中文摘要：

随着半导体技术的发展，芯片设计者已经能够采用网络五连的方式将不同的IP核连接起来——片上网络（Network on Chip）。随着更多的实时性业务在片上网络中的出现，服务质量就成为片上网络设计中必须考虑的一个因素。用于提高片上网络服务质量的模型主要有面向连接、非连接及混合交换的网络模型。本文从资源、网络性能提高等方面对它们进行对比分析，并给出具体的片上网络的应用实例，为以后片上网络的设计提供参考。

英文摘要：

With the development of semiconductor techniques, chip designers are capable of interconnecting various IP cores by adopting the method of interconnected networks Network on Chip（NoC）. As the emergence of more real-time applications in NoC, greater prominence should be given to QoS. Connection-oriented, connectionless, and hybrid switching networks are all examples of techniques to improve QoS. And all these techniques, for later reference, are studied from the aspects of resource usage and performance enhancement in this paper.