The Xn-Ap interface provides an interface for connecting one gNB Node to another gNb Node in NG-RAN. Multi-RAT Dual Connectivity (MR-DC) and NR-DC is a Dual Connectivity configuration using the 5GC, whereby both the master and secondary RAN nodes are 5G gNBs.
The MR-DC tab is available in gNB CU Node Test Cases.
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NR-DC Configuration |
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SN-Initiated PDU Session Release
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Measurements collected for Xn-AP session related processing are reported on the Xn-AP Session measurement tab.
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gNB Mode
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Select NR-DC for Dual Connectivity configuration using the 5GC. Available in gNB CU Node test case. Select the gNB Mode. Options MN (Master Node) or SN (Secondary Node). The remaining parameters in this tab become available based on gNB mode type. Tcl Parameter: GnbCuNrDcEn Tcl Parameter: GnbCuNrDcMode |
| Number of PSCells |
Select the number of PSCells (Primary Cell). Available when gNB Mode = MN. Range : 1 to 32, default : 1 Enter the PSCell ID, MCC and MNC. The value type of PSCell is defined the same as the NR Cell ID in gnb CU Nodal. Range : 0 to 68719476735. Default : 1 Enter the MCC (Mobile Country Code) and the MNC (Mobile Network Code). Range : 3 digits, default : 000 Tcl Parameter: GnbCuNumPsCells Tcl Parameter: GnbCuNumPsCell_1 |
| UE Aggregate Maximum BitRate Ratio |
Select the UE Aggregate Maximum BitRate Ration in percentage. Available when gNB Mode = MN. Options : 5 % up to 95 % in 5 percent increments Tcl Parameter: GnbCuUeAggMaxRateRatio |
| SN Terminated Bearer |
Select the Number of QoS Flows and Mode for the SN Terminated Bearer. Available when gNB Mode = MN. Currently the Number of QoS Flows is set to All. No other option is available. Currently the Mode is set to Non-GBR and GBR. No other option is available. Tcl Parameter: GnbCuSnTermBearer_1 |
| Split Bearer |
Select the Number of QoS Flows, Mode, UL Threshold and Mn Traffic Ratio for the SN Terminated Bearer. Available when gNB Mode = SN. Currently the Number of QoS Flows is set to All. No other option is available. Currently the Mode is set to Non-GBR and GBR. No other option is available. Select the UL Threshold. Options : b0 (default), b100, b200, b400, b800, b1600, b3200, b6400, b12800, b25600, b51200, b102400, b204800, b409600, b819200, b1228800, b1638400, b2457600, b3276800, b4096000 Select the MN Traffic Ratio. Options : 0, 25%, 50%, 75% Tcl Parameter: GnbCuSplitBearer_1 |
| SN-Initiated PDU Session Release |
Select Enable SN-Initiated PDU Session Release to release all Qos flows of the PDU Session from the UE that has more than one PDU Sessions. Procedure will result always in at least one DRB release. Refer to spec NR C-plane profile specification [2] section 7.2.2.2. Available when gNB Mode = SN and the Number of PDUs is greater than 1 on the gNB CU Node test case. Select PDU Session Release Involvement - With MN. Enter the PDU Session Release Delay (s) in seconds. Range : 5 to 65535, default : 5 Enter the PDU Session Release Number. Range : 1 to Number of PDUs (max 11) default : 1 Spec Reference : 38.473 F1AP 16.6.0/July 2021 in F1 38.331 RRC 16.5.0/July 2021 in RRC/AS-5G 38.423 XnAp 16.6.0/July 2021 in Xn-C O-RAN.WG5.C1-v07.00 O-RAN Open F1/W1/E1/X2/Xn Interface Working Group NR C-plane profile. Tcl Parameter: GnbCuSnPduSessRelEn Tcl Parameter: GnbCuSnPduSessRelWithMn Tcl Parameter: GnbCuSnPduSessRelDelay Tcl Parameter: GnbCuSnPduSessRelNum |
| SN Initiated Release |
Select SN Initiated Release to support S-NG-RAN node initiated S-NG-RAN Node Release procedure to release the UE context and relevant resources at the S-NG-RAN node. Per NR C-plane profile specification [2] section 7.3.3. Available when gNB Mode = MN on the gNB CU Node test case. Select Without Keeping UE (default) or With Keeping UE. Spec Reference : 38.473 F1AP 16.6.0/July 2021 in F1 38.331 RRC 16.5.0/July 2021 in RRC/AS-5G 38.423 XnAp 16.6.0/July 2021 in Xn-C O-RAN.WG5.C1-v07.00 O-RAN Open F1/W1/E1/X2/Xn Interface Working Group NR C-plane profile.
Tcl Parameter: GnbCuSnInitRelEn Tcl Parameter: GnbCuSnInitRel |