Octets

8

7

6

5

4

3

2

1

1 to 2

Type = 95 (decimal)

3 to 4

Length = n

5

Outer Header Removal Description

6

GTP-U Extension Header Deletion

7 to (n+4)

These octet(s) is/are present only if explicitly specified

GTP-U/UDP/IPv4 (NOTE 1), (NOTE 2), (NOTE 8)

0

GTP-U/UDP/IPv6 (NOTE 1), (NOTE 2)

1

UDP/IPv4 (NOTE 3, NOTE 6)

2

UDP/IPv6 (NOTE 3, NOTE 6)

3

IPv4 (NOTE 6)

4

IPv6 (NOTE 6)

5

GTP-U/UDP/IP (NOTE 4)

6

VLAN TAG POP (i.e. removal of one VLAN tag, S-TAG or C-TAG) (See NOTE 5)

7

VLAN TAGs POP-POP (i.e. removal of 2 VLAN tags, S-TAG and C-TAG) (See NOTE 5)

8

Spare, for future use. (See NOTE 7)

9 to 255

NOTE 1: The SGW-U/I-UPF shall store GTP-U extension header(s) required to be forwarded for this packet (as required by the comprehension rules of Figure 5.2.1-2 of 3GPP TS 29.281 [3]) that are not requested to be deleted by the GTP-U Extension Header Deletion field.

NOTE 2: The SGW-U/I-UPF shall store the GTP-U message type for a GTP-U signalling message which is required to be forwarded, e.g. for an End Marker message.

NOTE 3: This value may apply to DL packets received by a PGW-U for non-IP PDN connections with SGi tunnelling based on UDP/IP encapsulation (see clause 4.3.17.8.3.3.2 of 3GPP TS 23.401 [14]).

NOTE 4: The CP function shall use this value to instruct UP function to remove the GTP-U/UDP/IP header regardless it is IPv4 or IPv6.

NOTE 5: This value may apply to DL packets received by a UPF over N6 for Ethernet PDU sessions (see clause 5.8.2.11.3 of 3GPP TS 23.501 [28]). The VLAN POP operation removes the VLAN tag from the top of the VLAN stack (outer VLAN tag), i.e. it removes the S-TAG or C-TAG if the user plane packet contains only one VLAN tag, or it removes the S-TAG if the user plane packet contains both a C-TAG and an S-TAG.

NOTE 6: This value may apply e.g. to DL packets received by a UPF (PDU Session Anchor) over N6, when explicit N6 traffic routing information is provided to the SMF (see clause 5.6.7 of 3GPP TS 23.501 [28]).

NOTE 7: If the UP function receives an unknown value, it shall reject the request message with the cause set to "Mandatory IE incorrect" together with the Offending IE set to the IE type of Outer Header Removal IE.

NOTE 8: The PSA UPF shall store GTP-U extension header(s) required to be forwarded and that are not requested to be deleted by the GTP-U Extension Header Deletion field, e.g. the PDU Session Container received from the MB-UPF (for MBS session data) over N19mb interface, and modify it as instructed by the SMF, e.g. the PSA UPF may be instructed to modify the QFI field in the PDU Session Container extension header for the packets received from the MB-UPF.

6/1

PDU Session Container (NOTE)

NOTE: This value shall be used for data forwarding during a 5GS to EPS handover for a UPF that supports EPS-5GS interworking (see clause 5.17.3).