Improve 802.11 PCF Efficiency by Group-Polling Scheme

• Main Authors: Chun-Hsing Liu, 柳俊興
• Other Authors: Fang-Chang Kuo Ph. D
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/25633045587254347339

碩士 === 國立宜蘭大學 === 電子工程學系碩士班 === 96 === With the arrival era of multimedia, the data amount needed to transmit and dealing with presents the increase of geometric series, and consumers require higher and higher quality of the multimedia. Driven by the market demand, not only high bandwidth while transmitting multimedia data is required, but also QoS (Quality of Service) should possess to the multimedia. This function should be supported in network technology. Under the tide of multimedia, the WLAN technology has already support QoS function at a high speed and satisfy multimedia demand. In this thesis, a Group-Polling Scheme (GPS) is proposed. It combines contention free polling and Transmission Opportunity (TXOP) assignment, augmented with modification of polling frame format and polling list management. It also has some improvement in terms of low power management. The proposed scheme outperforms some other schemes recently proposed in the literature which generally improve WLAN capacity at the cost of increased waiting time delays. The benefits of the GPS are demonstrated in the simulations results, ex︰alleviates polling overhead and packets loss, increases throughput.