新型互联网中基于连接标识的移动切换机制研究与实现

发布时间：2019-05-01 06:27

【摘要】：随着网络和无线接入技术的发展,多宿主的移动终端越来越普及,用户在不同网络间进行切换的需求越来越多。传统的传输协议如TCP、UDP等协议不支持路径切换,新型互联网面向连接的传输控制协议(Connection-Oriented Transmission Control Protocol for New Internet,COTCP),选择多条路径中最优的一条路径作为主路径进行传输,其他路径作为备选路径,而且可以在主路径出现故障时,迅速切换到备用路径进行数据传输。多宿主的移动终端在不同网络间进行切换时,由于网络状况的改变,可能会导致连接中断。因此本文结合新型互联网架构,设计并实现了基于连接标识的移动切换机制,在移动切换前,提前预判将要切换的路径,切换时通过连接标识,在移动过程中保持连接。首先,本文研究了新型互联网架构,分析了使用连接标识进行传输的优点,研究并实现了连接标识和基于连接标识的套接字。使用连接标识进行通信可以更有效地管理连接,增强网络传输的移动性和安全性,达到身份与位置分离的目的。其次本文设计并实现了基于连接标识的移动切换模块,包括路径状态模块、移动预切换模块以及路径参数估计模块。在路径参数模块本文研究并实现了多种路径选择机制,包括基于带宽的选路、基于最小时延的选路和基于拥塞窗口的选路等。基于连接标识的移动切换机制可以侦测网络状况的变化并进行预判,选择最优的路径作为切换后的主路径进行传输。最后本文对基于连接标识的移动切换机制进行了测试验证。通过测试,表明该方案基本满足移动切换的功能需求,即网络状况发生改变时,可以及时进行路径切换,且选择最优的路径进行路径切换。
[Abstract]:With the development of network and wireless access technology, multi-homed mobile terminals are becoming more and more popular, and more users are required to switch between different networks. Traditional transport protocols, such as TCP,UDP, do not support path handoff. A new connection-oriented transmission control protocol (Connection-Oriented Transmission Control Protocol for New Internet,COTCP) is proposed, and the optimal one of the multiple paths is chosen as the main path for transmission. Other paths act as alternate paths and can quickly switch to alternate paths for data transmission in the event of a failure of the primary path. When a multi-homed mobile terminal switches between different networks, the connection may be disrupted due to the change of the network condition. Based on the new Internet architecture, this paper designs and implements a mobile handoff mechanism based on connection identification. Before the mobile handover, the path to be switched is predicted in advance, and the connection is maintained in the process of mobile switching through the connection identification. First of all, this paper studies the new Internet architecture, analyzes the advantages of using connection identification for transmission, and studies and implements connection identification and socket based on connection identification. Using connection identification to communicate can manage the connection more effectively, enhance the mobility and security of network transmission, and achieve the purpose of separating identity from location. Secondly, the mobile switching module based on connection identification is designed and implemented, including the path state module, the mobile pre-switch module and the path parameter estimation module. In the path parameter module, this paper studies and implements a variety of path selection mechanisms, including bandwidth-based routing, minimum delay-based routing and congestion window-based routing. The mobile handoff mechanism based on connection identification can detect the change of network condition and prejudge, and select the optimal path as the main path after switching. Finally, the mobile handoff mechanism based on connection identification is tested and verified. The test results show that the proposed scheme basically meets the functional requirements of mobile handoff, that is, when the network condition changes, the path handoff can be carried out in time, and the optimal path can be selected to carry on the path handover.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP393.0

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