WiFi – TDLS(Main features)

Dr. Thierry Lestable

AP

TDLS: Channel Switching (single band case)

APTDLS

2,4GHz

2,4GHz

AP Traffic Offload & decrease congestion @2.4GHz

Base Channel

Off Channel

(STAs are registered ‘Sleeping’ towards AP

DL Traffic is being buffered during TDLS)

Base Channel

STAs periodically switch back to ‘Base Channel’:

- listen to AP beacon

- communicate with BSS

AP can advertise ‘TDLS Channel Switching Prohibited ‘

AP

TDLS: Channel Switching - Band Steering (multi-band case)

APTDLS

5GHz

2,4GHz

AP Traffic Offload & leave congested band @2.4GHz to 5GHz

Off Channel

Base Channel

(STAs are registered ‘Sleeping’ towards AP

DL Traffic is being buffered during TDLS)

Base Channel

STAs periodically switch back to ‘Base Channel’:

- listen to AP beacon

- communicate with BSS

AP can advertise ‘TDLS Channel Switching Prohibited ‘

AP APTDLS

11g

11n

AP Traffic Offload & increased DIRECT Transmission capability

TDLS: 11g / 11n

TDLS: Implicit Concurrent Access between AP and Direct Link

No requirement for AP to be TDLS aware

TDLS Frames encapsulated in IP Packets

Transparent transmission via AP

AP is ‘Blind’ w.r.t TDLS on-going

TDLS initiator & responder are thus still fully

connected to AP

NO NEED FOR SPECIAL FUNCTIONALITY IN THE AP.

WORKS WITH ALL EXISTING APs

AP

TDLS

AP can set ‘TDLS Prohibited’ in his BEACON

Web

RGW

APAP

AP

Tunneled Direct Link Set-up (TDLS)

TDLS

Dr.Thierry Lestable - 2013