White Spaces Coalition:

{{Merge|White space (telecommunications)]] The White Spaces Coalition consists of eight large technology companies that plan to deliver high speed broadband internet access beginning in February 2009 to United States consumers via existing 'white space' in unused television frequencies between 54-698 MHz (TV Channels 2-51). The coalition expects speeds of 10 Mbyte/s and above, and 50 to 100 Mbyte/s for white space short-range networking.^[1] The group includes Microsoft, Google, Dell, HP, Intel, Philips, Earthlink, and Samsung Electro-Mechanics.

Senate Decision and 2008 Developments

Full power analog television broadcasts, which operate between the 54 MHz and 806 MHz television frequencies (Channels 2-69), are slated to cease operating in February 2009 per a United States digital switchover mandate. At that time, full power TV stations will be required to switch to digital transmission and operate only between 54-698 MHz. This is also the timetable that the white space coalition has set to begin offering wireless broadband services to consumers. The delay allows time for the United States Federal Communications Commission (FCC) to test the technology and make sure that it does not interfere with existing television broadcasts. Similar technologies could be used worldwide as much of the core technology is already in place.^[2]

The White Spaces Coalition formed in late 2006^{[citation needed]}, soon after the Senate set the date to cease analog broadcasts. It doesn't appear to have a website, but many of the companies involved in the White Spaces Coalition are also involved in the Wireless Innovation Alliance.

TV broadcasters and other incumbent users of this spectrum (including makers of wireless audio systems) fear that their systems will no longer function properly if unlicensed devices are to operate in the same spectrum. However, the Federal Communications Commission's Office of Engineering and Technology released a report dated October 15, 2008, which evaluated prototype TV-band white space devices. The report concluded that these devices had met the burden of "proof of concept."^[3] Nonetheless, the use of white space devices at 54-698 MHz must be approved by FCC Commissioners. Solutions at all major companies are currently pushing for deployment of their new products by Feb. 2009.

On November 4, 2008, the FCC voted 5-0 to approve the unlicensed use of white space.^[4]

Preliminary test

The Federal Communications Commission's Office of Engineering and Technology released a report dated July 31, 2007 with results from its investigation of two preliminary devices submitted. The report concluded that the devices did not reliably sense the presence of television transmissions or other incumbent users, hence are not acceptable for use in their current state and no further testing was deemed necessary.^[5]

However, on August 13, 2007 Microsoft filed a document with the FCC in which it described a meeting that its engineers had with FCC engineers from the Office of Engineering and Technology on August 9 and 10. At this meeting the Microsoft engineers showed results from their testing done with identical prototype devices and using identical testing methods that "detected DTV signals at a threshold of -114 dBm in laboratory bench testing with 100 percent accuracy, performing exactly as expected." In the presence of FCC engineers, the Microsoft engineers took apart the device that the FCC had tested to find the cause of the poor performance. They found that "the scanner in the device had been damaged and operated at a severely degraded level" which explained the FCC unit's inability to detect when channels were occupied. It was also pointed out that the FCC was in possession of an identical backup prototype that was in perfect operating condition that they had not tested.^[6]

White Spaces Coalition

Contents

Senate Decision and 2008 Developments

Preliminary test

See also

References

External links