Three 45 Mbit/s wireless dishes on top of 307 W. 7th Street Fort Worth TX

Wireless Broadband is a fairly new technology that provides high-speed wireless internet and data network access over a wide area.

[edit] The term broadband

According to the 802.16-2004 standard, broadband means 'having instantaneous bandwidth greater than around 1 MHz and supporting data rates greater than about 1.5 Mbit/s. This means that Wireless Broadband features speeds roughly equivalent to wired broadband access, such as that of ADSL or a cable modem.

[edit] Abbreviation

The acronym "WiBB" is entering the vernacular as a contraction of "Wireless Broadband", in much the same way as "WiFi" refers to 802.11 or similar wireless networks.

[edit] Technology and speeds

A typical WISP Customer Premises Equipment (CPE) installed on a residence.

Few Wireless Internet Service Providers (WISPs) provide download speeds of over 100 Mbit/s; most broadband wireless access services are estimated to have a range of 50 km (30 miles) from a tower.^[1] Technologies used include LMDS and MMDS, as well as heavy use of the ISM bands and one particular access technology is being standardized by IEEE 802.16, also known as WiMAX. WiMAX is highly popular in Europe but has not met full acceptance in the United States because cost of deployment does not meet return on investment figures. In 2005 the Federal Communications Commission adopted a Report and Order that revised the FCC’s rules to open the 3650 MHz band for terrestrial wireless broadband operations.^[2] On November 14, 2007 the Commission released Public Notice DA 07-4605 in which the Wireless Telecommunications Bureau announced the start date for licensing and registration process for the 3650-3700 MHz band.^[3]

Initially, WISPs were only found in rural areas not covered by cable or DSL.^[4] These early WISPs would employ a high-capacity T-carrier, such as a T1 or DS3 connection, and then broadcast the signal from a high elevation, such as at the top of a water tower. To receive this type of Internet connection, consumers mount a small dish to the roof of their home or office and point it to the transmitter. Line of sight is usually necessary for WISPs operating in the 2.4 and 5 GHz bands with 900 MHz offering better NLOS (non-line-of-sight) performance.

[edit] Mobile wireless broadband

Also called Mobile Broadband, wireless broadband technologies include new services from companies such as Verizon, Sprint, and AT&T Mobility, which allow a more mobile version of this broadband access. Consumers can purchase a PC card, laptop card, or USB equipment to connect their PC or laptop to the Internet via cell phone towers. This type of connection would be stable in almost any area that could also receive a strong cell phone connection. These connections can cost more for portable convenience as well as having speed limitations in all but urban environments.

[edit] Licensing

A wireless connection can be either licensed or unlicensed. In the US, licensed connections use a private spectrum the user has secured rights to from the FCC. In other countries, spectrum is licensed from the country's national radio communications authority (such as the ACMA in Australia or NCC in Nigeria). Licensing is usually expensive and often reserved for large companies who wish to guarantee private access to spectrum for use in point to point communication. Because of this, most wireless ISP's use unlicensed spectrum which is publicly shared.

[edit] Demand for spectrum in U.S.

In the United States, more of the broadcast spectrum was needed for wireless broadband Internet access, and in March 2009, Massachusetts Senator John Kerry introduced a bill requiring a study of efficient use of the spectrum.

Later in the year, the CTIA said 800 MHz needed to be added. David Donovan of The Association for Maximum Service Television said the 2 GHz band, allocated for mobile satellite service, was not even being used after ten years, and switching to this band would be better than asking broadcasters to give up even more. Because of the digital transition, television had lost 100 of its 400 MHz.^[5] The National Association of Broadcasters and the AMST commented to the FCC that the government should make maximum use of this newly available spectrum and other spectrum already allocated for wireless before asking for more, while companies that would benefit asked the government to look everywhere possible. A Consumer Electronics Association (CEA) study claimed that $62 billion worth of spectrum could become $1 trillion for wireless, and one proposal would require all TV stations, including LPTV, to give up all spectrum, with subsdized multichannel services replacing over-the-air TV, even after viewers spent a great deal of money on the DTV transition.^[6][7] Broadcasters responded, "In the broadcasting context, the 'total value' is not a strict financial measure, but rather is one that encompasses the broader public policy objectives such as universal service, local journalism and public safety."^[6] Broadcasters pointed out that the government, viewers and the related industries spent $1.5 billion making sure that a minority of the audience would be ready for the DTV transition. Any change could mean the loss of free TV to people in rural areas, broadcasters said, particularly "local journalism, universal service, availability of educational programming, and timely and reliable provision of emergency information."^[6]

Meredith Attwell Baker, the newest Republican FCC commissioner, agreed that properly using the existing spectrum was important, and part of doing this was using the latest technology. The wireless industry needed more spectrum, both licensed and unlicensed.^[8]

FCC broadband advisor Blair Levin wanted a plan by February 2010. Among the possibilities were restricting over-the-air stations to a single standard definition channel, and requiring each network affiliate to be one of a group of subchannels of a single channel, with HDTV only available from a MVPD. Although other spectrum was being considered, Levin said of the broadcast spectrum, "It's very attractive for wireless." As for the CEA "total recall" proposal, Levin said, "The discussions to date between the broadcasters and the commission would free up spectrum but allow all channels to broadcast over the air."^[7]

Bob Powers, vice president of government relations for the National Religious Broadcasters, pointed out that the Levin proposal did not provide for religious broadcasters.^[9]

Regarding the CEA study's findings, Donovan said to Broadcasting & Cable magazine:

Wireless companies are asking the government to participate in the biggest consumer bait-and-switch in American history. For the last few years, the government told consumers that digital television would bring them free over-the-air HDTV and more channels. Now, after purchasing billions of dollars in new digital equipment and antennas, wireless advocates are asking the government to renege on its promise. High-definition programming and more digital channels would become the sole and exclusive province of pay services. The American public simply will not stand for this.^[7]

PBS and its stations also opposed the plan, saying they had spent a lot of money on the digital upgrade which they need to earn back, and viewers had contributed expecting the digital broadcasting to continue. They claimed PBS was "efficient and productive, and abundantly serves the public interest."^[10] The National Association of Broadcasters (NAB) also opposed the idea because the industry spent $15 billion, in addition to giving up spectrum already.^[11]

Another proposal was "geo-filtered WiMAX", which would allow HDTV but only in a particular market, with the remainder of the spectrum sold for $60 billion. WiMax would replace the existing services but would make MVPD services cheaper, while still allowing broadcasters to make more money. The additional spectrum made available could then be sold to pay the industry's debt.^[7]

An FCC workshop on November 23 produced several ideas. Virginia Tech professor Charles Bostian said sharing should be done, but not in the white spaces; WiFi spectrum should be used instead. Vint Cerf of Google said cable companies could share some spectrum, which the companies would like to do except they have "must-carry" rules that will not allow this. BBN Technologies chief engineer Chip Elliott called for government-funded broadband to be shared by researchers. Collaboration was the key to advancing the technology, and the word "collaboratories" referred to broadband as "not only the goal of the research, but the vehicle as well."^[12]

On December 14 at a hearing before the Communications Subcommittee of the House Energy & Commerce Committee, NAB president Gordon H. Smith said the government and individuals had spent too much money on the DTV transition and for HDTV for further changes to make their efforts worthless, and that broadband and broadcasting could co-exist. He pointed out that in the 1970s, broadcasting used 60 percent of the spectrum that it does now to deliver a much higher quality product, and that existing regulations required more efficient use of the spectrum than would be the case for new devices. On the subject of what could be done instead, Smith recommended using white space in rural areas with fixed devices rather than mobile devices, and new types of broadband service such as those developed by Sezmi. CTIA president Steve Largent said that the industry needed spectrum, "wherever it comes from." He said government spectrum probably was not efficiently used and would "likely" be "repurposed", while other broadcast and satellite spectrum "may" be used better for wireless. Largent also said without more spectrum, companies might merge to better use what they had. Consultant Dave Hatfield, former FCC engineering and technology chief, said making maximum use of existing spectrum through compression and modulation would help, but it would not be enough. Oregon Republican House member Greg Walden criticized the FCC for hiring Distinguished Scholar in Residence Stuart Benjamin, whose essay recommending replacing broadcast spectrum entirely Walden called an "abomination".^[13][14]

[edit] See also

• Broadband Internet access
• Clearwire
• CorDECT
• HIPERMAN
• IEEE 802.16
• Skyriver
• WiMAX
• Wireless Broadband Alliance
• iBurst
• 802.20

[edit] References

[edit] External links

• Wireless Internet Service Provider Association