Design and Performance Analysis of Objective Functions for RPL Routing Protocol

Wireless Personal Communications - Standardized by Internet Engineering Task Force (IETF) working group, RPL (Routing Protocol for Low Power and Lossy networks) stands as an effective IPV6 Routing...     

基于ACP的RPL路由协议设计与实现

有损低功耗网络路由协议(Routing Protocol for Lossy and Low-power Networks,RPL)是为解决在无线传感网中无线传感节点受限而被提出,现有的实现是基于Contiki和Tiny操作系统,并不能应用在基于有线自治网络的自治控制平面(Autonomic Control Plane,ACP)中。为了对ACP提供可靠的通信支撑,设计和实现了基于ACP的RPL路由协议软件。协议软件主要由通信模块、消息处理模块、路由构造模块以及路由维护模块组成。其中,针对协议的实现是基于Linux操作系统根据ACP标准使用C语言进行开发。测试结果表明,实现的RPL协议能够支持ACP中正常的通信功能。     

IRH-OF: A New Objective Function for RPL Routing Protocol in IoT Applications

Wireless Personal Communications - Faced to challenges of low power and lossy networks (LLN’s) as well as the nature of these networks without infrastructure, it remains the subject of...     

无线多跳混合路由视频传输

提出了一种同时利用机会路由和传统路由进行跨层优化的实时视频传输方法,通过将I帧和P帧分别利用不同路由进行传输,获得了比单独利用传统路由或机会路由更好的性能。     

按需路由协议不同业务模式下性能仿真与分析

目前对移动Ad hoc网络的研究主要集中在新的应用上,如联合计算、投票系统、资源管理、协作游戏等。新应用使得Ad hoc网络业务模式不再是点对点模式。使用OPENT软件,首先对按需路由协议进行点对点通信性能仿真,其次通过改变源业务模式对协议的网络性能进行仿真,最后对实验结果进行分析。     

Robust Multi-Path Zone Routing Protocol for Video Transport Over Reconfigurable Wireless Networks

Multimedia transport has stringent bandwidth, delay, and loss requirements. It is a great challenge to support such applications in reconfigurable wireless networks (RWNs). Using multiple paths in parallel for multimedia transport provides a new degree of freedom in designing robust multimedia transport systems. In this paper, we provide a multi-path extension to zone routing protocol (ZRP) to support video transmission over RWNs. We compare ZRP and our multi-path routing scheme by using NS-2 simulator. The experiments show that our method is effective in improving the robustness of video transport over RWNs.

浅析智能物件网络中的RPL路由技术

在智能物件网络中路由器以及节点之间的连通性都受到约束,所以根据智能物件网络的特点,IETF（互联网工作任务组）中的ROLL工作组为低功耗有损网络（LLN）制定路由方案,设计了一个叫做RPL的路由协议。本文将对RPL路由协议进行研究,分析其协议内容,包括设计原则、拓扑结构、路由创建等,总结出RPL路由的特点。     

无线Mesh网络路由协议——多射频质量源路由（MR-LQSR）协议

无线Mesh网络使用传统的基于最短路径的移动Ad Hoc网络路由协议并不能获得良好的性能,为此提出了一种新的无线Mesh网路由协议——MR—LQSR算法及新的路由判据——WCETT．能在吞吐量与延时之间获得一种平衡。     

DSR路由协议的改进

DSR路由协议是移动Ad Hoc网络常用的按需路由协议之一。由于采用洪泛机制寻找和维护路由表,DSR路由协议能量开销高、分组交付率低。针对此问题,提出局部化路由查询方法,限制路由请求跳数,改进DSR路由协议的路由发现过程,有效地平衡了路由信息存储量、网络拥塞和能量消耗。分析表明,改进的DSR路由协议将路由请求分组控制在一定的网络范围内,减少数据传输时延、降低网络能量开销。仿真结果显示,在选择适当的最大跳数时,改进的DSR路由协议在分组交付率、路由载荷方面均优于传统的DSR路由协议。     

应用于无线Mesh路由协议的研究

文章在研究应用于无线Mesh网络的DSR协议多播过程中发现会产生网络风暴问题,对此提出了一种均衡流量的距离门限动态源路由协议,对它进行仿真,仿真结果表明使用了该方法的路由算法在吞吐量上较原算法有较大改善。     

Advances in Wireless Video Delivery

This paper reviews practical video delivery technologies, examining existing mobile networks, commercialized or standardized transport, and coding technologies. Compression efficiency, power dissipation, and error control are intrinsic issues in wireless video delivery. Among these issues, error control technologies are evaluated at four layers: 1) layer-1/2 transport; 2) end-to-end transport layer such as TCP/IP or RTP/UDP/IP; 3) error-resilience tool and network adaptation layer) and 4) source coder layer. Layer-1/2 transport tends to provide two distinct conditions: one quasi-error-free, in which upper layer error control technologies show a limited improvement, and one with a burst of errors during the fading period, in which the adaptability of error control is essential. Emerging mobile network quality of service will have a large variation of bandwidth and delay. Thus, adaptive rate control and error recovery are identified as more crucial issues for future research.     

后备路径在自组网AODV协议中的应用

研究了后备路由策略在自组网AODV协议中的应用。通过仿真实验证明在不增加控制信息个数的条件下,后备路由策略能有效提高AODV协议的数据平均递交率。     

Utilizing Neighbours-Table to Improve Tree Routing Protocol in ZigBee Network

ZigBee is an industrial standard for wireless ad hoc networks based on IEEE 802.15.4. It has been developed for low cost, low data rate and low power consumption. ZigBee??s network layer defines two routing protocols namely Ad Hoc On-demand Distance Vector and Tree Routing (TR). TR protocol follows the tree topology (parent?Cchild) in forwarding the data packets from source nodes to the sink node. However, the source does not find rather nor the location of the sink is close to the source node or if it is not in the sub-tree. In this case it will follow the tree topology which will use a lot of hops to deliver data packets to the sink node. This paper present an improvement of TR protocol for ZigBee network and is called Improved Tree Routing (ImpTR) protocol which is computationally simple in discovering the better path to transmit data packets to the sink node, and does not need any addition in hardware. ImpTR determines the better path to the sink node depending on the tables of the neighbouring nodes, which is part of the existing ZigBee network specification. Results show that the proposed algorithm provides shorter average end-to-end delay, increase throughput, decrease the average number of hops and decrease the energy consumption from the network when compared to the original TR routing protocol.     

一种实现流量工程的约束路由算法

提出了一种在动态网络中实现流量工程的分布式约束路由算法。该算法以增强型内部网关路由协议(EIGRP)收集网络资源信息,以优化的泛洪算法来获取显示路由。该算法采用延时和带宽为约束条件,其实现简单,满足动态组网的要求,并避免了传统泛洪机制在寻路过程中造成的网络资源的浪费。最后,给出了算法的实现框架。     

对MANET AODV路由协议攻击效果分析

移动无线自组织网络(Mobile Ad Hoc Network,MANET)具有抗毁性强、组网灵活的特点,战场通信环境是其很重要的应用背景,基于距离向量的按需路由协议(Ad-hoc On-demand Vector Routing,AODV)在移动无线自组织网络中具有广泛的应用。针对移动无线自组网AODV路由协议,在分析其工作原理的基础上,建立网络流量的分析模型。从网络发起泛搜索路由引起网络流量变化的角度,分析不同的协议攻击方法对网络的影响。     

Design and Implementation of Routing Algorithm to Enhance Network Lifetime in WBAN

Today’s era is the era of smart and remote applications exploiting advancement in sensors, cloud, Internet of things etc. Major application is in healthcare monitoring and support using wireless body area network (WBAN) in which sensor nodes sense vital physiological parameters and send to server through sink i.e. smart phone nowadays for seamless monitoring. The most significant issue in such applications is energy efficiency which leads to enhanced network life time that ensures uninterrupted seamless services. From source to sink data transmission may occur considering three different scenarios: source to sink single hop direct data transmission irrespective of in-between node distance, source to sink multi hop data transmission in which transmission range of source node is fixed at a threshold to find next forwarder node and transmission range of source node is incremented by affixed value until data gets transmitted to sink. In this work WBAN having different network configurations based on fixed or random positions of nodes have been simulated. Different scenarios with fixed and varying number of nodes are framed and simulated using MATLAB 2020a for performance evaluation of proposed algorithm in terms of energy consumption, network lifetime, path loss etc. due to data transmission from source to sink. Experimental results show that incremental approach is better than direct one in terms of energy consumption, path loss and network lifetime. While selecting transmission range of a source node, it is considered to keep Specific Absorption Rate (SAR) lower to reduce impact on human tissue.

     

Modeling the MPEG-1 Video Traffic

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Ad hoc网络中的路由技术

Ad hoc网络是一些移动节点组成一个多跳的临时性无线自治系统，这种新型的通信网络具有动态变化的拓扑结构和分布控制的网络机制。文中针对Ad hoc网络作了简单的介绍并重点介绍了针对Ad hoc网络特性而提出的路由协议。     

车载自组织网络RBVT-R协议的改进

分析了基于地理位置的路由协议RBVT-R.针对RBVT-R协议在路由建立过程及分组转发过程中的缺陷,提出了一种RBVT-R协议的改进算法.该算法在路由建立过程中,根据自主获取的道路车辆密度改进了RBVT-R协议的洪泛机制;在分组转发过程中采用基于方向和位置预测的转发方法,解决了分组在同一路段重复传输的问题.仿真结果表明,提出的改进策略有效地提升了分组的交付率与端到端平均时延.