(Data obrony: 2011-05-25) Szott, Szymon Wydział Elektrotechniki, Automatyki, Informatyki i Elektroniki
This dissertation deals with the problem of misbehaviour in IEEE 802.11 multi-hop ad-hoc networks. Nodes in such networks can misbehave by manipulating channel access parameters in order to assure a higher probability of data transmission. The IEEE 802.11 standard does not contain any incentives for nodes to conform to the specification. This is in particular true for the Enhanced Distributed Channel Access (EDCA) function which ensures Quality of Service (QoS) but also provides new means of misbehaviour. The following thesis is formulated: In multi-hop ad-hoc networks which use the EDCA function of the IEEE 802.11 standard, it is possible to improve traffic prioritising for the access categories defined in this standard in the presence of misbehaving nodes through the use of a QoS architecture which is able to detect and react to uncooperative node behaviour. The thesis is proved by the proposed detection method and reaction mechanism which can be used to identify and penalize misbehaving nodes in the network. Results have shown that both proposed solutions can be successfully used in single-hop and multi-hop networks. Furthermore, they can be incorporated into the IEEE 802.11 standard.
