Forward link inter-generation soft handoff between 2G and 3G CDMA systems
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United States of America Patent
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May 20, 2003
Grant Date -
Mar 28, 2002
app pub date -
May 20, 1999
filing date -
Dec 2, 1998
priority date (Note) -
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Abstract
In a CDMA cellular radiotelephone system, a soft handoff (SHO) is performed when a mobile station communicates with a new inter-generation base station, without interrupting communications with the old base station. Currently, a SHO can only be used between CDMA channels having identical frequency assignments and within the same system generation (i.e., 2G{character pullout}2G, or 3G{character pullout}3G, where 2G is a second generation system, and 3G is a third generation system). The proposed IS-2000 standard for a 2G{character pullout}3G handoff is a hard handoff or 'Break-Before-Make' procedure, which greatly reduces the quality of service (QOS). The present invention allows for SHO between second and third generation CDMA systems (2G{character pullout}3G and 3G{character pullout}2G), by modifying the proposed messaging structure. This provides a smooth service transition when a mobile station travels from one service area (i.e., 2G), to another service area (i.e., 3G), using the SHO or 'Make-Before-Break' approach.
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