WiFi Alliance, Tunneled Direct Link Set-up (TDLS) key features in 1 slide...

1. WiFi – TDLS
(Main features)
Dr. Thierry Lestable

2. TDLS: Implicit Concurrent Access between AP and Direct Link
Tunneled Direct Link Set-up (TDLS)
No requirement for AP to be TDLS aware
TDLS Frames encapsulated in IP Packets
AP
AP
Web
AP is ‘Blind’ w.r.t TDLS on-going
RGW
TDLS
AP
TDLS: 11g / 11n
TDLS: Channel Switching (single band case)
Base Channel
11g
AP
2,4GHz
11n
AP Traffic Offload & increased DIRECT Transmission capability
TDLS: Channel Switching - Band Steering (multi-band case)
Base Channel
Base Channel
AP
AP
TDLS
TDLS initiator & responder are thus still fully
connected to AP
AP can set ‘TDLS Prohibited’ in his BEACON
NO NEED FOR SPECIAL FUNCTIONALITY IN THE AP.
WORKS WITH ALL EXISTING APs
TDLS
AP
Transparent transmission via AP
AP
AP
AP
TDLS
2,4GHz
Off Channel
AP Traffic Offload & decrease congestion @2.4GHz
(STAs are registered ‘Sleeping’ towards AP
DL Traffic is being buffered during TDLS)
STAs periodically switch back to ‘Base Channel’:
- listen to AP beacon
- communicate with BSS
AP can advertise ‘TDLS Channel Switching Prohibited ‘
Dr.Thierry Lestable - 2013
Base Channel
2,4GHz
TDLS
5GHz
Off Channel
AP Traffic Offload & leave congested band @2.4GHz to 5GHz
(STAs are registered ‘Sleeping’ towards AP
DL Traffic is being buffered during TDLS)
STAs periodically switch back to ‘Base Channel’:
- listen to AP beacon
- communicate with BSS
AP can advertise ‘TDLS Channel Switching Prohibited ‘