Development of a trace generation and analysis software for random mobility models.

No abstract available.The original print copy of this thesis may be available here: http://wizard.unbc.ca/record=b130305

可量化的移动Ad Hoc网络时空动态特性评估方法

移动模型是Ad Hoc网络区别于其他形式网络的重要标志,对其产生的动态网络特性(简称动态特性)进行评估,是研究Ad Hoc网络的协议仿真和网络相关技术(如拓扑控制和网络性能测量等)的基础性问题.在已有研究的基础上,改进了网络的模型化描述,克服了以往模型无法很好地描述相关联的时空动态特性的缺陷,并在此基础上,提出了移动模型通用的可量化时空动态特性评估方法.通过构建节点空间位置分布,建立网络拓扑时空动态特性的分析模型,深入研究了几种移动模型的动态性.提出一种圆周曲线移动模型,弥补了以往移动模型难以描述现实的曲线移动场景.仿真实验结果表明,该方法能够有效地对现有移动模型的动态性进行评估.实验结果表明,圆周曲线移动模型与以往移动模型相比,具有良好的时空动态特性

Coverage, connectivity and failure recovery control of wireless sensor networks under mobility

Recent advances in micro-electro-mechanical technology, embedded systems and wireless communications, with demands for greater user mobility have provided a major impetus toward the development of deployable, controllable, and self-healing mobile sensor networks. This thesis considers mobile sensors and the control of their mobility. The objective of this thesis is to present a novel sensor movement control strategy in which a commander controls a cluster of mobile sensors to monitor a target region ahead of the commander, and in the direction of the commander\u27s movement. Once the speed and direction of the movement of the commander are changed, the new positions of the sensors are decided by our control algorithm, and the sensors move to their new positions at a speed and in a direction also determined by the algorithm. After an upper bounded adjustment time, the sensors will all arrive at their new positions and the commander monitors a new region by these sensors. Connectivity between sensors during movement is guaranteed. Simulation results are presented to demonstrate the effectiveness of the movement strategy. Since mobile sensor failure is inevitable and always results in data unavailability and communication unavailability faults, this thesis also presents a fault tolerance strategy, in which an estimation recovery mechanism is used to solve data unavailability fault. An algorithm is introduced which determines the movement of backup sensors in order to guarantee that the network bi-connected, and hence can withstand single sensor faults, and therefore solve communication unavailability problem

Evaluation of MANET Routing Protocols in Realistic Environments

Projecte final de carrera realitzat en col.laboració amb College of Electronics and Information Engineering. Tongji UniversityRecently, many researchers have become interested in MANET (Mobile Ad-hoc NET- works) to construct a self-con gurable network without existing communication infras- tructure. This research presents the results of a detailed performance evaluation on several MANET routing protocols working under realistic environments. The routing protocols, mobility models and other aspects are explained and discussed in order to know how to use them properly to model real-life conditions. NS-2 and Bonnmotion were used to create the networks, services and environment characteristics in general. It is concluded which protocols can handle which applications and which not and that the performance of the protocols can be considerably di erent when more and more realistic elements are taken into account. This should be considered in further researches since the nowadays evolution of MANET will bring them soon into services of our society