In GSM, Integrity is not there. But in UMTS, Integrity is mandatory.
In case of Inter System Handover, when an UE comes from GSM to UMTS system, UTRAN should trigger the Security Mode Procedure to start integrity. This is solely UTRAN initiated procedure and not triggered by Core Network. The integrity key and algorithm used are the one which was received in Handover Request message. The Security Mode Command message should not include the ciphering info as this is to start integrity.
If ciphering was enabled on the GSM, then UE enabled ciphering immediately after receiving Handover To Utran Command message and consequently the next message Handover To Utran Complete sent by UE will be ciphered.
In case of Inter System Handover, when an UE comes from GSM to UMTS system, UTRAN should trigger the Security Mode Procedure to start integrity. This is solely UTRAN initiated procedure and not triggered by Core Network. The integrity key and algorithm used are the one which was received in Handover Request message. The Security Mode Command message should not include the ciphering info as this is to start integrity.
If ciphering was enabled on the GSM, then UE enabled ciphering immediately after receiving Handover To Utran Command message and consequently the next message Handover To Utran Complete sent by UE will be ciphered.
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