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Content for  TS 23.304  Word version:  18.4.0

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4.2.7 5G ProSe UE-to-Network Relay reference architecture  4.2.7.1 5G ProSe Layer-3 UE-to-Network Relay reference architecture  4.2.7.2 5G ProSe Layer-2 UE-to-Network Relay reference architecture  4.2.8 5G ProSe UE-to-UE Relay reference architecture 
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4.2.7  5G ProSe UE-to-Network Relay reference architecture  p. 21

4.2.7.1  5G ProSe Layer-3 UE-to-Network Relay reference architecture  p. 21

The following Figure 4.2.7.1-1 shows the high level reference architecture for 5G ProSe Layer-3 UE-to-Network Relay. In this Figure, the 5G ProSe Layer-3 UE-to-Network Relay may be in the HPLMN or a VPLMN.
Copy of original 3GPP image for 3GPP TS 23.304, Fig. 4.2.7.1-1: Reference architecture for 5G ProSe Layer-3 UE-to-Network Relay
Figure 4.2.7.1-1: Reference architecture for 5G ProSe Layer-3 UE-to-Network Relay
(⇒ copy of original 3GPP image)
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The following Figure 4.2.7.1-2 shows the non-roaming reference architecture for 5G ProSe Layer-3 UE-to-Network Relay when N3IWF is supported. In this Figure, the PLMN A and PLMN B may be the same or different. When the 5G ProSe Layer-3 Remote UE may connect to NG-RAN directly to access PLMN B and in that case it would take the role of UE in the Figure. The N3IWF may be connected to Relay UE UPF via a Data Network.
Copy of original 3GPP image for 3GPP TS 23.304, Fig. 4.2.7.1-2: Non-roaming architecture model for 5G ProSe Layer-3 UE-to-Network Relay with N3IWF support
Figure 4.2.7.1-2: Non-roaming architecture model for 5G ProSe Layer-3 UE-to-Network Relay with N3IWF support
(⇒ copy of original 3GPP image)
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The following Figure 4.2.7.1-3 shows the roaming reference architecture for 5G ProSe Layer-3 UE-to-Network Relay. In this Figure, the PLMN A and PLMN B may be the same or different and/or the PLMN A and PLMN C may be the same or different. The N3IWF may be connected to Relay UE UPF via a Data Network.
Copy of original 3GPP image for 3GPP TS 23.304, Fig. 4.2.7.1-3: Roaming architecture model for 5G ProSe Layer-3 UE-to-Network Relay with N3IWF support
Figure 4.2.7.1-3: Roaming architecture model for 5G ProSe Layer-3 UE-to-Network Relay with N3IWF support
(⇒ copy of original 3GPP image)
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4.2.7.2  5G ProSe Layer-2 UE-to-Network Relay reference architecture  p. 23

Figure 4.2.7.2-1 shows the 5G ProSe Layer-2 UE-to-Network Relay reference architecture. The 5G ProSe Layer-2 Remote UE and 5G ProSe Layer-2 UE-to-Network Relay may be served by the same or different PLMNs. If the serving PLMNs of the 5G ProSe Layer-2 Remote UE and the 5G ProSe Layer-2UE-to-Network Relay are different then NG-RAN is shared by the serving PLMNs, see the 5G MOCN architecture in clause 5.18 of TS 23.501.
Copy of original 3GPP image for 3GPP TS 23.304, Fig. 4.2.7.2-1: 5G ProSe Layer-2 UE-to-Network Relay reference architecture
Figure 4.2.7.2-1: 5G ProSe Layer-2 UE-to-Network Relay reference architecture
(⇒ copy of original 3GPP image)
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4.2.8  5G ProSe UE-to-UE Relay reference architecture |R18|  p. 24

Figure 4.2.8-1 shows the Layer-2 and Layer-3 5G ProSe UE-to-UE Relay reference architecture. The 5G ProSe End UEs communicate with each other via a 5G ProSe UE-to-UE Relay.
Copy of original 3GPP image for 3GPP TS 23.304, Fig. 4.2.8-1: Reference architecture for 5G ProSe UE-to-UE Relay
Figure 4.2.8-1: Reference architecture for 5G ProSe UE-to-UE Relay
(⇒ copy of original 3GPP image)
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Each 5G ProSe End UE and the 5G ProSe UE-to-UE Relay may have subscriptions from the same PLMN or different PLMNs.

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