In a family of IEEE 802 standards. 11 originally anticipated use one access point, but for modern challenges and this is not enough for many enterprises establish several points. In doing so, Wi-Fi terminals can be moved out of the actions of one access point to another, which requires about 100 ms for the installation of communication, a few more seconds spent on authentication protocol using 802. 1x. Of course, such a big delay in some situations, for example, when dealing with the help of VoIP, is unacceptable.
Given this lack of modern networks Wi-Fi, the organization has developed a new standard IEEE 802. 11r (r - roaming), also known as Fast Basic Service Set Transition, which allows devices with wireless adapters quickly register with the new network. IEEE 802 specification. 11r provides for a delay of less than 50 ms, which is enough comfort for continuous communication of VoIP-phone.
Interestingly, the IEEE has worked on a new standard for over four years and the first versions were developed as early as 2005 but the final official version presented just now. So far, manufacturers have been forced to reduce the level of security VoWi-Fi-telephony technology to introduce a similar scheme for action to Wi-Fi 802. 11r, to reduce delays to an acceptable level. Some developers, for example, Meru and Extricom, designed to address the problem of so-called bezroumingovye network, in which all access points have the same identifier BSSID, but such a solution in some situations creates new problems.
Industry observers believe that the adoption of the standard IEEE 802. 11r will promote greater development of networks VoWi-Fi.
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