Method for shedding traffic load in code division multiple access mobile communication system

  • US 5,781,861 A
  • Filed: 09/10/1996
  • Issued: 07/14/1998
  • Est. Priority Date: 12/06/1995
  • Status: Expired due to Term
First Claim
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1. A method for shedding traffic load in a code division multiple access mobile communication system, said method performing a soft handoff operation using the ratio of a forward link pilot signal power to the sum of all interference signals power to transfer a portion of traffic load in the present serving cell with a high traffic density to an adjacent cell with a low traffic density, comprising the steps of:

  • (a) checking the total amount of power allocated to forward code division multiple access channels and requesting all mobile stations in the present serving cell to update first and second handoff parameters, if the total amount of allocated power exceeds a threshold value of power which can be allocated to said mobile stations in the present serving cell;

    (b) updating the first handoff parameters of said mobile stations by decreasing them by a first predetermined value received from a network and the second handoff parameters of said mobile stations by increasing them by a second predetermined value received from said network and starting the soft handoff operation from a part of said mobile stations in the present serving cell to the adjacent cell if the a pilot signal power received from the adjacent cell to the sum of powers of all interference signals power is higher than said updated first handoff parameter; and

    (c) completing the soft handoff operation from said part of said mobile stations in the present serving cell to the adjacent cell if the ratio of the a pilot signal power received from the present serving cell to the sum of all interference signals power is lower than said updated second handoff parameter;

    whereby the amount of traffic load in the present serving cell with the high traffic density can effectively be shed to the adjacent cell with the low traffic density.

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