Experiences with multimedia streaming over 2 5g and 3g networks
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Experiences with Multimedia Streaming over 2.5G and 3G Networks. J. Chesterfield, R. Chakravorty, J. Crowcroft, P. Rodriguez, S. Banerjee Presented by Denny Iskandar. 1. Introduction. What? Evaluates performance of multimedia streaming over wireless network. Why?

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Experiences with Multimedia Streaming over 2.5G and 3G Networks

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Experiences with multimedia streaming over 2 5g and 3g networks

Experiences with Multimedia Streaming over 2.5G and 3G Networks

J. Chesterfield, R. Chakravorty, J. Crowcroft, P. Rodriguez, S. Banerjee

Presented by Denny Iskandar


1 introduction

1. Introduction

  • What?

    • Evaluates performance of multimedia streaming over wireless network.

  • Why?

    • 2.5G and 3G technologies are being deployed everywhere (Europe, America, and Asia)

    • Popularity of multimedia applications such as videoconferencing, Voice over IP, and audio/video broadcasting


1 introduction1

1. Introduction

  • Scope of experiment

    • Measurements from real networks:

      • The effect of heterogeneity of network is captured by comparison across different network technologies: (GSM), GPRS, and UMTS.

      • Describes the importance of cooperation between network and application using an application called vorbistreamer.


Roadmap

Application layer

Presentation layer

Session layer

Transport layer

Network layer

Data link layer

Physical layer

Roadmap

  • Introduction

  • Network measurements

  • Application measurements

  • Conclusions


2 network measurements

2. Network Measurements

  • Multimedia traffic characterization

    • Assume layered organization of media

    • Bandwidth used ranges between a minimum and a maximum target rate.


2 network measurements1

2. Network Measurements

2.1Propagation delay and jitter


2 network measurements2

2. Network Measurements

2.1Propagation delay and jitter


2 network measurements3

2. Network Measurements

2.1Propagation delay and jitter

  • Compare with ITU recommendation for voice communications: RTT ≤ 500 ms

  • Note:For GPRS, disabling ARQ reduces jitter at the cost of higher packet loss rate (around 3%).


2 network measurements4

2. Network Measurements

2.2Capacity variation


2 network measurements5

2. Network Measurements

2.2Capacity variation


2 network measurements6

2. Network Measurements

2.3Summary

  • Propagation delay and delay jitter are reduced as link capacity increases.

  • GPRS should disable ARQ for multimedia application.

  • Sub-packet error detection [1] improves performance.

[1]J. Chesterfield, R. Chakravorty, S. Banerjee, P. Rodriguez and I. Pratt. Transport Level Optimisations for Interactive Media Streaming Over Wide-Area Wireless Networks. In WiOpt ’04, 2004.


3 application measurements

3. Application Measurements

  • Use Vorbis codec

    • A layered codec, encodes data into a base layer and enhancement layers


3 application measurements1

3. Application Measurements

  • Design of vorbistreamer

    • Implements IP-based data striping; this is used to aggregate channel bandwidth.

    • Uses RTP as transport protocol.

    • Supports interactivity constraints from fully interactive communication to one-way streaming.

    • Uses Vorbis codec.


3 application measurements2

3. Application Measurements

  • Encoding techniques

    • For multimedia application, reliability is disabled

    • Needs to add redundancy to multimedia data to facilitate receiver-based repairs

    • Also involves interleaving of encoding blocks to reduce the effect of error burst


3 application measurements3

3. Application Measurements

3.1Intra-packet redundancy (UEP)

Vorbis frame

Header

Base layer

EL1

EL2

...

ELn

FEC1

FEC2

frame1

n-2 frames

RLC packets

FEC blocks


3 application measurements4

3. Application Measurements

  • Things to note:

    • This “bucketing” is done at application layer, the actual RLC packetization is done at link layer.

    • Multiple layers in one packet to minimize header overhead.


3 application measurements5

3. Application Measurements

3.2Inter-packet redundancy

  • Cross-packet coding

    • Sends parity data in separate packets than the original data.

original data

parity data

d

  • The greater d is:

  • The more effective recovery

  • The greater recovery delay


3 application measurements6

3. Application Measurements

3.2Inter-packet redundancy

  • Cross-channel coding

    • From tests, it is more likely that error occurs to A and B than to B and C

A

B

channel 1

C

channel 2


3 application measurements7

3. Application Measurements

3.3Interleaving

  • Intra-packet: change the order of frames in the same packet

  • Inter-packet: change the order of packets in the same channel

  • Inter-channel:

5

7

3

1

channel 1

6

8

4

2

channel 2


3 application measurements8

3. Application Measurements

3.4Comparison


4 conclusions

4. Conclusions

  • The need for cooperation between network and application.

  • Encoding and organization of multimedia data is important.

  • Benefits from aggregating independent channels.

  • Benefits from sub-packet error detection.


5 related works

5. Related works

[1]J. Chesterfield, R. Chakravorty, S. Banerjee, P. Rodriguez and I. Pratt. Transport Level Optimisations for Interactive Media Streaming Over Wide-Area Wireless Networks. In WiOpt’04: Modelling and Optimization in Mobile, Ad Hoc and Wireless Networks, 2004.

[2]R. Chakravorty, J. Chesterfield, P. Rodriguez and S. Banerjee. Measurement Approaches to Evaluate Performance Optimizations for Wide-Area Wireless Networks. In Passive and Active Network Measurement (PAM 2004) 5th International Workshop, 2004.


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