name: IK'
full_form: replacement for IK for air interface security to withhold IK from the visited network
context: signature IE. The MME shall transfer UE's UTRAN and GERAN security capabilities and CK' || IK' with KSI equal to the value of the eKSI associated with the current EPS security context to SGSN with Context Response/SGSN Context Response message. The MME and UE shall derive CK' and IK' from the KASME and the NAS uplink COUNT value corresponding to the truncated NAS-token received by the MME from SGSN as specified in clause A.13. Keys CK' and IK' and KSI sent from the MME shall replace all the UTRAN PS key parameters CK, IK, s KSI in the target SGSN if any. Keys CK' and IK' and the KSI shall replace all the currently stored UTRAN PS key parameters CK, IK, KSI values on both USIM and ME. The handling of STARTPS shall comply with the rules in TS 25.331 [24]. The UE may set the STARTPS value to 0 if it is done before establishment of the RRC connection. The ME shall use CK' and IK' to derive the GPRS Kc using the c3 function specified in TS 33.102 [4]. The ME shall assign the eKSI value
description: IK' is a security parameter used for air interface security, specifically as a replacement for IK to withhold it from the visited network. It is derived from the KASME and NAS uplink COUNT value corresponding to the truncated NAS-token received by the MME from SGSN.
explanation: The text explicitly states that IK' is a parameter used in UTRAN PS key management, replacing existing IK values in both USIM and ME. This indicates its role as a critical network attribute for operation, fitting the definition of a Parameter.
section_title: 9.1.1	RAU procedures in UTRAN
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