Towards an Open Source IEEE p Stack

Transcription

1 Towards an Open Source IEEE p Stack Bastian Bloessl Computer and Communication Systems Group, University of Innsbruck, Austria February 2014 FOSDEM SDR Dev Room Brussels, Belgium

2 Outline Introduction Wireless Measurement and Experimentation IEEE p Transceiver Applications Bastian Bloessl Towards an Open Source IEEE p Stack 2

3 Improved SDR Platforms Hardware {B,N}210 HackRF BladeRF GNU Radio VOLK Async. Messages OFDM Reference Design Standards DVB-T LTE WiFi Bastian Bloessl Towards an Open Source IEEE p Stack 3

4 SDR in EE and CS Electrical Engineering Signal processing Receiver design Signal propagation Computer Science Network protocols Network simulation Security / Privacy Example: Vehicular Networks Bastian Bloessl Towards an Open Source IEEE p Stack 4

5 Vision: Vehicular Ad Hoc Networks Bastian Bloessl Towards an Open Source IEEE p Stack 5

6 IEEE p Standard Standardized in 2011 Dedicated spectrum Adaption of WiFi OFDM 64 subcarriers 10 MHz bandwidth Problem: Designed for indoor environments Pilots Data Bastian Bloessl Towards an Open Source IEEE p Stack 6

7 Current Experimental Platforms Prototypes Cohda MK2 Adapted WiFi cards Unex DCMA-86P2 Atheros Limited Information / Blackbox Bastian Bloessl Towards an Open Source IEEE p Stack 7

8 IEEE p Transceiver Bastian Bloessl, Michele Segata, Christoph Sommer and Falko Dressler, "Towards an Open Source IEEE p Stack: A Full SDR-based Transceiver in GNURadio," Proceedings of 5th IEEE Vehicular Networking Conference (VNC 2013), Boston, MA, December 2013, pp Bastian Bloessl Towards an Open Source IEEE p Stack 8

9 Transceiver Design Layered Design Hierarchical Blocks Extendable Wireshark Linux TCP/IP App MAC PHY Socket MAC OFDM No changes to FPGA HW USRP TX USRP RX Bastian Bloessl Towards an Open Source IEEE p Stack 9

10 Application Interface Connect to SDR via TCP/UDP sockets Bastian Bloessl Towards an Open Source IEEE p Stack 10

11 Interoperability IEEE a/g MacBook Pro Intel Ultimate N6300 Air Live X.USB IEEE p Cohda Wireless MK2 Unex DCMA-86P2 Atheros-based Bastian Bloessl Towards an Open Source IEEE p Stack 11

12 Limitations of GPP-based Platform Ping Tun / Tap GNU Radio 100ms delay RTS / CTS Acknowledgments Duration Field Bastian Bloessl Towards an Open Source IEEE p Stack 12

13 Carrier Sensing and Channel Access CSMA on PC has too high delay Noise 32.9us OFDM Frame CSMA on FPGA is feasible A. Puschmann, P. Di Francesco, M. A. Kalil, L. A. DaSilva, and A. Mitschele-Thiel, Enhancing the Performance of Random Access MAC Protocols for Low-cost SDRs, in 8th International Workshop on Wireless Network Testbeds Experimental Evaluation and Characterization (WiNTECH 2013). Miami, FL: ACM, September Bastian Bloessl Towards an Open Source IEEE p Stack 13

14 Applications Bastian Bloessl Towards an Open Source IEEE p Stack 14

15 Fuzzing Form of penetration testing Send random, cluttered, non-standard frames See what happens to the device / driver / firmware If fuzzing doesn t solve your problem, you re not doing enough of it Bastian Bloessl Towards an Open Source IEEE p Stack 15

16 Privacy and Fingerprinting EE CS Channel features Characteristics of analog HW Traffic patterns (when, where, packet size, ) MAC address / temporary identity SDR Implementation details of chip / firmware / driver Bastian Bloessl Towards an Open Source IEEE p Stack 16

17 Enabling Realistic Simulations Measurement results Coherence bandwidth Coherence time Channel taps Network simulation Frame Error Curves OFDM interference channel models + gr-ieee = Bastian Bloessl Towards an Open Source IEEE p Stack 17

18 in Conclusion Bastian Bloessl Towards an Open Source IEEE p Stack 18

19 Conclusion SDR-based IEEE p OFDM transceiver Modular and extensible Many applications Open Source Bastian Bloessl Towards an Open Source IEEE p Stack 19

20 Other Projects gr-rds Radio Data Service FM Radio gr-ieee ZigBee 2.4GHz O-QPSK PHY Presentation: CC-BY-SA Title photo: CC-BY Wikipedia user Nudelbraut Bastian Bloessl Towards an Open Source IEEE p Stack 20