slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Video Multicast over the Internet PowerPoint Presentation
Download Presentation
Video Multicast over the Internet

Loading in 2 Seconds...

play fullscreen
1 / 32

Video Multicast over the Internet - PowerPoint PPT Presentation


  • 145 Views
  • Uploaded on

Video Multicast over the Internet. Bell Lab. And Georgia Institute of Technologies IEEE Network · March/April 1999. Presented by: Liang-Yuh Wu Lung-Yuan Wu Hao-Hsiang Ku. 12 / 6 / 2001. Agenda. 1. Abstract 2. Basic idea 3. Single-stream video multicast

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Video Multicast over the Internet' - bowie


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

Video Multicast over the Internet

Bell Lab. And Georgia Institute of Technologies

IEEE Network · March/April 1999

Presented by: Liang-Yuh Wu

Lung-Yuan Wu

Hao-Hsiang Ku

12 / 6 / 2001

slide2

Agenda

1. Abstract

2. Basic idea

3. Single-stream video multicast

4. Replicated-stream video multicast

5. Layered video multicast

6. Replicated vs. Layered

7. Error Control

8. Concluding Remarks

slide3

Abstract

Why?

  • Multicast of video / future network service

Video Conference

Distance Learning

Remote Presentation

Media-on-Demand ( MOD,VOD )

  • Lacks support for QoS assurance
  • Heterogeneity of the Internet transmission

 Problem of “ Real time & Bandwidth”

slide4

Focus & Discussion ??

Base requires for Multicast video :

  • Mechanisms for Multicast data delivery
  • Ability to accommodate Real-time video

Focus on:

  • 1.How real-time video can be accommodated

over Internet

2.Fairness

slide5

Some general approaches and issue

(Real-time):

---Delay jitter, Data loss

1. Using QoS reserve resources

2. Using adaptive rate control “ Feedback

mechanism ”

3.Buffering

4.Change compression parameters

5.Error control technology

slide6

Basic idea

  • Video Bit-Rate adaptation
  • Adaptive Bit-Rate Video Multicast Options

1. Single Stream Adaptive Approach

2. Replicated Adaptive Streams Approach

3. Layered Video Streams Approach

single stream video multicast
Single-stream Video Multicast
  • The IVS Approach (in the H.261 encoder)
  • Feedback information is based on packet loss measured at the receiver
  • Packet loss is detected using RTP (Real-time Transport Control)
  • RTP sends “reception reports” that provide feedback information
single stream video multicast cont
Single-stream Video Multicast(cont.)
  • Feedback implosion problem
    • Probabilistic multicast technique
    • Probing mechanism
  • Can’t provide fair treatment to multiple receiver in a heterogeneous environment
  • Tradeoff between multicast and unicast
replicated stream video multicast
Replicated-Stream Video Multicast
  • The DSG (Destination Set Grouping) Protocol
  • The goal of the DSG:
    • To improve fairness over a single-group feedback-controlled video multicast
    • To address “scalability”
  • By transmitting video of differing quality and differing data rate on different multicast channels and allowing receivers to select the most appropriate one.
replicated stream video multicast cont
Replicated-Stream Video Multicast(cont.)
  • The DSG protocol has two main Components:
    • Intra-stream protocol
    • Inter-stream change protocol
  • A DSG experiment result :
    • Fairness among receiver is improved significantly over a single-group approach while incurring only a small additional bandwidth overhead.
layered video multicast
Layered Video Multicast
  • Video layering can be supported by many video compression techniques
    • EX: MPEG-2 supports layered encoding by defining four scalable modes
  • Layered Video Multicast Protocol
    • Receiver-driven Layered Multicast (RLM)
    • Hierarchical Rate control (HRC)
receiver driven layered multicast
Receiver-driven Layered Multicast
  • Receiver-based control
    • Advantage:
      • burden of adaptation is moved from the sender to the receiver
  • Join-experiment
    • result is successful
    • result is failed
receiver driven layered multicast cont
Receiver-driven Layered Multicast(cont.)
  • The key to scalability in layered multicast is “adding or dropping a layer”
  • Shared Learning
    • Advantage:
    • Disadvantage:
      • unnecessary bandwidth and message processing overhead
      • Too much state information
hierarchical rate control hrc
Hierarchical Rate control (HRC)
  • Layered Video Multicast with retransmissions (LVMR)
    • two key contributions:
      • retransmitting lost packets
      • adapting to network congestion and heterogeneity using HRC
  • Hierarchical Rate control (HRC)
    • to distribute the information between the sender, receivers, and some agents
    • each entity maintains only the information relevant to itself
hierarchical rate control hrc cont
Hierarchical Rate control (HRC)(cont.)
  • Comparing with RLM:
    • allow receiver to maintain minimal state information
    • decrease control traffic on the multicast session
    • multiple experiments to be conducted simultaneously
    • drop the correct layer(s) during congestion in most case
hierarchical rate control hrc cont1
Hierarchical Rate control (HRC)(cont.)
  • In addition to avoid the above drawback of RLM
    • Comprehensive group knowledge base
    • Collaborative layer drop
      • decrease layer oscillation
      • achieves more effective rate adaptation
      • maintains better video reception quality
    • Add-layer experiment
      • decrease unnecessary add-layer experiment
      • provide smoother video quality
replicated stream vs layered video
Replicated-stream VS. Layered video
  • For video multicast, layering is determined more by the coding requirements than by the bandwidth requirements
  • Replicated-stream VS Layered video:
    • bandwidth economy
    • Processing overhead
error control
Error Control

1.Layered Video Multicast with Retransmission (LVMR)

2.Structure-Oriented Resilient Multicast (STORM)

3.Client-Server Architecture

the key idea in lvmr
The Key Idea In LVMR
  • Use a statically configured logical tree
  • Set Designated Receivers (DRs) at each level
  • Improve efficiency by no asking for retransmission
  • Improve response time by sending immediate message and multicast retransmissions
  • Use Buffers
  • Combine retransmission mechanisms
the key idea in strom
The Key Idea In STROM
  • Each receiver to dynamically select the best possible DR
  • Use a dynamically logical tree
  • Receiver decide the latency or reliability
the steps of storm
The Steps of STORM
  • 1.Build the recovery structure
  • 2.Selection of Parent Nodes
  • 3.Adapting the structure
the key idea in client server architecture
The Key Idea In Client-Server Architecture
  • Separate the actual senders and receivers.
  • Receiver either get the original or repaired video stream.
  • The retransmit server and the repair server can be organized into LVMR
  • Using RTP
  • Repair Buffer
concluding remarks
Concluding Remarks
  • Network congestion lead to degrade the video quality.
  • Non-adaptive streams of video data don not share resource well in a best-effort network.
future work
Future Work
  • To build a mechanisms which provide for the co-existence and resource sharing of video multicast stream .
  • Formalization of the notion of fairness
  • Understanding the effect of pricing on the behavior of receiver in a multicast video environment.
slide32

The End

Thank you so much!!