Section: 5.4.1.2.4 EAP message reliable transport procedure
Content: 5.4.1.2.4.1 General The purpose of the EAP message reliable transport procedure is to provide a reliable transport of an EAP-request message, the ngKSI and the ABBA from the network to the UE and of an EAP-response message from the UE to the network. The EAP message reliable transport procedure is initiated by an AUTHENTICATION REQUEST message with the EAP message IE. 5.4.1.2.4.2 EAP message reliable transport procedure initiation by the network In order to initiate the EAP message reliable transport procedure, the AMF shall create an AUTHENTICATION REQUEST message. The AMF shall set the EAP message IE of the AUTHENTICATION REQUEST message to the EAP-request message to be sent to the UE. The AMF shall set the ngKSI IE of the AUTHENTICATION REQUEST message to the ngKSI value selected in subclause 5.4.1.2.2.2, subclause 5.4.1.2.3.1 or subclause 5.4.1.2.3A.1. In this release of specification, the AMF shall set the ABBA IE of the AUTHENTICATION REQUEST message with the length of ABBA IE to 2 and the ABBA contents to be 2 octets in length with value 0000H as described in subclause 9.11.3.10. The AMF shall send the AUTHENTICATION REQUEST message to the UE, and the AMF shall start timer T3560 (see example in figure 5.4.1.2.4.2.1). Figure 5.4.1.2.4.2.1: EAP message reliable transport procedure Upon receipt of an AUTHENTICATION REQUEST message with the EAP message IE, the UE handles the EAP message received in the EAP message IE and the ABBA of the AUTHENTICATION REQUEST message.