AS Security Mode Procedure

//AS Security Mode Procedure

AS Security Mode Procedure

AS Security Mode Procedure

AS Security Mode Procedure

After the UE context has been created, the MME sends the Initial Context Setup Request message (S1- AP) which contains the S1AP identifiers, the AMBR for the UE, and details of the Radio Access Bearers that the MME has approved for set-up, including the TEIDs associated with the RABs that are being set up.

The eNB then sends a security mode command. The Enb selects the integrity and encryption algorithms to be used. Selection is done based on the prioritized list sent by the MME and the security capabilities of the UE.

The UE makes a note of the selected encryption and integrity algorithms, and generates the keys required for these algorithms. It acknowledges the reception of the NAS Security Mode Command by sending a NAS Security Mode Complete message.

This message is integrity protected. After sending the security mode command and after receiving the security mode complete message, the eNodeB will trigger counters for security mode commands sent and the security mode complete.

If failure is detected, the cause for this is normally stated and an associated counter pegged.

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