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Reputation is considered to be one of the vital entities for maintaining   collaboration among wireless mobile nodes present in an ad hoc environment.   The nodes in MANET are dynamic and could change its behaviour drastically,   but establishing maximum level of cooperation between these nodes is highly   crucial. Moreover, the presence of selfish nodes has a greater impact on the   resilience of the network. Hence, a need arises for formulating a mechanism   that deals with these selfish nodes. In this paper, we contribute an Erlang   distribution based Conditional Reliability Mechanism (ECRCM) that aids in   detecting and isolating the selfish nodes present in an ad hoc environment.   This mathematical model makes the routing decision with the help of a   parameter called Erlang factor based Conditional Reliability Coefficient   (ECRC) determined for each and every mobile node present in the ad hoc   network. Extensive simulations were carried out through ns-2 simulator and   the analysis was based on performance metrics such as packet delivery ratio,   throughput, control overhead and total overhead. ECRCM also helps in framing   an optimal threshold range for selfish node detection. From the results, it   is obvious that the threshold range derived in our study remarkably   identifies maximum number of selfish nodes when compared to the selfishness   detecting parameters available in the literature

An Erlang factor-based conditional reliability mechanism for enforcing co-operation in MANETs