8.2.58 CP Function Features

29.2443GPPInterface between the Control Plane and the User Plane nodesRelease 17TS

The CP Function Features IE indicates the features supported by the CP function. Only features having an impact on the (system-wide) UP function behaviour are signalled in this IE. It is coded as depicted in Figure 8.2.58-1.

Bits

Octets

8

7

6

5

4

3

2

1

1 to 2

Type = 89 (decimal)

3 to 4

Length = n

5

Supported-Features

6 to 7

Additional Supported-Features 1

8 to (n+4)

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

Figure 8.2.58-1: CP Function Features

The CP Function Features IE takes the form of a bitmask where each bit set indicates that the corresponding feature is supported. Spare bits shall be ignored by the receiver. The same bitmask is defined for all PFCP interfaces.

The following table specifies the features defined on PFCP interfaces and the interfaces on which they apply.

Table 8.2.58-1: CP Function Features

Feature Octet / Bit

Feature

Interface

M/O

Description

5/1

LOAD

Sxa, Sxb, Sxc, N4, N4mb

O

Load Control is supported by the CP function.

5/2

OVRL

Sxa, Sxb, Sxc, N4, N4mb

O

Overload Control is supported by the CP function.

5/3

EPFAR

Sxa, Sxb, Sxc, N4

O

The CP function supports the Enhanced PFCP Association Release feature (see clause 5.18).

5/4

SSET

N4, N4mb

O

(MB-)SMF support of PFCP sessions successively controlled by different (MB-)SMFs of a same (MB-)SMF Set (see clause 5.22).

5/5

BUNDL

Sxa, Sxb, Sxc, N4, N4mb

O

PFCP messages bundling (see clause 6.5) is supported by the CP function.

5/6

MPAS

N4, N4mb

O

(MB-)SMF support for multiple PFCP associations from an (MB-)SMF set to a single (MB-)UPF (see clause 5.22.3).

5/7

ARDR

Sxb, N4

O

CP function supports Additional Usage Reports in the PFCP Session Deletion Response (see clause 5.2.2.3.1).

5/8

UIAUR

Sxb, N4

O

CP function supports the UE IP Address Usage Reporting feature, i.e. receiving and handling of UE IP Address Usage Information IE (see clause 5.21.3.2).

6/1

PSUCC

Sxb, Sxc, N4, N4mb

O

CP function supports PFCP session establishment or modification with Partial Success, i.e. with UP function reporting rules that cannot be activated.

See clause 5.2.9.

6/2

RPGUR

Sxa, Sxb, N4, N4mb

O

CP function supports the Peer GTP-U Entity Restart Reporting as specified in clause 20.3.4a of 3GPP TS 23.007 [24] and in clause 5.5 of 3GPP TS 23.527 [40].

NOTE: Features are defined as follows:

– Feature Octet / Bit: The octet and bit number within the Supported-Features IE, e.g. "5 / 1".

– Feature: A short name that can be used to refer to the octet / bit and to the feature.

– Interface: A list of applicable interfaces to the feature.

– M/O: Defines if the implementation of the feature is mandatory ("M") or optional ("O") for a CP function complying with this release of the specification.
A feature defined as mandatory in this release of the specification may not necessarily be defined or mandatory to support in earlier releases (see the respective specifications), therefore a UP function complying with this release of the specification shall be prepared to receive a CP Function Features IE with a mandatory feature bit set to "0".

– Description: A clear textual description of the feature.