Browse Prior Art Database

LOW DUTY CYCLE SLOTTED PAGING FOR DISPATCH CALLS ON CDMA SYSTEMS

IP.com Disclosure Number: IPCOM000008868D
Original Publication Date: 1998-Sep-01
Included in the Prior Art Database: 2002-Jul-19
Document File: 1 page(s) / 80K

Publishing Venue

Motorola

Related People

Leigh Chinitz: 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 Developments

LOW DUTY CYCLE SLOTTED PAGING FOR DISPATCH CALLS

ON CDMA SYSTEMS

by Leigh Chinitz, Mike Needham and Duane Rabe

  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.

  CDMA cellular systems rely on broadcast pag- ing channels to notify remote units of phone calls directed to them. After the page is received by the designated remote unit, it may initiate signaling to inform the fixed end of its location, and set up the call. However, dispatch functionality requires a fast call setup time. In order to accomplish this, a unit which might become involved in a dispatch call needs to be constantly monitoring the system (usual- ly via a paging channel) to listen for a dispatch call announcement.

  In a CDMA system, however, such an activity could have serious battery drain implications for the subscriber unit involved. In CDMA for cellular

application, much greater power drain is associated with monitoring a channel, and consequently the paging channel pages a called unit far to rarely to provide the access time which is required for dis- patch applications. In contrast, subscriber units involved in dispatch calls on systems using different access technologies (FDMA, TDMA, etc.) can mon- itor a paging channel on a continual basis since the impact on battery drain for the subscriber unit is less severe.

This invention proposes a new type of paging channel...