7.own000301 ran troubleshooting issue4.1
DESCRIPTION
Huawei RAN TROUBELSHOOTING GUIDETRANSCRIPT
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Internal
RAN Troubleshooting
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This training mainly provides the basic
methods to locate common faults of
RAN
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Chapter 1 Troubleshooting OverviewChapter 1 Troubleshooting Overview
Chapter 2 Interface TroubleshootingChapter 2 Interface Troubleshooting
Chapter 3 Cell TroubleshootingChapter 3 Cell Troubleshooting
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Troubleshooting Overview
General Flows of Troubleshooting
Start
End
Collect faultinformation
Locate the fault
Definite the fault
Clear the fault
Verify the fault
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Troubleshooting Overview
Step 1: Information collection:
Information Item Collection Method
Fault symptoms, as well as the occurrence
time, place, frequency Consult the customer service center
Running state of the equipment, operations
and related results before the fault occurrence,
and measures taken afterwards
Consult the O&M staff
Alarms and associated alarms, states of board
indicators
Observe board indicators and alarm
management system on the LMT or
M2000
Area and impact of the fault
Perform service test, performance
measurement, and interface and
signaling tracing
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Troubleshooting Overview
Step 2: Fault Definition:
RAN faults
Loading faultsLoading faults
Service faultsService faults
Cell faultsCell faults
CS faultsCS faults
PS faultsPS faults
Interface link faultsInterface link faults
Clock faultsClock faults
RF performance faultsRF performance faults
Functional subsystem faultsFunctional subsystem faults
Access faultsAccess faults
Handover faultsHandover faults
O&M faultsO&M faults
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Troubleshooting Overview
Step 3: Fault Locating
Locating faults in the functional subsystem
− Troubleshoot these faults in compliance with the indicator information, alarm handli
ng suggestions, or error prompts
Locating faults in services
− For faults in voice services or packet switched services
− Check the Iu, Iub, and Uu interfaces
− Check the RNP/RNO parameters
− For faults in handover or access to the network
− Start the signaling tracing and comparing it with the protocols
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Troubleshooting Overview
Common Fault Location Methods
Alarm Analysis
Comparison or Replacement
Interface Signaling and User Tracing
Switch Over or Reset
Traffic Measurement
Test Analysis
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Troubleshooting Overview Step 4: Fault Clearing
Methods to clear the faults and recover the system
− Replacing the cables, replacing boards, updating configuration data,
switching over system and resetting boards
− Different procedures should be applied to different faults
Step 5: Fault Verifying
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 and methods for improvement
to avoid recurrence of the faults of the same type
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Chapter 1 Troubleshooting OverviewChapter 1 Troubleshooting Overview
Chapter 2 Interface TroubleshootingChapter 2 Interface Troubleshooting
Chapter 3 Cell TroubleshootingChapter 3 Cell Troubleshooting
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Interface Troubleshooting
Iub interface protocolIub interface protocol
Control Plane
Transport NetworkControl Plane
User planeRadioNetworkLayer
Q.AAL2
Transport Network User Plane
TransportNetworkLayer
Transport Network User Plane
NCP CCP
A B C
CCP
NBAP
SAAL UNI AAL2PATH
ATM
Physical Layer
Q.2150.2
Q.2630.1
SAAL UNISCTP
IP
DLL
FP
IP
DLL
UDP
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Interface Troubleshooting
Iu-CS interface protIu-CS interface protocolocol
Control Plane
Transport NetworkControl Plane
User planeRadioNetworkLayer
Q.AAL2
Transport Network User Plane
TransportNetworkLayer
Transport Network User Plane
A B C
RANAP
AAL2 PATH
ATM
Physical Layer
Q.2150.1Q.2630.1
SAAL NNI
SCCP
MTP3-B
A
Iu UP
SAAL NNI
MTP3-BB
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Interface Troubleshooting
Iu-PS interface protIu-PS interface protocolocol
Control Plane
Transport NetworkControl Plane
User planeRadioNetworkLayer
Transport Network User Plane
TransportNetworkLayer
Transport Network User Plane
A C
RANAP
ATM
SAAL NNI
SCCP
MTP3-B
A
Iu UP
B
AAL Type 5
IP
UDP
GTP-U
Physical Layer
ATM
Physical Layer
C
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Interface Troubleshooting
Alarms of Physical Layer Faults E1/T1 fault alarms
− ALM-1101 E1/T1 Loss of Signal
− ALM-1001 IMA Link Loss Of Frame
− ALM-1007 IMA/UNI Link Loss of Cell Delineation
− ALM-1011 IMA Group Activated Links Insufficient
STM-1 fault alarms
− ALM-901 Optical Port Loss of Signal
− ALM-903 Optical Port Loss of Frame
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Interface Troubleshooting
Alarms of Data Link Layer Faults FE fault alarms
− ALM-851 FE Link Down
− ALM-852 FE Link Send Defect Indication
PPP link alarms
− ALM-2602 PPP/MLPPP Link Down
− ALM-2604 MLPPP Group Down
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Interface Troubleshooting
Alarms of Signaling link Faults SAAL link alarms
− ALM-1801 SAAL (NNI) Link Alignment Failed
− ALM-1802 SAAL Link Unavailable SCTP link alarms
− ALM-1851 SCTP Link Down
− ALM-1852 SCTP link congest
MTP3-B link alarms
− ALM-1413 MTP-3b Signalling Link Unavailable
− ALM-1403 MTP-3b DSP Inaccessible
NCP/CCP alarms
− ALM-2010 NCP Faulty
− ALM-2011 CCP Faulty
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Interface Troubleshooting
Alarms of Control Plane Faults QAAL2 alarms
− ALM-1601 QAAL2 PDU Mandatory Parameters Absent
− ALM-1602 QAAL2 Receives Unknown Message
− ALM-1618 QAAL2 Protocol Version Mismatch
− ALM-1615 AAL2 Adjacent Node Unavailable
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Interface Troubleshooting
Alarms of User Plane Faults AAL2PATH alarms
− ALM-1603 AAL2 Path Blocked By Peer End
− ALM-1605 AAL2 Path Reset By Peer End
IP PATH alarms
− ALM-2606 IP PATH Down
GTP-U alarms
− ALM-1901 Path to SGSN Faulty
− ALM-1902 Link to SGSN Fault
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Interface Troubleshooting
Points of Processing Alarms 1, Alarms would be classified according to sources
2, Cell alarms may come from transport or hardware faults
3, Alarms in high layer come from the faults in lower layer in transport
4, Most alarms in transport come from physical faults
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Troubleshooting CaseUnavailable E1/T1 Physical Links
Symptom and Fault Definition
After you run the DSP E1T1 command on the RNC LMT to check the state of the E1/T1 links, Link running state is any of the following:
− Loss of Signal
ALM-1101 E1/T1 Loss Of Signal
− Loss of Frame
ALM-1102 E1/T1 Loss Of Frame
− Remote Alarm
ALM-1103 E1/T1 Remote Alarm Indication
− Loss of Multiple Frame
ALM-1105 E1/T1 Loss Of Multiframe
− Fault
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Troubleshooting CaseUnavailable E1/T1 Physical Links
Fault Locating and Clearing
If Link running state is one of those previous introduction except Fault, handle the fault according to the Alarm Handling in the online help
If the Link running state is Fault ,then do the loopback test of E1/T1 and recover the faulty E1/T1 cables
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Troubleshooting CaseUnavailable E1/T1 Physical Links Loopback test of E1/T1 from RNC
Step 1: local port loopback to check the E1/T1 ports in RNC
− SET E1T1LOP, LOP E1T1, SET E1T1LOP
Step 2: physical local loopback to check the local cables in RNC
− Connect the TX end with the RX end of the E1/T1 at the local end
− LOP E1T1
− Cancel the loopback at the local end
Step 3: physical remote loopback to check the transmission in RNC
− Connect the TX end with the RX end of the E1/T1 at the remote end
− LOP E1T1
− Cancel the loopback at the remote end
Step 4: remote port loopback to check the E1/T1 ports at the remote end
− SET E1T1LOP(peer end), LOP E1T1(RNC LMT), SET E1T1LOP(peer end)
Step 5:reset the IMA group
− RST IMAGRP
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TX
RX
TX
RX
Step 1: Local Loop Back>> SET E1T1LOP (Loop type=local)>> LOP E1T1 (Activate loop)>> SET E1T1LOP (Loop type=noloop)
Step 2: Physical local loop back>> LOP E1T1 (RNC LMT)
Loopback Test of E1/T1 from RNC
Troubleshooting CaseUnavailable E1/T1 Physical LinksTroubleshooting CaseUnavailable E1/T1 Physical Links
RNC
NodeB
Step 3: Physical remote loop back >> LOP E1T1 (RNC LMT)
Step 4: Remote Loop Back >> SET E1T1LOP (peer end:Loop type=remote)>> LOP E1T1 (RNC LMT:Activate loop)>> SET E1T1LOP (peer end:Loop type=noloop)
Step 5: Reset IMA group>> RST IMAGRP
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Troubleshooting CaseUnavailable E1/T1 Physical Links Loopback test of E1/T1 from NodeB
Step 1: local port loopback to check the E1/T1 ports in NodeB
− SET E1T1LOP, DSP E1T1, SET E1T1LOP
Step 2: physical local loopback to check the local cables in NodeB
− Connect the TX end with the RX end of the E1/T1 at the local end
− DSP E1T1
− Cancel the loopback at the local end
Step 3: physical remote loopback to check the transmission in NodeB
− Connect the TX end with the RX end of the E1/T1 at the remote end
− DSP E1T1
− Cancel the loopback at the remote end
Step 4: remote port loopback to check the E1/T1 ports at the remote end
− SET E1T1LOP(peer end), DSP E1T1(NodeB LMT), SET E1T1LOP(peer end)
Step 5:reset the IMA group
− RST IMAGRP
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TX
RX
TX
RX
Step 4: Remote Loop Back>> SET E1T1LOP (peer end:Loop type=remote)>> DSP E1T1 (NodeB LMT:Activate loop)>> SET E1T1LOP (peer end:Loop type=noloop)
Step 3: Physical remote loop back>> DSP E1T1 (NodeB LMT)
Loopback Test of E1/T1 from NodeB
Troubleshooting Case Unavailable E1/T1 Physical LinksTroubleshooting Case Unavailable E1/T1 Physical Links
RNC
NodeB
Step 2: Physical local loop back >> DSP E1T1 (NodeB LMT)
Step 1: Local Loop Back >> SET E1T1LOP (Loop type=local)>> DSP E1T1 (Activate loop)>> SET E1T1LOP (Loop type=noloop)
Step 5: Reset IMA group>> RST IMAGRP
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Chapter 1 Troubleshooting OverviewChapter 1 Troubleshooting Overview
Chapter 2 Interface TroubleshootingChapter 2 Interface Troubleshooting
Chapter 3 Cell TroubleshootingChapter 3 Cell Troubleshooting
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Cell Setup Procedure
NBAP_AUDIT_REQ
NBAP_AUDIT_RSP
NBAP_CELL_SETUP_REQ
NBAP_CELL_SETUP_RSP
NBAP_COMM_TRANSP_CH_SETUP_REQ
NBAP_COMM_TRANSP_CH_SETUP_RSP
NBAP_SYS_INFO_UPDATE_REQ
NBAP_SYS_INFO_UPDATE_RSP
LOCELL, CELL, CCP
CELL ID, Frequency,
Power
Setup Common
Channels :1 、 PRACH 、 AI
CH
2 、 SCCPCH 、PICH
NBAP_COMM_TRANSP_CH_SETUP_REQ
NBAP_COMM_TRANSP_CH_SETUP_RSP
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Cell Troubleshooting
Alarms of Cell Setup Failure ALM-2036 NodeB Audit No Rsp
ALM-2012 Cell Setup Failed
ALM-2014 Common Channel Setup Failed
ALM-2032 Cell Max DL power mismatch
ALM-2027 Cell HSDPA Setup Failed
ALM-2006 Cell Unavailable
ALM-2030 Cell HSDPA Unavailable
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Troubleshooting Case
Cell Setup Is Not Initiated After the Audit Process Ends
Fault Symptom and Definition
− Cell setup is not started after the audit process ends
Fault Locating
− Execute the LST CELL command
− The result shows that the cell data is available, so cell setup is all
owed
− The corresponding LocalCell ID can be obtained
− The NBAP_AUDIT_RSP message includes the corresponding LocalC
ell information. The max TX power supported by LocalCell is 370 (37
dBm)
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Troubleshooting Case
Cell Setup Is Not Initiated After the Audit Process End
Fault Locating
− Execute the LST CELL command. The result shows that th
e max TX power configured for the cell is 430 (43 dBm), wh
ich is greater than that supported by LocalCell. That is, the t
wo power settings are inconsistent
Fault Clearing and Verifying
It is checked that the max TX power 370 reported by the NodeB is correct
Reduce the max transmit power of the cell by MOD CELL and modify the power threshold of PCPICH by MOD PCPICHPWR in RNC LMT
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