Browse Prior Art Database

TALK GROUP PAGING IN A CDMA DISPATCH SYSTEM

IP.com Disclosure Number: IPCOM000008876D
Original Publication Date: 1998-Sep-01
Included in the Prior Art Database: 2002-Jul-19
Document File: 2 page(s) / 88K

Publishing Venue

Motorola

Related People

Michael Needham: AUTHOR [+3]

Abstract

In order to implement dispatch group call func- tionality on a CDMA system, some means is needed of notifying the multiple members of a talk group, which may be located in multiple cells, of a group call in progress, and to direct them to the proper traffic channel. In addition, means are needed for locating the multiple members of a talk group, so that the dispatch audio is directed to only those cells with talk group members present, thus conserving system resources.

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MOTOROLA Technical Deve1opment.s

TALK GROUP PAGING IN A CDMA DISPATCH SYSTEM

by Michael Needham, Leigh Chinitr and Timothy Wilson

  In order to implement dispatch group call func- tionality on a CDMA system, some means is needed of notifying the multiple members of a talk group, which may be located in multiple cells, of a group call in progress, and to direct them to the proper traffic channel. In addition, means are needed for locating the multiple members of a talk group, so that the dispatch audio is directed to only those cells with talk group members present, thus conserving system resources.

directed to them. After the page is received by the designated remote unit, it may initiate signalling to inform the fixed end of its location, and set up the call. However, in the context of group calls on a dis- patch system, no means exist for notifying and locating the multiple members of a talk group (of a dispatch call directed to them.

  As described in TIAEIAE-95-A (appendix B), the message flows for a mobile terminated call look like:

CDMA cellular systems rely on broadcast pag- ing channels to notify remote units of phone calls

Mobile Station Base Station

Sends page response message

Sets up traffic channel -Paging Channel=

Receives N(5m) consecutive valid frames

Begins sending the Traff%z Channel ureamble Begins &smitting null Traffic Channel Data =Forward Traffic Channelti

Begins processing primary traffic in accordance with Service Option 1

Starts ringing

User answers call Stops ringing Sends connect order

Begins sending primary traffic packets from the Service Option 1 application (User conversation)

*Paging Channel*

*Access Channel*

Sends page message or slotted page message

Sets up traftic channel Begins sending null traffic channel d...