System and method for GSM hard handoff

Details System and method for GSM hard handoff System and method for GSM hard handoff

2007-07-31

2007-07-31

Eng, George (Department: 2617)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S442000, C370S331000

Reexamination Certificate

active

10871232

ABSTRACT:
A GSM1×-to-GSM handoff feature allows a GSM1× subscriber with a dual-mode (GSM1× and GSM modes) handset to seamlessly roam from GSM1× coverage areas to GSM coverage areas. This functionality is facilitated by the GSM1× system design which integrates a CDMA RAN with a standard GSM core network. The GSM1× system is built using standard CDMA as its air interface and an unmodified CDMA RAN with a standard IOS interface to the MSN. The only modifications are done at the MSN and the MS.

REFERENCES:
patent: 5978679 (1999-11-01), Agre
patent: 6438117 (2002-08-01), Grilli et al.
patent: 6594489 (2003-07-01), Holman
patent: 6704581 (2004-03-01), Park et al.
patent: 6804519 (2004-10-01), Czaja et al.

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