Section: 5.5.4.6 Abnormal cases in the UE
Content: The following abnormal cases in the UE can be identified: a) Transmission failure of RELAY KEY REQUEST message or RELAY KEY AUTHENTICATION RESPONSE message indication from lower layers. The UE shall abort the authentication and key agreement procedure for 5G ProSe UE-to-network relay and perform the PC5 signalling protocol procedure as specified in subclause 7.2.2.5 of 3GPP 24.554 [19E]. b) Expiry of timer T3527. The UE shall, on the first expiry of the timer T3527, retransmit the RELAY KEY REQUEST message or the RELAY KEY AUTHENTICATION RESPONSE message and shall reset and start timer T3527. This retransmission is repeated four times, i.e. on the fifth expiry of timer T3527, the procedure shall be aborted. c) Collision between the authentication and key agreement procedure for 5G ProSe UE-to-network relay or 5G ProSe UE-to-UE relay and de-registration procedure. The UE shall abort the authentication and key agreement procedure for 5G ProSe UE-to-network relay or 5G ProSe UE-to-UE relay, proceed with the network initiated de-registration procedure, and perform the PC5 signalling protocol procedure as specified in subclause 7.2.2.5 of 3GPP 24.554 [19E].