• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.10a
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• pp.353-356
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• 2001

Earlier efforts on optical access concentrated on the design of PONs for the collection and distribution portion of the access network. PON architecture is very simple but it requires MAC protocol for control of upstream traffic. This paper proposes a MAC protocol for a broadband access network using an ATM Passive Optical Network supporting CBR/rtVBR, nrtVBR, UBR and ABR traffic. For the proposed MAC scheme, we present grant field format, minislot format, and bandwidth allocation algorithm. from the simulation result, we have confirmed that our proposed scheme ran reduce the average tell delay in comparison to that of conventional MAC schemes.

• The KIPS Transactions:PartC
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• v.10C no.4
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• pp.441-446
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• 2003

Earlier efforts on optical access concentrated on the design of PONs for the collection and distribution portion of the access network. The PON architecture is very simple but it requires a MAC protocol for control of upstream traffic. The MAC protocol must support QoS (Quality of Service) administration function by various traffic class, efficient dynamic bandwidth assignment function, CDV (Ceil Delay Variation) minimization function etc. This paper proposes a dynamic bandwidth assignment algorithm of the MAC protocol for a broadband access network using an Ethernet Passive Optical Network supporting various traffic class. We compare our proposed with MDRR algorithm using simulation, and confirmed that our proposed Request-Counter algorithm produces shorter average cell delay.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.5 s.347
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• pp.68-76
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• 2006

We propose a low noise broadband light source (BLS) and investigate a cost-effective wavelength division multiplexing-passive optical network (WDM-PON) for the convergence of broadcasting and data service. The proposed BLS is used for an injection light of wavelength-locked Fabry-Perot laser diodes (F-P LD) and helps the color-free operation of dense WDM-PON (DWDM-PON). In addition, we apply this BLS to a optical source for overlay of digital broadcasting channel on the WDM-PON.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37B no.12
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• pp.1168-1173
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• 2012

In this paper, we propose a protection architecture of passive optical network (PON) system by using two optical line terminals (OLTs). Using this scheme, the network can sustain services to access area and restores normal operation in faulty conditions. Unlike existing systems, the proposed one increases the efficiency of the system by operating both OLTs using different wavelengths in normal condition. During protection mode, a Shared-bandwidth allocation scheme is employed to maximize the utilization efficiency. Performance analysis shows that the proposed scheme can provide reliability to Ethernet-based PON system very efficiently.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.172-174
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• 2002

Ethernet PON(Passive Optical Network)은 최근 들어 활발하게 연구되고 있는 경제적이고 효율적인 가입자망 구조이다. 본 논문에서는 OPNET 시뮬레이션 도구를 사용하여 Ethernet PON 시뮬레이션 모델을 구현하고, 시뮬레이션 한다. OLT(Optical Line Termination)에 연결되는 ONU(Optical Network Unit)의 개수, 트래픽 및 네트워크 파라미터에 대한 ONU의 버퍼 크기(buffer size)를 분석하고, 이 결과로서 실제 네트워크에 적용할 효율적이고 적정한 ONU의 버퍼 크기를 제안한다.

• Journal of Convergence for Information Technology
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• v.10 no.1
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• pp.22-27
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• 2020

With the deployment of 5G infrastructure, content delivery network (CDN) will be a key role to provide explosive growing services for the independent media and YouTube which contain high-speed mobile contents. Without a local cache, the mobile backhaul and fronthaul should endure huge burden of bandwidth request for users as the increase number of direct accesses from contents providers. To deal with this issue, this paper fist presents both fronthaul solutions for CDN that use dark fibers and a passive optical network (PON). On top of that, we propose the aggregated content request specialized for PON caching and evaluate and compare its performance to legacy schemes through the simulation. The proposed PON caching scheme can reduce average access time of up to 0.5 seconds, 1/n received request packets, and save 60% of backhaul bandwidth compared to the no caching scheme. This work can be a useful reference for service providers and will be extended to further improve the hit ratio of cache in the future.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.175-177
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• 2002

Ethernet PON(Passive Optical Network)의 핵심 기술 충의 하나인 MAC(Media Access Control) 프로토콜은 ONU(Optical Network Unit)들이 상향으로 트래픽을 전송할 때 공유되어 있는 링크상의 충돌을 방지하고, 효율적인 대역폭을 할당하기 위만 스케줄링 알고리즘을 포함하고 있다. 본 논문에서는 차세대 가입자 망인 Ethernet PON의 성능을 최대화하기 위해, 가입자 망의 특성을 고려만 동적 슬롯 할당 TDHA(Time Division Multiple Access) 방식의 MAC 프로토콜을 제안한단. 이를 검증하기 위하여 OPNET 시뮬레이션 도구를 이용해 Ethernet PON 모델을 설계하고 시뮬레이션 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.05a
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• pp.51-54
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• 2008

PON(Passive Optical Network) is the promising technology applicable to TPS(Triple Play Service). To improve process the packet, MAC(Multiple Access Control) is the most important technology in the PON. The core of MAC is DBA(Dynamic Bandwidth Assignment), it classifies SR-DBA(Status Report DBA) and NSR-DBA(Non Status Report DBA). But GPON DBA is using BPON's DBA, so it's bad in network efficiency. This study develop BR(Borrow-Refund)-DBA for improve network efficiency and prompt process. For take the gauge of performance evaluation, estimate about throughput, fairness and queue delay in SR-DBA and NSR-DBA environment

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11b
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• pp.1257-1260
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• 2003

초고속 인터넷 서비스가 보급된 이후 가입자들은 점점더 많은 서비스를 요구하게 되고, 이에 따라 더 많은 대역폭을 필요로 하게 되었다. 저렴한 비용으로 사용자들의 요구 사항을 충족시킬 수 있는 방안으로 E-PON(Ethernet-Passive Optical Network) 기반의 광가입자망에 대한 관심이 증가하고 있다. 이에 본 논문에서는 E-PON 기반 광가입자망의 핵심적인 구성 요소인 eOLT(enhanced Optical Line Termination) 시스템에서의 VLAN(Virtual Local Area Network) 서비스 요구 사항 및 제공 구조를 제시 하고자 한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.28 no.1B
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• pp.18-26
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• 2003

Earlier efforts on optical access concentrated on the design of PONs for the collection and distribution portion of the access network PON architecture is very simple but it requires MAC protocol for control of upstream traffic This paper proposes a Request-Counter MAC protocol for a broadband access network using an ATM Passive Optical Network supporting CBR/rtVBR, nrtVBR, UBR and ABR traffic For the proposed MAC scheme, we present Grant Field format, Minislot format, and bandwidth allocation algorithm From the simulation result, we have confirmed that our proposed scheme can reduce the average cell delay in comparison to that of conventional MAC schemes.