In multi-hop wireless networks, the mobile nodes usually act as routers to relay
other nodes' packets for enabling new applications and enhancing the network performance
and deployment. However, selfish nodes may not cooperate and make use of the
cooperative nodes to relay their packets, which has negative effect on the network fairness,
security, and performance. Incentive systems implement micropayment in the network to
stimulate the selfish nodes to cooperate. However, micropayment schemes have been ...