WIRELESS NETWORKS IN A POST-SPECTRUM WORLD

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Transcription:

NSF workshop Nov. 2013 1 WIRELESS NETWORKS IN A POST-SPECTRUM WORLD Henning Schulzrinne FCC/Columbia University

NSF workshop Nov. 2013 2 Overview A bit about the FCC The role of research: another broader impact vector? What has changed in the last ten years? What questions do policy makers ask? The FCC incentive auction New frontiers for spectrum sharing: 3.5 GHz What data sources are available?

NSF workshop Nov. 2013 3 THE FCC IN 5 MINUTES

NSF workshop Nov. 2013 4 Why policy & regulators? Market failure private monopoly e.g., pre-divestiture BOCs as local phone companies competitive market failures (e.g., duopoly, consumer rights) merger reviews (e.g., Comcast + NBC, AT&T + T-Mobile, T-Mobile + MetroPCS) social policy objectives (e.g., disability rights, universal access) Law enforcement illegal conduct (consumer/subsidy fraud, misrepresentation, ) unsafe conduct ( no fence around antenna ) Consumer education information asymmetry (e.g., lemon laws ) Economic development public goods (e.g., scientific research)

NSF workshop Nov. 2013 5 The US hierarchy of laws Constitution Commerce clause Law Section 8: To regulate Commerce with foreign Nations, and among the several States, and with the Indian Tribes (1787) SEC. 706. ADVANCED TELECOMMUNICATIONS Telecom Act 1934 & 1996 47 CFR INCENTIVES. (a) IN GENERAL- The Commission shall encourage the deployment on a reasonable and timely basis of advanced telecommunications capability to all Americans (including, in particular, elementary and secondary schools and classrooms) by utilizing, in a manner consistent with the public interest, convenience, and necessity,, or other regulating methods that remove barriers to infrastructure investment. Narrative reasonable network management

NSF workshop Nov. 2013 6 FCC Chairman (D) Tom Wheeler 4 Commissioners (2 D, 2 R) International Media Consumer and Governmental Affairs Enforcement Public Safety & Homeland Security Wireless Telecommunications Wireline Competition Independent federal agency About 1,700 employees

NSF workshop Nov. 2013 7 Staffing at National Regulatory Agencies

NSF workshop Nov. 2013 8 Example: CFR 47 15.5 General conditions of operation. (a) Persons operating intentional or unintentional radiators shall not be deemed to have any vested or recognizable right to continued use of any given frequency by virtue of prior registration or certification of equipment, or, for power line carrier systems, on the basis of prior notification of use pursuant to 90.35(g) of this chapter. (b) Operation of an intentional, unintentional, or incidental radiator is subject to the conditions that no harmful interference is caused and that interference must be accepted that may be caused by the operation of an authorized radio station, by another intentional or unintentional radiator, by industrial, scientific and medical (ISM) equipment, or by an incidental radiator.

NSF workshop Nov. 2013 9 Policy inputs Prior actions (e.g., VoIP definition) Court cases (Brand X, Comcast, ) Economic analysis (competition, investment, consumers) Law (1934 & 1996 Act) Policy Other impacts (social policy objectives, fraud risk, )

NSF workshop Nov. 2013 10 Process NOI Notice of Inquiry NPRM Notice of Proposed Rule Making R&O Report & Order comments, replies & ex parte Petition for reconsideration rarely Federal court review

NSF workshop Nov. 2013 11 CS research: new avenues what s happening in the real world? how well does X really work? what are the downsides of X? how much can future technology help? what are fundamental limits?

NSF workshop Nov. 2013 12 THE POST-SPECTRUM WORLD

NSF workshop Nov. 2013 13 100% of research on narrow part of spectrum Transportation 4G Mobile Broadband Private Fixed and Mobile Critical Infrastructure Scientific Uses Medical Devices Public Safety; Homeland and National Security Wireless LANs Unlicensed Devices Broadcasting Satellite Services Machine to Machine 13

NSF workshop Nov. 2013 14 Post-spectrum world Old (pre-2000) Mostly single-use, application-specific allocations ( radar, LMR, paging ) Mostly federal OR nonfederal use Each band its own world Static usage Limited spectral efficiency concerns Go west (up), young application! Now No more unallocated bands (below 30+ GHz) multiuse, generic transport Shared federal & nonfederal use Neighbor issues (GPS, TV) Usage may change (satellite mobile) Spectral efficiency but how measured? (bits/s/hz/km 2?) Limited ability to go to higher frequencies

NSF workshop Nov. 2013 15

NSF workshop Nov. 2013 16 Licensing Methods Commercial Mobile Radio Services: Auctions FCC has auctioned spectrum licenses since mid-90s Enhanced competition & growth of wireless services Spectrum auction receipts to U.S. Treasury Over $50 billion since 1993 Over $30 billion in past 5 years Various other licensing methods (examples): Licensed by rule Public safety spectrum Citizen s band Medical devices Family radio service First-Come-First Served Private Land Mobile Services Point-to-Point Microwave Services

NSF workshop Nov. 2013 17 What are Spectrum Incentive Auctions? Incentive auctions are a voluntary, market-based means of repurposing spectrum by encouraging licensees to voluntarily relinquish spectrum usage rights in exchange for a share of the proceeds from an auction of new licenses to use the repurposed spectrum. Currently: TV in VHF (54-88 MHz, 174-216 MHz) & UHF (476-698 MHz) 298 MHz Cellular in 700 MHz, 800 MHz, 1.7 GHz, 2.1 GHz, 2.5 GHz ~500 MHz Unlicensed data use mainly in 2.4, 5.8, 60 GHz

Broadcast Incentive Auction: Key Components 1 Broadcasters Offer to relinquish spectrum usage rights 1. Broadcaster Options 2. Reverse Auction Design 3. Repacking of Broadcast Stations 4. Forward Auction Design 5. 600 MHz Band Plan 6. Integration of Forward and Reverse Auctions 7. Unlicensed Use/TV Whitespaces NSF workshop Nov. 2013 18 5 Mobile Broadband Providers Offer to purchase spectrum licenses 2 3 4 Reverse Auction Integration 6 Forward Auction 7

NSF workshop Nov. 2013 19 Band plan general idea TV Channel Number 14 37 51 LMR TV Channels Lower Guard Band 600 MHz Downlink Channel 37 TV Channels Upper Guard Band 600 MHz Uplink 700 MHz Uplink X cleared Y cleared Frequencies in MHz 470 608 - X 608 614 698 - Y 698 Amount of spectrum available is auction-dependent: X cleared (downlink) and Y cleared (uplink) Uplink located at channel 51 (698 MHz) and expands downward Downlink located at channel 36 (608 MHz) and expands downward 5 MHz blocks proposed, paired wherever possible 6 MHz guard bands proposed, available for unlicensed use

NSF workshop Nov. 2013 20 Effect of Repacking Channel Change Service Impacts 21 50 21 Service POP A (Old) Service POP A (New) 21 Service POP B (Old) Interference (POP C) Service POP B (New) Station on Ch 50 receives new allotment on Ch 21 Potential for service loss from cochannel interference New interference must not reduce population coverage by more than 0.5%

NSF workshop Nov. 2013 21 Thoughts on spectrum sharing Predictable, accountable, securable, generalizable, manageable efficiency and elegance is nice, but may not be first But need to better understand all the pieces can fit together not just sensing, but management and prediction what s the value of spectrum that s only available sometimes? What happens if a federal user complains about interference? How can we find whether the problem is real? What happens if indoor-only devices migrate outdoors? Can we truly make some bands add ons, best effort only? multi-band future Not: band management by Congress

NSF workshop Nov. 2013 22 Example: 3.5 GHz see also TVWS, MBAN 100 MHz at 3.550 GHz + (maybe) 3.65-3.7 GHz incumbents: DoD radars + fixed satellite service (FSS) receive-only exclusion zones: 60% pop. unsuitable for macrocell access: incumbent, priority, general authorized hospitals, utilities, state/local gov t

NSF workshop Nov. 2013 23 Measuring Broadband America - Mobile Accurately measure US mobile broadband performance In collaboration with 4 major carriers Data will be public (after summarization to remove identity) Gathers: phone identity, carrier, location (cell, GPS) HTTP GET, HTTP POST, UDP latency https://github.com/fcc/mobile-mba-androidapp

NSF workshop Nov. 2013 24 Conclusion Need research input but closed loop works better than publish-and-pray Need more what s really out there research what s the actual spectral efficiency? where and how is mobile data used? how well does 802.11 work outside the home? how much of the unlicensed spectrum is used where? what kind of systems can co-exist? location services for emergency calling indoors & outdoors From components to systems at scale Questions & data at http://www.fcc.gov/blog/researchersuseful-datasets-and-potential-questions

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