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07. TrafficControl

07. TrafficControl - Traffic Control 1 Overview Traffic...

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1 Traffic Control
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EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 2 Overview square6 Traffic demand > available resource box2 Potential congestion square6 Avoidance: before congestion box2 Provide more resource in advance box2 Reject certain requests box2 Operations in case of heavy load square6 Resolution: in case of congestion box2 Ask sources to decrease TX rate (implicit/explicit) box2 Prioritized QoS box2 Rerouting
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EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 3 Network Congestion
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EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 4 Call Admission Control (CAC) square6 Do not accept a new connection unless the network has sufficient capacity box2 QoS of the new connection is satisfied box2 Existing connections are not jeopardized square6 Functions at the time of call setup square6 Difficulties: box2 Utilization vs. QoS guarantee box2 Hard to define resource requirement
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EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 5 Multiplexing square6 Deterministic multiplexing square6 Statistical multiplexing
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EL536: Principles of Communication Networks © Kang Xi, Polytechnic University 6 Deterministic Multiplexing square6 The traditional means of bandwidth allocation in telecommunications networks square6 Each traffic type has an inherent bit rate (e.g., voice traffic = 64 kilobits per second) square6 Allocate precisely that bandwidth for each call, for the duration of the call
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