Design And Implementation Of Migration Mechanism And Virtualization For Super Base Station

With the explosive growth of data traffic and multiple business types,traditional base station hardware and software tight coupling development mode is no longer adapted to the future Mobile Internet development.Therefore,the industry has put forward the concept of virtual base stations.Different virtual base stations operate on a unified hardware platform,so that it can allow to share processing and radio resources,and on-demand scheduling of base station functions.In consequence,based on the team implementation of the super base station,this paper studies the base station virtualization technology,completes the design of the virtual platform deployment and dynamic migration mechanism,which provides important reference for future base station development.The main contributions are as follows:The research of existing base station virtualization technology is more theoretical than the actual hardware platform and operating system.Aiming at this problem,based on the common processor platform and KVM virtualization technology,according to the characteristics of base station task,deployed a virtualization platform and designed testing methods,to support the performance analysis and comparison of the virtualization platform.The experimental results show that the super base station is running smoothly,and the virtual base station can handle a variety of businesses efficiently,which meet the time delay and bandwidth of the wireless access network,what's more,it also can support Multi-virtual base station access,each virtual base station guarantees their normal processing task and does not affect each other.The current live migration cannot meet the real-time requirement of the base station processing task,and the total time and downtime of the migration will result in a decrease.To solve this problem,this paper proposes a migration mechanism based on repeated dirty page detection and multi-thread compression technology(XORMC).Using bitwise XOR to compare memory dirty pages before and after migration,and also assists in the use of multithreaded Zlib compression memory pages.Which can realize seamless migration of base station protocol stack without affecting normal business processing.The experimental results show that the XORMC mechanism can effectively reduce the total time and the downtime under different loads such as no-load,audio,video,and download services.Compared with the pre-copy migration mechanism,the total migration time decreased by 66.3%,67.1%,66.7%,60.5%,and the downtime decreased by 25%,30%,66.7% and 68.7% respectively.At the same time,the base station protocol stack has been operating normally and steadily during the migration process.There is no obvious packet loss,which conforms to the requirements of migration.