• Title, Summary, Keyword: Wireless railway communication system

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Application of Cooperative Transmission Scheme in Railway Wireless Communication System (철도 무선통신내에서 협력전송기법의 응용)

  • Park, Jae Jung;Kim, Yoon Hyun;Kim, Jin Young;Yang, Jae Soo
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.12 no.6
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    • pp.251-255
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    • 2012
  • In recent years, according to improvement of various vehicle instruments, railway also has been developed in various fields. As a result, to transmit accurate information to each railway system, the efficient communication system is required. In railway communication system, mitigation of wireless fading is very important. So, in this paper we introduced the cooperative relay channel model and cooperative relay scheme. Also we analyzed and simulated the cooperative relay scheme which is suitable for railway communication systems.

Cooperative Transmission Scheme for Railway Wireless Communication System (철도 무선통신 시스템에서의 협력 전송기법)

  • Park, Jae Jung;Kim, Yoon Hyun;Kim, Jin Young;Yang, Jae Soo
    • Journal of Satellite, Information and Communications
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    • v.7 no.3
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    • pp.75-77
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    • 2012
  • In recent years, with the development of various transportation, railway evolved a lot. With advanced rail system, efficient communication system was required. for the delivery of accurate information of railway communications systems. Accordingly, railway communication system has evolved in a variety of ways. Cooperative communication method was proposed railway minimize the effects of fading in wireless communications and more efficient communication. In this paper, we present cooperative transmission techniques and channel characteristics and examples, and simulation results.

Development of Integrated Wireless Network for Railway (철도전용 통합무선망 개발)

  • Song, Yongsoo;Kim, Yong-Kyu;Baek, Jong-Hyen
    • Journal of the Korean Society for Railway
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    • v.16 no.6
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    • pp.551-557
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    • 2013
  • This research aims to conduct a study on the feasibility of the LTE communication method for developing a dedicated integrated railway wireless network. An empirical analysis was carried out by establishing a dedicated integrated railway wireless network in an approximately 12km section between Illo station and Daebul station on the Honam line. Korean wireless communication methods for railway safety are different depending on each line, which makes it difficult for railway workers to cooperate with. This causes various problems. There is the ever-present risk of accidents due to call disconnection between wireless communication systems, frequency interference from commercial networks, and crosstalk. This study verified the feasibility of the 4th generation communication system, LTE, over the dedicated integrated railway wireless network as a solution for the above mentioned problems. The result shows this communication system exceeded existing performance standards of Europe GSM-R in every test item despite the location constraint of train tracks on the base station establishment.

Study on optimized positioning of wireless communication equipment for CBTC (CBTC를 위한 무선통신장비의 최적 위치 선정연구)

  • Kim Yun-Bae;Jung Jae-Ok
    • Proceedings of the KSR Conference
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    • pp.1199-1204
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    • 2004
  • In this paper, the DCS (Data Communication System) which is a main part of CBTC (Communication Based Train Control) system is consisted of radio based wireless communication system and optical based wired system. In the radio based wireless communication, the location of AP(Access Point) Enclosure and Antenna shall be optimized for the guaranteed communication channel between wayside and trains either open aired or tunnelled area. This study is introducing the way of determinating optimized positioning the radio based wireless communication equipment in Bundang Line. At this moment, this CBTC project for the KNR's (Korea National Railway) intelligent train control system are in installment phase therefore the simulation data can show only from lab equipment. After the phase I testing, more detailed data can be collected and advanced paper will be issued in a short time.

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Performance Measurement of LTE based Railway Wireless Communication Systems in the Testbed (테스트베드상에서 LTE기반 철도 무선통신시스템의 성능 측정)

  • Kim, Bum-Gon;Kwon, Byung-Hee;Cho, Han-Byeog;Cho, Woong
    • The Journal of the Korea institute of electronic communication sciences
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    • v.12 no.5
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    • pp.755-762
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    • 2017
  • In railway communication, LTE based railway wireless communication systems have been developed to support high data rate and reliable communication link. In this paper, the testbed of LTE based railway wireless communication systems is introduced. Then, we describe measurement results of communication performance such as radiation strength, communication coverage, call setup time, handover success rate, and data transmission rate in the testbed. We also consider requirements for commercialization based on measurement results.

Comparison Study of Interoperability of Railway Wireless Communication Networks (철도 무선통신망 연동방안 비교)

  • Cho, Woong
    • The Journal of the Korea institute of electronic communication sciences
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    • v.11 no.8
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    • pp.729-734
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    • 2016
  • The current domestic railway wireless communication networks transmit and receive data using several communication schemes such as VHF, TRS-ASTRO, and TRS-TETRA depending on the specific region. Recently, LTE scheme has been adopting in railway wireless communication systems to provide various services and increase reliability. It is critical to support the network interoperability between the existing communication schemes and new communication scheme for seamless data transmission. In this paper, we propose two interoperability schemes in railway communications networks, i.e., network oriented scheme and terminal oriented scheme. We consider the operation scenario for each scheme and compare two interoperability schemes. The practical implementation issues are also discussed based on suggested schemes.

Performance Verification of WAVE Communication Technology for Railway Application (차량용 무선통신기술(WAVE)의 철도 적용을 위한 성능검증)

  • Kim, Keum-Bee;Ryu, Sang-Hwan;Choi, Kyu-Hyoung
    • Journal of the Korean Society for Railway
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    • v.19 no.4
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    • pp.456-467
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    • 2016
  • Wireless Access in Vehicular Environments (WAVE) communication technology, which provides vehicleto-vehicle and vehicle-to-infrastructure communication and offers safe and convenient service, has been developed for application to an Intelligent Transport System (ITS). This paper provides field test results on a study of the feasibility of WAVE technology application to railway communication systems. A test railway communication system based on WAVE technology has been built along the Daebul line and a newly developed EMU. Field tests have been carried out according to the communication function requirements for LTE - R. The test results show that the railway communication system based on WAVE technology meets the functional requirements: maximum transmission length is 730m, maximum transfer delay is 5.69ms, and maximum interruption time is 1.36s; other tests including throughput test, video data transmission test, VoIP data test, and channel switching test also produced results that meets the functional requirements. These results suggest that WAVE technology can be applied to the railway communication system, enabling Vehicle-to-Wayside communication.

Optimization of LTE-R Network using 2.6GHz Test Frequency in Daebul Test Line (2.6GHz 시험주파수를 이용한 대불선 시험선에서의 LTE-R 망 최적화)

  • KWAK, Woo-Hyun;KIM, Yong-Kyu
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.9
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    • pp.1398-1405
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    • 2015
  • Domestic railway communication in Korea has been introduced for mutual communications among control center, operation staffs, and maintenance staffs. It has been mainly used as railway disaster and safety functions from VHF and UHF from 1980’s and TRS-Astro and TRS-Tetra from the 2000’s. Recently for urban railways communications, 18GHz and 2.4GHz ranges have been utilized for image transmissions and control command communications, respectively. This paper analyzes technical development of LTE-R, LTE communication for Railways, that has been designed as a single integrated railway wireless network in order to merge the current various communication systems. In this paper, we present the details of the examination of the LTE-R test-bed using 2.6GHz test frequency in Daebul test line through CW test and optimization test.

A study of network mobility for internet service in railway system (철도에서 네트워크 이동성 적용 방안)

  • Cho, B.K.
    • Proceedings of the KIEE Conference
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    • pp.255-257
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    • 2004
  • The study for ubiquitous computing infra is proceeding actively, it make possible to use service and access network anywhere, anytime because of wire/wireless communication technology and progress of hardware. Domestically, study for the network mobility support technology which is the key technology for future ubiquitous computing realization have progressed, but that is insufficient. Especially, there is no study for independent mobility support study about railway wireless network. So, this study propose network mobility management technology for mobile network infra in railway and proper network model in train.

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Bandwidth Requirement Estimation Method for Future Wireless Railway Communication Systems (차세대 철도통합무선망을 위한 주파수 소요량 계산방법)

  • Jeong, Minwoo;Yoon, Hyungoo;Park, Duk-Kyu;Kim, Kyung-Hee;Lee, Sukjin
    • Journal of the Korean Society for Railway
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    • v.16 no.6
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    • pp.540-550
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    • 2013
  • The Future Wireless Railway Communication System(FWRCS) has attracted attention for the various advantages of such a system like efficient management, precise periodicity of operation and speedy travel. Related to it, the area of bandwidth requirement estimation for the FWRCS is being researched actively because there is a great need for accurate bandwidth distribution. In this paper, sophisticated bandwidth requirement estimation method for FWRCS is proposed by modifying ITU-R M.1390. With this method, the expected frequency requirements for the present, for five years from now, and for 10 years from now can be calculated by applying the data gathered from the actual field.