Investigation On Radio Resources Management In LTE-Advanced With Carrier Aggregation

With the development of Mobile Internet and the application of4th G (the4th Generation Mobile Communication System) technologies, people have higher demands for the technologies of the mobile communication. Recently, some researches have indicated that most of the voice and data services occur indoors. Due to the loss between the walls in the building, how to enhance the coverage indoors and improve data rate for indoor users has been a very vital problem in the wireless communication. In the LTE-Advanced (LTE-A, Long Term Evolution Advanced) system, HeNB (Home eNB), or the Femtocell network, can increase the coverage indoors, while it also brings some new challenges, such as, the access and handover between MeNB (Macro eNB) and HeNB, the interference between Macrocell and Femtocell, the interference between target Femtocell and neighboring Femtocell,etc.In order to improve the users’bandwidth indoors, CA (Carrier Aggregation) technology is applied in the Femtocell network; this paper researches the radio resource management of the Femtocell network with Carrier Aggregation in LTE-A system. Based on using orthogonal resources between HeNB and MeNB, a distributed CCSCA (Component Carrier Selection and Collision Avoidance) scheme is proposed in this paper. In the proposed scheme, when choosing the CC (Component Carrier), it not only considers the outgoing interference from the target Femtocell to other Femtocells and the incoming interference from other Femtocells to the target Femtocell, but also considers the conflict situation where more than one Femtocell select the same component carrier. Besides improving the SINR (Signal to Interference plus Noise Ratio) of UEs (User Equipments) in Femtocells, this scheme can also increase the throughput of the Femtocell. In order to improve the utilization effiency of resources, Macrocell and Femtocell can reuse the same resources; whereas it has to consider the interference between Macrocell and Femtocell. Based on the interference pricing and payoff function, this paper also proposes a distributed power control scheme for maximizing the total utility of target cell. And with little impact on the utility of MUE (Macro UE), it can also improve the utility of HUE (Home UE).