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METHOD OF PREVENTING INTERFERENCE OF ADJACENT FREQUENCIES IN A CELLULAR SYSTEM BY SELECTION BETWEEN ADJACENT CARRIER FREQUENCY AND NON-ADJACENT CARRIER FREQUENCY

  • US 20020111163A1
  • Filed: 03/26/1999
  • Published: 08/15/2002
  • Est. Priority Date: 03/27/1998
  • Status: Active Grant
First Claim
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1. A method of preventing interference of adjacent frequencies wherein two cellular systems comprising a plurality of base stations and at least one mobile station utilizing frequency bands adjacent to each other for an uplink channel are provided in a same service area, and signal for the uplink channel used by a mobile station of one cellular system may cause interference of adjacent frequencies to a base station of the other cellular system, said method comprising the steps of:

  • at the mobile station of said one cellular system;

    measuring a received power of signals transmitted from the base station of the other cellular system; and

    at the base station and the mobile station of said one cellular system;

    if the measured value is larger than a threshold value, using a carrier frequency that is not adjacent to that of said other cellular system as a carrier frequency of an uplink channel.

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