Huawei LTE eNodeB Troubleshooting Overview
• Jeff Fry, Wimax/LTE Systems Integration & Test, Technology
Development
LTE eNodeB Troubleshooting Document:
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<Some location on portal>
LTE eNodeB Troubleshooting Overview:
• LTE LMT/EMS
• Subscriber Troubleshooting
• eNodeB Troubleshooting
• eNodeB Log Files
© 2006 Clearwire Corporation CONFIDENTIAL & PROPRIETARY, Limited Distribution to Authorized Persons Only
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.
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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:
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S1-U : interface to the SGW
S1-MME : interface to the MME
X2 : interface to another eNodeB for mobility
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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
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eNodeB LMT Access
• Local Maintenance Terminal is still web-based HTTP.
• Primary use MML for field techs.
• Access is local or remote.
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EMS for LTE: Main Topology
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eNodeB Topo Object is initially created in a default EASY_DEPLOYMENT
subnet alongside Wimax BTS.
Can be moved to a new LTE subnet.
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EMS for LTE: CME
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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.
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EMS for LTE: Alarms
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Alarms can be sent by the Wimax BS and eNodeB.
Some alarms are common and will only be sent by the Wimax BS.
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Subscriber Troubleshooting
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Subscriber troubleshooting options in LTE are limited.
DSP S1INTERFACE:;
That’s it! No subscriber mac tracing or signal tracing due to architecture.
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eNodeB Troubleshooting: Equipment Status
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Maintenance->Device Panel to visually see equipment and status.
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eNodeB Troubleshooting: Equipment Status (2)
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DSP BRD:; Shows LTE boards and occupied Wimax slots.
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DSP BRDVER:; Shows board versions.
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eNodeB Troubleshooting: Equipment Status (3)
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LST ALMAF:; Shows LTE only alarms.
DSP GPS:; Shows GPS status.
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Resetting:
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RST ENODEB:;
RST BRD:;
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eNodeB Troubleshooting: Configuration Management
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View LTE configuration via CME Panorama Browser.
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Make configuration changes via MML or a CME workspace.
© 2006 Clearwire Corporation CONFIDENTIAL & PROPRIETARY, Limited Distribution to Authorized Persons Only
eNodeB Troubleshooting: Configuration Management (2)
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Configuration backup, restoring, and download via Maintenance->Backup
Management->NE Backup
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eNodeB Troubleshooting: Configuration Management (3)
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Configuration audits can be performed via CME->Compare Parameters.
Compare with other eNodeBs and templates.
© 2006 Clearwire Corporation CONFIDENTIAL & PROPRIETARY, Limited Distribution to Authorized Persons Only
eNodeB Troubleshooting: eNodeB Licensing
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LTE has a new licensing scheme:
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Separate license file for each eNodeB.
License file provided by Huawei based on ESN.
License applied during commissioning process.
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License->NE License Management->Standalone License to apply and view
licenses.
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DSP LICENSE:; MML command to view actual license data on eNodeB.
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eNodeB Troubleshooting: S1 Configuration and Status
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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:
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LST SCTPLINK:;
DSP SCTPLNK:SCTPNO=0;
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DSP S1INTERFACE:; S1 Interface Status.
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DSP X2INTERFACE:; X2 Interface Status.
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LST S1SIGIP:; S1-MME configuration.
LST S1SERVIP:; S1-U configuration.
LST X2ENODEB:; X2 configuration.
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eNodeB Troubleshooting: Cell Configuration and Status
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DSP CELL:; Shows cell status.
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LST CELL:; Shows cell configuration.
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eNodeB Troubleshooting: Cell Configuration and Status (2)
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BLK CELL / UBL CELL – activate/deactivate cell
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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.
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FIN
• Questions?
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