TS 23.304
Proximity based Services (ProSe) in the 5G System (5GS)
V19.4.0 (Wzip)
2025/06 195 p.
V18.8.0 (PDF)
2025/03 150 p.
V17.8.0
2023/09 108 p.
- Rapporteur:
- Miss Liu, Jianhua
Guangdong OPPO Mobile Telecom.
essential Table of Contents for TS 23.304 Word version: 19.3.0
each title, in the "available" or "not available yet" area, links to the equivalent title in the CONTENT
List of Figures and Tables
| Figure 4.2.1-1 | Non-roaming 5G System architecture for Proximity-based Services |
| Figure 4.2.1-2 | Non-roaming 5G System architecture for Proximity-based Services in reference point representation |
| Figure 4.2.2-1 | Roaming 5G System architecture for Proximity-based Services |
| Figure 4.2.3-1 | Non-roaming Inter-PLMN 5G System architecture for Proximity-based Services |
| Figure 4.2.3-2 | Roaming Inter-PLMN 5G System architecture for Proximity-based Services |
| Figure 4.2.4-1 | 5G System architecture for AF-based service parameter provisioning for 5G ProSe communications |
| Figure 4.2.7.1-1 | Reference architecture for 5G ProSe Layer-3 UE-to-Network Relay |
| Figure 4.2.7.1-2 | Non-roaming architecture model for 5G ProSe Layer-3 UE-to-Network Relay with N3IWF support |
| Figure 4.2.7.1-3 | Roaming architecture model for 5G ProSe Layer-3 UE-to-Network Relay with N3IWF support |
| Figure 4.2.7.1A-1 | Reference architecture for 5G ProSe multi-hop Layer-3 UE-to-Network Relay |
| Figure 4.2.7.2-1 | 5G ProSe Layer-2 UE-to-Network Relay reference architecture |
| Figure 4.2.8-1 | Reference architecture for 5G ProSe UE-to-UE Relay |
| Figure 4.2.8A-1 | Reference architecture for Layer-3 5G ProSe Multi-hop UE-to-UE Relay |
| Table 5.6.1-1 | Standardized PQI values that are additionally defined to QoS characteristics mapping |
| Figure 5.6.2.1-1 | End-to-End QoS translation for 5G ProSe Layer-3 UE-to-Network Relay operation |
| Figure 5.6.2.2-1 | End-to-End QoS support via Layer-3 UE-to-Network Relay with N3IWF |
| Figure 5.6.2.4-1 | End-to-End QoS translation for 5G ProSe Multi-hop Layer-3 UE-to-Network Relay operation |
| Figure 5.6.3.1-1 | End-to-End QoS for 5G ProSe Layer-3 UE-to-UE Relay operation |
| Figure 5.6.3.1-2 | End-to-End QoS for Multi-hop 5G ProSe Layer-3 UE-to-UE Relay for non-IP type PDU operation |
| Figure 5.16-1 | Example scenario of communication path switching between PC5 and Uu reference points (i.e. switching between Figure a and Figure b) |
| Figure 5.17.1-1 | Multi-path communication via Uu and via 5G ProSe UE-to-Network Relay |
| Figure 6.1.1.2.1-1 | Discovery Plane PC5 Interface |
| Figure 6.1.1.3-1 | Control Plane for PC3a Interface |
| Figure 6.1.1.7.1-1 | Control plane protocol stacks between 5G ProSe Layer-3 Remote UE and N3IWF over 5G ProSe Layer-3 UE-to-Network Relay before the signalling IPSec SA is established |
| Figure 6.1.1.7.1-2 | Control plane protocol stacks between 5G ProSe Layer-3 Remote UE and N3IWF over 5G ProSe Layer-3 UE-to-Network Relay after the signalling IPSec SA is established |
| Figure 6.1.1.7.2-1 | End-to-End Control Plane for a Remote UE using Layer-2 UE-to-Network Relay |
| Figure 6.1.1.8.1-1 | End-to-End Control Plane protocol stacks using a 5G ProSe Layer-2 UE-to-UE Relay |
| Figure 6.1.2.2-1 | User Plane for NR PC5 reference point |
| Figure 6.1.2.3.1-1 | User plane protocol stack for Layer-3 UE-to-Network Relay |
| Figure 6.1.2.3.1-2 | User plane protocol stacks for Layer-3 UE-to-Network Relay with N3IWF support |
| Figure 6.1.2.3.2-1 | End-to-End User Plane Stack for a 5G ProSe Remote UE using 5G ProSe Layer-2 UE-to-Network Relay |
| Figure 6.1.2.4.1-1 | End-to-End User Plane protocol stacks using a 5G ProSe Layer-2 UE-to-UE Relay |
| Figure 6.2.4-1 | UE triggered 5G ProSe Policy provisioning procedure |
| Figure 6.3.1.2-1 | Overall procedure for Model A 5G ProSe Direct Discovery |
| Figure 6.3.1.3-1 | Overall procedure for Model B 5G ProSe Direct Discovery |
| Figure 6.3.2.1-1 | 5G ProSe direct discovery with Model A |
| Figure 6.3.2.1-2 | 5G ProSe direct discovery with Model B |
| Figure 6.3.2.2.2-1 | Group Member Discovery with Model A |
| Figure 6.3.2.2.3-1 | Group Member Discovery with Model B |
| Figure 6.3.2.3.2-1 | 5G ProSe UE-to-Network Relay Discovery with Model A |
| Figure 6.3.2.3.3-1 | 5G ProSe UE-to-Network Relay Discovery with Model B |
| Figure 6.3.2.4.2-1 | 5G ProSe UE-to-UE Relay Discovery with Model A |
| Figure 6.3.2.4.3-1 | 5G ProSe UE-to-UE Relay Discovery with Model B |
| Figure 6.3.2.5.2-1 | 5G ProSe multi-hop UE-to-Network Relay discovery procedure with Model A |
| Figure 6.3.2.5.3-1 | General Procedures for 5G ProSe Multi-hop UE-to-Network Relay Discovery with Model B |
| Figure 6.3.2.5.4-1 | Procedure for additional parameters announcement for multi-hop UE-to-Network relaying |
| Figure 6.3.2.6.2-1 | 5G ProSe Multi-hop UE-to-UE Relay Discovery of IP PDU type with Model A |
| Figure 6.3.2.6.2-2 | 5G ProSe Multi-hop UE-to-UE Relay Discovery of IP PDU type with Model B |
| Figure 6.3.2.6.3.1-1 | 5G ProSe multi-hop UE-to-UE Relay Discovery of non-IP PDU type with Model A |
| Figure 6.3.2.6.3.2-1 | Multi-hop 5G ProSe UE-to-UE Relay Discovery of non-IP PDU type with Model B |
| Figure 6.4.1-1 | Procedure for Broadcast mode of 5G ProSe direct communication over PC5 reference point |
| Figure 6.4.2-1 | Procedure for groupcast mode 5G ProSe Direct communication |
| Figure 6.4.3.1-1 | Layer-2 link establishment procedure |
| Figure 6.4.3.2-1 | Link identifier update procedure |
| Figure 6.4.3.3-1 | Layer-2 link release procedure |
| Figure 6.4.3.4-1 | Layer-2 link modification procedure |
| Figure 6.4.3.5-1 | Layer-2 link maintenance procedure |
| Figure 6.4.3.8.3-1 | Relay reselection for 5G ProSe Remote UE with 5G ProSe Multi-hop UE-to-Network Relays without Root Relay change |
| Figure 6.4.3.8.3-2 | Relay reselection for 5G ProSe Remote UE with 5G ProSe Multi-hop UE-to-Network Relays with Root Relay change |
| Figure 6.5.1.1-1 | 5G ProSe Communication via 5G ProSe Layer-3 UE-to-Network Relay without N3IWF |
| Figure 6.5.1.2.1-1 | Connection establishment over 5G ProSe Layer-3 UE-to-Network Relay with N3IWF support |
| Figure 6.5.1.3-1 | Additional parameters announcement procedure |
| Figure 6.5.1.4-1 | Connection establishment via Multi-hop 5G ProSe Layer-3 UE-to-Network Relay without N3IWF support |
| Figure 6.5.1.5-1 | 5G ProSe Communication via Multi-hop 5G ProSe Layer-3 UE-to-Network Relay with N3IWF support |
| Figure 6.5.2.2-1 | Connection Establishment for 5G ProSe Layer-2 UE-to-Network Relay |
| Figure 6.7.1.1-1 | Layer-2 link establishment via 5G ProSe Layer-3 UE-to-UE Relay |
| Figure 6.7.1.2-1 | Link Identifier Update and IP address/prefix sharing via 5G ProSe Layer-3 UE-to-UE Relay |
| Figure 6.7.1.3-1 | Layer-2 Link Release procedure via 5G ProSe Layer-3 UE-to-UE Relay |
| Figure 6.7.1.4-1 | Layer-2 link modification procedure via Layer-3 UE-to-UE Relay |
| Figure 6.7.2-1 | 5G ProSe Communication via 5G ProSe Layer-2 UE-to-UE Relay |
| Figure 6.7.3.2-1 | 5G ProSe UE-to-UE Relay Communication with integrated Discovery via Layer-3 UE-to-UE Relay |
| Figure 6.7.3.3-1 | 5G ProSe UE-to-UE Relay Communication with integrated Discovery via Layer-2 UE-to-UE Relay |
| Figure 6.7.4.2-1 | Negotiated 5G ProSe Layer-2 UE-to-UE Relay reselection |
| Figure 6.7.4.3-1 | Negotiated 5G ProSe Layer-3 UE-to-UE Relay reselection |
| Figure 6.7.4.4-1 | Negotiated multihop Layer-3 UE-to-UE Relay reselection procedure. |
| Figure 6.7.5.2.1-1 | 5G ProSe Communication via IP type of 5G ProSe Multi-hop UE-to-UE Relay |
| Figure 6.7.5.2.2-1 | Layer-2 link establishment via 5G ProSe Layer-3 UE-to-UE Relay for Non-IP Type PDU |
| Figure 6.8.1-1 | Procedure for communication path switching from Uu reference point to PC5 reference point |
| Figure 6.8.2-1 | Procedure for communication path switching from PC5 reference point to Uu reference point |
| Table 7.1.1-1 | Services provided by 5G DDNMF |
| Table 7.2.1-1 | Services provided by AF |