Multimedia transmission over wireless has become more and more important with the increasing popularity of wireless multimedia application. Video streaming has many QoS requirements, for instance, delay sensitive and smooth rate variation. Meanwhile, compared with wired channel, wireless channel has more constraints, such as limited bandwidth, high delay, and high BER (bit error rate). In order to address the above problems, this paper proposes a novel TCP-Friendly rate control mechanism for video streaming over wireless. It differentiates previous rate control algorithms in three aspects: redefinition of loss interval to make it applicable to both variable packet size stream and constant packet size stream; Recursive Least Square (RLS) algorithm has been introduced to get better estimation of RTT and respond to RTT change fast; Buffer occupancy information in the last hop is fed back to sender, then sender makes use of the information to control connection num to improve bandwidth usage rate. Through simulations, it is proved that our rate control mechanism can respond to bandwidth change fast and keep smooth transmit rate. At the same time, our algorithm can detect congestion in the bottleneck accurately and fast and achieve high bandwidth usage rate.
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