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    • 53. 发明授权
    • Method and apparatus for performing mobile assisted hard handoff between
communication systems
    • 用于在通信系统之间执行移动辅助硬切换的方法和装置
    • US5999816A
    • 1999-12-07
    • US816746
    • 1997-02-18
    • Edward G. Tiedemann, Jr.Tao Chen
    • Edward G. Tiedemann, Jr.Tao Chen
    • H04W36/14H04Q7/00
    • H04W36/14H04W36/0066H04W36/245H04W24/00H04W28/18H04W36/0083H04W48/16H04W76/028
    • 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.
    • 公开了一种用于在CDMA通信系统内进行通信系统之间的系统间硬切换或频间硬切换的方法和装置。 本发明的目的是降低在系统间硬切换期间掉话的可能性。 在硬切换尝试不成功的情况下,移动台将利用本发明的通信系统用于协助未来切换尝试的执行的信息返回到原始系统。 或者,在没有进行切换尝试的情况下,移动台监视目的地系统,然后利用用于辅助随后的切换尝试的信息返回到原始系统。 从监视CDMA系统返回的信息包括搜索由基站提供给移动台的特定列表中的偏移处给出的一个或多个导频的结果或基于预定搜索算法的一组偏移量的结果。