Question: In LWA (LTE-WLAN Aggregation) setup between a UE and a WT (WLAN Termination), how is the security key (S-KWT) utilized for protecting the WLAN link, in relation to IEEE 802.11 security mechanisms?
Option 1: The S-KWT is used directly as an EAP (Extensible Authentication Protocol) password for authentication with the WLAN AP.
Option 2: The UE and WT use the S-KWT equivalently to either the PMK (Pairwise Master Key) or PSK (Pre-Shared Key) defined in IEEE 802.11 specification, for initializing security handshakes.
Option 3: The S-KWT is sent to the WLAN AP, which then generates a unique PMK/PSK for each connected UE based on the received S-KWT and UE's MAC address.
Option 4: The security key (S-KWT) is not directly used in IEEE 802.11 security mechanisms but is instead utilized for encrypting data at the IP layer.
Explanation: This is correct because, as per LWA security specifications, the S-KWT is used by both the UE and WT in a manner equivalent to either the PMK or PSK of IEEE 802.11, facilitating secure WLAN link establishment through mechanisms like the 4-way handshake, ensuring seamless integration of LTE and WLAN security contexts for aggregated connectivity.