Research On Small Cell Virtualization Technology For Wireless Heterogeneous Networks

5G generated as the data traffic in the network exponential growth.Each organization has a similar vision for 5G,mainly including high spectrum efficiency,energy efficiency and low cost:There are also some KPI parameters for rate,delay,peak rate and user mobility.In order to meet the vision of the 5G network,the denseness and heterogeneity of the network are becoming more and more prominent,and the coordination of the limited spectrum resources in the network becomes more and more difficult,the interference becomes more complicated,and there will have huge signaling storm.In order to solve these problems,5G proposed "4 + 1" key technology,namely,full-band technology,dense networking technology,new multiple access technology,large-scale antenna technology and emerging network architecture,in which dense network technology has become a major research Hot spots.Intensive networking technology includes three major research points:access and return design,interference management and suppression strategy research,residential virtualization technology,and residential virtualization technology,including soft sector technology,virtual layer technology and user-centric virtual cell technology.We focus on the macro-heterogeneous,micro-base station intensive deployment of the scene to study the user-centered virtual cell technology,and at the same time under the slight heterogeneous LTE and WiFi fusion research.This paper first studies the user-centric cell virtualization technology.In the intensive deployment of the Small Cell network,there are many issues in this system,such as too frequently switch,too large interference,too many signaling,and so on.In order to solve these problems,in the macro-micro-heterogeneous network,we introduce dual-connection technology and the protocol stack decoupling technology to build a user-centered residential virtual network architecture and network management system,and further,through resburce virtualization,combined with CoMP technology to achieve resource mapping and distribution,thereby reducing the user switch,improving the Small Cell edged user performance and the overall system throughput performance.This paper also studies the Small Cell heterogeneous network fusion.With the development of the network,the types of radio access network become more,users have more opportunities in the overlap of multiple networks,at the same time,the users need to manually select the transmission network,and the operation is too cumbersome.In order to solve this problem,we designed a Small Cell virtual network architecture for Small Cell-LTE and WiFi common deployment,and designed a virtual network management system and a spectrum resource abstraction method to achieve the LTE network and WiFi network resources integration management,users can choose to access a Small Cell-LTE network alone,or access to the WiFi network alone,or access to Small Cell-LTE and WiFi network simultaneously,which can improve network performance.Further research can consider the macro-micro same frequency deployment,taking into account the macro-micro-layer interference problem,to study the implementation of virtualization;for dual-link technology,consider the dual-link macro micro-base station between the diversion strategy,and further consider the overall system performance and the performance gain of micro base station when the macro base station to bear the micro-base station signaling;In addition,the integration of LTE and WiFi research,we can consider more parameters that affect the utility function settings in addition to speed and delay two evaluation indicators.