Modeling link quality for high-speed railway wireless networks based on hidden Markov chain

Jiayang Song,Ping Dong,Tao Zheng,Huachun Zhou,Wei Quan

doi:10.1186/s13638-016-0759-1

Jiayang Song, Ping Dong + Show 3 more

Open Access

https://doi.org/10.1186/s13638-016-0759-1

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Abstract

In high-speed railway (HSR) wireless networks, the link quality is greatly time-dependent and location-varying. Due to the high randomness, it is challenging to predict the link quality in HSR wireless networks. In this paper, we firstly conducted a certain amount of field measurement campaigns of HSR wireless network link quality. A great number of practical datasets are collected regarding packet loss rate (PLR) and round-trip time (RTT). Then, we analyzed its changing pattern in different time scales, and further model the link quality of HSR wireless network using hidden Markov chain. Based on this, an improved algorithm was developed to simulate the variation of HSR wireless network link quality. Simulation results prove that the proposed model is capable of accurately reproducing the behavior of HSR wireless network link quality with regard to PLR and RTT. This work will offer new inspiration to the prediction of link quality for HSR wireless networks.

Highlights

High-speed railway (HSR) has brought substantial social and economic benefits
6 Conclusions In this paper, we firstly conduct a series of field measurement campaigns for packet loss rate (PLR) and round-trip time (RTT) along realistic high-speed rails and gathered a dataset of more than 120000 entries
A cyclical behavior of HSR wireless network link quality is revealed after the investigation of the measurement results

Summary

Introduction

High-speed railway (HSR) has brought substantial social and economic benefits. Due to its great superiorities, HSRs are widely built and operated around the world, especially in Europe and East Asia. These research cannot characterize the link quality of wireless networks already deployed along the high-speed rails, so they have limited use in helping improve the performance of existing HSR wireless. By evaluating the upper layer performance of deployed wireless networks, the variation of wireless link quality along a realistic HSR line can be revealed In this context, the upper layer is considered as Internet Protocol (IP) layer of protocol stack, whose performance are normally evaluated by parameters of packet loss rate (PLR), round-trip time (RTT). We try to model the link quality for HSR wireless networks with PLR and RTT.

Measurement campaign

Simulation evaluations

Findings

Conclusions