Inter-BBU control mechanism for load balancing in C-RAN-based BBU pool

In order to increase the network resource utilization and improve network performance, also to reduce unnecessary inter-BBU routing overhead, the resource management between baseband pools of C-RAN (Cloud Radio Access Network) is studied in this paper. An overall scheduling scheme from user terminals to metropolitan area network edge for C-RAN is first proposed. The scheme takes advantage of user resource information shared in baseband resource pool in C-RAN wireless network, and sets up a Controller to implement the inter-BBU resource management. By comparing the local UE required load and local BBU load threshold, the controller determines whether to execute inter-BBU control mechanism, and then establishes a communication link according to the results of the judgment. Obviously, the specific inter-BBU control mechanism is also proposed to solve the problem of inter-BBU load balancing in BBU pool. It is divided into two steps which include ensuring the purpose BBU location and designing the control mechanism of resource scheduling from local BBU to purpose BBU. Simulation results evaluate the feasibility of this mechanism which can improve the network performance significantly.