The presence of selfish nodes in 802.11 networks is a problem because their behaviour can be harmful for everyone. Therefore, it is important to detect selfish nodes. However, detection alone cannot prevent selfish behaviours. Actions must be initiated against selfish nodes. The main goal for these actions is to punish selfish behaviour. If a selfish node is rational, the potential punishments will incite the selfish node to behave cooperatively.
In this thesis, selfish nodes have modified their implementation of the 802.11 protocol. Selfish nodes have reduced their backoff values. This results with a higher bandwidth for these nodes. Reduced backoff values can be done by using a narrower contention window. Contention windows, as well as all communications between nodes, are specified by the 802.11 protocol. Thus, a selfish node would simply have to deviate from the protocol specifications.
To resolve this problem, detection methods and actions against selfish nodes are developed. If the proposed solutions are applied, networks containing selfish nodes may perform better.
| Date | 22 Dec 2011 |
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| Original language | French |
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| Awarding Institution | - École de technologie supérieure
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| Supervisor | Jean-Marc Robert (Supervisor) |
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Boyer, S. (Author),
Robert (Supervisor),
22 Dec 2011Student thesis: Master's thesis › Master in Engineering: Engineering