Fuzzy and Utility Based Network Selection for Heterogeneous Networks in High-Speed Railway

Abstract

Due to the complexity and fluctuation of the wireless network statuses in the high-speed railway scenario, the existing works of the network selection problem in heterogeneous wireless networks face two major challenges, that is, the imprecise statuses and mobility. In this paper, we propose FSNS, a novel dynamic imprecise-aware network selection approach to solve the problems. The imprecise statuses are inferred by fuzzy rules and the status-awareness feature of the status monitor module enables a dynamic network selection. Through the status monitor and fuzzy processing modules, FSNS is formulated as utility functions for meeting quality-of-service (QoS) requirements. What is more, we carry out plenty of simulation experiments and compare FSNS approach with an enhanced TOPSIS method and fuzzy MADM (FMADM) scheme through simulation experiments of two types of services. The results indicate that FSNS outperforms both TOPSIS and FMADM for a good performance improvement and a preferable decision to keep relative stability and reduce abnormal selections. The conclusion of experimental results has some extent pragmatic value since the network statuses of the simulation are complex and fluctuate by real-world data from high-speed railways.

Network selection algorithm for heterogeneous wireless networks based on service characteristics and user preferences

“…In this experiment, the value of the parameter α, which is used to adjust the ratio between the subjective weight and the objective weight of the network attribute in Formula (12), is set to 0.5, the value of the parameter β, which is used to adjust the ratio between the network score calculated for the network attribute and the user preference value in Formula (18), is also set to 0.5, and the handover threshold parameter ΔThreshold in Formula (19), is set to 0.03.…”

“…In addition, due to user mobility, changes in wireless channel performance, etc., the network attribute values received by the user will change, and each candidate network score also needs to be recalculated, which may cause user handover between different networks. In order to avoid frequent handover between different networks due to slight changes in score, we add handover threshold parameter ΔThreshold, as shown in Formula (19); the handover operation is performed when the difference between the maximum score of the other network and the score of the currently connected network is greater than the handover threshold; otherwise, the existing network connection is maintained, which can further reduce the ping-pong effect.…”

An Efficient Traffic Congestion Monitoring System on Internet of Vehicles

“…. , ) < 0) then (20) Verfication Result == 'Verified' (21) Else Verfication Result == 'Failed' (22) Fuzzy Based Evaluation(r c ) = 'unstable-flow' (23) End while (24) End if The RSU is an embedded platform equipped with two types of communication interface. The first interface is used to directly connect to the VD device.…”

Comprehensive Analysis on Heterogeneous Wireless Network in High‐Speed Scenarios

“…Research on the vehicle-ground communication is a hot topic [13]. Studying the performance of wireless networks under different mobile speeds is an important direction of vehicle-ground communication.…”