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Handoff control with a pilot used in a cell of a neighboring cell in a CDMA mobile communication network on a service frequency of the neighboring cell

  • US 5,987,013 A
  • Filed: 04/10/1997
  • Issued: 11/16/1999
  • Est. Priority Date: 04/10/1996
  • Status: Expired due to Term
First Claim
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1. A handoff control method for use in a code division multiple access mobile communication network comprising a control station and first and second base stations connected to said control station and having a service area in which a mobile unit is movable and which is divided into a plurality of cells including first and second cells neighboring each other, said handoff control method comprising the steps of assigning first and second service frequencies to said first and said second base stations for traffic communication with said mobile unit, while said mobile unit is in said first and said second cells, detecting necessity of handoff between said first and said second service frequencies, and dealing with said handoff when said necessity is detected, wherein:

  • said assigning step assigns said second service frequency additionally to said first base station for an alternative use in said traffic communication and said first service frequency to said second base station for transmitting only a pilot signal;

    said dealing step dealing with, while said mobile unit moves in said first cell towards said second cell during the traffic communication with said first base station on said first service frequency, handoff from said first service frequency to said second service frequency when said necessity is detected.

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