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When NAS security mode fails, which procedure should we follow?

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When NAS security mode fails, which procedure should we follow?
posted May 20 by Narasimha K

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+1 vote

I was looking into NAS header. First four bits are used for security header type. Few values I understood but one value I could not understand which was 1100 saying "security header for service request message". I could not understand why such thing is defined only for service request message not for the other messages ?

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I am not able to find NAS Recovery message as such in 24.301 spec. Some weblink has talked about NAS recovery but I could not any reference in specification.
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+2 votes

In attach request, UE sends UE network capability which contains the list of security algorithms can be used to enable security between UE and network node. My question is, when UE already knows its supported algorithms then why MME resend the same list of security algorithm to UE in security mode command ? What would be the reasoning behind it ?

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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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