VoLTE Performance in Railway Scenarios

2015 ◽  
Author(s):  
Aleksander Sniady ◽  
Morten Sønderskov ◽  
José Soler
Keyword(s):  
Data Communication ◽  
Emergency Call ◽  
Current Standard ◽  
Railway Network ◽  
Communication Services ◽  
Voice Communication ◽  
Voice Transmission ◽  
Alternative Technologies ◽  
Train Control ◽  
3Gpp Long Term Evolution

GSM-Railways (GSM-R) is the current standard for railway voice and data communication. GSM-R provides railway specific voice services, such as Railway Emergency Call (REC). GSM-R provides also the European Train Control System (ETCS), which offers in-cab signaling and Automatic Train Protection (ATP). Despite these features and services, GSM-R has various major shortcomings. Therefore, alternative technologies are considered to replace GSM-R and become the next generation railway mobile communication network. 3GPP Long Term Evolution (LTE) is a likely candidate for GSM-R replacement. LTE is more efficient, flexible and offers much higher capacity, which allows the railway network to provide new communication-based applications for railways. Most of the research on LTE in railways has been focused on data-based railway applications (ETCS signaling and other). Nevertheless, voice communication is still a crucial service for railways. Regardless of its advantages, LTE can only become a railway communication technology if it provides voice communication fulfilling railway requirements. This paper presents how Voice over LTE (VoLTE) can be used to build railway communication services. Examples of Railway Emergency Call and One-to-One Call are provided. Service performance, in terms of call setup times and voice transmission quality, is analyzed in simulation scenarios modelling two railway scenarios in Denmark.

scholarly journals Impact Analysis of Interference Sources on Data Communication System for CBTC Application

2012 ◽  
Vol 6-7 ◽  
pp. 356-360
Author(s):  
Shao Yin Wang ◽  
Yi Yu ◽  
Guo Xin Zheng ◽  
Qing Feng Ding
Keyword(s):  
Communication System ◽  
Impact Analysis ◽  
Data Communication ◽  
Access Point ◽  
Outdoor Environment ◽  
Test Bed ◽  
Communication Performance ◽  
Train Control ◽  
Data Throughput ◽  
Lab Test

We study the anti-interference performance of the 802.11 system when it works as Data Communication System (DCS) in Communication Based Train Control (CBTC). We first conduct extensive experiments on a 802.11b network to assess the ability on a lab test bed, then the outdoor experiments are also conducted. In the presence of jammer, we find that in each case of interference model, there exists a C/I threshold which determine the DCS-Access Point (DCS-AP) and DCS-Station Adapter (DCS-STA) communication performance. In the outdoor environment, different interference sources are adopted to investigate the data throughput value and other parameters of the DCS system under the critical state.

Survey and Examination of Various CBTC Data Communications Subsystems

2013 ◽  
Author(s):  
Michael Fitzmaurice
Keyword(s):  
North America ◽  
Best Practice ◽  
Data Communication ◽  
Data Communications ◽  
Innovative Design ◽  
Train Control ◽  
Communication Subsystems

This paper will survey and describe the various data communication subsystems (DCSs) used on many communications based train control (CBTC) system projects planned and in service throughout North America, Europe and Asia. The paper will focus on the RF characteristics of the DCS so as to highlight the similarities and common challenges that all DCSs face with a view to presenting best practice and innovative design.

Dependability analysis of the data communication system in train control system

2009 ◽  
Vol 52 (9) ◽  
pp. 2605-2618 ◽  
Author(s):  
TianHua Xu ◽  
Tao Tang ◽  
ChunHai Gao ◽  
BaiGen Cai
Keyword(s):  
Control System ◽  
Communication System ◽  
Data Communication ◽  
Train Control ◽  
Train Control System ◽  
Dependability Analysis

A Control System in Satellite Navigation and Communication Terminal

2014 ◽  
Vol 513-517 ◽  
pp. 2888-2892
Author(s):  
Zheng Qun Hu ◽  
Guo Xiang Ai ◽  
Li Rong Zhang ◽  
Chao Hu
Keyword(s):  
Control System ◽  
Communication System ◽  
Satellite Communication ◽  
Data Communication ◽  
Satellite Navigation ◽  
Quality Data ◽  
Communication Interface ◽  
Voice Communication ◽  
Good Communication ◽  
Set Up

For the needs of a satellite navigation and communication system, we design and implement a terminal control system in the integration of navigation and communication system in this paper. The control system consists of CPU controller, GPS positioning module, smart finding and alignment satellite module, transmit/receive baseband, RF module, voice module and other functional modules, which has navigation and communication function. Satellite communication includes voice communication and data communication. The voice communication interface is operated conveniently, which using I/Q quadrature BPSK modulation to set up satellite links easily. It has a good communication quality. Data communication using the bidirectional answer mode to make success rate close to 100% in data upward to the communication center station, which is well to meet the needs in data upward.

scholarly journals Railway Wireless Communications Channel Characterization

2021 ◽  
Vol 12 (1) ◽  
pp. 345
Author(s):  
Nerea Fernández-Berrueta ◽  
Jon Goya ◽  
Jaione Arrizabalaga ◽  
Iker Moya ◽  
Jaizki Mendizabal
Keyword(s):  
Communication Technology ◽  
Mobile Networks ◽  
Mobile Communications ◽  
Communication Channel ◽  
Communication Technologies ◽  
Railway Network ◽  
The Public ◽  
Train Control ◽  
The Cost

Railway applications are in continuous evolution with the aim of offering a more efficient, sustainable, and safer transportation system for the users. Generally, these applications are constantly exchanging information between the systems onboard the train and the trackside through a wireless communication. Nowadays, Global System for Mobile communications-Railway (GSM-R) is the technology used by European Train Control System (ETCS), but it is becoming obsolete. Therefore, alternatives for this technology have to be found for the different railway applications. Its natural evolution is to move forward with the latest technology deployed: Long-Term Evolution (LTE), which the Public Land Mobile Networks (PLMN) have already deployed. Therefore, testing the performance of this communication technology in the railway environment could be useful to assess its suitability and reduce the cost of railway network dedicated deployment. In order to do that, a methodology to characterize the communication environment is proposed. The main goal is to measure geolocated impairments of any communication channel in a railway environment being able to determine its behavior of the different communication technologies and find out possible coverage issues. Moreover, it could help in the selection of suitable communication technology for railway. This paper presents a brief description of the communication for railways and its QoS parameters for performance measuring. Afterward, the testing methodology is described, and then, the communication channel measurement campaign on a real track in Spain where the railway environment is variable is presented (tunnels, rural/urban area…). Finally, the measurements and results on this real track in Spain are shown. The results provide suitability of the 4G technologies based on the delay requirements for the implementation of ETCS over it.

scholarly journals 5G Vehicular Network for Smart Vehicles in Smart City: A Review

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Hamzah U. Mustakim
Keyword(s):  
Smart City ◽  
Intelligent Transportation System ◽  
Data Communication ◽  
Intelligent Transportation ◽  
Vehicular Network ◽  
Transportation System ◽  
Maximum Speed ◽  
Multimedia Services ◽  
Communication Services ◽  
Smart Vehicles

Smart vehicles is one of the innovation that can be used to increase the effectiveness of traffic in smart city as urban area and in the highway. In its development, smart vehicles not only require mobile communication services to ensure safety but also multimedia services for the passengers. These services must be integrated on intelligent transportation system. 5G vehicular network technology provides data communication services for intelligent transportation system via macrocells and smallcells to support smart vehicles which can drive at a maximum speed of 500Km/hour with multimedia services for passengers with data rates reaching the Gbps level. This paper will review 5G network architecture and emerging technologies that enabling vehicular network for smart vehicles in smart city.

scholarly journals LTE-U based Train to Train Communication System in CBTC: System Desin and Reliability Analysis

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Hao Liang ◽  
Hongli Zhao ◽  
Shuo Wang ◽  
Yong Zhang
Keyword(s):  
Control System ◽  
Communication System ◽  
Evaluation Method ◽  
Operating Cost ◽  
Data Communication ◽  
Stochastic Petri Nets ◽  
Critical Signal ◽  
Efficient Operation ◽  
Train Control ◽  
Train Control System

Communication-Based Train Control (CBTC) system is a critical signal system to ensure rail transit’s safe operation. Compared with the train-ground CBTC system, the train control system based on train-to-train (T2T) communication has the advantages of fast response speed, simple structure, and low operating cost. As the core part of the train control system based on T2T communication, the reliability of the data communication system (DCS) is of great significance to ensure the train’s safe and efficient operation. According to the T2T communication system requirements, this paper adopts Long-Term Evolution-Unlicensed (LTE-U) technology to design the DCS structure and establishes the reliability model of the communication system based on Deterministic and Stochastic Petri Nets (DSPN). Based on testing the real line’s communication performance parameters, the DSPN model is simulated and solved by π -tool, and the reliability index of the system is obtained. The research results show that the LTE-U-based T2T communication system designed in this paper meets the train control system’s needs for communication transmission. This paper’s reliability evaluation method can complete the reliability modeling of train control DCS based on T2T communication. The research in this paper will provide a strong practical and theoretical basis for the design and optimization of train control DCS based on T2T communication.

Voice Over Internet Protocol

2008 ◽  
pp. 663-669 ◽  
Author(s):  
Indranil Bose ◽  
Fong Man Chun
Keyword(s):  
Internet Protocol ◽  
Data Networks ◽  
The Internet ◽  
Voice Over Internet Protocol ◽  
Voice Communication ◽  
Voice Transmission ◽  
Voice Signal ◽  
Public Networks ◽  
Unified Messaging

One of the hottest technologies these days is voice communication over packet-switched data networks. This is known as voice over Internet protocol (VoIP). Hardy (2003) defines VoIP as “the interactive voice exchange capability carried over packet switched transport employing the Internet protocol.” With VoIP, voice signal from the sender is digitized into packets that are transmitted to the receiver through a network,which often includes the Internet. As the Internet is a free resource, the communication cost of VoIP is much lower than that of traditional telephone systems. This is a major advantage of VoIP. VoIP system also increases the efficiency and service quality of businesses. As a result of VoIP, many advanced applications can be built and these include unified messaging, video conferencing, and ring list. But VoIP is not without its limitations. Its main drawback is low reliability. It also suffers from uncertain quality of voice transmission. In addition, it cannot guarantee security because it uses public networks. Although the idea of VoIP was known from the 1970s, it did not become commercially viable until 1995, when Vocaltec became the first company to produce the first commercially available VoIP product (Varshney et al., 2002).

Sign in / Sign up

Export Citation Format

Share Document