Author_Institution :
State Key Lab. of ISN, Xidian Univ., Xi´an, China
Abstract :
The trend of an increasing demand for a high-quality user experience, coupled with a shortage of radio resources, has necessitated more advanced wireless techniques to cooperatively achieve the required quality-of-experience enhancement. In this study, we investigate the critical problem of rate splitting in heterogeneous cellular networks, where concurrent transmission, for instance, the coordinated multipoint transmission and reception of LTE-A systems, shows promise for improvement of network-wide capacity and the user experience. Unlike most current studies, which only deal with spectral efficiency enhancement, we implement an optimal rate splitting strategy to improve both spectral efficiency and energy efficiency by exploring and exploiting cooperation diversity. First, we introduce the motivation for our proposed algorithm, and then employ the typical cooperative bargaining game to formulate the problem. Next, we derive the best response function by analyzing the dual problem of the defined primal problem. The existence and uniqueness of the proposed cooperative bargaining equilibrium are proved, and more importantly, a distributed algorithm is designed to approach the optimal unique solution under mild conditions. Finally, numerical results show a performance improvement for our proposed distributed cooperative rate splitting algorithm.
Keywords :
Long Term Evolution; cellular radio; cooperative communication; diversity reception; game theory; optimisation; telecommunication power management; LTE-A system; cooperation diversity; cooperative bargaining equilibrium; cooperative bargaining game; coordinated multipoint transmission; coordinated reception; distributed cooperative rate splitting; dual problem; energy efficiency; energy-efficiency tradeoff; heterogeneous cellular network; optimal rate splitting strategy; primal problem; rate splitting problem; spectral efficiency enhancement; Downlink; Games; Green communicatoin; Interference (signal); Power demand; Radio access networks; Wireless communication; Cooperative game; concurrent transmission; green communication; heterogeneous network; interference management;