In this Video we will learn about the security procedures in LTE EPC and RAN. We will cover all he concepts related to Encryption, Integrity and Ciphering protection. For full course please visit -

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The LTE attach call flow explained. From RRC (Radio Resource Control) Connection Establishment to IP address assignment.
ADDITIONS/ERRATA:
26:00 - There is another mechanism allowed by standards for UE to obtain IP address, which is provided to the UE as part of "Activate Default EPS bearer request" message (step 23). The UE in "Activate PDN Context Request" (step 5) states if it wants (a) IP address allocated via the NAS message or (b) will use DHCPv4 after the Attach procedure is completed. For (a) the PGW provides IP address as part of step 21 which is relayed to UE in step 23. (a) is the typical approach used by most UEs and network.