Multiplex communications – Wide area network – Packet switching
Patent
1991-10-04
1994-03-01
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 601, 370 79, 370 941, H04J 314
Patent
active
052914810
ABSTRACT:
Congestion in a high speed connection oriented packet network carrying bursty data and real time service is avoided by a novel in-call negotiation scheme for reserving bandwidth for real time calls and reserving buffer capacity for bursty calls.
For a real time call, a centralized call controller in each switch in the network determines which of its outgoing trunks has available to it the peak bandwidth needed to accommodate the call. Once one of these trunks is found, the call routing is set up so that the call is directed through that trunk and the peak bandwidth requirement of the call is allocated on that output trunk for the duration of the call.
The network contains one or more switches, each of which has a centralized call controller and a plurality of trunk controllers. The call controller routes calls from a plurality of input trunks to a plurality of output trunks, identifies kinds of calls, and allocates bandwidth on the output trunks. The trunk controllers perform in-call buffer reservation independent of the routing, identification, and bandwidth allocation performed by the call controller. This relieves the call controller of the extra burden of performing buffer reservation and it permits buffer reservation to be accomplished in a shorter period of time.
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B. T. Doshi et al., "Congestion Control for Bursty Data in High Speed . . . ," Presented at ITC Seminar on Broadband Technologies, Morristown, N.J., Oct. 5, 1990.
B. Doshi et al., "Memory, Bandwidth, Processing And Fairness . . . ", ITC Seminar on Teletraffic and Datatraffic in a Period of Change, copyrighted in Jun. 1991, pp. 153-159.
Doshi Bharat T.
Dravida Subrahmanyam
Einstein David S.
Harshavardhana P.
AT&T Bell Laboratories
Blum Russell W.
Indyk Eugene S.
Olms Douglas W.
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