An over-the-air reconfiguration API for cognitive radio testbeds - PowerPoint PPT Presentation

Wireless Innovation Forum European Conference 2011 An over-the-air reconfiguration API for cognitive radio testbeds Moritz Fischer, Martin Braun, Jens P. Elsner, Friedrich K. Jondral Communications Engineering Lab Prof. Dr.rer.nat. Friedrich K. Jondral KIT – University of the State of Baden-Wuerttemberg and www.kit.edu National Research Center of the Helmholtz Association

Outline Cognitive Radio Brief introduction to over-the-air reconfiguration What is it? How does it fit into the CR context? Implementation Requirements of a CR testbed Soft- & Hardware Results Component Integration Example meter (sensor) Demonstration Moritz Fischer- An over-the-air reconfiguration API for cognitive radio testbeds 2 11.05.2011 Communications Engineering Lab Prof. Dr.rer.nat. Friedrich K. Jondral

COGNITIVE RADIO Moritz Fischer- An over-the-air reconfiguration API for cognitive radio testbeds 3 11.05.2011 Communications Engineering Lab Prof. Dr.rer.nat. Friedrich K. Jondral

Cognitive Radio – In a nutshell 2000: Mitola coins the term Cognitive Radio in his Ph.D. thesis Cognitive Radio according to SDR Mitola User centric Intelligent Adaptive Cognitive A fusion of Radio SDR Artificial Sensors / Awareness Awareness Intelligence Artificial Intelligence Moritz Fischer- An over-the-air reconfiguration API for cognitive radio testbeds 4 11.05.2011 Communications Engineering Lab Prof. Dr.rer.nat. Friedrich K. Jondral

SHORT INTRO TO OVER-THE- AIR RECONFIGURATION Moritz Fischer- An over-the-air reconfiguration API for cognitive radio testbeds 5 11.05.2011 Communications Engineering Lab Prof. Dr.rer.nat. Friedrich K. Jondral

Over-the-air-reconfiguration - Introduction Components Components Master Master Terminal Terminal  Multiple radio terminals  Master  Slave Waveform Waveform  Common (known) waveform A B Components Components  Master decides to change waveform  Two cases:  Both terminals know the waveform  Transmit parameters Waveform Waveform  Only one terminal knows the A B waveform  Transmit waveform Slave Slave Terminal Problem Components Terminal  Adding new components at runtime Moritz Fischer- An over-the-air reconfiguration API for cognitive radio testbeds 6 11.05.2011 Communications Engineering Lab Prof. Dr.rer.nat. Friedrich K. Jondral

Over-the-air reconfiguration – Security Source code Components  Transmitted source code needs privileges (hardware access) Transmission over the air Components  Data integrity  User authentification  Possibly secrecy Solution Components  Run different parts of the system in seperate processes  Cryptography  Hash functions  Digital Signatures Moritz Fischer- An over-the-air reconfiguration API for cognitive radio testbeds 7 11.05.2011 Communications Engineering Lab Prof. Dr.rer.nat. Friedrich K. Jondral

Over-the-air reconfiguration – CR context Often neglected Components  For Communications we need at least two terminals CR autonomously selects waveforms Components  Partner needs to be notified → OTAR becomes necessary CR autonomously creates waveforms Components  Decisions are based on knowledge (History, Environment)  The developed waveforms differ! → OTAR becomes necessary Moritz Fischer- An over-the-air reconfiguration API for cognitive radio testbeds 8 11.05.2011 Communications Engineering Lab Prof. Dr.rer.nat. Friedrich K. Jondral

IMPLEMENTATION Moritz Fischer- An over-the-air reconfiguration API for cognitive radio testbeds 9 11.05.2011 Communications Engineering Lab Prof. Dr.rer.nat. Friedrich K. Jondral

Implementation – Requirements Analysis Security Components  Data integrity  User authentication Scalability Components  Adding new components has to be simple  Meters / sensors  Artificial intelligence  RF frontend Flexibility Components  Run different parts in separate processes  Try to avoid limitations imposed on new components  Programming language  Operating system Moritz Fischer- An over-the-air reconfiguration API for cognitive radio testbeds 10 11.05.2011 Communications Engineering Lab Prof. Dr.rer.nat. Friedrich K. Jondral

Implementation – Software used GNU Radio Components  Signal Processing Framework  Free Software  Mostly PHY Layer  Integration of RF Frontend  Modulator / Demodulator GNU Privacy Guard Components  Framework for cryptography (RSA, AES, SHA- 1…)  Free Implementation of RFC 4880  Cross Platform D-Bus Components  „ low-latency, low-overhead, easy to use IPC“  Part of the freedesktop.org project  RPC, Signals, Asynchronous Programming Moritz Fischer- An over-the-air reconfiguration API for cognitive radio testbeds 11 11.05.2011 Communications Engineering Lab Prof. Dr.rer.nat. Friedrich K. Jondral

Implementation – Component Integration Overview Components  Two domains  Cognitive Engine not implemented  CR  Reconfiguration Controller  Environment  configures SDR  Connections via D-Bus  Protocol for reconfiguration Moritz Fischer- An over-the-air reconfiguration API for cognitive radio testbeds 12 11.05.2011 Communications Engineering Lab Prof. Dr.rer.nat. Friedrich K. Jondral

Implementation – Reconfiguration Controller Protocol Parser Components  Contains Protocol  simple, line based  FSM  exchangeable Module Manager Components  Availability of the modules / waveforms  Security  Signatures  Hashes Moritz Fischer- An over-the-air reconfiguration API for cognitive radio testbeds 13 11.05.2011 Communications Engineering Lab Prof. Dr.rer.nat. Friedrich K. Jondral

RESULTS Moritz Fischer- An over-the-air reconfiguration API for cognitive radio testbeds 14 11.05.2011 Communications Engineering Lab Prof. Dr.rer.nat. Friedrich K. Jondral

Results Components Framework  Testing and implementing CR Terminals  Easy integration of new components  Waveforms can be developed in GNU Radio Demonstrator Components  OTAR Reconfiguration  Three example waveforms  Audio streaming  Video streaming  Narrowband FM Moritz Fischer- An over-the-air reconfiguration API for cognitive radio testbeds 15 11.05.2011 Communications Engineering Lab Prof. Dr.rer.nat. Friedrich K. Jondral

Q&A / Discussion Communications Engineering Lab Prof. Dr.rer.nat. Friedrich K. Jondral KIT – University of the State of Baden-Wuerttemberg and www.kit.edu National Research Center of the Helmholtz Association