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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

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List of Figures and Tables

Figure 4.2.1-1Non-roaming 5G System architecture for Proximity-based Services
Figure 4.2.1-2Non-roaming 5G System architecture for Proximity-based Services in reference point representation
Figure 4.2.2-1Roaming 5G System architecture for Proximity-based Services
Figure 4.2.3-1Non-roaming Inter-PLMN 5G System architecture for Proximity-based Services
Figure 4.2.3-2Roaming Inter-PLMN 5G System architecture for Proximity-based Services
Figure 4.2.4-15G System architecture for AF-based service parameter provisioning for 5G ProSe communications
Figure 4.2.7.1-1Reference architecture for 5G ProSe Layer-3 UE-to-Network Relay
Figure 4.2.7.1-2Non-roaming architecture model for 5G ProSe Layer-3 UE-to-Network Relay with N3IWF support
Figure 4.2.7.1-3Roaming architecture model for 5G ProSe Layer-3 UE-to-Network Relay with N3IWF support
Figure 4.2.7.1A-1Reference architecture for 5G ProSe multi-hop Layer-3 UE-to-Network Relay
Figure 4.2.7.2-15G ProSe Layer-2 UE-to-Network Relay reference architecture
Figure 4.2.8-1Reference architecture for 5G ProSe UE-to-UE Relay
Figure 4.2.8A-1Reference architecture for Layer-3 5G ProSe Multi-hop UE-to-UE Relay
Table 5.6.1-1Standardized PQI values that are additionally defined to QoS characteristics mapping
Figure 5.6.2.1-1End-to-End QoS translation for 5G ProSe Layer-3 UE-to-Network Relay operation
Figure 5.6.2.2-1End-to-End QoS support via Layer-3 UE-to-Network Relay with N3IWF
Figure 5.6.2.4-1End-to-End QoS translation for 5G ProSe Multi-hop Layer-3 UE-to-Network Relay operation
Figure 5.6.3.1-1End-to-End QoS for 5G ProSe Layer-3 UE-to-UE Relay operation
Figure 5.6.3.1-2End-to-End QoS for Multi-hop 5G ProSe Layer-3 UE-to-UE Relay for non-IP type PDU operation
Figure 5.16-1Example scenario of communication path switching between PC5 and Uu reference points (i.e. switching between Figure a and Figure b)
Figure 5.17.1-1Multi-path communication via Uu and via 5G ProSe UE-to-Network Relay
Figure 6.1.1.2.1-1Discovery Plane PC5 Interface
Figure 6.1.1.3-1Control Plane for PC3a Interface
Figure 6.1.1.7.1-1Control 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 6.1.1.7.1-2Control 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 6.1.1.7.2-1End-to-End Control Plane for a Remote UE using Layer-2 UE-to-Network Relay
Figure 6.1.1.8.1-1End-to-End Control Plane protocol stacks using a 5G ProSe Layer-2 UE-to-UE Relay
Figure 6.1.2.2-1User Plane for NR PC5 reference point
Figure 6.1.2.3.1-1User plane protocol stack for Layer-3 UE-to-Network Relay
Figure 6.1.2.3.1-2User plane protocol stacks for Layer-3 UE-to-Network Relay with N3IWF support
Figure 6.1.2.3.2-1End-to-End User Plane Stack for a 5G ProSe Remote UE using 5G ProSe Layer-2 UE-to-Network Relay
Figure 6.1.2.4.1-1End-to-End User Plane protocol stacks using a 5G ProSe Layer-2 UE-to-UE Relay
Figure 6.2.4-1UE triggered 5G ProSe Policy provisioning procedure
Figure 6.3.1.2-1Overall procedure for Model A 5G ProSe Direct Discovery
Figure 6.3.1.3-1Overall procedure for Model B 5G ProSe Direct Discovery
Figure 6.3.2.1-15G ProSe direct discovery with Model A
Figure 6.3.2.1-25G ProSe direct discovery with Model B
Figure 6.3.2.2.2-1Group Member Discovery with Model A
Figure 6.3.2.2.3-1Group Member Discovery with Model B
Figure 6.3.2.3.2-15G ProSe UE-to-Network Relay Discovery with Model A
Figure 6.3.2.3.3-15G ProSe UE-to-Network Relay Discovery with Model B
Figure 6.3.2.4.2-15G ProSe UE-to-UE Relay Discovery with Model A
Figure 6.3.2.4.3-15G ProSe UE-to-UE Relay Discovery with Model B
Figure 6.3.2.5.2-15G ProSe multi-hop UE-to-Network Relay discovery procedure with Model A
Figure 6.3.2.5.3-1General Procedures for 5G ProSe Multi-hop UE-to-Network Relay Discovery with Model B
Figure 6.3.2.5.4-1Procedure for additional parameters announcement for multi-hop UE-to-Network relaying
Figure 6.3.2.6.2-15G ProSe Multi-hop UE-to-UE Relay Discovery of IP PDU type with Model A
Figure 6.3.2.6.2-25G ProSe Multi-hop UE-to-UE Relay Discovery of IP PDU type with Model B
Figure 6.3.2.6.3.1-15G ProSe multi-hop UE-to-UE Relay Discovery of non-IP PDU type with Model A
Figure 6.3.2.6.3.2-1Multi-hop 5G ProSe UE-to-UE Relay Discovery of non-IP PDU type with Model B
Figure 6.4.1-1Procedure for Broadcast mode of 5G ProSe direct communication over PC5 reference point
Figure 6.4.2-1Procedure for groupcast mode 5G ProSe Direct communication
Figure 6.4.3.1-1Layer-2 link establishment procedure
Figure 6.4.3.2-1Link identifier update procedure
Figure 6.4.3.3-1Layer-2 link release procedure
Figure 6.4.3.4-1Layer-2 link modification procedure
Figure 6.4.3.5-1Layer-2 link maintenance procedure
Figure 6.4.3.8.3-1Relay reselection for 5G ProSe Remote UE with 5G ProSe Multi-hop UE-to-Network Relays without Root Relay change
Figure 6.4.3.8.3-2Relay reselection for 5G ProSe Remote UE with 5G ProSe Multi-hop UE-to-Network Relays with Root Relay change
Figure 6.5.1.1-15G ProSe Communication via 5G ProSe Layer-3 UE-to-Network Relay without N3IWF
Figure 6.5.1.2.1-1Connection establishment over 5G ProSe Layer-3 UE-to-Network Relay with N3IWF support
Figure 6.5.1.3-1Additional parameters announcement procedure
Figure 6.5.1.4-1Connection establishment via Multi-hop 5G ProSe Layer-3 UE-to-Network Relay without N3IWF support
Figure 6.5.1.5-15G ProSe Communication via Multi-hop 5G ProSe Layer-3 UE-to-Network Relay with N3IWF support
Figure 6.5.2.2-1Connection Establishment for 5G ProSe Layer-2 UE-to-Network Relay
Figure 6.7.1.1-1Layer-2 link establishment via 5G ProSe Layer-3 UE-to-UE Relay
Figure 6.7.1.2-1Link Identifier Update and IP address/prefix sharing via 5G ProSe Layer-3 UE-to-UE Relay
Figure 6.7.1.3-1Layer-2 Link Release procedure via 5G ProSe Layer-3 UE-to-UE Relay
Figure 6.7.1.4-1Layer-2 link modification procedure via Layer-3 UE-to-UE Relay
Figure 6.7.2-15G ProSe Communication via 5G ProSe Layer-2 UE-to-UE Relay
Figure 6.7.3.2-15G ProSe UE-to-UE Relay Communication with integrated Discovery via Layer-3 UE-to-UE Relay
Figure 6.7.3.3-15G ProSe UE-to-UE Relay Communication with integrated Discovery via Layer-2 UE-to-UE Relay
Figure 6.7.4.2-1Negotiated 5G ProSe Layer-2 UE-to-UE Relay reselection
Figure 6.7.4.3-1Negotiated 5G ProSe Layer-3 UE-to-UE Relay reselection
Figure 6.7.4.4-1Negotiated multihop Layer-3 UE-to-UE Relay reselection procedure.
Figure 6.7.5.2.1-15G ProSe Communication via IP type of 5G ProSe Multi-hop UE-to-UE Relay
Figure 6.7.5.2.2-1Layer-2 link establishment via 5G ProSe Layer-3 UE-to-UE Relay for Non-IP Type PDU
Figure 6.8.1-1Procedure for communication path switching from Uu reference point to PC5 reference point
Figure 6.8.2-1Procedure for communication path switching from PC5 reference point to Uu reference point
Table 7.1.1-1Services provided by 5G DDNMF
Table 7.2.1-1Services provided by AF

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