name: AUTHENTICATION REQUEST
full_form: Authentication Request Message
context: The network initiates the authentication procedure by transferring an AUTHENTICATION REQUEST message across the radio interface and starts the timer T3260. The AUTHENTICATION REQUEST message contains the parameters necessary to calculate the response parameters (see 3GPP TS 43.020 [13] (in case of GSM authentication challenge) and 3GPP TS 33.102 [5a] (in case of an UMTS authentication challenge)). In a GSM authentication challenge, the AUTHENTICATION REQUEST message also contains the GSM ciphering key sequence number allocated to the key which may be computed from the given parameters. In a UMTS authentication challenge, the AUTHENTICATION REQUEST message also contains the ciphering key sequence number allocated to the key set of UMTS ciphering key, UMTS integrity key and GSM ciphering key which may be computed from the given parameters. Furthermore, the ciphering key sequence number is also linked to a GSM Kc128 if after the authentication procedure the network in A/Gb mode selects an A5 ciphering algorithm that requires a 128-bit ciphering key.
description: The AUTHENTICATION REQUEST message is sent by the network to initiate the authentication procedure. It contains parameters necessary for calculating response parameters and, in some cases, ciphering key sequence numbers.
explanation: Categorized as a Message because it is a specific data or signaling sent between network components to initiate an action.
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biotag_Description: O,B-Message,I-Message,I-Message,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O