Research of Transmission and Control of Real-time MPEG-4 VideoStreaming for Multi-Channel Over Wireless QoS Mechanism - PowerPoint PPT Presentation

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Research of Transmission and Control of Real-time MPEG-4 VideoStreaming for Multi-Channel Over Wireless QoS Mechanism

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Research of Transmission and Control of Real-time MPEG-4 VideoStreaming for Multi-Channel Over Wireless QoS Mechanism firecar_at_netopia.knu.ac.kr – PowerPoint PPT presentation

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Title: Research of Transmission and Control of Real-time MPEG-4 VideoStreaming for Multi-Channel Over Wireless QoS Mechanism


1
Research of Transmission and Control of Real-time
MPEG-4 VideoStreaming for Multi-Channel Over
Wireless QoS Mechanism
  • ? ? ?
  • firecar_at_netopia.knu.ac.kr

2
Contents
  • Introduction
  • Wireless QoS mechanism
  • Wireless network real-time video streaming
  • RTP seal for MPEG-4 video streaming
  • RTCP feedback sending code rate control algorithm
    ECN
  • Experiments tests
  • Conclusion

3
Introduction
  • This paper researches a implement of end-to-end
    real-time video transmission system of RTP/UDP/IP
    based on QoS controlling over WLAN.
  • RTP provides the end-to-end network transmission
    function.
  • RTCP uses to examine transmission quality.
  • ECN algorithm based on RTCP feedback rate control
    algorithm-TFRC.

4
Wireless QoS mechansm
  • Wireless network problem
  • Time Delay, high packet loss, high error
    probability
  • ARQ for QoS

5
RTP/RTCP (1/2)
  • Protocol Stack

Application FTP, HTTP, HTTPS, IMAP, IRC, NNTP, POP3, SMTP, SIP, SNMP, SSH, UUCP, RTP
Transport TCP, UDP, SCTP, DCCP, ...
Network IP, IPv4, IPv6, ICMP, ARP, IGMP
Link Ethernet, FDDI, PPP
Physical RS-232, EIA-422, RS-449
6
RTP/RTCP (2/2)
  • RTP ??
  • UDP? TCP? ?? ???? ?? ??, ? ??? ???? ???. ??? UDP?
    ??? ???? RTP? ???.
  • RTP? ? ??? QoS ???? ???? ???? ??.
  • ?? ??? ?? ??? ??? ??? ???.
  • RTCP ??
  • RTP? ??? ???.
  • RTP ??? ??? --gt ???? ? ??? ? ??, RTCP? ? ???.
  • ????? ??? ??, ?? ?? ? QoS ??? ???.
  • RTP ??? ???? ?? ???? ??? ???.
  • 5 ??? RTCP ?? ? ???.

7
ECN (Explicit Congestion Notification)
  • ECN Setup(1)

ECN Negotiated during connection establishment
ECT set
  • ECN enabled sender

ECN enabled receiver
ECN enabled router
ECT ECN Capable Transport
8
ECN (Explicit Congestion Notification)
  • ECN Setup(2)

ECT set

CE set
thmax
thmin
CE Congestion Experienced
9
ECN (Explicit Congestion Notification)
  • ECN Setup(3)

Congestion!!! Let me inform the sender
CE set
ECN enabled sender
ECE set in ACK
ECN enabled receiver
10
ECN (Explicit Congestion Notification)
  • ECN Setup(4)

Congestion reduce cwnd
ECE set ACK
  • ECN enabled sender

ECN enabled receiver
11
ECN (Explicit Congestion Notification)
  • ECN Setup(5)

Incipient Congestion, reduce cwnd, Set CWR
ECN enabled sender
CWR set
ECN enabled receiver
CWR Congestion Window Reduced
12
Wireless network real-time video streaming
  • Multi-Channel transmission model

13
RTP seal for MPEG-4 video streaming
  • MPEG-4 video streaming transmission form

14
RTCP feedback sending code rate control algorithm
ECN
  • The model of ECN algorithm

15
Experiments tests
  • Sending rate and packet loss probability

16
Conclusion
  • Experiments show that the transmission method can
    obtain good quality.
  • Congestion control is used to prevent or reduce
    network throwing package.
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