Nausf_SoRProtection
The Authentication Server Function (AUSF) acts as NF Service Producer. It provides SoRProtection service to the NF Service Consumer. This service permits to provide the NF Service Consumer (for example, UDM) with the SoR-MAC-IAUSFand CounterSoR to protect the the Steering Information List from being tampered with or removed by the VPLMN.
Note | If the Steering Information List is not available or HPLMN determines that no steering of the UE is required, a SOR transparent container information element with an HPLMN indication that no change of the "Operator Controlled PLMN Selector with Access Technology" list stored in the UE protected by SoR-MAC-IAUSF and CounterSoR is still sent to the UE during registration. The Steering Information List in such a case, the NF Service Consumer shall send an empty list to the AUSF when consuming the Nausf_SoRProtection Service. |
The service operation defined for the Nausf_SoRProtection is as follows:
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Protect: The Protect service operation is used in the following procedures:
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Procedure for steering of UE in VPLMN during registration (see subclause 6.14.2.1 of 3GPP TS 33.501 [8])
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Procedure for steering of UE in VPLMN after registration (see subclause 6.14.2.2 of 3GPP TS 33.501 [8])
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Reference: 3GPP TS 33.501 v15.5.0