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Research on Autonomous Distributed Wireless Ad Hoc Networks

自治分布式无线Ad Hoc网络研究

基本信息

批准号：
16206040
负责人：
YOSHIDA Susumu
金额：
$ 29.62万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

Autonomous distributed wireless ad hoc networks are self-configuring systems formed by co-operating nodes without any established infrastructure. A key assumption is that any two nodes can communicate directly or using multi-hop relaying. By paying attention to multiple layers, i.e., physical, media access control, network, etc., several essential properties of wireless ad hoc networks are clarified. Major research results are summarized below.1.Symbol rate control and multi-hop transmission have the same ability to expand the service area at the loss of throughput. Numerical results revealed a significant difference between symbol rate control and multi-hop transmission such that only multi-hop transmission can increase the spatial spectral efficiency.2.In distributed control wireless ad hoc networks, there might occur conflicts in route selection among multiple routes if each node seeks for better route with better throughput in a selfish manner due to mutual interference. To analyze … More this behavior, game theory is found to be effective and is applied to evaluate the achievable throughput. It is revealed that when the transmit power is low, decentralized adaptive route selection may attain throughput near the capacity.3.CSMA/CA is widely used for media access control protocol of ad hoc networks. In order to meet the demand to increase the network throughput, multi-channel and channel bonding techniques are proposed to effectively utilize multiple existing channels. Numerical and simulation results indicate that under low-traffic conditions, channel-bonding technique can achieve a low delay, while under high-traffic conditions, the multi-channel technique improve both throughput and delay.4.TCP is widely considered to be a transport protocol for ad hoc networks. However, instable link quality of wireless networks may result in lower efficiency compared to wired networks. A new decoding method which makes Tornado-type codes effective to bit errors by exploiting error packets is proposed and the advantage of the proposed method is confirmed by experiments. Less

自治分布式无线自组织网络是由协作节点形成的自配置系统，无需任何已建立的基础设施。一个关键假设是任何两个节点都可以直接通信或使用多跳中继进行通信。通过关注多个层，即物理层、媒体访问控制层、网络层等，无线自组织网络的几个基本属性被阐明。主要研究成果如下： 1.符号速率控制和多跳传输具有相同的能力，可以在损失吞吐量的情况下扩大服务范围。数值结果表明符号率控制和多跳传输之间存在显着差异，只有多跳传输才能提高空间频谱效率。2.在分布式控制无线自组织网络中，如果每个节点由于相互干扰而以自私的方式寻求更高吞吐量的更好路由，则可能会出现多条路由之间的路由选择冲突。为了分析这种行为，博弈论被发现是有效的，并被应用于评估可实现的吞吐量。结果表明，当发射功率较低时，分散式自适应路由选择可以获得接近容量的吞吐量。3.CSMA/CA广泛应用于自组织网络的媒体访问控制协议。为了满足提高网络吞吐量的需求，提出了多信道和信道绑定技术，以有效地利用多个现有信道。数值和仿真结果表明，在低流量条件下，信道绑定技术可以实现低延迟，而在高流量条件下，多通道技术可以提高吞吐量和延迟。4.TCP被广泛认为是自组织网络的传输协议。然而，与有线网络相比，无线网络的链路质量不稳定可能会导致效率较低。提出了一种利用错误包使Tornado型码有效消除误码的新译码方法，并通过实验证实了该方法的优点。较少的