SpectrumTalk

The independent blog on spectrum policy issues
that welcomes your input on the key policy issues of the day.

Our focus is the relationship between spectrum policy
and technical innnovation.

Nationwide Unlicensed TV Whitespace Use at Last!

WS-PN-3-13

In the above public notice FCC announced the availability of TV white space operation in all US territory. Even though the TV whitespace proceeding has been underway for almost a decade, actual use depended on database administrators being approved and then specific areas being approved. As the PN states,

Previously, OET had authorized database systems to only provide service to TV white space devices in the East Coast region, specifically in the states of New York, New Jersey, Pennsylvania, Delaware, Maryland, Virginia, and North Carolina and in the District of Columbia (Washington, DC).


We now have nationwide availability for the first time.

In a related matter, on February 27 FCC announced a 45-day public trial of Google Inc.’s TV band database system. Spectrum Bridge, Inc. and Telcordia Technologies, Inc. were previously approved as database administrators.
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Industry Canada Acts on TV White Space

IC TVWhiteSpace-October2012-cover
Today, Industry Canada, the FCC’s Canadian counterpart with respect to spectrum policy, published its TV whitespace decision after its rulemaking process. As in the US they will allow unlicensed whitespace devices in TV spectrum subject to geolocation and a database check. Like in the US they will have multiple database administrators.

Here is part of the decision:

The management of the radio frequency spectrum has traditionally been a centralized process, with the access to spectrum overseen by a regulatory body. However, as technology has progressed, methods allowing dynamic spectrum access have begun to be developed to improve spectrum efficiency. A shift away from conventional licensing approaches could lead to a more flexible, adaptive administrative environment by enabling opportunistic use of the radio frequency spectrum. Such techniques for the use of TVWS have the potential to improve spectrum efficiency while facilitating the introduction of new wireless communications applications in Canada.

Some respondents express some apprehension about the introduction of TVWS devices due to the potential for rapid proliferation, especially in the context of licence-exempt operation among licensed systems. On the other hand, appropriate technical requirements and the ability of these devices to adapt their operation in real time should ensure that incumbent users do not suffer harmful interference. Industry Canada believes that the regulatory approach described in this document will provide the necessary measures to address these concerns.

Industry Canada will also closely monitor international regulatory developments, and will make appropriate regulatory changes as further experience is gained. It is noted that TVWS rules in the United States have been finalized and remaining legal obstacles to related TVWS deployment have been resolved. The development of rules and regulations for TVWS use are also moving quickly in many other countries, including in the United Kingdom, where rules development is particularly advanced.

Despite the potential that repurposing of some TV spectrum below 698 MHz in the United States might lead to calls for similar action in Canada, Industry Canada does not see this as a reason to delay the introduction of TVWS devices. If Canada were to follow the United States, available spectrum would be reduced and fewer geographical areas would be available for the operation of TVWS devices. However, proponents have indicated their belief in the ongoing viability of TVWS use regardless of whether such changes take place.

It is expected that the introduction of the use of TVWS devices will enable the development of new techniques for managing the radio frequency spectrum while easing spectrum shortages and enabling more options for wireless broadband and Internet services for consumers.

It is unclear if Industry Canada has decided to use the same obsolescent R-6602 propagation model that FCC used and that overprotects TV reception or is using a mode accurate model or has just deferred the issue for further consideration. More later.
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Adaptrum TV White Space Unit Approved

ws grant

On April 19, the traditional Patriot’s Day in my home state of Massachusetts and the anniversary of the “shot heard round the world” that started the American Revolution, FCC approved the equipment authorization application of Adaptrum, Inc. for a TV white space device for unlicensed use in the UHF-TV band under the rules adopted in Docket 04-186.

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Adaptrum ACRS 1.0 White Space Device

The unit was approved as shown above for the frequency range 473.0 - 695.0 MHz, TV channel 14-51, and a transmitter power of 0.617 W. The approval include permission for use of antennas with a gain up to 10.15 dBi, so the device is capable of the maximum 36 dBm, almost 10 dB higher than the only other device that has ever been approved.

Nottoway

Adaptrum also announced a field test of its equipment in rural Nottoway County Virginia. This is an economically challenged area with little broadband connectivity due to disinterest of the mainstream carriers and lack of appropriate technical options in the past. Adaptrum hopes to show how white space technology can improved connectivity in such an area.

Adaptrum, founded in Silicon Valley in 2005, is MSS’ oldest client and we are proud to have played in a key role in assisting them to reach this point.

Adaptrum press release

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TV Whitespace Progress

FCC had a holiday present for the TV whitespace community. On Thursday an FCC press release announced:

Today, the Federal Communications Commission issued a Public Notice announcing that the Office of Engineering and Technology (OET) has approved Spectrum Bridge Inc.’s television white spaces database system, which may provide service to devices beginning January 26, 2012. OET has also approved a device by Koos Technical Services, Inc. (KTS) as the first product allowed to operate on an unlicensed basis on unused frequencies in the TV bands. The KTS device will operate in conjunction with the Spectrum Bridge TV band database.


The database announcement says the database approval is effective January 26, 2012. NAB reported some problems during testing and asked for both more testing and another round of comments. FCC rejected the need for more comments but required that the problems identified to date be fixed. However, the initial implementation of the database will be limited to “ to the Wilmington, NC market, specifically to the city of Wilmington and New Hanover County, NC” due to problems with the FCC registration system for nonbroadcaster high density wireless microphone usage sites such as concerts. Your blogger has serious doubts whether the FCC provision for registering these wireless miss will be practical. Time will tell.

KTS-grant
Above is the first equipment authorization approval granted to Florida’s Koos Technical Services, a firm that seems to have some partnership with Spectrum Bridge. While the Commission’s Rules do not forbid this type of relationship, one wonders if anyone ever thought about it from the policy viewpoint.

The FCC grant is surprising in that the approved spectrum is not UHF, but rather 177-213 MHz in the upper VHF band. This is the middle of channel 7 to the middle of channel 13. The device’s manual states that “it is designed to provide a reliable wireless connection for digital communication in selected TV bands in the 174 – 216 MHz (VHF) or 470 - 698 MHz (UHF) frequency ranges.” The manual also states the power amplifier “provides up to 1 Watt (30 dBm) of RF output power” - but the approved power limit is 0.1 Watt. The manual states the data rate is “1.5 or 3.1 Mb/s” with a 6 MHz channel bandwidth. Indeed the test reports KTS submitted to FCC repeatedly mention “Transmit power 25 dBm” or 0.316 W, yet the authorized power is 0.1 W. So it is clear that the parameters that were approved are not the ones in the original submittal to FCC.

Perhaps KTS had to back off its intended performance to meet FCC emission limits. Previously, several mainstream manufacturers complained to FCC that they could not meet the out-of-band emission requirements in this band with off-the-shelf equipment designs. However, MSS client Adaptrum demonstrated to FCC in a March 2011 filing that it could comply with the OOBE limits.

Congratulations to Spectrum Bridge and KTS on these first approvals. We hope there will be many more soon.

UPDATE

Andrew Mancone, Director of Sales and Marketing at KTS Wireless posted this clarification to Linkedin’s Spectrum Experts group:

Unfortunately, that paragraph in the December 22nd FCC notice caused a bit of confusion. The project in Wilmington has approval to move forward but our certification is finalized and valid starting January 26th, 2012.

Rumor has it that there are some wireless microphone channel optimization efforts underway and the administrative cleanup will take until the 26th of January. Therefore, the staggered start.

Fear not, certified devices are now here and implementation plans can move forward.


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