With the technology advances in wireless and broadband Internet technology, multimedia communications over network are dramatically boosted. However, a best-effort network with variable available bandwidth and delay may result in degradation of received video quality drastically. Hence, Rate Control plays a key role in transmission systems, but wireless networks with many non-congestion losses may bring huge performance reduction to current TCP and TFRC. This thesis proposes a Loss Differentiation Algorithm (LDA) over WLAN environment, which could distinguish between packet losses due to buffer overflow or those due to bit errors. It avoids treating wireless losses as congestive, which leads to unnecessary rate reduction and poor performance. We try to notice wireless transmission error to upper layers by exploiting the signaling messages from the standard. Besides, data retransmission may put the incoming packets to be dropped due to buffer overflow when the common used technique ARQ is turned on. In certain circumstances, wireless transmission error message could be translated into congestion warning. Therefore, we try to modify the separation ratio in the algorithm and observe its behaviors in different network conditions. Simulation results show that, the receiving rate of the protocol with LDA is 9 times higher when ARQ is turned off; tuning the separation ratio properly would not degrade the rate but improves congestion loss rate and delay time massively.