| Summary: | 碩士 === 國立暨南國際大學 === 電機工程學系 === 99 === IEEE 802.11 defines EDCA for differentiated services, where each AC queue operates independently to contend for the wireless channel. When number of station increases, the collision probability increases dramatically. Furthermore, the lower priority ACs may starves at heavy load situations. In an infrastructure WLAN, the AP is the bottleneck for downlink, packets because the AP needs to contend with numerous stations, resulting in asymmetric throughputs between downlink and uplink. In order to mitigate the above- mentioned problems. In this thesis, we propose a new MAC architecture including the new queue management module and the super mode. By the scheduler of the queue management module, we can mix different AC packets for a given TXOP duration. Moreover, the AP can determine which station should be served by scheduler. With the super mode, the AP can grant the wireless channel without contention. Simulation results show that, the proposed system can balance the uplink and downlink traffic, reduces high collision probability, and improves the overall capacity.
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