name: MRK
full_form: MBMS Request Key
context: is used by the BM-SC and the UICC as the key MUK (MBMS User Key) to protect MSK (MBMS Service Key) deliveries to the UICC as described within clause 6.3. The key Ks_ext_NAF is used as the key MRK (MBMS Request Key) within the protocols as described within clause 6.2. In case the UICC does not support MBMS then the key Ks_int_NAF can not be used for ME based key management, but the key Ks_ext_NAF shall be used as MUK and the key MRK is derived from the key Ks_ext_NAF by the BM-SC and the ME as specified in Annex F of this specification. A run of GBA_ME or 2G GBA results in the BM-SC sharing a key Ks_NAF with the ME. Both the BM-SC and the ME use the key Ks_NAF as MUK. The key MRK is derived from the key Ks_NAF by the BM-SC and the ME as specified in Annex F of this specification. The key MUK is used to protect MSK deliveries to the ME as described within clause 6.3. The key MRK is used to authenticate the UE towards the BM-SC within the protocols as described within clause 6.2. The MUK
description: The MBMS Request Key (MRK) is a critical network attribute used for protecting MSK deliveries and authenticating the UE towards the BM-SC in the context of Multimedia Broadcast Multicast Service (MBMS). It is derived from the key Ks_NAF by the BM-SC and the ME as specified in Annex F of this specification.
explanation: MRK is classified as a Parameter based on its role as a critical network attribute used for specific operations within the MBMS context, such as protecting MSK deliveries and authenticating the UE towards the BM-SC.
section_title: 6.1	Using GBA for MBMS
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biotag_Description: O,B-Parameter,I-Parameter,I-Parameter,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,B-Device,O,O,B-Network Function,O,O,O,O,B-Service,I-Service,I-Service,I-Service,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,B-Network Function,O,O,O,O,O,O,O,O