name: CKSN
full_form: Cipher key sequence number
context: key conversion function c3 as specified in TS 33.102 [4], and assign the value of eKSI to GSM CS CKSN associated with the GSM CS Kc, and the target MSC server and UE shall compute the 128-bit GSM CS cipher key Kc128 as specified in TS 33.102 [4] when the new encryption algorithm selected by the target BSS requires Kc128. The UE and the enhanced MSC Server shall assign the value of eKSI to GSM CS CKSN associated with the GSM CS Kc128. Non-voice bearers may be handed over during the SRVCC handover operation. For this case, k ey derivation for non-voice bearers is specified in clause 9.2.1 and 10.3.1 of the present specification. If non-voice bearers are not handed over during the SRVCC handover operation and if the UE subsequently resumes PS services in UTRAN/GERAN, key derivation for the PS domain is specified in clause 9.1.1 and 10.2.1 of the present specification. If the SRVCC handover is not completed successfully, the new mapped CKSRVCC, IKSRVCC and KSISRVCC can not be used in the
description: The Cipher Key Sequence Number (CKSN) is a critical network attribute for secure communication in GSM CS networks. It is associated with the GSM CS cipher key Kc or Kc128 and plays a crucial role in key derivation and conversion processes during handover operations, such as SRVCC.
explanation: The context explicitly mentions CKSN in relation to key management and conversion functions within the network, specifically highlighting its association with GSM CS cipher keys. This indicates that CKSN is a parameter used for secure communication and key derivation purposes.
section_title: 14.1	From E-UTRAN to Circuit Switched UTRAN/GERAN
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