Wireless Networks and Communications. 24 September 2013

Transcription

1 IIT WiNCom Wireless Networks and Communications Research hcenter 24 September 2013

2 RF Spectrum Observatory, at IIT, Chicago, IL Antenna location Motivation Commercial? Ongoing, Increasing Spectrum Need 50 Mbyte/mo. 1.5 Gbyte/mo. FCC National Broadband Plan (2010) seeking 500 MHz spectrum President s s Council (PCAST) (2012) seeking 1000 MHz spectrum State and Local Government Federal Government (NTIA) Only spectrum sources Only spectrum sources - Increased spectral efficiency (4G LTE) - Re-allocation (e.g. 700 MHz) - Sharing (Dynamic Frequency Selection, Dynamic Spectrum Access)

3 WiNCom Mission Increased Access to RF Spectrum / Improve Efficiency for Commercial and Government Uses Research Themes Technologies and Insights for more efficient i (intense) use of RF spectrum - Dynamic Spectrum Access / Spectrum Sharing - Innovative Spectrum Technical Policy (Interference Limits) RF Environment Characterization Deep understanding of actual RF spectrum utilization Interference Identification / Mitigation Understand RF Co-Existence Criteria

4 WinCom: Faculty, Students Computer Science Dennis Roberson, Res. Prof. Cindy Hood, Assoc. Prof. Jesse Taylor Ryan Attard ECE Miles Wernick, Professor Ken Zdunek, Adj. Professor S h B k S L Suresh Borkar, Sr. Lecturer Tanim Taher, PhD Candidate Roger Bacchus, PhD Candidate Mandana Noroozi, PhD Candidate Abed Arnaout Peter Chinetti Marriyam Qureshi Ali Riaz Ali Riaz Emilie Woog Philip Felber

5 WiNCom: Wireless Networks and Communications Research Center Sponsored Research (partial) Wireless System Interference ; Impact on Connectivity (NSF) Spectrum Observatory System; Chicago Spectrum Observatory (NSF) Wireless Sensor Networks 2011 (Exelon Nuclear) DSA for Mission Critical Communications (NSF) Multisite Spectrum Observatory Network (EARS) (NSF) Global Spectrum Opportunity Assessment (EAGER) (NSF) Modeling & Analysis of Radar/Comms Spectrum Sharing Opportunities (NSF) Accomplishments Over 40 Publications Regular DySPAN, CROWNCOM and ISART Contributors Chicago Observatory: 6+ years of continuous Measurements MHz Use of Dataset for Quantitative Analysis of Cognitive Radio and Network Performance - P Marshall MHz Band Occupancy (T-Mobile USA) FCC Tech Transfer; FCC TAC; Commerce Dept CSMAC; PCAST Spectrum Policy Proposal Technology Transfer - RF Spectrum Observatory Architecture Spectrum Analysis Software Technology Transfer RF Spectrum Observatory Architecture, Spectrum Analysis Software Roberson and Associates (Spin-Out) Numerous company contributions Multi-City RF Spectrum Observatory Network (Microsoft)

6 Selected Industry and University Collaborators and Sponsors

7 WiNCom Spectrum Observatories IIT Tower Chicago Mobile 6+ years Harbor Point (Motorola)

8 7 Measurement Systems Multiple Experiments Long-term wideband 60 s period variable RBW Auxiliary 1 Hz 12.5 khz RBW High-fidelity LMR 0.25 s period 6.25 khz RBW

9 Multi-site Observatory Network - Federal Bands Focus 1 mile Proposed NEW RF Spectrum Observatory Network 1 mile RF Measurement Storage and Analysis Capability RF Measurement Storage / Archive Utilization Analysis Utilization Visualization Existing RF Spectrum Observatory at IIT, Chicago

10 IIT WiNCom Collaboration: NTIA-ITS Boulder, CO ITS: Institute of Telecommunication Sciences Nationwide RF Survey - RSMS: Radio Spectrum Measurement System - IIT facilitated RF Spectrum measurements in Chicago - Student and ITS Seminar and Technical Information Exchange September 2012 Measurement at IIT Federal Street (2 week duration)

11 IIT Technology Transfer: Microsoft Spectrum Observatory

12 WinCom Measurement Systems Three measurement systems & six devices Main observatory (IITSO) Spectrum analyzer based MHz Land Mobile Radio (LMR) 3x Universal Software Radio Peripheral (USRP) 2 units Specific bands (e.g MHz) Secondary observatories 2x RC sensors Currently scanning LMR bands Harbor point + IIT Tower Secondary observatory (Harbor Point) IITSO + LMR systems (IIT Tower) ~ 4 miles

13 IITSO: System Overview

14 IITSO Example: Digital TV Switch-over

15 IITSO: Occupancy Findings Occupancy: average spectrum over Occupancy: average spectrum over time/frequency where detectable power exceeds threshold Threshold based on noise floor Min/max based on daily averages Limited to signals originating north of the observatory Vicinity of downtown Point-to-point signals hard to measure

16 IITSO: Sample Occupancy Findings 14 % average occupancy in 2009 (up to 3 GHz)

17 IITSO: Sample Occupancy Findings 15 % average occupancy in 2010 (up to 3 GHz)

18 VIDEO: Novel method to Visualize changes in Spectrum Occupancy

19 LMR for public safety: Findings from Chicago blizzard of 2011 Record Chicago Snowfall: ~ 0.75 m. 1-Feb-2011 (tues) PM 2-Feb-2011 (wed) (still snowing) (snowed in)

20 Motivation: Police vs other LMR band occupancy differences High public safety occupancy and low commercial occupancy High public safety occupancy and low commercial occupancy o Week-day nights o Weekends o During record snow-storm (Feb. 1-2, 2011)

21 During normal operation: Chicago Police Dept (CPD) occupancy time-seriesi 25 khz FM channels, 9 s. time resolution (data from 2009)

22 WiFiUS Spectrum Occupancy Data Center

23 WiFiUS Observatory in Chicago 1(+) RFeye analyzer Complex Band Plan Harbor Point + Mobile + IIT

24 Questions?