End-to-end Qos Mechanisms For Wireless Local Area Network Business Network Research

In recent years, Internet has gained huge development, and all kinds of applications with Internet as medium is becoming more and more. Besides traditional Internet application such as WWW, FTP, E-mail, DNS and so on, many new applications about multimedia is popular. Different from common data, multimedia data has the character of real-time, that is it must satisfy a certain time command among datas. So the packets of the multimedia must receive special handler by the network. That is to say, network should provide Quality of Service support to provide different service for different applications. These services include bandwidth, delay, jitter, cost and so on. In IP network area, the DiffServ architecture designed by the IETF is in the leading position.On the other hand, as the portable devices such as laptops and palmtops become more and popular, the interest to have a level of services similar to those available from the conventional wired networks using those portable devices without wires is growing very fast these days. IEEE 802.11 Wireless LAN(WLAN) has become a prevailing broadband wireless technology.The customer in Wireless LAN(WLAN), he usually accesses remote wired stations.It will not receive satisfied QoS without the support of the Diffserv which is the QoS technology in IP network. However, in wireless LAN, Diffserv cannot function to traffic control for QoS. Instead, IEEE 802.11 are QoS in MAC layer. Since 802.11 are non-Diffserv domains, end-to-end QoS environment cannot be properly provided unless these different QoS techniques are coordinated under common QoS specifications.Our study is to propose a methodology translating the Diffserv to the IEEE 802.11.The paper introduces the important role of QoS in modern network technology at the first chapter, and in the second chapter, we study the QoS technology in WLAN, point out the outcome of some 802.11 protocol in providing QoS. As an important part, we introduce the latest protocol: E-802.11. We compared the performance with...