一种新的基于通道保护的SDH环自愈机制

ＳＤＨ网的自愈机制是ＳＤＨ网生存性研究的主要内容,也是确保ＳＤＨ正常运行的关键。本文在分析了传统的ＳＤＨ自愈环的基础上,提出了一种新的双向四纤智能通道保护型自愈环（ＢＳＨＲ／４１Ｐ）自愈机制,并通过计算机模拟。对其改进进行了分析。     

智能配网自愈过程过电压影响因素分析

自愈是提高智能配电网免疫的一项重要功能,自愈功能,即智能配电网的自我预防及恢复能力,它提高了智能配电网的供电可靠性,确保配网系统安全、平稳地运行,保障了用户的用电安全。本文对智能配网自愈过程中过电压的影响因素进行分析。     

基于物联网的水质监测系统设计

针对传统水质监测方式中存在的测试周期长、数据反馈速度慢等弊端,本文提出一种智慧型水质实时监测系统。本系统以无线传感器网络、网络摄像机以及各类水质污染监测传感器以及后台数据库为核心,开发具有自愈能力的自组网小型水质监测系统,实现对水产养殖用水的水位、溶解氧、PH值、温度、图像等多参数的采集,并通过无线网络实现传感器检测节点和协调器节点之间数据快速、准确的传输,进而对多参数进行实时远程监测,解决水产养殖业水质实时监测和管理问题。     

Control algorithms of SONET integrated self-healing networks

As the deployment of high-speed fiber transmission systems has been accelerated, they are widely recognized as a firm infrastructure of the information society. In SONET, the self-healing networks have been highlighted as one of the most advanced mechanisms used to realize SONET survivable networks. Several schemes have been proposed and studied due to the rapid progress in the development of highly intelligent network elements (NEs). A DCS based distributed self-healing network is discussed from the viewpoint of its control algorithms. The self-healing algorithm, called TRANS, is explained in detail. It possesses such desirable features as providing fast and flexible restoration with line and path level restoration applied to an individual STS-1 channel, the capability of handling multiple and even node failures, and so on. Both software simulation and hardware experiment verify that TRANS works properly in a real distributed environment, the result of which is shown in the paper. In addition, the combined use of TRANS and ring restoration control is proposed taking into account a practical SONET application     

无线通信中的绿色自组织技术

针对未来通信系统的节能问题,文章介绍了具有自管理、自配置、自优化以及自愈能力的绿色自组织网络及其相应的关键支撑技术,如融合网络架构下的业务预测与感知、新型无线网络架构下的智能资源分配、异构网络间的绿色协作和动态智能组网等。在此基础上文章提出了一种联合考虑能耗及负载均衡的动态扇区、小区关断方法,从而在保证用户服务质量的条件下有效降低网络的能量消耗。     

基才ZigBee的自愈自组网的设计与应用

ZigBee技术为低功耗、低成本、低复杂度、适中数据传输率和且具有自组织功能的无线监控网络的组建提供了坚实的技术基础。为了增强无线网络在无人值守、远程监控等应用中的稳定性及智能化,本文在分析ZigBee协议体系结构以及Z_Stack协议栈基础上,研究了如何基于CC2530组建具有自组网、自愈特性的ZigBee无线网络,通过对无人值守的通信基站的交流电压、电流和温湿度环境等参数的远程实时监控的试验,实现了网络的自组网与自愈功能,增强了网络的稳定性及智能化。     

面向视频云微服务系统的智能运维技术

提出了一种基于人工智能(AI)的保障视频云体验质量(QoE)的系统架构。该系统针对多个维度创建运维知识图谱,例如运行数据、运行环境、运维数据,以用于建模、感知、映射和分析。在对系统的微服务保障中,运用了图神经网络(GNN)等方法进行分类和预测。通过知识图谱和机器学习,该系统可实现实时监控、自愈恢复、智能预测和主动运维,从而实现QoE的智能保障。     

A self-healing ATM network based on multilink principles

Self-healing is the ability of a network to reconfigure itself around failures such that calls in progress are not dropped and suffer of no or almost no degradation in quality of service. Providing self-healing capabilities in all parts of the future ATM network in a cost effective way is therefore a key challenge. A new self-healing method based on the multilink concept is presented for dedicated parts of the ATM network, such as, for instance, feeder networks. In the multilink concept that is proposed, the cells of an ATM connection carried by a multilink are distributed over several physical links. If a physical link supporting the multilink fails, the cells will be distributed among the remaining physical links thus providing a self-healing capacity. In this way the quality of service can be maintained at the expense of a higher load on the remaining physical links. The speed of restoration only relies on the detection and signaling of the failure since spare capacity is available on the very multilink. The sharing of spare capacity in addition to the statistical multiplexing gain provides a cost effective self-healing method and leads to a simplified network resource management. The proposed multilink concept is based on an extension of the multipath self-routing concept, which is currently applied by Alcatel in its ATM switching fabric     

Flexible synchronous broad-band subscriber loop system: opticalshuttle bus

A flexible, synchronous, broadband subscriber loop system called the optical shuttle bus is discussed. The emphasis is on the proposed design architecture and performance of a 1.8-Gb/s prototype system. The optical shuttle bus is constructed of multigigabit/second intelligent optical shuttle nodes (OSNs). The software-defined OSNs allow the bus to be configured as a synchronous transmission network with any topology and provides flexible channel allocation by means of a drop/insert/cross-connect function. The OSN can be configured as a highly reliable network by virtue of its self-healing functions such as line switch, bypass, and loop back. The proposed bus architecture has been successfully applied in a 1.8-Gb/s prototype in which three OSNs are connected by one 10-km and two 5-dm single-mode fibers in a ring configuration. Very compact and inexpensive equipment is realized by using high-speed ICs. Experimental results show the proposed architecture to be a powerful one for the realization of synchronous broadband subscriber loop systems     

自组织服务网络的形式化建模与分析

自组织技术在组网技术上,得到了广泛的应用,但是将自组织技术应用于服务组合中,国内外的研究却非常少。将自组织思想纳入服务组件的组合过程中,可形成具有一定智能的服务网络,增强服务网络的适应性,为服务组合提供一种新的思路。首先由自组织、自组织网络引出自组织服务网络,然后用抽象状态机(ASM)对自组织服务网络进行了建模,并对该模型的自组织、自愈合、自优化、自保护、自均衡等性质进行了分析。     

A passive protected self-healing mesh network architecture andapplications

The self-healing mesh network architecture using digital cross-connect systems (DCSs) is a crucial part of an integrated network restoration system. The conventional DCS self-healing networks using logical channel protection may require a large amount of spare capacity for network components (such as DCSs) and may not restore services fast enough (e.g., within 2 s). The authors propose a passive protected DCS self-healing network (PPDSHN) architecture using a passive protection cross-connect network for network protection. For the PPDSHN architecture, network restoration is performed in the optical domain and is controlled by electronic working DCS systems. Some case studies have suggested that the proposed PPDSHN architecture may restore services within a two-second objective with less equipment cost than the conventional DCS self-healing network architecture in high-demand metropolitan areas for local exchange carrier networks. The proposed PPDSHN architecture may apply to not only the centralized and distributed control DCS network architectures, but also asynchronous, SONET and ATM DCS networks. Transparency of line rates and transmission formats makes the PPDSHN network even more attractive when network evolution is a key concern of network planning     

How technology shapes network management

Five areas of technological advancement that affect network management are examined. They are: expert systems and machine learning/induction: fault tolerance; object-oriented databases; facsimile; and ease of use (user friendliness). The following points are emphasized. Machine induction will give network managers the opportunity to understand reasons behind actions instead of just seeing the results. Fault tolerance means no scheduled downtime, freedom from obsessive machine management, enhanced opportunity to manipulate processes, and ease of expansion. When object-oriented data management systems are used in the development of network management systems, development efforts are significantly reduced because the same model is used for both programming and database accessing, and the model is a much better representation of the reality of the network than current data models. A major breakthrough will be the ability to access the same data items from two or more database management schemes simultaneously. Facsimile will experience rapid growth and will be integrated with other services. Ease of use is the central element for the intelligent use of future systems     

Restoration message transfer mechanism and restorationcharacteristics of double-search self-healing ATM network

The self-healing network is particularly interesting with regard to ATM networks, because the restoration time can be shortened by using the advantages of the ATM network. This paper studies a self-healing ATM network based on virtual path (VP) protection switching. First, a novel self-healing algorithm-the double-search self-healing algorithm-is proposed. It is shown that this algorithm can restore failed bidirectional VPs faster and find alternate VPs more effectively than existing self-healing algorithms. Second, it is shown that the restoration information for self-healing control (SHC) messages must be transferred by specific cells carrying the control and OAM information (Ic&o). Message parameters and a cell format are proposed. Third, evaluation of the restoration characteristics using the proposed self-healing algorithm by computer simulation indicates that good performance against a transmission link failure is obtained even in a large-scale network model with 110 nodes. The results also indicate that the VP group (VPG) method can improve the restoration time without reducing the restoration ratio     

A Q Learning and Fuzzy Q Learning Approach for Optimization of Interference Constellations in Femto–Macro Cellular Architecture in Downlink

The reduction in the cost and enhancement in the network coverage and capacity are the main objectives in the establishment of mobile networks. These objectives were the key force behind the idea of femtocells deployment. But, there are many technical issues for the femtocells deployment with already existing macro network. Cross-tier interference is one of the main challenge that must have to be resolved for smooth operation of macro–femto network. This paper gives self-optimizing and self-healing technique that utilizes Q-learning and fuzzy Q-learning algorithm for the objectives of enhancement in the network capacity and spectral efficiency. In our proposed scheme, each macro base station acts as an agent which interacts with its local environment (all the femtocells and mobile stations under its coverage area), gathers the information and takes the suitable actions correspondingly. For the objective of controlling cross-tier interference, macrousers are rescheduled in such an intelligent way that performance of the femtousers, located on the overlapped spectral portion, is not degraded. The simulation results confirm our proposed approach to improve the network capacity and spectral efficiency as well as sharp convergence, which designates its capability to meet the self organizing network requirements set by 3GPP.     

PON在维护管理中面临的问题与应对策略

随着PON网络规模的扩大和应用场景的增多,PON的维护管理面临着日益严峻的挑战。文中旨在分析PON维护管理中存在的问题,并提出了相应的应对策略,以促进PON网络的健康发展和持续优化。目前,存在的主要问题包括光分布网络监测与故障检测、网络资源管理与优化、安全与隐私保护、升级与迁移策略。针对这些问题,文中提出了监测工具与设备使用、故障自愈与自适应、智能带宽分配算法、负载均衡策略优化、加密通信与身份验证技术、安全漏洞监测与修复、平滑升级与设备更新、网络拓扑规划与变更管理等应对策略。     

Design of an Intelligent Self-Healing Smart Grid using a Hybrid Multi-Agent Framework

This paper discusses the applications of a hybrid multi-agent framework for self-healing applications in an intelligent smart grid system following catastrophic disturbances such as loss of generators or during system fault.The proposed hybrid multi-agent framework is a hybrid of both centralized and decentralized scheme to allow distributed intelligent agent in the smart grid system to make fast local decision while allowing the slower central controller to judge the effectiveness of the decision made by the local agents and to suggest more optimal solutions.     

Dynamic routing network algorithm of low voltage based on link quality

Power distribution network is a dedicated transmission network for power. If you want to use it as communication network, the network traffic will become very complicated. Low voltage distribution network topology is very complex and quite different in different distribution network; and different load leave or input power line will cause a strong performance of channel variability. It is because of these features of low voltage distribution network that it difficult to networking and the network is easily destroyed. This paper presents a dynamic routing algorithm, based on link quality, to improve the reliability of low voltage distribution networks. The algorithm can eventually form an 8-layer structure of the tree topology, and can achieve network self-healing capabilities when the link is broken. The algorithm is suitable for a variety of network physical topology, and finally be able to form a tree structure, thus effectively improving the reliability and system flexibility of communication network. Through the simulation on NS2, we can see the feasibility and network self-healing of the algorithm.     

基于双向CATV系统的增值业务

采用Cable Modem技术将HFC网建成高速数据交换网络是利用现有资源开展增值业务的主要手段，从组网的原理与功能等方面对利用双向CATV系统开展宽带综合业务、视频点播、小区住宅智能化管理以及可视对讲门禁等的方法进行分析。     

无线传感器网络中自治愈的群组密钥管理方案

 群组密钥管理的自治愈机制是保证无线传感器网络在不可靠信道上进行安全群组通信的重要 手段.基于采用双方向密钥链的群组密钥分发与撤销方法,提出了一个无线传感器网络中具有撤销能力的自治愈群组密钥管理方案.该方案实现了群组密钥的自治愈功能和节点撤销能力, 能够满足在较高丢包率的无线通信环境下传感器网络群组密钥管理的安全需求,确保了群组密钥保密性、前向保密性和后向保密性等安全属性.性能分析表明,该方案具有较小的计算和通信开销,能够适用于无线传感器网络.     

一种高效的基于BC图的t/k-诊断算法

为了提高系统级故障诊断中的诊断度,人们以牺牲很小一部分结点不能正确诊断为代价,提出了t/k-故障诊断策略.BC图是包括了超立方体和多种变形立方体的一类图.对于结点总数为N的BC图,本文提出了一个O(N log2N)的t/k-故障诊断算法.目前尚未有相关t/k-故障诊断算法的文章发表,但与著名的悲观一步t-故障诊断算法(t/k-故障诊断算法在k=1时的情况)的O(N2.5)相比较,在时间复杂度上本文算法是高效的.