Physical layer security with dynamic behaviour cooperator based on coalitional game

Cooperation between wireless network users is a promising technique for improving the physical layer (PHY) security of wireless transmission in the presence of eavesdroppers. In practice, users may not always act as reliable cooperators. The misbehaviour of cooperative users may change the original security transmission condition. In this study, an algorithm that user splits or merges from coalition is proposed based on coalitional game with non-transferable utility. It obtains the maximum PHY security capacity of users in wireless networks even when there are users with dynamic behaviour. Simulation results show that a certain degree of misbehaviour can be tolerated by coalition. Analyses also show that the sensitivity of misbehaviour of the coalition is related to the position of users.