Content for TS 23.316 Word version: 19.0.0
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5 Network Function p. 35
5.0 General p. 35
This clause specifies the definition network function specific for W-AGF and the delta to network function defined in TS 23.501.
5.1 Network Function Functional description p. 35
5.1.1 W-AGF p. 35
The functionality of W-AGF in the case of Wireline 5G Access network includes the following:
- Termination of N2 and N3 interfaces to 5G Core Network for control - plane and user-plane respectively.
- Handling of N2 signalling from SMF (relayed by AMF) related to PDU Sessions and QoS.
- Support of ECN marking for L4S: The SMF provides ECN marking request per QoS flow level to the W-AGF as part of PDU session management procedures.
- When ECN marking for L4S at W-AGF is enabled for downlink or uplink, the W-AGF applies the mapping between L4S-enabled QoS profile(s) and L4S-enabled W-UP resource(s) and the W-AGF should set the Congestion Experienced (CE) codepoint in downlink or uplink as per RFC 9330, RFC 9331, RFC 9332, RFC 6040 and RFC 9599.
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Relaying uplink and downlink user-plane packets between the 5G-RG and UPF and between FN-RG and UPF. This involves:
- Enforcing QoS corresponding to N3 packet marking, taking into account QoS requirements associated to such marking received over N2.
- N3 user-plane packet marking in the uplink.
- Supporting AMF discovery and selection defined in clause 6.3.5 of TS 23.501 where the 5G-S-TMSI is not used for AMF selection since the wireline AS layer can only carry the GUAMI.
- Termination of wireline access protocol on Y4 and Y5.
- In the case of FN-RG the W-AGF acts as end point of N1 on behalf of the FN-RG.
- Support PDU Set Handling as defined in clause 4.17.3 and in clause 5.37.5 of TS 23.501.
