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Multi-hop cellular network is a promising network architecture which incorporates the ad hoc characteristic into the cellular system aiming to improve current cellular network performance. Unlike single hop cellular network, due to involving autonomous devices in packet forwarding, routing process suffers from new security challenges which endanger the practical implementation of the network. One security challenge is that selfish devices do not relay other nodes' packets because cooperation consumes their resources and does not provide any immediate advantages. Selfish nodes degrade the network throughput, connectivity and power consumption. In order to stimulate the nodes' cooperation, the authors propose a micro-payment mechanism to reward the forwarding nodes and charge the communicating ones.
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