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IP.com Disclosure Number: IPCOM000008651D
Original Publication Date: 1998-Mar-01
Included in the Prior Art Database: 2002-Jul-01

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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.