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NSA Mobility Managment.pptx

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1. The document discusses NSA mobility management for Huawei's 5G network, including procedures for adding, changing, and releasing the secondary node (SgNB). 2. Key procedures covered include SgNB addition triggered by the MeNB, intra-SgNB and inter-SgNB PSCell changes, and intra-MeNB and inter-MeNB handovers. 3. NSA mobility is anchored to the LTE network, with the eNodeB delivering NR measurement configurations and processing measurement reports.

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HUAWEI TECHNOLOGIES CO., LTD. NR NSA Mobility Management
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 2 Contents 1. Terms & Definitions 2. Mobility Management Under NSA DC 3. Mobility Features 4. NSA Mobility Management 5. PSCell Change Process 6. Main Procedures 7. Feature Deployment Script 8. KPIs and Counters
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 3 Terms & Definitions • EN-DC: Is short for E-UTRA-NR Dual Connectivity (DC) and represents dual connectivity between LTE and New Radio (NR). • NSA: Non-standalone. • MN: Master Node. • SN: Secondary Node. • S-SN: Source Secondary Node. • T-SN: Target Secondary Node. • MCG: The Master Cell Group of an NSA DC UE is an LTE cell group configured on the LTE side. • SCG: The Secondary Cell Group of an NSA DC UE is the NR cell group configured on the NR side. • MeNB: The Master eNodeB of an NSA DC UE is the LTE eNodeB that serves the cell on which a UE is currently camping. • SgNB: The Secondary gNodeB of an NSA DC UE is the NR gNodeB configured for the UE through an RRC message sent by the MeNB. • PCell: Is the primary serving cell and represents a primary cell of the Master eNodeB. • PSCell: Is the primary secondary cell and represents a primary cell of a Secondary gNodeB.
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 4 Mobility Management Under NSA DC • In an EN-DC network, the eNodeB serves as the MN and connects to the EPC, and the gNodeB acts as the SN and connects to the eNodeB over an X2 interface. • The LTE network is used as an anchor; the UE can only camp on the LTE network and all idle mode mobility is controlled by that layer. Other Vendor eNodeB cannot be used as an anchor for a Huawei gNodeB, so there will be no 5G service when the UE is on a other eNodeB. • Since the LTE network is used as an anchor the 5G mobility strategy is dictated by the current 3G/4G mobility strategy The current network strategy is that LTE1800 or LTE2100 cells can be used as the anchor but not LTE800 cells. • All NR signaling messages are delivered through the eNodeB. The gNodeB sends measurement configurations to the eNodeB through the X2 interface and the eNodeB then forwards these configurations to UEs. UEs report measurement results to the eNodeB, and the eNodeB transfers the results to the gNodeB over the X2 interface to support PSCell changes. • The SgNB is responsible for its mobility management, including measurement control and RRC connection reconfiguration. • The X2 interface will be defined between sites (inter-site) but at the moment the issue is that there is no redundancy (if the SeGW goes down). There isn’t any redundancy for the LTE X2 link either but the difference is that in LTE the S1 link can be used if the X2 goes down.
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 5 Option 3x (SCG split bearer) The user-plane data is first transmitted from the core network to the PDCP layer of the gNodeB. Then, the PDCP layer of the gNodeB distributes the data to the RLC layer of the eNodeB through the X2 interface
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 6 Feature Deployment: License Packaging Feature ID Feature Name Basic Or Optional Sales Unit Sales NE Control NE FOFD-021209 Inter-RAT Mobility From NG-RAN to E-UTRAN Optional per Cell gNodeB gNodeB FOFD-021210 Voice Fallback Optional per Cell gNodeB gNodeB Feature ID Feature Name Basic Or Optional Sales Unit Sales NE Control NE LEOFD-151330 Inter-RAT Mobility From E-UTRAN to NG-RAN Optional per Cell eNodeB eNodeB LEOFD-151331 E-UTRAN to NG-RAN Traffic Steering Optional per Cell eNodeB eNodeB LEOFD-151332 Fast Return From E-UTRAN to NG-RAN Optional per Cell eNodeB eNodeB 5G 4G FDD Feature ID Feature Name Summary FBFD-010014 Mobility Management  NSA Mobility Management  SA Mobility Management in Connected Mode  SA Mobility Management in Idle Mode 5G
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 7 NSA Mobility Management 1. NSA access: same as LTE access. 2. The eNodeB delivers event B1 measurement configuration for NR SgNB addition. • Only coverage-based handover is supported in the current release. Mobility Scenario SgNB addition The eNodeB periodically adds an SgNB for a UE after an initial access, incoming handover, incoming reestablishment, or initial addition failure. SgNB change/modification SgNB Modification: intra-frequency handover within a gNodeB SgNB Change: intra-frequency handover between gNodeBs MeNB handover with SgNB modification Intra-frequency or inter-frequency handover within an eNodeB, or between eNodeBs, based on event A3. The NR side initiates an RRC connection reconfiguration, instructing the UE to re-access the cell. SgNB release The UE moves out of the gNodeB coverage area (event A2 is reported or RLC retransmissions exceed the specified threshold) and the SgNB is released. • Note: data forwarding during SgNB modification, change and release is supported.
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 8 Main Procedures: SgNB Addition Triggered by the MeNB 1. After receiving the B1 measurement report, the Huawei MeNB triggers an SgNB addition procedure by sending an SgNB Addition Request message to the SgNB. 2. After the admission control is complete and the SgNB allocates resources, the SgNB returns an SgNB Addition Request Acknowledge message to the MeNB. 3. The MeNB sends an RRC Connection Reconfiguration message to the UE. This message contains the NR RRC configuration message. 4. The UE returns an RRC Connection Reconfiguration Complete message to the MeNB, including the NR RRC response message. 5. The MeNB sends an SgNB Reconfiguration Complete message to the SgNB to confirm that the UE has completed the reconfiguration procedure. 6. If the bearers configured for the UE require SCG radio resources, the UE synchronizes with the SgNB PSCell and initiates random access to the SgNB PSCell. In the current network, blind PSCell addition and the initial data volume check are disabled. Hence, the MeNB triggers measurement-based PSCell configuration (based on B1 events) immediately if no VoLTE call is ongoing.
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 9 NSA Mobility Management PSCell Change Within a Base Station PSCell Change Between Base Stations PSCell is changed to another cell under the same SgNB. In this case, the SgNB modification procedure applies. A PSCell is changed to another cell under a different SgNB. In this case, the SgNB change procedure applies In NR, event A3 is used to trigger a PSCell change. Event A3 indicates that the signal quality of a neighboring cell is higher than that of the serving cell by a certain threshold. A maximum of four cells can be contained in one event A3 measurement report, and the number of times of reporting one measurement event is unlimited
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 10 PSCell Change Process 1. Measurement configuration delivery • The gNodeB transfers measurement configurations to the LTE MeNB over the X2 interface and the LTE MeNB forwards them to the UE. • In 5G RAN2.1, only intra-frequency measurements based on event A3 are supported. 2. UE reporting of measurement results • If the criteria for reporting an event A3 are satisfied, the UE reports the measurement results of the serving and neighboring cells to the LTE MeNB and the LTE MeNB forwards the results to the SgNB through the X2 interface. • Reporting criteria for event A3: The RSRP of a neighboring cell is greater than that of the serving cell by a certain margin. 3. SgNB change/modification decision • The gNodeB selects the cell with the best signal quality from the target cell list and attempts to perform an SgNB change/modification. 4. SgNB change/modification execution • The gNodeB performs the SgNB change/modification. Type Condition Action Entering event A3 Mn + Ofn + Ocn – Hys > Ms + Ofs + Ocs + Off Event A3 is reported for the neighbouring cell. Leaving event A3 Mn + Ofn + Ocn + Hys < Ms + Ofs + Ocs + Off Event A3 reporting is stopped for the neighbouring cell.
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 11 Process-Intra-SgNB Change UE MeNB 1. NR A3 Measure Control 2. NR A3 Measure Report 5. RRC CONN RECFG(NR Reconfig) 6. RRC CONN RECFG CMP 8. Random Access SgNB 3. RRC Transfer (NR A3) 4. SgNB Mod Req 7. SgNB Modification Confirm 1. The SgNB sends an A3 measurement control message to the UE. 2. The UE sends an event A3 measurement report to the MeNB. 3. The MeNB forwards the A3 measurement report to the SgNB. 4. The SgNB initiates a change request to the MeNB. 5. The MeNB sends a reconfiguration command to the UE, carrying the NR configuration. 6. The UE sends a reconfiguration completion message to the MeNB. 7. The MeNB forwards the reconfiguration completion message to the SgNB. 8. The UE sends a random access request to the SgNB. 1. NR A3 Measure Control The eNodeB transparently transmits the NR A3 measurement report.
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 12 Process-Inter-SgNB Change UE MeNB 1. NR A3 Measure Control 2. NR A3 Measure Report 7. RRC CONN RECFG(NR Config) 8. RRC CONN RECFG CMP S-SgNB 9. SgNB Change Confirm MME 15. E-RAB Modification Indication 10. SgNB Reconfig CMP 16. E-RAB Modification Confirm 3. RRC Transfer (NR A3) 4. SgNB Change Required 5. SgNB Addition Request 6. SgNB Addition Request Acknowledge T-SgNB 12. SN Status Transfer 13. SN Status Transfer 1. The S-SgNB sends an A3 measurement control message to the UE. 2. The UE sends an A3 measurement report to the MeNB to report a stronger NR neighboring cell. 3. The MeNB forwards the measurement information to the S-SgNB. 4. The S-SgNB initiates an NR change request to the MeNB. 5. The MeNB sends an NR addition request to the T-SgNB. 6. The T-SgNB sends an NR addition acknowledge message to the MeNB. 7. The MeNB sends a reconfiguration message to the UE, carrying NR Config. 8. The UE sends a reconfiguration completion message to the MeNB. 9. The MeNB sends a reconfiguration confirmation message to the S-SgNB. 10. The MeNB sends a reconfiguration completion message to the T-SgNB. 11. The UE sends a random access request to the T-SgNB. 12. The S-SgNB sends an SN status transfer message to the MeNB (only when the RLC mode is AM). 13. The MeNB forwards the SN status transfer message to the T-SgNB (only when the RLC mode is AM). 14. The S-SgNB forwards data to the T-SgNB. 15. The MeNB sends a bearer change indication message to the core network. 16. The core network sends a bearer change confirmation message to the MeNB. 17. The MeNB sends a context release request to the S-SgNB. 17. UE Context Release 1. NR A3 Measure Control 14. Data Forwarding 11. Random Access
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 13 Process-Intra-MeNB Handover UE MeNB 1. LTE A3/A4 Measure Control 2. LTE A3/A4 Measure Report 5. RRC CONN RECFG(LTE intra-eNB HO CMD) 7. RRC CONN RECFG CMP SgNB 3. SgNB Mod Req 4. SgNB Mod Req Ack 8. SgNB Reconfig CMP 6. Random Access 9. Random Access 1. The MeNB sends a measurement control message to the UE. 2. The UE sends a measurement report to the MeNB to report a stronger neighboring LTE cell. 3. When an LTE handover occurs and the key is changed, the MeNB sends a modification request to the SgNB, instructing the NR side to modify the PDCP key. 4. The SgNB sends a modification request acknowledge message to the MeNB. 5. The MeNB sends an LTE handover command to the UE, carrying the NR configuration. 6. The UE resends a random access request to the MeNB. 7. The UE sends a handover completion message to the MeNB. 8. The MeNB sends a reconfiguration completion message to the SgNB. 9. The UE sends a random access request to the SgNB. This process is always initiated by the Huawei MeNB and it is based on the normal intra- frequency and inter-frequency procedures used in LTE. It should be noted that in the current design the PSCell is not changed during the MeNB handover procedure
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 14 Process-Inter-MeNB Handover UE S- eNB S-GW MME 1. LTE A3/A4 Measure Control 2. LTE A3/A4 Measure Report 3. HO Req 6. HO Req Ack 8. RRC CONN RECFG 10. RRC CONN RECFG CMP 13. Path Switch S- gNB 14. UE Context Rel 7. SgNB Rel Req 15. UE Context Rel T-eNB 5. SgNB Add Req ACK 4. SgNB Add Req 12. SgNB Recfg CMP 9. Random Access 11. Random Access 1. The S-eNB sends an LTE measurement control message to the UE. 2. The UE sends a measurement report to the S-eNB, indicating a stronger inter-eNodeB neighboring LTE cell. 3. The S-eNB sends a handover request to the T-eNB. 4. The T-eNB sends an addition request to the S-gNB. 5. The S-gNB sends an addition acknowledge message to the T-eNB. 6. The T-eNB sends a handover acknowledge message to the S-eNB. 7. The S-eNB sends a release request to the S-gNB. 8. The S-eNB sends an inter-eNodeB handover command to the UE. 9. The UE sends a random access request to the target cell. 10. The UE sends a handover completion message to the target LTE cell. 11. The UE sends a random access request to the S-gNB. 12. The T-eNB sends a reconfiguration completion message to the S-gNB. 13. The T-eNB sends a path switch message to the core network. 14. The T-eNB sends a context release request to the S-eNB. 15. The S-eNB sends a context release request to the S-gNB. Important Notes:- If the handover is from an MeNB to a Huawei eNB (that doesn’t support NSA DC), the SgNB is released before the MeNB handover is executed. If the handover is from an MeNB to a Samsung eNB, the SgNB is not released and 5G will be dropped after the handover. Handover to LTE800 will result in the SgNB being released since the 3UK strategy is to only enable anchoring on LTE1800 and LTE2100 cells.
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 15 Process-SgNB Release The SgNB release (PSCell deletion) can be triggered by either:- 1. The Huawei MeNB due to SCG link faulty or packets lost; or 2. The SgNB due to A2 threshold, UE inactivity, X2 delay or packets lost. The coverage (A2) threshold is triggered if the PSCell RSRP decreases below a defined threshold: Note that the A2 time to trigger is fixed (not configurable) at 640ms 1. After receiving the A2 measurement report the SgNB sends an SgNB Release Required message to initiate an SgNB release procedure. 2. The MeNB sends an SgNB Release Confirm message to the SgNB to confirm that the SgNB is released. After receiving this message, the SgNB stops sending data to the UE. 3. NSA DC RRC disconnection is exactly the same as LTE RRC disconnection, so it is not covered in this document.
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 16 Parameters to set on 4G sites to enable 5G mobility # Set PSCell addition B1 threshold and time to trigger MOD NRSCGFREQCONFIG: PccDlEarfcn=xxxx, ScgDlArfcn=*, ScgDlArfcnPriority=1, NsaDcB1ThldRsrp=-115, NrB1TimeToTrigger=512MS; # Point NSA DC UEs to the same mobility groups used by non-NSA DC UEs MOD CELLQCIPARA: LOCALCELLID=0, QCI=1, NsaDcInterFreqHoGroupId=0, NsaDcInterRatHoCommGroupId=0, NsaDcUtranHoGroupId=0, NsaDcIntraFreqHoGroupId=0; MOD CELLQCIPARA: LOCALCELLID=0, QCI=2, NsaDcInterFreqHoGroupId=0, NsaDcInterRatHoCommGroupId=0, NsaDcUtranHoGroupId=0, NsaDcIntraFreqHoGroupId=0; MOD CELLQCIPARA: LOCALCELLID=0, QCI=3, NsaDcInterFreqHoGroupId=0, NsaDcInterRatHoCommGroupId=0, NsaDcUtranHoGroupId=0, NsaDcIntraFreqHoGroupId=0; MOD CELLQCIPARA: LOCALCELLID=0, QCI=4, NsaDcInterFreqHoGroupId=0, NsaDcInterRatHoCommGroupId=0, NsaDcUtranHoGroupId=0, NsaDcIntraFreqHoGroupId=0; MOD CELLQCIPARA: LOCALCELLID=0, QCI=5, NsaDcInterFreqHoGroupId=1, NsaDcInterRatHoCommGroupId=1, NsaDcUtranHoGroupId=1, NsaDcIntraFreqHoGroupId=1; MOD CELLQCIPARA: LOCALCELLID=0, QCI=6, NsaDcInterFreqHoGroupId=1, NsaDcInterRatHoCommGroupId=1, NsaDcUtranHoGroupId=1, NsaDcIntraFreqHoGroupId=1; MOD CELLQCIPARA: LOCALCELLID=0, QCI=7, NsaDcInterFreqHoGroupId=1, NsaDcInterRatHoCommGroupId=1, NsaDcUtranHoGroupId=1, NsaDcIntraFreqHoGroupId=1; MOD CELLQCIPARA: LOCALCELLID=0, QCI=8, NsaDcInterFreqHoGroupId=1, NsaDcInterRatHoCommGroupId=1, NsaDcUtranHoGroupId=1, NsaDcIntraFreqHoGroupId=1; MOD CELLQCIPARA: LOCALCELLID=0, QCI=9, NsaDcInterFreqHoGroupId=1, NsaDcInterRatHoCommGroupId=1, NsaDcUtranHoGroupId=1, NsaDcIntraFreqHoGroupId=1;
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 17 Parameters to set on 5G sites to enable Mobility # Define Intra-frequency handover group MOD NRCELLQCIBEARER: NrCellId=101, Qci=1, IntraFreqHoMeasGroupId=0; MOD NRCELLQCIBEARER: NrCellId=101, Qci=2, IntraFreqHoMeasGroupId=0; MOD NRCELLQCIBEARER: NrCellId=101, Qci=3, IntraFreqHoMeasGroupId=0; MOD NRCELLQCIBEARER: NrCellId=101, Qci=4, IntraFreqHoMeasGroupId=0; MOD NRCELLQCIBEARER: NrCellId=101, Qci=5, IntraFreqHoMeasGroupId=0; MOD NRCELLQCIBEARER: NrCellId=101, Qci=6, IntraFreqHoMeasGroupId=0; MOD NRCELLQCIBEARER: NrCellId=101, Qci=7, IntraFreqHoMeasGroupId=0; MOD NRCELLQCIBEARER: NrCellId=101, Qci=8, IntraFreqHoMeasGroupId=0; MOD NRCELLQCIBEARER: NrCellId=101, Qci=9, IntraFreqHoMeasGroupId=0; # Set Intra-frequency handover parameters MOD NRCELLINTRAFHOMEAGRP: NrCellId=101, IntraFreqHoMeasGroupId=0, IntraFreqHoA3Offset=2, IntraFreqHoA3Hyst=2, IntraFreqHoA3TimeToTrig=320MS; # Set filter coefficients for measurements MOD NRCELLMOBILITYCONFIG: NrCellId=101, BeamRsrpFilterCoeff=FC4, CellRsrpFilterCoeff=FC4; # Set coverage A2 threshold for PSCell removal MOD NRCellNsaDcConfig: NrCellId=101, PscellA2RsrpThld=-121;
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 18 Main KPIs Formulas KPI name KPI formula Success rate of PCell change L.NsaDc.PCell.Change.Succ/L.NsaDc.PCell.Change.Exec x 100% SgNB addition success rate L.NsaDc.SgNB.Add.Succ/L.NsaDc.SgNB.Add.Att x 100% [SgNB addition success rate] ( [N.NsaDc.SgNB.Add.Succ] / [N.NsaDc.SgNB.Add.Att] )*{100} [Intra-SgNB PSCell change success rate] ( [N.NsaDc.IntraSgNB.PSCell.Change.Succ] / [N.NsaDc.IntraSgNB.PSCell.Change.Att] )*{100} [Inter-SgNB PSCell change success rate] ( [N.NsaDc.InterSgNB.PSCell.Change.Succ] / [N.NsaDc.InterSgNB.PSCell.Change.Att] )*{100} NR drop rate ( [N.NsaDc.SgNB.AbnormRel] / [N.NsaDc.SgNB.Rel] )*{100} User Downlink Average Throughput(NR) User Downlink Average Throughput(NR) = (N.ThpVol.DL - N.ThpVol.DL.LastSlot) / N.ThpTime.DL.RmvLastSlot User Uplink Average Throughput(NR) User Uplink Average Throughput(NR) = (N.ThpVol.UL- N.ThpVol.UE.UL.SmallPkt) / N.ThpTime.UE.UL.RmvSmallPkt Cell Downlink Average Throughput Cell Downlink Average Throughput = N.ThpVol.DL.Cell / N.ThpTime.DL.Cell Cell Uplink Average Throughput Cell Uplink Average Throughput = N.ThpVol.UL.Cell / N.ThpTime.UL.Cell Downlink Resource Block Utilizing Rate Downlink Resource Block Utilizing Rate =(N.PRB.DL.Used.Avg/N.PRB.DL.Avail.Avg)× 100% Uplink Resource Block Utilizing Rate Uplink Resource Block Utilizing Rate =(N.PRB.UL.Used.Avg/N.PRB.UL.Avail.Avg)× 100% Radio Network Unavailability Rate Radio Network Unavailability Rate =( [N.Cell.Unavail.Dur.System.Avg] + [N.Cell.Unavail.Dur.Manual.Avg] )/({GP}*{60})*100 Downlink Traffic Volume Downlink Traffic Volume =N.ThpVol.DL Uplink Traffic Volume Uplink Traffic Volume = N.ThpVol.UL Average User Number NSA: Average User Number =N.User.RRCConn.Avg [DRB setup success rate] ( [N.NsaDc.DRB.Add.Succ] / [N.NsaDc.DRB.Add.Att] )*{100}
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 19 LTE Counter- NSA DC Counters Counter ID Counter Name Counter Description 1526747851 L.NsaDc.SgNB.Add.Att Total number of SgNB addition attempts for UEs that treat the local cell as their PCell in the LTE-NR NSA DC state 1526747852 L.NsaDc.SgNB.Add.Succ Total number of successful SgNB additions for UEs that treat the local cell as their PCell in the LTE-NR NSA DC state 1526747853 L.NsaDc.SCG.Change.Att Total number of SCG change attempts for UEs that treat the local cell as their PCell in the LTE-NR NSA DC state 1526747854 L.NsaDc.SCG.Change.Succ Total number of successful SCG changes for UEs that treat the local cell as their PCell in the LTE-NR NSA DC state 1526747855 L.NsaDc.SgNB.Rmv.Att Total number of SgNB removal attempts for UEs that treat the local cell as their PCell in the LTE-NR NSA DC state 1526747856 L.NsaDc.ScgFailure Total number of SCG-related failures for UEs that treat the local cell as their PCell in the LTE-NR NSA DC state 1526748735 L.NsaDc.PCell.Change.Exec Number of PCell change executions in LTE-NR NSA DC scenarios 1526748736 L.NsaDc.PCell.Change.Succ Number of successful PCell changes in LTE-NR NSA DC scenarios 1526748737 L.NsaDc.E-RAB.AbnormRel Total number of abnormal E-RAB releases in LTE-NR NSA DC scenarios 1526748825 L.NsaDc.SCG.Mod.Req.Att Number of SCG modification attempts for UEs that treat the local cell as their PCell in the LTE-NR NSA DC state 1526748826 L.NsaDc.SCG.Mod.Req.Succ Number of successful SCG modifications for UEs that treat the local cell as their PCell in the LTE-NR NSA DC state 1526748827 L.NsaDc.SCG.Mod.Required.Att Number of SCG modification attempts received by UEs in the LTE-NR NSA DC state in a cell 1526748828 L.NsaDc.SCG.Mod.Required.Succ Number of successful SCG modifications received by UEs in the LTE-NR NSA DC state in a cell 1526748829 L.NsaDc.E-RAB.Mod.Ind.Att Number of E-RAB modification attempts initiated by UEs in the LTE-NR NSA DC state in a cell 1526748830 L.NsaDc.E-RAB.Mod.Ind.Succ Number of successful E-RAB modifications initiated by UEs in the LTE-NR NSA DC state in a cell 1526755742 L.NsaDc.E-RAB.NormRel Total number of normal E-RAB releases for NSA DC UEs 1526755743 L.NsaDc.HHO.PrepAttOut Number of outgoing handover preparation attempts for NSA DC UEs 1526755744 L.NsaDc.HHO.ExecAttOut Number of outgoing handover executions for NSA DC UEs 1526755745 L.NsaDc.HHO.ExecSuccOut Number of successful outgoing handovers for NSA DC UEs
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 20 5G Counters- NSA DC Measurements Counter ID Counter Name Counter Description 1911816746 N.NsaDc.SgNB.Add.Att Number of SgNB addition requests in the LTE-NR NSA DC scenario 1911816747 N.NsaDc.SgNB.Add.Succ Number of successful SgNB additions in the LTE-NR NSA DC scenario 1911816748 N.NsaDc.InterSgNB.PSCell.Change.Att Number of inter-SgNB PSCell change requests in the LTE-NR NSA DC scenario 1911816749 N.NsaDc.InterSgNB.PSCell.Change.Succ Number of successful inter-SgNB PSCell changes in the LTE-NR NSA DC scenario 1911816750 N.NsaDc.IntraSgNB.PSCell.Change.Att Number of intra-SgNB PSCell change requests in the LTE-NR NSA DC scenario 1911816751 N.NsaDc.IntraSgNB.PSCell.Change.Succ Number of successful intra-SgNB PSCell changes in the LTE-NR NSA DC scenario 1911816752 N.NsaDc.SgNB.Rel Total number of SgNB releases in the LTE-NR NSA DC scenario 1911816753 N.NsaDc.SgNB.AbnormRel.Radio Total number of abnormal SgNB releases in the LTE-NR NSA DC scenarios caused by radio layer issues 1911816754 N.NsaDc.DRB.Add.Att Number of DRB addition requests for LTE-NR NSA DC UEs on the SgNB 1911816755 N.NsaDc.DRB.Add.Succ Number of successful DRB additions for LTE-NR NSA DC UEs on the SgNB 1911816756 N.NsaDc.DRB.Rel Number of DRB releases for LTE-NR NSA DC UEs on the SgNB 1911816757 N.NsaDc.DRB.AbnormRel Number of abnormal DRB releases for LTE-NR NSA DC UEs on the SgNB 1911816836 N.NsaDc.SgNB.AbnormRel.Radio.SUL Total number of abnormal SgNB releases in the LTE-NR NSA DC scenarios caused by radio layer issues of the SUL 1911816843 N.NsaDc.SgNB.Rel.Coverage Number of coverage-based SgNB releases in LTE-NR NSA DC scenarios 1911817841 N.NsaDc.SgNB.Rel.SgNBTrigger Total number of SgNB releases triggered by SgNB in LTE-NR NSA DC scenarios 1911817842 N.NsaDc.SgNB.AbnormRel.Trans Total Number of abnormal SgNB releases due to the transport layer in LTE-NR NSA DC scenarios 1911817843 N.NsaDc.SgNB.AbnormRel Total number of abnormal SgNB releases triggered by SgNB in LTE-NR NSA DC scenarios 1911817848 N.NsaDc.IntraSgNB.PSCell.Change.Fail.Conflict Number of intra-SgNB PSCell change failures caused by procedure conflicts in LTE-NR NSA DC scenarios 1911817849 N.NsaDc.InterSgNB.PSCell.Change.Fail.Conflict Number of inter-SgNB PSCell change failures caused by procedure conflicts in LTE-NR NSA DC scenarios 1911817850 N.NsaDc.SgNB.Mod.Req.Fail.Radio Number of failures of SgNB modifications initiated by the MeNB due to radio faults in LTE-NR NSA DC scenarios 1911817851 N.NsaDc.SgNB.Mod.Req.Fail.TNL Number of failures of SgNB modifications initiated by the MeNB due to transmission faults in LTE-NR NSA DC scenarios 1911817852 N.NsaDc.SgNB.Mod.Req.Succ Number of successful SgNB modifications initiated by the MeNB in LTE-NR NSA DC scenarios 1911817853 N.NsaDc.SgNB.Mod.Req.Att Number of SgNB modification attempts initiated by the MeNB in LTE-NR NSA DC scenarios 1911817854 N.NsaDc.SgNB.Add.Fail.Radio Number of SgNB addition failures caused by radio faults in LTE-NR NSA DC scenarios 1911817855 N.NsaDc.SgNB.Add.Fail.Radio.NoRes Number of SgNB addition failures caused by the unavailability of radio resources in LTE-NR NSA DC scenarios 1911817856 N.NsaDc.SgNB.Add.Fail.TNL Number of SgNB addition failures caused by transmission faults in LTE-NR NSA DC scenarios 1911817857 N.NsaDc.SgNB.AbnormRel.Radio.UeLost Number of abnormal SgNB releases initiated by the SgNB caused by UE LOST 1911817858 N.NsaDc.SgNB.AbnormRel.NoReply Number of abnormal SgNB releases initiated by the SgNB caused by no response
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 21 5G NR – Inter-SgNB PSCell Change SR [BXXXXX] BYYYYY OA @ 27th Feb 2020 Summary:-  From SON log analysis, X2 interface wasn’t established earlier although neighbor external cell has been defined due to maximum x2 interface(384) reached for this site.  X2 interface between Site BXXXXX and BYYYYY was established on 3rd March 2020; issue resolved after X2 interface between gNB created. 1.17k m 3843 11869 Analysis:- From trace found out the SGNB_Change_Refuse due to failure of “Transport-resource-unvailable”
HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 22 5G NR – [Analysis] Inter-SgNB Change SR From MAN101 BRD, main inter-SgNB change failure due to “X2_SGNB_CHANGE_REFUSE/TRANSP_RSRC_UNAVAILABLE_CAU SE_TRANSP” MAN004 LTE X2 interface MAN004 (615) MAN101 (751) MAN101 (751) MAN004 (615) MAN101 LTE X2 interface From BRD of MAN101, main failure due to “X2_SGNB_CHANGE_REFUSE/TRANS P_RSRC_UNAVAILABLE_CAUSE_TR ANSP “; further check found MAN004 and MAN101 X2 are facing SCTP link issue; which suspect causing the failures on inter-SgNB change. Issue normalizing after 28th March.
Thank you www.huawei.com Copyright © 2019 Huawei Technologies Co., Ltd. All Rights Reserved.

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NSA Mobility Managment.pptx

  • 1. HUAWEI TECHNOLOGIES CO., LTD. NR NSA Mobility Management
  • 2. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 2 Contents 1. Terms & Definitions 2. Mobility Management Under NSA DC 3. Mobility Features 4. NSA Mobility Management 5. PSCell Change Process 6. Main Procedures 7. Feature Deployment Script 8. KPIs and Counters
  • 3. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 3 Terms & Definitions • EN-DC: Is short for E-UTRA-NR Dual Connectivity (DC) and represents dual connectivity between LTE and New Radio (NR). • NSA: Non-standalone. • MN: Master Node. • SN: Secondary Node. • S-SN: Source Secondary Node. • T-SN: Target Secondary Node. • MCG: The Master Cell Group of an NSA DC UE is an LTE cell group configured on the LTE side. • SCG: The Secondary Cell Group of an NSA DC UE is the NR cell group configured on the NR side. • MeNB: The Master eNodeB of an NSA DC UE is the LTE eNodeB that serves the cell on which a UE is currently camping. • SgNB: The Secondary gNodeB of an NSA DC UE is the NR gNodeB configured for the UE through an RRC message sent by the MeNB. • PCell: Is the primary serving cell and represents a primary cell of the Master eNodeB. • PSCell: Is the primary secondary cell and represents a primary cell of a Secondary gNodeB.
  • 4. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 4 Mobility Management Under NSA DC • In an EN-DC network, the eNodeB serves as the MN and connects to the EPC, and the gNodeB acts as the SN and connects to the eNodeB over an X2 interface. • The LTE network is used as an anchor; the UE can only camp on the LTE network and all idle mode mobility is controlled by that layer. Other Vendor eNodeB cannot be used as an anchor for a Huawei gNodeB, so there will be no 5G service when the UE is on a other eNodeB. • Since the LTE network is used as an anchor the 5G mobility strategy is dictated by the current 3G/4G mobility strategy The current network strategy is that LTE1800 or LTE2100 cells can be used as the anchor but not LTE800 cells. • All NR signaling messages are delivered through the eNodeB. The gNodeB sends measurement configurations to the eNodeB through the X2 interface and the eNodeB then forwards these configurations to UEs. UEs report measurement results to the eNodeB, and the eNodeB transfers the results to the gNodeB over the X2 interface to support PSCell changes. • The SgNB is responsible for its mobility management, including measurement control and RRC connection reconfiguration. • The X2 interface will be defined between sites (inter-site) but at the moment the issue is that there is no redundancy (if the SeGW goes down). There isn’t any redundancy for the LTE X2 link either but the difference is that in LTE the S1 link can be used if the X2 goes down.
  • 5. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 5 Option 3x (SCG split bearer) The user-plane data is first transmitted from the core network to the PDCP layer of the gNodeB. Then, the PDCP layer of the gNodeB distributes the data to the RLC layer of the eNodeB through the X2 interface
  • 6. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 6 Feature Deployment: License Packaging Feature ID Feature Name Basic Or Optional Sales Unit Sales NE Control NE FOFD-021209 Inter-RAT Mobility From NG-RAN to E-UTRAN Optional per Cell gNodeB gNodeB FOFD-021210 Voice Fallback Optional per Cell gNodeB gNodeB Feature ID Feature Name Basic Or Optional Sales Unit Sales NE Control NE LEOFD-151330 Inter-RAT Mobility From E-UTRAN to NG-RAN Optional per Cell eNodeB eNodeB LEOFD-151331 E-UTRAN to NG-RAN Traffic Steering Optional per Cell eNodeB eNodeB LEOFD-151332 Fast Return From E-UTRAN to NG-RAN Optional per Cell eNodeB eNodeB 5G 4G FDD Feature ID Feature Name Summary FBFD-010014 Mobility Management  NSA Mobility Management  SA Mobility Management in Connected Mode  SA Mobility Management in Idle Mode 5G
  • 7. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 7 NSA Mobility Management 1. NSA access: same as LTE access. 2. The eNodeB delivers event B1 measurement configuration for NR SgNB addition. • Only coverage-based handover is supported in the current release. Mobility Scenario SgNB addition The eNodeB periodically adds an SgNB for a UE after an initial access, incoming handover, incoming reestablishment, or initial addition failure. SgNB change/modification SgNB Modification: intra-frequency handover within a gNodeB SgNB Change: intra-frequency handover between gNodeBs MeNB handover with SgNB modification Intra-frequency or inter-frequency handover within an eNodeB, or between eNodeBs, based on event A3. The NR side initiates an RRC connection reconfiguration, instructing the UE to re-access the cell. SgNB release The UE moves out of the gNodeB coverage area (event A2 is reported or RLC retransmissions exceed the specified threshold) and the SgNB is released. • Note: data forwarding during SgNB modification, change and release is supported.
  • 8. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 8 Main Procedures: SgNB Addition Triggered by the MeNB 1. After receiving the B1 measurement report, the Huawei MeNB triggers an SgNB addition procedure by sending an SgNB Addition Request message to the SgNB. 2. After the admission control is complete and the SgNB allocates resources, the SgNB returns an SgNB Addition Request Acknowledge message to the MeNB. 3. The MeNB sends an RRC Connection Reconfiguration message to the UE. This message contains the NR RRC configuration message. 4. The UE returns an RRC Connection Reconfiguration Complete message to the MeNB, including the NR RRC response message. 5. The MeNB sends an SgNB Reconfiguration Complete message to the SgNB to confirm that the UE has completed the reconfiguration procedure. 6. If the bearers configured for the UE require SCG radio resources, the UE synchronizes with the SgNB PSCell and initiates random access to the SgNB PSCell. In the current network, blind PSCell addition and the initial data volume check are disabled. Hence, the MeNB triggers measurement-based PSCell configuration (based on B1 events) immediately if no VoLTE call is ongoing.
  • 9. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 9 NSA Mobility Management PSCell Change Within a Base Station PSCell Change Between Base Stations PSCell is changed to another cell under the same SgNB. In this case, the SgNB modification procedure applies. A PSCell is changed to another cell under a different SgNB. In this case, the SgNB change procedure applies In NR, event A3 is used to trigger a PSCell change. Event A3 indicates that the signal quality of a neighboring cell is higher than that of the serving cell by a certain threshold. A maximum of four cells can be contained in one event A3 measurement report, and the number of times of reporting one measurement event is unlimited
  • 10. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 10 PSCell Change Process 1. Measurement configuration delivery • The gNodeB transfers measurement configurations to the LTE MeNB over the X2 interface and the LTE MeNB forwards them to the UE. • In 5G RAN2.1, only intra-frequency measurements based on event A3 are supported. 2. UE reporting of measurement results • If the criteria for reporting an event A3 are satisfied, the UE reports the measurement results of the serving and neighboring cells to the LTE MeNB and the LTE MeNB forwards the results to the SgNB through the X2 interface. • Reporting criteria for event A3: The RSRP of a neighboring cell is greater than that of the serving cell by a certain margin. 3. SgNB change/modification decision • The gNodeB selects the cell with the best signal quality from the target cell list and attempts to perform an SgNB change/modification. 4. SgNB change/modification execution • The gNodeB performs the SgNB change/modification. Type Condition Action Entering event A3 Mn + Ofn + Ocn – Hys > Ms + Ofs + Ocs + Off Event A3 is reported for the neighbouring cell. Leaving event A3 Mn + Ofn + Ocn + Hys < Ms + Ofs + Ocs + Off Event A3 reporting is stopped for the neighbouring cell.
  • 11. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 11 Process-Intra-SgNB Change UE MeNB 1. NR A3 Measure Control 2. NR A3 Measure Report 5. RRC CONN RECFG(NR Reconfig) 6. RRC CONN RECFG CMP 8. Random Access SgNB 3. RRC Transfer (NR A3) 4. SgNB Mod Req 7. SgNB Modification Confirm 1. The SgNB sends an A3 measurement control message to the UE. 2. The UE sends an event A3 measurement report to the MeNB. 3. The MeNB forwards the A3 measurement report to the SgNB. 4. The SgNB initiates a change request to the MeNB. 5. The MeNB sends a reconfiguration command to the UE, carrying the NR configuration. 6. The UE sends a reconfiguration completion message to the MeNB. 7. The MeNB forwards the reconfiguration completion message to the SgNB. 8. The UE sends a random access request to the SgNB. 1. NR A3 Measure Control The eNodeB transparently transmits the NR A3 measurement report.
  • 12. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 12 Process-Inter-SgNB Change UE MeNB 1. NR A3 Measure Control 2. NR A3 Measure Report 7. RRC CONN RECFG(NR Config) 8. RRC CONN RECFG CMP S-SgNB 9. SgNB Change Confirm MME 15. E-RAB Modification Indication 10. SgNB Reconfig CMP 16. E-RAB Modification Confirm 3. RRC Transfer (NR A3) 4. SgNB Change Required 5. SgNB Addition Request 6. SgNB Addition Request Acknowledge T-SgNB 12. SN Status Transfer 13. SN Status Transfer 1. The S-SgNB sends an A3 measurement control message to the UE. 2. The UE sends an A3 measurement report to the MeNB to report a stronger NR neighboring cell. 3. The MeNB forwards the measurement information to the S-SgNB. 4. The S-SgNB initiates an NR change request to the MeNB. 5. The MeNB sends an NR addition request to the T-SgNB. 6. The T-SgNB sends an NR addition acknowledge message to the MeNB. 7. The MeNB sends a reconfiguration message to the UE, carrying NR Config. 8. The UE sends a reconfiguration completion message to the MeNB. 9. The MeNB sends a reconfiguration confirmation message to the S-SgNB. 10. The MeNB sends a reconfiguration completion message to the T-SgNB. 11. The UE sends a random access request to the T-SgNB. 12. The S-SgNB sends an SN status transfer message to the MeNB (only when the RLC mode is AM). 13. The MeNB forwards the SN status transfer message to the T-SgNB (only when the RLC mode is AM). 14. The S-SgNB forwards data to the T-SgNB. 15. The MeNB sends a bearer change indication message to the core network. 16. The core network sends a bearer change confirmation message to the MeNB. 17. The MeNB sends a context release request to the S-SgNB. 17. UE Context Release 1. NR A3 Measure Control 14. Data Forwarding 11. Random Access
  • 13. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 13 Process-Intra-MeNB Handover UE MeNB 1. LTE A3/A4 Measure Control 2. LTE A3/A4 Measure Report 5. RRC CONN RECFG(LTE intra-eNB HO CMD) 7. RRC CONN RECFG CMP SgNB 3. SgNB Mod Req 4. SgNB Mod Req Ack 8. SgNB Reconfig CMP 6. Random Access 9. Random Access 1. The MeNB sends a measurement control message to the UE. 2. The UE sends a measurement report to the MeNB to report a stronger neighboring LTE cell. 3. When an LTE handover occurs and the key is changed, the MeNB sends a modification request to the SgNB, instructing the NR side to modify the PDCP key. 4. The SgNB sends a modification request acknowledge message to the MeNB. 5. The MeNB sends an LTE handover command to the UE, carrying the NR configuration. 6. The UE resends a random access request to the MeNB. 7. The UE sends a handover completion message to the MeNB. 8. The MeNB sends a reconfiguration completion message to the SgNB. 9. The UE sends a random access request to the SgNB. This process is always initiated by the Huawei MeNB and it is based on the normal intra- frequency and inter-frequency procedures used in LTE. It should be noted that in the current design the PSCell is not changed during the MeNB handover procedure
  • 14. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 14 Process-Inter-MeNB Handover UE S- eNB S-GW MME 1. LTE A3/A4 Measure Control 2. LTE A3/A4 Measure Report 3. HO Req 6. HO Req Ack 8. RRC CONN RECFG 10. RRC CONN RECFG CMP 13. Path Switch S- gNB 14. UE Context Rel 7. SgNB Rel Req 15. UE Context Rel T-eNB 5. SgNB Add Req ACK 4. SgNB Add Req 12. SgNB Recfg CMP 9. Random Access 11. Random Access 1. The S-eNB sends an LTE measurement control message to the UE. 2. The UE sends a measurement report to the S-eNB, indicating a stronger inter-eNodeB neighboring LTE cell. 3. The S-eNB sends a handover request to the T-eNB. 4. The T-eNB sends an addition request to the S-gNB. 5. The S-gNB sends an addition acknowledge message to the T-eNB. 6. The T-eNB sends a handover acknowledge message to the S-eNB. 7. The S-eNB sends a release request to the S-gNB. 8. The S-eNB sends an inter-eNodeB handover command to the UE. 9. The UE sends a random access request to the target cell. 10. The UE sends a handover completion message to the target LTE cell. 11. The UE sends a random access request to the S-gNB. 12. The T-eNB sends a reconfiguration completion message to the S-gNB. 13. The T-eNB sends a path switch message to the core network. 14. The T-eNB sends a context release request to the S-eNB. 15. The S-eNB sends a context release request to the S-gNB. Important Notes:- If the handover is from an MeNB to a Huawei eNB (that doesn’t support NSA DC), the SgNB is released before the MeNB handover is executed. If the handover is from an MeNB to a Samsung eNB, the SgNB is not released and 5G will be dropped after the handover. Handover to LTE800 will result in the SgNB being released since the 3UK strategy is to only enable anchoring on LTE1800 and LTE2100 cells.
  • 15. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 15 Process-SgNB Release The SgNB release (PSCell deletion) can be triggered by either:- 1. The Huawei MeNB due to SCG link faulty or packets lost; or 2. The SgNB due to A2 threshold, UE inactivity, X2 delay or packets lost. The coverage (A2) threshold is triggered if the PSCell RSRP decreases below a defined threshold: Note that the A2 time to trigger is fixed (not configurable) at 640ms 1. After receiving the A2 measurement report the SgNB sends an SgNB Release Required message to initiate an SgNB release procedure. 2. The MeNB sends an SgNB Release Confirm message to the SgNB to confirm that the SgNB is released. After receiving this message, the SgNB stops sending data to the UE. 3. NSA DC RRC disconnection is exactly the same as LTE RRC disconnection, so it is not covered in this document.
  • 16. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 16 Parameters to set on 4G sites to enable 5G mobility # Set PSCell addition B1 threshold and time to trigger MOD NRSCGFREQCONFIG: PccDlEarfcn=xxxx, ScgDlArfcn=*, ScgDlArfcnPriority=1, NsaDcB1ThldRsrp=-115, NrB1TimeToTrigger=512MS; # Point NSA DC UEs to the same mobility groups used by non-NSA DC UEs MOD CELLQCIPARA: LOCALCELLID=0, QCI=1, NsaDcInterFreqHoGroupId=0, NsaDcInterRatHoCommGroupId=0, NsaDcUtranHoGroupId=0, NsaDcIntraFreqHoGroupId=0; MOD CELLQCIPARA: LOCALCELLID=0, QCI=2, NsaDcInterFreqHoGroupId=0, NsaDcInterRatHoCommGroupId=0, NsaDcUtranHoGroupId=0, NsaDcIntraFreqHoGroupId=0; MOD CELLQCIPARA: LOCALCELLID=0, QCI=3, NsaDcInterFreqHoGroupId=0, NsaDcInterRatHoCommGroupId=0, NsaDcUtranHoGroupId=0, NsaDcIntraFreqHoGroupId=0; MOD CELLQCIPARA: LOCALCELLID=0, QCI=4, NsaDcInterFreqHoGroupId=0, NsaDcInterRatHoCommGroupId=0, NsaDcUtranHoGroupId=0, NsaDcIntraFreqHoGroupId=0; MOD CELLQCIPARA: LOCALCELLID=0, QCI=5, NsaDcInterFreqHoGroupId=1, NsaDcInterRatHoCommGroupId=1, NsaDcUtranHoGroupId=1, NsaDcIntraFreqHoGroupId=1; MOD CELLQCIPARA: LOCALCELLID=0, QCI=6, NsaDcInterFreqHoGroupId=1, NsaDcInterRatHoCommGroupId=1, NsaDcUtranHoGroupId=1, NsaDcIntraFreqHoGroupId=1; MOD CELLQCIPARA: LOCALCELLID=0, QCI=7, NsaDcInterFreqHoGroupId=1, NsaDcInterRatHoCommGroupId=1, NsaDcUtranHoGroupId=1, NsaDcIntraFreqHoGroupId=1; MOD CELLQCIPARA: LOCALCELLID=0, QCI=8, NsaDcInterFreqHoGroupId=1, NsaDcInterRatHoCommGroupId=1, NsaDcUtranHoGroupId=1, NsaDcIntraFreqHoGroupId=1; MOD CELLQCIPARA: LOCALCELLID=0, QCI=9, NsaDcInterFreqHoGroupId=1, NsaDcInterRatHoCommGroupId=1, NsaDcUtranHoGroupId=1, NsaDcIntraFreqHoGroupId=1;
  • 17. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 17 Parameters to set on 5G sites to enable Mobility # Define Intra-frequency handover group MOD NRCELLQCIBEARER: NrCellId=101, Qci=1, IntraFreqHoMeasGroupId=0; MOD NRCELLQCIBEARER: NrCellId=101, Qci=2, IntraFreqHoMeasGroupId=0; MOD NRCELLQCIBEARER: NrCellId=101, Qci=3, IntraFreqHoMeasGroupId=0; MOD NRCELLQCIBEARER: NrCellId=101, Qci=4, IntraFreqHoMeasGroupId=0; MOD NRCELLQCIBEARER: NrCellId=101, Qci=5, IntraFreqHoMeasGroupId=0; MOD NRCELLQCIBEARER: NrCellId=101, Qci=6, IntraFreqHoMeasGroupId=0; MOD NRCELLQCIBEARER: NrCellId=101, Qci=7, IntraFreqHoMeasGroupId=0; MOD NRCELLQCIBEARER: NrCellId=101, Qci=8, IntraFreqHoMeasGroupId=0; MOD NRCELLQCIBEARER: NrCellId=101, Qci=9, IntraFreqHoMeasGroupId=0; # Set Intra-frequency handover parameters MOD NRCELLINTRAFHOMEAGRP: NrCellId=101, IntraFreqHoMeasGroupId=0, IntraFreqHoA3Offset=2, IntraFreqHoA3Hyst=2, IntraFreqHoA3TimeToTrig=320MS; # Set filter coefficients for measurements MOD NRCELLMOBILITYCONFIG: NrCellId=101, BeamRsrpFilterCoeff=FC4, CellRsrpFilterCoeff=FC4; # Set coverage A2 threshold for PSCell removal MOD NRCellNsaDcConfig: NrCellId=101, PscellA2RsrpThld=-121;
  • 18. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 18 Main KPIs Formulas KPI name KPI formula Success rate of PCell change L.NsaDc.PCell.Change.Succ/L.NsaDc.PCell.Change.Exec x 100% SgNB addition success rate L.NsaDc.SgNB.Add.Succ/L.NsaDc.SgNB.Add.Att x 100% [SgNB addition success rate] ( [N.NsaDc.SgNB.Add.Succ] / [N.NsaDc.SgNB.Add.Att] )*{100} [Intra-SgNB PSCell change success rate] ( [N.NsaDc.IntraSgNB.PSCell.Change.Succ] / [N.NsaDc.IntraSgNB.PSCell.Change.Att] )*{100} [Inter-SgNB PSCell change success rate] ( [N.NsaDc.InterSgNB.PSCell.Change.Succ] / [N.NsaDc.InterSgNB.PSCell.Change.Att] )*{100} NR drop rate ( [N.NsaDc.SgNB.AbnormRel] / [N.NsaDc.SgNB.Rel] )*{100} User Downlink Average Throughput(NR) User Downlink Average Throughput(NR) = (N.ThpVol.DL - N.ThpVol.DL.LastSlot) / N.ThpTime.DL.RmvLastSlot User Uplink Average Throughput(NR) User Uplink Average Throughput(NR) = (N.ThpVol.UL- N.ThpVol.UE.UL.SmallPkt) / N.ThpTime.UE.UL.RmvSmallPkt Cell Downlink Average Throughput Cell Downlink Average Throughput = N.ThpVol.DL.Cell / N.ThpTime.DL.Cell Cell Uplink Average Throughput Cell Uplink Average Throughput = N.ThpVol.UL.Cell / N.ThpTime.UL.Cell Downlink Resource Block Utilizing Rate Downlink Resource Block Utilizing Rate =(N.PRB.DL.Used.Avg/N.PRB.DL.Avail.Avg)× 100% Uplink Resource Block Utilizing Rate Uplink Resource Block Utilizing Rate =(N.PRB.UL.Used.Avg/N.PRB.UL.Avail.Avg)× 100% Radio Network Unavailability Rate Radio Network Unavailability Rate =( [N.Cell.Unavail.Dur.System.Avg] + [N.Cell.Unavail.Dur.Manual.Avg] )/({GP}*{60})*100 Downlink Traffic Volume Downlink Traffic Volume =N.ThpVol.DL Uplink Traffic Volume Uplink Traffic Volume = N.ThpVol.UL Average User Number NSA: Average User Number =N.User.RRCConn.Avg [DRB setup success rate] ( [N.NsaDc.DRB.Add.Succ] / [N.NsaDc.DRB.Add.Att] )*{100}
  • 19. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 19 LTE Counter- NSA DC Counters Counter ID Counter Name Counter Description 1526747851 L.NsaDc.SgNB.Add.Att Total number of SgNB addition attempts for UEs that treat the local cell as their PCell in the LTE-NR NSA DC state 1526747852 L.NsaDc.SgNB.Add.Succ Total number of successful SgNB additions for UEs that treat the local cell as their PCell in the LTE-NR NSA DC state 1526747853 L.NsaDc.SCG.Change.Att Total number of SCG change attempts for UEs that treat the local cell as their PCell in the LTE-NR NSA DC state 1526747854 L.NsaDc.SCG.Change.Succ Total number of successful SCG changes for UEs that treat the local cell as their PCell in the LTE-NR NSA DC state 1526747855 L.NsaDc.SgNB.Rmv.Att Total number of SgNB removal attempts for UEs that treat the local cell as their PCell in the LTE-NR NSA DC state 1526747856 L.NsaDc.ScgFailure Total number of SCG-related failures for UEs that treat the local cell as their PCell in the LTE-NR NSA DC state 1526748735 L.NsaDc.PCell.Change.Exec Number of PCell change executions in LTE-NR NSA DC scenarios 1526748736 L.NsaDc.PCell.Change.Succ Number of successful PCell changes in LTE-NR NSA DC scenarios 1526748737 L.NsaDc.E-RAB.AbnormRel Total number of abnormal E-RAB releases in LTE-NR NSA DC scenarios 1526748825 L.NsaDc.SCG.Mod.Req.Att Number of SCG modification attempts for UEs that treat the local cell as their PCell in the LTE-NR NSA DC state 1526748826 L.NsaDc.SCG.Mod.Req.Succ Number of successful SCG modifications for UEs that treat the local cell as their PCell in the LTE-NR NSA DC state 1526748827 L.NsaDc.SCG.Mod.Required.Att Number of SCG modification attempts received by UEs in the LTE-NR NSA DC state in a cell 1526748828 L.NsaDc.SCG.Mod.Required.Succ Number of successful SCG modifications received by UEs in the LTE-NR NSA DC state in a cell 1526748829 L.NsaDc.E-RAB.Mod.Ind.Att Number of E-RAB modification attempts initiated by UEs in the LTE-NR NSA DC state in a cell 1526748830 L.NsaDc.E-RAB.Mod.Ind.Succ Number of successful E-RAB modifications initiated by UEs in the LTE-NR NSA DC state in a cell 1526755742 L.NsaDc.E-RAB.NormRel Total number of normal E-RAB releases for NSA DC UEs 1526755743 L.NsaDc.HHO.PrepAttOut Number of outgoing handover preparation attempts for NSA DC UEs 1526755744 L.NsaDc.HHO.ExecAttOut Number of outgoing handover executions for NSA DC UEs 1526755745 L.NsaDc.HHO.ExecSuccOut Number of successful outgoing handovers for NSA DC UEs
  • 20. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 20 5G Counters- NSA DC Measurements Counter ID Counter Name Counter Description 1911816746 N.NsaDc.SgNB.Add.Att Number of SgNB addition requests in the LTE-NR NSA DC scenario 1911816747 N.NsaDc.SgNB.Add.Succ Number of successful SgNB additions in the LTE-NR NSA DC scenario 1911816748 N.NsaDc.InterSgNB.PSCell.Change.Att Number of inter-SgNB PSCell change requests in the LTE-NR NSA DC scenario 1911816749 N.NsaDc.InterSgNB.PSCell.Change.Succ Number of successful inter-SgNB PSCell changes in the LTE-NR NSA DC scenario 1911816750 N.NsaDc.IntraSgNB.PSCell.Change.Att Number of intra-SgNB PSCell change requests in the LTE-NR NSA DC scenario 1911816751 N.NsaDc.IntraSgNB.PSCell.Change.Succ Number of successful intra-SgNB PSCell changes in the LTE-NR NSA DC scenario 1911816752 N.NsaDc.SgNB.Rel Total number of SgNB releases in the LTE-NR NSA DC scenario 1911816753 N.NsaDc.SgNB.AbnormRel.Radio Total number of abnormal SgNB releases in the LTE-NR NSA DC scenarios caused by radio layer issues 1911816754 N.NsaDc.DRB.Add.Att Number of DRB addition requests for LTE-NR NSA DC UEs on the SgNB 1911816755 N.NsaDc.DRB.Add.Succ Number of successful DRB additions for LTE-NR NSA DC UEs on the SgNB 1911816756 N.NsaDc.DRB.Rel Number of DRB releases for LTE-NR NSA DC UEs on the SgNB 1911816757 N.NsaDc.DRB.AbnormRel Number of abnormal DRB releases for LTE-NR NSA DC UEs on the SgNB 1911816836 N.NsaDc.SgNB.AbnormRel.Radio.SUL Total number of abnormal SgNB releases in the LTE-NR NSA DC scenarios caused by radio layer issues of the SUL 1911816843 N.NsaDc.SgNB.Rel.Coverage Number of coverage-based SgNB releases in LTE-NR NSA DC scenarios 1911817841 N.NsaDc.SgNB.Rel.SgNBTrigger Total number of SgNB releases triggered by SgNB in LTE-NR NSA DC scenarios 1911817842 N.NsaDc.SgNB.AbnormRel.Trans Total Number of abnormal SgNB releases due to the transport layer in LTE-NR NSA DC scenarios 1911817843 N.NsaDc.SgNB.AbnormRel Total number of abnormal SgNB releases triggered by SgNB in LTE-NR NSA DC scenarios 1911817848 N.NsaDc.IntraSgNB.PSCell.Change.Fail.Conflict Number of intra-SgNB PSCell change failures caused by procedure conflicts in LTE-NR NSA DC scenarios 1911817849 N.NsaDc.InterSgNB.PSCell.Change.Fail.Conflict Number of inter-SgNB PSCell change failures caused by procedure conflicts in LTE-NR NSA DC scenarios 1911817850 N.NsaDc.SgNB.Mod.Req.Fail.Radio Number of failures of SgNB modifications initiated by the MeNB due to radio faults in LTE-NR NSA DC scenarios 1911817851 N.NsaDc.SgNB.Mod.Req.Fail.TNL Number of failures of SgNB modifications initiated by the MeNB due to transmission faults in LTE-NR NSA DC scenarios 1911817852 N.NsaDc.SgNB.Mod.Req.Succ Number of successful SgNB modifications initiated by the MeNB in LTE-NR NSA DC scenarios 1911817853 N.NsaDc.SgNB.Mod.Req.Att Number of SgNB modification attempts initiated by the MeNB in LTE-NR NSA DC scenarios 1911817854 N.NsaDc.SgNB.Add.Fail.Radio Number of SgNB addition failures caused by radio faults in LTE-NR NSA DC scenarios 1911817855 N.NsaDc.SgNB.Add.Fail.Radio.NoRes Number of SgNB addition failures caused by the unavailability of radio resources in LTE-NR NSA DC scenarios 1911817856 N.NsaDc.SgNB.Add.Fail.TNL Number of SgNB addition failures caused by transmission faults in LTE-NR NSA DC scenarios 1911817857 N.NsaDc.SgNB.AbnormRel.Radio.UeLost Number of abnormal SgNB releases initiated by the SgNB caused by UE LOST 1911817858 N.NsaDc.SgNB.AbnormRel.NoReply Number of abnormal SgNB releases initiated by the SgNB caused by no response
  • 21. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 21 5G NR – Inter-SgNB PSCell Change SR [BXXXXX] BYYYYY OA @ 27th Feb 2020 Summary:-  From SON log analysis, X2 interface wasn’t established earlier although neighbor external cell has been defined due to maximum x2 interface(384) reached for this site.  X2 interface between Site BXXXXX and BYYYYY was established on 3rd March 2020; issue resolved after X2 interface between gNB created. 1.17k m 3843 11869 Analysis:- From trace found out the SGNB_Change_Refuse due to failure of “Transport-resource-unvailable”
  • 22. HISILICON SEMICONDUCTOR HUAWEI TECHNOLOGIES CO., LTD. Page 22 5G NR – [Analysis] Inter-SgNB Change SR From MAN101 BRD, main inter-SgNB change failure due to “X2_SGNB_CHANGE_REFUSE/TRANSP_RSRC_UNAVAILABLE_CAU SE_TRANSP” MAN004 LTE X2 interface MAN004 (615) MAN101 (751) MAN101 (751) MAN004 (615) MAN101 LTE X2 interface From BRD of MAN101, main failure due to “X2_SGNB_CHANGE_REFUSE/TRANS P_RSRC_UNAVAILABLE_CAUSE_TR ANSP “; further check found MAN004 and MAN101 X2 are facing SCTP link issue; which suspect causing the failures on inter-SgNB change. Issue normalizing after 28th March.
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