Browse Prior Art Database

iDEN PACKET DATA RECONNECTION

IP.com Disclosure Number: IPCOM000008651D
Original Publication Date: 1998-Mar-01
Included in the Prior Art Database: 2002-Jul-01
Document File: 4 page(s) / 153K

Publishing Venue

Motorola

Related People

J. Christopher Stanaway: AUTHOR

Abstract

Packet Data is a new service that is being added to the integrated Digital Enhanced Network (iDEN). iDEN currently supports Dispatch (Group Call, Private Call, Call Alert, etc.), Telephone Interconnect, Short Message Service (SMS), and Circuit-Switched Data services. Since iDEN is based on the European digital cellular standard, Global System for Mobile Communications (GSM), iDEN is also a cellular based system. This requires that subscriber units be able to move from cell to cell when idle and when involved in a service. For the existing services, there arc different criteria to determine when and to which cell the subscriber unit should move. When idle, the Cell Reselection criteria has already been defined. For the dispatch services, the Dispatch Reconnection has already been defined. For Telephone Interconnect, SMS, and Circuit-Switched Data, the Handover criteria has already been defined. Cell Reselection and Handover are similar in their decision making criteria, but do not consider the impact on data transfer when deciding when the subscriber unit should change cells. Dispatch Reconnection considers data transfer (i.e. voice activity), but the criteria used is not as flexible as Cell Reselection and Handover. Further. none of the existing criteria make use of a separate hystersis value for RSSI.

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MOTOROLA Technical Developments

iDEN PACKET DATA RECONNECTION

by J. Christopher Stanaway

  Packet Data is a new service that is being added to the integrated Digital Enhanced Network (iDEN). iDEN currently supports Dispatch (Group Call, Private Call, Call Alert, etc.), Telephone Interconnect, Short Message Service (SMS), and Circuit-Switched Data services. Since iDEN is based on the European digital cellular standard, Global System for Mobile Communications (GSM), iDEN is also a cellular based system. This requires that subscriber units be able to move from cell to cell when idle and when involved in a service. For the existing services, there arc different criteria to determine when and to which cell the subscriber unit should move. When idle, the Cell Reselection criteria has already been defined. For the dispatch services, the Dispatch Reconnection has already been defined. For Telephone Interconnect, SMS, and Circuit-Switched Data, the Handover criteria has already been defined. Cell Reselection and Handover are similar in their decision making criteria, but do not consider the impact on data transfer when deciding when the subscriber unit should change cells. Dispatch Reconnection considers data transfer (i.e. voice activity), but the criteria used is not as flexible as Cell Reselection and Handover. Further. none of the existing criteria make use of a separate hystersis value for RSSI.

  For Packet Data, the existing criteria are not applicable and new criteria for the Packet Data Reconnection needs to be defined. The Packet Data Reconnection criteria combines aspects of the Cell Reselection, Handover, and Dispatch Reconnection criteria to allow the SU to determine when and where it should changes cells. It incorporates the more flexible criteria of Cell Reselection and Handover while taking into account the data transfer aspect of Packet Data inherent in Dispatch Reconnection. The new criteria also uses a separate RSSI hysteresis that is lacking with the other criteria

and allows even greater flexibility when configuring an iDEN system.

  The following description assumes that the reader is familar with iDEN in general and specifi- cally the iDEN radio link control procedures defined in iDEN RF Interfwr: Radio Link Control.

  As when idle or involved in other services, while the Packet Data service is active, the sub- scriber unit continuously measures the outbound SQE and RSSI of the serving cell and its neighbor cells. The subscriber unit uses the following criteria to determine when and to which cell the subscriber unit should Packet Data Reconnect.

CHANNEL DISCONNECT OR FAILURE

  If the subscriber unit detects channel disconnect or channel failure of the CCCH or channel failure of the PCH, the subscriber unit changes to the highest- ranked unconditional foreground neighbor cell with pd-reconnection-class not equal to o/000. If no neighbor cells meet this criteria, then the subscriber unit goes idle (i.e. stops the Packet Data ser...