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Call admission control method and cell flow monitoring method in the same method

  • US 4,984,264 A
  • Filed: 02/20/1990
  • Issued: 01/08/1991
  • Est. Priority Date: 02/22/1989
  • Status: Expired due to Term
First Claim
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1. A call admission control method wherein, in a network in which all information generated from terminals having various traffic characteristics are transmitted/switched by a fixed length block called a "cell" having a cell header including a virtual channel id, a terminal requesting communication declares destination address information and traffic characteristics of requested communication to said network upon set-up request, and an exchange in said network performs call processing for a request call on the basis of the destination address information and traffic characteristics declared by said terminal and a current offered load in said network, comprising the steps of:

  • grasping a current offered load of a line accommodated by said exchange in said network as an estimated cell flow A(i) (i is a positive integer) to be transmitted to said line in time units Δ

    t(i) (i is a positive integer of 1, 2, . . . , n) having a plurality of (n) predetermined lengths;

    grasping traffic characteristics of each call as a maximum cell flow a(j,i) (j is an identification number of a terminal) generated from said terminal in the time units Δ

    t(i) having the n lengths;

    calculating a predicted offered load of said line predicted to be obtained when the new request call is accepted as an estimated cell flow A'"'"'(i) (i is a positive integer) predicted to be transmitted to said line in the time unit Δ

    t(i) by using the cell flow A(i) (i is a positive integer) representing the current offered load of said line and the maximum cell flow a(k+1,i) representing the traffic characteristics of new request call;

    comparing the estimated cell flow A'"'"'(i) with a transmittable maximum allowable cell flow Amax(i) of said line obtained from a circuit capacity;

    accepting admission of the request call in accordance with the comparison result obtained in said comparison step; and

    rejecting admission of the request call.

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