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U.S. Spectrum Policy and Technology Reform: Toward smarter, wider-band radios and denser network infrastructure Douglas C. Sicker DBC Endowed Professor.

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Presentation on theme: "U.S. Spectrum Policy and Technology Reform: Toward smarter, wider-band radios and denser network infrastructure Douglas C. Sicker DBC Endowed Professor."— Presentation transcript:

1 U.S. Spectrum Policy and Technology Reform: Toward smarter, wider-band radios and denser network infrastructure Douglas C. Sicker DBC Endowed Professor of Computer Science Director of the Interdisciplinary Telecommunications Program College of Engineering and Applied Science University of Colorado at Boulder Executive Director, Broadband Internet Technical Advisory Group (BITAG) (former CTO of the U.S. FCC and CTO of the U.S. Dept. of Commerce NTIA)FIA Athens, GreeceAthens, Greece March 2014March 2014

2 Broad policy reform efforts Technical evolution “Laundry List” of U.S. spectrum policy actions Measurement & data-driven decision making Challenges and opportunities But first a quiz! Overview

3 Why technical policy matters – incumbent’s fight innovation What is this? Hush-a-phone Carterphone First certified WLAN UWBTV Whitespace Device

4 Broad Policy Reform

5 Spectrum Task Force The task force recommended: Advances in technology changing spectrum use Limits of legacy command-and- control regulation Evolve towards more flexible and market-oriented regulatory models. Clear definitions of the rights and responsibilities Use of white spaces can be increased significantly Additional information and measurement is needed in order to more accurately quantify and characterize spectrum usage Interference temperature Published 2003

6 Congressional direction in the Recovery Act led to the creation of the National Broadband Plan Congress said that the plan should: “Ensure that all people of the United States have access to broadband capability and establish benchmarks for meeting that goal.” “[I]nclude... a detailed strategy for achieving affordability... and maximum utilization of broadband infrastructure and service” “[I]nclude... an evaluation of the status of deployment of broadband service” “[I]nclude... a plan for use of broadband... in advancing consumer welfare, civic participation, public safety and homeland security, community development, health care delivery, energy independence and efficiency, education, worker training, private sector investment, entrepreneurial activity, job creation and economic growth, and other national purposes.” Published March 16, 2010 Published March 16, 2010 Because broadband is the great infrastructure challenge of the early 21 st century and US was (is) falling behind the rest of the world

7 7 Spectrum: a important part of the NBP Trends in demand and supply suggest a looming spectrum gap Need to transform spectrum policy to meet demand

8 NBP framework for recommendations Ensure greater transparency in allocation and utilization Make more spectrum available Facilitate deployment of spectrum for wireless backhaul Expand incentives and mechanisms available to reallocate or repurpose spectrum Expand opportunities for innovative spectrum access models Increase comprehensiveness of spectrum policy 5 6 Spectrum Dashboard License View Incentive auctions Spectrum fees 500 megahertz Numerous bands under consideration More flexible rules New unlicensed allocation Opportunistic use R&D Work with NTIA Tribes International Focus on licensed spectrum

9 Spectrum important for U.S. economic and technological leadership Requires 500 MHz of spectrum to be made available for commercial use within 10 years Unlocking the value of otherwise underutilized spectrum Open new avenues for spectrum users to derive value through the development of advanced, situation aware spectrum sharing technologies White House Presidential Memo

10 What are the available spectrum tools? Reallocate: –L–Limited resource (scarcity) –C–Change the use of spectrum (requires time and money) –E–Economics (incentive auctions, 2 nd use, fees) Improve efficiency: –T–Technical (e.g., cellular architecture change, receiver specs and spectral efficiency improvements) Sharing: –M–Many flavors - Geographic, Frequency, Time, Code –W–We have always shared, but now then new technology brings to sharing Let’s start with the allocation problem

11 The Spectrum Allocation Problem It is highly divided, allocated and assigned

12 3-6 GHz band This band appears to be rather crowded, but … GHz

13 When measured It is allocated but not always used - at least not everywhere nor all of the time Usage varies across band, time and location Power (dBm)

14 Time and Frequency “ Holes ” in both the frequency and the time domain These white space opportunities but if done wrong -> Interference

15 Technical Evolution Toward smarter, wider-band radios. Small cell and indoor deployments.

16 SDR (regulatory distinction): a computer that generates and understands radio signals Legacy Radios: defined in hardware Fixed behavior set by operator Adaptively adjusts to accommodate anticipated events Cognitive behavior sense their environment and learn how to adapt Towards a wideband cognitive radio If X > 1, Then MOVE Else STAY Cognitive Radios that sense, learn and adapt Wideband Cognitive Radio – now we need a CR that can operate across a wideband; oh, and do it cheaply, with enough processing power, while moving and without interfering! How are the policy making embracing CR?

17 Sensing Based Sharing Sharing based on Dynamic Frequency Selection (DFS) and derivatives Devices “listen” and perform processing to detect primary

18 Geolocation (e.g.,TVWS) Final rules: – Device identifies its location and accesses a database that tells the device what spectrum is available – Database identifies protected services & locations: Full power TV, low power TV, wireless microphones… – Model is transferrable to other spectrum bands Non- Broadcast spectrum Philadelphia Full Power TV Stations White Space White Space White Space Etc. Low Power TV Only for illustrative purposes Wireless Microphones

19 Clearing spectrum for licensed use Incentive auction Basic idea: - Government “buys” spectrum back from broadcasters - Government “sells” spectrum to mobile broadband carrier (e.g., Verizon and AT&T) - Broadcasters are reluctant to “sell” back to government - Problematic repacking (but doable) Other bands are under consideration to be cleared for licensed use

20 An interesting case study: 1755 – 1850 MHz Reallocation: Analysis – Uses: Airborne Operations (Air Combat Trainings System, Unmanned Aerial Vehicles, Precision‐Guided Munitions, Aeronautical Telemetry), tactical radio, covert surveillance, … – NTIA concluded that the entire 95 MHz can be repurposed but… Findings – $18 Billion – 10 years or more – Move DoD into broadcast spectrum

21 Point-to-Point MW Link Tactical Radio Relay Space Ground Link System Explosive Ordnance Disposal Precision Guided Munitions Air Combat Training Systems Unmanned Aerial Vehicle Air-to-Ground Telemetry Video Surveillance (nationwide) FEDERAL OPERATIONS IN THE MHZ BAND

22 Poster-child for sharing! Use sharing, tolerance, exclusion zones and relocation CSMAC (a federal advisory committee) process underway to convene industry and government in this study Not all 95 MHz desirable by licensed spectrum players

23 1755 – 1850 MHz Airborne Operations (Air Combat Trainings System, Unmanned Aerial Vehicles, Precision‐Guided Munitions, Aeronautical Telemetry) Determine protection requirements for federal operations Understanding of periodic nature and the impact to commercial wireless of government airborne operations Can the new service tolerate the interference of the incumbent and not interfere? What about exclusion zones? New models for Interference Tolerance Question is - can cellular operate around DoD services?

24 PCAST Spectrum Report

25 …clearing and reallocation of Federal spectrum is not a sustainable basis for spectrum policy due to the high cost, lengthy time to implement, and disruption to the Federal mission. The essential element of this new Federal spectrum architecture is that the norm for spectrum use should be sharing, not exclusivity. …spectrum should be managed not by fragmenting it into ever more finely divided exclusive frequency assignments, but by specifying large frequency bands that can accommodate a wide variety of compatible uses and new technologies that are more efficient with larger blocks of spectrum. PCAST high level findings “the PCAST Spectrum Report”

26 Fragmentation of spectrum for exclusive Federal use leads to inefficiency, artificial scarcity, and constraints on current and future users. Immediately identify 1,000 MHz of Federal spectrum in which to implement the new architecture New approach – Cognitive – Agile Radios – Wideband – Small Cell Technologies – New Architecture – Systems design (receiver specs) – New Metric for Utilization Implement a new Federal Spectrum Access System PCAST – high level recommendations

27 “Laundry List”

28 TVWS rollout FCC authorized approved TV white space database systems (2013) Provide service to unlicensed radio devices (TVWS devices) that operate on unused spectrum in the TV bands on a nationwide basis Follows a related action (December 2012) the Commission’s on-line unlicensed wireless microphone registration system for large entertainment, sports, and similar venues where a significant number of unlicensed wireless microphones are used System allows qualifying major event/production venues to register with the database systems so that their operations of unlicensed wireless microphones and other low power auxiliary station devices will be protected from potential interference caused by TVWS devices From concept, to testing, to incumbent registration and now WSD trials

29 TVWS DB testing The FCC is running TVWS DB trials with specific DB operators (2013-) During this trial, participants are encouraged to test: the channel availability calculator the MVPD receive site (cable headend and satellite receive site) registration utility the broadcast auxiliary temporary receive site registration utility the fixed TVWS device registration utility the wireless microphone registration utility The trial is intended to ensure that elements of the database system are working properly and providing the interference protection required under FCC rules -Participants are encouraged to report any inaccuracies or provide comments on other issues with any aspect of the database system This process will allow DB operators to apply corrective measures as needed Testing is progressing along

30 Experimental Radio Service Changes to Part 5 Experimental Radio Service (ERS) 2013 Accelerate the rate that ideas transform from prototypes to devices and services 1.Create new opportunities for researchers to use a wide variety of frequencies for experimentation under a broad research license that eliminates the need to obtain prior authorization before conducting individual experiments 2.Empower researchers to conduct tests in specified locations with pre-authorized boundary conditions through the creation of “innovation zones” 3.Promote advancement in the development of medical radio devices by creating a medical experimental authorization that would be available to qualified hospitals, Veterans Administration (VA) facilities, and other medical institutions 4.Broaden opportunities for market trials by revising and consolidating our rules 5.Promote greater overall experimentation by consolidating and streamlining our existing rules and procedures Make it easier to get and use experimental licenses, while protecting incumbent users

31 Interference Limits FCC TAC explores the concept of an Interference limit ( ) Some equate this to receiver standards -In-band and out-of-band interfering signal levels that must be exceeded before a radio system can claim that it is experiencing harmful interference (inspired by Receiver standards and OFCOM’s SUR) -Statistical : a threshold is exceeded if the observed signal strength exceeds the stated value for more than some percentage of locations and times, at some specified confidence level An interesting concept but difficult to enact

32 Measuring Mobile FCC Mobile BB Speed App – extends “Sam Knows” ( ) Measuring Broadband America 2013 – FCC speed test app for Android 2014 – FCC speed test app for iPhone Same interface and technologies Challenging privacy issues (Deep commitment to PII or UII collected) Contributes information to the public on the nation’s mobile broadband performance There are some differences between apps: iOS app cannot run periodically in the background; need to run tests manually Step toward furthering network measurement

33 MSS Spectrum Satellite spectrum converted to (co-exist with) mobile services (2???) Lots happening Globalstar petitioned the FCC to operate FDD LTE service in parts of its spectrum band spanning and MHz (channel 14 spanning 2473 – 2495 MHz)

34 3.5 GHz Spectrum Access System in the 3.5 GHz Band ( ) Recent proposal to make at least 100 megahertz of spectrum available for shared small cell use in the MHz band The NPRM proposed the creation of a dynamic Spectrum Access System (SAS) to govern interactions between and among devices in the 3.5 GHz band Three tiers of access - Incumbent Access; Priority Access; and General Authorized Access Workshops explored the technical requirements, architecture, and operational parameters of the SAS Recently FCC sought additional comments SAS extends earlier concepts tied to TVWS; builds on PCAST efforts

35 5 GHz Battles in 5 GHz – U-NII and ITS bands ( ) Many bands in play: -U-NII-1: GHz, Indoor use only, 50 mW -U-NII-2: GHz, outdoor & indoor, Dynamic Frequency Selection (DFS), 250mW -U-NII-2e: GHz, outdoor & indoor use, DFS, 250 mW -U-NII-3: to GHz, U-NII / IS, 1W (WISPs) -ITS band: GHz, dedicated short-range communications for vehicles Many players -Auto industry wants guarantee that unlicensed users not interfere with auto collision-avoidance system that sit in 5.9 GHz -Vendors and ISPs say this is 75 MHz of underutilized spectrum; need to remove restrictions on indoor use of band and allow for higher powers -Battle between cellular and Wi-Fi over LTE-A in unlicensed bands -Globalstar uses the 5.15 GHz spectrum for MSS feeder links -ISPs want to expand for ac -Wider use of Wi-Fi in the GHz and GHz bands -More … Very interesting space to watch!

36 Inter-Service Interference Checking Evaluating new methods FCC looking to create a new predictive model ( ) Methods to define thresholds of coverage and interference with engineering specifications to create a predictive model (tends toward overly conservative methods)

37 60 GHz FCC modified Part 15 of its rules for intentional radiators operating on an unlicensed basis in the GHz frequency range (2013) 1)Allow higher emission limits for 60 GHz devices that operate outdoors with very high gain antennas to encourage broader deployment of point-to-point broadband systems 2)Specify the emission limit for all 60 GHz devices as an EIRP power level to promote repeatability of measurement data and provide uniformity and consistency in the rules 3)Eliminate the requirement for certain 60 GHz devices to transmit identification information (transmitter ID) Rules allow longer communication distances for unlicensed 60 GHz point-to- point systems that operate outdoors; thereby extend the ability of such systems to provide broadband service Other interesting work happening in the THz range Backhaul and direct BB access

38 RF Exposure FCC Report and Order (Order), Further Notice of Proposed Rulemaking (Notice) and Notice of Inquiry (Inquiry) on RF exposure (2013) Order – minor regulations implementing NEPA (Environmental Protection) and NHPA (Historic) Notice – propose to update and revise procedures and treat all services equally Inquiry – determine whether RF exposure limits and policies need to be reassessed Proceeding does not reach the issue of whether exposure limits are appropriate Delay decision making because of lack of record

39 MISC – Architecture, Enforcement, WRC 15 Enforcement will be a challenge VARIOUS OTHER ITEMS ( ) Architecture: FCC encouraging new architectures for most efficient use of the radio spectrum – Cloud, SDN, C-RAN and Small-cell Enforcement: Numerous challenges as we move toward new spectrum models and tools. Less resources, harder problems. Also great opportunity – e.g., in automation through dense deployment of cheap spectrum analyzers with feedback to DB WRC 15: Let’s skip this one!

40 Measurement & Decision Making National Broadband Map License View Spectrum Dashboard SamKnows

41 National Broadband Map

42

43 License View

44 Spectrum Dashboard

45 Challenges and opportunities…

46 Where are we making progress? Policymakers are embracing trends toward – Small cell – SDR/CR – Wideband/multiband – Sharing – Database and sensing – Additional unlicensed – Thinking about systems approach (e.g., Harms Claim Threshold) – Data focused Technology is progressing but more work needed – Need for additional R&D – Better HW & SW; better models, methods and measurements – Where’s the market? – What enforcement model (security models)? – What are the incentives? – What else do the Regulators need to do?

47 Better HW & SW (reconfig HW, DSP, sensing, multi-band…) –Affordable, dynamic receivers that can move around in a wide band with high channel selectivity Sensing versus GeoDB – in a world of high protection ratios –“Dumb” detectors can't match performance of a matched filter –Broadcasters want protection below kTB, not practical, hence GeoDB Incumbents demand high detection probability (Pd), which drives false alarm probability (Pfa) high - more sophisticated time-frequency signal processing (cyclostationary) improves the situation...but at what cost? Proper operation – ensuring the GeoDB system –Progress is being made, but focus required on coordination, validation, security… Processes for detecting, identifying, locating, mitigating and reporting interference sources; building confidence that the applicable rules and regulations regarding such sharing will be enforced Which Bands? Are we focusing on the wrong spectrum? –Most attention on.6-6 GHz, but 6-90 GHz ( and beyond) might be a better focus Some basic challenges remain

48 Thank you

49 Spectrum Sharing Partnership Steering Committee – an Advisory Committee of Industry Representatives – to Advise on Federal Spectrum Sharing System Implementation Scalable Real‐World Test Services – (a Test City and Mobile Test Service) to test Federal Bands and Public Safety Release R&D Wireless Innovation Fund (WIN) ‐ Appropriated in 2012 Payroll Tax Agreement Formalize the White House‐based Spectrum Management Team (SMT) Support International Harmonization of new Shared Federal Bands Implement a Mechanism that gives Federal Agencies Incentives to Share Spectrum (e.g., Spectrum Currency) Redefine Spectrum Relocation Fund to Revolving “Spectrum Efficiency Fund” Experiment with new shorter term licensing models PCAST – detailed recommendations

50 Developing meaningful coexistence models Better measurement, modeling and thresholding – a system Application aware closed coupling models Realtime measurement My personal interests - Coexistence Modeling

51 Modeling Propagation Questions: Which is right? What about actual measurements? What about realtime measurements? Images courtesy of Dale Hatfield

52 Measured versus Modeled Question: How do we measure?

53 Thresholds Matter Slides courtesy of Matthew Oetting (and EDX) 2 dB!


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