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566204064-SRAN13-1-15-0-NSA-Networking-Based-on-EPC-20180905.pptx

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RajeshKumarSubramani5

The document discusses NSA networking based on EPC, including: - NSA standard planning which introduced NSA in 2017 and enhanced it in 2018. - LTE+NR DC deployment scenarios including NSA with EPC (EN-DC) and 5GC (NGEN-DC, NE-DC). - Key concepts such as MR-DC, MeNB, SgNB, PCell, PSCell, SCell. - Functions of EN-DC including carrier management between LTE (MeNB) and NR (SgNB), data split between LTE and NR layers, and uplink power configuration.

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HUAWEI TECHNOLOGIES CO., LTD. www.huawei.com Huawei Confidential Security Level: 2024/1/4 SRAN15.0 NSA Networking based on EPC
HUAWEI TECHNOLOGIES CO., LTD. Objectives  After completing this course, you will be able to understand the basic principles, application scenarios, and specifications of the NSA Networking based on EPC feature, and be able to site-design, configure, commission, and verify the feature by referring to related documents.
HUAWEI TECHNOLOGIES CO., LTD. Page 3 NSA Standard Planning and Functions  NSA: Completed the NSA standard architecture in December 2017, froze procedures and messages in March 2018, and specified message IEs in June 2018. LTE-A Pro 2016 5G New RAT Rel-15 2017 2018 2019 5G Phase 1.1 5G Phase 1.2 5G Phase 2 Rel-16 Rel-14 NR NSA (non-independent RAT) NR SA (independent RAT) Full-IMT2020 NR • Definitions of NGCN and NR NSA, SA architecture (eMBB/URLLC) • Full 5G standard and mMTC capability definition • Enhanced capability definition: Soft AI/D2D/D-TDD/Flexible Duplex • NSA definition, eMBB • Numerology, frame structure • Native M-MIMO & waveform • eMBB • URLLC • mMTC  SRAN13.1 is the first version of NSA Networking based on EPC. In SRAN15.0, interference coordination is added and mobility management is enhanced.  Carrier management  Mobility management  Data split (UL/DL)  Uplink power control  eNodeB and gNodeB interconnection modes  Interference coordination between LTE and NR NR service objectives Expected in 2019 H2 Launch of NSA terminals
HUAWEI TECHNOLOGIES CO., LTD. Page 4 LTE+NR DC Deployment Scenarios LTE Anchor, EPC eLTE Anchor, New Core NR Anchor, New Core Option 3 [18B/19A] S1 X2 NR Non-Standalone EPC NC LTE NR EPC NC LTE X2 EPC NC LTE NR Option 3a Option 3X [18B/19A] S1 S1 EPC NR EPC NR NC NC Option 7 Option 7a eLTE EPC NC NR eLTE Option 4 S1-U EPC NC NR eLTE Option 4a eLTE S1-U Ng Xn Ng Ng-U NR Standalone X2-C NR Legend User Plane Control Plane Phase 1.1 Phase 1.2 (new core) Note: Option 2/5 is NR/eLTE standalone. For LTE- NR DC, Huawei currently focuses on Option 3/3x NSA deployment. EPC NR NC Option 7X eLTE Ng Xn Xn-C Ng-U 5G NSA gNodeBs will support 5G SA without any hardware changes. EN-DC NGEN-DC NE-DC in option 3x, S1-U with LTE only used for LTE bearer setup and GBR service. No data transferred.
HUAWEI TECHNOLOGIES CO., LTD. Page 5 DC Related Concepts MR-DC category Specific Scenario Full Name Core network MN SN Option MR-DC with EPC EN-DC E-UTRA-NR Dual Connectivity EPC LTE NR 3/3a/3x MR-DC with 5GC NGEN- DC NG-RAN E- UTRA-NR Dual Connectivity 5GC eLTE NR 7/7a/7x NE-DC NR-E-UTRA Dual Connectivity 5GC NR eLTE 4/4a DC (Dual-Cell): Two carriers are bundled to implement a technology that doubles the rate of a single carrier. like DC-HSDPA+ in UMTS. This DC(Dual-Cell) is not the one described in this document. DC（Dual Connection）：Indicates the operation mode of the UE in RRC connected mode. The UE is configured with a primary cell combination and a secondary cell group. The "DC" in the document indicates the LTE DC. MR-DC ：Multi-RAT Dual Connectivity. Including EN-DC, NE-DC, and NGEN-DC. MeNB：Master eNB, the eNB with S1-MME interface in the DC. SgNB：Secondary gNodeB, the NR site configured by the MeNB through RRC connection signaling for the NSA DC terminal. In 18B and 19A, only the NR site can be set to the SgNB. Pcell：Primary Cell. Primary cell of the MeNB, which cell the NSA DC terminal camps on. PSCell：Primary Secondary Cell: The primary cell of the SgNB which is configured by the MeNB using RRC connection signaling for NSA DC user. The PSCell is in the activated state once PSCELL is configured successfully. Scell：Secondary Cell, a secondary cell configured by the MeNB. It works on the SCC, which can provide more radio resources for the NSA DC terminal. Cell Group：A group of serving cells on the MeNB or the SeNB In the DC. MCG：Master Cell Group. A cell group on the MeNB has one Pcell and one or more SCells. SCG：Secondary Cell Group. In the DC, the serving cell is only related to the SgNB, and has one PSCell and one or more optional SCells. 3GPP 36300-R14
HUAWEI TECHNOLOGIES CO., LTD. Contents  Functions and Principles • EN-DC Carrier Management • EN-DC Data Split • EN-DC Uplink Power Configuration  Feature Planning  Feature Installation and Commissioning  Feature Acceptance and Maintenance
HUAWEI TECHNOLOGIES CO., LTD. Page 7 EN-DC Carrier Management • The eNodeB is MeNB, and the gNodeB is SgNB. • EN-DC specifications: 1 MeNB+1 SgNB • Intra-RAT CA specifications: DL: LTE support 5CC, NR support 2CC(Only intra-band CA were supported in NR side). UL: LTE 1CC, NR C-BAND 2CC(Only intra-RAT CA were supported in NR side)  NSA networking based on EPC  MeNB carrier management • PCC anchor selection(for UE in RRC_CONNECTED status, RRC_IDLE status, duplex- mode-priority-based PCC anchoring selection, and load-based PCC anchoring selection) • SCC carrier management (SCell configuration, SCell change, enhanced SCell selection, SCell activation, SCell deactivation, and SCell removal) The MeNB carrier management is identical with LTE carrier management. For details, see <LTE Carrier Aggregation Feature Parameter Description>.  SgNB carrier management (only PSCell configuration) • Triggering conditions of PSCell configuration: 1. The MeNB PCC anchoring procedure is complete. 2. The UE supports NR. 3. The one-way transmission delay between the MeNB and SgNB is less than 60ms (20ms for better performance). • PSCell Configuration Procedure Step 1: The MeNB fills and delivers an SCG measurement control message. The MeNB delivers the NR measurement control to the UE. Direct signaling interaction between the gNodeB and the UE is not supported. Step 2: GAP-assisted measurement control is performed. When a UE needs to measure the quality of inter-frequency channels, GAP- assisted measurement needs to be started. Step 3: The UE sends an event B1 measurement report to the MeNB. Step 4: After receiving the measurement report, the MeNB decides to trigger an SgNB Addition (PSCell configuration) procedure. If multiple cells are reported in the measurement report, the MeNB adds the strongest RSRP cell of SgNB reported in the measurement report. CC1 CC2 CC3 CC4 CC5 3.5G LTE NR DC 3.5G LTE 5CC + NR 2CC Please show the corresponding NE: MN, SN; MCG, SCG; Pcell, Pscell, Scell;
HUAWEI TECHNOLOGIES CO., LTD. Page 8 SgNB Addition Procedure 3GPP.TS.37.3400
HUAWEI TECHNOLOGIES CO., LTD. Page 9 EN-DC Data Split MeNB (LTE) PDCPLTE RLCLTE MACLTE SgNB (NR) PDCPNR RLCNR MACNR S1-U X2 RLCLTE MeNB (LTE) PDCPLTE RLCLTE MACLTE SgNB (NR) PDCPNR RLCNR MACNR S1-U X2 RLCLTE Data split at LTE PDCP layer MCG Split Bearer:  Downlink data split architecture  Parameter settings for downlink data split SGW MCG Split Bear SCG Split Bear 1. The MAC/RLC entities of the master or secondary base stations corresponding to the UE are independent. 2. Uplink data scheduling and BSR reporting are independent. 3. On the UE side, the PDCP entity is shared by NR and LTE. 4. The UE performs uplink data split according to the configuration command delivered by the master base station. MAC MAC RLC RLC PDCP UE Split bearer MeNB/MgNB SgNB/SeNB BSR+Data BSR+Data Configuration  Uplink data split architecture LTE parameter NR CQI level parameter NsaDcDefaultBearerMode NsaDcUeMcgUlAmbrRatio UlDataSplitPrimaryPath UlDataSplitThreshold UlDataSplitThreshold Data split at NR PDCP layer SCG Split Bearer:
HUAWEI TECHNOLOGIES CO., LTD. Page 10 Typical scenario parameter setting Solution: 1. Data distribution to the PDCP anchor is preferred. 2. The X2 transmission delay and LTE/NR RLC buffer delay are supplemented. 3. Packets are sent in turn based on the ratio of the RLC perceived rate.  Dynamic data split solution (gNB PDCP split as example)  The 5G gNB PDCP layer distributes data to the LTE RLC and NR RLC layers by packet. 5G uplink and downlink balance area 5G uplink restricted area Downlink data carried on 5G Uplink data carried on 4G 4G coverage  NR UL/DL Separation  NR CP/UP Separation UE eNodeB gNodeB Parameter Dynamic data split NR UL/DL Separation NR CP/UP Separation DlDataPdcpSplitMode SCG_AND_MCG SCG_ONLY SCG_ONLY UlDataSplitPrimaryPath SCG MCG SCG UlDataSplitThreshold BIT0 Infinity Infinity For Insufficient NR uplink coverage scenario. Static configuration: UL data transmitted on LTE, and DL data transmitted on NR. • CP data carried on LTE, UP data carried on NR • NR can provide high capacity/throughput by large bandwidth. • LTE provide mobility, and handovers can be performed without any interruptions.  Typical scenario parameter setting (Option 3X as example) • Actual RLC buffer • Traffic of PDCP PDUs received by RLC • User-perceived RLC rate Reporting period: 100 ms DL Data Delivery Status [10 ms]: • Actual RLC buffer [100 ms] • Traffic of PDCP PDUs received by RLC [100 ms] • User-perceived RLC rate [100 ms] Distributed data Status feedback
HUAWEI TECHNOLOGIES CO., LTD. Page 11 EN-DC Uplink Power Configuration  Uplink power configuration • A proper proportion of the UE power is allocated between LTE and NR to ensure the transmission of uplink data and signaling of the UE. • Power configuration parameters (controlled on the LTE side)-19A NsaDcUeMcgUlMaximumPower (NSA DC UE MCG uplink maximum power) NsaDcUeScgUlMaximumPower (NSA DC UE SCG uplink maximum power) • Power configuration According to 3GPP specifications, the maximum uplink transmit power of NSA UEs is 23 dBm. This version supports only power control in semi-persistent scheduling. Currently, the uplink TDM power control mode and dynamic power sharing mode are not supported. Therefore, the following configuration is recommended: NsaDcUeMcgUlMaximumPower=NsaDcUeScgUlMaximumPower=20dBm
HUAWEI TECHNOLOGIES CO., LTD. EN-DC Interference Avoidance  Solutions • Cross-modulation interference avoidance solution Subframe-level TDM: After LTE-NR subframes are aligned, LTE and NR uplink subframes are scheduled at different time. • X2 interface message in the avoidance solution The frequency information and graph structure are transmitted according to 3GPP X2 interface standard messages.  Scenario Analysis • Cross-modulation interference: LTE-NR uplink concurrency produces cross-modulation interference, affecting LTE downlink reception. • Harmonic interference: LTE uplink secondary harmonic interferes NR downlink reception. Cross-modulation interference Harmonic interference  Customer Benefits • Cross-modulation interference avoidance: LTE common channels are not affected (ensuring UE mobility). Single-user downlink performance improves by 30%. • Harmonic interference avoidance: NR common channels are not affected (ensuring UE mobility). NR S subframes are used for SRS or PRACH transmission, the proportion of UpPTS is small (about 0.07 ms), and LTE U subframes and NR S subframes can be transmitted simultaneously. • Secondary harmonic interference avoidance solution LTE channels are yielded to NR common channels (PBCH/PSS/SSS and common PDCCH) in scheduling. Slot PRB Time-frequency positions of NR common channels LTE channels are yielded to NR common channels in uplink scheduling (converted to the frequency range that generates secondary harmonic interference).
HUAWEI TECHNOLOGIES CO., LTD. Page 13 X2 Interface Management MME eNodeB gNodeB SGW S1-C S1-U S1-U X2-C X2-U EN-DC X2 self-management includes the following functions:  X2 Self-Setup The eNodeB sets up EN-DC services to trigger X2 self-setup. X2 self-setup involves manual configuration of the peer IP addresses and automatic configuration of the peer IP addresses. Currently, only X2 self-setup over U2020 is supported, and the eNodeB and gNodeB must be managed by the same U2020.  X2 Self-Update During network operation, the IP address or operator information (MNC, MCC, or Global eNodeB ID) of the peer eNodeB may be modified. When the X2 interface is faulty, the X2 self- setup procedure is triggered again.  X2 Self-Removal The eNodeB proactively releases the X2-U links that are not used or disconnected for a long time. In the EN-DC architecture, the eNodeB/gNodeB supports only the configuration of the X2/S1-U interface in the endpoint configuration mode. • The logical interface between the eNodeB and the gNodeB is the X2 interface. The X2 interface includes the X2 interface on the control plane (X2-C) and X2 interface on the user plane (X2-U). The X2 control plane is based on the SCTP (Stream Control Transmission Protocol) and the user plane is based on the GTP-U (GPRS Tunneling Protocol-User Plane). • The user-plane interface between the gNodeB and the S-GW is S1-U. S1-U is based on the GTP-U. In the Option 3X architecture, the S1-U interface between the gNodeB and S-GW must be configured. S1-U self-setup S1-U self-setup between the gNodeB and S-GW is implemented only in the Option 3X architecture and not in the Option 3 architecture.
HUAWEI TECHNOLOGIES CO., LTD. Contents  Functions and Principles  Feature Planning  Feature Installation and Commissioning  O&M and Performance Counters
HUAWEI TECHNOLOGIES CO., LTD. Page 17 Version/License Planning  Version Positioning 1. In 18B and 19A, NSA Networking based on EPC is a basic function of 5G NSA networking. 2. NSA Networking based on EPC is a multi-mode basic feature. It is not sold independently and no license is planned.  Feature Names and IDs 00 FDD Multi-mode Basic Features 00 TDD Multi-mode Basic Features 00 NR Multi-mode Basic Features MRFD-131122 MRFD-131132 MRFD-131162 NSA Networking based on EPC (LTE FDD) NSA Networking based on EPC (LTE TDD) NSA Networking based on EPC (NR) 00 FDD Multi-mode Basic Features 00 TDD Multi-mode Basic Features 00 NR Multi-mode Basic Features MRFD-131121 MRFD-131131 MRFD-131161 LTE and NR X2 Interface Self-Configuration (LTE FDD) LTE and NR X2 Interface Self-Configuration (LTE TDD) LTE and NR X2 Interface Self-Configuration (NR)
HUAWEI TECHNOLOGIES CO., LTD. Page 18 DC scenario selection & data split configuration Installation and Commissioning-Feature Activation and Data Split Mode Configuration NE Feature MML Command Parameter ID Parameter Name Default Value Recommended Value MOD NRCellAlgoSwitch NsaDcSwitch NSA DC switch ON ON DlDataScgSplitBearerMode Downlink Data SCG Split Bearer Mode SCG_AND_MCG SCG_ONLY UlDataSplitPrimaryPath Uplink Data Split Primary Path MCG SCG UlDataSplitThreshold UL Data Split Threshold BYTE200 BYTE0 MOD eNodeBAlgoSwitch CaAlgoSwitch CA Algorithm Switch OFF FreqCfgSwitch-1 PccDlEarfcn PCC Downlink EARFCN None Keep current value if exist PreferredPccPriority Preferred PCC Priority 0 Keep current value if exist PccA4RsrpThd PCC A4 RSRP Threshold -105 Keep current value if exist PccA4RsrqThd PCC A4 RSRQ Threshold -20 Keep current value if exist PccDlEarfcn PCC DL EARFCN None LTE DL EARFCN ScgDlArfcn SCG DL ARFCN None NR DL NARFCN ScgDlArfcnPriority SCG DL ARFCN Priority None Refer to Planning Result NsaDcB1ThldRsrp NSA DC B1 Event RSRP Threshold -105 -105 NsaDcAlgoSwitch NSA DC Algorithm Switch OFF NSA_DC_CAPABILITY_SWITCH-1 NsaDcDefaultBearerMode NSA DC Default Bearer Mode SCG_SPLIT_BEARER SCG_SPLIT_BEARER NsaDcUeMcgUlAmbrRatio NSA DC User MCG UL AMBR Ratio 50% 0.3 NsaDcUeMcgUlPowerRate NSA DC UE MCG UL Power Rate 9 9 NsaDcUeScgUlPowerRate NSA DC UE SCG UL Power Rate 9 9 MOD UECOOPERATIONPARA SpecUserCooperationSwitch Identify specific UEs SpecUeIdentifySwitch:Off SpecUeIdentifySwitch-1 MOD CELL DlBandWidth Downlink Bandwidth None CELL_BW_N50 DlArfcn Downlink ARFCN None NR DL NARFCN UlArfcnConfigInd Uplink ARFCN Configuration Indicator NOT_CFG NOT_CFG Mcc Mobile Country Code None Refer to Actual information. Mnc Mobile Network Code None Refer to Actual information. gNodebId gNodeB ID None Refer to Planning Result CellId Cell ID None Refer to Planning Result DlArfcn Downlink ARFCN None NR DL NARFCN UlArfcnConfigInd Uplink ARFCN Configuration Indicator None NOT_CFG PhyCellId Physical Cell ID None Refer to Planning Result Tac Tracking Area Code None Refer to Planning Result Mcc Mobile Country Code None Refer to Planning Result Mnc Mobile Network Code None Refer to Planning Result gNodebId gNodeB ID None Refer to Planning Result CellId Cell ID None Refer to Planning Result MOD NRCellNsaDcConfig NR gNodeB MRFD-131162 NSA Networking based on EPC (5G NR) MOD NsaDcMgmtConfig ADD NRNFREQ ADD NREXTERNALCELL ADD NRNRELATIONSHIP ADD NrScgFreqConfig ADD PCCFREQCFG (Keep current value if exist, don't modify) MRFD-131122 NSA Networking based on EPC (LTE FDD) LTE eNodeB Sample: 18B Option3x LTE -> NR Neighbor LTE parameter NR parameter
HUAWEI TECHNOLOGIES CO., LTD. Page 19 Installation and Commissioning-Feature Activation and Data Split Mode Configuration Sample: 19A Option3x LTE -> NR Neighbor LTE parameter NR parameter DC scenario selection & data split configuration CQI level parameter
HUAWEI TECHNOLOGIES CO., LTD. Activation Evaluation  LTE Traffic Statistics  NR Traffic Statistics Counter Name Counter Description L.Traffic.User.NsaDc.PCell.Avg Average number of UEs that treat the local cell as their PCell in the LTE-NR NSA DC state L.Thpt.bits.DL.McgSplit.MeNB Total traffic volume offloaded from UEs in the PCell at the PDCP layer to the MeNB during LTE-NR NSA DC 3C offloading L.Thpt.bits.DL.McgSplit.SgNB Total traffic volume offloaded from UEs in the PCell at the PDCP layer to the SgNB during LTE-NR NSA DC 3C offloading L.Thpt.bits.UL.McgSplit.MeNB Total uplink MeNB traffic volume received by UEs in the PCell from the PDCP layer of the MeNB during LTE-NR NSA DC 3C offloading L.Thpt.bits.UL.McgSplit.SgNB Total uplink SgNB traffic volume received by UEs in the PCell from the PDCP layer of the MeNB during LTE-NR NSA DC 3C offloading 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 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 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 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 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 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 Counter Name Counter Description N.User.NsaDc.PSCell.Avg Average number of LTE-NR NSA DC UEs using the current cell as PSCell N.NsaDc.SgNB.Add.Att Number of SgNB addition requests in the LTE-NR NSA DC scenario N.NsaDc.SgNB.Add.Succ Number of successful SgNB additions in the LTE-NR NSA DC scenario N.NsaDc.InterSgNB.PSCell.Change.Att Number of inter-SgNB PSCell change requests in the LTE-NR NSA DC scenario N.NsaDc.InterSgNB.PSCell.Change.Succ Number of successful inter-SgNB PSCell changes in the LTE-NR NSA DC scenario N.NsaDc.IntraSgNB.PSCell.Change.Att Number of intra-SgNB PSCell change requests in the LTE-NR NSA DC scenario N.NsaDc.IntraSgNB.PSCell.Change.Succ Number of successful intra-SgNB PSCell changes in the LTE-NR NSA DC scenario N.NsaDc.SgNB.Rel Total number of SgNB releases in the LTE-NR NSA DC scenario N.NsaDc.SgNB.AbnormRel Number of abnormal SgNB releases in the LTE-NR NSA DC scenario N.NsaDc.DRB.Add.Att Number of DRB addition requests for LTE-NR NSA DC UEs on the SgNB N.NsaDc.DRB.Add.Succ Number of successful DRB additions for LTE-NR NSA DC UEs on the SgNB N.NsaDc.DRB.Rel Number of DRB releases for LTE-NR NSA DC UEs on the SgNB N.NsaDc.DRB.AbnormRel Number of abnormal DRB releases for LTE-NR NSA DC UEs on the SgNB N.PDCP.DL.X2U.TrfPDU.TxPackets Number of downlink PDCP PDUs transmitted over the X2 interface in a cell N.PDCP.UL.X2U.TrfPDU.RxPackets Number of uplink PDCP PDUs received over the X2 interface in a cell N.PDCP.Vol.DL.X2U.TrfPDU.Tx Traffic of downlink PDCP PDUs transmitted over the X2 interface in a cell N.PDCP.Vol.UL.X2U.TrfPDU.Rx Traffic of uplink PDCP PDUs received over the X2 interface in a cell
HUAWEI TECHNOLOGIES CO., LTD. Page 21 Examples of Signaling Tracing LTE Uu interface tracing (event B1 measurement of NR delivered by the eNodeB) S1 interface tracing (E-RAB path change in the Option 3X architecture) L-NR X2 interface tracing (the eNodeB sends an SgNB addition request) E-RAB path change
HUAWEI TECHNOLOGIES CO., LTD. Page 22 NSA DC Deployment on the Live Network New RAN OSS New CN OSS NG Core AAU (NR 3.5G) RRU(TDD1900) RRU(TDD2600) ③ New direct-connected 100G CPRI optical cable BBU5900 (NR) BBU39X0(LTE) ④ New BBU5900 ⑥ Transmission bandwidth: 8.5 Gbit/s (peak bandwidth of a single cell) 16.5 Gbit/s (peak bandwidth of three cells) GPS ⑤ Added GPS/BeiDou divider and cables CPE Terminal Antenna RRU and CPRI BBU Transmission and clock Core network NMS ② Added NR 3.5 GHz AAU Divider ⑦ NG Core ⑧ New PLMN (5G) ⑨ Added RAN OSS ⑧ Added CN OSS 5G TUE 4G TUE XGE electrical interface interconnection E2E networking
HUAWEI TECHNOLOGIES CO., LTD. UE Access network Policy Overview gNodeB Anchor eNodeB 5G-Uu NSA UE Transport Network RAN Network MME/SGSN S-GW/P-GW/GGSN MME/SGSN S-GW/P-GW/GGSN Core Network Existing EPC New EPC+ 4G only UE 4G-Uu UE Access Anchor UE Access Core Network Purpose: Purpose: Optional UE access anchor policy: Optional UE access CN policy: NSA UE and 4G only UE access control at RAN 1. NSA UE can be accessed only at anchor 2. Whether 4G only UE can access anchor 1. Multi-PLMN access control a) Combining MOCN Policies b) 5M LTE Dedicated Carrier realize isolation. 2. Single PLMN access control: a) reserved cell of the operator + AC level control b) Select NSA Terminal by TAC+IMSI NSA UE and 4G only UE core network access control at CN 1. NSA UE can only select EPC+ 2. Whether 4G only UE can be controlled by EPC+ 1. Décor (19A support) 2. MOCN 3. Fixed GUMMEI by Msg5+S1 flex (Not recommended. Need R&D engineers support, if it’s required.) 4. Use 5M LTE dedicated network, select the corresponding CN based on the UE access anchor control policy. UE access network policy involve UE access anchor policy and UE access core network policy. Material & Video Release Link
HUAWEI TECHNOLOGIES CO., LTD. MME Selection Based on DECOR (DCN) in 19A The NAS message redirection procedure is as follows: 1. Upon the access of a UE, the eNodeB selects an MME for the UE based on access information and sends an Initial UE Message to the MME. 2. If an NSA UE accesses the MME (old) or an LTE-only UE (including a non-subscription NSA-capable UE) accesses the MME (new), it triggers an NAS message redirection procedure by sending a Reroute NAS Request message to the eNodeB. This message contains the following IEs: - original RAN message, which is a complete packet data unit (PDU) received from the RAN. It contains the original NAS request message and all RAN IEs. - MME Group ID, which determines the next serving DCN. - Additional GUTI, which helps the eNodeB to select an MME. - UE Usage Type, which is optional. Its value is specified upon UE subscription and sent by the eNodeB to the next MME. 3. The eNodeB selects a new MME based on the IEs MME Group ID and Additional GUTI carried in the Reroute NAS Request message. 4. The eNodeB sends an Initial UE Message to the newly selected MME. This message contains the IEs MME Group ID and UE Usage Type (which is available only if it is contained in the Reroute NAS Request message). Based on the IE MME Group ID, the new MME determines that this is an Initial UE Message sent after a triggered redirection. Therefore, the MME does not forward this message but processes or rejects it. LTE UE eNodeB MME (new) MME (old) RRC Connection Setup Initial UE Message Reroute NAS Request, including GUTI Select the old MME based on GUMMI in GUTI The MME identifies the LTE UE and reroutes it to the old MME. Initial UE Message NSA UE eNodeB MME (old) MME (new) RRC Connection Setup Initial UE Message Reroute NAS Request, including GUTI Select a new MME based on GUMMI in GUTI. The MME identifies the NSA UE and reroutes it to a new MME. Initial UE Message MME (old): does not support NSA; MME (new): supports NSA. Function switch on the eNodeB side: CNOPERATOR.OperatorFunSwitch: DCN_SUPPORT_SWITCH MME selection based on DECOR requires wireless support (starting from 18A) and CN support (starting from 19A).
HUAWEI TECHNOLOGIES CO., LTD. Page 25 Thank you
HUAWEI TECHNOLOGIES CO., LTD.  Inter-site DC: This scenario supports only the X2 transmission interconnection solution (< 20 ms).  Intra-site DC: CI interconnection (not recommended)  Intra-site DC based on transmission interconnection (recommended) LSW LSW LSW Interconnection Between gNodeB and eNodeB Under EN-DC  Intra-site DC: L/NR co-MPT (supported in 19A) TRAN Co-PDCP RLC (L) RLC (NR) Split Bearer UBBP (NR) UBBP (L) UBBP (L) UMPT(LNR) 5900 TRAN PDCP (NR) RLC (L) RLC (NR) Split Bearer PDCP (L)

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566204064-SRAN13-1-15-0-NSA-Networking-Based-on-EPC-20180905.pptx

  • 1. HUAWEI TECHNOLOGIES CO., LTD. www.huawei.com Huawei Confidential Security Level: 2024/1/4 SRAN15.0 NSA Networking based on EPC
  • 2. HUAWEI TECHNOLOGIES CO., LTD. Objectives  After completing this course, you will be able to understand the basic principles, application scenarios, and specifications of the NSA Networking based on EPC feature, and be able to site-design, configure, commission, and verify the feature by referring to related documents.
  • 3. HUAWEI TECHNOLOGIES CO., LTD. Page 3 NSA Standard Planning and Functions  NSA: Completed the NSA standard architecture in December 2017, froze procedures and messages in March 2018, and specified message IEs in June 2018. LTE-A Pro 2016 5G New RAT Rel-15 2017 2018 2019 5G Phase 1.1 5G Phase 1.2 5G Phase 2 Rel-16 Rel-14 NR NSA (non-independent RAT) NR SA (independent RAT) Full-IMT2020 NR • Definitions of NGCN and NR NSA, SA architecture (eMBB/URLLC) • Full 5G standard and mMTC capability definition • Enhanced capability definition: Soft AI/D2D/D-TDD/Flexible Duplex • NSA definition, eMBB • Numerology, frame structure • Native M-MIMO & waveform • eMBB • URLLC • mMTC  SRAN13.1 is the first version of NSA Networking based on EPC. In SRAN15.0, interference coordination is added and mobility management is enhanced.  Carrier management  Mobility management  Data split (UL/DL)  Uplink power control  eNodeB and gNodeB interconnection modes  Interference coordination between LTE and NR NR service objectives Expected in 2019 H2 Launch of NSA terminals
  • 4. HUAWEI TECHNOLOGIES CO., LTD. Page 4 LTE+NR DC Deployment Scenarios LTE Anchor, EPC eLTE Anchor, New Core NR Anchor, New Core Option 3 [18B/19A] S1 X2 NR Non-Standalone EPC NC LTE NR EPC NC LTE X2 EPC NC LTE NR Option 3a Option 3X [18B/19A] S1 S1 EPC NR EPC NR NC NC Option 7 Option 7a eLTE EPC NC NR eLTE Option 4 S1-U EPC NC NR eLTE Option 4a eLTE S1-U Ng Xn Ng Ng-U NR Standalone X2-C NR Legend User Plane Control Plane Phase 1.1 Phase 1.2 (new core) Note: Option 2/5 is NR/eLTE standalone. For LTE- NR DC, Huawei currently focuses on Option 3/3x NSA deployment. EPC NR NC Option 7X eLTE Ng Xn Xn-C Ng-U 5G NSA gNodeBs will support 5G SA without any hardware changes. EN-DC NGEN-DC NE-DC in option 3x, S1-U with LTE only used for LTE bearer setup and GBR service. No data transferred.
  • 5. HUAWEI TECHNOLOGIES CO., LTD. Page 5 DC Related Concepts MR-DC category Specific Scenario Full Name Core network MN SN Option MR-DC with EPC EN-DC E-UTRA-NR Dual Connectivity EPC LTE NR 3/3a/3x MR-DC with 5GC NGEN- DC NG-RAN E- UTRA-NR Dual Connectivity 5GC eLTE NR 7/7a/7x NE-DC NR-E-UTRA Dual Connectivity 5GC NR eLTE 4/4a DC (Dual-Cell): Two carriers are bundled to implement a technology that doubles the rate of a single carrier. like DC-HSDPA+ in UMTS. This DC(Dual-Cell) is not the one described in this document. DC（Dual Connection）：Indicates the operation mode of the UE in RRC connected mode. The UE is configured with a primary cell combination and a secondary cell group. The "DC" in the document indicates the LTE DC. MR-DC ：Multi-RAT Dual Connectivity. Including EN-DC, NE-DC, and NGEN-DC. MeNB：Master eNB, the eNB with S1-MME interface in the DC. SgNB：Secondary gNodeB, the NR site configured by the MeNB through RRC connection signaling for the NSA DC terminal. In 18B and 19A, only the NR site can be set to the SgNB. Pcell：Primary Cell. Primary cell of the MeNB, which cell the NSA DC terminal camps on. PSCell：Primary Secondary Cell: The primary cell of the SgNB which is configured by the MeNB using RRC connection signaling for NSA DC user. The PSCell is in the activated state once PSCELL is configured successfully. Scell：Secondary Cell, a secondary cell configured by the MeNB. It works on the SCC, which can provide more radio resources for the NSA DC terminal. Cell Group：A group of serving cells on the MeNB or the SeNB In the DC. MCG：Master Cell Group. A cell group on the MeNB has one Pcell and one or more SCells. SCG：Secondary Cell Group. In the DC, the serving cell is only related to the SgNB, and has one PSCell and one or more optional SCells. 3GPP 36300-R14
  • 6. HUAWEI TECHNOLOGIES CO., LTD. Contents  Functions and Principles • EN-DC Carrier Management • EN-DC Data Split • EN-DC Uplink Power Configuration  Feature Planning  Feature Installation and Commissioning  Feature Acceptance and Maintenance
  • 7. HUAWEI TECHNOLOGIES CO., LTD. Page 7 EN-DC Carrier Management • The eNodeB is MeNB, and the gNodeB is SgNB. • EN-DC specifications: 1 MeNB+1 SgNB • Intra-RAT CA specifications: DL: LTE support 5CC, NR support 2CC(Only intra-band CA were supported in NR side). UL: LTE 1CC, NR C-BAND 2CC(Only intra-RAT CA were supported in NR side)  NSA networking based on EPC  MeNB carrier management • PCC anchor selection(for UE in RRC_CONNECTED status, RRC_IDLE status, duplex- mode-priority-based PCC anchoring selection, and load-based PCC anchoring selection) • SCC carrier management (SCell configuration, SCell change, enhanced SCell selection, SCell activation, SCell deactivation, and SCell removal) The MeNB carrier management is identical with LTE carrier management. For details, see <LTE Carrier Aggregation Feature Parameter Description>.  SgNB carrier management (only PSCell configuration) • Triggering conditions of PSCell configuration: 1. The MeNB PCC anchoring procedure is complete. 2. The UE supports NR. 3. The one-way transmission delay between the MeNB and SgNB is less than 60ms (20ms for better performance). • PSCell Configuration Procedure Step 1: The MeNB fills and delivers an SCG measurement control message. The MeNB delivers the NR measurement control to the UE. Direct signaling interaction between the gNodeB and the UE is not supported. Step 2: GAP-assisted measurement control is performed. When a UE needs to measure the quality of inter-frequency channels, GAP- assisted measurement needs to be started. Step 3: The UE sends an event B1 measurement report to the MeNB. Step 4: After receiving the measurement report, the MeNB decides to trigger an SgNB Addition (PSCell configuration) procedure. If multiple cells are reported in the measurement report, the MeNB adds the strongest RSRP cell of SgNB reported in the measurement report. CC1 CC2 CC3 CC4 CC5 3.5G LTE NR DC 3.5G LTE 5CC + NR 2CC Please show the corresponding NE: MN, SN; MCG, SCG; Pcell, Pscell, Scell;
  • 8. HUAWEI TECHNOLOGIES CO., LTD. Page 8 SgNB Addition Procedure 3GPP.TS.37.3400
  • 9. HUAWEI TECHNOLOGIES CO., LTD. Page 9 EN-DC Data Split MeNB (LTE) PDCPLTE RLCLTE MACLTE SgNB (NR) PDCPNR RLCNR MACNR S1-U X2 RLCLTE MeNB (LTE) PDCPLTE RLCLTE MACLTE SgNB (NR) PDCPNR RLCNR MACNR S1-U X2 RLCLTE Data split at LTE PDCP layer MCG Split Bearer:  Downlink data split architecture  Parameter settings for downlink data split SGW MCG Split Bear SCG Split Bear 1. The MAC/RLC entities of the master or secondary base stations corresponding to the UE are independent. 2. Uplink data scheduling and BSR reporting are independent. 3. On the UE side, the PDCP entity is shared by NR and LTE. 4. The UE performs uplink data split according to the configuration command delivered by the master base station. MAC MAC RLC RLC PDCP UE Split bearer MeNB/MgNB SgNB/SeNB BSR+Data BSR+Data Configuration  Uplink data split architecture LTE parameter NR CQI level parameter NsaDcDefaultBearerMode NsaDcUeMcgUlAmbrRatio UlDataSplitPrimaryPath UlDataSplitThreshold UlDataSplitThreshold Data split at NR PDCP layer SCG Split Bearer:
  • 10. HUAWEI TECHNOLOGIES CO., LTD. Page 10 Typical scenario parameter setting Solution: 1. Data distribution to the PDCP anchor is preferred. 2. The X2 transmission delay and LTE/NR RLC buffer delay are supplemented. 3. Packets are sent in turn based on the ratio of the RLC perceived rate.  Dynamic data split solution (gNB PDCP split as example)  The 5G gNB PDCP layer distributes data to the LTE RLC and NR RLC layers by packet. 5G uplink and downlink balance area 5G uplink restricted area Downlink data carried on 5G Uplink data carried on 4G 4G coverage  NR UL/DL Separation  NR CP/UP Separation UE eNodeB gNodeB Parameter Dynamic data split NR UL/DL Separation NR CP/UP Separation DlDataPdcpSplitMode SCG_AND_MCG SCG_ONLY SCG_ONLY UlDataSplitPrimaryPath SCG MCG SCG UlDataSplitThreshold BIT0 Infinity Infinity For Insufficient NR uplink coverage scenario. Static configuration: UL data transmitted on LTE, and DL data transmitted on NR. • CP data carried on LTE, UP data carried on NR • NR can provide high capacity/throughput by large bandwidth. • LTE provide mobility, and handovers can be performed without any interruptions.  Typical scenario parameter setting (Option 3X as example) • Actual RLC buffer • Traffic of PDCP PDUs received by RLC • User-perceived RLC rate Reporting period: 100 ms DL Data Delivery Status [10 ms]: • Actual RLC buffer [100 ms] • Traffic of PDCP PDUs received by RLC [100 ms] • User-perceived RLC rate [100 ms] Distributed data Status feedback
  • 11. HUAWEI TECHNOLOGIES CO., LTD. Page 11 EN-DC Uplink Power Configuration  Uplink power configuration • A proper proportion of the UE power is allocated between LTE and NR to ensure the transmission of uplink data and signaling of the UE. • Power configuration parameters (controlled on the LTE side)-19A NsaDcUeMcgUlMaximumPower (NSA DC UE MCG uplink maximum power) NsaDcUeScgUlMaximumPower (NSA DC UE SCG uplink maximum power) • Power configuration According to 3GPP specifications, the maximum uplink transmit power of NSA UEs is 23 dBm. This version supports only power control in semi-persistent scheduling. Currently, the uplink TDM power control mode and dynamic power sharing mode are not supported. Therefore, the following configuration is recommended: NsaDcUeMcgUlMaximumPower=NsaDcUeScgUlMaximumPower=20dBm
  • 12. HUAWEI TECHNOLOGIES CO., LTD. EN-DC Interference Avoidance  Solutions • Cross-modulation interference avoidance solution Subframe-level TDM: After LTE-NR subframes are aligned, LTE and NR uplink subframes are scheduled at different time. • X2 interface message in the avoidance solution The frequency information and graph structure are transmitted according to 3GPP X2 interface standard messages.  Scenario Analysis • Cross-modulation interference: LTE-NR uplink concurrency produces cross-modulation interference, affecting LTE downlink reception. • Harmonic interference: LTE uplink secondary harmonic interferes NR downlink reception. Cross-modulation interference Harmonic interference  Customer Benefits • Cross-modulation interference avoidance: LTE common channels are not affected (ensuring UE mobility). Single-user downlink performance improves by 30%. • Harmonic interference avoidance: NR common channels are not affected (ensuring UE mobility). NR S subframes are used for SRS or PRACH transmission, the proportion of UpPTS is small (about 0.07 ms), and LTE U subframes and NR S subframes can be transmitted simultaneously. • Secondary harmonic interference avoidance solution LTE channels are yielded to NR common channels (PBCH/PSS/SSS and common PDCCH) in scheduling. Slot PRB Time-frequency positions of NR common channels LTE channels are yielded to NR common channels in uplink scheduling (converted to the frequency range that generates secondary harmonic interference).
  • 13. HUAWEI TECHNOLOGIES CO., LTD. Page 13 X2 Interface Management MME eNodeB gNodeB SGW S1-C S1-U S1-U X2-C X2-U EN-DC X2 self-management includes the following functions:  X2 Self-Setup The eNodeB sets up EN-DC services to trigger X2 self-setup. X2 self-setup involves manual configuration of the peer IP addresses and automatic configuration of the peer IP addresses. Currently, only X2 self-setup over U2020 is supported, and the eNodeB and gNodeB must be managed by the same U2020.  X2 Self-Update During network operation, the IP address or operator information (MNC, MCC, or Global eNodeB ID) of the peer eNodeB may be modified. When the X2 interface is faulty, the X2 self- setup procedure is triggered again.  X2 Self-Removal The eNodeB proactively releases the X2-U links that are not used or disconnected for a long time. In the EN-DC architecture, the eNodeB/gNodeB supports only the configuration of the X2/S1-U interface in the endpoint configuration mode. • The logical interface between the eNodeB and the gNodeB is the X2 interface. The X2 interface includes the X2 interface on the control plane (X2-C) and X2 interface on the user plane (X2-U). The X2 control plane is based on the SCTP (Stream Control Transmission Protocol) and the user plane is based on the GTP-U (GPRS Tunneling Protocol-User Plane). • The user-plane interface between the gNodeB and the S-GW is S1-U. S1-U is based on the GTP-U. In the Option 3X architecture, the S1-U interface between the gNodeB and S-GW must be configured. S1-U self-setup S1-U self-setup between the gNodeB and S-GW is implemented only in the Option 3X architecture and not in the Option 3 architecture.
  • 14. HUAWEI TECHNOLOGIES CO., LTD. Contents  Functions and Principles  Feature Planning  Feature Installation and Commissioning  O&M and Performance Counters
  • 15. HUAWEI TECHNOLOGIES CO., LTD. Page 17 Version/License Planning  Version Positioning 1. In 18B and 19A, NSA Networking based on EPC is a basic function of 5G NSA networking. 2. NSA Networking based on EPC is a multi-mode basic feature. It is not sold independently and no license is planned.  Feature Names and IDs 00 FDD Multi-mode Basic Features 00 TDD Multi-mode Basic Features 00 NR Multi-mode Basic Features MRFD-131122 MRFD-131132 MRFD-131162 NSA Networking based on EPC (LTE FDD) NSA Networking based on EPC (LTE TDD) NSA Networking based on EPC (NR) 00 FDD Multi-mode Basic Features 00 TDD Multi-mode Basic Features 00 NR Multi-mode Basic Features MRFD-131121 MRFD-131131 MRFD-131161 LTE and NR X2 Interface Self-Configuration (LTE FDD) LTE and NR X2 Interface Self-Configuration (LTE TDD) LTE and NR X2 Interface Self-Configuration (NR)
  • 16. HUAWEI TECHNOLOGIES CO., LTD. Page 18 DC scenario selection & data split configuration Installation and Commissioning-Feature Activation and Data Split Mode Configuration NE Feature MML Command Parameter ID Parameter Name Default Value Recommended Value MOD NRCellAlgoSwitch NsaDcSwitch NSA DC switch ON ON DlDataScgSplitBearerMode Downlink Data SCG Split Bearer Mode SCG_AND_MCG SCG_ONLY UlDataSplitPrimaryPath Uplink Data Split Primary Path MCG SCG UlDataSplitThreshold UL Data Split Threshold BYTE200 BYTE0 MOD eNodeBAlgoSwitch CaAlgoSwitch CA Algorithm Switch OFF FreqCfgSwitch-1 PccDlEarfcn PCC Downlink EARFCN None Keep current value if exist PreferredPccPriority Preferred PCC Priority 0 Keep current value if exist PccA4RsrpThd PCC A4 RSRP Threshold -105 Keep current value if exist PccA4RsrqThd PCC A4 RSRQ Threshold -20 Keep current value if exist PccDlEarfcn PCC DL EARFCN None LTE DL EARFCN ScgDlArfcn SCG DL ARFCN None NR DL NARFCN ScgDlArfcnPriority SCG DL ARFCN Priority None Refer to Planning Result NsaDcB1ThldRsrp NSA DC B1 Event RSRP Threshold -105 -105 NsaDcAlgoSwitch NSA DC Algorithm Switch OFF NSA_DC_CAPABILITY_SWITCH-1 NsaDcDefaultBearerMode NSA DC Default Bearer Mode SCG_SPLIT_BEARER SCG_SPLIT_BEARER NsaDcUeMcgUlAmbrRatio NSA DC User MCG UL AMBR Ratio 50% 0.3 NsaDcUeMcgUlPowerRate NSA DC UE MCG UL Power Rate 9 9 NsaDcUeScgUlPowerRate NSA DC UE SCG UL Power Rate 9 9 MOD UECOOPERATIONPARA SpecUserCooperationSwitch Identify specific UEs SpecUeIdentifySwitch:Off SpecUeIdentifySwitch-1 MOD CELL DlBandWidth Downlink Bandwidth None CELL_BW_N50 DlArfcn Downlink ARFCN None NR DL NARFCN UlArfcnConfigInd Uplink ARFCN Configuration Indicator NOT_CFG NOT_CFG Mcc Mobile Country Code None Refer to Actual information. Mnc Mobile Network Code None Refer to Actual information. gNodebId gNodeB ID None Refer to Planning Result CellId Cell ID None Refer to Planning Result DlArfcn Downlink ARFCN None NR DL NARFCN UlArfcnConfigInd Uplink ARFCN Configuration Indicator None NOT_CFG PhyCellId Physical Cell ID None Refer to Planning Result Tac Tracking Area Code None Refer to Planning Result Mcc Mobile Country Code None Refer to Planning Result Mnc Mobile Network Code None Refer to Planning Result gNodebId gNodeB ID None Refer to Planning Result CellId Cell ID None Refer to Planning Result MOD NRCellNsaDcConfig NR gNodeB MRFD-131162 NSA Networking based on EPC (5G NR) MOD NsaDcMgmtConfig ADD NRNFREQ ADD NREXTERNALCELL ADD NRNRELATIONSHIP ADD NrScgFreqConfig ADD PCCFREQCFG (Keep current value if exist, don't modify) MRFD-131122 NSA Networking based on EPC (LTE FDD) LTE eNodeB Sample: 18B Option3x LTE -> NR Neighbor LTE parameter NR parameter
  • 17. HUAWEI TECHNOLOGIES CO., LTD. Page 19 Installation and Commissioning-Feature Activation and Data Split Mode Configuration Sample: 19A Option3x LTE -> NR Neighbor LTE parameter NR parameter DC scenario selection & data split configuration CQI level parameter
  • 18. HUAWEI TECHNOLOGIES CO., LTD. Activation Evaluation  LTE Traffic Statistics  NR Traffic Statistics Counter Name Counter Description L.Traffic.User.NsaDc.PCell.Avg Average number of UEs that treat the local cell as their PCell in the LTE-NR NSA DC state L.Thpt.bits.DL.McgSplit.MeNB Total traffic volume offloaded from UEs in the PCell at the PDCP layer to the MeNB during LTE-NR NSA DC 3C offloading L.Thpt.bits.DL.McgSplit.SgNB Total traffic volume offloaded from UEs in the PCell at the PDCP layer to the SgNB during LTE-NR NSA DC 3C offloading L.Thpt.bits.UL.McgSplit.MeNB Total uplink MeNB traffic volume received by UEs in the PCell from the PDCP layer of the MeNB during LTE-NR NSA DC 3C offloading L.Thpt.bits.UL.McgSplit.SgNB Total uplink SgNB traffic volume received by UEs in the PCell from the PDCP layer of the MeNB during LTE-NR NSA DC 3C offloading 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 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 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 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 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 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 Counter Name Counter Description N.User.NsaDc.PSCell.Avg Average number of LTE-NR NSA DC UEs using the current cell as PSCell N.NsaDc.SgNB.Add.Att Number of SgNB addition requests in the LTE-NR NSA DC scenario N.NsaDc.SgNB.Add.Succ Number of successful SgNB additions in the LTE-NR NSA DC scenario N.NsaDc.InterSgNB.PSCell.Change.Att Number of inter-SgNB PSCell change requests in the LTE-NR NSA DC scenario N.NsaDc.InterSgNB.PSCell.Change.Succ Number of successful inter-SgNB PSCell changes in the LTE-NR NSA DC scenario N.NsaDc.IntraSgNB.PSCell.Change.Att Number of intra-SgNB PSCell change requests in the LTE-NR NSA DC scenario N.NsaDc.IntraSgNB.PSCell.Change.Succ Number of successful intra-SgNB PSCell changes in the LTE-NR NSA DC scenario N.NsaDc.SgNB.Rel Total number of SgNB releases in the LTE-NR NSA DC scenario N.NsaDc.SgNB.AbnormRel Number of abnormal SgNB releases in the LTE-NR NSA DC scenario N.NsaDc.DRB.Add.Att Number of DRB addition requests for LTE-NR NSA DC UEs on the SgNB N.NsaDc.DRB.Add.Succ Number of successful DRB additions for LTE-NR NSA DC UEs on the SgNB N.NsaDc.DRB.Rel Number of DRB releases for LTE-NR NSA DC UEs on the SgNB N.NsaDc.DRB.AbnormRel Number of abnormal DRB releases for LTE-NR NSA DC UEs on the SgNB N.PDCP.DL.X2U.TrfPDU.TxPackets Number of downlink PDCP PDUs transmitted over the X2 interface in a cell N.PDCP.UL.X2U.TrfPDU.RxPackets Number of uplink PDCP PDUs received over the X2 interface in a cell N.PDCP.Vol.DL.X2U.TrfPDU.Tx Traffic of downlink PDCP PDUs transmitted over the X2 interface in a cell N.PDCP.Vol.UL.X2U.TrfPDU.Rx Traffic of uplink PDCP PDUs received over the X2 interface in a cell
  • 19. HUAWEI TECHNOLOGIES CO., LTD. Page 21 Examples of Signaling Tracing LTE Uu interface tracing (event B1 measurement of NR delivered by the eNodeB) S1 interface tracing (E-RAB path change in the Option 3X architecture) L-NR X2 interface tracing (the eNodeB sends an SgNB addition request) E-RAB path change
  • 20. HUAWEI TECHNOLOGIES CO., LTD. Page 22 NSA DC Deployment on the Live Network New RAN OSS New CN OSS NG Core AAU (NR 3.5G) RRU(TDD1900) RRU(TDD2600) ③ New direct-connected 100G CPRI optical cable BBU5900 (NR) BBU39X0(LTE) ④ New BBU5900 ⑥ Transmission bandwidth: 8.5 Gbit/s (peak bandwidth of a single cell) 16.5 Gbit/s (peak bandwidth of three cells) GPS ⑤ Added GPS/BeiDou divider and cables CPE Terminal Antenna RRU and CPRI BBU Transmission and clock Core network NMS ② Added NR 3.5 GHz AAU Divider ⑦ NG Core ⑧ New PLMN (5G) ⑨ Added RAN OSS ⑧ Added CN OSS 5G TUE 4G TUE XGE electrical interface interconnection E2E networking
  • 21. HUAWEI TECHNOLOGIES CO., LTD. UE Access network Policy Overview gNodeB Anchor eNodeB 5G-Uu NSA UE Transport Network RAN Network MME/SGSN S-GW/P-GW/GGSN MME/SGSN S-GW/P-GW/GGSN Core Network Existing EPC New EPC+ 4G only UE 4G-Uu UE Access Anchor UE Access Core Network Purpose: Purpose: Optional UE access anchor policy: Optional UE access CN policy: NSA UE and 4G only UE access control at RAN 1. NSA UE can be accessed only at anchor 2. Whether 4G only UE can access anchor 1. Multi-PLMN access control a) Combining MOCN Policies b) 5M LTE Dedicated Carrier realize isolation. 2. Single PLMN access control: a) reserved cell of the operator + AC level control b) Select NSA Terminal by TAC+IMSI NSA UE and 4G only UE core network access control at CN 1. NSA UE can only select EPC+ 2. Whether 4G only UE can be controlled by EPC+ 1. Décor (19A support) 2. MOCN 3. Fixed GUMMEI by Msg5+S1 flex (Not recommended. Need R&D engineers support, if it’s required.) 4. Use 5M LTE dedicated network, select the corresponding CN based on the UE access anchor control policy. UE access network policy involve UE access anchor policy and UE access core network policy. Material & Video Release Link
  • 22. HUAWEI TECHNOLOGIES CO., LTD. MME Selection Based on DECOR (DCN) in 19A The NAS message redirection procedure is as follows: 1. Upon the access of a UE, the eNodeB selects an MME for the UE based on access information and sends an Initial UE Message to the MME. 2. If an NSA UE accesses the MME (old) or an LTE-only UE (including a non-subscription NSA-capable UE) accesses the MME (new), it triggers an NAS message redirection procedure by sending a Reroute NAS Request message to the eNodeB. This message contains the following IEs: - original RAN message, which is a complete packet data unit (PDU) received from the RAN. It contains the original NAS request message and all RAN IEs. - MME Group ID, which determines the next serving DCN. - Additional GUTI, which helps the eNodeB to select an MME. - UE Usage Type, which is optional. Its value is specified upon UE subscription and sent by the eNodeB to the next MME. 3. The eNodeB selects a new MME based on the IEs MME Group ID and Additional GUTI carried in the Reroute NAS Request message. 4. The eNodeB sends an Initial UE Message to the newly selected MME. This message contains the IEs MME Group ID and UE Usage Type (which is available only if it is contained in the Reroute NAS Request message). Based on the IE MME Group ID, the new MME determines that this is an Initial UE Message sent after a triggered redirection. Therefore, the MME does not forward this message but processes or rejects it. LTE UE eNodeB MME (new) MME (old) RRC Connection Setup Initial UE Message Reroute NAS Request, including GUTI Select the old MME based on GUMMI in GUTI The MME identifies the LTE UE and reroutes it to the old MME. Initial UE Message NSA UE eNodeB MME (old) MME (new) RRC Connection Setup Initial UE Message Reroute NAS Request, including GUTI Select a new MME based on GUMMI in GUTI. The MME identifies the NSA UE and reroutes it to a new MME. Initial UE Message MME (old): does not support NSA; MME (new): supports NSA. Function switch on the eNodeB side: CNOPERATOR.OperatorFunSwitch: DCN_SUPPORT_SWITCH MME selection based on DECOR requires wireless support (starting from 18A) and CN support (starting from 19A).
  • 23. HUAWEI TECHNOLOGIES CO., LTD. Page 25 Thank you
  • 24. HUAWEI TECHNOLOGIES CO., LTD.  Inter-site DC: This scenario supports only the X2 transmission interconnection solution (< 20 ms).  Intra-site DC: CI interconnection (not recommended)  Intra-site DC based on transmission interconnection (recommended) LSW LSW LSW Interconnection Between gNodeB and eNodeB Under EN-DC  Intra-site DC: L/NR co-MPT (supported in 19A) TRAN Co-PDCP RLC (L) RLC (NR) Split Bearer UBBP (NR) UBBP (L) UBBP (L) UMPT(LNR) 5900 TRAN PDCP (NR) RLC (L) RLC (NR) Split Bearer PDCP (L)