layered video over tcpw david chanady, nadeem aboobaker, jennifer wong cs 215 networking...

Layered Video over TCPW

David Chanady, Nadeem Aboobaker, Jennifer Wong

CS 215 Networking FundementalsWinter 2001

March 20, 2001

Goals

• To determine if streaming applications can effectively share network resources when using TCPW

TCPW

• BWE– Original purpose: To determine window size

at TCP layer– Our application: To determine which video

layers to send

Layered Video

• 5 layers, different quality

• Utilize layers according to BWE

Layer 4Layer 3Layer 2Layer 1Layer 0

Layered Video over RTP

• Typical transport for streaming media

Video Server Video Client

RTP RTP

Layered Video over TCPW

Video Server

TCPW

BWE?

To client

BWE

Simulations

• NS2• Topology

5Mb

5Mb

5Mb

5Mb0.3Mb

Video Server

FTP Server

Video Client

FTP Client

Simulations

• Run for 20 seconds– Three different scenarios

• Looking at:– Adaptation of Layered Video server– Fair-sharing of link

Scenario: Simultaneous

• Layered Video starts at 0 seconds• FTP starts at 0 seconds• FTP ends at 15 seconds

Simultaneous Start: BWE

0

50000

100000

150000

200000

250000

300000

350000

Time

bp

s

BWE

Layer 0

Layer 1

Layer 2

Layer 3

Layer4

MAX BW

Simultaneous Start: Jitter

0

200

400

600

800

1000

1200

Time

Jit

ter

(ms

)

Scenario: Layered Video

• Layered Video starts at 0 seconds• FTP starts at 5 seconds• FTP ends at 15 seconds

Layered Video: BWE

0

50000

100000

150000

200000

250000

300000

350000

Time

bp

s

BWE

Layer 0

Layer 1

Layer 2

Layer 3

Layer4

MAX BW

Layered Video: Jitter

0

50

100

150

200

250

300

350

400

Time

Jit

ter

(ms

)

Scenario: FTP

• FTP starts at 0 seconds• Layered Video starts at 5 seconds• FTP ends at 15 seconds

FTP: BWE

0

50000

100000

150000

200000

250000

300000

350000

Time

bp

s

BWE

Layer 0

Layer 1

Layer 2

Layer 3

Layer4

MAX BW

FTP: Jitter

0

200

400

600

800

1000

1200

1400

1600

Time

Jit

ter

(ms

)

Fair Sharing?

FTP Throughpu

t

LVThroughpu

t

TotalBandwidth

Simultaneous

170285.7 113714.3 284000

FTP First 200000 92800 292800

LV First 134400 164800 299200

Future Work

• Create a simple protocol– UDP based– ACKs– No retransmissions– Fair share– BWE calculated using ACK

Conclusion

• BWE • TCP