| Summary: | 碩士 === 國立臺北科技大學 === 資訊工程系研究所 === 96 === WiMAX (Worldwide Interoperability for Microwave Access), based upon the IEEE 802.16 standards, provides wireless broadband access for metropolitan area networks. The wide coverage and high data rate make it a promising technology to substitute DSL and Cable for last mile access. In the IEEE 802.16 standard, there are three sublayers defined in the MAC protocol: the convergence, common part, and security. The convergence sublayer is in charge of payload classification and payload header suppression. It plays an important role in differentiating QoS (Quality-of-Service) classes and saving radio transmission capacity.
The thesis focuses on the realization of the convergence sublayer under the MAC protocol stack. We design an intelligent classifier that can categorize packets not only by well-known identifiers such as IEEE 802.1p priority, VLAN ID, port number, and ToS/DSCP, but also by examining payload type. The classification rule can quickly and automatically set up for further packet processing. In turn, the design of header suppression follows the rule given in the standard.
The implementation of the convergence sublayer was first tested in PC environment and then transplanted into a Sunplus SPCE3200 embedded system. All functionalities were verified as well.
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