Steven J. Crowley, P.E.
LightSquared has asked the FCC for special temporary authority to conduct four months of tests in support of a potential frequency move. The application, and accompanying exhibit, were received by the FCC on March 5.
As background, to help resolve GPS interference concerns, LightSquared has proposed to conduct a portion of its terrestrial operations in 1670-1680 MHz instead of 1545-1555 MHz. It currently has authority to use half that, 1670-1675 MHz. The 1675-1680 MHz portion, however, is currently allocated for use by meteorological aids such as radiosondes and satellites. The company wants to conduct tests to see if its base stations would be compatible with other services in the 1675-1680 MHz band. A big concern is the radiosondes. Another part of the testing is determining if the radiosondes would be compatible with other services in the 400.15-406 MHz band, if they need to move there to accommodate LightSquared’s needs in 1675-1680 MHz. If a move is needed, the tests would help determine the costs of such a move, and “inform an eventual determination of an appropriate vehicle for meeting these costs” (i.e., who pays).
LightSquared asks to conduct tests across the continental United States. All transmitters would be coordinated with the FCC and NTIA, as needed.
A group launching a search for extraterrestrial intelligence awaits approval of an application it’s filed at the FCC for an experimental radio license. Such searches generally focus on seeking evidence of other life based on what’s received. This one is sending messages. More specifically, “project objectives include the establishment of a communications link capable of being received” at planet outside the solar system.
At its February 20 meeting, the FCC will likely adopt a Notice of Proposed Rulemaking as a first step toward increasing the amount of spectrum available in the 5 GHz band for unlicensed devices. Up to 195 MHz might be made available, which is a 35% increase over the present 555 MHz. Chairman Genachowski announced this initiative at CES in January. A leading application for new spectrum would be IEEE 802.11ac, which could have four instead of the current two 160 MHz-wide channels.
Wireless investment fund seeks FCC authority to test Globalstar’s proposed terrestrial low-power service
Yesterday the FCC received an application for experimental radio license from the Jarvinian Wireless Innovation Fund. Among other activities, the fund is working with Globalstar in its effort to establish a so-called terrestrial low-power service (TLPS). Globalstar petitioned the FCC to create such a service last November. The idea is to take the upper 2.4 GHz unlicensed band that isn’t now available for Wi-Fi, combine it Globalstar’s terrestrial-use spectrum, and create a new service operating on 2473-2495 MHz. This corresponds to IEEE 802.11 (Wi-Fi) channel 14, which can’t be used in the U.S. as it overlaps with Globalstar’s spectrum. Unlike Wi-Fi, TLPS would be managed to control interference.
Here it is: At 600 MHz, interference travels farther than it does at higher frequencies, all else equal.
During the inauguration there were press reports of Jumbotron problems — pixelated video and distorted audio — at the Washington Monument.
Yesterday the Washington Post reported that the problems could have been due to “interference with a microwave signal” that brings video and audio to the Jumbotrons.
Google filed an application at the FCC last week seeking permission to conduct testing of an experimental radio system. Portions of the application and accompanying exhibits have been designated confidential and are thus not available to the public. Even the request for confidential treatment has been redacted. Let’s try to infer what’s happening from the information available.
FCC Chairman Julius Genachowski yesterday announced an initiative to make 195 MHz of more spectrum available for Wi-Fi in the 5 GHz band.
The last time more spectrum for Wi-Fi was made available in this range was in 2003, when an FCC increased the then 300 MHz bandwidth to 555 MHz. As the document in that last link shows, the 5 GHz band is not as neat as the 2.4 GHz band, with other services, such as radar, requiring protection. These coexistence issues will have to be looked at again.
Deloitte recently issued a new report on mobile broadband. It positions the U.S. as number-one and offers tips to keep it there, some more useful than others. There’s not much new for the mobile broadband expert. The collection of various mobile-spectrum policy issues into one document, however, could be useful to some, especially to those new to the field. Early on, Deloitte promises suggestions for improving U.S. spectrum policy; the suggestions, however, turn out to be mostly things we’ve heard before. There are a few problems with the report, discussed below, that readers should keep in mind.
This summarizes a selection of applications for the Experimental Radio Service received by the FCC during July and August, 2012. These are related to medium-frequency communications, meteor radar, space-to-space communications, UAV communications, synthetic aperture radar, TV white space, 600 MHz LTE, disaster communications, cellular content caching, GSM, passive intermodulation distortion, ultra-wideband, TDD, ground-mapping radar, Doppler radar, and ground surveillance radar. The descriptions are sorted by the lowest frequency in the application.
In the first of a series of webinars, Qualcomm today began reporting on the results of its “1000x Data Challenge,” an initiative to meet what it sees as the need, someday, to increase mobile capacity 1000-times. The webinar, conducted by Rasmus Hellberg, Qualcomm’s Senior Director of Technical Marketing, was an overview. He discussed spectrum, small cells, and other techniques to increase capacity. More-detailed webinars on each of these are forthcoming: spectrum initiatives on September 18, small cells and heterogeneous networks on October 18, and more efficient networks, applications, and devices on November 14. Today’s webinar should be posted tomorrow, and a white paper should appear in about a week.
Ericsson discusses the recent meeting of the Moving Picture Experts Group (MPEG), which issued a draft international standard of the new High Efficiency Video Coding (HEVC) video-compression format. It’s twice as efficient as current standards. Twice as efficient means half the bits, which means half the spectrum capacity is required for the same video quality.