[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/en\/wiki40\/ieee-802-11mc-wikipedia\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/en\/wiki40\/ieee-802-11mc-wikipedia\/","headline":"IEEE 802.11mc – Wikipedia","name":"IEEE 802.11mc – Wikipedia","description":"From Wikipedia, the free encyclopedia Task Group mc (TGmc) of the IEEE 802.11 Working Group, sometimes referred to as IEEE","datePublished":"2015-06-18","dateModified":"2015-06-18","author":{"@type":"Person","@id":"https:\/\/wiki.edu.vn\/en\/wiki40\/author\/lordneo\/#Person","name":"lordneo","url":"https:\/\/wiki.edu.vn\/en\/wiki40\/author\/lordneo\/","image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"Enzyklop\u00e4die","logo":{"@type":"ImageObject","@id":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","url":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/en.wikipedia.org\/wiki\/Special:CentralAutoLogin\/start?type=1x1","url":"https:\/\/en.wikipedia.org\/wiki\/Special:CentralAutoLogin\/start?type=1x1","height":"1","width":"1"},"url":"https:\/\/wiki.edu.vn\/en\/wiki40\/ieee-802-11mc-wikipedia\/","wordCount":1129,"articleBody":"From Wikipedia, the free encyclopediaTask Group mc (TGmc) of the IEEE 802.11 Working Group, sometimes referred to as IEEE 802.11mc, was the third maintenance\/revision group for the IEEE 802.11 WLAN standards.[1][2]  Purpose was to incorporate accumulated maintenance changes (editorial and technical corrections) into IEEE Std 802.11-2012, and roll up approved amendments into the standard.[3]The work by TGmc resulted in the publication of IEEE Std 802.11-2016 in 2016.[2]TGmc has ceased its operation. Maintenance\/revision for IEEE Std 802.11-2016 is being handled by TGmd.[2]Table of ContentsAmendments rolled-In[edit]Wi-Fi Round Trip Time[edit]Concept[edit]Application[edit]Android Pie[edit]References[edit]External links[edit]Amendments rolled-In[edit]Following amendments were incorporated by TGmc on top of IEEE Std 802.11-2012:Wi-Fi Round Trip Time[edit]While it is not the main purpose of the maintenance\/revision group, some features deemed not big enough to require a full Task Group within the IEEE 802.11 WG are sometimes added to the IEEE 802.11 standard via the maintenance\/revision group.The main feature added through TGmc is commonly known as Wi-Fi Round Trip Time (Wi-Fi RTT). It allows computing devices to measure the distance to nearby Wi-Fi access points (APs) and determine their indoor location with a precision of 1\u20132 metres using round-trip delay.[4]The accuracy is better than estimations with trilateration based on received signal strength indication (RSSI).Concept[edit]With a single Wi-Fi access point, only a distance measurement is available. With three or more nearby APs, an app can trilaterate a device’s location with an accuracy of one to two meters.The technology operation principle is based on time delay in signal reception and transmission – the time necessary for sending a signal and the time required for receiving its confirmation have to be taken into account. The system calculates this time span and then multiplies it by the speed of light.[4]Not all devices have the necessary hardware support yet for this feature. At present the list of the certified routers contains only the following models:[4]Google Wi-Fi.Compulab Wi-Fi Indoor Location Device.Google Nest Wi-Fi (Point or Router).Application[edit]With accurate indoor position awareness, apps can perform advanced automation based on where a device is in a building.For example, a smartphone user can have lights turn on when they enter a particular room by simply making voice commands since the device is location-aware (e.g. “turn on the lights in this room”).The technology makes it possible to create location-based applications and detailed services that let users orient easily inside buildings. In comparison with BLE, the function ensures higher accuracy in defining location and accelerates production processes.[5]Navigine tested the performance of the Wi-Fi RTT technology and made the conclusion that, subject to the specified requirements, the obtained result exceeds the declared values. Thus, within 95% of the time, the positioning accuracy in the check point is less than 1 m and within 50% of the time, the accuracy figures are kept within the limits of 30 cm. The delay in locating doesn\u2019t exceed 1 sec. Such time frames can be achieved by using the function of calculating pedestrian coordinates (PDR) within the particle filter.[5]Android Pie[edit]Wi-Fi Round-Trip-Time in Android Pie does not require that the phone connect to any Wi-Fi access points. Only the phone is used to determine distance, not the APs[citation needed]. This feature is also tied into the Android operating system’s existing location system to preserve the user’s privacy.Apps using round-trip delay time (RTT) need the location permission, and the device must have location-based services enabled at the system level.Many smartphone models with the Android 9 or later operating system can calculate the distance to access points. The following devices support Wi-Fi RTT technology: Xiaomi, LG Corporation, Samsung, Google Pixel, Poco X2, Sharp Aquos.[4]References[edit]External links[edit]"},{"@context":"http:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki40\/#breadcrumbitem","name":"Enzyklop\u00e4die"}},{"@type":"ListItem","position":2,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki40\/ieee-802-11mc-wikipedia\/#breadcrumbitem","name":"IEEE 802.11mc – Wikipedia"}}]}]