Analysis on Congestion Control in Packet Switched Networks by Gradual Restrictions of Virtual Calls

Jun MATSUMOTO  Hiromichi MORI  

IEICE TRANSACTIONS (1976-1990)   Vol.E63   No.3   pp.184-191
Publication Date: 1980/03/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Switching Systems

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A congestion control method for international packet switched networks, which strengthens packet flow restrictions to virtual calls in a congested outgoing route in a switch gradually, is proposed. Basic traffic characteristics of the system under the proposed congestion control are analyzed theoretically. A simple queuing model is developed and state probabilities of the system under the congestion control are obtained analytically. Using the probabilities, equations to evaluated the performance of the congestion control such as throughputs and buffer overflow probabilities are derived. Several numerical examples are obtained and which show the effectiveness of the proposed congestion control method. Packet flow restrictions can be strengthened from virtual calls with low priorities first. By making the number of virtual calls which are controlled simultaneously small, the amount of processing loads for carrying out congestion controls can be decreased. A mechanism for realizing the proposed method is also discussed.