IEEE 802.11e無線網路上針對H.264多媒體串流之動態封包選擇性傳輸機制

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Abstract With the increasing usage of wireless networks and the demand for multimedia applications, such as video streaming, videophone, high definition television (HDTV) etc., it is very important to provide quality of service (QoS) for real-time applications over Wireless Local Network (WLANs). To support QoS in WLAN, the 802.11 Working Group has developed a new protocol, IEEE 802.11e, to provide service differentiation at the medium access control (MAC) layer. Because of wireless channel characteristics, such as shadowing, multi-path, fading, and interferences, the allocated bandwidth is usually not fixed. It results in ineluctable degradation in QoS. Solutions to deal with wireless bandwidth fluctuations consist of link adaptation (LA) and rate adaptation (RA). However, these approaches rely on the slow feedback of physical layer to adapt transmission rate and do not consider characteristics of traffic and codec. Thus, they may not satisfy requirements of strict bandwidth guarantee

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