9.3.2 Transport Network Layer Related IEs

37.4833GPPE1 Application Protocol (E1AP)Release 17TS

9.3.2.1 UP Transport Layer Information

The UP Transport Layer Information IE identifies an transport bearer associated to a DRB. It contains a Transport Layer Address and a GTP Tunnel Endpoint Identifier. The Transport Layer Address is an IP address to be used for the user plane transport.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

CHOICE Transport Layer Information

M

>GTP Tunnel

>>Transport Layer Address

M

9.3.2.4

>>GTP-TEID

M

9.3.2.3

9.3.2.2 CP Transport Layer Information

This IE is used to provide the E1 control plane transport layer information associated with an gNB-CU-CP and gNB-CU-UP pair.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

CHOICE CP Transport Layer Information

>Endpoint-IP-address

>> Endpoint IP address

M

Transport Layer Address

9.3.2.4

>Endpoint-IP-address-and-port

YES

reject

>>Endpoint IP address

M

Transport Layer Address

9.3.2.4

>>Port Number

M

BIT STRING (SIZE(16))

9.3.2.3 GTP-TEID

The GTP-TEID IE is the GTP Tunnel Endpoint Identifier to be used for the user plane transport.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

GTP-TEID

M

OCTET STRING (SIZE(4))

For details and range, see TS 29.281 [15].

9.3.2.4 Transport Layer Address

This Transport Layer Address IE is an IP address.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Transport Layer Address

M

BIT STRING (SIZE(1..160, …))

The Radio Network Layer is not supposed to interpret the address information. It should pass it to the Transport Layer for interpretation.

For details, see TS 38.414 [16].

9.3.2.5 Data Forwarding Information Request

This IE offers the possibility for the gNB-CU-CP to request data forwarding addresses to the gNB-CU-UP. It also offers the possibility for the gNB-CU-CP to provide a list of QoS flows subject to PDU Session level or DRB level data forwarding to the gNB to which DRBs or QoS flows have been offloaded.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Data Forwarding Request

M

ENUMERATED (UL, DL, both, …)

QoS Flows forwarded on the forwarding tunnel(s)

O

QoS Flow Mapping List

9.3.1.59

This IE contains information for which QoS flows forwarded data packets are sent on:

– either the PDU Session forwarding tunnel (UL and DL)

– or the DRB forwarding tunnel (UL and DL).

9.3.2.6 Data Forwarding Information

This IE provides the data forwarding information when performing handover or data offloading.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Criticality

Assigned Criticality

UL Data Forwarding

O

UP Transport Layer Information

9.3.2.1

DL Data Forwarding

O

UP Transport Layer Information

9.3.2.1

Data Forwarding to NG-RAN QoS Flow Information List

0..1

Providing QoS flows accepted for data forwarding to the source gNB-CU-UP.

YES

ignore

>Data Forwarding to NG-RAN QoS Flow Information List Item

1..<maxnoofQoSflows>

>>QoS Flow Identifier

M

QoS Flow Identifier

9.3.1.24

9.3.2.7 Transport Network Layer Address Info

This IE is used for signalling TNL address information.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

Transport UP Layer Addresses Info to Add List

0..1

>Transport UP Layer Addresses Info to Add Item

1..<maxnoofTLAs>

>>IPsec Transport Layer Address

M

Transport Layer Address

9.3.2.4

Transport Network Layer address for IPsec endpoint.

>>GTP Transport Layer Addresses To Add List

0..1

>>>GTP Transport Layer Addresses To Add Item

1..<maxnoofGTPTLAs>

>>>>GTP Transport Layer Address Info

M

Transport Layer Address

9.3.2.4

GTP Transport Layer Addresses for GTP end-points.

Transport UP Layer Addresses Info to Remove List

0..1

>Transport UP Layer Addresses Info to Remove Item

1..<maxnoofTLAs>

>>IPsec Transport Layer Address

M

Transport Layer Address

9.3.2.4

Transport Network Layer address for IPsec endpoint.

>>GTP Transport Layer Addresses To Remove List

0..1

>>>GTP Transport Layer Addresses To Remove Item

1..<maxnoofGTPTLAs>

>>>>GTP Transport Layer Address Info

M

Transport Layer Address

9.3.2.4

GTP Transport Layer Addresses for GTP end-points.

Range bound

Explanation

maxnoofTLAs

Maximum no. of Transport Layer Addresses in the message. Value is 16.

maxnoofGTPTLAs

Maximum no. of GTP Transport Layer Addresses for a GTP end-point in the message. Value is 16.

9.3.2.8 URI

This IE is defined to contain a URI address.

IE/Group Name

Presence

Range

IE type and reference

Semantics description

URI

M

VisibleString

String representing URI (Uniform Resource Identifier)