Patent ID: 6122511
Filing Date: 2000-09-19
Classification: H04W,Y02D

Abstract:
A method for a mobile subscriber to control cell hand-off in a multicellular CDMA communication system while roving among individual cells, each cell associated with a base station which transmits a global pilot code, where the subscriber has a preexisting communication link with one of the base stations, comprising the steps of:a) monitoring transmission power of the preexisting communication level;b) receiving by said mobile subscriber a plurality of transmissions which include pilot codes transmitted by a plurality of candidate base stations besides the preexisting communication link;c) selecting a selected transmission from one of said candidate base stations and determining if its global pilot code is valid thereby identifying a selected candidate base station, if said global pilot code is not valid, repeating step b-c;d) acquiring said valid global pilot code from said selected base station;e) synchronizing an initial bi-directional handshake communication between said mobile subscriber and said selected base station with a minimized transmit power; andf) establishing a new communication link and abandoning said preexisting communication link to thereby define said new communication link as the preexisting communication link if said minimized transmit power between said mobile subscriber and said selected base station is less than the transmit power of said preexisting communication link.