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Search Results: 1 - 10 of 8986 matches for " NS-2仿真 "
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基于ns-2的卫星网络仿真方法的研究
叶晓国,肖甫,孙力娟,王汝传
南京邮电大学学报(自然科学版) , 2009,
Abstract: 网络仿真器ns2在卫星网络研究中得到越来越多的应用,但ns2中基本的卫星网络仿真模块难以满足实际复杂场景的仿真要求。在分析卫星网络仿真原理的基础上,提出了一种卫星网络仿真模块的扩展方法。该方法深入ns2仿真器内核,用c++语言设计了新型空间通信结点、链路以及空间几何特性仿真模块,用tcl/tk语言设计了新型空间通信结点的仿真配置接口。仿真实验表明,对卫星网络结点和链路仿真模块的扩展方法是可行的和有效的。
自组网中基于多信道的功率控制技术
付瑞雪 李东生 向勇?
计算机科学 , 2008,
Abstract: 自组网介质访问控制协议是影响自组网性能的重要因素。形式化地描述并分析了结合多信道和功率控制技术的自组网mac协议性能特征。ns-2仿真实验表明,与没有功率控制的aodv相比较,在功率控制技术中合理的引入多信道技术,可有效的降低功率控制所引发的碰撞增加问题,增加节点和网络的生存时间。
QoS Bandwidth Estimation Scheme for Delay Sensitive Applications in MANETs  [PDF]
Surjeet  , Arun Parkash, Rajeev Tripathi
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.51001
Abstract:

For last few years, MobileAd hoc Networks (MANETs) have attracted a great interest in case of wireless and multimedia technologies. Infrastructure less nature of MANETs makes Quality of Service (QoS) provisioning very challenging and important research aspect. To find a QoS constrained route from source to destination, we should be able to effectively determine the available resources throughout the route. The routing protocol is the most integral part of any type of QoS provisioning. It has to decide which route is able to fulfill the requirement of the desired QoS for specified application. In this paper, modification has been proposed in the existing MANET protocols to get the information about total path bandwidth for delay sensitive applications. It uses modified technique for bandwidth estimation and for route maintenance. The proposed protocol is implemented and simulated using NS-2 simulator. Results of our implementation show that there is much improvement in overheads without any impact on overall end-to-end throughput.


Bandwidth Constrained Priority-Based Routing Algorithm for Mobile Ad Hoc Networks  [PDF]
  Surjeet, Arun Parkash, Rajeev Tripathi
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2014, DOI: 10.4236/ijcns.2014.75016
Abstract:

A Mobile Ad hoc NETwork (MANET) is a dynamically formed self-configured network by an autonomous system of mobile nodes connected by wireless links. With the advancements of wireless technology, the necessity of Quality of Service (QoS) is increasing rapidly. Developing QoS constraint routing protocol for MANETs is still a challenging task. As the nodes are free to move randomly, most routing protocols for MANETs are susceptible to node mobility. As routing protocol has to decide which route is able to fulfill the requirement of the desired QoS, routing is the most important part to accomplish the specified application with desired QoS metrics. This paper is based on design of such a kind of proposed MANET algorithm that will estimate the available bandwidth throughout the path by assigning priority. Based on available bandwidth, packets are transferred from source to destination of the applications in queue based on priority. The proposed algorithm is implemented and simulated using NS-2 simulator. Results of our approach show that new protocol can significantly reduce overheads and decrease overall end-to-end delay.

Implementation of an Ad Hoc Network Protocol E-OAODV Improving the Performance of TCP
一种提高TCP性能的移动自组网E-OAODV协议的实现

WU Chun-xue,YANG Chao-liang,
邬春学
,杨朝梁

计算机科学 , 2009,
Abstract: In order to improve the performance of TCP used in Ad Hoc networks,an enhanced routing protocol based on AODV was presented,which is called E-OAODV(Enhanced Optimal Ad Hoc On-demand Distant Vector)in this paper.By using routing information included in ACK returned from destination nodes,E-OAODV tries to transfer data to destination node while routing failures occurred.And at the same time,with modifications in both TCP and OAODV,E-OAODV tries its best to recover the lost data caused by routing failures.By N...
基于ns-2的网络半实物仿真平台实现
许文强,张国霞,王新红,刘富强
计算机应用 , 2010,
Abstract: ?ns-2是一款广泛使用的网络仿真软件,但针对它的半实物仿真方法研究较少。针对这一问题,通过实际实时业务流与虚拟仿真网络的映射,提出并实现一种新的基于ns-2的网络半实物仿真hil-ns平台。在详细描述hil-ns平台构成基础上,讨论并解决了其实现的关键技术。在车载通信网络(vanet)实例下对802.11b无线mac协议性能进行仿真,结果表明hil-ns平台不但能与ns-2纯仿真的结果趋势保持高度一致性,并且在支持传统数据分析的同时,能有更直观的仿真性能实时输出。
Network Simulation Technology and the Application and Practice of OPNET
网络仿真技术与OPNET应用实践

Dan HuaiWei,Li MingSheng,Wang ShaoHua,
石怀伟
,李明生,王少华

计算机系统应用 , 2006,
Abstract: 网络仿真技术是研究人员在进行网络规划与设计时必要的、有效的工具。本文首先简要介绍了几种常用的网络仿真软件,接着重点分析了网络仿真软件OPNET的主要特点、三层建模机制以及OPNET的仿真方法和步骤, 最后通过一个实例来讨论了OPNET技术在具体网络规划和设计中的应用。
基于定向广播的aodv控制报文抑制研究
韦智仁,单志龙
计算机应用 , 2011,
Abstract: ?aodv路由协议是通过全向广播请求报文和定时广播hello报文来建立adhoc网络的路由,但在路由发现阶段需要广播发送大量的请求控制报文,导致了协议性能的下降。针对此问题,提出了一种新的基于定向广播的路由协议,该协议通过定向广播发送请求报文,并根据节点的移动性动态调整hello报文的发送时间间隔来减少报文的发送。理论分析和仿真结果表明,该方法能有效地减少控制报文的数量,减少路由负载,也显著提高了端到端时延、平均投递率等性能参数。
一种提高tcp性能的移动自组网e-oaodv协议的实现
邬春学 杨朝梁?
计算机科学 , 2009,
Abstract: 为了改善移动adhoc网络环境下tcp的性能,对aodv的改进协议0aodv协议做了一定的修订,得到e-oaodv(enhancedoptimaladhocon-demanddistantvector)协议。该协议通过在路由失效时使用来自目的节点的ack应答信号所包含的路由信息来尝试继续传输数据,同时通过对oaodv和tcp两者的修订来实现在路由重建后尽可能地恢复因路由失效所丢失的数据包。ns2下的仿真结果表明,e-oaodv对断线点离源节点较近的情况下的tcp性能有较显著的改善,尤其在路由总
基于ns-2仿真的接纳控制性能分析
王春峰 卢睿 陈秀忠?
计算机科学 , 2003,
Abstract: performanceanalysisisanimportantaspectinthedesigningofadmissioncontrolmecnamsm,inoraertoevaluatetheadmissioncontrolmechanism,weshouldgetthecriticaldataintheexperiments,whichisdifficultinrealnetwork.networksimulationis
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