A Study of Virtual Admission Controlin wireless LAN

• Main Authors: Yuan-Long Lee, 李元隆
• Other Authors: Yen-Wen Chen
• Format: Others
• Language: en_US
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/80942049620146398358

碩士 === 國立中央大學 === 通訊工程研究所 === 92 === With the promotion of wireless technologies, more and more devices are built-in wireless capabilities such as notebook, PDA and cell phones. There are much more wireless applications from the cell phone, GRPS (General Packet Radio Service) mobile phone capable of browsing the Internet, to the notebook that supports video conference. The traditional wireless technology confronted with some shortcomings in practical use, such as insufficiency for bandwidth, and lack of guaranteed the QoS (Quality of Services). In this thesis, we propose an algorithm, called VAC (Virtual Admission Control), to regulate the call request for the provisioning of QoS in wireless LAN. First, we study some methods that have been proposed to support QoS in wireless LAN. These methods include changing the IFSs, changing backoff window in MAC, VS/VMAC and currently 802.11e draft. We combine the advantages of the above methods and propose the VAC algorithm applied for the wireless LAN. VAC can admit some requested demands without deteriorating the wireless medium too much. Finally, we define some notations and construct a simulation environment to verity the performance of the proposed algorithm.