requests. This in turn gives faster access to the sys- tem. This will also prevent the central controller from becoming inundated with affiliation ISW's thus freeing up processor time for critical applications such as call processing.

  Every mobile radio in the system has a unique ID. Today these ID's range in values from 0 to 65535. Each radio will have a timer. Upon receiving an ahiliation command from the fixed end (AI.L- RADIOS-AFFILIATE command), the radios will

check their timer and send in an affiliation...