802.11r - Basics
What is IEEE 802.11r?
IEEE 802.11r is an amendment to the 802.11 standard that enables fast Basic Service Set (BSS) transitions, allowing quicker and seamless handoffs between access points.
Why is 802.11r important?
It reduces roaming latency, improving user experience for applications requiring real-time communication like VoIP and video streaming.
What problem does 802.11r solve?
It solves the slow handoff process in Wi-Fi networks that causes delays and packet loss during client roaming between access points.
How does 802.11r improve roaming?
By enabling fast BSS transitions using key caching and pre-authentication with the target access point before roaming occurs.
What is Fast Basic Service Set Transition (FT)?
FT is the core mechanism in 802.11r that enables clients to securely roam quickly between APs without full reauthentication.
Does 802.11r require hardware support?
Yes, both client devices and access points must support 802.11r for fast roaming to function properly.
Is 802.11r compatible with legacy devices?
Legacy devices not supporting 802.11r can still connect but will experience normal roaming latency without the benefits of fast transitions.
How does 802.11r affect security?
It securely handles fast reauthentication using the same credentials and encryption keys, reducing authentication overhead.
What is key caching in 802.11r?
Key caching allows the client to reuse encryption keys with a new AP during roaming, avoiding a full handshake.
Does 802.11r require special network configuration?
Yes, the wireless infrastructure must be configured to enable FT and support mobility domain definitions.
What is a Mobility Domain in 802.11r?
A mobility domain is a group of APs sharing the same security and FT parameters, allowing clients to roam seamlessly within it.
Can 802.11r be used with WPA2-Enterprise?
Yes, 802.11r is designed to work with WPA2-Enterprise security for secure fast roaming.
How much latency reduction does 802.11r provide?
It can reduce handoff delays from hundreds of milliseconds to under 50 milliseconds in optimal conditions.
Does 802.11r impact battery life on clients?
There is minimal impact, and fast roaming can actually reduce power consumption by shortening the handoff process.
Is 802.11r mandatory for all Wi-Fi networks?
No, it is optional and primarily beneficial for networks with high mobility or real-time communication needs.
What standards does 802.11r complement?
It complements 802.11i for security and 802.11k/v for radio resource management and roaming assistance.
Can 802.11r be combined with 802.11ac or 802.11ax?
Yes, 802.11r is a mobility enhancement and can be implemented alongside newer Wi-Fi standards.
What devices support 802.11r?
Many modern enterprise APs and client devices (smartphones, laptops) support 802.11r, but it varies by manufacturer.
How do I verify if 802.11r is enabled on my network?
Check your access point settings or client device Wi-Fi properties for FT (Fast Transition) or 802.11r options.
In this section, you are going to learn
Terminology
Version Info
rfc details
setup
setup
Reference links