Core-based Shared Tree Multicast Routing Algorithms for LEO Satellite IP Networks

A new core-based shared tree algorithm, viz core-cluster combination-based shared tree （CCST） algorithm and the weighted version （i.e. w-CCST algorithm） are proposed in order to resolve the channel resources waste problem in typical source-based multicast routing algorithms in low earth orbit （LEO） satellite IP networks. The CCST algorithm includes the dynamic approximate center （DAC） core selection method and the core-cluster combination multicast route construction scheme. Without complicated onboard computation, the DAC method is uniquely developed for highly dynamic networks of periodical and regular movement. The core-cluster combination method takes core node as the initial core-cluster, and expands it stepwise to construct an entire multicast tree at the lowest tree cost by a shortest path scheme between the newly-generated core-cluster and surplus group members, which results in great bandwidth utilization. Moreover, the w-CCST algorithm is able to strike a balance between performance of tree cost and that of end-to-end propagation delay by adjusting the weighted factor to meet strict end-to-end delay requirements of some real-time multicast services at the expense of a slight increase in tree cost. Finally, performance comparison is conducted between the proposed algorithms and typical algorithms in LEO satellite IP networks. Simulation results show that the CCST algorithm significantly decreases the average tree cost against to the others, and also the average end-to-end propagation delay ofw-CCST algorithm is lower than that of the CCST algorithm.

Novel optimized routing algorithm for LEO satellite IP networks

A lot of routing algorithms have been proposed for low earth orbit（LEO） satellite IP networks in recent years,but most of them cannot achieve global optimization.The dynamic characters of LEO satellite networks are reflected in two aspects：topology and traffic change.The algorithms mentioned above are ＂hard routing＂ which only realize local optimization.A distributed soft routing algorithm combined with multi-agent system（MASSR） is proposed.In MASSR,mobile agents are used to gather routing information actively,and blackboard is introduced to achieve direct information exchange between agents.MASSR provides traffic adaptive routing and tracks the change of LEO satellite network topology.The performance of ant colony optimization（ACO） and MASSR are compared in Iridium constellation,and MASSR presents better end-to-end delay as well as enhanced robustness.

A FUZZY-LOGIC CONTROL ALGORITHM FOR ACTIVE QUEUE MANAGEMENT IN IP NETWORKS

Active Queue Management (AQM) is an active research area in the Internet community. Random Early Detection (RED) is a typical AQM algorithm, but it is known that it is difficult to configure its parameters and its average queue length is closely related to the load level. This paper proposes an effective fuzzy congestion control algorithm based on fuzzy logic which uses the pre- dominance of fuzzy logic to deal with uncertain events. The main advantage of this new congestion control algorithm is that it discards the packet dropping mechanism of RED, and calculates packet loss according to a preconfigured fuzzy logic by using the queue length and the buffer usage ratio. Theo- retical analysis and Network Simulator (NS) simulation results show that the proposed algorithm achieves more throughput and more stable queue length than traditional schemes. It really improves a router's ability in network congestion control in IP network.

Design and verification of a satellite-terrestrial integrated IP network model for the Global Energy Interconnection

In order to meet the pressing demand for wide-area communication required by the Global Energy Interconnection(GEI),accelerating the construction of satellite-terrestrial Integra怕d networks that can achieve network extension and seamless global coverage has become the focus of power communication tech no logy development.In this study,we propose a satellite-terrestrial integrated network model that can support interconnection and interoperation on the IP layer between the satellite system and the怕rrestrial segment of the existing power communication system.First,the composition and function of the satellite-terrestrial collaborative network are explained.Then,the IP-based protocol stack is described,and a typical applicati on experime nt is con ducted to illustrate the particular process of this protocol stack.Fin ally,a use case of IP interconn ection that depends on GEO satellite communication is detailed.The experime ntal study has showed that the satellite-terrestrial collaborative network can efficiently support various IP applications for the GEI.

A WIRELESS MULTIMEDIA TRANSMISSION CONTROL AlGORITHM OVER HETEROGENEOUS IP NETWORKS

In this paper,an algorithm Wireless Multimedia Transmission Control(WMTC) is proposed for multimedia transmission control over wired-wireless networks.The relationship between packet length and packet loss rate in the Gilbert wireless error model is investigated.Furthermore,the algorithm can detect the nature of packet losses by sending large and small packets alternately,and control the sending rate of nodes.In addition,by means of updating factor K,this algorithm can adapt to the changes of network states quickly.Compared with previous algorithms,simulation results show that WMTC can both improve the networks throughput of multimedia transmissions and reduce the congestion loss rate in various situations.

Research on the Method of Implementing Named Data Network Interconnection Based on IP Network

In order to extend the application scope of NDN and realize the transmission of different NDNs across IP networks,a method for interconnecting NDN networks distributed in different areas with IP networks is proposed.Firstly,the NDN data resource is located by means of the DNS mechanism,and the gateway IP address of the NDN network where the data resource is located is found.Then,the transmission between different NDNs across the IP network is implemented based on the tunnel technology.In addition,in order to achieve efficient and fast NDN data forwarding,we have added a small number of NDN service nodes in the IP network,and proposed an adaptive probabilistic forwarding strategy and a link cost function-based forwarding strategy to make NDN data obtaining the cache service provided by the NDN service node as much as possible.The results of analysis and simulation experiments show that,the interconnectionmethod of NDN across IP network proposed is generally effective and feasible,and the link cost function forwarding strategy is better than the adaptive probability forwarding strategy.

古典小说叙事志趣的复兴:网络文学与IP电影的“情”“志”表达

近年来,消费文化盛行,以短视频、博客段子等为代表的碎片化、娱乐化的视觉狂欢文化逐渐代替传统的文字、图像艺术成为中国社会典型的后现代文化症候。网络文学生成于这样的大环境之中,其作品改编IP电影也随着行业的鼎沸成为一股流行趋势。然而市场喧嚣之余,大量创作者却始终保有一定的“寄怀”思绪,通过对外“感物”和向内自醒的咏志抒情表达,有意或无意地成为传统叙事志趣与现代人文意识之间的桥梁,在传承与复苏中国叙事志趣传统的同时,为当代通俗文化与大众美学赋予更细腻的情感结构与更多的文化内涵。

IP承载网络技术演进方向研究

互联网业务的快速发展对IP承载网络提出了确定性、高可靠性、大带宽、弹性连接等新要求,而运营商业务本身的发展对IP承载网络提出了降本增效、差异化承载、安全可信的需求。基于业务演进对网络的需求、IP新技术的发展,对IP承载网络演进方向开展讨论,旨在打造高质量、差异化承载底座,满足多样化业务需求,提升网络价值,降低网络运营成本,筑牢网络安全底座,保障网络安全。

基于IP网络的视频会议可靠性评估方法

随着时代的发展,视频会议已经成为了日常办公的重要工具,视频会议为异地用户提供了一种不受空间制约的沟通手段,其能够提高工作效率,降低办公成本,因而在政府、医疗和军事的领域中也开始广泛运用。但是随着网络、高清技术的普及,视频会议的可靠性也面临严峻的挑战,因此需要建立一套系统运行的评估方法,从而定位系统运行可靠性的薄弱环节,并提出相应的改进方法。

数字电视信号在IP网络传输中的QoS保障技术应用

数字电视信号对传输质量有着十分严苛的要求,传统网际互连协议(Internet Protocol,IP)网络在提供端到端服务质量(Quality of Service,QoS)保障方面仍面临诸多挑战。对此,分析数字电视信号的业务特点和传输需求,梳理IP网络QoS领域的发展脉络,提出一种端到端QoS保障解决方案的总体架构,从接入网、骨干网、综合管理平台三个层面给出优化措施。

宽带卫星IP通信网络中数字调制解调技术研究

针对宽带卫星网络之间互连的协议(Internet Protocol,IP)通信网络解调过程中受到非线性通信信道影响,出现信道失真,导致通信信道误码率高的问题,提出宽带卫星IP通信网络中数字调制解调技术。利用I/Q偏压进行数字式调制,避免正交型时引起的信道间干扰。通过星座图调制信号,使其满足恒包络特性,获取星座图向量。求解调制码元中各位元的对数似然比,利用基于通道特征的解调方法,解调振幅畸变和相位畸变的星座图。根据获取的星座图星座点坐标,构建通信信道参数估计模型。使用最小二乘法估计信道参数向量修正的星座图并进行解调,使用四相移相键控解调差分检测方式修正信号幅频,达到更平稳的通信效果。由解调性能实验分析结果可知,该技术能够使解调曲线趋于一条直线,达到频域均衡的目的,且误码率最小为10-5 B,可实现通信网络的高效准确解调。

省域广电IP骨干网的“IPv6+”技术应用与演进探索

面对广电IP数据网固移融合、云网协同和多业务融合承载的发展趋势,本文提出了省域广电IP骨干网建设发展的目标架构和组网设计、路由组织、业务承载等建设内容,借助SRv6原生隧道实现了IPv6单栈部署,通过SRv6 TE policy+FlexE提供业务差异化承载,引入SDN控制器和Telemetry、iFIT技术大幅提升全程全网运维管理和服务保障能力。

基于IP网络的企业语音通信系统构建研究

IP网络的语音通信系统日益成为现代通信领域的重要研究方向。本文详细介绍了IP网络通信的基本原理和技术,包括通信协议、编解码器、网络带宽管理等关键要素;重点探讨了安全性和隐私保护、通信成本降低的重要性,并提出相应解决方案,强调了用户界面和用户体验的优化,及系统集成和测试的重要性。文章旨在深入探讨这一领域的关键问题和挑战,并提出构建高效、安全和可靠的IP语音通信系统策略方法。

IP网络架构下无压缩4K视频码流的PTP同步信号解析

随着网络技术的发展,数据码流传输模式逐步由SDI架构过渡至IP化架构,简化了网络结构,提升了传输效率,但同时对发射端和接收端的同步问题提出了更高要求。本文针对IP网络架构下无压缩4K视频码流的同步问题,基于PTP协议对同步信号和RTP信号进行解析,进一步理清RTP和PTP协议协同工作时视频码流时钟与源时钟的同步关系。

基于IP技术的配电网自动化系统故障定位方法

文章针对配电网规模较大,配电网结构复杂,提出了一种基于网际互连协议(Internet Protocol,IP)技术的配电网自动化系统故障定位方法。该方法通过高效的数据采集与传输、数据预处理、故障检测与定位以及故障响应与恢复,快速准确定位配电网故障点。实验结果表明,设计方法具有较高的故障检测准确率和较低的定位误差,验证了其在实际工程应用中的有效性。

全IP化制播网络的关键技术及应用策略

分析全网际互连协议(Internet Protocol,IP)化制播网络的关键技术,涉及IP化技术架构、虚拟化与云化技术、人工智能(Artificial Intelligence,AI)在制播中的应用以及AI架构的网络智能化管理。探讨该网络面临的数据安全、实时性、技术更新及多源数据整合等挑战,并提出相应的解决方案,包括利用区块链增强数据安全、通过低延迟协议提升实时性、制定开放技术标准以及利用AI整合多源数据,旨在为全IP化制播网络的发展提供理论与实践指导,推动广播电视技术的创新与进步。

IP承载网中QOS策略的设计与优化

在网络世界中,网际互连协议(Internet Protocol,IP)承载网扮演着信息流动的骨干角色,其运行表现和服务水准至关重要。文章详细探讨了IP承载网中服务质量(Quality of Service,QoS)策略的设计与优化方法,重点涵盖分类服务与标记、流量控制与优先级队列管理以及链路和节点策略的具体实现。通过流量分析与预测、智能资源分配与调度、动态策略调整以及故障检测与容错机制,提出一系列提升网络性能和用户体验的有效措施。

一种基于KVM OVER IP的通信专业智能化集中运维方式

随着运营线路的增多,郑州地铁已进入网络化运营的新阶段,对设备的日常维护也提出了更高的要求,通信专业设备众多,更需要通过智能运维来满足网络化运营的新要求。本文基于车站、控制中心的通信设备的维护现状,通过研究通信专业智能化集中运维方式,优化日常运维场景、故障处理场景、抢险抢修场景下人员分工和生产方式,提出新的基于KVM OVER IP的设备管理架构和运维模式,在不影响现网正常稳定运行、投资成本不高的情况下,实现地铁通信专业设备的集中化、智能化维护,进一步提升设备管理维护水平,同时为下一步建设网管网奠定基石,最终可轻松实现业务、管理2张网运行,结合大数据技术亦可实现地铁通信设备的智能监测、智能分析、智能维护,最大化的增加经济效益。

基于网络攻击告警的IP地址自动化封禁应用

随着国内外网络信息技术的发展和普及,网络安全问题逐步增多。外部恶意IP地址在未授权情况下进行各种恶意行为,如DDoS、安全漏洞、数据窃取、勒索病毒、木马后门攻击等,导致数据泄露、服务不可用等安全问题频发。基于此,自动化封禁IP地址技术应运而生,可以快速封禁外部发起的恶意攻击IP地址,及时阻止攻击者的进一步网络攻击行为,有效提升网络安全性能。文章通过介绍基于网络攻击告警的IP地址自动化封禁技术的实现原理和实际运营场景,验证了该技术的可行性和在网络安全防御方面的实用价值。

深度学习在恶意IP识别中的应用

为了加强网络安全防御能力,可以应用深度学习技术来提高对恶意IP的识别准确率。本文介绍了如何应用深度学习中的前馈神经网络来构建恶意IP识别模型。实证分析的结果显示,基于深度学习技术的恶意IP识别模型表现出了更高的准确率和实时性,为网络安全领域提供了一种有效的恶意IP识别解决方案。