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IMPROVED ALGORITHM FOR PROGRAMMING TWO-WAY RADIOS OVER THE AIRWAYS

IP.com Disclosure Number: IPCOM000005764D
Original Publication Date: 1988-Oct-01
Included in the Prior Art Database: 2001-Nov-02
Document File: 2 page(s) / 89K

Publishing Venue

Motorola

Related People

Jaime A. Borras: AUTHOR [+2]

Abstract

The next generation trunking subscriber controller needs to solve the problem of incorporating a relatively large memory space at a moderate cost and in a small area. One way of achieving these goals is to use a IM BIT (128K x 8) static RAM to incorporate the product software and features, as well as the customer informa- tion. To retain this data at all times, a battery back-up circuit is used. However, because a failure in the battery back-up circuit could occur, destroying the firmware and customer information, an improved method for pro- gramming the two-way radios over the airways was devised.

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MO7VROLA Technical Developments Volume 8 October 1988

IMPROVED ALG0RlTH.M FOR PROGRAMMING TWO-WAY RADIOS OVER THE AIRWAYS

by Jaime A. Borras and Tim M. Mitchell

   The next generation trunking subscriber controller needs to solve the problem of incorporating a relatively large memory space at a moderate cost and in a small area. One way of achieving these goals is to use a IM BIT (128K x 8) static RAM to incorporate the product software and features, as well as the customer informa- tion. To retain this data at all times, a battery back-up circuit is used. However, because a failure in the battery back-up circuit could occur, destroying the firmware and customer information, an improved method for pro- gramming the two-way radios over the airways was devised.

   The microcontroller will have a small amount of on-board memory with an algorithm to interrogate the check sum from the static RAM; if the check sum is not correct, then it assumes that something has gone wrong with the software and it requests the system central controller to download via the airways the informa- tion into the static RAM.

   However, before the information is downloaded, the central controller verifies the authenticity of the re- quester, and it fetches the firmware and user information from the trunking code management system (TCMS) or the system manager.

   Once the central is ready to start downloading the information, it will request the status of the receiver signal strength indicator(RSSI) from the two-way radio. The radio would then code and transmit the RSSI infor- mation to the central. The central controller analyzes the RSSI data and then it chooses an adequate error detec- tion and correction algorithm with the objective of optimizing the information throughput with minimum chan- nel loading.

   In a particular case, af...