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IP.com Disclosure Number: IPCOM000008175D
Original Publication Date: 1997-Jun-01
Included in the Prior Art Database: 2002-May-23
Document File: 2 page(s) / 98K

Publishing Venue

Motorola

Related People

Michael Berberich: AUTHOR [+2]

Abstract

The following paper will introduce a technique which is capable of easing the traffic channel usage in a radio communication system.

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MO-LA Technical Developments

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by Michael Berberich and Werner Zundel

INTRODUCTION

  The following paper will introduce a technique which is capable of easing the traffic channel usage in a radio communication system.

PROBLEM TO BE SOLVED

  It is often necessary to send voice messages of a long duration from one subscriber to another sub- scriber. The use of such messages of a long duration may prevent other subscribers from accessing or using the channels on the communication system. In such a situation, it is known that a mobile radio is able to transmit normally with a maximal duty cycle of 20%, i.e. 1 minute transmitting and 4 minutes receiving. This is typically not enough for the trans- mission of long messages. When using portable radios the battery will be stressed during the long transmitting phase. The concept described in this paper will help in this regard.

PROPOSED SOLUTION TO THE PROBLEM

  The principle diagram, shown in Figure 1, and a typical subscriber radio drawing, as shown in Figure 2, highlight the preferred realisation for implementation in subscriber radios of the communication system.

  The user of the subscriber radio can either decide to record a voice (audio) message to a special memory element implemented in the radio, by pressing a button, or alternatively to set up a normal call by pressing only the microphone push- to-talk (PTT)-button. After pressing the "voice record" button the radio enters a voice-storage mode which will enable the user to record analog

(voice) signals when pushing the P'IT at the micro- phone. After releasing the FlT, the record function is interrupted (record pause). During the recording procedure the radio user will have a "voice memory space indication" on the radio display which gives the information on how much memory space has already b...