Path Optimization Scheme For Concurrent Multipath Transfer In Heterogeneous Networks

Concurrent multipath transmission(CMT)technology in heterogeneous networks that can simultaneously transmit using different network bandwidths and can solve the problem of network load balancing is more and more widely studied.However,the path characteristics in heterogeneous network coverage scenarios dynamically change and vary greatly.Therefore,in order to achieve reliable and efficient data transmission,this paper mainly studies the path optimization schemes in CMT.First of all,based on the analysis of the key issues and solutions to the problems of heterogeneous networks and concurrent multipath transmission technologies,a new path optimization scheme is designed to the goal of restraining the degree of disorder.This scheme mainly studies how to select a number of optimal paths from the standby path to meet the requirements of the scheme to carry out data transmission.Therefore,a geometric path evaluation model based on path delay,bandwidth and packet loss rate is first established.Second,In oder to select a set of active paths with large bandwidth,small packet loss rate and small delay-difference from the geometric path evaluation model,we combine the dichotomy with the improved density-based clustering analysis method.Compared with the AHP weighted algorithm,the establishment of this geometric path evaluation model considers the influence of each path parameter on the path quality separately,which makes the selection of the optimal path more accurate.And the clustering analysis method is applied to the path optimization scheme firstly,and the density calculation range of the traditional clustering analysis method is reduced from all data points to a set of partial data points,reducing the computational complexity.Then,because the disorderly sequence of the receiver can not be completely avoided,a certain degree of disorder is bound to cause the increase of network energy consumption,and concurrent multipath transmission also consumes more energy than single-path transmission.Therefore,a new path optimization scheme is proposed which can reduce the degree of disorder and reduce the network energy consumption.The path performance quantificationvalue and total energy consumption of each backup path are calculated respectively according to the standardized processing values of the path delay,bandwidth and packet loss rate parameter values and the energy consumption model,and the path evaluation model based on the path performance quantified value and the total energy consumption is established under two-dimensional polar coordinates,According to the required number of paths,a dichotomy method is used to search for a set of paths with low degree of disorder and low energy consumption in the path evaluation model as active paths.Compared with the scheme of path optimization using the CMT-PQEM model,the establishment of this path evaluation model not only considers the influence of path performance on path optimization but also gives the relation between network energy consumption and path optimization,and the first time a two-dimensional polar coordinate system is applied to the path search,the search process more simple and direct,and the active paths searched out have better transmission performance.