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3/2/2001Hanoch Levy, CS, TAU1 What Quality of Service is About Hanoch Levy March 2001.

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Presentation on theme: "3/2/2001Hanoch Levy, CS, TAU1 What Quality of Service is About Hanoch Levy March 2001."— Presentation transcript:

1 3/2/2001Hanoch Levy, CS, TAU1 What Quality of Service is About Hanoch Levy March 2001

2 3/2/2001Hanoch Levy, CS, TAU2 Communications Network and QoS Communications Network is like a set of car roads Communication applications are like streams of cars. QoS deals with how to operate these roads in order to provide the cars with good quality of service.

3 3/2/2001Hanoch Levy, CS, TAU3 How does it look like

4 3/2/2001Hanoch Levy, CS, TAU4 Problems of Interest (Importance) 1.Traffic classification and characterization –Properties of traffic –Requirements of the system –Impact on the system

5 3/2/2001Hanoch Levy, CS, TAU5 Problems of interest (cont): 2. Policing and shaping – Monitor traffic for obeying the rules –Location: typically at network entrance 3. Node (“Intersection”) design: –Create fast intersections –Introduce mechanisms of prioritization into the intersections –Guarantee QoS to a traffic stream despite interference of other streams (fair queuing) –Location: In the nodes

6 3/2/2001Hanoch Levy, CS, TAU6 Problem of interest (cont) 4. Do not overflow your nodes (intersections) – estimate node capacity (Call Admission Control) 5. Efficient navigation of traffic (Routing) while obeying QoS 6. Managing your traffic: Virtual paths (transform your cars into trains…)

7 3/2/2001Hanoch Levy, CS, TAU7 Problem of interest (cont) 7. Coordinate through network nodes (reservations): Traffic engineering. 8. Traffic characterization.

8 3/2/2001Hanoch Levy, CS, TAU8 Course Structure 1.Lectures (show up). 2.Projects (exam?). 3.Class topics: See home page. 4.Register for mailing list. 5.Project topics: see last year, and talk to me.

9 3/2/2001Hanoch Levy, CS, TAU9 Course structure 1.Describe mechanisms as developed for ATM. 2.Examine mechanisms for IP.


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