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TDLS Setup

TDLS Setup. Date: 2008-03-12. Authors:. TDLS Setup goes through 3-way handshakes: TDLS Setup Request (STA1 STA2 ) TDLS Setup Response (STA2 STA1 ) TDLS Setup Reply (STA1 STA2 )

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TDLS Setup

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  1. TDLS Setup Date: 2008-03-12 Authors: L.Chu Etc.

  2. TDLS Setup goes through 3-way handshakes: TDLS Setup Request (STA1STA2) TDLS Setup Response (STA2STA1) TDLS Setup Reply (STA1STA2) If security is required between STAs using direct path, SMK handshake messages 1, 2, 3 shall be included in TDLS Setup messages. TDLS Setup in [1] AP AP Path 2a 1a 1a 2a 1b 1b Direct Link STA2 STA1 L.Chu Etc.

  3. The draft does not define the behavior of STAa and STAb try to setup TDLS direct link path at almost the same time. If the draft allows the continuation of each setup procedure, Both of the STAs are initiator stations. If security is required in the DLS path, there are two set of INonce, PNonce etc. which is difficult to get master key. Who will start 4-way handshake to get the temporary session key. The procedure to fix this problem should be provided. Problem 1 with TDLS Setup AP STAb initiated setup procedure. AP Path 2a 1a STAa initiated setup procedure. 1a 2a 1b 1b Direct Link STAb STAa L.Chu Etc.

  4. Solution 1 If STAa and STAb try to setup TDLS direct link path at almost the same time, one TDLS Setup Request can be ignored, for example: the request from the STA with larger MAC address (or larger AID) is ignored. The STA with lower MAC address (or lower AID) may send a TDLS Setup Response with status code “collided TDLS Setup”. Solution 2 If STAa and STAb try to setup TDLS direct link path at almost the same time, both TDLS Setup Request can be ignored. Two STAs can go through a backoff procedure before trying another TDLS Setup procedure with the peer STA. It seems that solution 1 is a good method. Solution to TDLS Setup Problem 1 L.Chu Etc.

  5. In MLME section (section 11), if security is required between STAs using direct path, SMK handshake messages 1, 2, 3 shall be included in TDLS Setup messages. In security section (section 8), each time a STA receive a SMK handshake message, it will verify the Peer MAC address against existing direct link. If no direct link exists, it silently discards the message. Apparently, these two places give contradictory descriptions. Problem 2 with TDLS Setup L.Chu Etc.

  6. On receipt of Message 1, the peer STA performs following actions: a) Verify the initiator MAC address against existing direct link or Message 1 being part of TDLS Setup Request. If no direct link exists or Message 1 is not part of TDLS Setup Request, it silently discards the message. On receipt of Message 2, the initiator STA performs following actions: a) Verify the peer MAC address against existing direct link or Message 2 being part of TDLS Setup Response. If no direct link exists or Message 2 is not part of TDLS Setup Response, it silently discards the message. On receipt of Message 3, the peer STA performs following actions: a) Verify the initiator MAC address against existing direct link or Message 3 being part of TDLS Setup Confirm. If no direct link exists or Message 3 is not part of TDLS Setup Confirm, it silently discards the message. Solution to TDLS Setup Problem 2 L.Chu Etc.

  7. Reference [1] IEEE P802.11zTM/D0.2 Draft STANDARD for Information Technology – Telecommunications and information exchange between systems – Local and metropolitan area networks – Part 11 Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications Amendment 7: Direct Link Setup L.Chu Etc.

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