Ethernet-based Passive Optical Network Research Articles

Design of a mutual authentication based on NTRUsign with a perturbation and inherent multipoint control protocol frames in an Ethernet-based passive optical network

Identity-related security issues inherently present in passive optical networks (PON) still exist in the current (1G) and next-generation (10G) Ethernet-based passive optical network (EPON) systems. We propose a mutual authentication scheme that integrates an NTRUsign digital signature algorithm with inherent multipoint control protocol (MPCP) frames over an EPON system between the optical line terminal (OLT) and optical network unit (ONU). Here, a primitive NTRUsign algorithm is significantly modified through the use of a new perturbation so that it can be effectively used for simultaneously completing signature and authentication functions on the OLT and the ONU sides. Also, in order to transmit their individual sensitive messages, which include public key, signature, and random value and so forth, to each other, we redefine three unique frames according to MPCP format frame. These generated messages can be added into the frames and delivered to each other, allowing the OLT and the ONU to go ahead with a mutual identity authentication process to verify their legal identities. Our simulation results show that this proposed scheme performs very well in resisting security attacks and has low influence on the registration efficiency to to-be-registered ONUs. A performance comparison with traditional authentication algorithms is also presented. To the best of our knowledge, no detailed design of mutual authentication in EPON can be found in the literature up to now.

WDM 기반 2-OLT 구조를 이용한 PON 시스템 보호 및 절체

본 연구에서는 2개의 OLT를 이용한 PON 보호/절체에 관해 제안하였다. 본 제안된 방식을 이용하면 고장 상황에서도 가입자 영역에 서비스를 지속적으로 할 수 있고, 정상적인 동작을 수행할 수 있게 된다. 기존 보호/절체 방식과의 차이점은 제안된 방식의 경우 두 OLT에 다른 파장을 적용함으로써 정상 상태에서 두 OLT를 모두 사용하여 이용 효율을 높인다는 점이다. 보호 모드에서는 Shared-bandwidth 할당 방식을 적용함으로써 효율을 극대화하였다. 성능 분석을 통해 제안된 시스템이 효율적으로 이더넷 기반 PON 시스템의 신뢰성을 높일 수 있음을 확인하였다. 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.

Topology optimization for hybrid optical/wireless access networks

Hybrid Wireless–Optical Broadband Access Networks (WOBANs) are gauging momentum as flexible, bandwidth-effective, and cost-effective solutions for providing connectivity to residential users in metropolitan areas. In this work, we address the issue of designing the topology of deployed WOBANs. Namely, we consider the case where the coverage of a Ethernet-based Passive Optical Network (EPON) is extended by an additional wireless segment which features multi-hop wireless links operated either according to the IEEE 802.11 standard, or to the IEEE 802.16 one. We propose a mathematical programming model which optimizes the overall WOBAN topology in terms of deployment cost, while accounting for the specific traffic requirements of the residential users, and the specific features of the technological components. The potentials of the proposed model are showcased by deriving and commenting numerical results obtained when planning realistic WOBAN scenarios.

Joint Bandwidth Scheduling to Support Differentiated Services and Multiple Service Providers in 1G and 10G EPONs

Dynamic bandwidth allocation (DBA) is one of the key issues for the current (1G) and next-generation (10G) Ethernet-based passive optical network (EPON) systems. We present a novel bandwidth scheduling scheme that integrates specific scheduling implementations in the optical line terminal and optical network units. This scheduling enables multiservice access with scalable quality of service support for the triple-play (video, voice, and data) services and open access. Our simulation results show that the proposed scheduling algorithm performs very well in supporting service differentiation and fair allocation of bandwidth to different service providers. A performance comparison between 1G and 10G systems is also presented. To the best of our knowledge, no detailed study of DBA in a 10G EPON can be found in the literature so far.

Implement Mechanism on Distributed EPON DBA Based on Utility

PDF HTML阅读 XML下载 导出引用 引用提醒 基于效用EPON分布式动态带宽分配实现机制 DOI: 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: Supported by the National High-Tech Research and Development Plan of China under Grant No.2007AA01Z203 (国家高技术研究发展计划(863)); the National Basic Research Program of China under Grant No.2007CB307101-4 (国家重点基础研究发展计划(973)) Implement Mechanism on Distributed EPON DBA Based on Utility Author: Affiliation: Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:EPON(Ethernet-based passive optical network)作为基于光纤的宽带网络接入技术,已经成为下一代接入网络的关键技术之一,但是IEEE 802.3ah EPON的Polling机制存在带宽使用率不高的问题,其DBA(dynamic bandwidth allocation)算法产生UWR(unused window remainder),USR(unused slot remainder),UQR(unused queue remainder)和UPR(unused package remainder),浪费了许多带宽资源.IPACT(interleaved polling with adaptive cycle time) EPON提出了一个带宽使用率较高的新的Poling机制,但没有解决DBA算法存在的缺点.在IPACT基础上,提出了一个基于效用的分布式EPON DBA实现机制,实现了对不同SLA(service level agreement)用户的相同业务类应用的差分处理.通过一种集中递归效用算法,有效地消除了再生UWR,通过一种分布式递归效用算法,有效地消除了UQR,通过一个分布式UPR消除机制,减少了UPR.提出了一个基于交织接力棒的USR消除机制,提高了消除USR条件满足的概率,通过将交棒者的USR追加到接棒者的授权中,提高了带宽的使用效率.仿真结果很好地验证了该机制的优点. Abstract:EPON (Ethernet-based passive optical network) is optical-fiber-based access technology and is becoming a primary one for the next generation access network. But the Polling mechanism of IEEE 802.3ah EPON has low bandwidth efficiency, and many available bandwidths are wasted through UWR (unused window remainder), USR (unused slot remainder), UQR (unused queue remainder), and UPR (unused package remainder) produced by its DBA (dynamic bandwidth allocation) algorithm. IPACT (interleaved Polling with adaptive cycle time) EPON presents a new Polling mechanism with high bandwidth efficiency, but its DBA algorithm has the same disadvantages as IEEE 802.3ah. Based on IPACT, this paper presents an implement mechanism on distributed EPON utility DBA, it can provide user service different treatment according to his SLA (service level agreement). By a concentrated and a distributed recursive utility algorithms, it effectively diminishes UWR-reproduced and UQR. By a distributed UPR diminishing mechanism, it reduces UPR. By putting forward a USR diminish mechanism based on interleaved baton, it increases the success probability of diminishing USR, and by adding the USR of baton-sender to the grant of his baton-receiver, it improves the bandwidth efficiency. The simulation results verify it merits well. 参考文献 相似文献 引证文献

Efficient and fine scheduling algorithm for bandwidth allocation in ethernet passive optical networks

A novel fine scheduling algorithm is introduced for upstream bandwidth allocation in an Ethernet-based passive optical network. This scheduling algorithm consists of an inter optical network unit (ONU) scheduler at the optical line terminal (OLT) and an intra-ONU scheduler at each ONU. In the inter-ONU scheduling, a novel GATE/REPORT approach is introduced to eliminate the unused remainders without transmission delay and maximize the utilization of bandwidth. Our novel intra-ONU scheduler gives fair bandwidth allocation to the queues of different priorities for each user in a hierarchical and decentralized way. Numerical results have shown that our overall scheduling algorithm can fulfill various requirements of delay and throughput for the transmission of multimedia traffic for each end user

Low-cost and high-performance APD burst-mode receiver employing commercial TIA for 1.25-gb/s EPON

A 1.25-Gb/s burst-mode receiver for the application of 32 splits and 20-km transmission in Ethernet-based passive optical network was developed using a general planar type avalanche breakdown photodiode and a low-cost continuous-mode transimpedance amplifier (TIA). The largest loud/soft ratio (27.3 dB) and high sensitivity (-33.3 dBm) were achieved in 896-ns guard band. The minimum automatic gain control (AGC) time of the TIA was obtained without using a high value external AGC capacitor that is needed for the stable continuous operation. The guard time could be minimized while maintaining the burst performances due to the fast laser on-off time of the optical network units.

Dynamic bandwidth allocation for quality-of-service over ethernet PONs

Ethernet-based passive optical network (EPON) technology is being considered as a promising solution for next-generation broadband access networks due to the convergence of low-cost Ethernet equipment and low-cost fiber infrastructures. A major feature for this new architecture is the use of a shared transmission media between all users; hence, medium access control arbitration mechanisms are essential for the successful implementation of EPON: i.e., to ensure a contention-free transmission and provide end users with equal access to the shared media. We propose to use the multipoint control protocol defined by the IEEE 802.3ah task force to arbitrate the transmission of different users, and we present different dynamic bandwidth allocation (DBA) algorithms to allocate bandwidths effectively and fairly between end users. These DBA algorithms are also augmented to support differentiated services, a crucial requirement for a converged broadband access network with heterogeneous traffic. We show that queueing delays under strict bandwidth allocation algorithms result in an unexpected behavior for certain traffic classes, and we suggest the use of DBA with appropriate local queue management to alleviate this inappropriate behavior. We conduct detailed simulation experiments to study the performance and validate the effectiveness of the proposed protocols.