Telephonic communications – Call or terminal access alarm or control – At switching center
Patent
1990-02-20
1991-01-08
Schrefver, Stafford D.
Telephonic communications
Call or terminal access alarm or control
At switching center
379220, 379 95, 370 54, H04M 336
Patent
active
049842641
ABSTRACT:
In a network in which all information from terminals having various traffic characteristics is transmitted/switched by a fixed length block including a virtual channel id, a terminal requesting communication declares destination address information and traffic characteristics of the requested communication upon set-up to a network. The exchange in the network expresses traffic characteristics of an individual terminal and an offered load (estimated cell flow) in the network. The traffic characteristics of each terminal are expressed as a maximum cell flow generated from the terminal in time units .DELTA.(i) (i=1, 2, . . . , n) having n predetermined lengths. The predicated offered load of the line supposing that a new request call is accepted is expressed as an estimated cell flow predicted to be transmitted to the line in the time unit .DELTA.t(i) by using traffic characteristic values of the calls currently transmitting on the line and a new request call. In a call admission control method, the estimated cell flow is compared with a maximum allowable cell flow obtained from a circuit capacity, thereby determining "accept" or "reject" of admission of the request call. In a cell flow monitoring method, a cell flow generated from a terminal in time units .DELTA.t(i) is counted in a plurality of time units .DELTA.t(i). If a cell flow in any one time unit .DELTA.t(i) exceeds a traffic characteristic value grasped beforehand by a network, "violation" is determined for the terminal and a regulation sequence is performed.
REFERENCES:
patent: 4696029 (1987-09-01), Cohen
Kabushiki Kaisha Toshiba
Schrefver Stafford D.
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