Enhanced Medium Access Control Protocol for Resolving Node Misbehavior in Wireless Networks
In this research, two schemes that enhance the existing misbehavior handling strategy are proposed. The first scheme correlates misbehavior with the traffic characteristics generated by the node deviating from the stipulated protocol. It eliminates the stereotyping of deviation by deriving a mult...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English |
| Published: |
2007
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| Online Access: | http://psasir.upm.edu.my/id/eprint/5208/1/FSKTM_2007_8a.pdf http://psasir.upm.edu.my/id/eprint/5208/ |
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| Summary: | In this research, two schemes that enhance the existing misbehavior handling
strategy are proposed. The first scheme correlates misbehavior with the traffic
characteristics generated by the node deviating from the stipulated protocol. It
eliminates the stereotyping of deviation by deriving a multi-scale deviation
definition ranging from misbehavior to the underestimation of resource
allocation. The scale adaptively enables varying types of misbehavior
according to resource requirement. From the performance analysis, it was
determined that the scheme is successful in differentiating between
misbehavior due to selfishness and under-allocation of resource. In addition,
the scheme also enables nodes that are allocated with inadequate resource to
achieve higher share of throughput as per its requirement. The second proposed scheme further extends the existing misbehavior
handling strategy by detecting excessive allocation of resources. This scheme
effectively diminishes the wastage of resources by re-distributing them among
the rest of the nodes. The allocation of the resources is carried out on a First-
Come-First-Serve basis in order maintain fair characteristics of the 802.11
access mechanism. From the analysis, it was found that when this scheme is
employed, the presence of nodes that are over-allocated with resources enables
the rest of the nodes to increase their throughput share.
The performance analysis of the proposed schemes was conducted with the
use of a discrete-event simulator. The simulator was specifically developed for
wireless networks incorporating the proposed schemes. It simulates a wireless
network comprising non-deviating nodes and nodes that deviate from the
MAC protocol due to selfishness, under-allocation and over-allocation of
resources. The metrics employed to measure the performance of the proposed
algorithms are average throughput, fairness index, channel utilization and
throughput ratio.
From the analysis of the metrics, it is concluded that with the employment of
the proposed scheme, if a node deviates from the protocol and it is allocated
with inadequate resources, the scheme will adaptively allow the node to gain
the resource as per the degree of its resource under-allocation. On the other
hand, if it deviates due to over-allocation, the excess resources will be distributed to other nodes, hence, enabling for the increase of overall network
throughput. |
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