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Does the active flag in TAU Request have any influence on the security mode procedure?

+2 votes
Does the active flag in TAU Request have any influence on the security mode procedure?
posted Sep 22, 2015 by Maninder Bath

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+3 votes

I have couple of question regarding security procedure in case of NAS and AS Security procedure.
1> In case of NAS security procedure, MME sends Security mode command to UE with with only integrity protected, and UE sends Security mode complete after integrity verification to eNB with both integrity protected and ciphered too, as MME shared the ciphered algo with UE in command message.

But in case of AS security procedure, eNB sends security mode command with integrity protected and UE reply with only integrity protected Security mode complete message though eNB shared ciphering algo with UE.

Why in case of AS Security mode complete message it is only integrity protected and not ciphered but in case NAS security Complete message is both ciphered and integrity protected ? Any special requirement/reason for it ?

2> In case of NAS, after security is established every NAS message goes through Ciphering first and then Integrity protection added but in case AS security RRC messages why it is first integrity protection and than ciphered ?

What is the reason behind different order of integrity protection and ciphering in case of NAS and AS ?

+3 votes

What UE is supposed to do when it move from a Tracking Area to another Tracking Area ?

+2 votes

Is it vendor specific or standard defined the behavior when UE does not report its location to MME even after TAU timer expires ?
Here assumed , LTE UE is out of coverage .

+4 votes

I saw a scenario where an Identity is requested by MME after successful Authentication and Security mode complete.. As a Response to this message UE is Sending IMEI? what is the need of checking IMEI number after successful authentication? If IMEI is in block list then ongoing Attach procedure is going to be Terminate...? Identity Request intention is mainly to check the IMEI belongs to any one of Black, while or Green list then why cannt MME check for this before Security Mode?

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