QoS Modeling And Its Application For 5G/B5G Systems

In recent years,with the rapid development of 5G/B5G wireless mobile communication technology.Based on 5G supporting for low-latency,high-reliability,and large-capacity communications,higher capacity(more than 100 times the 5G network),higher data rate(TB level per second),wider seamless coverage,Ultra-low latency and higher reliability was required in B5G.Undoubtedly,the delay and packet loss rate are the most basic network performance indicators in the 5G/B5G system.At the same time,5G/B5G networks are also committed to green energy conservation.While providing QoS guarantee to improve network performance,the energy efficiency of the system is also an important factor.To this end,this thesis will conduct the following research:1)With respect to the end-to-end communication system captain problem under multi-root conditions,an end-to-end wireless system model is proposed based on the effective bandwidth and effective capacity model.It is assumed that the arriving data packet length obeys a variety of more complex distributions,and the Newton iteration method is used to accurately find multi-root,the edge probability matrix method is proposed to solve the probability distribution function of end-to-end captain.The simulation results verified the accuracy of the end-to-end queueing distribution obtained by this method.2)With respect to the delay and cross-layer energy efficiency problems of end-to-end wireless communication systems,a solution to delay distribution and an energy-efficiency power control scheme are proposed.Based on the end-to-end wireless system model,assuming that the arriving data packet length obeys the sub-exponential distribution,a matrix geometry method is proposed to solve the coefficient problem effectively,and the probability distribution function of the end-to-end delay is accurately estimated;In addition,the end-to-end model is modeled as a double based on the energy efficiency analysis model under the analog circuit,the power allocation scheme of energy efficiency optimization under the time delay constraint is proposed.The analysis results and simulation results verify the accuracy of the end-to-end delay distribution obtained by this method.3)With respect to the problem of energy efficiency considering time delay constraints,a power control scheme applied in Vehicle-to-Vehicle(V2V)scenarios is proposed.Based on a V2V system model considering interference,the scenario where V2V communication is modeled under a dual-mode circuit makes the optimization of system efficiency more accurate;the energy efficiency optimization problem is transformed into a quasi-convex optimization problem,and a dichotomy is proposed.Algorithm to achieve power control and optimize energy efficiency.The simulation results verify the accuracy of the method.To sum up,the thesis is mainly based on the problem of the team length and delay distribution in the end-to-end wireless communication system,and accurately estimates the probability distribution function of the end-to-end team length and the delay in the wireless communication system under the condition of multiple roots.Based on these studies,a cross-layer energy efficiency power control scheme is proposed,and finally the scheme is applied to V2V scenarios and solutions are given.