Fair access of multi-priority traffic to distributed-queue dual-

Details Fair access of multi-priority traffic to distributed-queue dual- Fair access of multi-priority traffic to distributed-queue dual-

1990-09-24

1992-05-19

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 8511, H04J 302

Patent

active

051154307

ABSTRACT:
Bandwidth balancing is accomplished to DQDB networks that handle multi-priority traffic by causing each node to throttle its own rate of transmission in accordance with the priority of the data that the node transmits. In accordance with one approach, each node limits its throughput to the product of a bandwidth balancing factor (which is a fraction that varies according to the priority level of data) and the unused bus capacity. When parcels of different priorities are received within each node, the parcels are processed in priority order. In accordance with another approach, all active parcels within a node are handled concurrently and receive some bandwidth. The throughput of each parcel in a node is limited to the product of the bandwidth balancing factor and the unused bus capacity. In accordance with still another approach, each traffic parcel limits it throughput to the product of the bandwidth balancing and the bus capacity unused by parcels of equal or higher priority. This scheme allocates bandwidth first to the higher-priority parcels, then allocates the leftovers to the lower-priority parcels. Lower-priority parcels have no effect on the steady-state throughputs of higher-priority parcels.

REFERENCES:
patent: 4977557 (1990-12-01), Phung et al.
patent: 5001707 (1991-03-01), Kositpaiboon et al.
"Access Protection for Fairness in a Distributed Queue Dual Bus Metropolitan Area Network", J. Filipiak, 1989 IEEE, pp. 0635-0639.
"The QPSX Man", M. Newman, Z. L. Budrikis and J. L. Hullett, IEEE Communications Magazine, vol. 26, No. 4, Apr. 1988, pp. 20-28.
"The p.sub.i Persistent Protocol for Unidirectional Broadcast Bus Networks", B. Mukherjee and J. S. Meditch, IEEE Transactions on Communications, vol. 36, No. 12, Dec. 1988, pp. 1277-1286.
"Bottleneck Flow Control", Jeffrey M. Jaffee, IEEE Transactions on Communications, vol. COM-29, No. 7, Jul. 1981, pp. 954-962.
"A Fair MAC Access Scheme":, M. A. Rodrigues, Document Number 802.6-88/62, Contribution to the IEEE 802.6 Working Group.
"A Non-Unity Ratio Bandwidth Allocation Mechanism--A Simple Improvement to the Bandwidth Balancing Mechanism", M. Spratt, Nov. 3, 1989, Contribution to the IEEE 802.6 Working Group.

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