Browse Prior Art Database

“2nd Party Left Call” Indication For Private Call In DMO

IP.com Disclosure Number: IPCOM000010957D
Original Publication Date: 2003-Feb-05
Included in the Prior Art Database: 2003-Feb-05
Document File: 1 page(s) / 23K

Publishing Venue

Motorola

Related People

Eitan Bar: AUTHOR [+3]

Abstract

While conducting a DMO call, the Master has no indication regarding whether other MSs are currently listening to him or not. Further more, if a Slave participating in a call wishes to leave it, then it does so without signalling on the air-interface. This procedure, when used for a private call causes a problem since the Master in this case continues to talk, having no indication that the second party is no longer listening. (For this reason, the standard recommends not to use this procedure during an individual call other than for emergency reasons (ETS 300 396-3: "Tetra technical requirements for DMO; part 3: MS-MS AI protocol - section 6.2.4.2 item d).

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“2nd Party Left Call” Indication For Private Call In DMO

by

Eitan Bar, Dan Dory, Gabi Ofir

Abstract �         � � � � � � � � � � � � � �

While conducting a DMO call, the Master has no indication regarding whether other MSs are currently listening to him or not. Further more, if a Slave participating in a call wishes to leave it, then it does so without signalling on the air-interface. This procedure, when used for a private call causes a problem since the Master in this case continues to talk, having no indication that the second party is no longer listening.
(For this reason, the standard recommends not to use this procedure during an individual call other than for emergency reasons (ETS 300 396-3: "Tetra technical requirements for DMO; part 3: MS-MS AI protocol - section 6.2.4.2 item d).

What is the problem(s) to be resolved by or need(s) for your idea?

While conducting a DMO call, the Master has no indication regarding whether other MSs are currently listening to him or not. Further more, if a Slave participating in a call wishes to leave it, then it does so without signalling on the air-interface. This procedure, when used for a private call creates a problem since the Master in this case continues to talk, having no indication that the second party is no longer listening.
(For this reason, the standard recommends not to use this procedure during an individual call other than for emergency reasons (ETS 300 396-3: "Tetra technical requirements for DMO; part 3: MS-MS AI protocol - section 6.2.4.2 item d)
The problem may arise also under other circumstances, for example if the Slave during the call got out of range of the Master.
The idea is to give the Master in a private call a mean to be aware that the Slave is no longer listening (whether following an explicit user action of the Slave user or for any other reason). In addition the RF carrier resource will be spared using this method.

What is the idea you a...