type Aware Error Control for Large I-Frames in Wireless Networks

• Main Authors: Liao, Gen-Liang, 廖根良
• Other Authors: Liao, Wei-Kuo
• Format: Others
• Language: en_US
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/31749274602334009376

碩士 === 國立交通大學 === 電信工程系所 === 96 === We propose an error control for delivering video frames of different sizes for interactive video service. The error control actions such as retransmission and adding redundancy codes are considered. For the purpose of low delay and small jitter, we use start-time fair queuing which is a suitable scheduling algorithm for video applications that have variable bit rate. When examining closely, we find that factors of the large I-frame, redundancies of RS-code, the temporal correlation between video frames significantly impacts the frame loss rate but dealing with them effectively is very challenging. In this thesis, we extend the early work of MDP-based error control for fixed size frames to do so. In our simulation, characterizing the channel by a two-state model where state durations follow the Erlang distribution of second order under wideband is considered. Our simulation shows that our proposed method reduces frame loss rate in all the simulation settings. Besides, it effectively reduces retransmission times and makes code-rate diversity.