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Content for  TS 23.304  Word version:  18.5.1

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5.1.4  Authorization and Provisioning for 5G ProSe UE-to-Network Relayp. 37

5.1.4.1  Policy/Parameter provisioning for 5G ProSe UE-to-Network Relayp. 37

The following information is provisioned in the UE in support of the UE assuming the role of a 5G ProSe UE-to-Network Relay:
  1. Authorisation policy for acting as a 5G ProSe Layer-3 and/or Layer-2 UE-to-Network Relay when "served by NG-RAN":
    • PLMNs in which the UE is authorized to relay traffic for 5G ProSe Layer-3 and/or Layer-2 Remote UEs.
      The authorisation for a UE to act as a 5G ProSe UE-to-Network Relay also authorizes the use of 5G ProSe UE-to-Network Relay Discovery with Model A and Model B.
  2. ProSe Relay Discovery policy/parameters for 5G ProSe UE-to-Network Relay:
    • Includes the parameters that enable the UE to perform 5G ProSe UE-to-Network Relay Discovery when provided by PCF or provisioned in the ME or configured in the UICC:
      • 5G ProSe UE-to-Network Relay Discovery parameters (User Info ID, Relay Service Code(s), UE-to-Network Relay Layer Indicator per RSC, optional Control Plane Security Indicator per RSC). The UE-to-Network Relay Layer Indicator indicates whether the associated RSC is offering 5G ProSe Layer-2 or Layer-3 UE-to-Network Relay service. If the Control Plane Security Indicator is provided for a RSC, then the Control Plane based security procedure as described in clause 5.1.4.3.2 is performed for UE-to-Network Relay Communication for that RSC, otherwise if it is not provided for a RSC, then the User Plane based security procedure as described in clause 5.1.4.3.3 is performed for that RSC. RSC dedicated for emergency service may also be provisioned.
      • Default Destination Layer-2 ID(s) for sending Relay Discovery Announcement and Relay Discovery Additional Information messages and receiving Relay Discovery Solicitation messages;
      • For 5G ProSe Layer-3 UE-to-Network Relay, the PDU Session parameters (PDU Session type, DNN, SSC Mode, S-NSSAI, Access Type Preference) to be used for the relayed traffic for each ProSe Relay Service Code;
      • Includes security related content for 5G ProSe UE-to-Network Relay, see TS 33.503.
  3. For 5G ProSe Layer-3 UE-to-Network Relay, QoS mapping(s):
    • Each QoS mapping entry includes:
      • a mapping between a 5QI value and a PQI value;
      • a PQI PDB adjustment factor, for the PC5 communication for the 5G ProSe Layer-3 UE-to-Network Relay operation;
      • optional the Relay Service Code(s) associates with the QoS mapping entry.
  4. For 5G ProSe Layer-3 UE-to-Network Relay to relay Ethernet or Unstructured traffic from 5G ProSe Layer-3 Remote UE by using IP type PDU Session:
    • Mapping of ProSe Service(s) to ProSe Application Server address information (consisting of IP address/FQDN and transport layer port number).
  5. Parameters to broadcast warning messages:
    • Configured Destination Layer-2 ID(s);
    • PC5 QoS parameters defined in clause 5.6.1;
    • the NR Tx Profile based on the configuration as specified in clause 5.1.3.1.
  6. Validity time indicating the expiration time of the Policy/Parameter for 5G ProSe UE-to-Network Relay discovery and communication.
The following information is provisioned in the UE in support of the UE assuming the role of a 5G ProSe Remote UE and thereby enabling the use of a 5G ProSe UE-to-Network Relay:
  1. Authorisation policy for using a 5G ProSe Layer-3 and/or Layer-2 UE-to-Network Relay:
    • For 5G ProSe Layer-3 Remote UE, indicates whether the UE is authorised to use a 5G ProSe Layer-3 UE-to-Network Relay.
    • For 5G ProSe Layer-2 Remote UE, indicates the PLMNs in which the UE is authorized to use a 5G ProSe Layer-2 UE-to-Network Relay.
      The authorisation for a UE to act as a 5G ProSe Remote UE also authorizes the use of 5G ProSe UE-to-Network Relay discovery with Model A and Model B.
  2. Policy/parameters for 5G ProSe UE-to-Network Relay Discovery:
    • Includes the parameters for 5G ProSe Relay Discovery and for enabling the UE to connect to the 5G ProSe UE-to-Network Relay after discovery when provided by PCF or provisioned in the ME or configured in the UICC:
      • 5G ProSe UE-to-Network Relay Discovery parameters (User Info ID, Relay Service Code(s), UE-to-Network Relay Layer indicator per RSC, optional Control Plane Security Indicator per RSC). The UE-to-Network Relay Layer Indicator indicates whether the associated RSC is offering 5G ProSe Layer-2 or Layer-3 UE-to-Network Relay service. If the Control Plane Security Indicator is provided for a RSC, then the Control Plane based security procedures as described in clause 5.1.4.3.2 is performed for UE-to-Network Relay Communication for that RSC, otherwise if it is not provided for a RSC, then the User Plane based security procedures as described in clause 5.1.4.3.3 is performed for that RSC. RSC(s) dedicated for emergency service may be provisioned to enable the support of emergency services for UE-to-Network Relaying.
      • Default Destination Layer-2 ID(s) for sending Relay Discovery Solicitation messages and receiving Relay Discovery Announcement and Relay Discovery Additional Information messages;
      • For 5G ProSe Layer-3 UE-to-Network Relay, the PDU Session parameters (PDU Session type, DNN, SSC Mode, S-NSSAI, Access Type Preference) to be used for the relayed traffic without using N3IWF access, or an indication of N3IWF access, for each ProSe Relay Service Code;
      • For 5G ProSe Layer-3 UE-to-Network Relay, optionally the ProSe application Traffic Descriptor(s) (as defined in TS 23.503) to be used for the relayed traffic for each ProSe Relay Service Code;
      • Includes security related content for 5G ProSe UE-to-Network Relay, see TS 33.503.
  3. Policy/parameters for N3IWF selection for 5G ProSe Layer-3 Remote UE:
    • N3IWF identifier configuration for 5G ProSe Layer-3 Remote UE (either FQDN or IP address) in the HPLMN.
    • 5G ProSe Layer-3 UE-to-Network Relay access node selection information - a prioritized list of PLMNs for N3IWF selection. It also indicates if selection of an N3IWF in a PLMN should be based on Tracking Area Identity FQDN or on Operator Identifier FQDN.
  4. Parameters to receive warning messages:
    • Configured Destination Layer-2 ID(s);
    • PC5 QoS parameters defined in clause 5.6.1;
    • the NR Tx Profile based on the configuration as specified in clause 5.1.3.1.
  5. Validity time indicating the expiration time of the Policy/Parameter for 5G ProSe UE-to-Network Relay discovery and communication.
The following information is provisioned in the UE in support of the UE assuming the role of a 5G ProSe UE-to-Network Relay as well as in the UE in support of the UE assuming the role of a 5G ProSe Remote UE and thereby enabling the use of a 5G ProSe UE-to-Network Relay:
  1. Radio parameters for 5G ProSe UE-to-Network Relay Discovery when the UE is not "served by NG-RAN":
    • Includes the radio parameters NR PC5 with Geographical Area(s) and an indication of whether they are "operator managed" or "non-operator managed". The UE uses the radio parameters to perform 5G ProSe Direct Discovery over PC5 reference point when "not served by NG-RAN" only if the UE can reliably locate itself in the corresponding Geographical Area. Otherwise, the UE is not authorized to transmit.
    • Default PC5 DRX configuration (see TS 38.331).
  2. Radio parameters for 5G ProSe UE-to-Network Relay communication when the UE is not "served by NG-RAN":
    • Includes the radio parameters NR PC5 with Geographical Area(s) and an indication of whether they are "operator managed" or "non-operator managed". The UE uses the radio parameters to perform 5G ProSe Direct Communication over PC5 reference point when "not served by NG-RAN" only if the UE can reliably locate itself in the corresponding Geographical Area. Otherwise, the UE is not authorized to transmit.
  3. Policy/parameters related to privacy:
    • A privacy timer value indicating the duration after which the UE shall change each source Layer-2 ID self-assigned by the UE when privacy is required.
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5.1.4.2  Principles for applying parameters for 5G ProSe UE-to-Network Relayp. 39

5.1.4.2.1  Principles for applying parameters for ProSe UE-to-Network Relay discoveryp. 39
The general principles for applying policy/parameters defined in clause 5.1.1a apply to the 5G ProSe UE-to-Network Relay discovery service.
5.1.4.2.2  Principles for applying parameters for 5G ProSe UE-to-Network Relay communicationp. 39
The general principles for applying policy/parameters defined in clause 5.1.1a apply to the 5G ProSe UE-to-Network Relay communication service.

5.1.4.3  Network controlled security procedures for 5G ProSe UE-to-Network Relayp. 39

5.1.4.3.1  Generalp. 39
Security procedures over Control Plane and User Plane are specified for 5G ProSe UE-to-Network relaying in TS 33.503.
5.1.4.3.2  Control Plane based security procedures for 5G ProSe UE-to-Network Relayp. 40
Control Plane-based security procedures for 5G ProSe UE-to-Network Relay call flow and procedure are defined in TS 33.503, characterised by the following principles:
  • 5G ProSe UE-to-Network Relay's NAS signalling is used for the control plane based security procedure to authenticate and authorize a 5G ProSe Remote UE.
  • A UE assuming the role of 5G ProSe UE-to-Network Relay can be configured to use a set of slices supporting Control Plane based security procedure. An AMF supporting Control Plane based security procedure for a 5G ProSe UE-to-Network Relay is selected as part of the slice. The 5G ProSe UE-to-Network Relay shall include in discovery messages the RSCs with the Control Plane Security Indicator set, as specified in clause 5.1.4.1, when the requested slice(s) corresponds to Control Plane based security procedure is(are) accepted. In addition, the 5G ProSe UE-to-Network Relay shall includes in discovery messages the RSCs without Control Plane Security Indicator as specified in clause 5.1.4.1.
  • A 5G ProSe-enabled UE shall use Control Plane based security procedures if a RSC with Control Plane Security Indicator set is used by the Remote UE to establish the connection. Otherwise, if a RSC without Control Plane Security Indicator is used by the Remote UE to establish the connection, the 5G ProSe-enabled UEs shall use User Plane based security procedures as specified in clause 5.1.4.3.3.
  • The AMF serving the 5G ProSe UE-to-Network Relay selects AUSF as specified in clause 6.3.4 of TS 23.501 using the identification information the 5G ProSe Remote UE provided as specified in clause 6.3.3.3.2 of TS 33.503.
  • If the 5G ProSe Remote UE is configured by HPLMN to use control plane security procedure, the 5G ProSe Remote UE's HPLMN AUSF shall support control plane based security procedure.
  • If a network intends to use control plane security procedure, then all the AMFs within the network slices that the 5G ProSe UE-to-Network Relay uses shall support the control plane based security procedures.
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5.1.4.3.3  User Plane based security proceduresp. 40
User Plane-based security procedures for 5G ProSe UE-to-Network Relay are defined in TS 33.503.

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