name: 3GPP TS 24.008
full_form: Third Generation Partnership Project Technical Specification 24.008
context: At inter-system change from Iu mode to A/Gb mode, ciphering may be started (see 3GPP TS 44.018 [84]) without any new authentication procedure. Deduction of the appropriate security key for ciphering in A/Gb mode, depends on the current GSM/UMTS security context stored in the MS and the network. The ME shall handle the GSM ciphering key and a potential GSM Kc128 according to table 4.3.2.7.1. Table 4.3.2.7.1/3GPP TS 24.008: Inter-system change from Iu mode to A/Gb mode NOTE: A USIM with UMTS security context, passes the UMTS ciphering key, the UMTS integrity key and the derived GSM ciphering key to the ME independent on the current radio access being UTRAN or GERAN.
description: The 3GPP TS 24.008 is a technical specification document published by the Third Generation Partnership Project, outlining procedures and protocols for intersystem changes between UMTS and GSM/UMTS systems.
explanation: Categorized as a Standard because it represents an official document defining network specifications.
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