Towards a framework for high-speed communication in a heterogeneousnetworking environment

The issues that are specific to heterogeneous networks are addressed. Some background on both the current ARPA internet model and high-speed packet switching is provided. This discussion includes: the internet components; the internet protocol hierarchy, popularly known as the transmission control protocol/internet protocol (TCP/IP) protocol suite; and the internet strengths and weaknesses. The major elements of an extended internet model that allows internetworking of new high-speed packet networks with a wide range of other networks, including current data networks and national telephone networks, are outlined. Some end-to-end and host interface issues are examined     

The Optimization of Combination Scheme in Cooperative Spectrum Sensing Based on the Practical Reporting Frame Format

Wireless mesh networks (WMNs) are emerged as prominent solution to provide seamless connection to the internet. WMNs are typically used for providing broadband wireless internet access to a large number of users and networks. Guaranteeing the quality of service to end users with efficient resource utilization is a challenging issue in WMNs. To accomplish this, we propose a hybrid routing protocol for wireless mesh networks. It is a combination of intra cluster routing protocol (ICR) and inter cluster routing protocol for mesh networks (ICMR). Intra cluster routing protocol is intended to facilitate the communication between mesh clients within a same cluster and inter cluster routing protocol (ICMR) intended to facilitate the communication for mesh clients from different clusters. Intra cluster routing protocol is a proactive type of routing protocol and inter cluster routing protocol is a reactive type of routing protocol. The performance of the proposed protocol is analyzed and the results shown superior performance compared to baseline routing protocols in terms of throughput, end to end delay, packet delivery ratio and jitter.     

Locating internet gateways to minimize nonlinear congestion costs

We investigate the impact of the locations of the gateways on the performance of the internet. We consider the problem of determining (i) the routing assignments for the intranet and internet traffic and (ii) the number of gateways and their locations to interconnect existing data networks to minimize a linear combination of the average internet and intranet packet delays subject to a cost constraint on the amount to be spent to establish the gateways. This joint routing and topological design problem is important in the design of internets and should be solved before networks are actually interconnected. This problem is formulated as a nonlinear combinatorial optimization problem. When the gateway locations are fixed, the resulting routing problem is not a convex programming problem. This is unexpected since the routing problem in datagram networks is usually formulated as a convex program. We develop an algorithm based upon Lagrangian relaxation to solve this problem. In the computational experiments, the algorithm was shown to be effective in interconnecting (i) two WANs and (ii) two grid networks. The experiments also showed that the algorithm finds better feasible solutions than an exchange heuristic     

A scheme for high-performance LAN interconnection across publicMAN's

The proliferation of local area networks (LANs) and the emergence of high-bandwidth public networks will create an environment in which it will become increasingly simple and attractive to communicate among different organizations across a common public networking infrastructure. The open bridging scheme proposed, which employs inherent features of forthcoming cell-based metropolitan area networks (MANs) in order to achieve efficient interenterprise communications is introduced. It uses enhanced remote LAN bridging techniques to ensure router-level functionality with bridge-level simplicity and performance. The practicality of open bridging is shown by describing how it can be incorporated in networks using current standard protocol stacks, such as open systems interconnnection (OSI) and transmission control protocol/internet protocol (TCP/IP)     

Robust security framework for DVB‐RCS satellite networks (RSSN)

Satellites represent a solution for Internet access in locations with no other telecom infrastructures, for example, on high mobility platforms such as planes, ships or high‐speed trains, or for disaster recovery applications. However, due to peculiar characteristics, satellite networks are prone to different security threats. In this paper, we introduce a novel, robust security architecture for securing digital video broadcasting‐return channel via satellite satellite networks, inspired by the robust security mechanism available in the Institute of Electrical and Electronic Engineers (IEEE) 802.11i wireless local area network. We propose an efficient authentication and key management mechanism, which is exploited through three round‐trips only, demonstrating that it is as secure as IEEE 802.11i. Furthermore, the simulation results show that the proposed security framework needs a very small data overhead and shows better performance than internet protocol security (IPSec), which is commonly used as an end‐to‐end security solution over internet protocol satellite networks. Copyright © 2015 John Wiley & Sons, Ltd.     

Examination of the applicability of router and bridging techniques

Bridges are compared to routers from a number of perspectives. Routers are systems that interconnect networks based on information contained in layer 3, the networking layer, of the Open Systems Interconnection (OSI) model. Bridges use layer 2 (data link layer) information to determine whether packets should be passed from one network to another. This type of interconnection strategy use node address data only and thus is independent of the protocol used for OSI layer 3 and above. Processing requirements of bridges and routers are compared, highlighting the more complex processing needs of the latter. The greater functionality and flexibility of routing, which accompanies this increased complexity, is discussed. In particular, the focus is on the ability of routers to interconnect different local area network techniques, deal with heavy traffic, and control topology     

数据中心光通信技术

由于互联网业务的快速发展,数据中心的流量已经占据全球通信网络流量绝大部分。作为高速信息传输的主要载体,如今光通信技术已经在数据中心中得到了广泛应用,从距离几米服务器间的光互连到连接世界各地数据中心的光网络。概要介绍了数据中心的光通信技术,包括数据中心之间互连的广域网、城域网技术和数据中心内部服务器及交换机之间光互连技术,并对各个领域内一些不同的技术方案做了简要的讨论和比较。     

Management of distributed measurement over interconnected networks

A model is described for managing stand-alone network measurement devices distributed over an interconnected network (i.e. a network of networks, or internet). A host anywhere on the internet can act as a controlling device that manages a scattered set of measurement monitors. A protocol based on this model and the service it provides are discussed. The protocol fits in the application layer of the OSI model     

A Multichip Pulse-Based Neuromorphic Infrastructure and Its Application to a Model of Orientation Selectivity

The growing interest in pulse-mode processing by neural networks is encouraging the development of hardware implementations of massively parallel networks of integrate-and-fire neurons distributed over multiple chips. Address-event representation (AER) has long been considered a convenient transmission protocol for spike based neuromorphic devices. One missing, long-needed feature of AER-based systems is the ability to acquire data from complex neuromorphic systems and to stimulate them using suitable data. We have implemented a general-purpose solution in the form of a peripheral component interconnect (PCI) board (the PCI-AER board) supported by software. We describe the main characteristics of the PCI-AER board, and of the related supporting software. To show the functionality of the PCI-AER infrastructure we demonstrate a reconfigurable multichip neuromorphic system for feature selectivity which models orientation tuning properties of cortical neurons     

Telecommunications management network (TMN) architecture andinterworking designs

The authors discuss data communications networks (DCNs) used by operating telephone companies to interconnect large numbers of telecommunications network elements with operations systems and workstations to support and manage telecommunications networks, referred to by the international telegraph and telephone consultative committee (CCITT) as a telecommunications management network (TMN). The TMNs can include different types of DCNs such as private lines, circuit-switched networks, packet-switched networks, and integrated services digital networks (ISDNs). These can be divided into two classes: connection-mode and connectionless-mode networks. The authors briefly consider TMN concepts and implementation architectures. They then focus on TMN internetworking design alternatives, issues, and protocol stacks, in order to provide data network designers and implementors with the necessary fundamentals in considering and choosing interworking solutions for TMN applications     

BOIN:一种新型无缓存高性能计算机光互连网络

 现有的高性能计算机光互连网络大都需要对数据报文进行光-电-光转换并缓存,或者需要预先申请并建立从源节点到目的节点的光链路,这在一定程度上限制了网络性能.提出了一种既不需要对光数据报文进行缓存排队,也不需要预先申请并建立光链路的新型的光互连网络结构BOIN.给出了BOIN网络上的无死锁和无活锁路由算法,推导出BOIN网络中数据传输的延时上界,并通过模拟实验对比了BOIN网络与其它两种典型的网络的性能.实验结果表明,BOIN光互连网络具有良好的延时和吞吐率特性,能够很好地满足高性能计算机系统的要求.     

面向智能工业物联的灵活地址可信协议架构

IP网络在过去50年里取得了瞩目成绩,已经成为人们生产和生活过程中不可或缺的一部分。然而,随着互联网的广泛应用,IP协议体系的一些原始设计缺陷也日益暴露,难以满足未来网络的发展需求。讨论了面向2030年的互联网业务场景和关键技术挑战,提出了面向智能工业物联的灵活地址可信协议架构。新协议架构在传统IP协议全球可达、高生存性的基础之上,构建万物万网互联、确定性服务、内生安全可信、高通量传输和用户可定义等新能力,并基于这些新能力使能更多新型网络业务。     

IP router architectures: an overview

In the emerging environment of high performance IP networks, it is expected that local and campus area backbones, enterprise networks, and internet service providers (ISPs) will use multigigabit and terabit networking technologies where IP routers will be used not only to interconnect backbone segments but also to act as points of attachments to high performance wide area links. Special attention must be given to new powerful architectures for routers in order to play that demanding role. In this paper, we identify important trends in router design and outline some design issues facing the next generation of routers. It is also observed that the achievement of high throughput IP routers is possible if the critical tasks are identified and special purpose modules are properly tailored to perform them. Copyright © 2001 John Wiley & Sons, Ltd.     

以太网技术在基于同轴电缆的多住户单元中的应用

利用调制解调技术将以太网信号合成在同轴电缆中和CATV信号一同传输,实现包括视频点播（VOD）、网络电视（IPTV）、宽带上网及数字音频（VOIP）等能够承载多种业务的双向宽带网络功能。     

Practical Routing in Delay-Tolerant Networks

Delay-tolerant networks (DTNs) have the potential to interconnect devices in regions that current networking technology cannot reach. To realize the DTN vision, routes must be found over multiple unreliable, intermittently-connected hops. In this paper we present a practical routing protocol that uses only observed information about the network. We designed a metric that estimates the average waiting time for each potential next hop. This learned topology information is distributed using a link-state routing protocol, where the link-state packets are "flooded" using epidemic routing. The routing is recomputed each time connections are established, allowing messages to take advantage of unpredictable contacts. A message is forwarded if the topology suggests that the connected node is "closer" to the destination than the current node. We demonstrate through simulation that our protocol provides performance similar to that of schemes that have global knowledge of the network topology, yet without requiring that knowledge. Further, it requires significantly less resources than the alternative, epidemic routing, suggesting that our approach scales better with the number of messages in the network. This performance is achieved with minimal protocol overhead for networks of approximately 100 nodes.     

The design, implementation, and performance evaluation of theon-demand multicast routing protocol in multihop wireless networks

Multicasting has emerged as one of the most focused areas in the field of networking. As the technology and popularity of the Internet grow, applications such as video conferencing that require the multicast feature are becoming more widespread. Another interesting development has been the emergence of dynamically reconfigurable wireless ad hoc networks to interconnect mobile users for applications ranging from disaster recovery to distributed collaborative computing. In this article we describe the on-demand multicast routing protocol for mobile ad hoc networks. ODMRP is a mesh-based, rather than conventional tree-based, multicast scheme and uses a forwarding group concept (only a subset of nodes forwards the multicast packets packets via scoped flooding). It applies on-demand procedures to dynamically build routes and maintain multicast group membership. We also describe our implementation of the protocol in a real laptop testbed     

基于RMTP协议的无线电监测台站互连技术研究

当前我国各地均建设了一定数量的无线电监测台站和监测网,但不同厂家集成的监测系统之间无法互连互通,严重制约了监测台站的效能发挥。通过适配RMTP协议,不同的无线电监测台站可以相互连接,从而实现联合监测和数据共享。     

基于ZigBee和CDMA的温室远程测控系统的设计

针对农业数据远程测控的实际需求,本文进行了基于ZigBee协议和CDMA通信技术的温室远程测控系统的设计开发。以支持ZigBee协议的芯片CC2520来构建传感器节点和汇聚节点,以CDMA无线通信模块构建能与INTERNET进行数据连接的网关。传感器节点采用星型拓扑结构组成无线传感器网络后,采集数据并将测量数据发送给汇聚节点,再由汇聚节点发送刮网关,最后网关将数据通过互联网远程传输至测控中心。该测控系统能耗少,组网灵活,安装维护便捷,适合大规模温室的远程无线实时测控。     

面向5G/B5G的智能云化网络架构

5G/B5G技术的出现使移动网络的带宽、时延、连接等关键能力得到了极大的提升。面对移动接入侧能力的飞速发展,现有的集中式互联网云服务架构容易出现瓶颈,无法充分发挥 5G/B5G 的性能优势。网络5.0技术的提出,旨在通过一套完整的创新协议体系及控制管理架构,应对未来典型网络应用对数据网络的需求。基于网络5.0协议体系,提出一种新型的智能云化网络,通过云网深度融合,弥补互联网服务模型与5G/B5G接入能力之间的差距,推动网络持续演进发展。     

Transition and coexistence strategies for TCP/IP to OSI

The US DoD (Department of Defense) Internet suite of protocols (commonly known as TCP/IP for transmission control protocol/internet protocol) is the de facto open (nonproprietary) standard for computer communications in multivendor and multiadministration networks. However, some feel that protocols based on the open systems interconnection (OSI) model and promulgated by the International Organization for Standardization (ISO) will eventually achieve dominance and enjoy even greater success than TCP/IP. The author explores methods for transition and coexistence between the two protocol suites. He enumerates several approaches, discusses the positive and negative aspects of each, and describes their inter-relationships. Further, although the focus is on the problems of Internet/OSI transition and coexistence, none of the approaches described are unique to this problem. Rather, they are all general solutions to the problem of changing from one protocol suite to another or of having two arbitrary protocol suites coexisting