Joint resource allocation in secure two-way relay networks with QoS guarantee and fairness

In this paper, a novel resource allocation with QoS guarantee and fairness (RAQF) scheme is considered for orthogonal frequency division multiple access (OFDMA) two-way relay networks. Multiple source nodes exchange information with the assistance of an amplify-and-forward (AF) relay node (RN) in the presence of an eavesdropper. A joint power allocation, subchannel allocation and subchannel pairing scheme is proposed, aiming to maximize the secrecy capacity for legitimate users, and fulfill the diverse quality of service (QoS) requirements for different users and guarantee the fairness. RAQF scheme formulates the optimization problem into a mixed integer programming problem, and then solve it with constrained particle swarm optimization (CPSO), binary CPSO (B CPSO) and classic Hungarian algorithm. Simulations are conducted to assess the effectiveness of the proposed strategies.