Method for robust handoff in wireless communication system

Details Method for robust handoff in wireless communication system Method for robust handoff in wireless communication system

2007-06-19

2007-06-19

Eng, George (Department: 2617)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S436000, C455S522000

Reexamination Certificate

active

10020036

ABSTRACT:
A communication system that allows a soft handoff to be completed, even when the communications link between the active base station and the mobile station deteriorates before the mobile station has received the handoff direction message. The mobile station maintains a list of base stations that the mobile station is in communication with, referred to as an “Active Set”. In addition, the mobile station maintains another list of base stations that are proximate to the base stations in the active set. This list is referred to as the “Neighbor Set”. A memory within the mobile station includes information that would allow the mobile station to demodulate information transmitted from those base stations on the neighbor set. In accordance with the disclosed method and apparatus, the mobile station places a base station in the active set upon including the base station in a pilot strength measurement message (PSMM). The mobile station monitors transmissions from all of the base stations on the active set to receive a handoff direction message (HDM).

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Pollini, Gregory P. “Trends in Handover Design” IEEE Communications Magazine 34(3): 82-90 (Mar. 1996).

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