Research BytesResearch Bytes

Bob KinickiBob Kinicki

October 13, 2006October 13, 2006

Network ProtocolsNetwork Protocolsandand

Wireless NetworksWireless Networks

Research Bytes October 13, 2006 3

Streaming VideoStreaming Video

Ser ver Cl i ent

Video Frames

Net wor k Cl oud

Slide courtesy of Huahui Wu

MediaPlayerMediaPlayer™™ vs. vs.

RealPlayerRealPlayer™™ A A

Comparison of Network Comparison of Network

TurbulenceTurbulence

Research Bytes October 13, 2006 5

0

100

200

300

400

500

600

700

0 50 100 150 200 250

Time (seconds)

Ban

dwid

th (

Kbit

s/se

c.)

Real Player (284K)

Real Player (36K)

Windows Media Player (323K)

Windows Media Player (49K)

Real vs WMP Playout RateReal vs WMP Playout Rate

RealPlayer buffers at a higher rate

Research Bytes October 13, 2006 6

Streaming Video over Wireless

Streaming Video over Wireless

Ser verCl i ent

Video Frames

Wired network AP

Research Bytes October 13, 2006 7

Wireless Streaming Multimedia Lab

Topology Wireless Streaming Multimedia Lab

Topology

IDC

Windows 2003 server(saco)

Windows media server Real streaming Server Quick time Darwin Windows IIS server Ethereal

DVD DVD Player

VCR

Video Camera

Mobile station(yangtze)

WM Tracker Real Tracker Ethereal

Wireless sniffer(seine)

Ethereal Monitor Mode

Access point Video capture

NAT Router(streamit)

WPI Campus Network

Emulated Internet

1 2 3 4 5 6

7 8 9101112

AB

12x

6x

8x

2x

9x

3x

10x

4x

11x

5x

7x

1x

Eth

erne

t

A

12x

6x

8x

2x

9x

3x

10x

4x

11x

5x

7x

1x

CHub

1 2 3 4 5 6

7 8 9101112

AB

12x

6x

8x

2x

9x

3x

10x

4x

11x

5x

7x

1x

Eth

erne

t

A

12x

6x

8x

2x

9x

3x

10x

4x

11x

5x

7x

1x

C Switch

NFS Server(york)

Packet Sniffer(merlot)

Media Client(???)

WM Tracker Real Tracker Ethereal

Slide courtesy of Mingzhe Li

Research Bytes October 13, 2006 8

Wireless Measurement StudyWireless Measurement Study

Slide courtesy ofFeng Li

Research Bytes October 13, 2006 9

Frame Retries and Packet Loss

Frame Retries and Packet Loss

Figure 7: Wireless Layer Retry Fraction

Figure 8: UDP Ping Loss Fraction

AP queuecauses highpacket loss

Research Bytes October 13, 2006 10

Rate Constrained TFRCRate Constrained TFRC A seven-hop chain network was simulated. The TFRC sending rate is manually constrained. The MAC layer saturates at 300Kbps.

Wireless Sensor Wireless Sensor Networks (WSNs)Networks (WSNs)

Research Bytes October 13, 2006 12

Camalie VineyardsCamalie Vineyards

Case Study in Case Study in Crossbow Mote Crossbow Mote

Deployment Deployment

Copyright 2006 Camalie Vineyards, Not to be reproduced without written permission

Research Bytes October 13, 2006 13

Water in the VineyardWater in the Vineyard

Research Bytes October 13, 2006 14

Vineyard InstallationVineyard Installation• At each Mote location:

• 2 soil moisture sensors • 12” and 24” depth• 1 soil temp sensor to calibrate soil moisture sensors

Research Bytes October 13, 2006 15

Power SupplyPower Supply

2 month max battery life now with 10 minute sampling interval

Decided to use solar power, always there when doing irrigation. Solar cell $10 in small quantities though and need a $.50 regulator.

Research Bytes October 13, 2006 16

Vineyard Mote Prototype

Vineyard Mote Prototype

• 433MHz Mica2dot• Solar power supply• Up to 6 resistive sensor inputs

Research Bytes October 13, 2006 17

Network MapsNetwork Maps

Irrigation Block Map

13 nodes late 05, Now 18 nodes

Research Bytes October 13, 2006 18

Soil Moisture DataSoil Moisture Data

Red = 12” depth soil moisture Green= 24” depth soil moisture Note delay deeper More frequent, shorter watering keeps water shallow

Research Bytes October 13, 2006 19

WSNs for Assisted LivingWSNs for Assisted Living

Berkeley Fall Detection SystemAlarm-Net

University of Virginia

Research Bytes October 13, 2006 20

WSNs for Assisted LivingWSNs for Assisted Living

Research Bytes October 13, 2006 21

WSNs for Assisted LivingWSNs for Assisted Living

Two-TieredWSN

Architecture

Research Bytes October 13, 2006 22

Berkeley Fall Detection System

Berkeley Fall Detection System

Research Bytes October 13, 2006 23

Berkeley Fall Detection System

Berkeley Fall Detection System

Research Bytes October 13, 2006 24

Thank You !!Thank You !!

CorksCorks