9.1.4 Messages for IAB Procedures

38.4233GPPNG-RANRelease 17TSXn Application Protocol (XnAP)

9.1.4.1 F1-C TRAFFIC TRANSFER

This message is sent by the M-NG-RAN node to the S-NG-RAN node or by the S-NG-RAN node to the M-NG-RAN node of a dual-connected IAB-node to transfer the F1-C traffic to and from the IAB-node.

Direction: M-NG-RAN node  S-NG-RAN node or S-NG-RAN node  M-NG-RAN node.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.3.1

YES

reject

M-NG-RAN node UE XnAP ID

M

NG-RAN node UE XnAP ID

9.2.3.16

Allocated at the M-NG-RAN node

YES

reject

S-NG-RAN node UE XnAP ID

M

NG-RAN node UE XnAP ID

9.2.3.16

Allocated at the S-NG-RAN node

YES

reject

F1-C Traffic Container

M

OCTET STRING

Contains an F1-C interface SCTP CHUNK and IP header, or an IP packet to protect the traffic on the F1-C interface as defined in TS 33.501 [28].

YES

reject

9.1.4.2 IAB TRANSPORT MIGRATION MANAGEMENT REQUEST

This message is sent by an F1-terminating IAB-donor to a non-F1-terminating IAB-donor of a boundary IAB-node, for the purpose of setting up, modifying, or releasing (e.g., for the purpose of revoking) the configuration for the migration of boundary and descendant node traffic between two IAB-donors.

Direction: F1-terminating IAB-donor  non-F1-terminating IAB-donor.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.3.1

YES

reject

F1-Terminating IAB-donor UE XnAP ID

M

NG-RAN node UE XnAP ID

9.2.3.16

This IE refers to the Source NG-RAN node UE

XnAP ID or to the M-NG-RAN node UE XnAP

ID, or to the S-NG-RAN node UE XnAP

ID.

YES

reject

Non-F1-Terminating IAB-donor UE XnAP ID

M

NG-RAN node UE XnAP ID

9.2.3.16

This IE refers to the Target NG-RAN node UE

XnAP ID or to the S-NG-RAN node UE XnAP

ID, or to the M-NG-RAN node UE XnAP

ID.

YES

reject

Traffic To Be Added List

0..1

YES

reject

>Traffic To Be Added Item

1 .. <maxnoofTrafficIndexEntries>

–

>>Traffic Index

M

9.2.2.80

–

>>Traffic Profile

M

9.2.2.81

–

>>F1-terminating Topology BH Information

O

9.2.2.82

–

Traffic To Be Modified List

0..1

YES

reject

>Traffic To Be Modified Item

1 .. <maxnoofTrafficIndexEntries>

–

>>Traffic Index

M

9.2.2.80

–

>>Traffic Profile

O

9.2.2.81

–

>>F1-terminating Topology BH Information

O

9.2.2.82

–

Traffic To Be Released Information

O

9.2.2.84

YES

reject

IAB TNL Address Request

O

9.2.2.85

YES

reject

IAB TNL Address Exception

O

9.2.2.98

YES

reject

Range bound

Explanation

maxnoofTrafficIndexEntries

Maximum no. of traffic offloaded to the non-F1-terminating IAB-donor. The value is 1024.

9.1.4.3 IAB TRANSPORT MIGRATION MANAGEMENT RESPONSE

This message is sent by the non-F1-terminating IAB-donor to the F1-terminating IAB-donor of a boundary IAB-node to provide inter-donor transport related configurations for the offloaded traffic.

Direction: non-F1-terminating IAB-donor  F1-terminating IAB-donor.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.3.1

YES

reject

F1-Terminating IAB-Donor UE XnAP ID

M

NG-RAN node UE XnAP ID
9.2.3.16

This IE refers to the Source NG-RAN node UE

XnAP ID or to the M-NG-RAN node UE XnAP

ID, or to the S-NG-RAN node UE XnAP

ID.

YES

reject

Non-F1-Terminating IAB-Donor UE XnAP ID

M

NG-RAN node UE XnAP ID
9.2.3.16

This IE refers to the Target NG-RAN node UE

XnAP ID or to the S-NG-RAN node UE XnAP

ID, or to the M-NG-RAN node UE XnAP

ID.

YES

reject

Traffic Added List

0..1

YES

reject

>Traffic Added Item

1 .. <maxnoofTrafficIndexEntries>

–

>>Traffic Index

M

9.2.2.80

–

>>Non-F1-terminating Topology BH Information

M

9.2.2.83

–

Traffic Modified List

0..1

YES

reject

>Traffic Modified Item

1 .. <maxnoofTrafficIndexEntries>

–

>>Traffic Index

M

9.2.2.80

–

>>Non-F1-terminating Topology BH Information

M

9.2.2.83

–

Traffic Not Added List

0..1

YES

reject

>Traffic Not Added Item

1 .. <maxnoofTrafficIndexEntries>

–

>>Traffic Index

M

9.2.2.80

–

>>Cause

O

9.2.3.2

–

Traffic Not Modified List

0..1

YES

reject

>Traffic Not Modified Item

1 .. <maxnoofTrafficIndexEntries>

–

>>Traffic Index

M

9.2.2.80

–

>>Cause

O

9.2.3.2

–

IAB TNL Address Response

O

9.2.2.86

YES

reject

Traffic Released List

0..1

YES

reject

>Traffic Released Item

1 .. <maxnoofTrafficIndexEntries>

–

>>Traffic Index

M

9.2.2.80

–

>>BH Info List

O

9.2.2.99

–

Range bound

Explanation

maxnoofTrafficIndexEntries

Maximum no. of traffic offloaded to the non-F1-terminating IAB-donor. The value is 1024.

9.1.4.3a IAB TRANSPORT MIGRATION MANAGEMENT REJECT

This message is sent by the non-F1-terminating IAB-donor to inform the F1-terminating IAB-donor that the IAB Transport Migration Management procedure has failed.

Direction: Non-F1-terminating IAB-donor  F1-terminating IAB-donor.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.3.1

YES

reject

F1-Terminating IAB-Donor UE XnAP ID

M

NG-RAN node UE XnAP ID
9.2.3.16

This IE refers to the Source NG-RAN node UE

XnAP ID or to the M-NG-RAN node UE XnAP

ID, or to the S-NG-RAN node UE XnAP

ID.

YES

reject

Non-F1-Terminating IAB-Donor UE XnAP ID

M

NG-RAN node UE XnAP ID
9.2.3.16

This IE refers to the Target NG-RAN node UE

XnAP ID or to the S-NG-RAN node UE XnAP

ID, or to the M-NG-RAN node UE XnAP

ID.

YES

reject

Cause

M

9.2.3.2

YES

ignore

Criticality Diagnostics

O

9.2.3.3

YES

ignore

9.1.4.4 IAB TRANSPORT MIGRATION MODIFICATION REQUEST

This message is sent by a non-F1-terminating IAB-donor to an F1-terminating IAB-donor of a boundary IAB-node, for the purpose of modifying or releasing (e.g., for the purpose of revoking) the configuration for the migrated traffic of boundary IAB-node or descendant IAB-node.

Direction: non-F1-terminating IAB-donor  F1-terminating IAB-donor.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.3.1

YES

reject

F1-Terminating IAB-donor UE XnAP ID

M

NG-RAN node UE XnAP ID

9.2.3.16

This IE refers to the Source NG-RAN node UE

XnAP ID or to the M-NG-RAN node UE XnAP

ID, or to the S-NG-RAN node UE XnAP

ID.

YES

reject

Non-F1-Terminating IAB-donor UE XnAP ID

M

NG-RAN node UE XnAP ID
9.2.3.16

This IE refers to the Target NG-RAN node UE

XnAP ID or to the S-NG-RAN node UE XnAP

ID, or to the M-NG-RAN node UE XnAP

ID.

YES

reject

Traffic Required To Be Modified List

0..1

YES

reject

>Traffic Required To Be Modified Item

1 .. <maxnoofTrafficIndexEntries>

–

>>Traffic Index

M

9.2.2.80

–

>>Non-F1-terminating topology BH information

M

9.2.2.83

–

Traffic To Be Released Information

O

9.2.2.84

YES

reject

IAB TNL Address To Be Added

O

IAB TNL Address Response

9.2.2.86

YES

reject

IAB TNL Address To Be Released List

0..1

YES

reject

>IAB TNL Address To Be Released Item

1..<maxnoofTLAsIAB>

–

>>IAB TNL Address

M

9.2.2.92

–

Range bound

Explanation

maxnoofTrafficIndexEntries

Maximum no. of traffic offloaded to the non-F1-terminating IAB-donor. The value is 1024.

maxnoofTLAsIAB

Maximum total no. of IPv4 address(es), IPv6 address(es) and IPv6 address prefix(es) that can be requested in one procedure execution. The value is 1024.

9.1.4.5 IAB TRANSPORT MIGRATION MODIFICATION RESPONSE

This message is sent by the F1-terminating IAB-donor to the non-F1-terminating IAB-donor of a boundary IAB-node to acknowledge the update of configuration requested by the non-F1-terminating IAB-donor.

Direction: F1-terminating IAB-donor  non-F1-terminating IAB-donor.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.3.1

YES

reject

F1-Terminating IAB-donor UE XnAP ID

M

NG-RAN node UE XnAP ID
9.2.3.16

This IE refers to the Source NG-RAN node UE

XnAP ID or to the M-NG-RAN node UE XnAP

ID, or to the S-NG-RAN node UE XnAP

ID.

YES

reject

Non-F1-Terminating IAB-donor UE XnAP ID

M

NG-RAN node UE XnAP ID
9.2.3.16

This IE refers to the Target NG-RAN node UE

XnAP ID or to the S-NG-RAN node UE XnAP

ID, or to the M-NG-RAN node UE XnAP

ID.

YES

reject

Traffic Required Modified List

0..1

YES

reject

>Traffic Required Modified Item

1 .. <maxnoofTrafficIndexEntries>

–

>>Traffic Index

M

9.2.2.80

–

Traffic Released List IE

0..1

YES

reject

>Traffic Released Item

1 .. <maxnoofTrafficIndexEntries>

–

>>Traffic Index

M

9.2.2.80

–

>>BH Info List

O

9.2.2.99

–

Range bound

Explanation

maxnoofTrafficIndexEntries

Maximum no. of traffic offloaded to the non-F1-terminating IAB-donor. The value is 1024.

9.1.4.6 IAB RESOURCE COORDINATION REQUEST

This message is sent by an F1-terminating/non-F1-terminating IAB-donor to a non-F1-terminating/F1-terminating IAB-donor of a boundary IAB-node, for the purpose of coordination of the semi-static resources of a single or dual-connected boundary IAB-node.

Direction: F1-terminating IAB-donor  non-F1-terminating IAB-donor, non-F1-terminating IAB-donorF1-terminating IAB-donor.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.3.1

YES

reject

F1-terminating IAB-Donor UE XnAP ID

M

NG-RAN node UE XnAP ID
9.2.3.16

This IE refers to the Source NG-RAN node UE

XnAP ID or to the M-NG-RAN node UE XnAP ID or to the S-NG-RAN node UE XnAP ID.

YES

reject

Non F1-terminating IAB-Donor UE XnAP ID

M

NG-RAN node UE XnAP ID
9.2.3.16

This IE refers to the Target NG-RAN node UE

XnAP ID or to the S-NG-RAN node UE XnAP ID or to the M-NG-RAN node UE XnAP ID.

YES

reject

Boundary Node Cells List

0..1

List of cells served by the boundary IAB-node IAB-DU.

YES

reject

>Boundary Node Cells List Item

1 .. <maxnoofServedCellsIAB >

EACH

reject

>>Boundary Node Cell Information

M

IAB Cell Information

9.2.2.94

–

Parent Node Cells List

0..1

List of cells served by the parent node IAB-DU.

YES

reject

>Parent Node Cells List Item

1 .. < maxnoofServingCells >

EACH

reject

>>Parent Node Cell Information

M

IAB Cell Information

9.2.2.94

–

Range bound

Explanation

maxnoofServedCellsIAB

Maximum number of cells served by an IAB-DU or an IAB-donor-DU. Value is 512.

maxnoofServingCells

Maximum no. of serving cells for an IAB-MT. Value is 32, as defined by the maxNrofServingCells in TS 38.331 [10].

9.1.4.7 IAB RESOURCE COORDINATION RESPONSE

This message is sent by a non-F1-terminating/F1-terminating IAB-donor to an F1-terminating/non-F1-terminating IAB-donor of a boundary IAB-node, in response to an IAB RESOURCE COORDINATION REQUEST message.

Direction: non-F1-terminating IAB-donor  F1-terminating IAB-donor, F1-terminating IAB-donor  non-F1-terminating IAB-donor.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

Message Type

M

9.2.3.1

YES

reject

F1-terminating IAB-Donor node UE XnAP ID

M

NG-RAN node UE XnAP ID
9.2.3.16

This IE refers to the Source NG-RAN node UE

XnAP ID or to the M-NG-RAN node UE XnAP ID or to the S-NG-RAN node UE XnAP ID.

YES

reject

Non F1-terminating IAB-Donor node UE XnAP ID

M

NG-RAN node UE XnAP ID
9.2.3.16

This IE refers to the Target NG-RAN node UE

XnAP ID or to the S-NG-RAN node UE XnAP ID or to the M-NG-RAN node UE XnAP ID.

YES

reject

Boundary Node Cells List

0..1

List of cells served by the boundary IAB-node IAB-DU.

YES

reject

>Boundary Node Cells List Item

1 .. <maxnoofServedCellsIAB >

EACH

reject

>>Boundary Node cell Information

M

IAB Cell Information

9.2.2.94

–

Parent-Node Cells List

0..1

List of cells served by the parent node IAB-DU.

YES

reject

>Parent-Node Cells List Item

1 .. < maxnoofServingCells >

EACH

reject

>>Parent Node Cell Information

M

IAB Cell Information

9.2.2.94

–

Range bound

Explanation

maxnoofServedCellsIAB

Maximum number of cells served by an IAB-DU or an IAB-donor-DU. Value is 512.

maxnoofServingCells

Maximum no. of serving cells for an IAB-MT. Value is 32, as defined by the maxNrofServingCells in TS 38.331 [10].