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Huawei LTE eNodeB Troubleshooting Overview

Huawei LTE eNodeB Troubleshooting Overview. Jeff Fry, Wimax /LTE Systems Integration & Test, Technology Development LTE eNodeB Troubleshooting Document: <Some location on portal> LTE eNodeB Troubleshooting Overview: LTE LMT/EMS Subscriber Troubleshooting eNodeB Troubleshooting

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Huawei LTE eNodeB Troubleshooting Overview

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  1. Huawei LTE eNodeB Troubleshooting Overview • Jeff Fry, Wimax/LTE Systems Integration & Test, Technology Development LTE eNodeB Troubleshooting Document: • <Some location on portal> LTE eNodeB Troubleshooting Overview: • LTE LMT/EMS • Subscriber Troubleshooting • eNodeB Troubleshooting • eNodeB Log Files

  2. Dual-mode Wimax/LTE: Basics • TD-LTE, Band 41 • EARFCN=40590 (freq=2590MHz) • 20 MHz • LTE deployed as 3 sectors using Reuse-1 (one frequency). • Each configured carrier is a Cell. • LTE initially deployed as S111.

  3. Network Architecture • MME – Mobile Management Entity controls mobile signaling: network attach/authentication (to HSS), handovers, idle mode • SGW – Service Gateway provides the user plane data traffic. • HSS – Home Subscriber Server provides subscriber provisioning. • Important interfaces from the eNodeB: • S1-U : interface to the SGW • S1-MME : interface to the MME • X2 : interface to another eNodeB for mobility

  4. Dual-mode Wimax/LTE: Shared BS • Wimax and LTE run on the same base station with addition of LTE cards. • Wimax and LTE share the same radio head (RRU). • Separate backhaul for Wimax & LTE. GigE for LTE and 100MB ETH for Wimax. Wimax Carriers on 1st fiber LTE Carriers on 2nd fiber LTE Cards: LBBP, LMPT

  5. eNodeB LMT Access • Local Maintenance Terminal is still web-based HTTP. • Primary use MML for field techs. • Access is local or remote.

  6. EMS for LTE: Main Topology • eNodeBTopo Object is initially created in a default EASY_DEPLOYMENT subnet alongside Wimax BTS. • Can be moved to a new LTE subnet.

  7. EMS for LTE: CME • New CME (CM Express) menu/component for configuration management. • Configuration viewing only via Panorama Browser. View many eNodeB configurations in bulk. • Configuration changes made in a planned area (workspace). • Parameter comparison and audit functions available.

  8. EMS for LTE: Alarms • Alarms can be sent by the Wimax BS and eNodeB. • Some alarms are common and will only be sent by the Wimax BS.

  9. Subscriber Troubleshooting • Subscriber troubleshooting options in LTE are limited. • DSP S1INTERFACE:; • That’s it! No subscriber mac tracing or signal tracing due to architecture.

  10. eNodeB Troubleshooting: Equipment Status • Maintenance->Device Panel to visually see equipment and status.

  11. eNodeB Troubleshooting: Equipment Status (2) • DSP BRD:; Shows LTE boards and occupied Wimax slots. • DSP BRDVER:; Shows board versions.

  12. eNodeB Troubleshooting: Equipment Status (3) • LST ALMAF:; Shows LTE only alarms. • DSP GPS:; Shows GPS status. • Resetting: • RST ENODEB:; • RST BRD:;

  13. eNodeB Troubleshooting: Configuration Management • View LTE configuration via CME Panorama Browser. • Make configuration changes via MML or a CME workspace.

  14. eNodeB Troubleshooting: Configuration Management (2) • Configuration backup, restoring, and download via Maintenance->Backup Management->NE Backup

  15. eNodeB Troubleshooting: Configuration Management (3) • Configuration audits can be performed via CME->Compare Parameters. • Compare with other eNodeBs and templates.

  16. eNodeB Troubleshooting: eNodeB Licensing • LTE has a new licensing scheme: • Separate license file for each eNodeB. • License file provided by Huawei based on ESN. • License applied during commissioning process. • License->NE License Management->Standalone License to apply and view licenses. • DSP LICENSE:; MML command to view actual license data on eNodeB.

  17. eNodeB Troubleshooting: S1 Configuration and Status • S1-MME and S1-U interfaces to MME and SGW respectively. • X2 interfaces to other eNodeBs for mobility signaling. • SCTP is transport layer for S1 and X2. • SCTP link status: • LST SCTPLINK:; • DSP SCTPLNK:SCTPNO=0; • DSP S1INTERFACE:; S1 Interface Status. • DSP X2INTERFACE:; X2 Interface Status. • LST S1SIGIP:; S1-MME configuration. • LST S1SERVIP:; S1-U configuration. • LST X2ENODEB:; X2 configuration.

  18. eNodeB Troubleshooting: Cell Configuration and Status • DSP CELL:; Shows cell status. • LST CELL:; Shows cell configuration.

  19. eNodeB Troubleshooting: Cell Configuration and Status (2) • BLK CELL / UBL CELL – activate/deactivate cell • CELL_HIGH_BLOCK - immediately deactivates cell. • CELL_MIDDLE_BLOCK – deactivates after a time period. • CELL_LOW_BLOCK – deactivates when no subs. • ACT CELL / DEA CELL – activate/deactivate cell is equivalent to CELL_HIGH_BLOCK.

  20. FIN • Questions?

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