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) |