1. NS2 simulation on video-conference packet transmission
Yuanliang ZHOU
Xun GONG
Kun LIN

2. Introduction
Aim: to investigate video-conference quality, against different queuing methods
Approach:
Investigate different queuing mechanism
Result prediction
Simulation in NS2 & analysis

3. Background Why QoS Primitives QoS Architecture Packet classification
Queuing & scheduling
Admission control, policy control,policing,etc.
QoS Architecture
DiffServ
Simplicity & scalability
IntServ

4. Approach Queue: tail-drop , RED, WRED, WIRED DiffServ implementation:
Policy
Edge router
Core router
Different Scheduling:
Round robin, Priority, Weighted Round Robin, WIRR

5. Implementation Topology Create sources, routers and destination
Create agent and generate traffic flow
Linking the nodes, create queues
Adding policies & set traffic properties
Simulate

6. Concept Cisco IOS QoS routing model Packet classification Pre-Queuing/
Scheduling/
Post-Queuing

7. Result(&prediction) Priority queuing
Base on packet classification
Treat differently
Round robin queuing(RR, or WRR, WIRR)
Server FIFO, in round robin fashion
Does little to ensure diff-level class packet service

8. Analysis
PRI RR
WRR, WIRR, etc.

9. Reference
Dhesikan, S 2001, Quality of Service for IP Videoconferencing Engineering White Paper
Fatin G. Sabbagha Yang Li Jinzhu Chen, 2004, Simulation of IP Packet Classification on Network Simulator (NS2), Michigan State University, U.S.A.
Bradley, R & Garcia, J, 2009, Best-Effort Quality-of- Service
Markovski, V 2003, Simulation and analysis of packet loss in video transfers using User Datagram Protocol
Rashed, M & Kabir, M 2001, A Comparative Study Of Different Queuing Techniques In Voip, Video Conferencing And File Transfer