name: CKSRVCC
full_form: Cipher Key for Single Radio Voice Continuity
context: message with that estimated NAS downlink COUNT. In particular, the stored NAS downlink COUNT shall never be decreased. UE and MME shall assign the value of eKSI to KSI. MME shall transfer CKSRVCC, IKSRVCC with KSI and the UE security capability to the MSC server enhanced for SRVCC. The MSC server enhanced for SRVCC shall replace all the stored UTRAN CS key parameters CK, IK, KSI, if any, with CKSRVCC, IKSRVCC, KSI received from the MME when the SRVCC handover is successful. The UE shall replace all the stored UTRAN CS key parameters CK, IK, KSI, if any, with CKSRVCC, IKSRVCC, KSI in both ME and USIM. STARTCS shall comply with the rules in TS 25.331 [24]. The ME shall use CKSRVCC and IKSRVCC to derive the GSM CS Kc using the c3 function specified in TS 33.102 [4]. The ME shall assign the eKSI value (associated with CKSRVCC and IKSRVCC) to the GSM CS CKSN (associated with the GSM CS Kc). The ME shall update the USIM and ME with the GSM CS Kc and GSM CS CKSN. NOTE 2: The new derived
description: CKSRVCC is a cipher key used for Single Radio Voice Continuity (SRVC) in handovers between E-UTRAN and Circuit Switched UTRAN/GERAN. It derives GSM CS Kc using the c3 function specified in TS 33.102.
explanation: The text describes CKSRVCC as a cipher key specifically used for SRVC, a feature related to secure communication during network handovers. Its role in deriving GSM CS Kc further reinforces its classification as a cipher key.
section_title: 14.1	From E-UTRAN to Circuit Switched UTRAN/GERAN
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