Call control with transmission priority in a packet communicatio

Details Call control with transmission priority in a packet communicatio Call control with transmission priority in a packet communicatio

1990-03-23

1992-07-21

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 856, 370 941, H04J 326

Patent

active

051329662

ABSTRACT:
In a high-speed packet multiplex communication network including a transmission line with a predetermined bandwidth and accommodating a plurality of information sources, the 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, the sources are preliminarily classified into a plurality of types according to transport performances required and different transmission priorities are assigned to the different types, respectively. Bandwidths of sources of first priority and second priority are determined ones corresponding to the peak rate and the average rate, respectively. A virtual bandwidth may be calculated for the second priority source as a value between the peak and average rates. In response to connection requests from the sources, each of the connection requests is admitted when a bandwidth defined by the priority of each source is accepted in a residual bandwidth of the predetermined bandwidth, and the packets from the source of the first priority are preferentially transmitted to the transmission line, packets of the second priority source are transmitted when packets of the first priority source are absent. Thus, high bandwidth efficiency is insured while the high transport performance of the first priority source is maintained.

REFERENCES:
patent: 4823342 (1989-04-01), Morita et al.
Thomas et al., "Asynchronous Time-Division Techniques: An Experimental Packet Network Integrating Videocommunication," ISS (International Switching Symposium) '84 Florence, May 7-11, 1984.
Woodruff et al., "A Congestion Control Framework for High-Speed Integrated Packetized Transport", pp. 7.1.1-7.1.5. CH2535-3/88/000-0203, IEEE 1989.
Schaffer, "Synchronous and Asynchronous Transfer Modes in the Future Broadband ISDN", pp. 476..1-47.6.7. CH2538-7/88/0000-1552, IEEE 1988.

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