1

Mobile WiMAX Transmission and Handover with Video Stream

ing– Real-Time Software Impleme

ntation on DSP and PCJoint work of the following labs:

Prof. David W. Lin – CESP Lab, Prof. ChingYao Huang – WINTech LabDept. 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 fromthe National Science Council of R.O.C.

and the Institute for Information Technology, Taipei, Taiwan, under a project sponsored by MOEA, R.O.C.

2

Logical System Structure

SIP proxy 1

Domain 1 Domain 2

SIP proxy 2

Switch

Video Server

MS

Gateway

BS1

switch

BS 2

3

PHY Architecture

Tx FilterFEC

+Framing

1 DSP

Rx

Rx FilterDeFEC

+DeFraming

Sync.+

Chan. Est.

2 DSPs

Tx

Rx FilterDeFEC

+DeFraming

Sync.+

Chan. Est.

2 DSPs

Tx FilterFEC

+Framing

1 DSP

ChannelSimulator(AWGN,SUI 1-6,ETSI_A)

Rx

Tx

Downlink

Uplink

1 DSP

(DSPs are TI TMS320C6416Ts housed on Sundance DSP boards)

4

MAC Architecture

(Implemented on Linux PC)

5

H.264 Decoding on PACDSP Platform

Entropydecode

(slice data)

Reorder

Q-1T-1

MC

Intraprediction

Filter

F’n(reconstructed)

F’n(refererence)

Entropydecode

(sps/ pps/ sh)

DFT

IQ/ ITDF

ED

PPC

MPUMPU

DMADMA

DSPDSP

NALNAL

Entropydecode

(slice data)

Reorder

Q-1T-1

MC

Intraprediction

Filter

F’n(reconstructed)

F’n(refererence)

Entropydecode

(sps/ pps/ sh)

DFT

IQ/ ITDF

ED

PPC

MPUMPU

DMADMA

DSPDSP

NALNAL

6

Fast SIP Handoff

(Implemented on Linux PC)

7

Video Streaming System Parameters

Video RTP ServerRTP 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

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Video Decoding SpeedH.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 bytesResolution: 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

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Overall Handoff Speed Under Small and Large Internet Delays

Small Internet Delay Large Internet Delay

10

PHY Computational Complexity

Module Equiv. # of C6416Ts at 1 GHz

Tx_PHY( U-PHY, FEC, Framing & IFFT )

0.82

Tx_Filter 0.25

Channel Simulator (AWGN) (SUIs)

(ETSI_A)

0.821.522.56

Rx_Filter 0.54

Sync (include FFT) + Chan. Est. 0.23

Rx_PHY( U-PHY, DeFEC & DeFraming )

1.16

註 : 以上為 downlink, 1024-FFT, 使用 6 subchannels, major group = 0之情形下