Sxa

Sxb

Sxc

N4

N4mb

Cause

M

This IE shall indicate the acceptance or the rejection of the corresponding request message.

X

X

X

X

X

Cause

Offending IE

C

This IE shall be included if the rejection is due to a conditional or mandatory IE missing or faulty.

X

X

X

X

X

Offending IE

Update BAR

C

This IE shall be present if a BAR previously created for the PFCP session needs to be modified.

A previously created BAR that is not modified shall not be included.

See Table 7.5.9.2-1.

X

–

–

X

–

Update BAR

PFCPSRRsp-Flags

C

This IE shall be included if at least one of the flags is set to "1".

– DROBU (Drop Buffered Packets): the CP function shall set this flag if the UP function needs to drop the packets currently buffered for this PFCP session (see NOTE 1).

X

–

–

X

–

PFCPSRRsp-Flags

CP F-SEID

O

This IE may be set by the SMF if the UPF indicated support of PFCP sessions successively controlled by different SMFs of a same SMF Set and the Cause IE indicates "Request accepted (success)"(see clause 5.22).

When present, it shall be set to the new F-SEID that the UPF shall use for sending subsequent PFCP session related messages.

–

–

–

X

X

F-SEID

N4-u F-TEID

O

This IE may be set by the SMF if the UPF indicated support of PFCP sessions successively controlled by different SMFs of a same SMF Set and the Cause IE indicates "Request accepted (success)".

When present, it shall be set to the new N4-u F-TEID that the UPF shall use for data forwarding towards the SMF.

–

–

–

X

–

F-TEID

Alternative SMF IP Address

O

This IE may be set by the SMF if the UPF indicated support of PFCP sessions successively controlled by different SMFs of a same SMF Set and the Cause IE indicates "Redirection Requested" (see clause 5.22).

When present, it shall be set to the IP address of the new SMF to contact.

–

–

–

X

X

Alternative SMF IP Address

PGW-C/SMF FQ-CSID

O

This IE may be included by the alternative SMF or PGW-C to allocate a new PGW-C/SMF FQ-CSID for the PFCP session, during the restoration of PFCP sessions associated with one or more PGW-C/SMF FQ-CSID(s) (see clause 5.22.4), if the Cause IE indicates "Request accepted (success)".

When present, the UP function shall replace any earlier value associated to the PFCP session with the new value.

–

X

–

X

–

FQ-CSID

Group Id

C

This IE may be included by the alternative SMF or PGW-C to allocate a new Group Id for the PFCP session, during the restoration of PFCP sessions associated with one or more Group Id(s) (see clause 5.22.4), if the Cause IE indicates "Request accepted (success)".

When present, the UP function shall replace any earlier value associated to the PFCP session with the new value.

–

X

–

X

–

Group Id

Node ID

C

This IE should be present if the CP F-SEID IE is present.

When present, it shall be set to the Node ID of the SMF that has taken over the control of the PFCP session, i.e. that SMF has assigned the CP F-SEID.

–

–

–

X

–

Node ID

NOTE 1: The CP function may request the UP function to drop the packets currently buffered for the PFCP session, when buffering is performed in the UP function, upon receipt of a PFCP Session Report Request notifying the CP function about the arrival of downlink data packets for which the CP function decides to throttle the corresponding Downlink Data Notification message over S11/S4 and. See clause 5.9.3 of 3GPP TS 23.214 [2].

Octets 3 and 4

Length = n

Information elements

P

Condition / Comment

Appl.

IE Type

Sxa

Sxb

Sxc

N4

N4mb

BAR ID

M

This IE shall identify the BAR Rule to be modified.

X

–

–

X

–

BAR ID

Downlink Data Notification Delay

C

This IE shall be present if the UP function indicated support of the Downlink Data Notification Delay parameter (see clause 8.2.25) and the Downlink Data Notification Delay needs to be modified.

When present, it shall contain the delay the UP function shall apply between receiving a downlink data packet and notifying the CP function about it, when the Apply Action parameter requests to buffer the packets and notify the CP function.

X

–

–

X

–

Downlink Data Notification Delay

DL Buffering Duration

C

This IE shall be present if the UP function indicated support of the DL Buffering Duration parameter (see clause 8.2.25) and extended buffering of downlink data packet is required in the UP function.

When present, this IE shall indicate the duration during which the UP function shall buffer the downlink data packets without sending any further notification to the CP function about the arrival of DL data packets.

X

–

–

X

–

DL Buffering Duration

DL Buffering Suggested Packet Count

O

This IE may be present if extended buffering of downlink data packet is required in the UP function.

When present, this IE shall indicate the maximum number of downlink data packets suggested to be buffered in the UP function.

X

–

–

X

–

DL Buffering Suggested Packet Count

Suggested Buffering Packets Count

C

This IE may be present if the UP Function indicated support of the feature UDBC.

When present, it shall contain the number of packets that are suggested to be buffered when the Apply Action parameter requests to buffer the packets. The packets that exceed the limit shall be discarded.

–

X

X

X

–

Suggested Buffering Packets Count

NOTE 1: If the Apply Action requests the UP function to buffer and notify the CP function and the DL Buffering Duration is set, the UP function shall not notify the CP function for the duration indicated by the DL Buffering Duration.