User-Centric QoE-Driven Power and Rate Allocation for Multimedia Rebroadcasting in 5G Wireless Systems
Shuan He, Wei Wang · 2016
Multimedia broadcasting applications become increasingly popular in future user-centric 5G networks. However, traditional multimedia data broadcasting scheme from the base station to devices is hard to satisfy the highly diversified Quality of Experience (QoE) requirement from users' perspectives. In this paper we propose a user-centric multimedia rebroadcasting scheme leveraging the device-to- device (D2D) communication model with strict energy constraint. Our method first optimizes the transmission energy of each rebroadcasting user device at physical layer, by taking modulation rate scaling under power limitation. Then we propose a cross-layer optimal method to improve the multimedia QoE for user applications by jointly considering the physical layer parameters and different channel information factors. The simulation results show the proposed rebroadcasting resource allocation approach achieves significant multimedia quality gain by allocating optimal transmission power and modulation rate under strict energy limitation. Performance gain of QoE is further enhanced when the differences of channel information between transmitting and receiving devices are available and leveraged.