Internet域间路由系统：问题与挑战

作为Internet的核心基础设施,基于BGP协议的域问路由系统目前在扩展性、端到端性能、安全性与可信性等方面存在问题。由于部署的厂域性、AS的自治性以及ISP之间交互的复杂性、域间路由行为的动态性,使得人们对域间路由系统的结构和行为规律尚未充分理解,缺乏全面有效的解决方案,大规模的系统的网络实验难以开展。理想的域问路由系统及其支撑的Internet在性能上应具有快速恢复和全局优化的能力,在安全上应具有自主防范和协同控制能力,在运营上应具有自主配置和协同管理能力。     

VANET中基于跨层路由设计的协作通信研究

研究了无线车载Ad-hoc网络(VANET)中基于跨层路由设计的协作通信性能,首先构建了跨层协作通信系统模型,针对两种不同的性能要求,推导出所研究的跨层优化问题的目标函数公式,并作为协作通信路径决策的数量标准。仿真分析结果表明车辆间的协作通信模式可以显著降低无线链路开销,降低通信中断概率,提高车载网络的性能。     

模糊QoS路由算法及其性能分析

我们将模糊理论引入QoS路由领域中,提出了模糊QoS路由算法,在只增加相对较少的计算开销的基础上,有效地提高了QoS路由在离网络负载下的路由成功率和对链路信息滞后性的适应性。     

车联网中基于Q学习的地理位置路由协议

由于道路拓扑结构的限制以及车辆节点的快速变化,车联网路由协议正面临着很多挑战,例如道路的低连通性、较大的延时以及高开销等。为解决此类问题,提出了一种基于Q学习的地理位置路由协议。该协议将地理区域划分成大小一致的正方形,称为网格。在给定目的地的情况下,根据历史交通流信息计算出车辆从当前网格向不同方向的邻居网格移动的Q值,每辆车存储Q值表,通过查询Q值表选择最优下一跳网格。在选定的下一跳网格中,选择距离目的地最近的车辆,当最优下一跳网格中没有邻居车辆时,选择次优下一跳网格中的车辆。仿真结果表明,与其他基于地理位置的路由协议相比,所提协议能够提高分组投递率,降低传输延时并减少通信跳数。     

无线Mesh网络跨层路由技术研究

无线Mesh网络(WMN:wireless mesh networks)作为一种新型的无线网络,成为近几年研究的热点。由于无线信道不稳定等特性,如何设计WMN的路由协议成为决定其性能的关键因素之一。近几年来的研究表明,通过跨层设计的方式综合其他层的重要参数来实现路由选择,能够很好地解决这一难题。介绍了几种先进的跨层路由设计方案,总结了现有的跨层路由协议的优缺点,并对如何设计并实现跨层路由协议进行了分析和总结。     

MADCR:Mobility Aware Dynamic Clustering-Based Routing Protocol in Internet of Vehicles

Internet of Vehicles (IoV) is an evolution of the Internet of Things (IoT) to improve the capabil-ities of vehicular ad-hoc networks (VANETs) in in-telligence t...     

Cross-Layer Design Based Optimized Link State Routing Protocol for Wireless Mesh Networks

A proactive routing protocol CL-OLSR (cross-layer based optimized link state routing) by using a brand-new routing metric CLM (cross-layer metric) is proposed. CL-OLSR takes into account four link quality impact factors in route calculation through the cross-layer operation mechanism: the node available bandwidth, the node load, the link delivery rate, and the link interference, and thus the effect of route selection is optimized greatly. The simulation results show that the proposed CL-OLSR protocol can not only improve the network throughput to a large extent, but also reduce the end-to-end delay, while achieving load balance route results.     

Cross-Layer Design and Ant-Colony Optimization Based Routing Algorithm for Low Earth Orbit Satellite Networks

To improve the robustness of the Low Earth Orbit （LEO） satellites networks and realise load balancing, a Cross-layer design and Ant-colony optimization based Load-balancing routing algorithm for LEO Satellite Networks （CAL-LSN） is proposed in this paper. In CAL- LSN, mobile agents are used to gather routing information actively. CAL-LSN can utilise the information of the physical layer to make routing decision during the route construction phase. In order to achieve load balancing, CAL- LSN makes use of a multi-objective optimization model. Meanwhile, how to take the value of some key parameters is discussed while designing the algorithm so as to improve the reliability. The performance is measured by the packet delivery rate, the end-to-end delay, the link utilization and delay jitter. Simulation res- ults show that CAL-LSN performs well in bal- ancing traffic load and increasing the packet delivery rate. Meanwhile, the end-to-end delay and delay jitter performance can meet the re- quirement of video transmission.     

多媒体异构Mesh网络体系设计及跨层QoS路由算法研究

 针对无线Mesh网络的异构特性和多媒体业务的QoS要求,研究了一种跨域、跨层、跨节点的无线Mesh网络QoS自适应体系架构.在此基础上,利用双层规划数学模型描述之,并利用改进的蚁群算法来求解该双层规划模型,从而提出了基于双层规划模型的蚁群优化路由算法.仿真结果表明双层规划数学模型充分地考虑并优化了路径的各QoS指标,提出的蚁群优化路由算法能够很好地收敛于双层规划模型的最优解,且具有复杂度低、收敛速度快的特点.     

Cross-Layer Design Based N-ary Huffman Coding for Performance Analysis of DSDV Routing Protocol in MANETs

Wireless Personal Communications - The implementation of the optimal Huffman coding technique for achieving proficient data compression, lower information redundancy and minimal utilization of the...     

Cross-Layer Rate Control, Routing and Scheduling Design for Multicast with Network Coding in Ad Hoc Networks

Network coding is a powerful coding technique that has been proved to be very effective in achieving the maximum multicast capacity. It is especially suited for new emerging networks such as ad-hoc and sensor networks. In this paper, we develop a distributed rate control algorithm for multicast session in ad hoc networks. With random network coding, the algorithm can be implemented in a distributed manner, and work at transport layer to adjust source rates and at network layer to carry out network coding. The scheduling element of our algorithm is a dynamic scheduling policy. The stability of the resulted system is established, and simulation results are provided to support our conclusions.     

卫星通信网络中的跨层设计

随着通信技术的发展，各种多媒体应用被引入到无线和卫星网络，然而由于无线及卫星网络的信道特性并不理想，传统的分层设计方法对于无线环境来说有相当大的局限性，因此近年来另外一个设计方法——跨层设计成为了一个研究热点．本文首先简单介绍了跨层设计方法的背景、思路，之后论述了该方法在卫星通信网络中的应用，最后分析讨论了跨层设计的特点、代价和折衷．     

Ad hoc 网路由协议设计及性能评估问题

Adhoc网是由多个节点为了某种特定目的彼此连接的无线网络。本文首先对Adhoc网的特性、近期的发展及应用做了简要介绍,随后着重小结了目前其路由协议的设计思路,最后指出了在进行协议性能测定时应注意的问题并简要介绍了广泛应用的仿真平台。     

因特网路由选择技术

路由技术是因特网实现世界范围的连通性的关键技术之一.从不同角度及应用环境介绍了路由问题,综述了相关的最新研究成果,以期对因特网路由技术问题的现在和将来的研究提供必要的背景知识.     

基于软件定义基础设施的“互联网+”开放平台架构设计

"互联网+"背景下传统产业的升级需要IT基础架构的支撑。软件定义基础设施(SDI)通过软件来管理、调配和运行数据中心,涵盖计算、存储和网络三大部分,可提供更快响应速度和更高可用性来满足企业的需求。文章首先论述软件定义基础设施资源管理平台的设计和实现,在此基础上提出基于软件定义基础设施的"互联网+"开放平台,阐述了业务编排、大数据分析、自动化运维等开放平台核心模块的设计方案,最后提出该平台在工业互联网及车联网的应用前景和发展方向。     

Adaptive Cross-Layer Routing Protocol for Optimizing Energy Harvesting Time in WSN

Wireless Personal Communications - Trade-off between energy conservation and efficiency is one of the most important issues in designing Wireless Sensor Network (WSN) based applications. Network...     

一种基于跨层设计和蚁群优化的自组网负载均衡路由协议

针对大部分现有替代路径共同存在的替代路径老化和构建效率问题,本文提出了一种基于跨层设计和蚁群优化的负载均衡路由协议(CALRA),利用蚁群优化算法特有的信息素挥发方法实现对替代路径的老化问题,将蚁群优化和跨层优化方法结合起来解决自组网中的负载均衡问题,通过双向逐跳更新的方式较好的解决了替代路径构建效率问题,并将蚂蚁在所经过的各中间节点为路由表带来的信息素增量映射为蚂蚁离开源节点的距离、移动过程中所遇到的节点拥塞程度、节点当前信息素浓度和节点移动速度等各协议层的统计信息的函数,通过对各种信息所对应的参数赋予不同加权值的方法对概率路由表进行控制,改善了自组网中现有基于蚁群优化的路由协议中普遍存在的拥塞问题、捷径问题、收敛速度问题和引入的路由开销问题.仿真表明,CALRA在分组成功递交率、路由开销、端到端平均时延等方面具有优良性能,能很好地实现网络中的业务负载均衡.     

Cross-Layer Interaction of TCP and Ad Hoc Routing Protocols in Multihop IEEE 802.11 Networks

In this research, we first investigate the cross-layer interaction between TCP and routing protocols in the IEEE 802.11 ad hoc network. On-demand ad hoc routing protocols respond to network events such as channel noise, mobility, and congestion in the same manner, which, in association with TCP, deteriorates the quality of an existing end-to-end connection. The poor end-to-end connectivity deteriorates TCP's performance in turn. Based on the well-known TCP-friendly equation, we conduct a quantitative study on the TCP operation range using static routing and long-lived TCP flows and show that the additive-increase, multiplicative-decrease (AIMD) behavior of the TCP window mechanism is aggressive for a typical multihop IEEE 802.11 network with a low-bandwidth-delay product. Then, to address these problems, we propose two complementary mechanisms, that is, the TCP fractional window increment (FeW) scheme and the Route-failure notification using BUIk-losS Trigger (ROBUST) policy. The TCP FeW scheme is a preventive solution used to reduce the congestion-driven wireless link loss. The ROBUST policy is a corrective solution that enables on-demand routing protocols to suppress overreactions induced by the aggressive TCP behavior. It is shown by computer simulation that these two mechanisms result in a significant improvement of TCP throughput without modifying the basic TCP window or the wireless MAC mechanisms.     

A Study on Various Technologies to Solve the Routing Problem in Internet of Vehicles (IoV)

Wireless Personal Communications - Internet of Vehicles (IoV) can be pivotal factor towards realization of Intelligent Transportation Systems. IoV principle focus is to have time decisive safety...