초록 ▼

A method and apparatus for performing inter-system hard handoff between communication systems or inter-frequency hard handoff within a CDMA communication system is disclosed. The purpose of this invention is to reduce the probability of dropped calls during inter-system hard handoff. In the event th

A method and apparatus for performing inter-system hard handoff between communication systems or inter-frequency hard handoff within a CDMA communication system is disclosed. The purpose of this invention is to reduce the probability of dropped calls during inter-system hard handoff. In the event that a hard handoff attempt is unsuccessful, the mobile station will return to the original system with information which the communication system of the present invention uses to assist in the performance of future handoff attempts. Alternatively, with no handoff attempt made, the mobile station monitors the destination system then returns to the original system with information used to assist in subsequent handoff attempts. The information returned from monitoring a CDMA system consists of results of a search for one or more pilots given at offsets in a specific list provided to the mobile station by the base station or a set of offsets based upon a predetermined search algorithm.

대표청구항 ▼

[ We claim:] [1.] In a wireless communication system wherein a mobile station is moving from an area covered by an origination system into an area covered by a first destination system and wherein said mobile station has attempted to acquire said first destination system has failed, a method for avo

[ We claim:] [1.] In a wireless communication system wherein a mobile station is moving from an area covered by an origination system into an area covered by a first destination system and wherein said mobile station has attempted to acquire said first destination system has failed, a method for avoiding a loss of communication with said mobile station, comprising the steps of:attempting to acquire said first destination system by said mobile station;if said attempt to acquire said first destination system failed, then transmitting from said mobile station to said origination system a set of parameter data;receiving at said origination system said parameter data;generating at said origination system a search list of alternative destination systems in accordance with said parameter data; andattempting to acquire one of said alternative destination systems in accordance with said search list of alternative destination systems.