Mobile communication hand-off control system and unit
a control system and mobile communication technology, applied in multiplex communication, wireless commuication services, high-level techniques, etc., can solve the problems of high power consumption, inability to communicate between the terminal and the base station bs-a, and inability to acquire neighbor lists, etc., to achieve efficient selection of the base station, increase the battery life, and reduce the power consumption of the terminal
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first embodiment
[0023]A cellular mobile communication network system according to a first embodiment of the invention employs a code division multiple access (CDMA) scheme. A base station transmits a pilot signal. The pilot signal is diffused by a predetermined diffusion code. An initial phase offset value that varies between base stations is assigned to a diffusion code. When establishing initial synchronization with a base station upon turn-on or out of synchronization, a mobile communication terminal searches all peripheral base stations close to the terminal, using a sliding correlator. Further, when establishing synchronization in preparation for hand-off, the terminal receives pilot signals transmitted from the active base station with which synchronization is now established, and from other peripheral base stations, and measures the reception quality of the signals.
[0024]FIG. 1 is a circuit block diagram illustrating the configuration of a mobile communication terminal according to the first...
second embodiment
[0049]In a second embodiment of the invention, when selecting a peripheral base station as a hand-off destination candidate, firstly, the peripheral base stations listed in the neighbor list NLa stored in the first memory area 21 are subjected to reception quality measurement. If no appropriate hand-off destination candidate is detected from the measurement results, the reception quality levels of the peripheral base stations listed in the expanded neighbor lists NLb and NLc are measured to select a hand-off destination candidate.
[0050]FIG. 3 is a flowchart illustrating the procedure and contents of base-station selecting control performed by a mobile communication terminal according to the second embodiment of the invention. Since the mobile communication terminal of the second embodiment has the same configuration as that shown in FIG. 1, the configuration of the second embodiment will be described with reference to FIG. 1.
[0051]The first memory areas 21 already stores a neighbor ...
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