• Journal of the Institute of Electronics Engineers of Korea TC
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• v.42 no.11
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• pp.21-26
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• 2005

We propose a fully converged Ethernet and TDM transport system. Developed Ethernet and TDM convergence system can support not only L2 VPN service and premium multimedia service based on MPLS protocol but also TDM leased line service, simultaneously. Developed convergence system can provide high reliability for Ethernet packet due to support protection and restoration function of circuit based networks. Evaluation for Ethernet and TDM path was successfully performed to show the typical application of the proposed system in the legacy networks.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37B no.9
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• pp.822-830
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• 2012

The most representative research network in Korea, KREONET has developed the NSI based NSA (Network Service Agent) technology. The developed NSA supports web service and provides services for reservation, provision, release and termination of network resource, whenever users want to utilize them. In this paper, the system blocks of the developed NSA and flows of NSI interface massage are presented firstly, Also, service test results for NSI connection reservation is given through internet communication of the web portal system to operate as the RA NSA and the NSA, Finally, it is confirmed that reservation, provision, release and termination of network resource can be established through NSI messages based on reservation information from user, between the web portal and the NSA.

• Journal of the Korea Society of Computer and Information
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• v.13 no.5
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• pp.95-102
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• 2008

The next generation network preparation of stock computer network designated to facilities and goal facilities-based national main information communication certainly necessary for 'national competitiveness enhancement and national economic strength elevations'. This paper studies current government policy and network, security and securities computer network, and substitute for securities computer network-based the existing SONET/SDH, and next generation securities computer network designs so as to provide ALL-IP service-based MPLS for international GMG service. Set up stability, standardization, security, a basis of and compare is current next generation securities computer network by each bases in case of designs. Analyze an expected effect to have been improved at next generation stock computer network characteristics and merits and substitution width and QoS, communication instrument liquor, an information protection system etc. too. Result of research of this paper will contribute to national competitiveness enhancement and a national economic strength elevation to accomplish u-Korea.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.12 no.6
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• pp.297-302
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• 2012

RAN in mobile backhaul network connects base station to mobile backhaul network. This the interfaces for several generations mobile communication technologies, such as TDM, ATM, and Ethernet in cell site, and then Ethernet in mobile backhaul site. In near future, the mobile communication network will be changed to all IP/Ethernet one, and then ultimately Ethernet and TDM traffics will be transferred through IP network. So these technologies have to be encapsulated for transferring to the mobile backhaul network. The performances are measured for each encapsulation, such as ATM, MPLS, IP/UDP, and MEF8.

• The Journal of Information Technology
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• v.4 no.3
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• pp.87-100
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• 2001

IETF has proposed integrated services model(Int-Serv) and differentiated service(Diff-Serv) to supply IP QoS in Internet[1][2]. Int-Serv model uses state information of each IP flow, so satisfies QoS according to traffic characteristics, but increases the amount of flow state information with increasing flow number. Diff-Serv uses PHP(Per Hop Behaviour) and there are well-defined classes to provide differentiated traffics with different services according to delay and loss sensitivity. Diff-Serv model can provide diverse services in Internet because of having no the state and signal information of each flow. As MPLS uses the packet forwarding technology based on label, it implements the forwarding engine of high performance easily. The MPLS can set up the path having different and variable bandwidth and assign each path to particular CoS (Class of Service). Therefore it is possible to support the Diff-Serv model of well- defined classes that can provide the differentiated traffic with different services according to delay and loss sensitivity in IP QoS models of IETF. In this paper we propose a scheme that can accommodate Diff-Serv model to provide QoS. The system performance has been estimated by scheduling plan according to traffic classes.

• The Magazine of the IEIE
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• v.30 no.2
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• pp.50-50
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• 2003

광교환 및 광라우팅 기술은 광인터넷에 접속되는 이용자가 원하는 인터넷 서비스를 실시간으로 제공받을 수 있도록 대상 목적지를 찾아 최단 시간내에 접속시켜 주기 위해 광인터넷 제어평면을 이용한다 GMPLS기반 광인터넷 제어평면은 노드간 신호 유형 및 신호속도, 그리고 전송 프레임 구조 등과 무관한 호/연결 접속 능력을 제공하기 위해 기존의 계층 2.5 스위칭 구조인 MPLS개념에 계층 1스위칭 구조로까지 확장된 개념이다. 이 확장된 개념을 기능 구조화하고 시스템화하기 위해서는 표준화 상황 및 기술개발 동향을 분석하고, 노드간 상호연동성을 보장할 수 있는 현실적인 시나리오와 기능 구조를 우선 결정해야한다. 본 논문에서는 시스템 엔지니어링 관점에서 광인터넷 제어평면의 개념 단계에서부터 시스템 단계에 이르기까지 표준화 상황, 제어평면 기능, 그리고 시스템 적용 등을 단계적으로 기술함으로서, 제어평면 관련 광인터넷 시스템에 좀더 가까이 다가서고자 한다.

• The Magazine of the IEIE
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• v.30 no.2
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• pp.160-168
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• 2003

광교환 및 광라우팅 기술은 광인터넷에 접속되는 이용자가 원하는 인터넷 서비스를 실시간으로 제공받을 수 있도록 대상 목적지를 찾아 최단 시간내에 접속시켜 주기 위해 광인터넷 제어평면을 이용한다 GMPLS기반 광인터넷 제어평면은 노드간 신호 유형 및 신호속도, 그리고 전송 프레임 구조 등과 무관한 호/연결 접속 능력을 제공하기 위해 기존의 계층 2.5 스위칭 구조인 MPLS개념에 계층 1스위칭 구조로까지 확장된 개념이다. 이 확장된 개념을 기능 구조화하고 시스템화하기 위해서는 표준화 상황 및 기술개발 동향을 분석하고, 노드간 상호연동성을 보장할 수 있는 현실적인 시나리오와 기능 구조를 우선 결정해야한다. 본 논문에서는 시스템 엔지니어링 관점에서 광인터넷 제어평면의 개념 단계에서부터 시스템 단계에 이르기까지 표준화 상황, 제어평면 기능, 그리고 시스템 적용 등을 단계적으로 기술함으로서, 제어평면 관련 광인터넷 시스템에 좀더 가까이 다가서고자 한다.

• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.2413-2417
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• 2003

This paper proposes an improvement of a QoS based routing protocol. The hierarchical source routing algorithm[4] was improved by including of the Crank-Back algorithm[2]. The Crank-Back capability is the ability to solve the problem of selecting the wrong route because of using unsynchronized routing information in the ingress router. In order to reduce time of reversing the call-setup process back to the ingress router, spare-route information is included with a call-setup packet. Spare-route information could be used by every router to find the next appropriated link itself when insufficient resource of the selected link was found. The proposed algorithm improves the performance of the source routing call-setup process significantly.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2002.06a
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• pp.89-96
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• 2002

In this paper, we present the functional architecture for the traffic engineering capable policy based network management system. In this paper, we also examine the traditional approach to network management, contrast it with the policy based approach. The architecture includes the traffic engineering facilities, especially MPLS traffic engineering functions, to provide maximum network resource utilization. The policy server should communicate with the traffic engineering server and network manager to enforce the network policy efficiently. The interfaces and interworking methods are described in this paper.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.5A
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• pp.889-901
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• 2001

본 논문에서 Multiprotocol Label Switching 시스템을 위한 Label Distribution Protocol의 개발과 분석에 관해서 기술한다. 먼저 Gigabit Switched Router를 만들기 위해서, 상용화시 Carrier Class 제품에 적용하기 위한 LDP의 구현시 고려해야 될 사항에 대해 살피고, 상세 설계를 제안한다. IETF 표준에 의거한 LDP의 구현을 위한 상세 설계는 프로토콜 상태기계의 유도 트리와 프로세스 대수를 사용한 형식적 명세를 사용하여 제시한다. 본 논문에서는 제시된 유도트리와 프로세스 대수를 사용한 프로토콜 동작의 분석을 통해, 구현된 LDP의 상호 연동성과 완전성, 생존성, 도달성, 안전성을 검증한다. 또한 이를 사용하여 구현된 LDP가 기존 상용 제품들과의 연동성과 그 동작의 신뢰성을 확보할 것을 기대한다. 결과적으로 구현된 LDP의 프로토콜 동작들의 검증을 제공한다.