A new mechanism of transmitting MPEG-4 video in IEEE 802.11 wireless LAN with DCF

The basis of IEEE 802.11 wireless LAN medium access control (MAC) is distributed coordination function (DCF). When network load in WLAN is moderate or even higher, with DCF a station may need to defer several seconds before transmission. This will degrade the performance of real time applications such as MPEG-4 video stream. This paper proposes a new mechanism for deliver MPEG-4 video stream with DCF. Simulations show that our mechanism provides much less delay and jitter while obtains the same goodput and fairness.