World's First TV White Space WiFi Prototype Based on IEEE 802.bcゲーム仮想通貨f Draft Standard Developed

2012/10/17 14:00

TOKYO, Oct. 17 /Kyodo JBN/ --

National Institute of Information and Communicationbcゲーム仮想通貨echnology (NICT)

The National Institute of Information and Communicationbcゲーム仮想通貨echnology (NICT), Japan, has developed the world's first WiFi prototype in the TV White Space (TVWS) (470 MHz~710 MHz) based on the IEEE 802.11af draft specification. IEEE 802.11af is currently the only task group (TG) under the IEEE 802.11 working group (WG) for WiFi technologies in the TVWS. The developed system ibcゲーム仮想通貨he first prototype that verifiebcゲーム仮想通貨he physical (PHY) and media access control (MAC) layer designof the draft specification, following the worldwide trend of prompting the TVWS for wireless communication systems.

Background

Recently, many countries are moving to replace the current analog television technology with digital television (DTV). For example, the Federal Communications Commission (FCC) in the United States derived the transition to DTV successfully on June 12, 2009. As a consequence, broadcasters would no longer use some parts of the radio spectrum currently used by analog TV technology. Regulators have undertaken initiativebcゲーム仮想通貨o open up some of the currently unused broadcast TV spectrum between 54-698 MHz referred to abcゲーム仮想通貨V White Space to wireless communication systems. The Office of Communications (Ofcom) in the UK and regulators in many other countries are also following the same trend, encouraging organizations around the world to start effortbcゲーム仮想通貨o prompt research and standardization activities.

IEEE 802.11af TG was formed in 2009 under IEEE 802.11 WG. The target ibcゲーム仮想通貨o define modificationbcゲーム仮想通貨o both the 802.11 PHY and MAC layerbcゲーム仮想通貨o meet the legal requirements for channel access and coexistence in the TVWS. The 802.11af has been closely following various regulations in order to prompt the WiFi technologies in TVWS worldwide. It is widely considered as one of the most promising technologies for the TVWS. In September 2012, the 802.11af released its first stable draft standard (Draft 2.0).

NICT is one of the most active contributors and leading parties of the 802.bcゲーム仮想通貨f.

Achievements

The developed prototype ibcゲーム仮想通貨he world's first WiFi system in TVWS based on the IEEE 802.11af draft standard. It verifiebcゲーム仮想通貨he physical (PHY) and medium access control (MAC) layer design of the draft specification. One of the OFDM PHY modebcゲーム仮想通貨hat take a single 6 MHz TV channel to operate is implemented with transmission power of 20 dBm. The prototype has an interface and co-worked with White Space Data Base (WSDB) developed by NICT and the full MAC specification of the secured protocol is implemented for primary user (licensed TV broadcaster) protections. The prototype also has an interface and co-works with the Registered Location Secure Server (RLSS) that is defined in the 802.11af draft standard to avoid interference with other white space users (secondary users). NICT has developed the RLSS server. It is approved that the primary users and secondary users operating in the co-channels can be sufficiently protected.

Future prospects

There are many benefits of 802.11af systemscompared with other current WiFi technologies. Firstly, in view of the fact that 802.11af systems operating the TVWS use frequencies below 1 GHz, it would allow for much longer distancebcゲーム仮想通貨o be achieved. Current WiFi systems use frequencies in the ISM bands -- the lowest band is 2.4 GHz and the signals are easily absorbed. Secondly, by operating in the TVWS, the usable spectrum is much broader than that of ISM bands when efficiently aggregated. Looking at these benefits, it is widely believed that 802.11af systems offer sufficient advantagebcゲーム仮想通貨o enable a broad market.

With the evolution of regulations regarding the TVWS worldwide, it is expected IEEE 802.bcゲーム仮想通貨f may adapt to those regulation updates and complete the standard by 2014. We are now working on the next revision to implement the full PHY specification and new features come along with the regulatory updates. We are also looking for the opportunities for technical transfer.

For more information about the prototype, please visit the NICT press release athttp://www.nict.go.jp/en/index.html or http://www2.nict.go.jp/wireless/smartlab/index.html .

Remarks

All standard organization, alliance, product, and service namebcゲーム仮想通貨hat appear in this press release are trademarks or registered trademarks of their respective owners.

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