Research On The Model Of End-to-End Delay In Mobile Networks

More and more real-time services have emerged in modern networks,such as online games,voice over IP and video on demand business,and the development of these services has made a higher delay requirement for the future networks.Mobile Internet is the most potential extension direction of traditional Internet,and its delay analysis is of great significance such as end-to-end delay analysis model can provide theoretical guidance for the deployment of new services.Statistical network calculus theory is applied to multi-node delay modeling,which overcomes the difficulties of traditional network performance analysis method in multi-node delay analysis and solves the problem of low resource utilization in deterministic network calculus theory.However,there are still some challenges of the multi-node delay analysis by using statistical network calculus theory.For instance,it is hard to construct a statistical traffic envelope suitable for a variety of traffic processes;the derivation of statistical network service curve is difficult;and the network performance boundary is of poor scalability and other issues.Aiming at the problems in the network performance analysis of multi-node in statistical network calculus,and the goal of establishing end-to-end delay model of mobile Internet,this paper has done the following work:1.An improved statistical traffic envelope and statistical service curve are proposed to construct a strong analytical network performance analysis framework.And this thesis derives the performance bounds of this framework,which provides the theoretical analysis basis for the end-to-end delay analysis of mobile Internet.2.The wired network and the wireless access network are considered separately.The multi-node analysis framework in the statistical network calculus theory is used to derive the expression of the delay bounds by setting the appropriate arrival and service processes in the cable network.The delay of the wireless access network is described by using the GE model to establish its wireless channel model and compute its channel capacity.The wireless delay bound is solved by the statistical network calculus theory in the form of moments generating function.By using the input and output characteristics of the series pre-feedback network,the two delay parts are combined to form the whole end-to-end delay analysis model.3.This thesis adopt the numerical examples to verify the effectiveness of the model,and the results show that the method proposed in this paper can obtain a more compact delay bounds compared with the method of adding per-node bounds and have better scalability.The results of this paper can be used to analyze the actual performance of network services,and provide a theoretical basis for the analysis of whether the deployment of new services can meet the requirements of QoS.