3GPP 24.501 v20.0.0 — the document's own text
6.2.16 Handling of header compression for control plane CIoT optimizations
Taught in 4. Inside TS 24.501, the document at the centre (CT1 — the group that writes what your phone says, overview).
The UE and the SMF may use:
- IP header compression for PDU sessions of "IPv4", "IPv6" or "IPv4v6" PDU session type; and
- Ethernet header compression for PDU sessions of "Ethernet" PDU session type.
Both the UE and the AMF indicate whether header compression for control plane CIoT 5GS optimization is supported during registration procedures (see clause 5.5.1). If both the UE and the network support header compression, the header compression configuration for each PDU session is negotiated during the PDU session establishment procedure and PDU session modification procedure as specified in clauses 6.3.2, 6.4.1 and 6.4.2.
For IP header compression, ROHC protocol specified in IETF RFC 5795 [39B] is used. The IP header compression configuration used for IP header compression is (re-)negotiated between the UE and the SMF using the IP header compression configuration IE as specified in clauses 6.3.2.2, 6.4.1.2, 6.4.1.3 and 6.4.2.2, respectively.
For Ethernet header compression, Ethernet Header Compression (EHC) protocol specified in 3GPP TS 38.323 [29] is used. The Ethernet header compression configuration used for Ethernet header compression is (re-)negotiated between the UE and the SMF using the Ethernet header compression configuration IE as specified in clauses 6.3.2.2, 6.4.1.2, 6.4.1.3 and 6.4.2.2, respectively.