CONTENT DELIVERY IN AD-HOC WIRELESS NETWORK

TEAM

Adviser : Dr. Lei Ying

Research Assistant: Ming Ouyang

Team Members: Prashanth Yanamandra Wyatt Brenneman Taylor McKechnie

Client: ECpE Department

Iowa State University Ames, IA, 50010

PROJECT ABSTRACT

Wireless connectivity has become popular in our everyday life and the ability to exchange information is increasing just as fast.  Examples of technologies implementing ad-hoc networks include Wi-Fi, Bluetooth and Zigbee.

Our goal is to establish communication between USRPs, USRP and TelosB Sensors and Sensor to Sensor using Zigbee protocol (IEEE 802.15.4) . This protocol operates at 2.4GHz broadcasting frequency. We will be implementing a star network topology for our sensor networks. We also aim to print useful data obtained from the sensors

CONCEPT SKETCH

FUNCTIONAL REQUIREMENTS

Streaming of Wireless Sensor Data throughout Network System will allow wireless sensor motes to stream sensor data to the USRP backbone of our

system. The data will be propagated to other wireless motes through the USRP backbone.

Simultaneous Streaming The fully functional system must be capable of supporting 10 simultaneous streams at any

instant of time. The wireless motes require a unique ID # when programmed so sensor data can be tracked to the specific sensors.

Utilize the Zigbee 802.15.4 Protocol Our network will be operating in the 2.4 – 2.4835 GHz band, which is the worldwide band for

Zigbee. We will be utilizing channel 16 of this band, which is at 2.48 GHz center frequency.

Broadcasting range The system must be able to provide good reception in a close range.

NON FUNCTIONAL REQUIREMENTS

Physical Dimensions The dimensions of the sensors will need to be small enough to

be implemented in classrooms and labs without needing to change any layout of the room. The dimension of the USRP is fixed.

Equipment Protection The equipment is placed indoors at all times and does not

require weather protection.

Power Requirements The USRP and the USRP2 need an AC to DC converter. The

sensors will need 2 AA batteries to supply power.

HARDWARE CONSIDERATION

RFX2400 Transceiver Daughterboard on the USRP Operates at 2.4 GHz frequency (operating frequency of

the sensors) Capable of sending and receiving data packets using 1

antenna TelosB sensors

Operate at 2.4GHz frequency and can be easily integrated in to the system

Provide voltage, temperature and light sensors on one mote

SOFTWARE CONSIDERATION

GNU Radio Open source software development toolkit offering

wide variety of signal processing techniques Linux

Supports the GNU Radio and the Zigbee protocol TinyOS

OS for sensors which uses nesC, similar to C syntax allows component blocks to be tied together

RISKS AND MITIGATION

RISKS MITIGATION

Sensor failures Bad data transmission Device Failure

Easily available sensors to replace

Device and sensor overlap

TOP LEVEL APPLICATION CLASS

TOP LEVEL APPLICATION CLASS CONTD.

TOP LEVEL APPLICATION CLASS CONTD.

RECEIVE CLASS

TRANSMIT CLASS

TRANSMIT CLASS CONT AND MAIN LOOP

TESTING

USRP to USRP testing

Data packets will be transmitted from 1 USRP and will be received by the other USRP

Content of a transmitted data packet is verified with content of received data packet

USRP TX/RX TEST RESULT

TESTING

Sensor to USRP testing

Data will be sent from the wireless sensor and will be received by the USRP

Received data packets will be printed to the screen

SENSOR TX AND USRP RX RESULT

TESTING

USRP to Sensor testing

Data packets are transmitted from the USRP to the Sensor

Sensor receives the data packets and confirms the reception by blinking a light

USRP TO SENSOR RESULT

TESTING

Sensor to Sensor testing Wireless sensor transmits light, voltage, temperature

data to a base station (TelosB mote connected to a laptop) as data packets

Base station receives data packets and converts data packets to information and prints to the screen

TEST RESULTS

Data recorded by the light sensors

EVALUATION

Data will be transmitted from a TelosB sensor to an USRP

Received sensor data will be printed to the screen

USRP will transmit the received data to another USRP

EVALUATION

Received data will be printed to the screen and verified with transmitted data to check for error free transmission

Data will be transmitted from USRP to the sensor

This multi-hop transmission will check system functionality correctness

TIME DIVISION

25%

23%25%

12%

15%

Testing

Research

Implementation

Documentation

Design

PROJECT COST

PRODUCT NUMBER OF UNITS

COST/UNIT TOTAL

USRP (Only Kit) 2 $ 700 $ 1,400

USRP2 (Only Kit) 3 $ 1400 $ 4,200

Accessories (Daughter Board, Antennas)

5 $ 310 $ 1,550

LAPTOPS 5 $800 $4,000

SENSORS 20 $ 139 $ 2,780

SD Cards & Card Readers

3 $ 20 $ 60

WORK HRS. 450 $20/Hour $9,000

TOTAL $ 22,990

OVERALL PROJECT SCHEDULE

FUTURE WORK

Create TinyOS applications to utilize the sensor network

Adapt Python script to accept and forward Zigbee packets of any size

Work to increase broadcast range of sensors

Create tutorial that can be used for classroom teaching

THANK YOU