name: EIA0
full_form: Null Integrity Protection Algorithm
context: The network should initiate the security mode procedure for an emergency call, in the same way as it would for any other call except in the cases defined in sub-clause "Security Procedures Not Applied" in 3GPP TS 33.102 [5a]. For the establishment of a MM connection for an emergency call when no other MM connection is established (e.g. for an emergency call initiated without a SIM/USIM no other MM connections can exist) the decision on whether or not to apply the security procedures shall be made by the network as defined in the subclause "Emergency Call Handling" in 3GPP TS 33.102 [5a]. If the MM connection was established locally due to the SRVCC handover of a PDN connection for emergency bearer services for which the "null integrity protection algorithm" EIA0 has been used while in S1 mode or for which integrity protection has not been activated while in Iu mode, the network need not apply the security procedures for this call. If the MM connection was established locally due to the 5G-SRVCC handover from NG-RAN to UTRAN of an emergency PDU session for which the "null integrity protection algorithm" 5G-IA0 has been used while in N1 mode, the network need not apply the security procedures for this call. For an attach for emergency bearer services, (e.g. initiated without a SIM/USIM) the decision on whether or not to apply the security procedures shall be made by the network as defined in the subclause "Emergency Call Handling" in 3GPP TS 33.102 [5a]. After intersystem change from S1 mode to Iu mode with a PDN connection for emergency bearer services for which the "null integrity protection algorithm" EIA0 has been used while in S1 mode, the network need not apply the security procedures for this connection. For an initial registration for emergency services, (e.g. initiated without a SIM/USIM) the decision on whether or not to apply the security procedures shall be made by the network as defined in the clause J.2 of 3GPP TS 33.501 [170]. After 5G-SRVCC handover from NG-RAN to UTRAN with an emergency PDU session for which the "null integrity protection algorithm" 5G-IA0 has been used while in N1 mode, the network need not apply the security procedures for this connection.
description: The EIA0 algorithm is used in Iu mode to protect the integrity of emergency calls. It ensures that the call is not tampered with during transmission.
explanation: Categorized as an Algorithm because it defines a specific procedure for protecting data integrity.
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