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The Impact of IEEE802.11g Legacy nodes on a IEEE 802.11n WLA

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by

Venessa Tjizumaue

on 29 September 2014

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Transcript of The Impact of IEEE802.11g Legacy nodes on a IEEE 802.11n WLA

By:
R. K. Kalaluka
V. Basson
S.V. Tjizumaue

Introduction
Wireless technology has become the latest trend in the IT industry due to the mobility it provides.
WLANs are popular because of its high flexibility, cost effectiveness and easily setup.
This presentation will focus on analyzing the performance of a network with 802.11n node (Scenario 1) and later introducing a 802.11g node (Scenario 2).

M.N. Ndiikongela
The Impact of IEEE802.11g Legacy nodes on a IEEE 802.11n WLAN
History and Improvements
Wireless LAN technologies are based on the IEEE 802.11standard which defines how to connect wireless devices to a network using an Access Point instead of network cables
802.11a, 802.11b, 802.11g, 802.11n
802.11n provides improved speed, throughput, wider ranges and MIMO which allows devices to sent and receive simultaneously

Media Access Delay
The graph above show the results of MAD in both scenario 1 and 2.
The graph indicates that in scenario 1 the waiting time to access the transmission medium is less than that of scenario 2.

Dropped Data (Retry Threshold Exceeded)
The graph indicates that in Scenario 1 the network is less congested compared to Scenario 2.
This is due to the presence of the RTS and CTS packets.
The retry threshold exceeded therefore is lower in scenario 1 network compared to scenario 2 network

Dropped Data (Buffer Overflow)

The graph below show that in Scenario 1 it takes more bits/second for the buffer to overflow and start dropping packets while in scenario 2 it takes less bits/second for the buffer to overflow

Throughput

The graph above indicate that in Scenario 2 there is lower throughput compared to Scenario 1 (all nodes 802.11n)because the network is congested with RTS and CTS

Conclusion
802.11n wireless nodes optimize the overall performance of the network
802.11g node introduced in a 802.11n network, degrades the performance of the entire network to that of 802.11g.
Thus in order to achieve optimal network performance within an 802.11n WLAN all nodes need to be 802.11n nodes.
Full transcript