We carry out a three layers network subsystem structure that is protocol independent layer in kernel, protocol dependent layer in kernel and user level protocol stack.

论文提出了一个三层网络子系统结构：内核级协议无关层、内核级协议相关层和用户级协议栈。

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Furthermore, UDT is not only a new control algorithm, but also a new application level protocol with support for user configurable control algorithms and more powerful APIs.

此外，UDT不仅是一个新的控制算法，也为用户可配置的控制算法和更强大的API支持新的应用程序级协议。

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Since the UNIX sockets interface based on TCP/IP protocol has succeed in communication, of course the user-level sockets over ULC will be popular to programmer, which is motivation of thesis.

基于UNIX TCP/IP的套接字接口已经为TCP/IP协议的应用谱写了成功的乐章，当然，基于用户级协议的高性能套接字接口也将为用户级协议的应用打开方便之门，这也是论文研究的重点。

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