SlideShare a Scribd company logo
1 of 46
HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com
Huawei Confidential
Security Level: INTERNAL
LTE IRAT
Troubleshooting Guide
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 2
Content
 Why IRAT
 Applications of IRAT
 Delivery Policies of IRAT
 Signaling Procedures of IRAT
 Definitions and Observation of IRAT KPIs
 IRAT Fault Diagnosis
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Why IRAT – 1
Page 3
Revenues(US$bn)
Global mobile voice vs data service
Source: Informa Telecoms & Media
 GSM, UMTS and, LTE will coexist for a long time.
 Voice service keeps creating huge revenue for operators.
 Main revenue growth will come from data services.
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Why IRAT – 2
Page 4
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 5
Content
 Why IRAT
 Applications of IRAT
 Delivery Policies of IRAT
 Signaling Procedures of IRAT
 Definitions and Observation of IRAT KPIs
 IRAT Fault Diagnosis
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Applications of IRAT
Page 6
1. An example of LTE & GSM interoperation is TMO of Germany.
2. Examples of LTE & UMTS interoperation are Bell of Canada,
eMobile of Japan, and Genius of Hong Kong.
3. An example of LTE, GSM, and UMTS interoperation is N4M of
Sweden.
Function requirements
a) UEs preferentially receive services from the LTE network for better user
experience.
b) The continuity of the LTE services is guaranteed.
c) The services and load are appropriately shared among the LTE, GSM, and
UMTS.
d) The network upgrade causes minimum impact on the network and users.
Performance requirements
a) The KPIs must be guaranteed, for example, IRAT handover success rate
and IRAT handover delay.
b) Users of high-speed data services receive services from preferably the LTE
for better user experience. Where the LTE is unavailable, the UMTS or
GSM is used.
c) Parameters are correctly set to improve the IRAT handover success rate,
lower the impact of a handover on the service, and prevent ping-pong
handovers.
d) Minimum LTE to UMTS/GSM handover delay is guaranteed. Users are
unaware of the service degradation caused by handovers.
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 7
Content
 Why IRAT
 Applications of IRAT
 Delivery Policies of IRAT
 Signaling Procedures of IRAT
 Definitions and Observation of IRAT KPIs
 IRAT Fault Diagnosis
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Delivery Policies of IRAT – Overall
Page 8
LTE/EP
C
GSM/UMTS
Mobility in idle mode
Mobility of PS services
Mobility of voice services
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Delivery Policies of IRAT – Overall
Page 9
LTE
UTRAN/GERA
N
Cell
reselection
to LTE
Cell reselection to
UTRAN/GERAN
UE moving into
LTE coverage
UE moving out of
LTE coverage
Camping priority:
LTE > UTRAN > GERAN
Broadcasted in
GERAN/UTRAN/LTE
Idle/PCH Mode
PS
handover/Redirection
to UTRAN/GERAN
UE moving into
LTE coverage
UE moving out of
LTE coverage
Connected Mode
CS Fallback to
UTRAN/GERAN by PS
handover/redirection
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Delivery Policies of IRAT – Idle Mode – 1
Page 10
Target :
 UEs preferentially reside in LTE except when the LTE cell has poor signal
quality.
 UE resides in the LTE cell even when the G/U cell has good signal quality.
Cell reselection from LTE to GSM/UMTS :
 The eNodeB is so configured that the priority of LTE cell
reselection is greater than that of GSM/UMTS cell reselection. If
the signal strength of the serving LTE cell is lower than the inter-
RAT measurement threshold, the GSM/UMTS measurement is
triggered. If the signal strength of the LTE cell is lower than the
serving-frequency low-priority reselection threshold and the signal
strength of the inter-RAT frequency is greater than the inter-RAT
frequency low-priority reselection threshold, the GSM/UMTS cell
reselection is triggered.
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Delivery Policies of IRAT – Idle Mode – 2
Page 11
Target :
 UEs preferentially reside in LTE except when the LTE cell has poor
signal quality.
 UEs reside in LTE cell even when the G/U cell has good signal quality.
L to G/U 小区重选 :
 在 eNodeB 配置 LTE 点的小区重 先 高于频 选优 级 GSM/UMTS ,
当 LTE 服 小区的信号低于 系 量 限触务 异 统测 门 发 GSM/UMTS 测
量,当 (LTE 小区信号 )<( 服 点低 先 重 限务频 优 级 选门 ) 并且 ( 异
系 信号统 )>( 系 点低 先 重 限异 统频 优 级 选门 ) 才会触 到发
GSM/UMTS 的小区重 。选
Cell reselection from GSM/UMTS to LTE:
 All LTE frequencies are configured on the BSC/RNC and the
priority of LTE cell reselection is greater than that of GSM/UMTS
cell reselection. After the UE returns to the idle or PCH mode
upon completion of a service in the GSM/UMTS network, the UE
periodically measures the LTE signal strength. If the signal
strength of the LTE cell is greater than the high-priority reselection
threshold configured on the BSC/RNC, the LTE cell reselection is
triggered.
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Delivery Policies of IRAT – Connected Status
 Events and meaning related to the LTE system
Page 12
Event Type Meaning
A1 Serving becomes better than threshold
A2 Serving becomes worse than threshold
A3 Neighbor becomes offset better than serving
A4 Neighbor becomes better than threshold
A5
Serving becomes worse than threshold and neighbor becomes better
than threshold2
B1 Inter RAT neighbor becomes better than threshold
B2
Serving becomes worse than threshold and inter RAT neighbor
becomes better than threshold2
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Delivery Policies of IRAT – Connected Status
 Coverage-based: When a UE moves out of the LTE coverage, the
LTE signal worsens. After the UE reports event A2, the eNodeB
determines whether the UE supports inter-RAT measurement.

If the UE supports inter-RAT measurement, the eNodeB delivers the
inter-RAT measurement control. After the UE reports inter-RAT
measurement event B1, the inter-RAT PS handover or redirection is
triggered. If both the UE and network support PS handover, PS
handover is preferred to obtain shorter service interruption. If the
operator does not want to upgrade the GERAN/UTRAN to support PS
handover or the UE does not support PS handover, redirection is
performed. In this case, the PS handover switch must be turned off.

If the UE does not support inter-RAT measurement, the eNodeB
performs the UMTS blind redirection triggered by event A2.
Page 13
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Delivery Policies of IRAT – Voice Service
 Before the IMS becomes mature, CSFB is a solution for providing
voice service over the LTE system. When the UE performs a
mobile-originated or mobile-terminated voice service over the
LTE, the CSFB works as follows:

If the UE supports inter-RAT measurement, the eNodeB delivers the
inter-RAT measurement control. After the UE reports inter-RAT
measurement event B1, CSFB based on inter-RAT PS handover or
redirection is triggered. If both the UE and network support PS
handover, PS handover is preferred to obtain shorter service
interruption. If the operator does not want to upgrade the
GERAN/UTRAN to support PS handover or the UE does not support
PS handover, redirection is performed. In this case, the PS handover
switch must be turned off.

If the UE does not support inter-RAT measurement, the CSFB is
based on inter-RAT blind redirection.
Page 14
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 15
Content
 Why IRAT
 Applications of IRAT
 Delivery Policies of IRAT
 Signaling Procedures of IRAT
 Definitions and Observation of IRAT KPIs
 IRAT Fault Diagnosis
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
IRAT Signaling Procedure – Reselection
Page 16
Reselection procedure
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
IRAT Signaling Procedure – Reselection
Page 17
Signaling procedure of the UE
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
IRAT Signaling Procedure - Redirection
Page 18
 The eNodeB sends RRC CONNECTION RELEASE to UE with IE:
RedirectedCarrierInfo including UMTS or GERAN carrier frequency.
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
IRAT Signaling Procedure – Redirection
Page 19
Measurement control
Measurement report
Redirect command
Redirected
frequency
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
IRAT Signaling Procedure – PS Handover
Page 20
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
IRAT Signaling Procedure – PS Handover
Page 21
A1/A2 measurement control
A2 measurement
report
B1 measurement
control
B1 measurement report
Handover command, instructing the
UE to hand over to the inter-RAT
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
IRAT Signaling Procedure – Redirection-
based CSFB
Page 22
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
IRAT Signaling Procedure – CSFB
Based on PS Handover
Page 23
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 24
Content
 Why IRAT
 Applications of IRAT
 Delivery Policies of IRAT
 Signaling Procedures of IRAT
 Definitions and Observation of IRAT KPIs
 IRAT Fault Diagnosis
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Definitions and Observation of IRAT KPIs
Page 25
KPI Meaning
L2U redirection control-
plane delay
From reception of RRC CONN REL on the LTE to transmission of
RRC CONN REQ on the UMTS
L2G redirection control-
plane delay
From reception of RRC CONN REL on the LTE to transmission of
Channel Request on the GERAN.
PSHO control-plane delay
From reception of Handover Command to reply of Handover
Complete
CSFB voice service setup
delay
From transmission of Extend Service Request to reception or
transmission of the Alerting message on the UMTS/GERAN
User-plane interruption
delay (uplink)
Average E2E IP-layer interruption delay. Observed on the FTP
server. From reception of the last data packet on the LTE to
reception of the first data packet on the UMTS/GERAN
User-plane interruption
delay (downlink)
Average E2E IP-layer interruption delay. Observed on the UE. From
reception of the last data packet on the LTE to reception of the first
data packet on the UMTS/GERAN
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Definitions and Observation of IRAT
KPIs – QXDM
Page 26
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Definitions and Observation of IRAT KPIs - Probe
 The CSFB KPIs, including CS setup delay and success rate, can
be observed on the Probe/Assistant.
Page 27
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 28
Content
 Why IRAT
 Applications of IRAT
 Delivery Policies of IRAT
 Signaling Procedures of IRAT
 Definitions and Observation of IRAT KPIs
 IRAT Fault Diagnosis
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 29
Common Problems of LTE IRAT
Type Common Problem
Capability Support
IRAT not supported by UE
IRAT not supported by GSM or UMTS BTS version
IRAT not supported by core network version
Parameter
Configuration
eNodeB IRAT switch not turned on
Inter-RAT neighboring cell not configured or incorrectly
configured
Core network interface not configured or incorrectly configured
Interference
Coverage
Large interference
Poor quality of the Uu interface
Known Problem
Known bugs of earlier eNodeB versions
Known bugs of the core network
Known bugs of the UE
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
IRAT Troubleshooting Flowchart
Page 30
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Discover a Problem
Page 31
 Understand the scenario of the problem.
 Check each signaling procedure to determine where the problem
occurs.
eRAN 2.1 provides performance statistics for only L2U, L2G, and L2C outgoing
handovers for calculating the handover success rate. eRAN3.0 provides additional
performance statistics for redirection and CSFB. For details, see the performance
indexes of eRAN3.0.
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
IRAT Troubleshooting Flowchart
Page 32
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Determining the UE Capability
Page 33
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
IRAT Troubleshooting Flowchart
Page 34
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
IRAT Parameter Configuration – Reselection
 The following command configures the LTE cell reselection priority and parameters:
MOD CELLRESEL: LocalCellId=0, SNonIntraSearchCfgInd=CFG,
SNonIntraSearch=8, ThrshServLow=7, CellReselPriority=6;
where CellReselPriority indicates the LTE cell reselection priority and
SnonInterSearch indicates the time that the UE starts the inter-RAT measurement.
CellReselPriority ranges from 0 to 7. To let the UE preferentially reside in the LTE
system, this parameter is set to a high value.
 The following command configures the UMTS frequency and reselection priority:
ADD UTRANNFREQ: LocalCellId=0, UtranDlArfcn=2825,
UtranFddTddType=UTRAN_FDD, UtranUlArfcnCfgInd=NOT_CFG,
CellReselPriorityCfgInd=CFG, CellReselPriority=3, ThreshXLow=6;
where UTRANDLARFCN indicates the UMTS downlink frequency and
CELLRESELPRIORITY indicates the UMTS cell reselection priority ranging from 0 to 7.
If the LTE signal quality is less than ThrshServLow and the UMTS signal quality is
greater than ThreshXLow, the UE reselects the UMTS.
 The following command adds the UMTS cell reselection information:
ADD CELLRESELUTRAN: LocalCellId=0, SpeedStateSfCfgInd=NOT_CFG;
After this command is configured, the SIB6 can be delivered.
Page 35
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
IRAT Parameter Configuration –
Redirection and Handover
 The following command adds the UMTS frequency:
ADD
UTRANNFREQ:LOCALCELLID=0,UTRANDLARFCN=2825,UTRANFDDTDDTYPE=UTRAN_FDD,UTRANULARFC
NCFGIND=NOT_CFG,CELLRESELPRIORITYCFGIND=CFG,CELLRESELPRIORITY=3;
where UTRANDLARFCN indicates the UMTS downlink frequency.
 The following command adds the UMTS external cell:
ADD
UTRANEXTERNALCELL:MCC="460",MNC="00",UTRANCELLID=18,UTRANDLARFCN=2825,UTRANULARF
CNCFGIND=NOT_CFG,RNCID=20,RACCFGIND=CFG,RAC=5,PSCRAMBCODE=18,LAC=3;
where RACCFGIND and RAC are mandatory for PS handovers.
 The following command adds the UMTS neighboring relationship:
ADD UTRANNCELL:LOCALCELLID=0,MCC="460",MNC="00",UTRANCELLID=18,BLINDHOPRIORITY=5;
where BLINDHOPRIORITY indicates the priority of the blind handover and blind redirection and has 32
values. The value has a positive correlation with the priority. Value 0 indicates that blind handover is
prohibited. A non-zero value must not be duplicate with the value of existing neighboring cell of the same type
in the local cell.
 The following command configures the handover and redirection switches:
ADD MOD ENODEBALGOSWITCH: HoModeSwitch=UtranPsHoSwitch-1&UtranRedirectSwitch-1;
If both the UtranPsHoSwitch and UtranRedirectSwitch are turned on, the former has a higher priority.
 The following commands configure the handover and redirection thresholds:
MOD
INTERRATHOCOMMGROUP:LOCALCELLID=0,INTERRATHOCOMMGROUPID=0,INTERRATHOA1THDRSRP=-
111,INTERRATHOA2THDRSRP=-115;
MOD INTERRATHOUTRANGROUP: LocalCellId=0, InterRatHoUtranGroupId=0,
InterRatHoUtranB1ThdRscp=-103;
where the INTERRATHOCOMMGROUPID and InterRatHoUtranGroupId of a QCI are queried by running
the LST CELLSTANDARDQCI. These two parameters are used to set the coverage-based inter-RAT A1, A2,
and UTRAN B1 thresholds.
Page 36
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
IRAT Parameter Configuration – CSFB
 For the command to add UMTS neighboring cells for CSFB, see the ADD
UTRANNFREQ, ADD UTRANEXTERNALCELL, and ADD UTRANNCELL commands
described in the previous page.
 The following command configures the CSFB switch:
MOD ENODEBALGOSWITCH: HoAlgoSwitch=UtranCsfbSwitch-1;
This command configures UtranCsfbSwitch for CSFB to UMTS.
CSFB can be PSHO-based or redirection-based, if UtranPsHoSwitch or
UtranRedirectSwitch is turned on, respectively. These two parameter are configured by the
ADD MOD ENODEBALGOSWITCH command, as described in the previous page.
 The following command configures the blind handover switch for CSFB:
MOD ENODEBALGOSWITCH: HoModeSwitch=BlindHoSwitch-1;
 The following command configures the RAT priority for blind CSFB:
MOD
CSFALLBACKBLINDHOCFG:CNOPERATORID=0,INTERRATHIGHESTPRI=UTRAN,INTERRAT
SECONDPRI=GERAN;
During a blind CSFB, the RAT of highest priority is selected, and then the highest-priority cell
of the highest-priority RAT is selected for blind handover or redirection.
 The following command configures the CSFB threshold:
MOD CSFALLBACKHO:LOCALCELLID=0,CSFBHOUTRANB1THDRSCP=-103;
This command configures the B1 threshold for CSFB.
Page 37
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
IRAT Troubleshooting Flowchart
Page 38
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Known Problem
For details, see eRAN2.1 FDD LTE Fault Diagnosis Guide –
Inter-RAT section 6.3. This section will be periodically
refreshed to contain the latest common problems.
Page 39
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
IRAT Troubleshooting Flowchart
Page 40
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Collecting Log
• Uu interface trace, S1 interface trace
• One-click log of the main control board
• GSM and UMTS user trace
• UE log (QXDM and Probe)
• Core network log
Page 41
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Case Study – 1
• In a test, the eNodeB does not deliver the L2G redirect command. However,
the L2U redirect test is normal.
• Diagnosis
The UE capability is queried. The result shows that the UE does not support
GERAN. According to 3GPP TS 36.331, the eNodeB does not deliver the L2G
redirect command. Our recommendation is that the testing engineer should
obtain the UE that supports the GSM band to test the L2G redirect command
again.
Page 42
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Case Study – 2
• During a test of the LTE PS service, after the CSFB is
initiated, the PS service does not fall back to the UMTS but is
interrupted.
• Diagnosis
The trace result shows that the LTE eNodeB processes the
redirection-based CSFB normally. After delivering the redirect
command, the eNodeB releases the UE. The UE initiates the RAU
procedure in the UMTS network, but the RAU procedure is rejected
with the cause value "MS identity can not be derived by the network".
The SGSN engineer explains that this problem is most likely caused
by the DNS configuration error. After the testing engineer modifies
the DNS configuration on the SGSN, the problem is solved.
Page 43
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Case Study – 3
• In a test, the HTC UE is used to perform the L2U CSFB. The core network
delivers the CSFB indication but the eNodeB does not respond. The CSFB
fails.
• Diagnosis
The standard interface trace result shows that the eNodeB does not process
the CSFB indication received from the core network. The UE capability and
inter-RAT configuration on the eNodeB are queried and the results show no
problem. The one-click logs returned by the testing engineers show that on
December 20, an operation to delete the UTRAN neighboring cell was
performed and on December 23, an operation to add the UTRAN neighboring
cell was performed. The problem occurred on December 21, when the
UTRAN neighboring cell was missing. Therefore, the eNodeB does not
process the L2U CSFB indication.
Page 44
HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential
Case Study – 4
• In a test of coverage-based L2G blind redirection, the Samsung UE cannot perform the
redirection.
• Diagnosis
The UE capability and eNodeB configuration are queried and the result shows no
problem. The logs show no problem. The DTS database is queried and the result shows
that the problem is similar to the following problem described in the DTS database:
DTS2011110702473 [LTE_eRAN2.1_Inter-RAT redirection] The UE does not support
GSM and UMTS measurement. If the GERAN redirection switch is turned on and the
local cell ID is non-zero, the blind redirection to GERAN fails.
The eNodeB configuration is queried and the result shows that the local cell ID is 1. After
the local cell ID is changed to 0, the L2G redirection succeeds. This problem is solved in
SPC430.
Page 45
Thank you
www.huawei.com

More Related Content

What's hot

LTE Optimization-KPIs.pptx
LTE Optimization-KPIs.pptxLTE Optimization-KPIs.pptx
LTE Optimization-KPIs.pptxHasanBilalKhan
 
Huawei - Access failures troubleshooting work shop
Huawei - Access failures troubleshooting work shopHuawei - Access failures troubleshooting work shop
Huawei - Access failures troubleshooting work shopnavaidkhan
 
2 drive test analysis ver1
2 drive test analysis ver12 drive test analysis ver1
2 drive test analysis ver1Virak Sou
 
Ericsson optimization opti
Ericsson optimization optiEricsson optimization opti
Ericsson optimization optiTerra Sacrifice
 
2 g training optimization
2 g training optimization2 g training optimization
2 g training optimizationAhmed Gad
 
2 g and 3g kpi improvement by parameter optimization (nsn, ericsson, huawei) ...
2 g and 3g kpi improvement by parameter optimization (nsn, ericsson, huawei) ...2 g and 3g kpi improvement by parameter optimization (nsn, ericsson, huawei) ...
2 g and 3g kpi improvement by parameter optimization (nsn, ericsson, huawei) ...Jean de la Sagesse
 
E2 e+call+setup+time+(cst)+enhacenments p3_benchmarking
E2 e+call+setup+time+(cst)+enhacenments p3_benchmarkingE2 e+call+setup+time+(cst)+enhacenments p3_benchmarking
E2 e+call+setup+time+(cst)+enhacenments p3_benchmarkingOtseakemhe
 
Call Setup Success Rate Definition and Troubleshooting
Call Setup Success Rate Definition and Troubleshooting Call Setup Success Rate Definition and Troubleshooting
Call Setup Success Rate Definition and Troubleshooting Assim Mubder
 
Top 10 3 G Radio Optimisation Actions
Top 10 3 G Radio Optimisation ActionsTop 10 3 G Radio Optimisation Actions
Top 10 3 G Radio Optimisation ActionsAbdul Muin
 
How to perform trouble shooting based on counters
How to perform trouble shooting based on countersHow to perform trouble shooting based on counters
How to perform trouble shooting based on countersAbdul Muin
 
Volte troubleshooting
Volte troubleshootingVolte troubleshooting
Volte troubleshootingJamil Awan
 
Sharing session huawei network optimization january 2015 ver3
Sharing session huawei network optimization january 2015 ver3Sharing session huawei network optimization january 2015 ver3
Sharing session huawei network optimization january 2015 ver3Arwan Priatna
 
Nokia gsm-kpi-analysis-based-on-daily-monitoring-basis-presentation
Nokia gsm-kpi-analysis-based-on-daily-monitoring-basis-presentationNokia gsm-kpi-analysis-based-on-daily-monitoring-basis-presentation
Nokia gsm-kpi-analysis-based-on-daily-monitoring-basis-presentationmohammed khairy
 
LTE Interference troubleshooting guide
LTE Interference troubleshooting guideLTE Interference troubleshooting guide
LTE Interference troubleshooting guideKlajdi Husi
 

What's hot (20)

Cs fallback feature
Cs fallback featureCs fallback feature
Cs fallback feature
 
LTE Optimization-KPIs.pptx
LTE Optimization-KPIs.pptxLTE Optimization-KPIs.pptx
LTE Optimization-KPIs.pptx
 
Cs fall back
Cs fall backCs fall back
Cs fall back
 
WCDMA Based Events
WCDMA Based EventsWCDMA Based Events
WCDMA Based Events
 
Huawei - Access failures troubleshooting work shop
Huawei - Access failures troubleshooting work shopHuawei - Access failures troubleshooting work shop
Huawei - Access failures troubleshooting work shop
 
2 drive test analysis ver1
2 drive test analysis ver12 drive test analysis ver1
2 drive test analysis ver1
 
Ericsson optimization opti
Ericsson optimization optiEricsson optimization opti
Ericsson optimization opti
 
2 g training optimization
2 g training optimization2 g training optimization
2 g training optimization
 
2 g and 3g kpi improvement by parameter optimization (nsn, ericsson, huawei) ...
2 g and 3g kpi improvement by parameter optimization (nsn, ericsson, huawei) ...2 g and 3g kpi improvement by parameter optimization (nsn, ericsson, huawei) ...
2 g and 3g kpi improvement by parameter optimization (nsn, ericsson, huawei) ...
 
E2 e+call+setup+time+(cst)+enhacenments p3_benchmarking
E2 e+call+setup+time+(cst)+enhacenments p3_benchmarkingE2 e+call+setup+time+(cst)+enhacenments p3_benchmarking
E2 e+call+setup+time+(cst)+enhacenments p3_benchmarking
 
Call Setup Success Rate Definition and Troubleshooting
Call Setup Success Rate Definition and Troubleshooting Call Setup Success Rate Definition and Troubleshooting
Call Setup Success Rate Definition and Troubleshooting
 
Part 2 planning of 3G
Part 2  planning of 3GPart 2  planning of 3G
Part 2 planning of 3G
 
Umts Kpi
Umts KpiUmts Kpi
Umts Kpi
 
Top 10 3 G Radio Optimisation Actions
Top 10 3 G Radio Optimisation ActionsTop 10 3 G Radio Optimisation Actions
Top 10 3 G Radio Optimisation Actions
 
Irat handover basics
Irat handover basicsIrat handover basics
Irat handover basics
 
How to perform trouble shooting based on counters
How to perform trouble shooting based on countersHow to perform trouble shooting based on counters
How to perform trouble shooting based on counters
 
Volte troubleshooting
Volte troubleshootingVolte troubleshooting
Volte troubleshooting
 
Sharing session huawei network optimization january 2015 ver3
Sharing session huawei network optimization january 2015 ver3Sharing session huawei network optimization january 2015 ver3
Sharing session huawei network optimization january 2015 ver3
 
Nokia gsm-kpi-analysis-based-on-daily-monitoring-basis-presentation
Nokia gsm-kpi-analysis-based-on-daily-monitoring-basis-presentationNokia gsm-kpi-analysis-based-on-daily-monitoring-basis-presentation
Nokia gsm-kpi-analysis-based-on-daily-monitoring-basis-presentation
 
LTE Interference troubleshooting guide
LTE Interference troubleshooting guideLTE Interference troubleshooting guide
LTE Interference troubleshooting guide
 

Similar to Lte irat-troubleshooting-guide

5.oep100330 lte cell_planning_issue1.10
5.oep100330 lte cell_planning_issue1.105.oep100330 lte cell_planning_issue1.10
5.oep100330 lte cell_planning_issue1.10Wijaya Kusuma
 
Examining Regulatory Environment in the Ethernet world
Examining Regulatory Environment in the Ethernet worldExamining Regulatory Environment in the Ethernet world
Examining Regulatory Environment in the Ethernet worldArief Gunawan
 
LTE Release 13 and SMARTER – Road Towards 5G
LTE Release 13 and SMARTER – Road Towards 5GLTE Release 13 and SMARTER – Road Towards 5G
LTE Release 13 and SMARTER – Road Towards 5GYi-Hsueh Tsai
 
Lte unlicensed coexistence
Lte unlicensed coexistenceLte unlicensed coexistence
Lte unlicensed coexistencessk
 
Huawei White Spaces E & V Band Technology
Huawei White Spaces E & V Band TechnologyHuawei White Spaces E & V Band Technology
Huawei White Spaces E & V Band TechnologyAdrian Hall
 
150154357 umts-multi-carrier-strategy-training-150514091047-lva1-app6892
150154357 umts-multi-carrier-strategy-training-150514091047-lva1-app6892150154357 umts-multi-carrier-strategy-training-150514091047-lva1-app6892
150154357 umts-multi-carrier-strategy-training-150514091047-lva1-app6892Walter Dono Miguel
 
150154357 umts-multi-carrier-strategy-training
150154357 umts-multi-carrier-strategy-training150154357 umts-multi-carrier-strategy-training
150154357 umts-multi-carrier-strategy-trainingمحمد مشعل
 
Day 1 LTE Technology Overview
Day 1 LTE Technology OverviewDay 1 LTE Technology Overview
Day 1 LTE Technology Overviewmahesh savita
 
393575910-318163030-E2E-VOLTE-pptx.pptx
393575910-318163030-E2E-VOLTE-pptx.pptx393575910-318163030-E2E-VOLTE-pptx.pptx
393575910-318163030-E2E-VOLTE-pptx.pptxLibaBali
 
454454778-07-LTE-Vodafone-Training-pdf.pdf
454454778-07-LTE-Vodafone-Training-pdf.pdf454454778-07-LTE-Vodafone-Training-pdf.pdf
454454778-07-LTE-Vodafone-Training-pdf.pdfMohamedShabana37
 
289271089-Training-for-LTE-Parameter-Planning-V3.pdf
289271089-Training-for-LTE-Parameter-Planning-V3.pdf289271089-Training-for-LTE-Parameter-Planning-V3.pdf
289271089-Training-for-LTE-Parameter-Planning-V3.pdfFrancescovanBeek1
 
An Introduction to Voice and SMS in LTE Networks
An Introduction to Voice and SMS in LTE NetworksAn Introduction to Voice and SMS in LTE Networks
An Introduction to Voice and SMS in LTE NetworkseXplanoTech
 
GOPALAKRISHNAN
GOPALAKRISHNANGOPALAKRISHNAN
GOPALAKRISHNANGOPALA46
 
Efficient Vertical Handoff Management in LTE Cellular Networks
Efficient Vertical Handoff Management in LTE Cellular NetworksEfficient Vertical Handoff Management in LTE Cellular Networks
Efficient Vertical Handoff Management in LTE Cellular NetworksIRJET Journal
 
Lte system signaling procedures
Lte system signaling proceduresLte system signaling procedures
Lte system signaling procedurestharinduwije
 
GPON-Fundamentals_Huawei.pdf
GPON-Fundamentals_Huawei.pdfGPON-Fundamentals_Huawei.pdf
GPON-Fundamentals_Huawei.pdfEnics
 
Migration to 5G and Deployment Training and certification by TELCOMA Global
Migration to 5G and Deployment Training and certification by TELCOMA GlobalMigration to 5G and Deployment Training and certification by TELCOMA Global
Migration to 5G and Deployment Training and certification by TELCOMA GlobalGaganpreet Singh Walia
 

Similar to Lte irat-troubleshooting-guide (20)

5.oep100330 lte cell_planning_issue1.10
5.oep100330 lte cell_planning_issue1.105.oep100330 lte cell_planning_issue1.10
5.oep100330 lte cell_planning_issue1.10
 
Examining Regulatory Environment in the Ethernet world
Examining Regulatory Environment in the Ethernet worldExamining Regulatory Environment in the Ethernet world
Examining Regulatory Environment in the Ethernet world
 
LTE - Huawei EMERSON EDUARDO RODRIGUES
LTE - Huawei EMERSON EDUARDO RODRIGUESLTE - Huawei EMERSON EDUARDO RODRIGUES
LTE - Huawei EMERSON EDUARDO RODRIGUES
 
LTE Release 13 and SMARTER – Road Towards 5G
LTE Release 13 and SMARTER – Road Towards 5GLTE Release 13 and SMARTER – Road Towards 5G
LTE Release 13 and SMARTER – Road Towards 5G
 
Lte unlicensed coexistence
Lte unlicensed coexistenceLte unlicensed coexistence
Lte unlicensed coexistence
 
Huawei White Spaces E & V Band Technology
Huawei White Spaces E & V Band TechnologyHuawei White Spaces E & V Band Technology
Huawei White Spaces E & V Band Technology
 
150154357 umts-multi-carrier-strategy-training-150514091047-lva1-app6892
150154357 umts-multi-carrier-strategy-training-150514091047-lva1-app6892150154357 umts-multi-carrier-strategy-training-150514091047-lva1-app6892
150154357 umts-multi-carrier-strategy-training-150514091047-lva1-app6892
 
150154357 umts-multi-carrier-strategy-training
150154357 umts-multi-carrier-strategy-training150154357 umts-multi-carrier-strategy-training
150154357 umts-multi-carrier-strategy-training
 
LTE Engg Seminar
LTE Engg SeminarLTE Engg Seminar
LTE Engg Seminar
 
Day 1 LTE Technology Overview
Day 1 LTE Technology OverviewDay 1 LTE Technology Overview
Day 1 LTE Technology Overview
 
393575910-318163030-E2E-VOLTE-pptx.pptx
393575910-318163030-E2E-VOLTE-pptx.pptx393575910-318163030-E2E-VOLTE-pptx.pptx
393575910-318163030-E2E-VOLTE-pptx.pptx
 
454454778-07-LTE-Vodafone-Training-pdf.pdf
454454778-07-LTE-Vodafone-Training-pdf.pdf454454778-07-LTE-Vodafone-Training-pdf.pdf
454454778-07-LTE-Vodafone-Training-pdf.pdf
 
289271089-Training-for-LTE-Parameter-Planning-V3.pdf
289271089-Training-for-LTE-Parameter-Planning-V3.pdf289271089-Training-for-LTE-Parameter-Planning-V3.pdf
289271089-Training-for-LTE-Parameter-Planning-V3.pdf
 
An Introduction to Voice and SMS in LTE Networks
An Introduction to Voice and SMS in LTE NetworksAn Introduction to Voice and SMS in LTE Networks
An Introduction to Voice and SMS in LTE Networks
 
GOPALAKRISHNAN
GOPALAKRISHNANGOPALAKRISHNAN
GOPALAKRISHNAN
 
Efficient Vertical Handoff Management in LTE Cellular Networks
Efficient Vertical Handoff Management in LTE Cellular NetworksEfficient Vertical Handoff Management in LTE Cellular Networks
Efficient Vertical Handoff Management in LTE Cellular Networks
 
Lte system signaling procedures
Lte system signaling proceduresLte system signaling procedures
Lte system signaling procedures
 
GPON-Fundamentals_Huawei.pdf
GPON-Fundamentals_Huawei.pdfGPON-Fundamentals_Huawei.pdf
GPON-Fundamentals_Huawei.pdf
 
PROJECT 2016-2017
PROJECT 2016-2017PROJECT 2016-2017
PROJECT 2016-2017
 
Migration to 5G and Deployment Training and certification by TELCOMA Global
Migration to 5G and Deployment Training and certification by TELCOMA GlobalMigration to 5G and Deployment Training and certification by TELCOMA Global
Migration to 5G and Deployment Training and certification by TELCOMA Global
 

More from Denmark Wilson

1.2 m hz networking for bcch trxs(gbss21.1 draft a)
1.2 m hz networking for bcch trxs(gbss21.1 draft a)1.2 m hz networking for bcch trxs(gbss21.1 draft a)
1.2 m hz networking for bcch trxs(gbss21.1 draft a)Denmark Wilson
 
Huawei rru5508 description
Huawei rru5508 descriptionHuawei rru5508 description
Huawei rru5508 descriptionDenmark Wilson
 
Info vista planet-5g nr
Info vista planet-5g nrInfo vista planet-5g nr
Info vista planet-5g nrDenmark Wilson
 
2015 trainingproposal forwcdma-project
2015 trainingproposal forwcdma-project2015 trainingproposal forwcdma-project
2015 trainingproposal forwcdma-projectDenmark Wilson
 
Airways hotel coverage improvement #1 15042015
Airways hotel coverage improvement #1 15042015Airways hotel coverage improvement #1 15042015
Airways hotel coverage improvement #1 15042015Denmark Wilson
 
To rs for number portability assignment finclean
To rs for number portability assignment fincleanTo rs for number portability assignment finclean
To rs for number portability assignment fincleanDenmark Wilson
 
Form sf2 nomination-form
Form sf2 nomination-formForm sf2 nomination-form
Form sf2 nomination-formDenmark Wilson
 

More from Denmark Wilson (8)

1.2 m hz networking for bcch trxs(gbss21.1 draft a)
1.2 m hz networking for bcch trxs(gbss21.1 draft a)1.2 m hz networking for bcch trxs(gbss21.1 draft a)
1.2 m hz networking for bcch trxs(gbss21.1 draft a)
 
Huawei rru5508 description
Huawei rru5508 descriptionHuawei rru5508 description
Huawei rru5508 description
 
Info vista planet-5g nr
Info vista planet-5g nrInfo vista planet-5g nr
Info vista planet-5g nr
 
2015 trainingproposal forwcdma-project
2015 trainingproposal forwcdma-project2015 trainingproposal forwcdma-project
2015 trainingproposal forwcdma-project
 
LTE Dimensioning
LTE DimensioningLTE Dimensioning
LTE Dimensioning
 
Airways hotel coverage improvement #1 15042015
Airways hotel coverage improvement #1 15042015Airways hotel coverage improvement #1 15042015
Airways hotel coverage improvement #1 15042015
 
To rs for number portability assignment finclean
To rs for number portability assignment fincleanTo rs for number portability assignment finclean
To rs for number portability assignment finclean
 
Form sf2 nomination-form
Form sf2 nomination-formForm sf2 nomination-form
Form sf2 nomination-form
 

Recently uploaded

Gravity concentration_MI20612MI_________
Gravity concentration_MI20612MI_________Gravity concentration_MI20612MI_________
Gravity concentration_MI20612MI_________Romil Mishra
 
Work Experience-Dalton Park.pptxfvvvvvvv
Work Experience-Dalton Park.pptxfvvvvvvvWork Experience-Dalton Park.pptxfvvvvvvv
Work Experience-Dalton Park.pptxfvvvvvvvLewisJB
 
Main Memory Management in Operating System
Main Memory Management in Operating SystemMain Memory Management in Operating System
Main Memory Management in Operating SystemRashmi Bhat
 
Python Programming for basic beginners.pptx
Python Programming for basic beginners.pptxPython Programming for basic beginners.pptx
Python Programming for basic beginners.pptxmohitesoham12
 
Correctly Loading Incremental Data at Scale
Correctly Loading Incremental Data at ScaleCorrectly Loading Incremental Data at Scale
Correctly Loading Incremental Data at ScaleAlluxio, Inc.
 
Comprehensive energy systems.pdf Comprehensive energy systems.pdf
Comprehensive energy systems.pdf Comprehensive energy systems.pdfComprehensive energy systems.pdf Comprehensive energy systems.pdf
Comprehensive energy systems.pdf Comprehensive energy systems.pdfalene1
 
Research Methodology for Engineering pdf
Research Methodology for Engineering pdfResearch Methodology for Engineering pdf
Research Methodology for Engineering pdfCaalaaAbdulkerim
 
Comparative study of High-rise Building Using ETABS,SAP200 and SAFE., SAFE an...
Comparative study of High-rise Building Using ETABS,SAP200 and SAFE., SAFE an...Comparative study of High-rise Building Using ETABS,SAP200 and SAFE., SAFE an...
Comparative study of High-rise Building Using ETABS,SAP200 and SAFE., SAFE an...Erbil Polytechnic University
 
Levelling - Rise and fall - Height of instrument method
Levelling - Rise and fall - Height of instrument methodLevelling - Rise and fall - Height of instrument method
Levelling - Rise and fall - Height of instrument methodManicka Mamallan Andavar
 
Module-1-(Building Acoustics) Noise Control (Unit-3). pdf
Module-1-(Building Acoustics) Noise Control (Unit-3). pdfModule-1-(Building Acoustics) Noise Control (Unit-3). pdf
Module-1-(Building Acoustics) Noise Control (Unit-3). pdfManish Kumar
 
Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...
Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...
Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...Sumanth A
 
Internship PPT ukai thermal power station .pptx
Internship PPT ukai thermal power station .pptxInternship PPT ukai thermal power station .pptx
Internship PPT ukai thermal power station .pptxmalikavita731
 
OOP concepts -in-Python programming language
OOP concepts -in-Python programming languageOOP concepts -in-Python programming language
OOP concepts -in-Python programming languageSmritiSharma901052
 
chpater16.pptxMMMMMMMMMMMMMMMMMMMMMMMMMMM
chpater16.pptxMMMMMMMMMMMMMMMMMMMMMMMMMMMchpater16.pptxMMMMMMMMMMMMMMMMMMMMMMMMMMM
chpater16.pptxMMMMMMMMMMMMMMMMMMMMMMMMMMMNanaAgyeman13
 
CCS355 Neural Networks & Deep Learning Unit 1 PDF notes with Question bank .pdf
CCS355 Neural Networks & Deep Learning Unit 1 PDF notes with Question bank .pdfCCS355 Neural Networks & Deep Learning Unit 1 PDF notes with Question bank .pdf
CCS355 Neural Networks & Deep Learning Unit 1 PDF notes with Question bank .pdfAsst.prof M.Gokilavani
 
TechTAC® CFD Report Summary: A Comparison of Two Types of Tubing Anchor Catchers
TechTAC® CFD Report Summary: A Comparison of Two Types of Tubing Anchor CatchersTechTAC® CFD Report Summary: A Comparison of Two Types of Tubing Anchor Catchers
TechTAC® CFD Report Summary: A Comparison of Two Types of Tubing Anchor Catcherssdickerson1
 
"Exploring the Essential Functions and Design Considerations of Spillways in ...
"Exploring the Essential Functions and Design Considerations of Spillways in ..."Exploring the Essential Functions and Design Considerations of Spillways in ...
"Exploring the Essential Functions and Design Considerations of Spillways in ...Erbil Polytechnic University
 
Novel 3D-Printed Soft Linear and Bending Actuators
Novel 3D-Printed Soft Linear and Bending ActuatorsNovel 3D-Printed Soft Linear and Bending Actuators
Novel 3D-Printed Soft Linear and Bending ActuatorsResearcher Researcher
 
Earthing details of Electrical Substation
Earthing details of Electrical SubstationEarthing details of Electrical Substation
Earthing details of Electrical Substationstephanwindworld
 

Recently uploaded (20)

Gravity concentration_MI20612MI_________
Gravity concentration_MI20612MI_________Gravity concentration_MI20612MI_________
Gravity concentration_MI20612MI_________
 
Work Experience-Dalton Park.pptxfvvvvvvv
Work Experience-Dalton Park.pptxfvvvvvvvWork Experience-Dalton Park.pptxfvvvvvvv
Work Experience-Dalton Park.pptxfvvvvvvv
 
Main Memory Management in Operating System
Main Memory Management in Operating SystemMain Memory Management in Operating System
Main Memory Management in Operating System
 
Python Programming for basic beginners.pptx
Python Programming for basic beginners.pptxPython Programming for basic beginners.pptx
Python Programming for basic beginners.pptx
 
Correctly Loading Incremental Data at Scale
Correctly Loading Incremental Data at ScaleCorrectly Loading Incremental Data at Scale
Correctly Loading Incremental Data at Scale
 
Comprehensive energy systems.pdf Comprehensive energy systems.pdf
Comprehensive energy systems.pdf Comprehensive energy systems.pdfComprehensive energy systems.pdf Comprehensive energy systems.pdf
Comprehensive energy systems.pdf Comprehensive energy systems.pdf
 
Research Methodology for Engineering pdf
Research Methodology for Engineering pdfResearch Methodology for Engineering pdf
Research Methodology for Engineering pdf
 
Comparative study of High-rise Building Using ETABS,SAP200 and SAFE., SAFE an...
Comparative study of High-rise Building Using ETABS,SAP200 and SAFE., SAFE an...Comparative study of High-rise Building Using ETABS,SAP200 and SAFE., SAFE an...
Comparative study of High-rise Building Using ETABS,SAP200 and SAFE., SAFE an...
 
Levelling - Rise and fall - Height of instrument method
Levelling - Rise and fall - Height of instrument methodLevelling - Rise and fall - Height of instrument method
Levelling - Rise and fall - Height of instrument method
 
Module-1-(Building Acoustics) Noise Control (Unit-3). pdf
Module-1-(Building Acoustics) Noise Control (Unit-3). pdfModule-1-(Building Acoustics) Noise Control (Unit-3). pdf
Module-1-(Building Acoustics) Noise Control (Unit-3). pdf
 
Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...
Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...
Robotics-Asimov's Laws, Mechanical Subsystems, Robot Kinematics, Robot Dynami...
 
Internship PPT ukai thermal power station .pptx
Internship PPT ukai thermal power station .pptxInternship PPT ukai thermal power station .pptx
Internship PPT ukai thermal power station .pptx
 
OOP concepts -in-Python programming language
OOP concepts -in-Python programming languageOOP concepts -in-Python programming language
OOP concepts -in-Python programming language
 
chpater16.pptxMMMMMMMMMMMMMMMMMMMMMMMMMMM
chpater16.pptxMMMMMMMMMMMMMMMMMMMMMMMMMMMchpater16.pptxMMMMMMMMMMMMMMMMMMMMMMMMMMM
chpater16.pptxMMMMMMMMMMMMMMMMMMMMMMMMMMM
 
CCS355 Neural Networks & Deep Learning Unit 1 PDF notes with Question bank .pdf
CCS355 Neural Networks & Deep Learning Unit 1 PDF notes with Question bank .pdfCCS355 Neural Networks & Deep Learning Unit 1 PDF notes with Question bank .pdf
CCS355 Neural Networks & Deep Learning Unit 1 PDF notes with Question bank .pdf
 
TechTAC® CFD Report Summary: A Comparison of Two Types of Tubing Anchor Catchers
TechTAC® CFD Report Summary: A Comparison of Two Types of Tubing Anchor CatchersTechTAC® CFD Report Summary: A Comparison of Two Types of Tubing Anchor Catchers
TechTAC® CFD Report Summary: A Comparison of Two Types of Tubing Anchor Catchers
 
"Exploring the Essential Functions and Design Considerations of Spillways in ...
"Exploring the Essential Functions and Design Considerations of Spillways in ..."Exploring the Essential Functions and Design Considerations of Spillways in ...
"Exploring the Essential Functions and Design Considerations of Spillways in ...
 
Designing pile caps according to ACI 318-19.pptx
Designing pile caps according to ACI 318-19.pptxDesigning pile caps according to ACI 318-19.pptx
Designing pile caps according to ACI 318-19.pptx
 
Novel 3D-Printed Soft Linear and Bending Actuators
Novel 3D-Printed Soft Linear and Bending ActuatorsNovel 3D-Printed Soft Linear and Bending Actuators
Novel 3D-Printed Soft Linear and Bending Actuators
 
Earthing details of Electrical Substation
Earthing details of Electrical SubstationEarthing details of Electrical Substation
Earthing details of Electrical Substation
 

Lte irat-troubleshooting-guide

  • 1. HUAWEI TECHNOLOGIES CO., LTD. www.huawei.com Huawei Confidential Security Level: INTERNAL LTE IRAT Troubleshooting Guide
  • 2. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 2 Content  Why IRAT  Applications of IRAT  Delivery Policies of IRAT  Signaling Procedures of IRAT  Definitions and Observation of IRAT KPIs  IRAT Fault Diagnosis
  • 3. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Why IRAT – 1 Page 3 Revenues(US$bn) Global mobile voice vs data service Source: Informa Telecoms & Media  GSM, UMTS and, LTE will coexist for a long time.  Voice service keeps creating huge revenue for operators.  Main revenue growth will come from data services.
  • 4. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Why IRAT – 2 Page 4
  • 5. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 5 Content  Why IRAT  Applications of IRAT  Delivery Policies of IRAT  Signaling Procedures of IRAT  Definitions and Observation of IRAT KPIs  IRAT Fault Diagnosis
  • 6. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Applications of IRAT Page 6 1. An example of LTE & GSM interoperation is TMO of Germany. 2. Examples of LTE & UMTS interoperation are Bell of Canada, eMobile of Japan, and Genius of Hong Kong. 3. An example of LTE, GSM, and UMTS interoperation is N4M of Sweden. Function requirements a) UEs preferentially receive services from the LTE network for better user experience. b) The continuity of the LTE services is guaranteed. c) The services and load are appropriately shared among the LTE, GSM, and UMTS. d) The network upgrade causes minimum impact on the network and users. Performance requirements a) The KPIs must be guaranteed, for example, IRAT handover success rate and IRAT handover delay. b) Users of high-speed data services receive services from preferably the LTE for better user experience. Where the LTE is unavailable, the UMTS or GSM is used. c) Parameters are correctly set to improve the IRAT handover success rate, lower the impact of a handover on the service, and prevent ping-pong handovers. d) Minimum LTE to UMTS/GSM handover delay is guaranteed. Users are unaware of the service degradation caused by handovers.
  • 7. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 7 Content  Why IRAT  Applications of IRAT  Delivery Policies of IRAT  Signaling Procedures of IRAT  Definitions and Observation of IRAT KPIs  IRAT Fault Diagnosis
  • 8. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Delivery Policies of IRAT – Overall Page 8 LTE/EP C GSM/UMTS Mobility in idle mode Mobility of PS services Mobility of voice services
  • 9. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Delivery Policies of IRAT – Overall Page 9 LTE UTRAN/GERA N Cell reselection to LTE Cell reselection to UTRAN/GERAN UE moving into LTE coverage UE moving out of LTE coverage Camping priority: LTE > UTRAN > GERAN Broadcasted in GERAN/UTRAN/LTE Idle/PCH Mode PS handover/Redirection to UTRAN/GERAN UE moving into LTE coverage UE moving out of LTE coverage Connected Mode CS Fallback to UTRAN/GERAN by PS handover/redirection
  • 10. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Delivery Policies of IRAT – Idle Mode – 1 Page 10 Target :  UEs preferentially reside in LTE except when the LTE cell has poor signal quality.  UE resides in the LTE cell even when the G/U cell has good signal quality. Cell reselection from LTE to GSM/UMTS :  The eNodeB is so configured that the priority of LTE cell reselection is greater than that of GSM/UMTS cell reselection. If the signal strength of the serving LTE cell is lower than the inter- RAT measurement threshold, the GSM/UMTS measurement is triggered. If the signal strength of the LTE cell is lower than the serving-frequency low-priority reselection threshold and the signal strength of the inter-RAT frequency is greater than the inter-RAT frequency low-priority reselection threshold, the GSM/UMTS cell reselection is triggered.
  • 11. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Delivery Policies of IRAT – Idle Mode – 2 Page 11 Target :  UEs preferentially reside in LTE except when the LTE cell has poor signal quality.  UEs reside in LTE cell even when the G/U cell has good signal quality. L to G/U 小区重选 :  在 eNodeB 配置 LTE 点的小区重 先 高于频 选优 级 GSM/UMTS , 当 LTE 服 小区的信号低于 系 量 限触务 异 统测 门 发 GSM/UMTS 测 量,当 (LTE 小区信号 )<( 服 点低 先 重 限务频 优 级 选门 ) 并且 ( 异 系 信号统 )>( 系 点低 先 重 限异 统频 优 级 选门 ) 才会触 到发 GSM/UMTS 的小区重 。选 Cell reselection from GSM/UMTS to LTE:  All LTE frequencies are configured on the BSC/RNC and the priority of LTE cell reselection is greater than that of GSM/UMTS cell reselection. After the UE returns to the idle or PCH mode upon completion of a service in the GSM/UMTS network, the UE periodically measures the LTE signal strength. If the signal strength of the LTE cell is greater than the high-priority reselection threshold configured on the BSC/RNC, the LTE cell reselection is triggered.
  • 12. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Delivery Policies of IRAT – Connected Status  Events and meaning related to the LTE system Page 12 Event Type Meaning A1 Serving becomes better than threshold A2 Serving becomes worse than threshold A3 Neighbor becomes offset better than serving A4 Neighbor becomes better than threshold A5 Serving becomes worse than threshold and neighbor becomes better than threshold2 B1 Inter RAT neighbor becomes better than threshold B2 Serving becomes worse than threshold and inter RAT neighbor becomes better than threshold2
  • 13. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Delivery Policies of IRAT – Connected Status  Coverage-based: When a UE moves out of the LTE coverage, the LTE signal worsens. After the UE reports event A2, the eNodeB determines whether the UE supports inter-RAT measurement.  If the UE supports inter-RAT measurement, the eNodeB delivers the inter-RAT measurement control. After the UE reports inter-RAT measurement event B1, the inter-RAT PS handover or redirection is triggered. If both the UE and network support PS handover, PS handover is preferred to obtain shorter service interruption. If the operator does not want to upgrade the GERAN/UTRAN to support PS handover or the UE does not support PS handover, redirection is performed. In this case, the PS handover switch must be turned off.  If the UE does not support inter-RAT measurement, the eNodeB performs the UMTS blind redirection triggered by event A2. Page 13
  • 14. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Delivery Policies of IRAT – Voice Service  Before the IMS becomes mature, CSFB is a solution for providing voice service over the LTE system. When the UE performs a mobile-originated or mobile-terminated voice service over the LTE, the CSFB works as follows:  If the UE supports inter-RAT measurement, the eNodeB delivers the inter-RAT measurement control. After the UE reports inter-RAT measurement event B1, CSFB based on inter-RAT PS handover or redirection is triggered. If both the UE and network support PS handover, PS handover is preferred to obtain shorter service interruption. If the operator does not want to upgrade the GERAN/UTRAN to support PS handover or the UE does not support PS handover, redirection is performed. In this case, the PS handover switch must be turned off.  If the UE does not support inter-RAT measurement, the CSFB is based on inter-RAT blind redirection. Page 14
  • 15. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 15 Content  Why IRAT  Applications of IRAT  Delivery Policies of IRAT  Signaling Procedures of IRAT  Definitions and Observation of IRAT KPIs  IRAT Fault Diagnosis
  • 16. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential IRAT Signaling Procedure – Reselection Page 16 Reselection procedure
  • 17. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential IRAT Signaling Procedure – Reselection Page 17 Signaling procedure of the UE
  • 18. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential IRAT Signaling Procedure - Redirection Page 18  The eNodeB sends RRC CONNECTION RELEASE to UE with IE: RedirectedCarrierInfo including UMTS or GERAN carrier frequency.
  • 19. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential IRAT Signaling Procedure – Redirection Page 19 Measurement control Measurement report Redirect command Redirected frequency
  • 20. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential IRAT Signaling Procedure – PS Handover Page 20
  • 21. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential IRAT Signaling Procedure – PS Handover Page 21 A1/A2 measurement control A2 measurement report B1 measurement control B1 measurement report Handover command, instructing the UE to hand over to the inter-RAT
  • 22. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential IRAT Signaling Procedure – Redirection- based CSFB Page 22
  • 23. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential IRAT Signaling Procedure – CSFB Based on PS Handover Page 23
  • 24. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 24 Content  Why IRAT  Applications of IRAT  Delivery Policies of IRAT  Signaling Procedures of IRAT  Definitions and Observation of IRAT KPIs  IRAT Fault Diagnosis
  • 25. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Definitions and Observation of IRAT KPIs Page 25 KPI Meaning L2U redirection control- plane delay From reception of RRC CONN REL on the LTE to transmission of RRC CONN REQ on the UMTS L2G redirection control- plane delay From reception of RRC CONN REL on the LTE to transmission of Channel Request on the GERAN. PSHO control-plane delay From reception of Handover Command to reply of Handover Complete CSFB voice service setup delay From transmission of Extend Service Request to reception or transmission of the Alerting message on the UMTS/GERAN User-plane interruption delay (uplink) Average E2E IP-layer interruption delay. Observed on the FTP server. From reception of the last data packet on the LTE to reception of the first data packet on the UMTS/GERAN User-plane interruption delay (downlink) Average E2E IP-layer interruption delay. Observed on the UE. From reception of the last data packet on the LTE to reception of the first data packet on the UMTS/GERAN
  • 26. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Definitions and Observation of IRAT KPIs – QXDM Page 26
  • 27. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Definitions and Observation of IRAT KPIs - Probe  The CSFB KPIs, including CS setup delay and success rate, can be observed on the Probe/Assistant. Page 27
  • 28. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 28 Content  Why IRAT  Applications of IRAT  Delivery Policies of IRAT  Signaling Procedures of IRAT  Definitions and Observation of IRAT KPIs  IRAT Fault Diagnosis
  • 29. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 29 Common Problems of LTE IRAT Type Common Problem Capability Support IRAT not supported by UE IRAT not supported by GSM or UMTS BTS version IRAT not supported by core network version Parameter Configuration eNodeB IRAT switch not turned on Inter-RAT neighboring cell not configured or incorrectly configured Core network interface not configured or incorrectly configured Interference Coverage Large interference Poor quality of the Uu interface Known Problem Known bugs of earlier eNodeB versions Known bugs of the core network Known bugs of the UE
  • 30. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential IRAT Troubleshooting Flowchart Page 30
  • 31. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Discover a Problem Page 31  Understand the scenario of the problem.  Check each signaling procedure to determine where the problem occurs. eRAN 2.1 provides performance statistics for only L2U, L2G, and L2C outgoing handovers for calculating the handover success rate. eRAN3.0 provides additional performance statistics for redirection and CSFB. For details, see the performance indexes of eRAN3.0.
  • 32. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential IRAT Troubleshooting Flowchart Page 32
  • 33. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Determining the UE Capability Page 33
  • 34. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential IRAT Troubleshooting Flowchart Page 34
  • 35. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential IRAT Parameter Configuration – Reselection  The following command configures the LTE cell reselection priority and parameters: MOD CELLRESEL: LocalCellId=0, SNonIntraSearchCfgInd=CFG, SNonIntraSearch=8, ThrshServLow=7, CellReselPriority=6; where CellReselPriority indicates the LTE cell reselection priority and SnonInterSearch indicates the time that the UE starts the inter-RAT measurement. CellReselPriority ranges from 0 to 7. To let the UE preferentially reside in the LTE system, this parameter is set to a high value.  The following command configures the UMTS frequency and reselection priority: ADD UTRANNFREQ: LocalCellId=0, UtranDlArfcn=2825, UtranFddTddType=UTRAN_FDD, UtranUlArfcnCfgInd=NOT_CFG, CellReselPriorityCfgInd=CFG, CellReselPriority=3, ThreshXLow=6; where UTRANDLARFCN indicates the UMTS downlink frequency and CELLRESELPRIORITY indicates the UMTS cell reselection priority ranging from 0 to 7. If the LTE signal quality is less than ThrshServLow and the UMTS signal quality is greater than ThreshXLow, the UE reselects the UMTS.  The following command adds the UMTS cell reselection information: ADD CELLRESELUTRAN: LocalCellId=0, SpeedStateSfCfgInd=NOT_CFG; After this command is configured, the SIB6 can be delivered. Page 35
  • 36. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential IRAT Parameter Configuration – Redirection and Handover  The following command adds the UMTS frequency: ADD UTRANNFREQ:LOCALCELLID=0,UTRANDLARFCN=2825,UTRANFDDTDDTYPE=UTRAN_FDD,UTRANULARFC NCFGIND=NOT_CFG,CELLRESELPRIORITYCFGIND=CFG,CELLRESELPRIORITY=3; where UTRANDLARFCN indicates the UMTS downlink frequency.  The following command adds the UMTS external cell: ADD UTRANEXTERNALCELL:MCC="460",MNC="00",UTRANCELLID=18,UTRANDLARFCN=2825,UTRANULARF CNCFGIND=NOT_CFG,RNCID=20,RACCFGIND=CFG,RAC=5,PSCRAMBCODE=18,LAC=3; where RACCFGIND and RAC are mandatory for PS handovers.  The following command adds the UMTS neighboring relationship: ADD UTRANNCELL:LOCALCELLID=0,MCC="460",MNC="00",UTRANCELLID=18,BLINDHOPRIORITY=5; where BLINDHOPRIORITY indicates the priority of the blind handover and blind redirection and has 32 values. The value has a positive correlation with the priority. Value 0 indicates that blind handover is prohibited. A non-zero value must not be duplicate with the value of existing neighboring cell of the same type in the local cell.  The following command configures the handover and redirection switches: ADD MOD ENODEBALGOSWITCH: HoModeSwitch=UtranPsHoSwitch-1&UtranRedirectSwitch-1; If both the UtranPsHoSwitch and UtranRedirectSwitch are turned on, the former has a higher priority.  The following commands configure the handover and redirection thresholds: MOD INTERRATHOCOMMGROUP:LOCALCELLID=0,INTERRATHOCOMMGROUPID=0,INTERRATHOA1THDRSRP=- 111,INTERRATHOA2THDRSRP=-115; MOD INTERRATHOUTRANGROUP: LocalCellId=0, InterRatHoUtranGroupId=0, InterRatHoUtranB1ThdRscp=-103; where the INTERRATHOCOMMGROUPID and InterRatHoUtranGroupId of a QCI are queried by running the LST CELLSTANDARDQCI. These two parameters are used to set the coverage-based inter-RAT A1, A2, and UTRAN B1 thresholds. Page 36
  • 37. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential IRAT Parameter Configuration – CSFB  For the command to add UMTS neighboring cells for CSFB, see the ADD UTRANNFREQ, ADD UTRANEXTERNALCELL, and ADD UTRANNCELL commands described in the previous page.  The following command configures the CSFB switch: MOD ENODEBALGOSWITCH: HoAlgoSwitch=UtranCsfbSwitch-1; This command configures UtranCsfbSwitch for CSFB to UMTS. CSFB can be PSHO-based or redirection-based, if UtranPsHoSwitch or UtranRedirectSwitch is turned on, respectively. These two parameter are configured by the ADD MOD ENODEBALGOSWITCH command, as described in the previous page.  The following command configures the blind handover switch for CSFB: MOD ENODEBALGOSWITCH: HoModeSwitch=BlindHoSwitch-1;  The following command configures the RAT priority for blind CSFB: MOD CSFALLBACKBLINDHOCFG:CNOPERATORID=0,INTERRATHIGHESTPRI=UTRAN,INTERRAT SECONDPRI=GERAN; During a blind CSFB, the RAT of highest priority is selected, and then the highest-priority cell of the highest-priority RAT is selected for blind handover or redirection.  The following command configures the CSFB threshold: MOD CSFALLBACKHO:LOCALCELLID=0,CSFBHOUTRANB1THDRSCP=-103; This command configures the B1 threshold for CSFB. Page 37
  • 38. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential IRAT Troubleshooting Flowchart Page 38
  • 39. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Known Problem For details, see eRAN2.1 FDD LTE Fault Diagnosis Guide – Inter-RAT section 6.3. This section will be periodically refreshed to contain the latest common problems. Page 39
  • 40. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential IRAT Troubleshooting Flowchart Page 40
  • 41. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Collecting Log • Uu interface trace, S1 interface trace • One-click log of the main control board • GSM and UMTS user trace • UE log (QXDM and Probe) • Core network log Page 41
  • 42. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Case Study – 1 • In a test, the eNodeB does not deliver the L2G redirect command. However, the L2U redirect test is normal. • Diagnosis The UE capability is queried. The result shows that the UE does not support GERAN. According to 3GPP TS 36.331, the eNodeB does not deliver the L2G redirect command. Our recommendation is that the testing engineer should obtain the UE that supports the GSM band to test the L2G redirect command again. Page 42
  • 43. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Case Study – 2 • During a test of the LTE PS service, after the CSFB is initiated, the PS service does not fall back to the UMTS but is interrupted. • Diagnosis The trace result shows that the LTE eNodeB processes the redirection-based CSFB normally. After delivering the redirect command, the eNodeB releases the UE. The UE initiates the RAU procedure in the UMTS network, but the RAU procedure is rejected with the cause value "MS identity can not be derived by the network". The SGSN engineer explains that this problem is most likely caused by the DNS configuration error. After the testing engineer modifies the DNS configuration on the SGSN, the problem is solved. Page 43
  • 44. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Case Study – 3 • In a test, the HTC UE is used to perform the L2U CSFB. The core network delivers the CSFB indication but the eNodeB does not respond. The CSFB fails. • Diagnosis The standard interface trace result shows that the eNodeB does not process the CSFB indication received from the core network. The UE capability and inter-RAT configuration on the eNodeB are queried and the results show no problem. The one-click logs returned by the testing engineers show that on December 20, an operation to delete the UTRAN neighboring cell was performed and on December 23, an operation to add the UTRAN neighboring cell was performed. The problem occurred on December 21, when the UTRAN neighboring cell was missing. Therefore, the eNodeB does not process the L2U CSFB indication. Page 44
  • 45. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Case Study – 4 • In a test of coverage-based L2G blind redirection, the Samsung UE cannot perform the redirection. • Diagnosis The UE capability and eNodeB configuration are queried and the result shows no problem. The logs show no problem. The DTS database is queried and the result shows that the problem is similar to the following problem described in the DTS database: DTS2011110702473 [LTE_eRAN2.1_Inter-RAT redirection] The UE does not support GSM and UMTS measurement. If the GERAN redirection switch is turned on and the local cell ID is non-zero, the blind redirection to GERAN fails. The eNodeB configuration is queried and the result shows that the local cell ID is 1. After the local cell ID is changed to 0, the L2G redirection succeeds. This problem is solved in SPC430. Page 45