QoE‐centric interference‐aware Stackelberg game for cache delegation relay in wireless multimedia communications

Abstract

Abstract Relaying multimedia with decent Quality of Experience (QoE) is paramount for future wireless networks. In this paper, the problem of multimedia cache relay delegation with device‐to‐device (D2D) communication interference is studied. A solution with gametheoretic cached multimedia relay is proposed considering the mutual interference between the downlink relay and the succeeding uplink communications. The interference between D2D and uplink is modelled in the game competition. In the proposed solution, the base station (BS) and relay device (RD) are treated as two rational game players, where the BS acts as the leader, and RD acts as the follower. The utilities of BS, and RD are modelled using the expected QoE of the user equipment (UE). Analytical modeling shows that the system achieves the desirable state by acquiring the Stackelberg game equilibrium between the BS, and RD. The models show that the RD gets positive incentives for relaying, the UE experiences better QoE through D2D communication, and BS achieves higher payoff. Various cases are quantitatively analysed whether the Nash Equilibrium exists with numerical discussion. Various relay to uplink ratios, amount of relay traffic, transmission distances between relay and uplink, as well as various numbers of interference uplinks are also studied.