普适计算中服务发现协议的研究

发布时间：2018-05-24 17:22

本文选题：普适计算 + 服务发现　；参考：《吉林大学》2013年硕士论文

【摘要】：随着电子信息技术的不断发展，，各种便携式计算设备的普及，人类要面对的计算环境越来越复杂，计算模式的问题变得越来越微妙。计算模式的演变经历了从多人共享一台大型机的主机计算（Mainframe Computing）时代发展到一个人使用一台电脑的个人机计算（Personal Computing）时代，再到当今的互联网计算（InternetComputing）时代，计算技术的发展一直伴随着计算模式的演变。近年来小型计算通信、通信设备的普及，传感器技术、互联网技术、嵌入式技术的发展，人们对计算的需求变的越来越多样化、智能化、随时随地化，为适应这些改变，我们需要一种全新的计算模式，即下一代计算模式——普适计算（Pervasive Computing）。普适计算这的概念最早是由前Xerox PARC计算机科学实验首席科学家Mark Weiser在1991年提出的，中所谓的普适计算并不是指一种全新的技术，而是利用计算机技术、通信技术、传感器技术、网络技术、嵌入式技术等实现信息空间与物理空间的融合的一种计算模式。在普适计算环境中，人们可以随时随地简单地，透明地使用网络提供的服务，而为了实现这一目的，就需要服务发现技术的支撑。服务发现技术关注的是当用户有服务需求时，系统如何有效的为用户查找、匹配最佳服务，并提供给用户使用。服务发现协议是服务发现技术的核心内容，而传统的服务发现协议难以适用于未来普适计算环境中对服务发现的需求。普适计算与传统的桌面计算在计算环境、网络配置、用户使用习惯等方面存在有着明显的差异，因此需要在传统服务发现的基础上设计并开发一种新的服务发现协议以适应普适环境中的服务发现问题。本文仔细研究对比了大量的已有的服务发现协议，发现移动无线自组网络中的服务发现协议相比较于局域网、广域网中的服务发现协议，可以更好的满足普适计算环境中服务发现的新特点。而基于群组的GSD(Group-based Service Discovery)协议是无线自组网环境中性能较为突出的一个协议，他的基于群组的智能转发服务请求，节点定期广播自身的服务广告信息等特点可以使用户在普适环境中更高效地发现所需服务。但GSD协议本身存在着一些明显的不足（如：大量的重复的服务请求包）并不能很好的适应普适计算环境的特点。为了解决这些不足，本文根据普适计算环境中服务发现的特点提出了一个基于GSD协议的改进协议——效能增强的基于群组的服务发现协议EPGSD(Enhanced Performance Group-Based Service Discovery)。并通过在GloMoSim仿真软件中做了相关的仿真实验，验证了EPGSD在一些方面的性能，证明了EPGSD的有效性。
[Abstract]:With the development of electronic information technology and the popularization of portable computing devices, the computing environment is becoming more and more complex, and the problem of computing mode becomes more and more delicate. The evolution of computing mode has gone from the era of mainframe computing for multiple people sharing a mainframe to the era of personal computing for one person using one computer, and then to the age of Internet computing for Internet computing. The development of computing technology has been accompanied by the evolution of computing models. In recent years, with the popularization of small computing communication, the popularization of communication equipment, the development of sensor technology, Internet technology and embedded technology, people's demand for computing has become more and more diversified, intelligent, anytime and anywhere, in order to adapt to these changes. We need a new computing model, the next generation of computing-pervasive computing. The concept of pervasive computing was first put forward by Mark Weiser, the former chief scientist of Xerox PARC computer science experiments, in 1991. The so-called pervasive computing does not refer to a new technology, but to the use of computer technology, communication technology, sensor technology. Network technology, embedded technology and so on realizes the information space and the physical space fusion one kind of computation pattern. In the pervasive computing environment, people can easily and transparently use the services provided by the network at any time and anywhere, and in order to achieve this goal, the support of service discovery technology is needed. Service discovery technology focuses on how to effectively find the best service for the user and provide it to the user when the user has a service requirement. Service discovery protocol is the core of service discovery technology, but the traditional service discovery protocol is difficult to adapt to the requirement of service discovery in the future pervasive computing environment. There are obvious differences between pervasive computing and traditional desktop computing in computing environment, network configuration, user usage habits, etc. Therefore, it is necessary to design and develop a new service discovery protocol based on traditional service discovery to adapt to the problem of service discovery in pervasive environment. This paper carefully studies and compares a large number of existing service discovery protocols, and finds that the service discovery protocols in mobile wireless ad hoc networks are compared with those in local area networks and wide area networks. It can better meet the new features of service discovery in pervasive computing environment. The group-based GSD(Group-based Service Discovery) protocol is one of the most outstanding protocols in the wireless ad hoc network environment. Nodes regularly broadcast their own service advertising information to enable users to find the required services more efficiently in a universal environment. However, the GSD protocol itself has some obvious shortcomings (such as: a large number of repeated service request packets) can not adapt to the characteristics of pervasive computing environment. In order to solve these problems, this paper proposes an improved service discovery protocol based on GSD protocol, EPGSD(Enhanced Performance Group-Based Service discovery protocol based on performance enhancement, according to the characteristics of service discovery in pervasive computing environment. The performance of EPGSD in some aspects is verified and the validity of EPGSD is proved by the relevant simulation experiments in GloMoSim simulation software.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TP393.04

【参考文献】