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Variable bandwidth control system

  • US 4,825,434 A
  • Filed: 09/10/1987
  • Issued: 04/25/1989
  • Est. Priority Date: 09/10/1987
  • Status: Expired due to Fees
First Claim
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1. A method of controlling access to a communication link by traffic types that require different fractions of transmission facilities simultaneously comprising the steps ofseparating arriving traffic requests into bandwidth categories of narrowband and wideband;

  • allocating a first bandwidth portion of said link to narrowband request traffic types that require a smaller one of said fractions of transmission facilities, and allocating a second greater bandwidth portion of said link to wideband request traffic types that require a larger one of said fractions of transmission facilities;

    ignoring requests for said first bandwidth portion when the number of said requests is less than a minimum threshold N, where N is a positive integer;

    when at least N requests for said first bandwidth portion are present, deciding to serve narrowband or wideband requests by requiring that a fraction p of those decisions should favor the wideband, while the remaining 1-p should favor the narrowband; and

    when narrowband requests are to be served, serving narrowband requests jointly N×

    R at a time, or the number present if less than N×

    R, R representing the number of batches of N requests which can be served in parallel, but always in multiples of N;

    access to said communications link is permitted only when all requests in service have been completed.

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