Wireless Radio Platforms

Transcription

1 Wireless Radio Platforms Mobile Communications Department Eurecom (Collaboration with SoC Laboratory, Telecom ParisTech Sophia)

2 Facts OpenAirInterface Platform: Integrated RF/BB and HW/SW wireless radio platforms for networking experimentations in medium-scale deployments Embedded system based on Leon 3 processor (GNU GPL) Fully reconfigurable architecture (SDR) Target multi-standard and multi-protocol architecture OpenAirInterface Initiative: Collaborative Web tools and Development areas Open-source (hardware and software) wireless technology platforms Target innovation in air-interface technologies through experimentation

3 Prototype Equipment AgileRF/Express MIMO CardBus MIMO I PLATON/RHODOS Cellular Systems Pure Software Radio WCDMA-TDD All-IPv4/v6 Mesh and Cellular Topologies FPGA-SoC (Virtex 2) 2x2 OFDM(A), 2 GHz, 5MHz BW All-IPv6 Mesh, Cellular, P2MP Topologies FPGA-SoC (Virtex 5) + Ext. interfaces Agile RF: Tuning module (0.2 7 GHz) Up to 20MHz BW, 8x8 MIMO OFDM(A)/WCDMA All-IPv6

4 Principal Subject Areas All-IP Wireless Networking Cellular, mesh, P2P, P2MP, and femto-cell network topology Routing, MM, CAC, and QoS support Real-time Radio Signal Processing Agile RF System Design Propagation and System Measurements and their Analysis Cognitive Radio Design and Simulation/Emulation Methodologies

5 Development Areas Cognitive Technologies Wideband RF, Agile Spectrum Management, Interference Management and Control, Distributed/Collabo rative techniques, Spectrum Sensing, Cognitive and Flexible Radio Architectures, Ambient Networking OPENAIR3 : Wireless Networking All-IP, Mobility Management, , Cellular/Mesh Routing Protocols, Mesh Topology Management, Multimodal Radio Resource Management OPENAIR2: Medium-Access Protocols Cellular topologies, single-frequency resource allocation, cross-layer wideband scheduling, Mesh topologies, distributed resource control OPENAIR1: Baseband/PHY Advanced PHY (LTE/802.16x), Propagation Measurement and Modelling, Sensing and Localization Techniques, PHY Modeling Tools OPENAIR0: Wireless Embedded System Design Agile RF design, Reconfigurable High-end Transceiver Architectures, FPGA prototyping, Simulation Methodologies, Software development tools, low-power chip design

6 Collaborative Web Tools SVN Repositories OPENAIR0 (open-source real-time HW/SW) OPENAIR1 (open-source real-time and offline SW) OPENAIR2 (open-source real-time and offline SW) OPENAIR3 (open-source Linux SW suite for cellular and MESH networks) WIKI A TWIKI site for quick access by partners to our development via a collaborative HOW-TO phpbb Forum External support services Bugzilla Doxygen and BSCW

7 Related Projects Madwifi (Multiband Atheros Driver for Wireless Fidelity) Linux kernel device driver for Atheros based WLAN with proprietary HAL, supports PCI, MiniPCI and Cardbus devices Next generation: ATH5K and ATH9K WARP (Wirelsss Open-Access Research Platform) HW/SW open platforms, currently targeting Baseband functionalities in HW using FPGA primitives Embedded system, Xilinx V2-pro, Protocols in SW using PPC GNU Radio Flexible open source SDR, processing offload on host PC Wireless algorithm implementation in SW Based on USRP, ADC/DAC, FPGA, USB Sundance, Lyrtech, BEE2, WiTestLab

8 Content Network Topologies and Architecture Reconfigurable (SDR) Architecture Simulation/emulation platform Open avenues for exploitation and collaboration

9 OpenAirInterface Network Topologies and Protocol Stack NEWCOM++ Winter School on Flexible Radio, RWTH, Aachen, Feb. 4, 2009

10 Current OpenAirInterface Network Topologies Cellular Topology Mesh Topology

11 OpenAirInterface Protocol Stack PHY/MAC 3GPP-LTE like CMM MIPL+ CMM MIPL+ intrach routing RAL Script MPLS interch routing MR L2-IP table User Mode RAL Script MPLS User Mode Neighbor table MPLS IP MPLS IP RRM NAS DRIVER RRC-I NAS DRIVER Kernel RTAI Kernel RTAI RRC PDCP RRC PDCP RLC UM AM TM RLC UM AM TM L-MAC L-MAC PHY PHY

12 OpenAirInterface SDR Architectures

13 OpenAirInterface SDR Architecture: CardBus MIMO I CardBus MIMO I is a front-end for a pure software radio MAC/PHY are RT threads under RTAI L3 networking makes use of Linux networking stack DP-RAM AMBA BUS DCMs 26 MHz TCXO PCI Bus LEON3 CPU GRPCI Standard x86-based PC DMA CNTRL JTAG JTAG CONN INTR CNTRL GPIO RF CNTRL + Expansion DAQ Unit SDRAM CNTRL X2CV SDRAM AD9832 (x2) + Switches Config EEPROM

14 OpenAirInterface SDR Architecture Express MIMO(Collaboration with ENST SoC Lab) SDR on reconfigurable embedded system IDROMEL PLATFORM HW/SW becomes distributed among set of co-processors MODEM application runs under ecos, much like RTAI x86 SDR

15 OpenAirInterface Simulation/Emulation Environment

16 OpenAirInterface Simulation/Emulation Environment Real-time distributed validation environment comprising IP Multicast over Ethernet: PHY emulation layer PHY behavioral abstraction models OpenAirInterface Layer two real-time protocol stack (openair2) potentially virtualized into N inst instances in the same physical machine. Protocol Implementation Validation Virtualization of protocol stacks (L2 + L3) in one machine System Performance Evaluation Hard real-time and soft real-time mode Using real channel measurement traces as simulation stimulus

17 Emulation Example Application Emulated CN OpenAirInterface Real-Time Emulated Cell 1 OpenAirInterface Real-Time Emulated Cell 2 Emulation medium enb Protocol Stack Emulation medium enb Protocol Stack PHY Abstraction CNTL PHY Abstraction CNTL UE Protocol Stack UE Protocol Stack UE Protocol Stack UE Protocol Stack UE Protocol Stack UE Protocol Stack Traffic Model/Generator Traffic Model/Generator Traffic Model/Generator Traffic Model/Generator Application (M2M/Gaming) Application (M2M/Gaming)

18 PHY Emulation Emulated network (either on a distinct PC or in a different MAC instance within one PC) has or shares a kernel module responsible for PHY emulation Fully implements the MAC/PHY interface (Cellular/MESH) transports MAC PDUs via IP Multicast between correspondent nodes or direct memory transfer Generates measurements as would the real PHY Uses a PHY abstraction simulation module to inject simulated error patterns in the different MAC-layer streams PHY Abstraction is done at the receiver of each node Wideband SINR are computed every transmission frame based on the RF topology and pre-defined propagation models The output of the radio simulation is random packet loss indicators for each transport channel block traversing the PHY/MAC interface

19 PHY Emulation

20 EMOS Channel Sounding Eurecom MIMO OpenAirInterface Sounder (EMOS) allows for multiuser/two-way MIMO channel measurements in real time Uses Propagation modelling Offline System capacity analysis based on real-time measurement data Measurement databases for localization algorithm development Characteristics (today) CBMIMO1 hardware 1.9 GHz (5MHz channel bandwidth) 2x2 MIMO channel sounding Full MIMO channel estimate every 2ms dumped in real-time to disk GPS location stamp along with channel estimate data Measured Bit error-rate on rate ½ convolutional-coded QPSK (1 bit/s/hz) OFDM data channel (OpenAirInterface BCH) Two-way and multiuser capability Future (with AgileRF/ExpressMIMO) 200 MHz->8 GHz, 20 MHz channels 4x4 MIMO

21 Contacts Information URL: Partnership and collaboration : openair_admin@eurecom.fr Technical Support: openair_tech@eurecom.fr