06 nodeb troubleshooting
TRANSCRIPT
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NodeB Troubleshooting
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References
RAN Troubleshooting Cases
SUPPORT.HUAWEI.COM
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Upon completion of this course, you will be able to:
Know how to find NodeB faults
Grasp NodeB troubleshooting methods
Know the common trace and log collection methods.
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Chapter 1 General Introduction
Chapter 2 Typical Cases
Chapter 3 Trace and Log Collection
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General Trouble-shooting Procedure
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The Ways to Find Faults
Alarm
Alarm console
Alarm box
OMC Shell
Traffic statistics
Drive test
Routine inspection
Customer complaint
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Information Collection
Fault symptoms, occurrence time, place and frequency
Fault coverage, category and associated consequences
Equipment running status before occurrence of a fault
Operations done on the equipment and the corresponding operating results
Alarms occurring when a fault takes place
Board indicator status when a fault occurs
Software version information and log information when a fault occurs
Signaling and internal tracing result when a fault occurs
Measures taken to handle the fault and the corresponding effect
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If RNC has fault, usually it will affect some sites or all of sites
If NodeB has fault, usually it just affect itself and the handover
successful rate of adjacent cells
During implementation or expansion, we can Interchange
NodeB and judge the fault is because of RNC or NodeB
During maintenance, RNC faults dont just affect one NodeB
Locating and Clearing Faults
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Common Fault Types
RAN fault
Cell
Traffic
Link
Interconnection
Clock
Antenna & Feeder
transmission
Operation and maintenance fault
OMC
Software Loading
RNO fault
Access
Call drop
Congestion
Handover
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Basic Troubleshooting Methods (1)
For Simple Fault
Analyzing the Alarm Information and the Indicator status
Comparison/Interchange
For Complex Fault
Analyzing Apparatus and Meter Test Result
Tracing the Interface, Traffic Test
Analyzing Traffic Statistics Result
For Restoring System
Switching/Resetting
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Basic Troubleshooting Methods (2)
Analyzing the Alarm Information
Alarm information comes from the RAN alarm system, indicated
usually through sound, light, LED, and screen output, etc
It includes the detailed description of the abnormality, possiblecauses and restoration suggestions, involving the hardware, link,
trunk and CPU loading ratio, etc
Analyzing the Indicator Status
Indicators display the work status of circuit, link, optical path,node and active/standby mode besides that of the
corresponding boards,
Usually used along with the alarm information
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Basic Troubleshooting Methods (3)
Comparison/Interchange
Comparison:
compare the faulty components or symptoms with the normal
ones, and find the difference
Interchange:
if the fault can not be located even after the standby components
are replaced, you can interchange the normal components (such
as board, optical fiber, etc.) with the potential faulty components
and to compare the work status
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Basic Troubleshooting Methods (4)
Analyzing Apparatus & Meter Test Result
It reflects the fault nature with the visual and quantified data
Some common Apparatus & Meter
Signaling Analyzer, Test phone, Sitemaster, etc.
Tracing the Interface
It is applied in locating the failure causes of subscriber call
connection and inter-office signaling cooperation, etc
The trace result can help to find the cause of call failure directly and
locate the problem or to get the index for the subsequent analysis
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Basic Troubleshooting Methods (5)
Traffic Test
It is a simple and quick method to judge whether the call processing
function and relative modules of the RAN are normal or not
Analyzing Traffic Statistics Result
It is the most useful method for locating RNO fault.
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Basic Troubleshooting Methods (6)
Switching/Resetting
It can not locate the fault cause accurately, and due to the
randomness of software running, the fault may be not able to recur,
thus it is difficult to know the real fault and solve the problem
This method is just an emergency method, so applicable only in the
emergency situation
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Verifying Troubleshooting Result
Check the states of board indicators and alarm box indicators,
and perform dialing test
Review the whole troubleshooting process, note down the key
points in the troubleshooting and summarize the workaround andmethods for improvement to avoid the recurrence of the faults of
the same type
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Chapter 2 Typical Cases
Case 1: Abnormal RTWP
Case 2: Failure to Establish Cells
Case 3: Failure to Deliver the License of the NodeB Through M2000
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Case 1: Abnormal RTWP
Symptom: Abnormal RTWP value is observed
RTWP > 102 dBm continuously
RTWP < 110 dBm continuously
RTWP reaches to a peak value, e.g.
80 dBm intermittently
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RTWP background knowledge
RTWP: Received Total Wideband Power, see TS25.215 for definition
NodeB periodically measures RTWP to evaluate the UL interference level,
measurement reference point: Rx antenna connector
Normal Value: -106dBm 4dB
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RTWP abnormality troubleshooting procedure
If Abnormally High
Configuration issue:
Check the uplink RF sensitivityvalue. Must be set to 0
DSP RFDESPARAM and DSP DESENS
Check the attenuation value of the Rx channel
May caused by missing configuration of RXATTEN parameter
while TMA is available. You need to set the RXATTEN value
according to the gain of the TMA. SET RXATTEN = TMA gainFeeder Loss
Hardware installation issue
Check whether passive TX/RX inter-modulation occurs
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RTWP abnormality troubleshooting procedure
If Abnormally High
UL interference issue
Check if it is caused by neighboring cell interference
Long time real time monitoring
Describe the RTWP symptom (continuously, in rush hours, or
intermittently) and RTWP value range.
Check if it is related to subscribers' behaviors
Real time monitoring on RNC for the number of cell usernumber, to see whether a large number of high-speed packet
subscribers access the system.
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RTWP abnormality troubleshooting procedure
If Abnormally Low
Configuration issue:
Check the attenuation value of the Rx channel
Confirm TMA is available or not, if no TMA, no need to configureRXATTEN
Hardware installation issue
Check the installation of the antenna feeder
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RTWP abnormality troubleshooting procedure
Collect the following traces to R&D personnel if the problem still there
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Chapter 2 Typical Cases
Case 1: Abnormal RTWP
Case 2: Failure to Establish Cells
Case 3: Failure to Deliver the License of the NodeB Through M2000
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Case 2: Failure to Establish Cells
Cell establishment failure includes 2 scenarios
Local cell establishment failure
ALM-4033 Local Cell Unusable issued at NodeB side
Logical cell establishment failure
ALM-2012 Cell Setup Failed at the RNC side.
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Background Knowledge
Mapping between Local Cell and Logical Cell
NodeB: Site => Sector => Local Cell (linking with Local Cell ID)
=> RNC: Local cell => Logical Cell
If the local cells at the NodeB side are not available, theestablishment of logical cells fails.
Cell establishment failure includes local cell establishment failure and
logical cell establishment failure. When local cells fail to be established,
there is a user alarm that local cells are not available at the NodeB side.When logical cells fail to be established, there is an alarm that cell
establishment fails at the RNC side.
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Failure to Establish Local Cells
Configuration issues:
The local cell type should be consistent with the type of the
corresponding sector.
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Failure to Establish Local Cells
Configuration issues:
The baseband resources of the uplink/downlink resource group to
which the cells belong should be enough to be allocated to the cells
Type of Board Uplink Capability (cells) Downlink Capability (cells)
NBBI 3 3
HBBI 3 3
HBBU 3 3
HULP 3 /
HDLP / 6
EBBC 3 6
EBBI 6 6
EULP 6 /
WBBPb 6 6
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Failure to Establish Local Cells
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Failure to Establish Local Cells
Configuration issues:Cell receivingantenna should be configured while the sectorsare
established
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Failure to Establish Local Cells
Configuration issues:Cell transmittingantenna should be configured when local cellsare
established.
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Failure to Establish Local Cells
Configuration issues:
The configuration of the cell transmitting antenna should agree with the
transmitting diversity mode in the sector configuration.
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Failure to Establish Local Cells
Configuration issues:
If multiple cells are established on a RRU link, ensure that the IQ
resources on the RRU link are enough to be allocated.
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Failure to Establish Local Cells
Configuration issues: The maximum transmit power of cells and uplink/downlink frequency
should match the RF hardware attributes. You can run the DSP RRUTC
MML command to view the RF hardware attributes.
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Failure to Establish Local Cells
BBU issues
Run the DSP LOCELL command to query the cell status. If the result
displays baseband resource fault,
Check whether there exists an alarm about the baseband board hardware.
The possible reasons are as follows:
The baseband board hardware related to the cell is faulty.
The resources of the resource group to which the cell belongs are
exhausted, so no resources are available to be allocated to the cell.
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Failure to Establish Local Cells
BBU issues
The baseband board related to the cell is blocked => UBL BRD
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Failure to Establish Local Cells
BBU issues
The baseband board related to the cell is disconnected. Iub link is OK if
the NCP and CCP port status are Normal
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Failure to Establish Local Cells
RRU issues
Run the DSP LOCELL command to query the cell status. If the result
displays RF resource fault,
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Failure to Establish Local Cells
RRU issues
Check whether a hardware alarm occurs to the baseband board. The
possible reasons are listed as follows:
The RF board hardware related to the cell is faulty, for example, the RRU
hardware is faulty.
The carries carried by the RF unit related to the cell are limited, for
example, the 40W MRRU supports two carriers. If a third carrier is
established, cell establishment fails. => Query the RF hardware capability
by DSP RRUTC
The RF board related to the cell is blocked. => UBL BRD
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Failure to Establish Local Cells
RRU issues
The RF board related to the cell is disconnected from the baseband board
You need to check whether the optical module and fiber connection are
normal.
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Failure to Establish Logical Cells
Check whether the logical cells are configured correctly
The transmission configuration at the RNC side should be
consistent with that at the NodeB side, for example, the VPI
and VCI of the AAL2PATH;
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Example: RNC side transmission configuration
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Example: Compare with NodeB side Transmission
Configuration
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Failure to Establish Logical Cells
Check whether the logical cells are configured correctly
The maximum transmit power of logical cells should be
equal to or lower than that of local cells;
The cell parameter configuration at the RNC side should be
consistent with that at the NodeB side.
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Failure to Establish Logical Cells
Query the failure reason by running the DSP CELLcommand at the RNC side
When the establishment of logical cells still fails even if
the configurations are correct, provide a feedback of
the related information to the R&D department for
analysis.
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Information Collection List to R&D personnel
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Chapter 2 Typical Cases
Case 1: Abnormal RTWP
Case 2: Failure to Establish Cells
Case 3: Failure to Deliver the License of the NodeB Through M2000
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Case 3: Failure to Deliver the License of the
NodeB Through M2000
When the License of the NodeB is delivered on the M2000, the
M2000 interface shows the failure of the delivery.
When you run the DSP LICENSEcommand on the NodeB to
query the License status, the result shows the status of the original
License.
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Troubleshooting Procedure
Failure to Deliver the Licenses of All NodeB Sites
Check whether the connections between the M2000 and the NodeB
sites are normal, and check whether these NodeB sites are in normal
state in the main topology.
Attempt to deliver the licenses again.
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Troubleshooting Procedure
Failure to Deliver the Licenses of Some the NodeB Sites
Check whether the connections between the M2000 and the NodeB
sites are normal, and check whether these NodeB sites are in normal
state in the main topology.
Attempt to deliver the licenses again.
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Troubleshooting Procedure
Failure to Deliver the Licenses of Some the NodeB Sites
Right-click the faulty the NodeB process, and select Detail from the
shortcut menu. Usually, you can determine the fault reason or the
incorrectly configured control item
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Meaning of part of common control items
UL CE Quantity of channel elements for processing in Up link (a number
divisible by 16)
DL CE Quantity of channel elements for processing in Down link (a number
divisible by 16)
Local Cell Quantity of configured Local Cells on NodeB
HSDPA Enabling of HSDPA function ( 1enable , 0disable)
HSDPA RRM Enabling of HSDPA RRM function ( 1enable , 0disable)
HS-PDSCH Code Quantity of High Speed PDSCH Code for all cells on NodeB
HSUPA Enabling of HSUPA function ( 1enable , 0disable)
PA[47,8dBm] Quantity of configured Cells on NodeB with max Power 47,8 dBm
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Troubleshooting Procedure
Checking the license control items
Check whether the number of downlink/uplink CEs exceeds the limit
allowed by the License,
Check whether the configured number of local cells is smaller than the
actual one.
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Troubleshooting Procedure
Checking the license control items
If the HSUPA control item in the License is enabled, check whether
the HSUPA function of the BTS is enabled by running the LST
BRDHSUPAcommand on the LMT. If the HSUPA function of the BTS
is not enabled, enable the HSUPA function by running the SETBRDHSUPAcommand.
PA[XXDbm] refers to the maximum number of local cells when the
maximum transmit power does not exceed XXDbm. If the NodeB has
a 46-dBm cell and the control item delivered by the License is 43 dBm,
the delivery fails. It is the first control item that may be ignored.
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Information Collection to R&D stuff if still unsolved
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Chapter 1 General Introduction
Chapter 2 Typical Cases
Chapter 3 Trace and Log Collection
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Collecting NodeB Fault Location Data
Type of NodeB Fault Location Data
NodeB Main Board Logs
NodeB Board Logs
Signaling Tracing Messages on the Iub Interface
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Collecting NodeB Fault Location Data
Collecting NodeB Main Board Log via NodeB LMT
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Collecting NodeB Fault Location Data
Collecting NodeB Main Board Log via M2000
Choose Software Browser.
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Collecting NodeB Fault Location Data
Collecting NodeB Main Board Log via M2000
Then, select NEon the left pane and select the
corresponding NodeB site in the list.
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Collecting NodeB Fault Location Data
Collecting NodeB Main Board Log via M2000
Then, the right pane displays the corresponding tab.
To upload the main control log, click Other, select
MAINBRDLOG, and click Upload To NMat the right lower
corner.
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Collecting NodeB Fault Location Data
Collecting NodeB Main Board Log via M2000
Set the name of the log to be uploaded (use the format of Site name +
date to discriminate the file from the previously downloaded files), and
tick Compress Upload(reduce the time of file upload).
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Collecting NodeB Fault Location Data
Collecting NodeB Main Board Log via M2000
Then, the main control log of The NodeB is uploaded to the M2000
server. Select the NM Servertab, and then select an appropriate NodeB
site.
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Collecting NodeB Fault Location Data
Collecting NodeB Main Board Log via M2000
To upload a log file, select Other. The list below displays the name and
site of the log file uploaded to the M2000 server. Find and select the
uploaded log file from the list.
Click the right Transferbutton, select From NM to Client, and set the
upload path on the local PC. Then, the selected log file is uploaded to
the local PC.
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Collecting NodeB Fault Location Data
Collecting NodeB Board Log via NodeB LMT
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Collecting NodeB Fault Location Data
Collecting Signaling Tracing Messages on the Iub Interface via NodeB LMT
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