If the gNB-CU cannot accept the setup, it should respond with a F1 SETUP FAILURE and appropriate cause value.
If the F1 SETUP FAILURE message includes the Time To Wait IE, the gNB-DU shall wait at least for the indicated time before reinitiating the F1 setup towards the same gNB-CU.
F1 SETUP RESPONSE
This message is sent by the gNB-CU to transfer information for a TNL association.
Direction: gNB-CU ® gNB-DU
IE/Group Name | Presence | Range | IE type and reference | Semantics description | Criticality | Assigned Criticality |
Message Type | M |
| 9.3.1.1 |
| YES | reject |
Transaction ID | M |
| 9.3.1.23 |
| YES | reject |
gNB-CU Name | O |
| PrintableString(SIZE(1..150,…)) | Human readable name of the gNB-CU. | YES | ignore |
Cells to be Activated List |
| 0.. 1 |
|
|
|
|
>Cells to be Activated List Item |
| 1.. <maxCellingNBDU> |
| List of cells to be activated | YES | reject |
>> NR CGI | M |
| 9.3.1.12 |
| - | - |
>> NR PCI | O |
| INTEGER (0..1007) | Physical Cell ID | - | - |
>>gNB-CU System Information | O |
| 9.3.1.42 | RRC container with system information owned by gNB-CU | - | - |
Range bound | Explanation |
maxCellingNBDU | Maximum no. cells that can be served by a gNB-DU. Value is 512. |
