Research on 2D-Adaptive Rate Control Model for Streaming Media Distribution in Heterogeneous Wireless Access Environments
Zhu Qiang Xiao · 2006
The method of TFRC(TCP-Friendly Rate Control)adapts to rate control of video streaming transmitting by UDP stream,which can guarantee throughputs of UDP streams with well TCP- Friendly features.Furthermore,it can be adopted to detecting available bandwidth for heterogeneously accessing clients.However,this method is fraught with new challenges in wireless channels.According to features of wireless channels,this paper proposes a 2D-adaptive rate control model for streaming media distribution in heterogeneous wireless access environments.Based on statistics of PLR (packet loss ratio) and BER (Bit Error Ratio),2D adjustment according to packet size and frame rate can be carried on.Firstly,packet size and transmission interval are regulated based on the statistics of BER to present throughputs with const frame rate.Secondly,according to TFRC equation,FER (Frame Error Ratio) and available bandwidth calculated by RTT (Round Trip Time),RTO (Retransmission timeout) and PLR estimations are adopted as indexes to regulate frame rate.Simulation results demonstrate effectiveness of proposed schemes.