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Mobile WiMAX Transmission and Handover with Video Streaming – Real-Time Software Implementation on DSP and PC. Joint work of the following labs: Prof. David W. Lin – CESP Lab, Prof. ChingYao Huang – WINTech Lab
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Mobile WiMAX Transmission and Handover with Video Streaming– Real-Time Software Implementation on DSP and PC Joint work of the following labs: Prof. David W. Lin – CESP Lab, Prof. ChingYao Huang – WINTech Lab Dept. Electronics Engineering, National Chiao Tung University, Hsinchu, Taiwan, R.O.C. Prof. Jenq-Kuen Lee – Programming Language Lab, Prof. Wei-Kuan Shih – Real Time Lab, and Prof. Jyh-Cheng Chen – WIRE Lab Dept. Computer Science, National Tsing Hua University, Hsinchu, Taiwan, R.O.C. 2006/12 This research was supported by grants from the National Science Council of R.O.C. and the Institute for Information Technology, Taipei, Taiwan, under a project sponsored by MOEA, R.O.C.
PHY Architecture Uplink Rx Filter Sync. + Chan. Est. DeFEC + DeFraming FEC + Framing Tx Filter Channel Simulator (AWGN, SUI 1-6, ETSI_A) 1 DSP 2 DSPs Tx Rx Rx Filter DeFEC + DeFraming Sync. + Chan. Est. 1 DSP Tx Filter FEC + Framing Downlink 2 DSPs 1 DSP Rx Tx (DSPs are TI TMS320C6416Ts housed on Sundance DSP boards)
MAC Architecture (Implemented on Linux PC)
Fast SIP Handoff (Implemented on Linux PC)
Video Streaming System Parameters • Video RTP Server • RTP Version: 2.0 (RFC 3550) • 傳送的 frame rate 可以由使用者在命令列的參數作調整, 大約每秒送15張 • H.264 Video Bitstream 之 NAL unit 與 RTP 關係 • One NAL unit in one RTP packet • One slice in one NAL unit • One frame 只有一個slice • 基本上每個 RTP Packet 傳送一個 frame
Video Decoding Speed • H.264/AVC Decoder : 採用 Baseline Profile • 傳送 H.264/AVC 測試影片資訊(“2.264”這個檔案) • File Size: 1,072,094 bytes • Resolution: QCIF (176x144) • 總Frame數: 450 張 (I frame) • Frame Rate: 15 frames per second • 實際在 Versatile 上接收 streaming 並且解碼(ARM+PACDSP)、顯示的效能 • 共需花43秒 • 實際播放速率:450/43 = 10.5 frames/sec • 每秒消耗: 1,072,094/43 = 25 K bytes/sec
Overall Handoff Speed Under Small and Large Internet Delays Small Internet Delay Large Internet Delay
PHY Computational Complexity 註 : 以上為 downlink, 1024-FFT, 使用 6 subchannels, major group = 0 之情形下