1. OPNET: TCP/UDP VIDEO PERFORMANCE COMPARISON OVER WLAN NETWORK
TELE Network Performance
OPNET: TCP/UDP VIDEO PERFORMANCE COMPARISON OVER WLAN NETWORK
Presented By:
Shiveen Pandita
Syed Azfar Hussain

2. Introduction
The OSI Model served as a Reference through which network communication can be achieved. Protocols were formulated based on the OSI Reference Model.
Two broad categories of protocols exist, connection-oriented and connectionless.
However, TCP and UDP became the de facto standards of the networking industry.
We shall focus on the performance output of using connectionless oriented (UDP), along with connection-oriented (TCP) protocol and see the impact on a Adhoc WLAN network.
Does one protocol hold superiority over the other?

3. OPNET
Type
Public (NASDAQ: OPNT)
Industry
Computer software, Computer hardware, Network and Application Management
Founded
1986
Headquarters
Bethesda, Maryland, USA
Key people
Marc A. Cohen, CEO & Chairman Alain J. Cohen, CTO & President
Revenue
 US$ 173 million (FY-12)
Net income
 US$ 18 million (FY-12)
Employees
Approximately 700 (2012)
Website
OPNET – Optimized Network Engineering Tools, recently acquired by Riverbed Technologies
GUI based Network Modelling and Simulation software.
OPNET works on issues related to Application Performance Management.
Expanding into the Network Performance Management arena by working in collaboration with Riverbed’s Cascade

4. OPNET – Simulation Parameters
OPNET IT Guru Academic Version 9.1.A was used for the simulation
Limitations:
Events
300m x 300m
Parameters:
Adhoc Network over IEEE b protocol
Data Rate: 11 Mbps
Nodes: 5/10/20
Typical Office Environment
Transport Layer Protocol: UDP/TCP
Video Resolution:
High – 128x240 px (15 fps)
Low – 128x120 px (10 fps)
Results:
Throughput
Delay

5. Results (Average Throughput)
5 Nodes
10 Nodes
20 Nodes
High Resolution Video
Low Resolution Video
High + Low Mixed

6. Results (Average Delay)
High Resolution Video
Low Resolution Video
High + Low Mix
5 Nodes
10 Nodes
20 Nodes

7. What if we double the buffer size?
Throughput
Delay
5 Nodes
10 Nodes
20 Nodes

8. Summary of Results THROUGHPUT DELAY DATA DROPPED
TCP is a better choice when dealing with few nodes and low traffic volume.
UDP is a better choice when dealing with more nodes and high traffic volume.
Doubling the buffer size actually improves TCP performance, but the level of improvement is very low in comparison to the cost of memory required.
DELAY
UDP is a better choice when delay is not a big constraint.
TCP delay increases at a lower magnitude with increasing nodes and volume of traffic in the network.
We can say that TCP “scales” better in terms of delay as the size of network increases.
DATA DROPPED
TCP never drops data… ever!

9. CONCLUSION Observations: Applications: Improvements:
Youtube currently uses Real-Time Streaming Protocol (RTSP) for invoking flash player data call, and then media is streamed via UDP:
Ok for regular low quality videos, but this would lead to granulation on high-quality videos.
Youtube buffers data before running video, it is suggested that TCP be used for High-Quality Video
Applications:
Active Applications:
Multi-room Video Conference/Meeting in a closed environment, such as an office building.
In a hospital environment where patients might interact with doctor-on-duty, or with other patients as a social activity. (bed-limited patients especially)
Military Applications: Reconnaissance squad provides live stream to assault squad.
Passive Applications:
Video/Picture sharing applications such as Snapchat, video/picture self-destruct after a certain period of time.
Video feed collection at a Bus Stop/Station for security purposes, especially at night.
Improvements:
How Effective Data rate/Throughput is affected in a Mobile Environment.