Game-based Resource Allocation In D2D Communications With Relay

The wireless networks have been shifting from voice services to mobile multimedia data applications and the shortage of spectrum resource is becoming much more serious. D2D communication technology has the advantages such as low power consumption, low time delay, high data rate and high spectrum efficiency, which can relieve the shortage of spectrum resource. However, the performance of D2D communication is affected by the distance and channel quality between D2D pair. With the help of relay, the distance between D2D pair can be longer and the channel quality can be better. So, the technology that combines D2D and relay technologies can make it possible for both increasing D2D communication distance and exploiting the advantages of D2D communication.In this thesis, two game theory-based resource allocation schemes are proposed in relay-based D2D communication system, which improve the spectrum efficiency and the total throughput. The contributions are summarized as follows.(1) In the first-hop link of a relay-based D2D communication system, a Stackelberg game-based resource allocation scheme is proposed. In this game, we group the relay node and the D2D users into a seller-buyer pair to make the cellular link and D2D link communicate reliably, which improves the total throughput. In the second-hop link, a resource allocation scheme is designed based on game theory and iterative water-filling method, we group the eNB and the relay into a seller-buyer pair to improve the total throughput.(2) A leader-follower Stackelberg game-based resource allocation algorithm is proposed to balance the throughtput of the two-hop links. The algorithm can maximize the throughput and decrease the users’transmission power to avoid the resource waste.(3) A coalition formation game-based resource allocation scheme is proposed in multiple relay-based D2D communication underlaying cellular networks. One relay sub-system teams up with another as a coalition and shares PRB with D2D communication in it. The game allows relay sub-systems to flexibly self-organize themselves into a stable state to improve system throughput.