• Journal of the Korean Society for Railway
• /
• v.16 no.6
• /
• pp.519-527
• /
• 2013

Mobile radio technologies have evolved in the railway industry offering seamless connectivity and various functionalities to improve railway service. Recently, advanced mobile communication technologies have enabled a new level of railway customer services with more efficient railway operation. Since the LTE mobile communication technology offers many benefits and better performance for new railway services, it is considered to be a strong candidate for the future railway mobile telecommunication. However, communication networks in the railway sector are critical for secure operation and have stringent requirements for reliability and safety. In this paper, we explain the requirements for the future railway mobile telecommunication. The LTE, which would be the future railway mobile technology, is analyzed against these requirements. We also introduce the current state of standardization for the future railway mobile telecommunication and its implementation plan.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.12 no.4
• /
• pp.555-560
• /
• 2017

Currently, railway wireless communication systems adopt several communication schemes depending on the specific region. To increase data rate and achieve high fidelity in railway wireless communication systems, LTE-R scheme has been developed. In this paper, We introduce interoperability technology which converges several railway communication systems including LTE-R. First, we consider two interoperability methods and their standardization. Some empirical test results of interoperability technology are also introduced. It is expected to provide seamless and statable railway communication environments by applying interoperability technologies to railway wireless communication systems.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.11 no.4
• /
• pp.379-386
• /
• 2016

As well as to operate a high-speed rail, our country with capability to produce high-speed train has developed a number of techniques, such as for a riding comfort improvement, automatic diagnosis for major electrical or mechanical parts, on board measurement for catenary systems and noise reduction of running rolling-stocks are still under development. In this paper, we describe the current status of operation technologies not only traditional railway wireless communication systems but also Long Term Evolution systems which would be deployed as soon as possible, like as in Europe, China and the United States. In addition, we produced the domestic wireless communication networks for railway which KORAIL Corp. has been operating and the schemes and the plans of HSR field test for the fourth generation mobile communication which should be enforced by national research and development.

• Information and Communications Magazine
• /
• v.32 no.12
• /
• pp.3-9
• /
• 2015

무선통신에 대한 기술이 급격하게 진화함에 따라, 철도 무선통신도 VHF나 TETRA에서 GSM으로 진보되었고, 현재는 LTE 기반으로 변화하고 있다. 이런 흐름 속에서, 본 고에서는, LTE 로 발전 되는 철도 무선망을 QoS(Quality Of Service) 관리 및 이동통신망 과는 다른 관점에서 철도통신(LTE-Railway)에서 추가되어야 할 요구사항 및 거기에 다른 요소 기술들을 살펴본다. LTE-R 시스템에서는 음성, 영상, 열차제어 등 모든 종류의 진보된 철도 서비스에 대해서 통합된 형태로 안정적이고 신뢰성 있은 서비스를 제공하는 것을 목적으로 한다. 이런 요구사항을 만족시키기 위해서는 일반 이동통신망과는 다른 접근으로 LTE-R을 개발할 필요가 있다. 본 고에서는 LTE 기반 철도통신망과 이동통신망의 다른 요구사항을 기반으로 과 차이점을 QoS(Quality Of Service) 등 철도와 같은 특수 임무형 통신 시스템에서의 요구사항이 적절하고 실용적인지 여부의 검증을 LTE 테스트베드를 실제 철도 영업선 상에 구축을 하고 필드 테스트를 통해서 만족 여부를 검토하였다. 국가적으로 진행되고 있는 LTE 기반 철도 통신망 구축 사업에서 요구하는 통신 기술 사이의 상관관계를 따져봄으로써 LTE-R에서 지원하는 통신 기술이 신뢰도 및 효율성 측면에서 충분한 정도의 기술적인 완성도를 갖추고 있음을 보인다.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.12 no.5
• /
• pp.755-762
• /
• 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.

• Journal of Satellite, Information and Communications
• /
• v.7 no.3
• /
• pp.75-77
• /
• 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.

• Proceedings of the KIEE Conference
• /
• 2005.07b
• /
• pp.1576-1578
• /
• 2005

기존 국내의 간선 철도와 도시철도에서는 궤도회로에 기반한 고정폐색방식에 의한 열차제어시스템을 사용하고 있으나, 세계적인 추세가 유지보수 비용을 줄이고 선로 용량을 증가시킬 수 있는 무선통신을 이용한 이동폐색방식에 의한 새로운 통신기반 열차 제어 시스템(CBTC(Communication Based Train Control) system)에 대한 연구가 활발히 진행되고 있으며, 특히 도시철도의 경우 이에 대한 실용화가 이루어지고 있는 실정이다. 현재 국내에서도 한국철도공사에서는 분당선 구간에 CBTC 시스템의 시범적응을 진행하고 있으며, 또한 한국철도기술연구원에서도 건설교통부가 추진하고 있는 도시철도 표준화 사업의 한 분야로 도시철도 신호시스템에 대한 향후의 표준화 방향을 CBTC 시스템으로 선정하고, 이에 대한 표준화 및 국산화 연구개발이 진행되고 있다. 또한 유럽에서 진행되고 있는 ERTMS/ETCS 시스템의 레벨 2와 3에서는 앞의 방식하고는 다른 GSM-R의 무선방식을 사용하고 있지만 이 또한 무선통신에 의한 열차제어시스템을 적용하고 있다. 본 연구에서는 이러한 무선통신을 이용한 열차제어시스템에 있어서의 안전제동모델에 대해 연구하였으며 그 결과를 소개하고자 한다.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.10 no.6
• /
• pp.659-664
• /
• 2015

The current railway wireless network uses various communication scheme depending on the section of railway. Therefore, in the train, it is required a specific communication device for the corresponding communication scheme to communicate and exchange data with the control center. To enhance data rate and support various services, LTE-R scheme has been developed for the next generation railway communications. To use both the existing communication and LTE-R schemes, it is required an integration method for encompassing all communication schemes. In this paper, we overview existing railway communications and LTE-R scheme. Then, we develop a network integration method which can be applied by using one terminal in the train. In addition, implementation issues for the integration are also considered.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.11 no.8
• /
• pp.729-734
• /
• 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.

• Information and Communications Magazine
• /
• v.32 no.12
• /
• pp.10-16
• /
• 2015

본 고에서는 최근 큰 관심을 받고 활발하게 연구 개발이 이뤄지고 있는 네트워크 기능 가상화(NFV; Network Functions Virtualization) 기술을 LTE(Long Term Evolution) 기반 철도 무선망에 적용할 것을 제안하고, 신뢰성, 가용성, 확장성을 중심으로 기대효과를 분석한다. LTE 기반 철도 무선망 관련 국내표준과 부산도시철도 1호선 구축 사례를 바탕으로 LTE 기반 철도 무선망의 요구사항을 소개하고, Cloud-RAN과 네트워크 이중화 사례를 통해 NFV 기술 도입에 따른 기대효과를 분석한다.