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Content for  TS 23.304  Word version:  19.1.0

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5.6 QoS handling  5.6.1 QoS handling for 5G ProSe Direct Communication  5.6.2 QoS handling for 5G ProSe UE-to-Network Relay operations  5.6.2.1 QoS handling for 5G ProSe Layer-3 UE-to-Network Relay without N3IWF  5.6.2.2 QoS handling for 5G ProSe Layer-3 UE-to-Network relay with N3IWF  5.6.2.3 QoS handling for 5G ProSe Layer-2 UE-to-Network Relay  5.6.3 QoS handling for 5G ProSe UE-to-UE Relay operations  5.6.3.1 QoS handling for 5G ProSe Layer-3 UE-to-UE Relay  5.6.3.2 QoS handling for 5G ProSe Layer-2 UE-to-UE Relay 
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5.6  QoS handling  p. 62

5.6.1  QoS handling for 5G ProSe Direct Communication  p. 62

In order to support QoS handling for 5G ProSe Direct Communication, the mechanism defined in clause 5.4 of TS 23.287 is reused with the following differences:
  • Only NR PC5 QoS model is used.
  • PC5 Packet Filter Set supports three types of packet filters, i.e. the Prose IP Packet Filter Set, ProSe Ethernet Packet Filter Set and the Prose Packet Filter Set. Each PC5 QoS Rule additionally contains the ProSe identifier when the ProSe identifier is not included in the PC5 Packet Filter Set.
  • V2X IP Packet Filter Set is replaced by ProSe IP Packet Filter Set.
  • V2X Packet Filter Set is replaced by ProSe Packet Filter Set. ProSe Packet Filter Set shall support Packet Filters based on at least any combination of:
    • ProSe identifier;
    • Source/Destination Layer-2 ID;
    • Application Layer ID.
  • ProSe Ethernet Packet Filter Set that has the same format as the Ethernet Packet Filter Set defined in clause 5.7.6.3 of TS 23.501 is additionally defined.
  • V2X application layer is replaced by ProSe application layer.
  • V2X layer is replaced by ProSe layer.
  • V2X service type is replaced by ProSe identifier.
  • UE-PC5-AMBR is only applied for NR PC5.
  • The PQI values are additionally defined. The one-to-one mapping of standardized PQI values that are additionally defined to PC5 QoS characteristics is specified in Table 5.6.1-1.
PQI Value Resource Type Default Priority Level Packet Delay Budget Packet Error Rate Default Maximum Data Burst Volume Default Averaging Window Example Services
24GBR
(NOTE 1)		1150 ms10-2N/A2000 msMission Critical user plane Push To Talk voice (e.g. MCPTT)
252200 ms10-2N/A2000 msNon-Mission-Critical user plane Push To Talk voice, Conversational Voice
262200 ms10-3N/A2000 msMission Critical Video user plane
324300 ms10-3N/A2000 msConversational Video (Live Streaming)
333100 ms10-3N/A2000 msReal Time Gaming, Process automation monitoring
345600 ms10-6N/A2000 msNon-Conversational Video (Buffered Streaming)
60Non-GBR1120 ms10-6N/AN/AMission Critical delay sensitive signalling (e.g. MC-PTT signalling)
616400 ms10-6N/AN/AMission Critical Data (e.g. example services are the same as 5QI 6/8/9 as specified in TS 23.501)
707200 ms10-3N/AN/AVoice, Video (Live Streaming), Interactive Gaming
71720 ms10-6N/AN/ALow Latency eMBB applications Augmented Reality
92Delay Critical GBR
(NOTE 1)		55ms10-420000 bytes2000 msInteractive service - consume VR content with high compression rate via tethered VR headset (See TS 22.261)
93610ms10-420000 bytes2000 msinteractive service - consume VR content with low compression rate via tethered VR headset;
Gaming or Interactive Data Exchanging (See TS 22.261)
NOTE:
GBR and Delay Critical GBR PQIs can only be used for unicast PC5 communications.
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5.6.2  QoS handling for 5G ProSe UE-to-Network Relay operations  p. 63

5.6.2.1  QoS handling for 5G ProSe Layer-3 UE-to-Network Relay without N3IWF  p. 63

For a 5G ProSe Layer-3 Remote UE accessing network via 5G ProSe Layer-3 UE-to-Network Relay without N3IWF, the QoS requirement of the relay traffic between 5G ProSe Layer-3 Remote UE and UPF can be satisfied by the corresponding QoS control for the PC5 link between 5G ProSe Layer-3 Remote UE and 5G ProSe Layer-3 UE-to-Network Relay (PC5 QoS control) and the QoS control for the PDU session established between 5G ProSe Layer-3 UE-to-Network Relay and UPF (i.e. Uu QoS control). The PC5 QoS is controlled with PC5 QoS rules and PC5 QoS parameters (e.g. PQI, GFBR, MFBR, PC5 LINK-AMBR) as specified in clause 5.4 of TS 23.287. The QoS for the PDU session established between the 5G ProSe Layer-3 UE-to-Network Relay and UPF (i.e. Uu QoS control) is controlled with QoS rules and 5G QoS parameters (e.g. 5QI, GFBR, MFBR) as specified in clause 5.7 of TS 23.501.
As shown in Figure 5.6.2.1-1 below, the end-to-end QoS can be met only when the QoS requirements are properly translated and satisfied over the two legs respectively.
Copy of original 3GPP image for 3GPP TS 23.304, Fig. 5.6.2.1-1: End-to-End QoS translation for 5G ProSe Layer-3 UE-to-Network Relay operation
Figure 5.6.2.1-1: End-to-End QoS translation for 5G ProSe Layer-3 UE-to-Network Relay operation
(⇒ copy of original 3GPP image)
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To achieve this, the QoS mapping can be pre-configured or provided to the 5G ProSe Layer-3 UE-to-Network Relay by the PCF using Prose Policy as specified in clause 5.1.4.1. The QoS mapping includes combinations of the 5QIs and PQIs mapping as entries. The PQI shall have standardized values as defined in Table 5.6.1-1 and in Table 5.4.4-1 of TS 23.287. The 5QI shall have standardized values as defined in clause 5.7.4 of TS 23.501. The QoS mapping also includes an adjustment factor for the PQI's PDB, e.g. 1/5 of the standardized PDB value in Table 5.6.1-1 and Table 5.4.4-1 of TS 23.287.
If the QoS Flows setup are initiated by network, the SMF can base on the PCC rules or its local configuration to generates the QoS rules and QoS Flow level QoS parameters (e.g. 5QI, GFBR, MFBR) and signal to the 5G ProSe Layer-3 UE-to-Network Relay using PDU Session Establishment/Modification procedure. For the PDU sessions used for relaying, the SMF always provides the QoS Flow level QoS parameters to the 5G ProSe Layer-3 UE-to-Network Relay when establishes a QoS Flow. Then the 5G ProSe Layer-3 UE-to-Network Relay decides the PC5 QoS parameters for the corresponding PC5 QoS Flow by determining the PQI based the QoS mapping and the GFBR and MFBR values for the PC5 GBR QoS Flow are set equal to the GFBR and MFBR values for the GBR QoS Flow respectively. The PCF differentiates the relay traffic based on either local configuration, e.g.by a dedicated DNN or S-NSSAI used for relay traffic or by the traffic filters.
If the 5G ProSe Layer-3 Remote UE initiates PC5 QoS Flows setup or modification during the Layer-2 link establishment or modification procedure, the 5G ProSe Layer-3 Remote UE provides the QoS Info as described in clause 6.4.3.6 to the 5G ProSe Layer-3 UE-to-Network Relay. The received PC5 QoS parameters of the QoS Info (i.e. PQI and conditionally other parameters such as MFBR/GFBR, etc.) are interpreted as the end-to-end QoS requirements by the 5G ProSe Layer-3 UE-to-Network Relay for the traffic transmission between 5G ProSe Layer-3 Remote UE and UPF. If the end-to-end QoS requirements can be supported by an entry in QoS mapping, the 5G ProSe Layer-3 UE-to-Network Relay uses the 5QI of the entry for the Uu QoS control and uses the PQI of the entry for the PC5 QoS control. If the end-to-end QoS requirements cannot be supported by any entries in QoS mapping, the 5G ProSe Layer-3 UE-to-Network Relay, based on its implementation, decides the 5QI for the Uu QoS control and PQI for the PC5 QoS control. The 5G ProSe Layer-3 UE-to-Network Relay provides the QoS Info (including PQI value chosen by the 5G ProSe Layer-3 UE-to-Network Relay) as part of the Accept message to the 5G ProSe Layer-3 Remote UE. If the 5G ProSe Layer-3 Remote UE performs the Layer-2 link modification procedure to add new PC5 QoS Flow(s) or modify the existing PC5 QoS Flow(s) for IP traffic or Ethernet traffic over PC5 reference point, the 5G ProSe Layer-3 Remote UE may also provide the PC5 QoS Rule(s) for the PC5 QoS Flow(s) to be added or modified to the 5G ProSe Layer-3 UE-to-Network Relay. The 5G ProSe Layer-3 UE-to-Network Relay may generate the Packet Filters used over Uu reference point based on the received PC5 QoS Rule(s).
The 5G ProSe Layer-3 UE-to-Network Relay performs the UE requested PDU session Modification as defined in clause 4.3.3 of TS 23.502 for authorizing the requested QoS including the 5QI and the Packet Filters. If the PCF authorizes the requested QoS with a different 5QI value, the 5G ProSe Layer-3 UE-to-Network Relay may further update the PQI value based on the authorized 5QI value and the 5G ProSe Layer-3 UE-to-Network Relay performs the Layer-2 link modification procedure as defined in clause 6.4.3.6 to update the corresponding PC5 QoS Flow with the updated PQI value.
Alternatively, reflective QoS control over Uu as defined in clause 5.7.5.3 of TS 23.501, can be leveraged for dynamic QoS handling of 5G ProSe Layer-3 Remote UE to save on signalling between SMF and 5G ProSe Layer-3 UE-to-Network Relay. Upon reception of a DL packet with RQI on the Uu for the 5G ProSe Layer-3 Remote UE, based on the indicated QFI, the 5G ProSe Layer-3 UE-to-Network Relay creates a new derived QoS rule or updates existing derived QoS rule corresponding to the remote UE, as defined in TS 23.501. The derived QoS rule is for UL packets from the 5G ProSe Layer-3 Remote UE at Uu interface.
Based on signalled QoS rules (via SMF) or derived QoS rules (Uplink Uu via reflective QoS), the 5G ProSe Layer-3 UE-to-Network Relay may generate the Packet Filters used over PC5 reference point and use the L2 Link Modification procedures as defined in clause 6.4.3.6 to either update existing PC5 QoS Flow(s) or to set up new PC5 QoS Flow(s) (when the QFI to PC5 QoS Flow mapping does not exist). The 5G ProSe Layer-3 UE-to-Network Relay may also provide the PC5 QoS Rule(s) for the PC5 QoS Flow(s) to be added or modified to the 5G ProSe Layer-3 Remote UE.
When the 5G ProSe Layer-3 UE-to-Network relay deletes the derived QoS rule e.g. after the RQ Timer expires, the 5G ProSe Layer-3 UE-to-Network Relay may perform L2 Link Modification procedures defined in clause 6.4.3.6 accordingly using the PQI mapped from the 5QI of the currently used QoS rule after the deletion of the derived QoS rule(s).
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5.6.2.2  QoS handling for 5G ProSe Layer-3 UE-to-Network relay with N3IWF  p. 65

When accessing 5GS via a 5G ProSe Layer-3 UE-to-Network Relay with N3IWF, the 5G ProSe Layer-3 Remote UE can request for PDU Session establishment or handover an existing PDU session to the N3IWF using UE requested PDU Session Establishment procedure defined in clause 4.12.5 of TS 23.502.
Copy of original 3GPP image for 3GPP TS 23.304, Fig. 5.6.2.2-1: End-to-End QoS support via Layer-3 UE-to-Network Relay with N3IWF
Figure 5.6.2.2-1: End-to-End QoS support via Layer-3 UE-to-Network Relay with N3IWF
(⇒ copy of original 3GPP image)
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For the 5G ProSe Layer-3 Remote UE's PDU session(s) established via N3IWF, QoS differentiation can be provided on per-IPsec Child Security Association basis. N3IWF determines the IPsec child SAs as defined in clause 4.12 of TS 23.502. The N3IWF is preconfigured to allocate different IPsec child SAs for QoS Flows with different QoS profiles.
Based on configuration, the N3IWF can use one of the options below for QoS support in 5G ProSe Layer-3 UE-to-Network Relay UE's serving PLMN:
  • a static QoS mapping mechanism;
  • a dynamic QoS signalling based mechanism.
For the static QoS mapping mechanism, a SLA is established to govern the QoS handling between the 5G ProSe Layer-3 Remote UE's 5GC and the 5G ProSe Layer-3 UE-to-Network Relay UE's 5GC, e.g. when the RSC is configured. The SLA can include the mapping between the DSCP markings for the IPsec child SAs with the Remote UE and the corresponding QoS and N3IWF IP address(es). The non-alteration of the DSCP field between N3IWF and the 5G ProSe Layer-3 UE-to-Network Relay UE's UPF is also assumed to be governed by an SLA and by transport-level arrangements that are outside of 3GPP scope. The packet detection filters at the 5G ProSe Layer-3 UE-to-Network Relay UE's UPF can be based on the N3IWF IP address and the DSCP markings.
When the dynamic QoS signalling based mechanism is used by N3IWF, it works as follows:
  • When the 5G ProSe Layer-3 Remote UE establishes or handovers a PDU session via the N3IWF as described in clause 4.12.5 of TS 23.502, the PCF serving the PDU Session in the 5G ProSe Layer-3 Remote UE's 5GC detects need for specific QoS and provides corresponding PCC rules to SMF in the 5G ProSe Layer-3 Remote UE's 5GC. The resulted QoS information is provided to N3IWF in step 2b of clause 4.12.5 of TS 23.502. The N3IWF determines the IPSec Child SA(s) and signals to the 5G ProSe Layer-3 Remote UE, as in step 4 of clause 4.12.5 of TS 23.502 via IKE signalling including the PDU Session ID, the QFI(s), optionally a DSCP value and optionally the Additional QoS Information specified in clause 4.12.5 of TS 23.502. The PDU Session Establishment Accept message will be sent to the 5G ProSe Layer-3 Remote UE as in step 5 of clause 4.12.5 of TS 23.502.
  • Based on Additional QoS Information received from the N3IWF, the 5G ProSe Layer-3 Remote UE determines whether it is necessary to request for QoS session modification for the dedicated QoS Flows toward the 5G ProSe Layer-3 UE-to-Network Relay as described in clause 5.6.2.1. The 5G ProSe Layer-3 Remote UE also provides the N3IWF address, DSCP and the SPI as the traffic filter to enable filtering and mapping of DL traffic towards the right PDU Session/QoS Flow within the 5G ProSe Layer-3 UE-to-Network Relay UE's 5GC.
  • If the 5G ProSe Layer-3 UE-to-Network Relay performs the PDU Session Modification procedure, the PCF in the 5G ProSe Layer-3 UE-to-Network Relay UE's 5GC authorizes the QoS parameters. If the PDU Session Modification procedure authorized the requested QoS parameters, the 5G ProSe Layer-3 UE-to-Network Relay acknowledges the 5G ProSe Layer-3 Remote UE over PC5. The 5G ProSe Layer-3 UE-to-Network Relay also provides the traffic filter provided by the 5G ProSe Layer-3 Remote UE to the SMF during the PDU Session Modification procedure and the SMF updates the PSA UPF with DL Packet Detection Rules.
  • The PSA UPF in the 5G ProSe Layer-3 UE-to-Network Relay UE's 5GC maps the DL traffic from IPSec Child SA tunnel to appropriate PDU Session/QoS Flow considering SPI and N3IWF address (filters provided by the 5G ProSe Layer-3 Remote UE).
  • The 5G ProSe Layer-3 Remote UE's or the 5G ProSe Layer-3 Remote UE's 5GC may initiated PDU Session Modification procedures as specified in clause 4.12.6 of TS 23.502. When the 5G ProSe Layer-3 Remote UE received QoS information from the N3IWF, the same interactions between the 5G ProSe Layer-3 Remote UE and 5G ProSe Layer-3 UE-to-Network Relay and between the 5G ProSe Layer-3 UE-to-Network Relay and its 5GC as described above apply.
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5.6.2.3  QoS handling for 5G ProSe Layer-2 UE-to-Network Relay  p. 66

For a 5G ProSe Layer-2 Remote UE accessing network via 5G ProSe Layer-2 UE-to-Network Relay, the existing 5G QoS control is reused between the 5G ProSe Layer-2 Remote UE and the 5G ProSe Layer-2 Remote UE's core network. The 5G ProSe Layer-2 Remote UE's SMF provides QoS profiles to NG-RAN, how NG-RAN performs QoS enforcement for PC5 interface (between the 5G ProSe Layer-2 Remote UE and 5G ProSe Layer-2 UE-to-Network Relay) and Uu interface (between the 5G ProSe Layer-2 UE-to-Network Relay and RAN) is specified in TS 38.300.
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5.6.3  QoS handling for 5G ProSe UE-to-UE Relay operations |R18|  p. 66

5.6.3.1  QoS handling for 5G ProSe Layer-3 UE-to-UE Relay  p. 66

For a 5G ProSe Layer-3 End UE connecting with another 5G ProSe Layer-3 End UE(s) via 5G ProSe Layer-3 UE-to-UE Relay, the QoS requirement of the relay traffic between the peer 5G ProSe Layer-3 End UE(s) can be satisfied by the corresponding QoS control for the PC5 link between source 5G ProSe Layer-3 End UE and 5G ProSe Layer-3 UE-to-UE Relay (i.e. first hop PC5 QoS control) and the QoS control for the PC5 link between 5G ProSe Layer-3 UE-to-UE Relay and target 5G ProSe Layer-3 End UE (i.e. second hop PC5 QoS control). The first hop PC5 QoS and second hop PC5 QoS is controlled with PC5 QoS rules and PC5 QoS parameters (e.g. PQI, GFBR, MFBR, PC5 LINK-AMBR) as specified in clause 5.6.1.
As shown in Figure 5.6.3.1-1 below, the end-to-end QoS is met only when the QoS requirements are properly translated and satisfied over the two legs respectively.
Copy of original 3GPP image for 3GPP TS 23.304, Fig. 5.6.3.1-1: End-to-End QoS for 5G ProSe Layer-3 UE-to-UE Relay operation
Figure 5.6.3.1-1: End-to-End QoS for 5G ProSe Layer-3 UE-to-UE Relay operation
(⇒ copy of original 3GPP image)
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To achieve this, the source 5G ProSe Layer-3 End UE initiates PC5 QoS Flows setup or modification during the Layer-2 link establishment or modification procedure, the source 5G ProSe Layer-3 End UE provides the QoS Info as described in clause 6.4.3.7.3 to the 5G ProSe Layer-3 UE-to-UE Relay. The received PC5 QoS parameters of the QoS Info (i.e. PQI and conditionally other parameters such as MFBR/GFBR, etc.) are interpreted as the end-to-end QoS requirements by the 5G ProSe Layer-3 UE-to-UE Relay for the traffic transmission between source 5G ProSe Layer-3 End UE and target 5G ProSe Layer-3 End UE. The source 5G ProSe Layer-3 End UE derives the end-to-end QoS parameters as defined in clause 5.6.1. The 5G ProSe Layer-3 UE-to-UE Relay, based on its implementation, decides the PQI for the first hop PC5 QoS control and the PQI for the second hop PC5 QoS control, by considering the received PC5 QoS parameters from the source 5G ProSe Layer-3 End UE. The 5G ProSe Layer-3 UE-to-UE Relay provides the QoS Info (including PQI value chosen by the 5G ProSe Layer-3 UE-to-UE Relay for the second hop) to the target 5G ProSe Layer-3 End UE. After accepted QoS Info of the second hop QoS from the target 5G ProSe Layer-3 End UE is received, 5G ProSe Layer-3 UE-to-UE Relay provides the QoS Info (including PQI value chosen by the 5G ProSe Layer-3 UE-to-UE Relay for the first hop) to the source 5G ProSe Layer-3 End UE with considering the received second hop QoS. If the source 5G ProSe Layer-3 End UE performs the Layer-2 link modification procedure to add new PC5 QoS Flow(s) or modify the existing PC5 QoS Flow(s) for IP traffic or Ethernet traffic over PC5 reference point, the source 5G ProSe Layer-3 End UE may also provide the PC5 QoS Rule(s) for the PC5 QoS Flow(s) to be added or modified to the 5G ProSe Layer-3 UE-to-UE Relay. The 5G ProSe Layer-3 UE-to-UE Relay may generate the Packet Filters used over the second hop based on the received PC5 QoS Rule(s).
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5.6.3.2  QoS handling for 5G ProSe Layer-2 UE-to-UE Relay  p. 67

For a 5G ProSe Layer-2 End UE connecting with another 5G ProSe Layer-2 End UE(s) via 5G ProSe Layer-2 UE-to-UE Relay, the source 5G ProSe Layer-2 End UE and the target 5G ProSe Layer-2 End UE negotiate the end-to-end QoS for the traffic transmission between source 5G ProSe Layer-2 End UE and target 5G ProSe Layer-2 End UE. The QoS enforcement for first hop PC5 interface (between the source 5G ProSe Layer-2 End UE and 5G ProSe Layer-2 UE-to-UE Relay) and second hop PC5 interface (between the 5G ProSe Layer-2 UE-to-UE Relay and the target 5G ProSe Layer-2 End UE) is specified in TS 38.300.
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