"White Spaces" Rules for TV Spectrum Released

On Friday (11/14/2008) the Federal Communications Commission (FCC) released their long-awaited and highly-debated Rules for the development and operation of so-called television band "white spaces" devices to be authorized under CFR 47 Part 15 sub-part H.


The following is excerpted from the FCC's "White Spaces" Order (FCC 08-260) on ET Docket No. 04-186 and ET Docket No. 02-380):

Introduction - Item 10. All Devices. All unlicensed TV band fixed and personal/portable TV band devices will be permitted to operate on TV channels 21-51, excluding channel 37. In addition, fixed TVBDs that only communicate with other fixed TVBDs will be permitted to operate on channels 2 and 5-20, except that they must avoid operation on channels used by private land mobile radio service (PLMRS), i.e., public safety, and commercial mobile radio service operations on channels in certain markets and areas adjacent to them. Also, in individual markets where there are Private Land Mobile Radio Service or Commercial Mobile Radio Service (PLMRS/CMRS) operations on channels 14-20, two channels in the range 21-51 will be reserved for operation by wireless microphones such that TVBDs will not be permitted on those channels. This plan for channel use is consistent with the requests of the various white space proponents and would reserve channels for a "safe harbor" for operation of wireless microphones and ensure protection of the public safety and other land mobile services that use channels 14-20. At this time, we are only permitting fixed TVBDs to operate on channels not that are not immediately next to (first adjacent on either side of) the channel of a TV station; personal portable devices will be allowed to operate on first adjacent channels to a TV station subject to the power limitation indicated above. All unlicensed TV band devices will be required to limit their out-of-band emissions in the first adjacent channel to a level 55 dB below the power level in the channel they occupy, as measured in a 100 kHz bandwidth. In addition, all TVBDs will be required to comply with a more stringent out-of-band emissions band at the edges of channels 36 and 38 that are adjacent to channel 37 in order to protect medical telemetry devices on that channel 37. Fixed devices will also be required to periodically transmit a signal with their identification when they are operating. This will facilitate identification of sources of interference. The database system for fixed stations and personal/portable devices with geo-location and database access capability will be managed by a database manager or managers selected by our Office of Engineering and Technology.

Full text of Order:

http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-08-260A1.pdf


It'll be at least a year or more until any products or services are available to utilize this spectrum (none have been certificated by the FCC as yet and, you can probably count on both proponents and opponents continuing their war of words and legal challenges), so, this might be a good time to suggest that all potential "white spaces" users familiarize themselves with Appendix B of the Order which contains the Final "White Spaces" Rules and the new Part 15 Sub-Part H on Television Band Devices.


NR

FCC Mulls Value vs Efficiency of Licensed vs Unlicensed Wireless Spectrum

After being silent on spectrum matters for almost 5 years, the FCC's OSP (Office of Strategic Planning and Policy Analysis) has issued 3 new working papers on potential spectrum management policy now being evaluated.

Working Paper #41, “Enhancing Spectrum’s Value Via Market-informed Congestion Etiquettes”

Working Paper #42, “Modeling the Efficiency of Spectrum Designated to License Use and Unlicensed Operations,” examine ways in which spectrum designated to licensed and unlicensed use can be more efficiently used.

Working Paper #43, “A Market-based Approach to Establishing Licensing Rules: Licensed Versus Unlicensed Use of Spectrum,” examines the feasibility of employing a market mechanism to determine whether spectrum should be designated to either licensed or unlicensed use.

According to the Commission's press release:

Working Paper #41, “Enhancing Spectrum’s Value Via Market-informed Congestion Etiquettes” and Working Paper #42, “Modeling the Efficiency of Spectrum Designated to License Use and Unlicensed Operations,” examine ways in which spectrum designated to licensed and unlicensed use can be more efficiently used.

Combining economic theory and experimental analysis, Working Paper #41 (and its more theoretical companion Working Paper #42) evaluates the ability of different wireless spectrum congestion etiquettes to promote the efficient use of wireless spectrum in the presence of licensed and unlicensed operations. Under the examined environment, theory predicts that society leaves half of the value it can receive from spectrum “on the table.”

One new approach utilizes various types of user information to address the inefficient use problem. Assuming a close similarity between the naturally occurring environment and the experimental one, analysis reveals that the average efficiency of the existing etiquette employed in most unlicensed equipment is 42%. In comparison, experimental analysis reveals that the average efficiency of one market-informed etiquette - the Informed Greedy Algorithm - is 70%.

This and other results form the factual basis for generating an entirely new type of spectrum allocation wherein a given band of spectrum is treated as a common pool resource in the absence of excessive spectrum congestion, but is treated as an excludable private good in the presence of such congestion.

Working Paper #43, “A Market-based Approach to Establishing Licensing Rules: Licensed Versus Unlicensed Use of Spectrum,” examines the feasibility of employing a market mechanism to determine whether spectrum should be designated to either licensed or unlicensed use.

Working Paper #43 addresses the issue of how best to identify the most desirable allocation rules for spectrum. This OSP paper focuses on issues associated with licensed use and unlicensed operations. Spectrum designated to unlicensed use is made freely available for uses that comply with appropriate technical standards. Spectrum allocated to licensed use is typically assigned to license owners through an auction. Moreover, winners of the auction are granted the right to exclude non-payers from using their spectrum. The allocation between licensed and unlicensed use, however, is based on the FCC’s judgment, which in turn relies on information provided by interested parties seeking to use the spectrum.

One method of reducing the incentive that parties have to exaggerate the value they place on a given licensing regime involves creating a market for such rules. The study examines the feasibility of using a “clock auction” to determine, based on bids submitted by market participants for the corresponding licensing rules, the efficient allocation of a given amount of spectrum between licensed and unlicensed spectrum use. This study finds that market forces, in the form of a clock auction, can be used to determine the efficient assignment of license rules (i.e., those associated with licensed use and unlicensed operations) to spectrum.

If you are at all interested in or concerned about the FCC's future spectrum allocation and management agendas, these papers deserve your attention - and your input. Catherine Bohigian is Chief of the Office of Strategic Planning and Policy Analysis. Elizabeth Andrion is Deputy Chief. The Commission's Chief Economist, Greg Crawford, also makes his home in OSP and he reports to the Chairman on economic issues. Ms. Bohigian, Ms. Andrion, and Dr. Crawford can be contacted by phone at (202) 418-2030.


NR

SDR, CR, DSA, & the 700 MHz Public Safety Band

The folks at the SDR Forum have released a new 23 page report addressing "Considerations and Recommendations for Software Defined Radio Technologies for the 700 MHz Public/Private Partnership" (Technology for 700 MHz Spectrum - Report # SDRF-07-R-0024-V1.0.0) just in time for review prior to the upcoming FCC auction.

Here's a summary:

The report describes how software defined radio (SDR) technologies can help achieve the public/private partnership goals of the upcoming U.S. FCC 700 MHz frequency band spectrum auction. This report also covers cognitive radio (CR) and dynamic spectrum access (DSA) technologies as well.

The context for the report is the Second Report and Order (FCC 07-132, released 10 August 2007) which establishes rules governing wireless licenses in the 700 MHz band. The SDR Forum is uniquely positioned to consider the role of these new technologies in the 700 MHz band since its membership includes commercial mobile radio service providers, public safety representatives, technology developers, systems integrators and equipment manufacturers.

The information and recommendations in the report focusus on technology and related policy considerations to (a) prospective bidders and service providers, (b) potential grantees of the Public Safety Broadband License, (c) equipment manufacturers, and (d) regulators.

Emerging SDR & CR technologies, along with DSA (or DSM - Dynamic Spectrum Management) are believed to be the future of wireless communications.

The report is well worth the time to read for those interested or concerned with spectrum matters.


NR

(Repost)

Managing "Open Access", "White Spaces", & Unlicensed Spectrum

There's more than a few issues and challenges open for consideration and debate when it comes to allowing more and more "open access" and license-free use of the radio spectrum as the authors of this 2005 white paper attempt to point out....

"Managing Shared Access to a Spectrum Commons" (Presented at the IEEE DySpan2005 - Baltimore - November 2005 By William Lehr and Jon Crowcroft)

Abstract

The open access, unlicensed or spectrum commons approach to managing shared access to RF spectrum offers many attractive benefits, especially when implemented in conjunction with and as a complement to a regime of market-based, flexible use, tradable licensed spectrum.

However, as a number of critics have pointed out, implementing the unlicensed model poses difficult challenges that have not been well-addressed yet by commons advocates.

A successful spectrum commons will not be unregulated, but it also need not be command & control by another name. This paper seeks to address some of the implementation challenges associated with managing a spectrum commons. We focus on the minimal set of features that we believe a suitable management protocol, etiquette, or framework for a spectrum commons will need to incorporate.

This includes: (1) No transmit only devices; (2) Power restrictions; (3) Common channel signaling; (4) Mechanism for handling congestion and allocating resources among users/uses in times of congestion; (5) Mechanism to support enforcement (e.g., established procedures to verify protocol is in conformance); (6) Mechanism to support reversibility of policy; and (7) Protection for privacy and security.

We explain why each is necessary, examine their implications for current policy, and suggest ways in which they might be implemented. We present a framework that suggests a set of design principles for the protocols that will govern a successful commons management regime. Our design rules lead us to conclude that the appropriate Protocols for a Commons will need to be more liquid than in the past: (1) Market-based instead of C&C; (2) Decentralized/distributed; and, (3) Adaptive and flexible (Anonymous, distributed, decentralized, and locally responsive).


Offered as suggested background reading and insight in light of the big push for these by the TV "white spaces" proponents, the Cognitive Radio/SDR folks, and the Google's, Intel's, and Microsoft's of the new wireless world.


NR

Dynamic Spectrum Management (DSM) - Regulatory & Allocation Method of the Future?

Radio (RF) spectrum is key to the future success of (wireless) radiocommunications. It is a valuable commodity and a unique, shared resource. Unlike other natural resources, it can be repeatedly reused - if certain technical conditions are met and user regulations are followed.

In practice though, it is a finite resource, accommodates a limited number of simultaneous users, and requires careful planning and management to maximize its value for all services and users — especially since worldwide demand for communication spectrum is increasing rapidly.

Many new wireless technologies present significant challenges to the development of prudent business models as well as to long-established regulatory schemes for spectrum allocation and management.

Rigid spectrum allocation policies limit innovation and cannot readily accommodate pressing needs for more commercial bandwidth. Operators look to evolve technologies that support their business cases. Licensing or policy making that would not allow this natural evolution or mandate a particular technology in a particular band is too rigid for many operators. New generation infrastructure and terminals must support ever wider ranges of frequencies, harmonized or not, to meet highly heterogeneous frequency plans in markets around the world. Terminals will need to operate worldwide and comply with numerous regulatory environments and market opportunities, thus supporting frequency allocation and heterogeneous technologies. New technologies such as software-defined radio (SDR) or cognitive radio (CR), wideband power amplifiers and filters are already available in the infrastructure and will soon be available in terminals, supporting frequency heterogeneity with minimal additional cost.

Within this context, traditional ways to assess the merits of new technical solutions, and allocate and tax frequency use are inadequate. Consequently, this presents major challenges in the introduction of new technologies and efficient spectrum use, such as ensuring new spectrum is only assigned when really needed.

This 2006 Alcatel-Lucent white paper describes a new concept known as DSM (Dynamic Spectrum Management) which would enable wireless operators to dynamically access appropriate spectrum to deliver new wireless services, while providing greater choices for spectrum users. It provides an overview of DSM from the engineering, technology, economic and radio policy aspects and considers critical parameters that impact its implementation.


The paper should be required reading for anyone involved with or concerned about current methods of spectrum regulation and allocation in the U.S., and, perhaps even more importantly, with how any spectrum management methods chosen will ultimately serve to protect this resource from eventual political and economic oversell.


NR

Cognitive Radio Technology for VHF/UHF Public Safety & Business/Industrial LMR

While doing some research for a client recently, I came upon a very interesting paper written earlier this year by Nancy Jesuale and Bernard Eydt titled "A Policy Proposal to Enable Cognitive Radio for Public Safety and Industry in the Land Mobile Radio Bands".

The authors offer some interesting perspectives on the age-old problems associated with LMR system interoperability (a "hot topic" today, particularly when considering the current state of Public Safety radio system interoperability in much of the U.S.), a historical account of FCC and NTIA spectrum regulation and policy, the lack of innovation in frequency allocations, and more.

They also make the suggestion that an emerging new technology known as Cognitive Radio (a term first coined in 1991 by Joseph Mitola) could improve spectrum efficiency and spectrum availability for all users in the VHF and UHF LMR bands. Here is the abstract:


"The frequency bands that have been licensed to the land mobile radio (LMR) services for decades are a tremendously fertile field for the deployment of cognitive radio technology. This paper outlines several reasons why policy-based cognitive radios would be particularly useful for modern public safety, federal non-military and business/industrial applications, especially in the VHF and UHF bands, where 80% of the public safety, federal and business/industrial licenses are currently held.

This paper argues that many interoperability deficiencies are directly related to the original approach to spectrum policy and radio frequency regulation developed in the early 1920's, which segmented uses of LMR spectrum into several use classes. It provides a historic perspective to explain why the current status of LMR infrastructure, operations and licensee behavior is a direct result of antiquated policies and technologies still applied and deployed in these bands. The paper discusses the reasons that cognitive radio could be a successful solution for the apparent congestion in the bands. It suggests that policy-based cognitive radio systems operated on a cooperative, shared basis could lower costs of use and aid coordination for emergency responders across both public and private sectors of the traditional LMR user community.

We discuss policy reforms and innovations such as spectrum pooling and spectrum portability that could spur new shared infrastructure development and spectrum efficiencies. We suggest several key policy reforms for consideration, including immediate cessation of ongoing narrowbanding initiatives, decoupling of spectrum licenses from spectrum access, and national spectrum management by frequency coordinators."


The paper (12 pages) is well worth the time to review for those interested or concerned with spectrum matters.


NR