Communication between Wireless Sensor Devices and GNU Radio

1
Communication between Wireless Sensor Devices and
GNU Radio

• Gaurav Konchady
• Sriram Sanka

2
Outline

• Wireless Sensor Networks
• Motes
• GNU Radio as Base-station
• CC1000 RF Transceiver
• IEEE 802.15.4 Standard
• Block Diagram
• Results

3
Wireless Sensor Networks

• Network of Spatially distributed sensor devices
• Two tiered architecture
• Sensor and Base-station nodes

4
Types of Motes

• TelosB, MICA2 and MICAz to be used in project
• Motes programmed in TinyOS software platform
• Other OSs include SOS, Contiki, Mantis, etc.

5
GNU Radio as Base-station

• Interoperability with heterogeneous motes
• Wideband nature of USRP enables multichannel
  communication
• Flexibility in selection of modulation scheme

6
CC1000 RF Transceiver

• Frequency range 300 1000 MHz
• FSK modulation with 76.8 kBaud max
• Manchester encoding
• Integrated bit-synchronizer

7
TinyOS CC1000 Frame Format

• TinyOS and SOS CC1000 frame formats have
  different fields
• Requires changes in CC1000 modulator and
  demodulator blocks in GNU Radio

8
IEEE 802.15.4 Standard

• MAC and Physical layer protocol for
  short-distance, low-power, low-data-rate wireless
  communication
• 128 byte maximum MAC frame size
• 2400 MHz to 2483.5 MHz frequency range
• DSSS employing O-QPSK modulation

9
TinyOS 802.15.4 T-frame

• T-frame differs from the original IEEE 802.15.4
  frame format
• Requires modifications to 802.15.4 modulator and
  demodulator blocks in GNU Radio

10
Project Setup

• MICA2 mote sends data to USRP (FLEX400)
• USRP extracts payload from CC1000 frame
• Payload inserted in an 802.15.4 T-frame
• T-frame transmitted by USRP (RFX2400)
• Packets received by TelosB mote

11
Block Diagram
12
Goals Accomplished

• Detecting 802.15.4 frame on USRP using RFX2400
  daughterboard
• MICA2 to USRP communication
• TelosB to USRP communication
• MICA2 to TelosB communication via USRP
• Future work
• TelosB to MICA2 communication via USRP

13
Results

• MICA2 output
• USRP output
• TelosB base-station output

14
References

• IEEE 802.15.4-2006 standard, http//standards.ieee
  .org/getieee802/802.15.html
• Thomas Schmid, GNU Radio 802.15. 4 En-and
  Decoding, http//nesl.ee.ucla.edu/fw/thomas/thomas
  _project_report.pdf
• TEP 125 TinyOS 802.15.4 Frames,
  http//tinyos.cvs.sourceforge.net/checkout/tinyo
  s/tinyos-2.x/doc/html/tep125.html
• CC1000 datasheet, http//www.cse.ohio-state.edu/si
  efast/nest/nest_webpage/datasheet/Chipcon20-20CC
  100020Data20Sheet20v2.1.pdf

15
Thank you

• Questions?