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Fuzzy channel allocation controller having service quality insuring

  • US 6,792,275 B1
  • Filed: 04/25/2001
  • Issued: 09/14/2004
  • Est. Priority Date: 12/23/1998
  • Status: Expired due to Fees
First Claim
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1. A fuzzy channel allocation controller assuring a quality of service and used in a hierarchical wireless communication system, the system having a macro cell and a plurality of micro cells which includes a base station interface module, a resource estimator, a performance estimator and a fuzzy channel allocation processor;

  • wherein the base station interface module provides an interface circuit to be interfaced with a base station, and provides separate buffers for registering calls temporarily;

    the resource estimator calculates effective resources as a call occurs, including space channels and buffers; and

    the performance estimator adaptively estimates performance of the system;

    wherein the fuzzy channel allocation controller provides a threshold for allowing a call entering into the system to be adaptively adjusted according to/system conditions so that the calls are sustained in a predetermined quality;

    further, in allocating channels, the loads of the macro cell and micro cells are balanced so that the system has a higher channel utility, the fuzzy channel allocation processor being a two layer fuzzy logic controller;

    a first layer being a fuzzy allowable call threshold estimator and a second layer being a fuzzy channel allocation controller;

    the fuzzy allowable call threshold estimator having variables of handoff call failure rate and available resources, and a Sugeno displacement gradient method for use in adjusting the call threshold for achieving various priorities;

    in the second layer, the fuzzy channel allocator has the input variables of effective messages, then carries out a min-max deduction method, and establishes a final result representing whether the call is accepted and whether it is allocated with effective resources in the macro cell or micro cells.

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