This test case is used for validating the components of an EPC or an eNB for a valid attach procedure.

In this test case, ABot can simulate the eNB and UE and any other node of the 4G EPC like MME, SGW, PDN-GW, HSS and PCRF. The eNB and UE sends an Initial Attach request message with a valid IMSI value. The eNB and UE receives an Attach Accept message, in an ideal case. Now, eNodeB to send a UE Context Release Request to the MME for S1 release procedure

The procedures completed in this test case are –

• Diameter Capabilities Exchange
• S1-Setup
• Initial UE Message
• Authentication Information Retrieval
• Authentication procedure(AKA)
• Tunnel Management
• IP CAN Session
• S1 release procedure

This test case is executed as per 3GPP TS 23.401

Protocol Used	Nodes Involved	Interfaces Involved
S1AP, Diameter, GTPv2C, NAS	MME, eNodeB, SGW, PGW, HSS, PCRF	S1-MME, S11, Gx, S5/S8, S6a