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Feed-Forward Bandwidth Compensation in Connection-Oriented Networks with Rate-Dependent Sampling

100%

Ignaciuk P. , Bartoszewicz A.

tom Vol. 14, nr 1

79-95

In this paper, congestion control in a connection-oriented network supporting multiple data flows is considered. In the examined network the feedback information is received by each source once every M data packets sent by this source round trip time earlier. Since the rate is modified only, when this information becomes available, the transfer speed changes at irregularly spaced time instants. A new, nonlinear controller effectively combining the Smith predictor with the feed-forward compensation is proposed. Conditions for data loss elimination and full bottleneck link bandwidth utilization are formulated and strictly proved with explicit consideration of irregularities in the feedback information availability. Furthermore, due to the employed feed-forward compensation, the variation of the data transfer delay is reduced, which ensures favorable Quality of Service in the network.

Design of the state predictive model following control system with time-delay

84%

Wang D. , Wu S. , Okubo S.

tom Vol. 19, no 2

247-254

Time-delay systems exist in many engineering fields such as transportation systems, communication systems, process engineering and, more recently, networked control systems. It usually results in unsatisfactory performance and is frequently a source of instability, so the control of time-delay systems is practically important. In this paper, a design of the state predictive model following control system (PMFCS) with time-delay is discussed. The bounded property of the internal states for the control is given, and the utility of this control design is guaranteed. Finally, examples are given to illustrate the effectiveness of the proposed method, and state predictive control techniques are applied to congestion control synthesis problems for a TCP/AQM network.