| This paper is mainly oriented to the improvement of network performance in the vehicle mobility management in the C-RAN enabled networked autonomous driving scenario.Through the study of the networked vehicle dynamic cooperative cluster clustering algorithm and its maintenance mechanism,the user centered vehicle RRH collaboration cluster is constructed and the real-time throughput of vehicles and the seamlessness of the network is improved.After the user’s RRH collaborative cluster is determined and in order to better improve the resource block allocation efficiency,a wireless network open controller for mobile network is designed and implemented based on open source software defined radio platform OAI(OpenairInterface),which supports the replacement of intelligent scheduling algorithm and system level simulation,and provides an effective verification platform for resource allocation scheme.Firstly,aiming at the problem of throughput limitation and network seamless of dense and high mobility networked vehicles in the scenario,a user centered overlapping clustering method of cooperative cluster RRH is designed.According to the channel state information of the RRH,the remote RRH cluster serving the user is selected based on the cooperative cluster construction algorithm of splitting and merging operation,and then the cooperative cluster is updated according to the efficient update strategy to keep the user connected with at least one RRH.Simulation results show that the scheme can effectively improve the throughput of networked vehicles and maintain the seamless user interface connection during the handover process.In order to verify the proposed seamless mobility strategy,considering the limitations of current network conditions and resource allocation mechanism,and the urgent need for a practical and effective platform for performance verification of various intelligent scheduling strategies,this paper designs a centralized wireless network controller to coordinate the scheduling of RRHs to allocate transmission resources.Based on the OAI platform,through the analysis of the main function process of the OAI source code and theentire implementation process of the scheduling function of the MAC layer,as well as the implementation of the DLSCH and ULSCH schedulers,the source code of the MAC layer of the OAI eNB was modified,and the receiving module was written by Python.Thus,an open controller for wireless networks is realized.The controller has an open interface and supports the replacement of the original resource scheduling algorithm of OAI MAC.The controller can effectively transmit scheduling information and return new scheduling results.Pass and replace the original scheduling result of OAI,and perform subsequent resource allocation operations.Aiming at the problem of improving the network performance and resource allocation efficiency in the mobility management of vehicles in the C-RAN networked autonomous driving scenario,this paper proposes a user-centric RRH dynamic collaboration scheme,which effectively improves the vehicle throughput and solves the user plane interruption problem during handover;the design and implementation of a wireless network controller based on the OAI MAC layer can transmit the original scheduling information,and return the processed scheduling results to replace the original scheduling results of OAI,providing intelligent scheduling algorithms An effective verification platform also lays a foundation for the follow-up study of resource allocation in vehicle mobility management under the scene. |
