Robust CDMA soft handoff

Details Robust CDMA soft handoff Robust CDMA soft handoff

1997-05-30

2000-06-06

Le, Thanh Cong

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

455436, 455437, 370331, H04Q 720

Patent

active

060730218

ABSTRACT:
A method for increasing the success rate for soft handoffs, particularly under rapidly fluctuating fading conditions, using traffic channels of active set base stations. In one embodiment of the present invention, increased success rate for soft handoffs is achieved using a candidate base station, in addition to the active set base stations, to transmit a handoff command message to the mobile-telephone. Specifically, the handoff command message is transmitted by the active set base stations over the traffic channels assigned to mobile-telephone for communicating with the active set base stations, and by the candidate base station over the traffic channel assigned to the mobile-telephone for communicating with a primary base station. Additionally, a pilot signal may be transmitted by the candidate base station to enable the mobile-telephone to coherently demodulate the handoff direction message transmitted by the candidate base station.

REFERENCES:
patent: 5327577 (1994-07-01), Uddenfeldt
patent: 5392331 (1995-02-01), Patsiokas et al.
patent: 5530910 (1996-06-01), Taketsugu
patent: 5640414 (1997-06-01), Blakeney, II et al.
patent: 5722074 (1998-02-01), Muszynski

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