Research On A Number Of Admission Control And Resource Management Technologies For Nanocell System

With the explosive growth of mobile data business, current wireless network architecture has transformed from the single mode to the multimode heterogeneous network, users can adopt different access technology to communicate. The choice of access technology affects the frequency utilization, system capacity and interference to other systems, which is the research hotspot in the field of communications. Based on Nanocell structure, the paper designs D2D (Device-to-Device) communication admission control mechanism in TD-LTE (Time Division Long Term Evolution) and WLAN (Wireless Local Area Networks) resource management algorithm on these hotspot issues.LTE-Advanced has stipulated the way of D2D device discovery and communication. But the D2D communication mechanism has not formed a unified standard. The paper designs the access process in scene of transparent D2D communication, active D2D communication and joining D2D cluster communication. Compared with the current schemes, the access process reduces signaling overhead and the base station doesn’t need to master the whole network local information. The paper analyzes users access probability and designs admission control mechanism. The simulation results show that D2D admission control mechanism can provide optimal access probability even in the case of a large number of users access, and further reduce the access time delay by reducing signaling overhead.WLAN is a widely used mobile broadband access technology, which can share the flow pressure of cellular network, and reduce the communication charges. But WLAN is susceptible to interference, and its security is low. Based on architecture of AC (Access Controller) and AP (Access Point) in centralized WLAN, the paper designs resource management algorithm, including the power control and channel allocation algorithm based on interference avoidance. The simulation results show that the algorithm can significantly improve WLAN anti-interference ability and network capacity, at last the power control and channel allocation algorithm parameters settings is given based on measured data.Further research includes designing the unified signaling flow and frame format of multiple access methods based on heterogeneous network, D2D modulation mode and spectrum utilization way of physical layer, and WLAN strategy of rate adaptive to improve system performance.