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'''802.11j-2004''' or '''802.11j''' is an amendment to the [[IEEE 802.11]] standard designed specially for [[Japan]]ese market. It allows [[Wireless LAN]] operation in the 4.9 to 5 [[Gigahertz|GHz]] band to conform to the Japanese rules for radio operation for indoor, outdoor and mobile applications. The amendment has been incorporated into the published [[IEEE 802.11-2007#802.11-2007|IEEE 802.11-2007]] standard.
{{short description|IEEE 802.11 variation designed specially for Japanese market}}
'''802.11j-2004''' or '''802.11j''' is an amendment to the [[IEEE 802.11]] standard designed specially for Japanese market. It allows [[wireless LAN]] operation in the 4.9–5.0 [[Gigahertz|GHz]] band to conform to the Japanese rules for radio operation for indoor, outdoor and mobile applications. The amendment has been incorporated into the published [[IEEE 802.11-2007#802.11-2007|IEEE 802.11-2007]] standard.


[[802.11]] is a set of [[IEEE]] standards that govern [[wireless networking]] transmission methods. They are commonly used today in their [[802.11a]], [[802.11b]], and [[802.11g]] versions to provide wireless connectivity in the home, office and some commercial establishments.
[[802.11]] is a set of [[IEEE]] standards that govern [[wireless networking]] transmission methods. They are commonly used today in their [[802.11a]], [[802.11b]], [[802.11g]] and [[802.11n]] versions to provide wireless connectivity in the home, office and some commercial establishments.


⚫
==4.9–5.0 GHz operation in Japan==
⚫
The 802.11j standard "Wireless LAN Medium Access Control ([[Medium access control|MAC]]) and Physical Layer ([[PHY]]) Specifications: [4.9–5.0 GHz] Operation in Japan" is designed specially for the Japanese market. Finalized in 2004, the standard works in the 4.9–5.0 GHz band to conform to the Japanese rules for radio operation for indoor, outdoor and mobile applications.


⚫
802.11j defines uniform methods that let APs move to new frequencies or change channel width for better performance or capacity—for example, to avoid interference with other wireless applications.
⚫
==4.9 - 5 GHz Operation in Japan==
⚫
The 802.11j standard "Wireless LAN Medium Access Control ([[MAC]]) and Physical Layer ([[PHY]]) Specifications: 4.9 to 5 GHz Operation in [[Japan]]" is designed specially for [[Japan]]ese market. Finalized in 2004, the standard works in the 4.9 GHz to 5 GHz band to conform to the Japanese rules for radio operation for indoor, outdoor and mobile applications.


Registration is necessary to use this frequency band. Currently the 4900–5000&nbsp;MHz spectrum is available for use while 5030–5091&nbsp;MHz spectrum have been revoked.<ref>[https://sgforum.impress.co.jp/article/874 活発化する電波／周波数の割り当て（5）：無線LANの最新動向]</ref><ref>[http://www.tele.soumu.go.jp/j/adm/system/trunk/wimax/5ghz/ 5GHz帯無線アクセスシステム]</ref>
⚫
802.11j defines uniform methods that let APs move to new frequencies or change channel width for better performance or capacity -- for example, to avoid interference with other wireless applications.


==In the United States==
===Public Safety===
{{Update section|date=January 2021}}
In the [[USA]], the 4.9 GHz band is reserved for use by public safety wireless applications. The transmission mask is narrower for the public safety band than for consumer part 15 applications. Thus one cannot simply operate 802.11j equipment in the public safety band and be FCC compliant. Public safety agencies are working with manufacturers and the FCC in order to leverage Commercial Off The Shelf (COTS) equipment. There are public safety groups working closely with the manufacturing community, federal interests, and standards bodies to create an 802.11 series standard for public safety.[http://www.apco911.org/frequency/4-9GHz/4-9GHz.htm]
In the United States, the 4.9&nbsp;GHz band is reserved for use by public safety wireless applications. The transmission mask is narrower for the public safety band than for consumer part 15 applications. Thus one cannot simply operate 802.11j equipment in the public safety band and be FCC compliant. Public safety agencies are working with{{how|date=December 2019}} manufacturers and the FCC in order to leverage commercial off-the-shelf (COTS) equipment. {{As of|2005}} there were public safety groups{{which|date=April 2019}} working closely with the manufacturing community, federal interests, and standards bodies to create an 802.11 series standard for public safety.<ref>{{cite web|url=http://www.apco911.org/frequency/4-9GHz/4-9GHz.htm|title=Broadband Technology for Public Safety|archive-url=https://web.archive.org/web/20050728162631/http://www.apco911.org/frequency/4-9GHz/4-9GHz.htm|archive-date=2005-07-28}}</ref>


===See also===
==See also==
*[[IEEE 802.11a]]
* [[IEEE 802.11a]]
*[[IEEE 802.11h]]
* [[IEEE 802.11h]]
*[[IEEE 802.11p]]
* [[IEEE 802.11p]]

==References==
{{Reflist}}


==External links==
==External links==
*[http://standards.ieee.org/getieee802/download/802.11j-2004.pdf The 802.11j-2004 standard]
* {{cite web |url=https://standards.ieee.org/getieee802/download/802.11j-2004.pdf |archive-url=https://web.archive.org/web/20051029034846/http://standards.ieee.org/getieee802/download/802.11j-2004.pdf |url-status=dead |archive-date=October 29, 2005 |title=The 802.11j-2004 standard |work=Get IEEE 802: local and metropolitan area networks standards}}
*[http://grouper.ieee.org/groups/802/11/Reports/tgj_update.htm Status of Project IEEE 802.11j] IEEE Task Group TGj
* {{cite web |url=https://grouper.ieee.org/groups/802/11/Reports/tgj_update.htm |title=IEEE P802.11 - task group J - meeting update: Status of project IEEE 802.11j |url-status=dead |archive-url=https://web.archive.org/web/20160303231810/http://grouper.ieee.org/groups/802/11/Reports/tgj_update.htm |archive-date=2016-03-03 }}
*[http://informationweek.mobilepipeline.com/news/54200930 802.11 Standard Modified For Japan] ''Information Week'' November 29, 2004
* {{cite web |url=http://informationweek.mobilepipeline.com/news/54200930 |title=802.11 Standard Modified For Japan |work=Information Week |date=November 29, 2004}}{{dead link |date=October 2016}}
*[http://www.theregister.co.uk/2004/12/13/wi-fi_extensions/ Wi-Fi extensions should breathe new life into 802.11a] Wireless Watch ''The Guardian'' December 13, 2004
* {{cite news |url=https://www.theregister.co.uk/2004/12/13/wi-fi_extensions/ |title=Wi-Fi extensions should breathe new life into 802.11a |work= Wireless Watch – The Guardian |date=December 13, 2004}}
*[http://www.wi-fiplanet.com/news/article.php/3444141 Wi-Fi Goes International] Ed Sutherland ''Wi-Fi Planet'' December 6, 2004
* {{cite web |url=http://www.wi-fiplanet.com/news/article.php/3444141 |title=Wi-Fi goes international |author=Ed Sutherland |work=Wi-Fi Planet |date=December 6, 2004 |access-date=October 1, 2005 |archive-url=https://web.archive.org/web/20051119100320/http://www.wi-fiplanet.com/news/article.php/3444141 |archive-date=November 19, 2005 |url-status=dead }}
*[http://www.enterprisenetworksandservers.com/monthly/art.php/1632 4.9GHz Cisco wireless aids police] ''Enterprise Networks and Servers'' August 2005
* {{cite web |url=http://www.enterprisenetworksandservers.com/monthly/art.php/1632 |title=4.9GHz Cisco wireless aids police |work=Enterprise Networks and Servers |date=August 2005}}{{dead link |date=October 2016}}

{{IEEE standards}}


[[Category:IEEE 802.11|J]]
[[Category:IEEE 802.11|J]]

Latest revision as of 03:52, 31 July 2024

802.11j-2004 or 802.11j is an amendment to the IEEE 802.11 standard designed specially for Japanese market. It allows wireless LAN operation in the 4.9–5.0 GHz band to conform to the Japanese rules for radio operation for indoor, outdoor and mobile applications. The amendment has been incorporated into the published IEEE 802.11-2007 standard.

802.11 is a set of IEEE standards that govern wireless networking transmission methods. They are commonly used today in their 802.11a, 802.11b, 802.11g and 802.11n versions to provide wireless connectivity in the home, office and some commercial establishments.

4.9–5.0 GHz operation in Japan

[edit]

The 802.11j standard "Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications: [4.9–5.0 GHz] Operation in Japan" is designed specially for the Japanese market. Finalized in 2004, the standard works in the 4.9–5.0 GHz band to conform to the Japanese rules for radio operation for indoor, outdoor and mobile applications.

802.11j defines uniform methods that let APs move to new frequencies or change channel width for better performance or capacity—for example, to avoid interference with other wireless applications.

Registration is necessary to use this frequency band. Currently the 4900–5000 MHz spectrum is available for use while 5030–5091 MHz spectrum have been revoked.[1][2]

In the United States

[edit]

In the United States, the 4.9 GHz band is reserved for use by public safety wireless applications. The transmission mask is narrower for the public safety band than for consumer part 15 applications. Thus one cannot simply operate 802.11j equipment in the public safety band and be FCC compliant. Public safety agencies are working with[how?] manufacturers and the FCC in order to leverage commercial off-the-shelf (COTS) equipment. As of 2005 there were public safety groups[which?] working closely with the manufacturing community, federal interests, and standards bodies to create an 802.11 series standard for public safety.[3]

See also

[edit]

References

[edit]
  1. ^ 活発化する電波／周波数の割り当て（5）：無線LANの最新動向
  2. ^ 5GHz帯無線アクセスシステム
  3. ^ "Broadband Technology for Public Safety". Archived from the original on 2005-07-28.
[edit]
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