RRC Setup Success Rate Improvement due to high L.RRC.SetupFail.NoReply in 4G LTE Huawei Network

Welcome back again to my blog. In this Article I would like to share about RRC Setup Success Rate Improvement in Worst performing cells (WPC) due to high rejection L.RRC.SetupFail.NoReply in 4G LTE Huawei. Rejection of  L.RRC.SetupFail.NoReply commonly due to coverage issue such as overshooting but I have experienced low RRC Setup Success Rate was due to low user(low sample) and the rejection still figure out by L.RRC.SetupFail.NoReply. Previously I was tried to clear up No reply by reset MRFU and swap MRFU to other sector (I thought may be because RF module problem because User's are very low) but still no improvement. I also did Physical tuning by down tilt Antenna 2 degree from previous configuration ( I thought may be due to coverage issue) and the result is nothing.Finally I get some improvement after reazimuth antenna and up tilt to get more user's.RRC setup success rate was improved,traffic increased and L.RRC.SetupFail.NoReply has cleared after reorientation and up tilt antenna.This action is working to improve RRC Setup Success Rate in cells with low user's(commonly L.Traffic.User.Avg less than 10).
Graph below is the result of RRC Setup Success Rate Improvement after Physical Optimization  ; Re-azimuth from 340 to 290 and  set  Total Tilt from 11 to 6 in 601116 sector-3.

From above chart Traffic and RRC setup SR have improved after Physical Optimization ; Re-azimuth from 340 to 290 and  set  Total Tilt from 11 to 6 on 15 November 2017,L.RRC.SetupFail.NoReply also decreased(improved). So in my opinion, here are the conclusion to improve RRC Setup Success Rate:

1. Check  number of user in counter L.Traffic.User.Avg, if less than 10 then try to reazimuth to potential coverage or up tilt to obtain more traffic.

2. Check TA coverage for cells with high number of user(L.Traffic.User.Avg>50),if found high TA then try reduce coverage by down tilt antenna(suspect low RRC setup SR due to overshooting).

3. Next action may be reset MRFU or try swap to other sector if suspect RF module issue.

If you have other solution or experienced in improving RRC Setup Success Rate,you can share or give feedback in comment,so will help other people in improving Network KPI.

You might also need to know:
4G-4G Traffic sharing for LTC(Low Throughput Cells) improvement in Huawei LTE
2G to 4G LTE Cell reselection Parameter setting in Huawei Network
Enable PS Redirection from 3G to 4G in Huawei Network
3G Call SetUp Time(CST) optimization by EFD state transition optimization in Huawei
3G UMTS/WCDMA Drop Call Rate Improvement(DCR CS/PS) in 3G Network Huawei
VQI Optimization Improvement by turn off Speech codec 5.9, 7.4 and 4.75 Kbps in Huawei 2G Network
VQI(Voice Quality Index) and Drop Call rate improvement in 2G Huawei by Setting more Full Rate and redimension channel
2G Theory and Concept
Common question about RF Optimization
TCH Block Rate Optimization Tips in Huawei GSM
2G Voice Quality Improvement by TRX Layering priority in Huawei GSM
TBF Drop Improvement tips in Huawei GSM
GPRS Packet Data Access Success Rate(PDASR) Improvement in Huawei GSM
Call Drop Rate improvement by Parameter change in 3G UMTS/WCDMA Huawei Network
Trial Power Control in GSM Huawei for Quality Improvement
Power Control activation for Electricity Saving in Huawei GSM
Handover Meaning in GSM and How to Optimize Handover Success Rate (HOSR) for GSM KPI Improvement
WCDMA CSSR Optimization Tips
CSSR Optimization for GSM and WCDMA
Drop Call Rate Optimization, How to identify and finding root cause for Optimization solution on GSM and UMTS Network

4G-4G Traffic sharing for LTC(Low Throughput Cells) improvement in Huawei LTE

In This Chapter I would like to share about LTC improvement by traffic sharing/offload traffic 4G-4G in Huawei 4G LTE. There are many way to improve throughput in 4G Huawei such as:Bandwidth Upgrade,Sharing traffic 4G-3G,sharing traffic 4G-4G(High traffic 4G cells to surroundings low traffic), Parameter adjustment such as:activate EPFENHANCEDSWITCH,Clearing overshooting,Upgrade transmission Capacity,Physical traffic sharing(antenna adjustment) and etc.

User DL Throughput will be improved by traffic sharing only if surroundings cells are in light load(not high traffic) because traffic shifting from cells with low throughput  to surroundings cells with low traffic and high throughput. Choose candidate cells for sharing traffic manually in map to maximize the result.Here are parameter setting that need to be set for 4G sharing traffic in Huawei LTE:

Parameter setting in cells LTC(Low Throughput cells):

Parameter setting in Candidate cells:

Script for Source_Congested cells:MOD EUTRANINTRAFREQNCELL: LocalCellId=XX, Mcc="YYY", Mnc="ZZ", eNodeBId=AA, CellId=BB, CellIndividualOffset=dB10, CellQoffset=dB-10, CellMeasPriority=HIGH_PRIORITY;  {NE Name}

Script for Target Non-Congested cells: MOD EUTRANINTRAFREQNCELL: LocalCellId=XX, Mcc="YYY", Mnc="ZZ", eNodeBId=AA, CellId=BB, CellIndividualOffset=dB-10, CellQoffset=dB10;  {NE NAME}

Fallback Script:

MOD EUTRANINTRAFREQNCELL: LocalCellId=XX, Mcc="YYY", Mnc="ZZ", eNodeBId=AA, CellId=BB, CellIndividualOffset=dB0, CellQoffset=dB0;  {NE NAME}

Here are the result after sharing traffic/offload 4G traffic to surroundings:

Mostly User DL throughput improved in cell level and traffic move to surroundings

Parameter Description:

CellIndividualOffset:

Indicates the cell individual offset for the inter-frequency neighboring cell, which is used in evaluation for handovers. It affects the probability of triggering inter-frequency measurement reports. A larger value of this parameter indicates a higher probability.

Impact on radio Network:

A larger value of this parameter results in a larger probability of triggering measurement reporting and handovers, increasing the number of handovers. A smaller value of this parameter results in the opposite effects. Whether the value of this parameter is too large or too small, the handover success rate decreases

CellQoffset:Indicates the offset for the inter-frequency neighboring cell, which is used in evaluation for cell reselections. A larger value of this parameter results in a lower probability of cell reselections. If this parameter is not set to dB0, it is delivered in SIB5. For details, see 3GPP TS 36.331. If this parameter is set to dB0, it is not delivered in SIB5. In this situation, UEs use 0 dB as the offset for cell reselections.

Impact on radio Network:

A larger value of this parameter leads to a lower probability of reselections to an inter-frequency neighboring cell. A smaller value leads to the opposite effects. Whether the value of this parameter is too large or too small, the access success rate of the inter-frequency neighboring cell decreases

CellMeasPriority:

Indicates the priority of measurement on the inter-frequency neighboring cell. The eNodeB preferentially contains the information about a neighboring cell with this priority set to HIGH_PRIORITY while delivering a measurement configuration

Impact on radio Network:

In the measurement configuration for an inter-frequency handover, the eNodeB includes information about a limited number of inter-frequency neighboring cells whose cell individual offsets (CIOs) are not zero. If this parameter is set to HIGH_PRIORITY and this neighboring cell has a non-zero CIO, it is more likely that this neighboring cell is included in the measurement configuration, thereby increasing the probability of a timely handover to this inter-frequency neighboring cell. If this neighboring cell is eventually not included in the measurement configuration, the UE uses zero as the CIO for this neighboring cell during handover evaluation, resulting in a delayed or premature handover to this neighboring cell.

Thank you for reading this chapter related Throughput improvement by 4G-4G Traffic sharing to solve LTC(low throughput cells) in Huawei 4G LTE Network, hope can helpful and improve your network.

You might also need to know:
2G to 4G LTE Cell reselection Parameter setting in Huawei Network
Enable PS Redirection from 3G to 4G in Huawei Network
3G Call SetUp Time(CST) optimization by EFD state transition optimization in Huawei
3G UMTS/WCDMA Drop Call Rate Improvement(DCR CS/PS) in 3G Network Huawei
VQI Optimization Improvement by turn off Speech codec 5.9, 7.4 and 4.75 Kbps in Huawei 2G Network
VQI(Voice Quality Index) and Drop Call rate improvement in 2G Huawei by Setting more Full Rate and redimension channel
2G Theory and Concept
Common question about RF Optimization
TCH Block Rate Optimization Tips in Huawei GSM
2G Voice Quality Improvement by TRX Layering priority in Huawei GSM
TBF Drop Improvement tips in Huawei GSM
GPRS Packet Data Access Success Rate(PDASR) Improvement in Huawei GSM
Call Drop Rate improvement by Parameter change in 3G UMTS/WCDMA Huawei Network
Trial Power Control in GSM Huawei for Quality Improvement
Power Control activation for Electricity Saving in Huawei GSM
Handover Meaning in GSM and How to Optimize Handover Success Rate (HOSR) for GSM KPI Improvement
WCDMA CSSR Optimization Tips
CSSR Optimization for GSM and WCDMA
Drop Call Rate Optimization, How to identify and finding root cause for Optimization solution on GSM and UMTS Network

2G to 4G LTE Cell reselection Parameter setting in Huawei Network

This post will tell you about Parameter setting related Cell re-selection from 2G to 4G LTE in Huawei Network. If you have new 4G network in your project and Inter working system 2G to 4G will be set properly, this post will be useful for you.Here are important parameter that need to  be set regarding 2G to 4G Cell reselection in Huawei Network.

-LTECELLRESELEN = YES(Enable Cell reselection GSM to LTE)
-GERANPRI =1(Cell reselection Priority LTE>UMTS>GSM)
-UTRANPRI =3(Cell reselection Priority LTE>UMTS>GSM)
-EUTRANPRI=6(Cell reselection Priority LTE>UMTS>GSM)
-THRUTRANHIGH=5
-UTRANQRXLEVMIN=2
-THREUTRANHIGH=9
-EUTRANQRXLEVMIN=6 (Minimum RSRP to camp on LTE)
-THREUTRANLOW=9
-QPEUTRAN=15

Description of all above parameter can be listed as below :
-LTECELLRESELEN:Whether to allow cell reselection from GSM to LTE cells. When this parameter is set to YES, cell reselection from GSM to LTE cells is allowed.
-GERANPRI:Common priority of GERAN. Value 0 indicates the lowest priority, and value 7 indicates the highest priority.
-UTRANPRI:Public priority of a neighboring UTRAN cell configured for an operator. Value 0 represents the lowest priority, value 7 represents the highest priority, and value 255 is invalid. This parameter corresponds to the DEFAULT_UTRAN_PRIORITY IE in SI23 in 3GPP TS 44.018.
The parameter value complies with the following rules:
1. If this parameter is set to a value other than 255, the parameter value is used.
2. If this parameter is set to 255, the value of [GCELLPRIEUTRANSYS:UTRANPRI] for the cell is used.
-EUTRANPRI:Public priority of a neighboring EUTRAN cell configured for an operator. Value 0 represents the lowest priority, value 7 represents the highest priority, and value 255 is invalid. This parameter corresponds to the DEFAULT_E-UTRAN_PRIORITY IE in SI23 in 3GPP TS 44.018.
The parameter value complies with the following rules:
1. If this parameter is set to a value other than 255, the parameter value is used.
2. If this parameter is set to 255, the value of [GCELLPRIEUTRANSYS:EUTRANPRI] for the cell is used.
-THRUTRANHIGH:High threshold of a neighboring UTRAN cell configured for an operator. When the measured RSCP/EcNo values of one or multiple neighboring UTRAN cells are higher than the threshold, UEs are allowed to reselect a neighboring UTRAN cell with a priority higher than that of a GERAN cell. This parameter corresponds to the THRESH_UTRAN_high IE in SI23 in 3GPP TS 44.018.
The mapping of parameter values onto actual values is:
0 = 0 dB,
1 = 2 dB,
2 = 4 dB,
3 = 6 dB,
...,
30 = 60 dB,
31 = 62 dB,
255 = invalid.
The parameter value complies with the following rules:
1. If this parameter is set to a value other than 255, the parameter value is used.
2. If this parameter is set to 255, the value of [GCELLPRIEUTRANSYS:THRUTRANHIGH] for the cell is used.
-UTRANQRXLEVMIN:Used to calculate the RSCP threshold for the target cell when a priority-based decision to perform GSM to UTRAN cell reselection is made.
The values of this parameter correspond to the following decibel values:
0: -119 dBm,
1: -117 dBm,
2: -115 dBm,
...,
30: -59 dBm,
31: -57 dBm.
-THREUTRANHIGH:High threshold of a neighboring EUTRAN cell configured for an operator. When the measured RSRP values of one or multiple neighboring EUTRAN cells are higher than the threshold, UEs are allowed to reselect a neighboring UTRAN cell with a priority higher than that of a GERAN cell. This parameter corresponds to the THRESH_E-UTRAN_high IE in SI23 in 3GPP TS 44.018.
The mapping of parameter values onto actual values is:
0 = 0 dB,
1 = 2 dB,
2 = 4 dB,
3 = 6 dB,
...,
30 = 60 dB,
31 = 62 dB,
255 = invalid.
The parameter value complies with the following rules:
1. If this parameter is set to a value other than 255, the parameter value is used.
2. If this parameter is set to 255, the value of [GCELLPRIEUTRANSYS:THREUTRANHIGH] for the cell is used.
-EUTRANQRXLEVMIN:Used to calculate the RSRP threshold for the target cell when a priority-based decision to perform GSM to EUTRAN cell reselection is made.
The values of this parameter correspond to the following decibel values:
0: -140 dBm,
1: -138 dBm,
2: -136 dBm,
...,
30: -80 dBm,
31: -78 dBm.
-THREUTRANLOW:Low threshold of a neighboring EUTRAN cell configured for an operator. A UE can reselect a neighboring EUTRAN cell that has a lower priority than the GERAN cell if the receive levels of the serving cell and all neighboring GSM cells are lower than the threshold specified by THRGSMLOW and the measured RSRP values of one or multiple neighboring EUTRAN cells are higher than the threshold. This parameter corresponds to the THRESH_E-UTRAN_low IE in SI23 in 3GPP TS 44.018.
The mapping of parameter values onto actual values is:
0 = 0 dB,
1 = 2 dB,
2 = 4 dB,
3 = 6 dB,
...,
30 = 60 dB,
31 = 62 dB,
255 = invalid.
The parameter value complies with the following rules:
1. If this parameter is set to a value other than 255, the parameter value is used.
2. If this parameter is set to 255, the value of [GCELLMOCNINTERRESEL:ThrEUTRANLow] is used. If the value of [GCELLMOCNINTERRESEL:ThrEUTRANLow] is 255, the value of [GCELLPRIEUTRANSYS:THREUTRANLOW] for the cell is used.
-QPEUTRAN:Threshold of signal level at which a mobile station starts to search for the target EUTRAN cell during cell reselection. In packet mode, if this parameter is set to a value lower than 7, the mobile station starts to search for an EUTRAN cell when the signal level of the serving cell is lower than the corresponding level threshold. If this parameter is set to a value higher than 7, the mobile station starts to search for an EUTRAN cell when the signal level of the serving cell is higher than the corresponding level threshold.

The values of this parameter correspond to the following decibel values:

0= -98dBm,

1= -94dBm,

2= -90dBm,
...,

7= (always), that is, the MS always searches for neighboring cells in EUTRAN.

8= -78dBm,

9= -74dBm,

10= -70dBm,
...,


14= -54dBm,

15= (never), that is, the MS never searches for neighboring cells in EUTRAN.

Those parameter are important parameter that need to be set in your network in order to enable cell re-selection 2G to 4G(LTE) in Huawei Network.Those parameter also need License, so be careful and check license first before implemented.

You might also need to know:

- Enable PS Redirection from 3G to 4G in Huawei Network

- 3G Call SetUp Time(CST) optimization by EFD state transition optimization in Huawei

- 3G UMTS/WCDMA Drop Call Rate Improvement(DCR CS/PS) in 3G Network Huawei

- VQI Optimization Improvement by turn off Speech codec 5.9, 7.4 and 4.75 Kbps in Huawei 2G Network

- VQI(Voice Quality Index) and Drop Call rate improvement in 2G Huawei by Setting more Full Rate and redimension channel

- 2G Theory and Concept

- Common question about RF Optimization

- TCH Block Rate Optimization Tips in Huawei GSM

- 2G Voice Quality Improvement by TRX Layering priority in Huawei GSM

- TBF Drop Improvement tips in Huawei GSM

- GPRS Packet Data Access Success Rate(PDASR) Improvement in Huawei GSM
- Call Drop Rate improvement by Parameter change in 3G UMTS/WCDMA Huawei Network

- Trial Power Control in GSM Huawei for Quality Improvement

- Power Control activation for Electricity Saving in Huawei GSM

- Handover Meaning in GSM and How to Optimize Handover Success Rate (HOSR) for GSM KPI Improvement

- WCDMA CSSR Optimization Tips

- CSSR Optimization for GSM and WCDMA

- Drop Call Rate Optimization, How to identify and finding root cause for Optimization solution on GSM and UMTS Network

Enable PS Redirection from 3G to 4G in Huawei Network

In this sharing, I would like to share you about how to Enable PS Redirection from 3G to 4G in Huawei Network. In The beginning of new 4G network in my project this kind activity would be done in Optimization activity. Here are some parameter in 3G that need to be created in CR (Change Request) regarding enabling PS Redirection from 3G to 4G LTE in Huawei Network.

//PS HO & redirection due to Load related
MOD UCELLLDR: CellId=xxx, DlLdr(Third)Action=PSInterU2LLDHO, UlLdr(Third)Action=PSInterU2LLDHO, UlPSU2LHOUeNum=1, DlPSU2LHOUeNum=1;(SET FOR LAST ACTION)

SET UCORRMALGOSWITCH: HoSwitch=HO_LTE_PS_OUT_SWITCH-1&HO_LTE_SERVICE_PS_OUT_SWITCH-1,HOSWITCH1=HO_U2L_COV_PS_REDIRECT_SWITCH-1&HO_U2L_LOAD_PS_REDIRECT_SWITCH-1;
MOD ULTENCELL: RNCId=xxx, CellId=xxx, LTECellIndex=xxx, BlindFlag=TRUE; (Colo Only)
MOD ULTECELL: LTECellIndex=xxx, SuppPSHOFlag=NotSupport;
SET UHOCOMM: U2LBlindRedirPingpongTimer=60;
MOD UCELLHOCOMM: CellId=xxx, U2LBlindRedirSwitch=ON;
MOD UTYPRABBASIC: RabIndex=xxx, EUTRANSHIND=HO_TO_EUTRAN_SHOULD_BE_PERFORM;(all RABINDEX for CNDOMAINID = PS_DOMAIN)

SET UU2LTEHOCOV: LTEReportMode=EVENT_TRIGGER, UsedFreqThdRSCP=-107, LTEMeasQuanOf3A=RSRP, Hystfor3A=4, TrigTime3A=D0, U2LTEFilterCoef=D3, U2LTEMeasTime=30, TargetRatThdRSRP=36,TargetRatThdRSRQ=20;
ADD UCELLU2LTEHOCOV: CellId=xxx, LTEReportMode=EVENT_TRIGGER, LTEMeasQuanOf3A=RSRP, UsedFreqThdRSCP=-107, Hystfor3A=4, TrigTime3A=D0, U2LTEFilterCoef=D3, U2LTEMeasTime=30,TargetRatThdRSRP=36, TargetRatThdRSRQ=20;

SET UU2LTEHONCOV:LTEMEASTYPOF3C=MeasurementQuantity, U2LTEFILTERCOEF=D6, U2LTEMEASTIME=30, LTEMEASQUANOF3C=RSRP, HYSTFOR3C=2, TRIGTIME3C=D10, TARGETRATTHDRSRP=20, TARGETRATTHDRSRQ=30, BESTCELLTRIGLTEMEASSWITCH=OFF, U2LPUNISHTIMER=5, U2LPUNISHSWITCH=ON, ANTIPINPANLTEFDDREDRSWITCH=OFF, U2LPHYCHFAILNUM=3, PENALTYTIMEFORPHYCHFAIL=30, U2LSERVMCTIMEOUTPUNISHTIME=60,U2LSERVTRIGSOURCE=U2L_SERV_RAB_SETUP_TRIGGER-0&U2L_SERV_LOWACTIVE_TRIGGER-1&U2L_SERV_PERIOD_TRIGGER-1&U2L_SERV_RB_REL_TRIGGER-0&U2L_SERV_IUCS_REL_TRIGGER-0&U2L_SERV_OTHER_TRIGGER-0,U2LSERVPRDTRIGTIMERLEN=10, U2LNCOVRSCPTHD=-90, U2LNCOVRSCPPRDTIMER=D2000, SIGTARGETRATTHDRSRP=36, SIGTARGETRATTHDRSRQ=20, U2LTESIGMEASTIME=3, U2LPUNISHTIMERLENFORLOAD=0;

ADD UCELLU2LTEHONCOV:CELLID=xxx, LTEMEASTYPOF3C=MeasurementQuantity, U2LTEFILTERCOEF=D6, U2LTEMEASTIME=30, LTEMEASQUANOF3C=RSRP, HYSTFOR3C=2, TRIGTIME3C=D10,TARGETRATTHDRSRP=20,TARGETRATTHDRSRQ=30, BESTCELLTRIGLTEMEASSWITCH=OFF, U2LSERVTRIGSOURCE=U2L_SERV_RAB_SETUP_TRIGGER-0&U2L_SERV_LOWACTIVE_TRIGGER-1&U2L_SERV_PERIOD_TRIGGER-0&U2L_SERV_RB_REL_TRIGGER-0&U2L_SERV_IUCS_REL_TRIGGER-0&U2L_SERV_OTHER_TRIGGER-0,U2LSERVALGOSWITCH=HO_LTE_SERVICE_PSHO_OUT_SWITCH-0&HO_LTE_SERVICE_PS_OUT_SWITCH-1&HO_LTE_SERVICE_NEED_RSCP_SWITCH-1&HO_LTE_SERVICE_BLIND_FIRST_SWITCH-0, U2LNCOVRSCPTHD=-90, U2LGRIDINFOLOWTHD=1, U2LGRIDINFOHIGHTHD=99;

SET UCORRMALGOSWITCH: HoSwitch1=HO_U2L_REDIR_BASED_ABSOLUTE_FREQ_SWITCH-1;
SET UCORRMALGOSWITCH: PsSwitch=PS_CMACTIVE_PROCESS_OPT_SWITCH-1;
SET UCORRMPARA: PerfEnhanceSwitch5=PERFENH_U2L_SERV_NOT_TRIG_WHEN_CSPAGING-1;
SET UCORRMPARA:PERFENHANCESWITCH2=PERFENH_CS_P2D_TRIG_SERVICE_U2L_SWITCH-0&PERFENH_RB_RECFG_TRIG_SERVICE_U2L_SWITCH-0;
SET UHOCOMM: U2LBlindRedirPingpongTimer=60;
ADD UCELLCMUSERNUM: CellId=xxx, U2LNCovPSCmUserNumThd=20;
SET UCORRMPARA: PerfEnhanceSwitch2=PERFENH_PERMIT_U2L_ONLY_UE_FROM_L_SWITCH-1;
SET UCORRMALGOSWITCH: HoSwitch1=HO_IUR_U2L_REDIR_SWITCH-0;
SET UCMCF: McHsdpaLteCMPermissionInd=FALSE;
SET UCORRMALGOSWITCH:HoSwitch1=HO_MC_LTE_NCELL_COMBINE_SWITCH-0;
SET UCORRMPARA: PerfEnhanceSwitch2=PERFENH_LTE_NCELL_SEL_OPT_SWITCH-1;
SET UCORRMPARA: PerfEnhanceSwitch5=PERFENH_U2L_PUNISH_HOLD_WHEN_DF2P_SWITCH-1;
SET UCORRMPARA: PerfEnhanceSwitch5=PERFENH_IUCS_REL_TRIG_U2L_SERV_OP_SWITCH-1;
SET UCORRMPARA: PerfEnhanceSwitch5=PERFENH_CM_STATE_FORBID_CHL_RETRY_SWITCH-1;

All Above Parameter command are important that need to be set in RNC and Cell level for enabling PS redirection from 3G to 4G in Huawei Network.

You might also need to know
- 3G Call SetUp Time(CST) optimization by EFD state transition optimization in Huawei
- 3G UMTS/WCDMA Drop Call Rate Improvement(DCR CS/PS) in 3G Network Huawei
- VQI Optimization Improvement by turn off Speech codec 5.9, 7.4 and 4.75 Kbps in Huawei 2G Network
- VQI(Voice Quality Index) and Drop Call rate improvement in 2G Huawei by Setting more Full Rate and redimension channel
- 2G Theory and Concept
- Common question about RF Optimization
- TCH Block Rate Optimization Tips in Huawei GSM
- 2G Voice Quality Improvement by TRX Layering priority in Huawei GSM
- TBF Drop Improvement tips in Huawei GSM
- GPRS Packet Data Access Success Rate(PDASR) Improvement in Huawei GSM
- Call Drop Rate improvement by Parameter change in 3G UMTS/WCDMA Huawei Network
- Trial Power Control in GSM Huawei for Quality Improvement
- Power Control activation for Electricity Saving in Huawei GSM
- Handover Meaning in GSM and How to Optimize Handover Success Rate (HOSR) for GSM KPI Improvement
- WCDMA CSSR Optimization Tips
- CSSR Optimization for GSM and WCDMA
- Drop Call Rate Optimization, How to identify and finding root cause for Optimization solution on GSM and UMTS Network

3G Call SetUp Time(CST) optimization by EFD state transition optimization in Huawei

In this Post I'm going to share about Call Set up Time(CST) Optimization in 3G by EFD(Enhanced Fast Dormancy) state transition Optimization in Huawei Network. The step is performed by modify RNC Parameter related EFD state transition by Choose P2F2D rather than P2D transition in CST(Call Set up Time).
P2F2D = PCH to FACH to DCH
P2D = PCH to DCH.

The Background of this activity:
- CS  Setup after P2D needs activation time, while P2F2D doesn’t need
- CS RB SETUP Message sent on DCH consumes more time than that on FACH.
(the signaling bit rate of DCH is 13.6Kbps, while the signaling bit rate of FACH is 25.6Kbps).

The step for this activity is just to activate and running command as below Script:
MML(R16):
SET URRCTRLSWITCH: OptimizationSwitch=CS_SETUP_P2D_SWITCH-0;
SET URRCTRLSWITCH: OptimizationSwitch4=RB_SETUP_F2D_USE_AM_RLC_SWITCH-1;

Based on trial in my project, CST improved from 8.8ms to 8.6ms(1%)

Please note this method of CST(Call Set up Time) optimization is not my initiation, but based on expert people in my project and already implemented all RNC's. Hope this post will be use full for you regarding Call Setup Optimization Time. Thanks.

You might also Need to know:
- 3G UMTS/WCDMA Drop Call Rate Improvement(DCR CS/PS) in 3G Network Huawei
- VQI Optimization Improvement by turn off Speech codec 5.9, 7.4 and 4.75 Kbps in Huawei 2G Network
- VQI(Voice Quality Index) and Drop Call rate improvement in 2G Huawei by Setting more Full Rate and redimension channel
- 2G Theory and Concept
- Common question about RF Optimization
- TCH Block Rate Optimization Tips in Huawei GSM
- 2G Voice Quality Improvement by TRX Layering priority in Huawei GSM
- TBF Drop Improvement tips in Huawei GSM
- GPRS Packet Data Access Success Rate(PDASR) Improvement in Huawei GSM
- Call Drop Rate improvement by Parameter change in 3G UMTS/WCDMA Huawei Network
- Trial Power Control in GSM Huawei for Quality Improvement
- Power Control activation for Electricity Saving in Huawei GSM
- Handover Meaning in GSM and How to Optimize Handover Success Rate (HOSR) for GSM KPI Improvement
- WCDMA CSSR Optimization Tips
- CSSR Optimization for GSM and WCDMA
- Drop Call Rate Optimization, How to identify and finding root cause for Optimization solution on GSM and UMTS Network

3G UMTS/WCDMA Drop Call Rate Improvement(DCR CS/PS) in 3G Network Huawei

Today I would like to share 3G UMTS/WCDMA Drop Call Rate Improvement in 3G Network Huawei. Some parameter for drop call rate improvement especially for CS service in 3G network need to adjust to improve DCR CS. Drop call in 3G network is one of KPI that need to be optimized especially when customer ask for KPI improvement on the Network. Parameter below can be implemented to improve drop call rate in 3G Network Huawei especially for CS service(DCR CS).

1. Enable CS_DISCONNECT_OPT_SWITCH 
2. Enable RRC_SCRI_NORM_REL_SWITCH

Description of each parameter:
- CS_DISCONNECT_OPT_SWITCH
Whether the RNC performs optimized processing if the UE does not respond within 3 seconds after receiving a DIRECT TRANSFER message from the CN during a CS call release. The value of the IE Message Type in the DIRECT TRANSFER message is Disconnect.
1: This switch is turned on. The RNC creates a DIRECT TRANSFER message and sends it to the CN. The value of the IE Message Type in the DIRECT TRANSFER message is Release.
0: This switch is turned off. The RNC does not create the DIRECT TRANSFER message

Script to enable this Switch:

SET URRCTRLSWITCH:IMPROVEMENTSWITCH=CS_DISCONNECT_OPT_SWITCH-1;

- RRC_SCRI_NORM_REL_SWITCH (Switch for Performing the Optimized RRC Connection Release Procedure on Receipt of a SIGNALLING CONNECTION RELEASE INDICATION Message)
1: This switch is turned on. The RNC initiated the normal release process after receive SIGNALLING CONNECTION RELEASE INDICATION message from UE.
0: This switch is turned off. The RNC does not handle SIGNALLING CONNECTION RELEASE INDICATION message during the process.

Script to enable this Switch:

SET URRCTRLSWITCH:PROCESSSWITCH2=RRC_SCRI_NORM_REL_SWITCH-1;

The other way to improve 3G DCR CS/PS in 3G UMTS/WCDMA Huawei  Network:

1. SHO Optimization (Recommended for Outer Cells)

- MOD UCELLINTRAFREQHO:RNCID=xxx,CELLID=xxx,SHOQUALMIN=-24;

- INTRARELTHDFOR1ACSNVP & INTRARELTHDFOR1BCSNVP = existing + 2

2. RL Power Optimization (Recommended for Cells with high Uu No Reply, Value adjust based on cells with high VS.RAB.FailEstabCS.UuNoReply)

- MOD UCELLRLPWR: CELLID=XXXXX, CNDOMAINID=CS_DOMAIN, MAXBITRATE=12200, RLMAXDLPWR=20, RLMINDLPWR=-140;

3.Radio Link Optimization (Recommended for RNC Level)

- SET UCORRMALGOSWITCH:MAPSWITCH=MAP_CSPS_RL_RESET_0K_LIMIT_SWITCH-1;

- SET UCORRMPARA:PERFENHANCESWITCH3=PERFENH_RLRESETUP_GUARANTEE_SWITCH-1,PERFENHANCESWITCH5=PERFENH_FACH_TVM_MC_TIME_OPT_SWITCH-1;

- SET URRCTRLSWITCH:PROCESSSWITCH4=RRC_CELLFACH_DL_TRB_RESET_TO_F2D_SWITCH-1,OPTIMIZATIONSWITCH6=ASU_RSP_FAIL_REL_UE-1&CS_TRIG_PS_F2D_SWITCH-1;

Graph below show the result of above parameter changes to improve Drop call rate(DCR CS/PS):

The result show significant improvement for Drop call rate in 3G Huawei network both DCR CS and DCR PS. For Other vendor(Nokia/Ericsson) you can find similar parameters or read parameter mapping between vendor.

You might also Need to know:

- VQI Optimization Improvement by turn off Speech codec 5.9, 7.4 and 4.75 Kbps in Huawei 2G Network

- VQI(Voice Quality Index) and Drop Call rate improvement in 2G Huawei by Setting more Full Rate and redimension channel

- 2G Theory and Concept

- Common question about RF Optimization

- TCH Block Rate Optimization Tips in Huawei GSM

- 2G Voice Quality Improvement by TRX Layering priority in Huawei GSM

- TBF Drop Improvement tips in Huawei GSM

- GPRS Packet Data Access Success Rate(PDASR) Improvement in Huawei GSM

- Call Drop Rate improvement by Parameter change in 3G UMTS/WCDMA Huawei Network

- Trial Power Control in GSM Huawei for Quality Improvement

- Power Control activation for Electricity Saving in Huawei GSM

- Handover Meaning in GSM and How to Optimize Handover Success Rate (HOSR) for GSM KPI Improvement

- WCDMA CSSR Optimization Tips

- CSSR Optimization for GSM and WCDMA

- Drop Call Rate Optimization, How to identify and finding root cause for Optimization solution on GSM and UMTS Network