DETECTING SELFISH NODES
Mobile ad-hoc networks
(MANETs) assume that mobile nodes voluntary cooperate in order to work
properly. This cooperation is a cost-intensive activity and some nodes can
refuse to cooperate, leading to a selfish node behavior. Thus, the overall network
performance could be seriously affected. The use of watchdogs is a well-known
mechanism to detect selfish nodes. This is specially important on networks with sporadic contacts, such as
delay tolerant networks (DTNs), where sometimes watchdogs lack of enough time
or information to detect the selfish nodes. Thus, we propose collaborative
contact-based watchdog (CoCoWa) as a collaborative approach based on the
diffusion of local selfish nodes awareness when a contact occurs, so that
information about selfish nodes is quickly propagated.
Co-operative networking is
currently receiving significant attention as an emerging network design
strategy for future mobile wireless networks. The cooperation on these networks
is usually contact based. Mobile nodes can directly communicate with each other
if a contact occurs (that is, if they are within communication range).
Supporting this cooperation is a cost intensive activity for mobile nodes.
Thus, in the real world, nodes could have a selfish behaviour, being unwilling
to forward packets for others. Selfishness means that some nodes refuse to
forward other nodes’ packets to save their own resources.
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