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.