A UAV-Assisted V2X Network Architecture with Separated Data Transmission and Network Control

With the explosive increasing number of connecting devices such as smart phones, vehicles,drones, and satellites in the wireless networks, how to manage and control such a huge number of networking nodes has become a great challenge. In this paper, we combine the advantages of centralized networks and distributed networks approaches for vehicular networks with the aid of Unmanned Aerial Vehicle(UAV), and propose a Center-controlled Multihop Wireless(CMW) networking scheme consisting of data transmission plane performed by vehicles and the network control plane implemented by the UAV.Besides, we jointly explore the advantages of Medium Access Control(MAC) protocols in the link layer and routing schemes in the network layer to facilitate the multi-hop data transmission for the ground vehicles.Particularly, the network control plane in the UAV can manage the whole network effectively via fully exploiting the acquired network topology information and traffic requests from each vehicle, and implements various kinds of control based on different traffic demands, which can enhance the networking flexibility and scalability significantly in vehicular networks.Simulation results validate the advantages of the proposed scheme compared with existing methods.

Study of Smart Grid Communication Network Architectures and Technologies

Smart Grid (SG) is an emerging paradigm of the modern world to upgrade and enhance the existing conventional electrical power infrastructure from generation to distribution to the consumers in a two-way communication fashion to automate the electrical power demand and supply and make this a cyber-physical system. SG infrastructure key elements, such as smart meters, circuit breakers, transformers, feeders, substations, control centers, grid stations, are required well-formed communication network architectures. SG infrastructure is divided into three main communication networks architectures, such as HAH, NAN, and WAN. Each of these communication network architectures requires reliable, stable, secure, high data rate at real-time with the help of different wireline and wireless communication technologies from HAN to WAN networks. To understand the complete concepts about SG, a concise review is presented and it will help the readers to get foundations of communication network architectures and technologies of SG.

Design of an Interconnection Architecture and Sizing of Two (2) EPC Core Networks: The Case of Orange-Guinea

With the arrival of the 4G and 5G,the telecommunications networks have experienced a large expansion of these networks.That enabled the integration of many services and adequate flow,thus enabling the operators to respond to the growing demand of users.This rapid evolution has given the operators to adapt,their methods to the new technologies that increase.This complexity becomes more important,when these networks include several technologies to access different from the heterogeneous network like in the 4G network.The dimensional new challenges tell the application and the considerable increase in demand for services and the compatibility with existing networks,the management of mobility intercellular of users and it offers a better quality of services.Thus,the proposed solution to meet these new requirements is the sizing of the EPC(Evolved Packet Core)core network to support the 5G access network.For the case of Orange Guinea,this involves setting up an architecture for interconnecting the core networks of Sonfonia and Camayenne.The objectives of our work are of two orders:(1)to propose these solutions and recommendations for the heart network EPC sizing and the deployment to be adopted;(2)supply and architectural interconnection in the heart network EPC and an existing heart network.In our work,the model of traffic in communication that we use to calculate the traffic generated with each technology has link in the network of the heart.

QoS-Guaranteed Secure Multicast Routing Protocol for Satellite IP Networks Using Hierarchical Architecture

Most recent satellite network research has focused on providing routing services without considering security. In this paper, for the sake of better global coverage, we introduce a novel triple-layered satellite network architecture including Geostationary Earth Orbit (GEO), Highly Elliptical Orbit (HEO), and Low Earth Orbit (LEO) satellite layers, which provides the near-global coverage with 24 hour uninterrupted over the areas varying from 75° S to 90° N. On the basis of the hierarchical architecture, we propose a QoS-guaranteed secure multicast routing protocol (QGSMRP) for satellite IP networks using the logical location concept to isolate the mobility of LEO and HEO satellites. In QGSMRP, we employ the asymmetric cryptography to secure the control messages via the pairwise key pre-distribution, and present a least cost tree (LCT) strategy to construct the multicast tree under the condition that the QoS constraints are guaranteed, aiming to minimize the tree cost. Simulation results show that the performance benefits of the proposed QGSMRP in terms of the end-to-end tree delay, the tree cost, and the failure ratio of multicasting connections by comparison with the conventional shortest path tree (SPT) strategy.

Cache-Assign-Forward Architecture for Efficient Communication in Hybrid Delay-Tolerant Networks

Delay-Tolerant Networks (DTNs) are wireless networks that often experience temporary, even long-duration partitioning. Current DTN researches mainly focus on pure delay-tolerant networks that are extreme environments within a limited application scope. It motivates the identification of a more reasonable and valuable DTN architecture, which can be applied in a wider range of environments to achieve interoperability between some networks suffering from frequent network partitioning, and other networks provided with stable and high speed Internet access. Such hybrid delay-tolerant networks have a lot of applications in real world. A novel and practical Cache-Assign-Forward (CAF) architecture is proposed as an appropriate approach to tie together such hybrid networks to achieve an efficient and flexible data communication. Based on CAF, we enhance the existing DTN routing protocols and apply them to complex hybrid delay-tolerant networks. Simulations show that CAF can improve DTN routing performance significantly in hybrid DTN environments.

Investigation of Architecture and Essential Technologies of Wireless Sensor Network

This paper introduces the architecture of wireless sensor networks, presents a cross-layer network management and control mechanism. The key technologies, such as Medium Access Control (MAC) and wireless routing protocols are discussed and compared. A proposal of applying the simple IEEE 802 MAC protocol into the wireless sensor network is introduced. In addition, in order to improve the system capacity, a multi-channel strategy for the sensor nodes is presented for decreasing the blocking probability and suppressing the accessing time delay. It is concluded that there are still a number of problems to be solved, including decreasing power consumption, improving capacity and avoiding access collision, to promote the successful commercial application of wireless sensor network.

Ultra-Dense Networking Architectures and Technologies for 5G

With the continuous enrichment of mobile communication application scenarios in the future, the traditional macro-cellular-based mobile communication network architecture will be difficult to meet the explosive growth in demand for communications services.

Research on the Trusted Energy-Saving Transmission of Data Center Network

According to the high operating costs and a large number of energy waste in the current data center network architectures, we propose a kind of trusted flow preemption scheduling combining the energy-saving routing mechanism based on typical data center network architecture. The mechanism can make the network flow in its exclusive network link bandwidth and transmission path, which can improve the link utilization and the use of the network energy efficiency. Meanwhile, we apply trusted computing to guarantee the high security, high performance and high fault-tolerant routing forwarding service, which helps improving the average completion time of network flow.

Exploring Content Popularity in Information-Centric Networks

Information-Centric Networking(ICN), an alternative architecture to the current Internet infrastructure, focuses on the distribution and retrieval of content by employing caches in a network to reduce network traffic. The employment of caches may be accomplished using graph-based and content-based criteria such as the position of a node in a network and content popularity. The contribution of this paper lies on the characterization of content popularity for on-path in-network caching. To this end, four dynamic approaches for identifying content popularity are evaluated via simulations. Content popularity may be determined per chunk or per object, calculated by the number of requests for a content against the sum of requests or the maximum number of requests. Based on the results, chunk-based approaches provide 23% more accurate content popularity calculations than object-based approaches. In addition, approaches that are based on the comparison of a content against the maximum number of requests have been shown to be more accurate than the alternatives.

Accelerating hybrid and compact neural networks targeting perception and control domains with coarse-grained dataflow reconfiguration

Driven by continuous scaling of nanoscale semiconductor technologies,the past years have witnessed the progressive advancement of machine learning techniques and applications.Recently,dedicated machine learning accelerators,especially for neural networks,have attracted the research interests of computer architects and VLSI designers.State-of-the-art accelerators increase performance by deploying a huge amount of processing elements,however still face the issue of degraded resource utilization across hybrid and non-standard algorithmic kernels.In this work,we exploit the properties of important neural network kernels for both perception and control to propose a reconfigurable dataflow processor,which adjusts the patterns of data flowing,functionalities of processing elements and on-chip storages according to network kernels.In contrast to stateof-the-art fine-grained data flowing techniques,the proposed coarse-grained dataflow reconfiguration approach enables extensive sharing of computing and storage resources.Three hybrid networks for MobileNet,deep reinforcement learning and sequence classification are constructed and analyzed with customized instruction sets and toolchain.A test chip has been designed and fabricated under UMC 65 nm CMOS technology,with the measured power consumption of 7.51 mW under 100 MHz frequency on a die size of 1.8×1.8 mm^2.

低轨巨型星座体系架构设计与关键技术分析

巨型星座中海量网元对现有网络架构和技术体制提出了严峻挑战,如何设计和规划网络体系架构是巨型星座发展的关键问题之一。从星座架构的概念与特征出发,结合国内外卫星星座发展情况与技术预判,提出“四面”(感知平面、数据平面、控制平面、智能管理平面)和“三层”(资源层、传送层、业务层)的多层多域混合式智能协同组网体系架构,设计星座网络管控架构、技术参考模型与协议架构等。同时,针对星座建设与发展趋势,阐述并分析星座网络编址路由、网络鲁棒性敏捷保障、差异化业务承载、端到端可靠传送等关键技术的演化趋势,支撑我国低轨巨型星座网络发展与建设。

卫星通信与5G融合的网络架构设计与优化

当前,卫星通信与5G技术应用日益广泛。文章深入探讨了二者间的融合发展情况及其在通信卫星、互联网卫星和5G网络架构设计中的应用,并进一步研究了融合中关键的体系架构优化、空口波形优化、频谱共享优化和网络控制优化等技术,以为促进我国卫星通信技术和5G技术的优化发展、提高整体通信领域的水平提供参考。

云计算智能嵌入式技术下光通信网络路由的研究

由于光通信传输带宽需求以及网络规模和复杂度不断增加,数据传输路径具有较多选择性,易导致路由能耗大、效率低。云计算平台可以提供海量的计算资源和存储空间,能够处理大规模的数据集,为此,基于云计算智能嵌入式技术研究一种光通信网络路由。利用嵌入式技术设计光通信网络的信号转换、编码、解码等功能,根据数据传输与网络节点的能耗特征建立网络路由能耗模型;引入蚁群算法,基于蚂蚁觅食原理找出所有可以实现数据传递的路由;采用遗传算法,通过选择、交叉、变异计算找出这些路由中数据传输最佳的路由,即能耗损失最小的路由。实验结果表明,所提技术能够提升数据传输速度,使丢包率在3.0%以下,且通信时延仅为23 ms,降低数据传送网络节点能量消耗,证实了所提方法的路由通信性能良好。

全维可定义网络5.0新型网络架构

【目的】面对万物智能互联时代的新兴产业向网络技术提出的确定性、安全性、管控能力等方面的需求,尽力而为、形式单一的IP网络难以同时提供网络质量、安全性、管理能力和效率的性能保障。新的历史阶段急需一个新的网络体系架构,在充分考虑网络广泛互联的基础上,更深度地关注网络空间安全和产业应用对网络的精细要求。【方法】本文提出了全维可定义网络5.0新型网络架构,采用“以网络为中心、能力内生、全维定义”的全新网络架构设计理念,提出了一套覆盖数据面、控制面、管理面和内生安全体系的新型核心协议体系,利用泛在IP、人工智能等技术进行高效的寻址、路由规划、可信管理等。【结果】通过这种架构,网络5.0将网络中的存储、计算资源和多等级转发能力进行高效整合,从而更好地满足应用需求,并实现网络的内生安全、确定性传输、算网融合、差异化服务等功能,显著降低了网络应用的复杂性,提高了网络效率和应用质量。【结论】全维可定义网络5.0促进了泛在场景应用的发展,使得网络从一个单纯的连接工具转变为一个功能丰富、服务多元、安全可靠的平台,并已成功实践和验证在多个应用领域中,成为新型网络架构主流发展路径之一。

智能网联汽车多域电子电气架构技术发展研究

智能网联作为汽车行业的重要发展趋势,是实现汽车行业新四化技术改革的关键性支撑技术。创新升级智能网联汽车操作系统核心技术,不但是落实国家战略要求,实现汽车制造强国目的,更是掌握自主研发核心技术,打破发达国家对我国技术封锁的重要途径。现阶段而言,随着汽车的智能化程度越高、功能越丰富,其对操作系统的要求也越来越高,多域电子电器架构技术的重要性愈发凸显。基于此,文章在智能网联汽车多域电子电器架构技术的基础上,对多域电子电器架构技术发展现状进行了分析,指出了当前我国智能网联汽车电子电器架构技术的优势,并对智能网联汽车电子电器架构技术发展趋势进行了探讨。

水声通信及网络技术综述

水声通信(UAC)及网络技术在海洋环境监测、商业领域和军事领域等诸多方面发挥着重要作用,关心海洋、认识海洋、经略海洋离不开水声通信及网络技术的发展。该文对水声通信技术和水声通信网络(UACN)进行综述,首先回顾了水声通信技术和水声通信网络的发展,总结了水声信道的特点。然后,对于水声通信技术中的非相干调制技术、相干调制技术以及以应用需求为导向的新型通信技术进行陈述。随后,对于水声通信网络中数据链路层媒介接入控制协议、网络层的路由协议和跨层设计进行分类探讨。最后,对目前水声通信及网络技术的不足进行总结,并且对未来水声通信及网络技术的发展进行展望。

一种基于自适应容错链路的片上网络设计与研究

随着芯片制程不断深入到亚微纳米级别,技术节点的持续缩小加速了片上网络中链路故障的发生。故障链路的增多降低了可用的路由路径数量,并可能导致严重的流量拥塞甚至系统崩溃。为了保证在遭遇故障链路时数据包的正常传输,该文提出一种基于自适应容错链路的片上网络设计(AFL_NoC),它能够将遭遇故障链路的数据包转发到另一条可逆链路上。该方案包括了可逆链路的具体实现以及相应的分布式控制协议。这种动态容错链路设计充分利用了网络中空闲的可用链路资源,确保了在遭遇链路故障的情况下网络通信不会中断。与先进的容错偏转路由算法QFCAR-W相比,AFL_NoC平均延迟降低10%,面积开销减少了14.2%,功耗开销减少了9.3%。

面向星地融合的5G网络增强及关键技术研究

卫星在覆盖范围、可靠性和灵活性等方面与地面5G网络具有融合互补的优势,尤其是低轨卫星和5G网络的融合已成为业界研究热点之一。重点面向星地融合领域介绍了5G网络增强架构及融合关键技术。首先,分析了星地融合领域发展趋势并列举重点应用场景;其次,介绍了5G网络增强架构,涉及基于透明转发卫星和基于可再生卫星的两种组网架构;最后,重点围绕星地融合通信业务需求分析了相关关键技术并进行了简要总结,为5G星地融合的应用落地提供有益参考。

5G和数字孪生下的工业光纤通信网络路由优化

为了提高工业光纤通信网络的路径优化效果和负载均衡能力,提出5G和数字孪生下的工业光纤通信网络路由优化方法,首先结合5G技术和数字孪生技术对工业光纤通信网络展开建模分析,获得网络状态数据;其次,将最小化最大链路利用率和路径时延作为目标,建立工业光纤通信网络路由优化目标函数;最后采用改进的麻雀算法对目标函数求解,实现工业光纤通信网络路由的优化。实验结果表明,所提方法的最大链路利用率在20%以内、路径时延最大值为0.27 s、死亡节点数量为全部节点的1/8,验证了所提方法具有良好的路径优化效果和负载均衡能力。

基于网络安全等级保护2.0的测评管理系统设计与实现

在传统的信息安全等级保护测评过程中,当测评人员完成测评工作后,由于人员水平参差,形成的最终报告往往差别较大。为了规范测评结果报告的生成,并方便测评人员对测评结果进行管理,该文基于网络安全等级保护2.0(等保2.0)国家标准要求,设计并实现信息安全等级保护测评管理系统。本系统具有创新性的多方参与管理体系,将用户根据身份的不同划分成不同的角色,不同身份级别的角色对系统中的测评结果拥有不同的查看或修改权限。系统基于B/S架构与MVC框架,利用PHP语言开发,并采用HTML、CSS、JavaScript等前端技术实现系统的可视化、动态化。