基于mSCTP-CMT的垂直切换策略研究
发布时间：2018-02-19 19:02
本文关键词： 垂直切换 (mSCTP-CMT)-RSS 丢包率 吞吐量 切换时延 出处：《东北大学》2014年硕士论文 论文类型：学位论文
【摘要】：随着互联网技术和通信技术的进步,人们对于信息通信的需求不断扩张；同时随通信技术尤其是无线网络技术的日益进步,催生了多种异构无线网络在使用中协同工作,因此移动节点在异构网路之间能够实现无缝平滑的切换,是提高通信质量的关键：目前提高异构网络间的垂直切换性能的研究具有重要的理论意义和应用价值。现在已经有很多的研究机构和学者针对垂直切换的各方面内容进行研究,然而这些研究很多都只是针对一个方面进行研究的,如有的只针对无线接收信号强度RSS的研究,有的是只研究支持切换的一些协议,这样是不够的；垂直切换的关键技术是保证移动节点能够在合适的时间切换到合适的网络中,同时保证用户的通信不受到切换的影响,因此仅仅以某一个方面进行研究,提高的性能是有限的,也是不合理的。依据现有的研究方向,作了进一步研究分析,将结合接收信号强度RSS(Received Signal Strength)和下一代互联网端到端传输协议的SCTP的扩展协议]nSCTP-CMT。首先,RSS作为无线网络中最基本的参量,可以直观地反映无线网络的质量,以此为标准可以明确移动节点切换的时机；其次,mSCTP-CMT由于协议自身的特性可以动态地添加和删除IP地址,同时CMT(Concurrent Multipath Transmission)技术可以很好地实现软切换,保证切换过程的平滑,减少包重传数和丢包率,保证网络的吞吐量不会受到切换的影响；在此基础上提出了(mSCTP-CMT)-RSS的垂直切换策略,改进的地方是实现跨层次的设计方案,及时有效地实现切换,降低由于切换造成的切换时延,提高切换的性能,保证不会影响用户的通信质量。通过仿真实验验证了该策略的合理性与先进性。最后对课题进行了总结和展望,提出了下一步的研究方向。
[Abstract]:With the development of Internet technology and communication technology, people's demand for information and communication is expanding, and with the development of communication technology, especially wireless network technology, many heterogeneous wireless networks work together in use. Therefore, mobile nodes can achieve seamless and smooth handoff between heterogeneous networks. It is the key to improve the communication quality. At present, the research on improving the performance of vertical handoff between heterogeneous networks has important theoretical significance and application value. Now, there are many research institutions and scholars to study all aspects of vertical handoff. However, many of these studies are only focused on one aspect, such as the wireless received signal strength RSS research, some only research some protocols supporting handoff, this is not enough; The key technology of vertical handoff is to ensure that the mobile node can switch to the right network at the right time, and at the same time to ensure that the user's communication is not affected by the handover. Is also unreasonable. According to the existing research direction, has made the further research analysis, Combining the received signal strength (RSS(Received Signal Strength) with the next generation Internet end-to-end transmission protocol (SCTP extension protocol), nSCTP-CMT.Firstly, as the most basic parameter in wireless network, it can directly reflect the quality of wireless network. Secondly, mSCTP-CMT can dynamically add and delete IP address because of the characteristics of the protocol itself, and CMT(Concurrent Multipath transmission technology can realize soft handover well and ensure smooth handover process. In order to reduce the number of packet retransmission and packet loss rate and ensure that the throughput of the network will not be affected by handoff, a vertical handoff strategy for mSCTP-CMTU -RSS is proposed. The improvement is to realize the cross-layer design scheme and to realize handoff in time and effectively. The delay caused by handoff is reduced, the performance of handoff is improved, and the communication quality of users is not affected. The rationality and advanced nature of the strategy are verified by simulation experiments. The next research direction is put forward.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5
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