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Call control with transmission priority in a packet communication network of an ATM type

  • US 5,132,966 A
  • Filed: 03/23/1990
  • Issued: 07/21/1992
  • Est. Priority Date: 03/23/1989
  • Status: Expired due to Term
First Claim
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1. A call control method in a high-speed packet multiplex communication network including a transmission line with a predetermined bandwidth and accommodating a plurality of information sources, said information sources having various packet delivery rates over a range of between a peak rate and a lower rate than an average rate and demanding various transport performances, each of said packets comprising a header and a fixed bit length of digital information section, said call control method including steps of:

  • deciding whether a connection request from a specific one of said plurality of information sources is admitted or rejected to accept said specific information source when said connection request is admitted, said connection request requiring to transport specific packets from said specific information source through said transmission line; and

    transmitting, upon acceptance of said specific information source, specific packets from said specific information source onto said transmission line by a time-division multiplex fashion in an asynchronous transfer mode;

    wherein the improvement comprising;

    said information sources being preliminarily classified into two types, a first one of which demands a high transport performance while another second type being acceptable of a low transport performance, said first type being assigned with a first priority and said second type being assigned with a second priority, said connection request containing a specific one of said first and said second priorities corresponding to the type of said specific information source; and

    said deciding step comprising steps of;

    detecting the specific priority in said connection request;

    assigning a maximum bandwidth corresponding to said peak rate to said specific information source when said specific priority is said first priority;

    determining whether or not said predetermined bandwidth of said transmission line is larger than a sum of said maximum bandwidth and a bandwidth assigned to all ones of said information sources currently accepted; and

    admitting said connection request to accept said specific information source when said predetermined bandwidth is determined larger than said sum, said specific packets being preferentially transmitted onto said transmission line at said transmitting step.

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