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A METHOD OF IMPROVING TRUNKED SYSTEM OPERATION USING A DIGITAL VOICE RECORDER

IP.com Disclosure Number: IPCOM000006762D
Original Publication Date: 1993-Mar-01
Included in the Prior Art Database: 2002-Jan-30
Document File: 2 page(s) / 94K

Publishing Venue

Motorola

Related People

Tanh Van: AUTHOR

Abstract

In a busy bunked radio system, mobile radio requests for voice channel often get a busy signal, causing the operator to spend time waiting for an available channel and to quickly use the available channel when it is granted before it is reassigned. If the operator's response is slow, the radio must request the voice channel again, causing extra loading on the system.

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INC. Technical Developments Volume 10 March 1993

A METHOD OF IMPROVING TRUNKED SYSTEM OPERATION USING A DIGITAL VOICE RECORDdR

by Tanh Van

  In a busy bunked radio system, mobile radio requests for voice channel often get a busy signal, causing the operator to spend time waiting for an available channel and to quickly use the available channel when it is granted before it is reassigned. If the operator's response is slow, the radio must request the voice channel again, causing extra loading on the system.

  One application of a digital voice recorder installed in a mobile radio is to make a busy system transparent to the operator and relieve the operator from waiting for a voice channel.

BRIEF DESCRIPTION OF A

TRUNKING SYSTEM OPERATION

   In a trunked radio environment, when a mobile radio requests a voice channel, the central controller assigns the unit one of its available voice channels. If a voice channel is not available, the central controller issues a busy signal to the mobile radio. When a voice channel becomes available, the central controller then assigns it to the unit. If the voice channel is not used within a short duration, the central controller will reclaim the voice channel.

PROBLEMS

  In a busy system, operators spend time waiting for an available channel, and have to quickly use the availa- ble channel when it is granted before it is reassigned, which means that the operator must babysit the radio. If the operator's response is slow, the radio must request the voice channel again, causing extra loading on the system.

  On top of that, the response time of the system is not instantaneous. There is a definite delay between a radio Push-to-talk switch press and the system ready for voice, due to the channel acquisition handshaking. It is possible for the operator to start talking before the

voice channel is acquired. In some tmnked systems, a feedback mechanism will let the operator know if a voice channel is not yet acquired, but this is cumbersome an...