基于图卷积神经网络的软件定义电力通信网络路由控制策略

传输时延和数据包丢失率是电力通信业务可靠传输重点关注的问题,该文提出一种面向软件定义电力通信网络的最小路径选择度路由控制策略。结合电力通信网络软件定义网络(SDN)集中控制架构的特点,利用图卷积神经网络构建的链路带宽占用率预测模型(LBOP-GCN)分析下一时刻路径带宽占用率。通过三角模算子(TMO)融合路径的传输时延、当前时刻的路径带宽占用率和下一时刻的路径带宽占用率,计算出从源节点到目的节点间不同传输路径的选择度(Q),然后将Q值最小的路径作为SDN控制器下发的流表项。实验结果表明,该文所提出的路由控制策略能有效减小业务传输时延和数据包丢失率。

     

基于图卷积神经网络的软件定义电力通信网络路由控制策略

传输时延和数据包丢失率是电力通信业务可靠传输重点关注的问题,该文提出一种面向软件定义电力通信网络的最小路径选择度路由控制策略.结合电力通信网络软件定义网络(SDN)集中控制架构的特点,利用图卷积神经网络构建的链路带宽占用率预测模型(LBOP-GCN)分析下一时刻路径带宽占用率.通过三角模算子(TMO)融合路径的传输时延、当前时刻的路径带宽占用率和下一时刻的路径带宽占用率,计算出从源节点到目的节点间不同传输路径的选择度(Q),然后将Q值最小的路径作为SDN控制器下发的流表项.实验结果表明,该文所提出的路由控制策略能有效减小业务传输时延和数据包丢失率.     

多路径并行传输中传输路径选择策略

该文首先在实验分析的基础上,发现在互联网端到端传输层多路径并行传输(CMT)中,当端到端关联中路径间的特性参数如丢包率和延迟存在较大差异时,部分路径并行传输的吞吐量优于全部并行传输的吞吐量,从而论证了多路径并行传输情况下传输路径选择的必要性及对传输性能的影响。其次,建立了路径吞吐量与不同丢包率和延迟的拟合关系,并以路径吞吐量为路径权值,提出了一种基于路径权值的传输路径选择策略CMT-PW(Path Weight),给出了该策略的算法实现和相应的伪代码实现。仿真实验表明,CMT-PW策略优于传统CMT策略。     

最小故障风险损失的弹性光网络多链路故障概率保护策略

针对弹性光网络中多链路故障100%保护的资源消耗冗余度较高的问题,该文提出一种最小故障风险损失的概率保护(MFRL-PP)策略,在多链路故障时为业务提供高效率的概率保护。在MFRL-PP策略中,该文设计了一个综合考虑链路负载和故障风险的代价函数,为业务选择故障风险小且频谱资源消耗少的概率保护光路。当最小故障风险路径无法传输时,为进一步降低概率保护光路的故障风险损失,该文还设计了一种非对称业务流分流的最小故障风险损失概率保护机制,以便选择故障风险损失最小的分流路径组作为传输光路。同时,在传输光路的频谱分配阶段,提出了基于最大频谱重合度的可用频谱块选择策略,以减少频谱碎片的产生。仿真结果表明所提策略不仅有效地提升了频谱利用率,还较好地实现了带宽阻塞率与故障风险的平衡。     

专网：链路聚合

视频监控项目需要高带宽进行传输，为了满足客户对于传输带宽不断增加的需要，一般采用基于链路聚合的技术，利用两个或多个网络和通信线路来同时传输网络流量，达到带宽扩容的目的。这个方法在实际工程中收到了良好的效果，本文针对链路聚合在专网业务中的实现方法做了详细介绍。     

EDF调度算法在直通式交换以太网上的实现

提出了一种FTT(FleXible Time-Triggered communication paradigm)的改进调度模型.实现了周期性硬实时消息在基于成熟商用组件技术(COTS)的交换式以太网上的实时传输.并针对周期性实时消息在直通式交换以太网上传输提出了一种基于EDF的实时性调度算法.仿真实验表明该算法在提高网络的聚合带宽方面具有明显的优点.     

弹性光网络中面向任播业务的节能路由算法

为提高数据中心间光互联网络的能效,面向任播业务提出一种具有业务持续时间感知的混合路径传输节能路由算法.为了减少新建光路和工作元器件数量,优先采用单路径传输;若业务阻塞则以传输能耗最小化为目标进行多路径传输.除此之外,引入基于频谱预留的业务疏导策略来降低保护带宽和光收发器的开销.仿真结果表明:与传统节能路由算法相比,所提算法在显著降低网络能耗的同时,有效避免了业务阻塞率的过度增加,实现了网络能耗与性能的平衡.     

基于下一跳可用带宽和链路利用率的路径选择算法

路径选择算法的优劣直接影响着网络性能。基于最大可用带宽选路的ESG算法在下一跳链路带宽不同时,存在次优选路决策问题。本文提出一种ESG的改进算法——IESG,该算法将下一跳链路的可用带宽和链路利用率统一考虑,生成反映下一跳链路传输能力的链路传输能力因子,以其作为路径选择决策的依据。仿真结果表明,IESG算法克服ESG算法的不足,具有较高的选路成功概率且执行复杂度相当。     

安全保障：无线Mesh网络中支持QoS的DSR路由协议的改进与实现

随着无线Mesh网络传输多媒体业务需求的增加,要求网络支持服务质量（QoS）,本文基于DSR协议设计了一个支持QoS的路由协议算法QDSR（QoS-DSR）。该算法保证了数据流的带宽、时延的QoS需求,根据路径跳数和节点拥塞情况定义路由代价函数,选择最优路径。仿真结果表明,与DSR相比,QDSR提高了网络吞吐量,降低了平均端到端延时,提高了网络利用率,更好地满足业务的QoS需求,并且具有更强的适用性和可扩展性。     

认知网络中基于用户带宽需求的频谱接入策略

针对认知网络中的频谱接入问题,基于多类用户不同带宽需求提出了一种新的频谱接入策略,即基于用户带宽的动态信道接入策略(BRDSA)。首次提出考虑拥有不同带宽需求的主用户和次用户利用频谱聚合技术进行频谱接入,而频谱聚合技术能够提高次用户对离散频谱的利用率。根据相关网络模型,利用排队理论和马尔科夫模型对整个系统状态进行了分析。仿真结果表明这种动态频谱接入策略极大地提高了频谱利用率。     

移动IP网络多层次移动支持机制的研究

首先对业界提出的支持网络移动性的方法从网络分层的层面进行分类和比较,将支持移动性的机制分为三个层次机制:网络层移动性机制、传送层移动性机制,应用层移动性机制、对其中代表性的机制进行分析和阐述,并在此基础上,提出多层次支持IP移动性的模型和机制——多层自适应移动策略表(MLSA-MPT)机制,将不同层次(网络层和应用层)的移动性支持机制结合起来,使网络能够根据业务的实际需求,通过动态选择不同层次的移动支持机制,完成多业务和多应用环境下对移动性的支持。     

基于工作流管理和策略管理的下一代互联网IP业务管理系统体系结构及应用

为了实现下一代互联网IP业务的业务流程自动化、业务管理灵活性和动态性,适应新业务的可扩展性和对业务的有效管理,在WfMC工作流参考模型和IETF策略框架的基础上,提出了基于工作流管理和策略管理的下一代互联网IP业务管理系统的体系结构,详细分析了体系结构中的构成组件和相关功能,并给出了基于该体系结构的NGIIP业务开通管理流程场景的应用实例。     

Path selection with class distribution information in theintegrated network

In an integrated network, multiple service classes may exist with different priorities and quality-of-service (QoS) characteristics. Path selection algorithms play an essential role in supporting the QoS requirements of a session in the integrated network. However the existing path selection algorithms may allow a session of a high priority class to be preempted instead of that of the lower priority class. We analyze the mentioned problem and propose a new path selection algorithm which uses not only the amount of residual bandwidth but also the class distribution information of residual bandwidth (RB-CDI) in its path selection procedure     

Distributed address auto configuration protocol for Manet networks

In heterogeneous network environments, the network connections of a multi-homed device may have significant bandwidth differential. For a multi-homed transmission protocol designed for network failure tolerance, such as SCTP, path selection algorithms for data transmission drastically affect performance. This article studies the effect of path bandwidth differential on the performance of retransmission strategies in multi-homing environments. It identifies that fast retransmission on an alternate path may cause receive buffer blocking when path bandwidth differential is significant and the receive buffer is limited. A theoretical model is proposed for selecting retransmission path during the fast retransmission phase, based on receive buffer and path conditions. From these observations and analysis results, this article proposes that path selection strategies for transmitting new data and retransmitted data should be decoupled. A new path selection scheme is proposed and evaluated through SCTP simulations.     

User‐centric context data collection and provision harnessing Content‐Centric Networking paradigm

A comprehensive context management approach is necessary in the era of ubiquitous technologies, and efficient context data collection is one of the most fundamental and important processes for realizing comprehensive context management. Traditional context data collection approaches are based on Transmission Control Protocol (TCP) or User Datagram Protocol (UDP) over Internet Protocol (IP), which has several disadvantages, such as lack of efficient mobility support, security and data transfer efficiency. Content‐Centric Networking (CCN), on the other hand, provides advantages in terms of mobility, security and bandwidth efficiency in comparison with IP. In this paper, we introduce our user‐centric comprehensive context management framework, and propose a secure and efficient context data collection and provision approach based on the framework using CCN as a network and transport layer. This context collection approach provides a flexible security mechanism by introducing three levels of security type. It also provides bandwidth efficiency by taking advantage of CCN's content caching; performance evaluation results show that our approach can reduce bandwidth consumption up to 99% for pull and up to 46% for push in comparison to a UDP/IP‐based system. Our approach also provides advantages in supporting mobility and leveraging multiple interfaces. Copyright © 2013 John Wiley & Sons, Ltd.     

Research on distributed mobile management of satellite network based on software define network

Distributed mobility management (DMM) was an effective method to solve the mobile address handover.Therefore,it was considered to be a technology that can be applied to satellite network mobility management.A distributed mobile management scheme which based on software definition network (SDN) was proposed to solve the traffic redirection problem in satellite network.Different from the traditional DMM application scenario which was network-based or terminal-based,the SDN-DMM scheme implements location management and address handover in SDN controllers.Therefore,SDN-based satellite network distributed mobile management scheme can realize packet forwarding path optimization compared with traditional scheme,and it shows significant advantages in managementcost and traffic management.     

The role of ISDN in data networking

The integrated services digital network (ISDN) offers on-demand switched end-to-end digital connectivity over the wide area, enabling the integration of both voice and data services over a common core network. This paper considers the role of ISDN in data networking, both as the core transport network and as a means of enhancing resilience in a mixed-technology data solution, complementing other data network technologies. The issues associated with data transport based on an ISDN solution are considered, and include security, bandwidth utilisation, scalability and the management of ISDN-attached devices. Optimising the use of ISDN networks for supporting the most prevalent routed and routeing protocols is also discussed.     

Photonic transport network OAM technologies

The optical path concept was proposed to realize ubiquitous B-ISDN. It can make quantum leaps in both transmission capacity and cross-connect throughput simultaneously by exploiting WDM (wavelength division multiplexing) transmission and the wavelength routing capabilities of paths. Since the optical path is a new concept, new operation and management (OAM) systems and related technologies need to be developed before it can be fully utilized. This article discusses some of the key OAM-related issues and identifies the technical points necessary for future developments. The issues include optical path realization technologies, optical path accommodation design problems, a newly proposed optical transport network layer architecture, and the optical transport module for the network node interface