09_RA4112AEN05GLA0_Flexi Multiradio Basic Troubleshooting
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Flexi Multiradio LTE BTS Basic Troubleshooting
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Objectives
After completing this learning element, the participant should be able to:
Explain basic alarms and alarm handling with Flexi Multiradio LTE BTS
Apply basic troubleshooting
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Content
Retrieve information on alarms and troubleshooting (NOLS and BTS Site Manager)
Localize alarm
Typical alarms in basic troubleshooting seen from BTS Site Manager perspective
Basic troubleshooting steps
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Troubleshooting Information in NOLS
Click on Reference in the list of Operating Documents and than on Alarms
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Information sources in fault situations
Use at least the following information sources when carrying out troubleshooting:
Faults
Faults are the primary source of information in most situations where troubleshooting is needed. Faults are printed out on the fault printer and/or other devices that you have specified for the network element.
For instructions, see Checking BTS faults (NOLS). For fault descriptions, see Flexi Multiradio BTS Faults document (NOLS).
BTS documentation
You can find the latest information in the updated BTS documentation and Technical Notes. Access to the web pages is confined and information is delivered via your local Nokia Siemens Networks representative. Multiradio BTS LTE documentation is delivered via PIC (Product Information Center). The latest SW related documentation, such as List of Generic Faults and Release Note, can be found on the Multiradio BTS Technical Support web pages.
BTS log files
Snapshot files are useful for troubleshooting purposes and must be attached when Resolve case is raised to Tier 3 level. Logs can be fetched locally or remotely with BTS Site Manager. For instructions, see BTS Site Manager Online Help(NOLS).
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Alarm Severity
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Retrieving alarm information in BTS Site Manager
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2
3
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Identifying the alarm source
1
2
3
1.Select Alarm in Faults window
2.Click on icon Show source 3.Alarm source is identified (see also
Source column in the Fault view)
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LOS Alarm
LOS alarm is the root cause.
X2AP and S1AP alarms are just the consequences in this case as
physical interface is disconnected on which all applications (X2AP,
S1AP,..) should run.
Prerequisite for S1AP and X2AP setup is SCTP association which is in
this case also not established.
Therefore Transport layer connection failure is raised.
eNB is in BTS configured state as S1AP link is down (no connection to MME)
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MME IP address
Check MME configuration and IP address in the
Commissioning Wizard
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Adjacent eNB configuration in RL20
In order to check adjacent eNBs configuration in RL20 check
ADIPNO Managed Object under LNBTS.
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Adjacent eNB configuration in RL30
In order to check adjacent eNBs configuration in RL30 check
LNADJ Managed Object(s) under LNBTS.
LNADJ Managed Object(s) are normally created based on
ANR feature implementation and PCI-IP mapping table.
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S1 Interface failure
If S1 interface failure is raised than SCTP association is
established between eNB and MME (eNB and MME exchange
SCTP heartbeats) but S1 setup request was not successful and
S1AP is down.
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Transport layer connection failure in X2 interface
Source: SCTP link for X2 interface.
The transport path (SCTP) for connection to an adjacent BTS has
broken. The reason for this can be an unplugged cable to the adjacent
BTS. No transport path available to pursue operation on the faulty
connection with the adjacent BTS.
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PCI-IP address mapping table
PCI-IP address mapping table
In case wrong table might be provisioned from
OSS, X2 can be established to the wrong
neighbor.
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Failure in optical RP3 interface
Dirty or broken optical cable(s) and/or SFPs or
wrong SFP inserted either in FSM or FRM are main
causes for RP3 alarm.
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Unit blocked - FRM
Block/Unblock will reset the unit.
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Module in Configuring State
Unblocked unit in configuring state.
Alarm Unit blocked is still active.
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Block/Unblock BTS
Block/Unblock BTS will reset the BTS.
TRS shall NOT be reset.
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Reset Site
Reset Site will reset both BTS and TRS.
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eNB connection to iOMS: M-Plane (OAM) link
Two iOMSs can be configured in eNB (Primary and Secondary).
No alarm is raised in BTS Site Manager in case eNB is
disconnected from iOMS.
However, the link from NetAct to eNB (through iOMS) is broken.
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Failure in connection between BTS and iOMS or 3rd party tool
Check connectivity to the 3rd party tool if used for e.g.
for subscriber trace.
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GTP-U Path Failure alarm
GTP-U path supervision is optional feature.
Network element did not respond to the GTP-U: Echo
Request message within time.
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GTP-U Path Failure alarm continued
Check GTP-U path configuration and IP address of the SGW in the
Commissioning Wizard.
If GTP-U supervision is set to the value different than zero supervision
is switched on.
SGW IP address set GTPU object is not affecting user plane traffic.
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VSWR alarm
Alarms:
Radio resources switched off and TX failure in MIMO are consequences of the VSWR alarm.
voltage standing wave ratio ; VSWR
Ratio of maximum to minimum voltage in the
standing wave pattern that appears along a
transmission line. It is used as a measure of
impedance mismatch between the transmission line
and its load.
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Block Cell
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Block Cell - continued
Administrative state of the cell and
Blocking state are not the same.
eNB is only Integrated as none of the configured cells is operational.
Signaling link to MME is active.
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Change Cell Administrative State
Cell administrative state can be either:
unlocked shutting down locked
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Cell Administrative State shutting down
Cell final state is -
Locked
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IP Connectivity Test
IP Connectivity Test
Scope
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Save BTS snapshot
BTS Snapshot files are useful for troubleshooting purposes.
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