• Proceedings of the Korea Multimedia Society Conference
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• 2003.11a
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• pp.453-456
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• 2003

DWDM(Dense Wavelength Division Multiplexing) 기반의 광 네트워크가 범 세계적인 차세대 광 인터넷(NGOI: Next Generation Optical Internet) 백본망의 대안으로 인식되고 있으나, 기존의 전기적인 오버헤드 비트를 이용한 전송 관리 정보의 사용이 더 이상 유효하지 않아 장애 관리에 많은 문제점을 드러내고 있다. 본 논문에서는 NGOI 백본망의 링크 관리를 위해 광 성능 모니터링 시스템 및. GMPLS(Generalized Multi-Protocol Label Switching)의 링크 관리 프로토콜(LMP: Link Management Protocol)을 활용한 관리 모델을 제시한다.

• 한국정보통신설비학회:학술대회논문집
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• 2002.08a
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• pp.133-134
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• 2002

광회선단위로 교환이 가능한 OXC시스템의 구조, 전광통신망에서 통합 하드웨어 플랫폼을 위한 신호매핑 그리고 UNI, GMPLS 및 LCAS를 이용한 광경로 설정, 해제 방법에 관해 기술한다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.11 s.353
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• pp.192-199
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• 2006

Establishment of bandwidth and effective traffic processing are required to treat various traffics according to a rapid increase in Internet traffic. A path setup algorithm was introduced to support backbone franc processing but the failure probability is increasing according to fixed operation in nodes. In other words, fixed maximum permitted time can be raised failure probability. So as to solve this problem, this paper introduces variable path setup time algorithm which support channel service of excessive traffic that is generated from not allowed channel. We proposed GLSP(Generalized Label Switch Path) setup algorithm that use variable path setup time parameters. This algorithm can improve path setup probabilities of backbone network that is composed of fixed way.

• The KIPS Transactions:PartC
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• v.16C no.4
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• pp.511-520
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• 2009

Grid technology enables high performance computation and mass data processing by connecting geographically distributed computing resources to high-speed network. To carry on grid tasks requiring guaranteed quality of service, we need to build converged infrastructure which controls and manages network resources as well as computing resources. In this paper, we defined grid network service interface and information model to support grid network path, resource creation and reservation. In addition to resource creation and reservation messages of the existing GLIF, grid network path and notification messages were defined in the grid network service interface. We also defined related statuses and messages for two-phase resource reservation mechanism. We designed and implemented network resource management system based on the grid network information model and service interface. We experimented in resource reservation, allocation and release of network resources in grid environment with GMPLS control and transport network.

• Journal of KIISE:Information Networking
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• v.30 no.2
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• pp.270-281
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• 2003

ETF made the RFCs of MPLS technologies for providing the QoS of ATM or Frame Relay and the flexibility&scalability of IP on the Internet services. IETF has been expanding MPLS technologies as a common control component for supporting the various switching technologies called GMPLS. Also, IETF has standardized the signaling protocols based on such technologies, such as LDP, CR-LDP and RSVP-TE. ETRI developed the MPLS system based on ATM switch in order to provide more reliable services, differentiated services and value-added services like the VPN and traffic engineering service on the Korea Public Sector network. We are planning on deploying model services and commercial services on that network. This paper explains the basic functions of LDP, design and development of LDP on our system, and compares with LDP development and operation on other MPLS systems made by Cisco, Juniper, Nortel and Riverstone. In conclusion, this paper deduces the future services and applications by LDP through these explanation and comparison.

• Journal of Communications and Networks
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• v.6 no.3
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• pp.269-279
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• 2004

A new online multi-layer integrated routing (MLIR) scheme that combines IP (electrical) layer routing with WDM (optical) layer routing is investigated. It is a highly efficient and cost-effective routing scheme viable for the next generation integrated optical Internet. A new simplified weighted graph model for the integrated optical Internet consisted of optical routers with multi-granularity optical-electrical hybrid switching capability is firstly proposed. Then, based on the proposed graph model, we develop an online integrated routing scheme called differentiated weighted fair algorithm (DWFA) employing adaptive admission control (routing) strategies with the motivation of service/bandwidth differentiation, which can jointly solve multi-layer routing problem by simply applying the minimal weighted path computation algorithm. The major objective of DWFA is fourfold: 1) Quality of service (QoS) routing for traffic requests with various priorities; 2) blocking fairness for traffic requests with various bandwidth granularities; 3) adaptive routing according to the policy parameters from service provider; 4) lower computational complexity. Simulation results show that DWFA performs better than traditional overlay routing schemes such as optical-first-routing (OFR) and electrical-first-routing (EFR), in terms of traffic blocking ratio, traffic blocking fairness, average traffic logical hop counts, and global network resource utilization. It has been proved that the DWFA is a simple, comprehensive, and practical scheme of integrated routing in optical Internet for service providers.

• Electronics and Telecommunications Trends
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• v.28 no.6
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• pp.49-62
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• 2013

광-회선-패킷 통합 전달망 장비는 광전송망, 회선 망, 패킷 전달망 계층을 하나로 통합한 장비로써, 패킷-회선 교환 전달, ROADM(Reconfigurable Optical Add/Drop Multiplexer) 광파장 교환 전달, GMPLS(Generalized Multi-Protocol Label Switching) 기반 통합제어 및 관리기능을 수행하면서 네트워크 구조의 단순화, 네트워크 제어의 지능화, 그리고 네트워크 용량의 광대역화를 구현한다. 트래픽 폭증과 전송용량 부족 현상을 해결하고, 트래픽 증가 대비 수익의 탈동조화 현상을 극복하기 위해 네트워크 CAPEX(Capital Expenditures)/OPEX(Operating Expenditures)를 절감함으로써 통신사업자의 투자 여건을 우호적으로 조성하면서 최근 주목 받고 있는 기술이다. 본고에서는 광-회선-패킷 통합 전달망의 기술동향을 기술한 것으로써, 배경, 필요성 및 개념 개발동향 및 경쟁기술에 대해서 살펴보고, 기술발전 로드랩 및 주요 기술 동향과 시장 및 사업화 전망에 대해서 분석한다.

• ETRI Journal
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• v.28 no.1
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• pp.119-122
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• 2006

We present an intelligent optical switching structure based on our lambda-group model along with a working scheme that can provide a distinctive approach for dividing complicated traffic into specific tunnels for better optical performance and grooming efficiency. Both the results and figures from our experiments show that the particular channel partition not only helps in reducing ports significantly, but also improves the average signal-to-noise ratio of the wavelength channel and the blocking performance for dynamic connection requests.

• Proceedings of the IEEK Conference
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• 2003.11c
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• pp.101-104
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• 2003

As optical network technology advances, the Dense-Wavelength Division Multiplexing(DWDM) networks have been widely accepted as a promising approach to the Next Generation Optical Internet (NGOI) backbone networks. Especially. a fault/attack management scheme in NGOI backbone networks is one of the most important issues because a short service disruption in DWDM networks carrying extremely high data rates causes loss of vast traffic volumes. In this paper, we suggest a fault/attack management model for NGOI backbone networks and propose a fault/attack recovery procedure in IP/GMPLS over DWDM.

• Electronics and Telecommunications Trends
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• v.31 no.5
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• pp.99-109
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• 2016

IETF Path Computation Element(PCE) 그룹에서는 데이터 전송을 위한 전달 경로를 찾는 엔진 기능을 중심으로 표준화를 진행하고 있다. 망의 상태, 위상, 자원 가용성, 정책을 기반으로 최적의 자원을 할당하는 경로 계산 기능과 구조, 프로토콜 등을 정의하는데 MPLS/GMPLS 망의 제어 평면 프로토콜 기반 전송을 위주로 출발하여 광, 회선 망에서의 적용과 서비스 표준이 실제 사례를 뒷받침하여 발전되었고 현재는 데이터 센터 네트워크, SDN, IoT 분야에서의 활용이 활발하게 논의되고 있다. 본고에서는 경로 계산 기능의 분산을 주요 목적으로 하여 이제는 범용의 전달망 관리 분야로 확대 적용되는 추세의 active stateful PCE와 Traffic Engineering Database (TED), Label Switched Path DB(LSP-DB), PCE Protocol(PCEP) 등을 포함한 관련 표준 현황을 살펴보고 향후 통합 전달망 제어 관리 진화 방향을 소개하고자 한다.