Joint microcell-based relay selection and RRM for LTE-A toward 5G networks

Relaying technology is one of the LTE-A issue that is considered the area of concern of several researches. Thus LTE-Advanced with relays uses several enhanced techniques in order to improve network performance like cell throughput enhancement and coverage extension. LTE-Advanced is considered as a real evolution of the LTE as it develops new technologies that allow to meet the proposed targets. The Radio Resource Management (RRM) mechanism and relay selection method can greatly contribute to this aim. In this paper, we jointly consider the problem of relay selection and RRM in order to improve the coverage and performance of mobile broadband wireless access service. We give a detailed description of the adopted LTE-Advanced system model with multiple user equipments assisted by one evolved Node B and multiple Relay Nodes. It is important to point out that the microcell technique is jointly adopted in the proposed RRM scheme to provide a better performance. The Microcell technique is considered as a densification approach massively employed in 5G radio access network systems like femtocell and picocell. Call admission control problem is also taken into account mainly when a minimal rate is needed to guarantee user satisfaction. By numerical results, we show that our proposed method could be a better choice for LTE-Advanced standard as it represents a trade-off between the fairness and the user throughput.