Distributed Coalition Formation of Relay and Friendly Jammers for Secure Cooperative Networks

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In this paper, the authors investigate cooperation of conventional relays and friendly jammers subject to secrecy constraints for cooperative networks consisting of one source, one corresponding destination, one malicious eavesdropper, and several intermediate nodes. In order to obtain a higher secrecy rate, the source selects one conventional relay and several friendly jammers from the intermediate nodes to assist data transmission, and in return, it needs to make a payment. Each intermediate node here has two possible identities to choose, i.e., to be a conventional relay or a friendly jammer, which results in a direct impact on the final utility of the intermediate node.