Browse Prior Art Database

METHOD TO START/STOP JOINING DISPATCH SESSIONS

IP.com Disclosure Number: IPCOM000009368D
Original Publication Date: 1999-Jun-01
Included in the Prior Art Database: 2002-Aug-20
Document File: 4 page(s) / 170K

Publishing Venue

Motorola

Related People

Senaka Balasuriya: AUTHOR [+2]

Abstract

Current dispatch systems do not provide a means for a user to hang up on a dispatch conversa- tion, join an existing session pertaining to it, and disable and enable incoming calls. Some dispatch systems provide a method for users to leave a call during emergency situations, but calls are restricted to a particular group and it disrupts the current call.

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Developments Technical 0 M MOTOROLA

  METHOD TO START/STOP JOINING DISPATCH SESSIONS

by Senaka Balasuriya and Mark Gannon

l BACKGROUND

  Current dispatch systems do not provide a means for a user to hang up on a dispatch conversa- tion, join an existing session pertaining to it, and disable and enable incoming calls. Some dispatch systems provide a method for users to leave a call during emergency situations, but calls are restricted to a particular group and it disrupts the current call.

  The inability to prevent unanticipated calls is a weakness in current dispatch systems. An incoming dispatch can arrive without warning and disturb a meeting. Although powering down the unit or mini- mizing the volume can prevent incoming calls, these are not practical solutions. Additionally, there are no means of exiting from (and re-joining) a current dispatch call. For example, it is not possible (within normal limits) to get out of a current group call, unless the call times out.

  l This method provides a means of preventing and enabling incoming dispatch calls, exiting a current dispatch session, and joining a current dispatch ses- sion.

PROBLEM

   Users cannot join an existing session (after exiting from a session) nor can they enable incom- ing calls (after disabling incoming calls)

METHOD

  Session - a dispatch conversation from the ini- tiator's fast FIT to the end of the hang time after the last ITT.

  Dispatch Controller - An entity that sets up, controls, and terminates dispatch sessions.

  Dispatch Unit - A unit that is capable of dis- patch conversation (e.g. Subscriber Unit, Mobile Station, and Computer application).

SOLUTION PROPOSAL

Scenario 1:

   A party initiates a dispatch call by sending a PIT request to the Dispatch Controller.

  l The Dispatch Controller sets up the dispatch session.

l The initiator starts talking.

  l A participant wishes to exit the session and activates a User Interface entity (i.e. button) on the Dispatch unit, which sends a "Stop Incoming Request" message to the Dispatch Controller.

  l A dispatch session is normally terminated only at expiry of hang time. Dispatch Units are incapable of normal termination of calls.

  l In a group call, a Dispatch unit cannot leave a current session before termination. It is inconve- nient not to be able to leave a session.

  l Dispatch users cannot prevent incoming calls. When a user initiates a call, it will setup and data
(e.g. voice) will flow instantaneously, and may catch the receiving parties unawares. A method to disable incoming calls will be convenient during meetings.

' Push-to-talk

  l The Dispatch Controller receives the message, updates its databases and instructs other parts of the system to update relevant records so that the particu- lar Dispatch Unit does not receive incoming calls. However, the Dispatch Unit is still provisioned to transmit/receive control messages. If a session had only 2 participants, the Dispatch Controller will

0 M0tomls, 1°C. ,599 289 June 1999

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