Research On Delay QoS Modeling And Concurrent Multipath Transmission Implementation For 5G

The fifth generation mobile communication(5G)technology aims to support the explosive growth of mobile data traffic,the emergence of new services and applications,and it will also give users fiber-like access rate and "zero" delay experience.In order to achieve these goals and secure the successful deployment of the 5G networks,this thesis focuses on delay assessment as well as delay improvement.A cross-layer analytical model is first proposed based on the effective capacity model to approximate end-to-end delay functions in multi-carrier wireless communication system.The channel model is assumed to be Nakagami-m,the source arrival data confirms to a Bernoulli process and the data length is exponentially distributed.This mathematical model is verified via simulation under different fading channel conditions.A Newton-based estimation method is proposed to improve the estimation efficiency of the end-to-end delay in multi-carrier system.The conventional method uses the bisection method,which is unsuitable for multi-carrier system due to its high computational complexity.In order to further improve the estimation efficiency,we propose a new simplified effective capacity to avoid integral operations and then a simplified effective capacity model based on this simplified capacity.This accuracy of new simplified model is then verified via extensive simulation.We study a cross-layer multipath transmission technology based on the Netfilter mechanism within the Linux kernel to improve the end-to-end delay and bandwidth performance.We design and build a real transmission system platform based on this technology.The end-to-end delay of the system with different type of services and traffic loads is measured and analyzed by the effective capacity model.The high bandwidth transmission capability of this technology is tested.In summary,this thesis mainly focuses on the end-to-end delay analysis,including various new methods to improve the distribution function approximation of the end-to-end delay in wireless systems that use multi-carrier transmission technology.The end-to-end delay in a real concurrent multipath transmission system is then measured and analyzed,and the performance improvement using this technology in bandwidth aggregation is verified.