Optimization Handbook

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LTE Optimization Handbook LA4.0

Document number: LTE/IRC/APP/032105

Document issue: V05.03 / ENDocument status: Approved-Standard

Data classification: ConfidentialDate: 30/Mar/2012

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LTE Optimization Handbook LA4.0 MGR /TIPS /NEA


LTE/IRC/APP/032105 V05.03 / EN Approved-Standard 30/Mar/2012 Page 2/194

1INTRODUCTION

The document is the optimization handbook for the main RF features and related parameters

per domain of Alcatel-Lucent LTE release LA4.0

The procedures detailed in this document can be used to improve the network performance

so that it meets contractual and technical objectives prior to a commercial launch. It can also

be used in a continuous process as the network evolves due to addition of new cells, increase

in traffic load or introduction of new features.

1.1SCOPE

Main purpose of the document consists of proposing parameter tuning that shall mitigateobserved performance degradations.

The following domains are distinguished for parameter tuning:

Coverage

Throughput

Latency

Capacity

Mobility (both connected and idle mode)

The parameters described in this document are related to the Alcatel-Lucent LTE

LA4.0 release.

1.2AUDIENCE FOR THIS DOCUMENT

The audience of this document is typically involved in following activities:

Radio Network Design

Radio Network Optimization

First-Off Trials

Commercial Network Deployment


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2PUBLICATION HISTORY

Version.Ed/

Language

Date

(dd.mmm.yyyy)

Status NameReason of changes / short description of

significant changes to previous edition

05.01/EN 04.Nov.2011 DraftJorgeSantos

Creation

05.02/EN 05.Dec.2011Approvedpreliminary

JorgeSantos

Reading Cycle Completed (DR4 Step)

05.03/EN 30.Mar.2012Approvedstandard

JorgeSantos

DR.5 milestone


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TABLE OF CONTENTS

1 INTRODUCTION ..................................................................................................................................... 2

1.1SCOPE .............................................................................................................................................. 2

1.2AUDIENCE FOR THIS DOCUMENT............................................................................................................. 2

2 PUBLICATION HISTORY......................................................................................................................... 3

3 REFERENCE DOCUMENTS...................................................................................................................12

4 RELEASE RELATED DOCUMENTS ........................................................................................................12

5 PROCESS AND METHODOLOGY..........................................................................................................135.1TOOLS AND RESOURCES ......................................................................................................................13

5.2OPTIMIZATION TOOLS........................................................................................................................13

6 OPTIMIZATION PARAMETERS OVERVIEW ...........................................................................................14

6.1PARAMETERS IMPACTING COVERAGE ......................................................................................................15

6.2PARAMETERS IMPACTING ACCESS........................................................................................................16

6.3PARAMETERS IMPACTING THROUGHPUT..................................................................................................16

6.4PARAMETERS IMPACTING LATENCY........................................................................................................17

6.5PARAMETERS IMPACTING CAPACITY .......................................................................................................176.6PARAMETERS IMPACTING MOBILITY ........................................................................................................17

6.6.1 LTE LTE mobility..............................................................................................................186.6.2 LTE UMTS mobility............................................................................................................196.6.3 LTE GSM mobility..............................................................................................................206.6.4 LTE HRPD mobility ............................................................................................................21

7 NEW FEATURES IN LA4.0...................................................................................................................22

8 COVERAGE OPTIMIZATION HINTS......................................................................................................24

8.1PARAMETERS OPTIMIZATION FOR IMPROVING DOWNLINK COVERAGE.............................................................24

8.1.1 Referencesignalpower........................................................................................................248.1.2 PhichResource .....................................................................................................................25

8.2PARAMETERS OPTIMIZATION FOR IMPROVING UPLINK COVERAGE.................................................................26

8.2.1 sIRTargetforReferencePUCCHFormat.................................................................................268.2.2 sEcorrInit, sEcorrstepforlowerbler & secorrstepforhigherbler..........................................268.2.3 ulSyncSINRsyncToOOSTreshold & UlSyncSINROOStoSyncTreshold.....................................278.2.4 deltaFPUCCHFormat1.........................................................................................................288.2.5 CELL COVERAGE ..................................................................................................................298.2.5.1 UL CELL COVERAGE ........................................................................... 298.2.5.2 DL CELL OUtdoor COVERAGE ................................................................ 298.2.5.3 TOTAL CELL COVERAGE....................................................................... 308.2.5.4 PUSCH FRACTIONAL POWER CONTROL ..................................................... 30

8.2.6 PUSCHPOWERCONTROLALPHAFACTOR...............................................................................318.2.7 qRxLevMin ...........................................................................................................................328.2.8 p0NominalPUSCH................................................................................................................368.2.9 uplinkSIRtargetValueForDynamicPUSCHscheduling............................................................38


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9 ACCESS OPTIMIZATION HINTS ............................................................................................................39

9.1PARAMETERS OPTIMIZATION FOR IMPROVING ATTACH/DETACH PROCEDURES..................................................40

9.1.1 preambleInitialReceivedTargetPower................................................................................409.1.2 PreambleTransmitPowerStepSize .......................................................................................43

9.1.3 Scheduled TRANSMISSION (deltaPreambleMsg3 or tPCRACHMsg3)....................................449.1.4 deltapreamblemsg3............................................................................................................469.1.5 tPCRACHMsg3 ......................................................................................................................46

10 DOWNLINK THROUGHPUT OPTIMIZATION HINTS...........................................................................46

10.1PARAMETERS OPTIMIZATION FOR IMPROVING DOWNLINK THROUGHPUT.......................................................47

10.1.1 dlMCSTransitionTable.......................................................................................................4710.1.2 dlSinrThresholdBetweenCLMimoOneLayerAndTxDiv........................................................5010.1.3 dlSinrThresholdBetweenCLMimoTwoLayersAndOneLayer................................................5110.1.4 dlSinrThresholdBetweenOLMimoAndTxDiv.......................................................................5210.1.5 AlphaFairnessfactor..........................................................................................................5310.1.6 DynamicCFIEnabled..........................................................................................................54

10.1.7 CFI.....................................................................................................................................5510.1.8 cfi1allowed.......................................................................................................................5510.1.9 cfi2allowed.......................................................................................................................5510.1.10 cfi3allowed ......................................................................................................................56

11 UPLINK THROUGHPUT OPTIMIZATION HINTS.................................................................................56

11.1PARAMETERS OPTIMIZATION FOR IMPROVING UPLINK THROUGHPUT...........................................................56

11.1.1 uplinkSIRtargetValueForDynamicPUSCHscheduling..........................................................5611.1.2 pUSCHPowerControlAlphaFactor......................................................................................5811.1.2.1 puschpowercontrolalphafactor combination tests (LAB) ............................... 6011.1.2.2 PUSCHPOWERCONTROLALPHAFACTOR COMBINATION TESTS (LIVE NETwork)....... 67

11.1.3 ulSchedPropFairAlphaFactor.............................................................................................69

12 LATENCY OPTIMIZATION HINTS .......................................................................................................71

12.1PARAMETERS OPTIMIZATION LATENCY.................................................................................................71

12.1.1 Test RECOMMENDATION AND results................................................................................7212.1.1.1 Attach latency ................................................................................. 7212.1.1.2 Attach Latency Results for LA4.0.1 ........................................................ 7312.1.1.3 Last Update Regarding performance (ATTACH & Activation) .......................... 7512.1.1.4 Idle to active latency ......................................................................... 7512.1.1.5 Idle to active latency Results for LA4.0.1 ................................................. 7712.1.1.6 Detach latency ................................................................................. 7812.1.1.7 Ping Latency results for LA4.0.1 ............................................................ 79

13 CAPACITY OPTIMIZATION HINTS ......................................................................................................80

13.1PARAMETERS OPTIMIZATION FOR IMPROVING CAPACITY...........................................................................80

13.1.1 Enb CAPACITY CONFIGURATIONS ......................................................................................8013.1.2 alphaFairnessFactor ..........................................................................................................8113.1.3 UlSchedPropFairAlphaFactor............................................................................................82

14 LTE LTE MOBILITY OPTIMIZATION HINTS......................................................................................83

14.1LTE-LTEMOBILITY .........................................................................................................................84

14.1.1 Check Intra Neighour List at Data base network.............................................................8414.1.2 Inter Frequency Neighbour declaration...........................................................................84

14.1.3 How to avoid ping pong efect in network........................................................................8614.1.4 Mobility parameters ..........................................................................................................8714.1.5 INTRA-FREQUENCY (IDLE MODE) .......................................................................................8814.1.5.1 QRXLEVMIN ..................................................................................... 8914.1.5.2 SINTRASEARCH ................................................................................. 90


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14.1.5.3 QHYST ........................................................................................... 9014.1.5.4 QOFFSETCELL................................................................................... 9114.1.5.5 QRXLEVMINOFFSET ............................................................................ 9214.1.5.6 TRESELECTIONEUTRAN........................................................................ 9214.1.5.7 TRESELECTIONEUTRASFMEDIUM ............................................................. 93

14.1.5.8 TRESELECTIONEUTRASFHIGH ................................................................ 9314.1.5.9 tevaluation ..................................................................................... 9414.1.5.10 NCELLCHANGEHIGH .......................................................................... 9514.1.5.11 NCELLChANGEMEDIUM ....................................................................... 9514.1.5.12 QHYSTSFHiGH ................................................................................. 9614.1.5.13 QHYSTSFMEDIUM .............................................................................. 9614.1.6 INTRA-FREQUENCY (Active MODE) ....................................................................................9714.1.6.1 FILTERCOEFFICIENTRSRP ..................................................................... 9814.1.6.2 HYSTERESIS ..................................................................................... 9914.1.6.3 TIMETOTRIGGER .............................................................................. 10014.1.6.4 CELLINDIVIDUALOFFSET ..................................................................... 10014.1.6.5 EVENTA3OFFSET .............................................................................. 10114.1.6.6 OFFSETFREQ ................................................................................... 102

14.1.6.7 REPORTINTERVAL ............................................................................. 10214.1.6.8 MAXREPORTCELLS ............................................................................ 10314.1.6.9 REPORTAMOUNT .............................................................................. 10314.1.6.10 Call flow for Inter-eNB mobility, X2 HO UE in RRC Connected .................... 10414.1.6.11 Call flow for Inter-eNB mobility, S1 HO UE in RRC Connected .................... 10614.1.6.12 Intra-eNB HO Interruption time results for La4.0.1 ................................... 10714.1.6.13 Reference for all the Software used ..................................................... 10814.1.7 INTER-FREQUENCY (IDLE MODE).....................................................................................10814.1.7.1 QRXLEVMIN .................................................................................... 11014.1.7.2 SNONINTRASEARCH ........................................................................... 11114.1.7.3 THRESHSERVINGLOW ......................................................................... 11214.1.7.4 THRESHXLOW .................................................................................. 11314.1.7.5 tHREShXHIGH .................................................................................. 11414.1.7.6 TRESELECTIONEUTRAN....................................................................... 11414.1.7.7 TRESELECTIONEUTRASFMEDIUM ............................................................ 11514.1.7.8 TRESELECTIONEUTRASFHIGH ............................................................... 11514.1.7.9 NCELLCHANGEHIGH .......................................................................... 11514.1.7.10 NCELLChANGEMEDIUM ...................................................................... 11514.1.7.11 QHYSTSFHiGH ................................................................................ 11514.1.7.12 QHYSTSFMEDIUM ............................................................................. 11514.1.8 INTER-FREQUENCY (ACtive MODE).................................................................................11614.1.8.1 THRESHOLDEUTRARSRP ...................................................................... 11814.1.8.2 THRESHOLD2EUTRARSRP .................................................................... 11814.1.8.3 FILTERCOEFFICIENTRSRP .................................................................... 11914.1.8.4 HYSTERESIS .................................................................................... 119

14.1.8.5 TIMETOTRIGGER .............................................................................. 11914.1.8.6 OFFSETFREQ ................................................................................... 11914.1.8.7 REPORTINTERVAL ............................................................................. 11914.1.8.8 MAXREPORTCELLS ............................................................................ 12014.1.8.9 REPORTAMOUNT .............................................................................. 12014.1.9 Inter-Frequency HO TRIal results (Verizon Winchester Market)....................................12014.1.9.1 Considerations for Band 13 ................................................................. 12014.1.9.2 Considerations for Band 4 ................................................................... 12214.1.9.3 UE used for Multi-Band ...................................................................... 12214.1.9.4 Network Configuration ...................................................................... 12214.1.9.5 Test cases ...................................................................................... 123

15 IRAT MOBLILTY OPTIMIZATION HINTS...........................................................................................128

15.1LTE-UMTSOPTIMIZATION HINTS ....................................................................................................128

15.1.1 Inter-Frequency (IDLE MODE).........................................................................................12915.1.1.1 qRxLevMin ..................................................................................... 13215.1.1.2 sNonIntraSearch .............................................................................. 133


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15.1.1.3 threshServingLow ............................................................................. 13315.1.1.4 threshXLow .................................................................................... 13415.1.1.5 tReselectionUtra .............................................................................. 13515.1.1.6 TRESELECTIONUTRASFMEDIUM ............................................................. 13615.1.1.7 TRESELECTIONUTRASFHIGH ................................................................. 137

15.1.1.8 NCELLCHANGEHIGH .......................................................................... 13715.1.1.9 NCELLCHANGEMEDIUM ....................................................................... 13815.1.1.10 QHYSTSFHiGH ................................................................................ 13915.1.1.11 QHYSTSFMEDIUM ............................................................................. 13915.1.2 Inter-Frequency (ACTIVE MODE)....................................................................................14015.1.2.1 UE measurements needed for LA3.0 PS HO to UTRA-FDD ............................. 14015.1.2.2 LA3.0 PS HO Preparation .................................................................... 14115.1.2.3 LA3.0 PS HO Execution ...................................................................... 14215.1.2.4 THRESHOLDEUTRARSRPB2 ................................................................... 14515.1.2.5 THRESHOLDutrarscp .......................................................................... 14615.1.2.6 OFFSETFREQUTRA ............................................................................ 14615.1.2.7 FILTERCOEFFICIENTOFQUANTITYCONFIGUTRA .......................................... 14715.1.2.8 HYSTERESIS .................................................................................... 148

15.1.2.9 TIMETOTRIGGER .............................................................................. 14915.1.2.10 REPORTINTERVAL ............................................................................ 14915.1.2.11 MAXREPORTCELLS ........................................................................... 15015.1.2.12 REPORTAMOUNT ............................................................................. 15015.1.3 call flow for redirection to UTran..................................................................................15215.1.4 Call flow for PS HO Preparation Phase ...........................................................................15315.1.5 Call flow for PS HO Excution Phase................................................................................153

15.2LTE-GSMMOBILITY OPTIMIZATION HINTS.........................................................................................154

15.2.1 IDLE MODE .......................................................................................................................15415.2.1.1 qRxLevMin ..................................................................................... 15715.2.1.2 SNONINTRASEARCH ........................................................................... 15815.2.1.3 THRESHSERVINGLOW ......................................................................... 158

15.2.1.4 THRESHXLOW .................................................................................. 15915.2.1.5 TRESELECTIONGERAN ........................................................................ 16015.2.1.6 TRESELECTIONGERANSFMEDIUM ............................................................ 16115.2.1.7 TRESELECTIONGERANSFHIGH ............................................................... 16215.2.1.8 NCELLCHANGEHIGH .......................................................................... 16215.2.1.9 NCELLCHANGEMEDIUM ....................................................................... 16315.2.1.10 QHYSTSFHiGH ................................................................................ 16315.2.1.11 QHYSTSFMEDIUM ............................................................................. 16415.2.2 ACTIVE MODE..................................................................................................................16515.2.2.1 THRESHOLDEUTRARSRPB2 ................................................................... 16515.2.2.2 THRESHOLDGERAN............................................................................ 16615.2.2.3 OFFSETFREQGERAN........................................................................... 16715.2.2.4 FILTERCOEFFICIENTOFQUANTITYCONFIGGERAN ........................................ 167

15.2.2.5 HYSTERESIS .................................................................................... 16815.2.2.6 TIMETOTRIGGER .............................................................................. 16915.2.2.7 REPORTINTERVAL ............................................................................. 16915.2.2.8 MAXREPORTCELLS ............................................................................ 17015.2.2.9 REPORTAMOUNT .............................................................................. 17015.2.3 call flow for redirection to Geran..................................................................................17115.2.4 Call flow for Cell Change Order with/without NACC.....................................................172

15.3LTE-HRPDMOBILITY OPTIMIZATION HINTS.......................................................................................172

15.3.1 IDLE MODE .......................................................................................................................17215.3.1.1 SNONINTRASEARCH ........................................................................... 17415.3.1.2 THRESHXLOW .................................................................................. 17415.3.1.3 TRESELECTIONCDMAHRPD ................................................................... 175

15.3.1.4 TRESELECTIONHRPDSFMEDIUM ............................................................. 17615.3.1.5 TRESELECTIONHRPDSFHIGH ................................................................. 17615.3.1.6 NCELLCHANGEHIGH .......................................................................... 17715.3.1.7 NCELLCHANGEMEDIUM ....................................................................... 17715.3.1.8 QHYSTSFHiGH ................................................................................. 178


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15.3.1.9 QHYSTSFMEDIUM .............................................................................. 17915.3.2 ACTIVE MODE..................................................................................................................17915.3.2.1 THRESHOLDEUTRARSRPB2 ................................................................... 18015.3.2.2 THRESHOLDCDMA2000 ....................................................................... 18115.3.2.3 OFFSETFREQ ................................................................................... 181

15.3.2.4 HYSTERESIS .................................................................................... 18215.3.2.5 TIMETOTRIGGER .............................................................................. 18315.3.2.6 REPORTINTERVAL ............................................................................. 18415.3.2.7 MAXREPORTCELLS ............................................................................ 18415.3.2.8 REPORTAMOUNT .............................................................................. 18515.3.3 call flow for redirection to HRPD...................................................................................186

16 ABBREVIATIONS AND DEFINITIONS ................................................................................................186

16.1ABBREVIATIONS............................................................................................................................186


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LIST OF FIGURES

Figure 8.2-1: Throughput for single UE vs. Path loss (Lab environment)....................................................... 30Figure 8.2-2: Throughput vs. RSRP 700 (Field Results VzW)......................................................................... 34Figure 8.2-3: Throughput vs. RSRP AWS (Field Results VzW)........................................................................ 35Figure 8.2-4: qRxLevMin Selection ................................................................................................................... 35Figure 8.2-5: Po_pusch_Nominal Impact......................................................................................................... 38Figure 8.2-6: Slope - PuschPowerControl vs. uplinkSIRtargetValueForDynamicPUSCHscheduling................. 39Figure 9.1-1: preambleTransMax vs. preambleInitialRceivedTargetPower vs.

preambleTransmitPowerStepSize............................................................................................................. 41Figure 9.1-2: Po_preamble impact on UE Tx Power vs. PL(RA) (TRY1).......................................................... 41Figure 9.1-3: Po_preamble impact on UE Tx Power vs. PL (RA)..................................................................... 42Figure 9.1-4: preambleTransMax vs. preambleInitialRceivedTargetPower vs.

preambleTransmitPowerStepSize (example of values)............................................................................ 42Figure 9.1-5: Parameters dependency and relations...................................................................................... 45

Figure 10.1-1: Radio link Quality vs. MCS Robustness vs. Throughput............................................................ 48

Figure 10.1-2: Radio link Quality vs. dlMCSTransition Table vs. Throughput................................................. 48Figure 10.1-3: Dl Sinr Threshold Example........................................................................................................ 51Figure 10.1-4: CL 2Layer-1Layer SNR Switch Threshold: 10 dB (purple) vs. 12 dB (blue) AWGN (Lab

results VzW).............................................................................................................................................. 52Figure 10.1-5: CL 2Layer-1Layer SNR Switch Threshold: 10 dB (purple) vs. 12 dB (blue) EPA 5Hz,

Medium Correlation (Lab Results VzW).................................................................................................... 52Figure 10.1-6: Dl Sinr Threshold Example........................................................................................................ 53Figure 10.1-7: alphaFairnessFactor Change Impact........................................................................................ 54Figure 11.1-1: Impact of the pUSCHPowerControlAlphaFactor =1.0 in MCS usage........................................ 59Figure 11.1-2: Impact of the pUSCHPowerControlAlphaFactor =0.8 in Throughput per RB........................... 59Figure 11.1-3: Impact of the pUSCHPowerControlAlphaFactor =0.7 in Throughput per RB........................... 60Figure 11.1-4: Set 1 Result ............................................................................................................................... 61

Figure 11.1-5: Set 1UL Throughput & UE TX Power vs. Path loss................................................................... 62Figure 11.1-6: SIR Target for theoretical assumptions with different alpha factor values............................ 63Figure 11.1-7: UL SIR Target for theoretical assumptions with different alpha factor values...................... 63Figure 11.1-8: Different alpha factor comparison (Throughput, PRBs, SINR & PUSCH SINR Target)............ 64Figure 11.1-9: UL Throughput & UE TX Power vs. Path loss alpha factor 0.7 & 1 with set 3......................... 65Figure 11.1-10: UL Throughput & UE TX Power vs. Path loss for alpha factor 0.7 for all sets...................... 66Figure 11.1-11: UL Throughput vs. Path loss for set1 & set3 with alpha factor 0.7 and 1 ............................ 67Figure 11.1-12: UE TX Power vs. Path loss for set1 & set3 with alpha factor 0.7 and 1 ................................ 67Figure 11.1-13: Fractional Power Control Slope vs. Sets................................................................................ 68Figure 11.1-14: Impact of the ulSchedPropFairAlphaFactor........................................................................... 70Figure 12.1-1: Example for IMSI attach procedure (with authentication)...................................................... 73Figure 12.1-2: Example for GUTI attach procedure (no authentication)........................................................ 73Figure 12.1-3: Idle to active message chart.................................................................................................... 76

Figure 12.1-4: Example of total Idle to active latency................................................................................... 77Figure 14.1-1: Intra HO Neighbour list............................................................................................................. 84Figure 14.1-2: Coverage analysis AMX trial done by ARFCC team................................................................ 85Figure 14.1-3: X2-Link creation by ANR ........................................................................................................... 86Figure 14.1-4: HO ping pong area.................................................................................................................... 87Figure 14.1-5: LTE to LTE Mobility Measurement phase (RSRP vs. Time).................................................... 88Figure 14.1-6: LTE to LTE Mobility Ranking Phase........................................................................................ 89Figure 14.1-7: LTE to LTE Mobility Decision Phase (RSRP vs. Time)............................................................. 89Figure 14.1-8: LTE to LTE Mobility Handover cases...................................................................................... 97Figure 14.1-9: Theoretical view ....................................................................................................................... 98Figure 14.1-10: filterCoefficientRSRP - Theoretical comparison (Simulation Analysis)................................. 98Figure 14.1-11: Call flow for Inter-eNB mobility, X2 HO UE in RRC Connected (1)................................... 104Figure 14.1-12: Call flow for Inter-eNB mobility, X2 HO UE in RRC Connected (2)................................... 105

Figure 14.1-13: Call flow for Inter-eNB mobility, S1 HO UE in RRC Connected (1).................................... 106Figure 14.1-14: Call flow for Inter-eNB mobility, S1 HO UE in RRC Connected (2).................................... 107Figure 14.1-15: LTE to LTE Mobility Cell Reselection................................................................................. 109Figure 14.1-16: Idle Mode Algorithm B4B13............................................................................................... 109Figure 14.1-17: Idle Mode Algorithm B13B4............................................................................................... 110


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Figure 14.1-18: Events State Machine............................................................................................................ 116Figure 14.1-19: Example of A3 Event based HO for B13 and B4................................................................... 117Figure 14.1-20: Example of A5 Event based HO for B13 and B4................................................................... 117Figure 14.1-21: Network Configuration......................................................................................................... 123Figure 14.1-22: Time spent in each Band vs. Number of Reselection Attempts for 50% OCNS.................... 127

Figure 14.1-23: Time spent in each Band vs. Number of Reselection Attempts for 100% OCNS.................. 127Figure 15.1-1: LTE to UTRAN mobility in the context of IRAT mobility........................................................ 129Figure 15.1-2: Cell Reselection procedure.................................................................................................... 130Figure 15.1-3: UE rules follow-up.................................................................................................................. 130Figure 15.1-4: LTE to UTRAN Mobility (RSRP vs. Time) measurement phase............................................. 131Figure 15.1-5: LTE to UTRAN Mobility Algorithm Cell Reselection toward lower priority UTRAN Cell...... 132Figure 15.1-6: LTE to UTRAN Mobility (RSRP vs. Time) Decision Phase..................................................... 132Figure 15.1-7: UE measurements needed for LA3.0 PS HO to UTRA-FDD..................................................... 140Figure 15.1-8: LA3.0 PS HO Execution........................................................................................................... 142Figure 15.1-9: PS HO to UTRA-FDD - End-to-End call flows.......................................................................... 142Figure 15.1-10: LTE to UTRAN Mobility Redirection Execution.................................................................. 143Figure 15.1-11: RAT frequency with highest cellReselectionPriority is chosen for redirection................... 143Figure 15.1-12: RRC Connection Release with Redirection Info from EUTRAN to UTRAN............................ 144

Figure 15.1-13: Inter RAT threshold for event B2......................................................................................... 145Figure 15.2-1: Reselection from eUTRAN to GERAN ...................................................................................... 154Figure 15.2-2: Inter RAT threshold for event B2........................................................................................... 165Figure 15.2-3: Call Flow for Redirection to Geran........................................................................................ 171Figure 15.2-4: Call Flow for Cell Change Order with /Without NACC........................................................... 172Figure 15.3-1: Inter RAT threshold for event B2........................................................................................... 180Figure 15.3-2: Call Flow for Redirection to HRPD......................................................................................... 186


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LIST OF TABLES

Table 6-1: Parameters impacting UL coverage................................................................................................ 15

Table 6-2: Parameters impacting DL coverage................................................................................................ 16Table 6-3: Parameters impacting attach/detach procedures......................................................................... 16Table 6-4: Parameters impacting DL throughput............................................................................................ 17Table 6-5: Parameters impacting UL throughput............................................................................................ 17Table 6-6: Parameters impacting control plane latency ................................................................................. 17Table 6-7: Parameters impacting eNB Capacity .............................................................................................. 17Table 6-8: Parameters impacting measurements for intra-LTE mobility........................................................ 18Table 6-9: Parameters impacting measurements for inter-frequency (idle mode)........................................ 19Table 6-10: Parameters impacting measurements for inter-frequency (active mode).................................. 19Table 6-11: Parameters impacting LTE UMTS Inter-Frequency (Idle Mode)................................................. 20Table 6-12: Parameters impacting LTE UMTS Inter-Frequency (Active Mode)............................................. 20Table 6-13: Parameters impacting LTE GSM (Idle Mode).............................................................................. 21Table 6-14: Parameters impacting LTE GSM (Active Mode) .......................................................................... 21

Table 6-15: Parameters impacting LTE HRPD (Idle Mode)............................................................................ 21Table 6-16: Parameters impacting LTE HRPD (Active Mode)........................................................................ 22Table 7-1: LA4.0 Features ................................................................................................................................ 23Table 8-1: Default setting for parameter referenceSignalPower.................................................................... 25Table 8-2: UL 2.6GHz....................................................................................................................................... 29Table 8-3: Path Loss & UL Cell Range in Dense Urban Indoor......................................................................... 29Table 8-4: Path Loss & UL Cell Range Suburban in Car................................................................................... 29Table 8-5: DL Cell Range in Dense Urban........................................................................................................ 29Table 10-1: Examples of threshold tuning for a 10MHz band (academic only, not applied in any trial

/project). .................................................................................................................................................. 49Table 10-2: Theory Assumption on CFI Tuning................................................................................................ 55Table 11-1: uplinkSIRtargetValueForDynamicPUSCHscheduling vs. PUSCHPowerControlAlphaFactor........... 57Table 11-2: Different Sets Combinations....................................................................................................... 60

Table 11-3: Different Sets Combinations Used............................................................................................... 68Table 12-1: Attach Latency for LA4.0.1........................................................................................................... 74Table 12-2: SW Reference ................................................................................................................................ 75Table 12-3: Idle to Active Latency ................................................................................................................... 77Table 12-4: SW Reference ................................................................................................................................ 78Table 12-5: Ping Latency for 32 Bytes with and without Extended SR grant for U-plane latency................. 79Table 13-1: LA4.0.1 Capacity figures............................................................................................................... 80Table 14-1: Mobility parameters ...................................................................................................................... 87Table 14-2: Intra-eNB HO Interruption time.................................................................................................. 107Table 14-3: SW Reference .............................................................................................................................. 108Table 14-4: Parameters Tuning for Active Mode........................................................................................... 124Table 14-5: Connected Mode Test cases executed........................................................................................ 124Table 14-6: A5 through S1 with 50% DL OCNS................................................................................................ 124Table 14-7: A5 through X2 with 100% DL OCNS............................................................................................. 124Table 14-8: A5 through X2 with 50% DL OCNS............................................................................................... 124Table 14-9: A3 through X2 with 50% DL OCNS............................................................................................... 124Table 14-10: A3 through X2 with 100% DL OCNS........................................................................................... 125Table 14-11: A5 through X2 with 100% DL OCNS (thresholdEutraRSRP & threshold2EutraRSRP =-111)....... 125Table 14-12: A5 through X2 with 50% DL OCNS (thresholdEutraRSRP & threshold2EutraRSRP =-111)......... 125Table 14-13: Parameters Tuning for Idle Mode............................................................................................. 126Table 14-14: Idle Mode Test cases executed ................................................................................................. 126Table 14-15: Idle Mode Test B4B13 with 50% OCNS................................................................................... 126Table 14-16: Idle Mode Test B13B4 with 50% OCNS................................................................................... 126Table 14-17: Idle Mode Test B4B13 with 100% OCNS................................................................................. 127Table 14-18: Idle Mode Test B13B4 with 100% OCNS................................................................................. 127


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3REFERENCE DOCUMENTS

Ref. Document Number Title

[1] LTE/IRC/APP/027426 LPUG LA4.0

[2] LTE/IRC/APP/032105 LA3.0.2 Optimization Handbook

4RELEASE RELATED DOCUMENTS

Ref. Document Number Title

[1] LTE/IRC/APP/032318 LA4.0.1 Service Performance Handbook

[2] LTE/IRC/APP/031966 LA4.0.1 Migration - QoS and Stability Monitoring Handbook[3] LTE/IRC/APP/031688 LA4.0.1 Engineering Toll Recommendation and Strategy[4] LTE/IRC/DJD/033695 LA4.0.1 LTE Tests Plan - TIS Engineering Contribution[5] LTE/IRC/APP/032278 LA4.0.1 LTE Optimisation Troubleshooting Handbook[6] LTE/IRC/APP/034221 LA4.0.1 LIMO Executive Report User Guide[7] LTE/IRC/APP/031953 LA4.0.1 QoS & Stability Monitoring Handbook
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5PROCESS AND METHODOLOGY

5.1TOOLS AND RESOURCES

Tools used for the Network Optimization are described in the Alcatel-Lucent LTE/E-UTRANTechnology Trial Test Tools document.

5.2OPTIMIZATION TOOLS

A set of tools are needed to carry out the optimization objectives:

Simulation Tool for RF design: Alcatel-Lucent uses A9955. Used for antenna change validation andRF analysis. There must be consistency with the methods used by the customer so it is possible touse their solution if it has been validated by Alcatel-Lucent teams.

Data Acquisition Platform (DAP): currently Nixt Platform composed of JSDU Nixt E6474A, W1314Areceiver and 1 to 4 test mobiles.

Tests Mobiles: typically LGE, Motorola, Samsung and Bandrich. Also IPW or Sequans UEs for TDDsystems.

Post processing platform (PPP): Gladiator or eDAT (ALU internal), which allow automatic andcustomized KPI generation, built-in failure characterization, as well as UE and Call Tracesynchronization capabilities (for a deeper and accurate analysis).

For enhanced troubleshooting, the usage of a protocol analyzer (Agilent DNA) may be required, inparticular to monitor the S1 and X2 interfaces.

Project Database: For a correct follow-up of all the optimization activities it is mandatory to have acommon and unique project information system (Project Database) which contains the followinginformation:

Site configuration (geographical coordinates, antenna height/azimuth/tilt)Site issuesUpdated operations planImplemented/Planned ChangesMetrics: performance KPI, outage times, workload, delays, escalated issues etc.Work Orders and implementation delays

Reporting templatesEquipment trackingList of raised ARs


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6OPTIMIZATION PARAMETERS OVERVIEW

This chapter is intended to present various parameters existing in ALU RAN, grouped per main areaof interest in trials and network deployments. Grouping was made such that it reflects various typesof tests that are being performed during trials and KPIs tests that might as well be addressed duringtrials and network deployment.Parameters have been split by following domains:

CoverageAttach /DetachThroughputLatencyCapacityMobility

Due to the wide scope of mobility, the parameters impacting mobility have been further divided in:

LTE LTE mobilityLTE UMTS mobilityLTE - GSM mobilityLTE HRPD mobility

Inside each group, parameters are ordered by the most important and relevant for optimizationactivities. They should be optimized in case of strong constraints for performance (very demandingKPI, strong competition).To each parameter is associated a recommended value that can be obtained from [1] forparameters that have not been yet optimized in field activities. The parameters for which adifferent, optimized, value have been obtained in various field tests, have recommended valuesspecified in the corresponding paragraphs along with some precisions about the conditions in whichthe optimized value have been obtained (cluster, load).


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6.1PARAMETERS IMPACTING COVERAGE

The parameters of LA4.0.0 release having an impact on coverage are presented in the table below.Most often the coverage is determined by UL link thus for optimizing coverage it is needed to

optimize levels of UL power.Below one can find the parameters commented and reviewed for DL & UL Coverage.

Object Name Recommended Value

ULPowerControlConf pUSCHPowerControlAlphaFactor 0.8

ULPowerControlConf p0NominalPUSCH Check Recommendation

EnbRadioConfuplinkSIRtargetValueForDynamicPUSCHsche

dulingCheck Recommendation

EnbRadioConf sEcorrInitCheck Recommendation

EnbRadioConf sEcorrstepforlowerbler Check Recommendation

EnbRadioConf secorrstepforhigherbler Check Recommendation

EnbRadioConf ulSyncSINRsyncToOOSTreshold Check Recommendation

EnbRadioConf ulSyncSINROOStoSyncTreshold Check Recommendation

CellSelectionReselectionConf qRxLevMin Check Recommendation

ULPowerControlConf deltaFPUCCHFormat1 deltaF0

ULPowerControlConf sIRTargetforReferencePUCCHFormat Check Recommendation

Table 6-1: Parameters impacting UL coverage


CellSelectionReselectionConf qRxLevMin Check Recommendation

PowerOffsetConfiguration referenceSignalPower Check Recommendation

PowerOffsetConfiguration primarySyncSignalPowerOffset Check Recommendation

PowerOffsetConfiguration secondarySyncSignalPowerOffset Check Recommendation

PowerOffsetConfiguration pBCHPowerOffset Check Recommendation

PowerOffsetConfiguration pDCCHPowerOffsetSymbol Check Recommendation

PowerOffsetConfiguration pCFICHPowerOffset Check Recommendation

PowerOffsetConfiguration pHICHPowerOffset Check Recommendation

PowerOffsetConfiguration pbOffsetPdsch Check Recommendation


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PowerOffsetConfiguration paOffsetPdsch Check Recommendation

LteCell cellDLTotalPower Check Recommendation

PowerOffsetConfiguration phichResource 1

Table 6-2: Parameters impacting DL coverage

6.2PARAMETERS IMPACTING ACCESS

Network performance can be evaluated by some measures implying attach and detach procedures(e.g. attach time, detach time, attach success rate). The parameters impacting attach, detachprocedures are listed in the table below.


CellRachConf preambleInitialReceivedTargetPower dBm-104

CellRachConf preambleTransmitPowerStepSize dB6

ULPowerControlConf deltaPreambleMsg3 0

CellRachConf tPCRACHMsg3 4dB

Table 6-3: Parameters impacting attach/detach procedures

6.3PARAMETERS IMPACTING THROUGHPUT

The parameters that can impact the throughput, both on UL and on DL, are listed in the tablebelow. On DL the throughput is most influenced by the type of antenna system that is beingused/selected wile on UL by the required quality of the received signal, which forces higher powersof PUSCH channel.

Object NameRecommended

Value

enbRadioConf dlMCSTransitionTable Check table

DownlinkMimo dlSinrThresholdBetweenCLMimoOneLayerAndTxDiv -10

DownlinkMimo dlSinrThresholdBetweenCLMimoTwoLayersAndOneLayer 12

CellL2DLConf dlSinrThresholdBetweenOLMimoAndTxDiv 15

CellL1L2ControlChannelsConf AlphaFairnessfactor 1

CellL1L2ControlChannelsConf DynamicCFIEnabled True

CellL1L2ControlChannelsConf CFICheck

recommendation

CellL1L2ControlChannelsConf cfi1allowedCheck

recommendation

CellL1L2ControlChannelsConf cfi2allowed True


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CellL1L2ControlChannelsConf cfi3allowed True

Table 6-4: Parameters impacting DL throughput

Object Name RecommendedValue

enbRadioConfuplinkSIRtargetValueForDynamicPUSCHscheduling

Check table

ULPowerControlConf pUSCHPowerControlAlphaFactor 0.8

DownlinkMimo ulSchedPropFairAlphaFactor 0.5

Table 6-5: Parameters impacting UL throughput

6.4PARAMETERS IMPACTING LATENCYLatency is generally considered either as control plane latency or as user plane latency. Controlplane latency involves the network attachment operation while user plane latency only considersthe latency of packets while UE is in connected state.Parameters impacting control plane latency (attachment operation) and user plane latency aregiven in the tables below.Most of parameters impacting attachment operations are higher limits of various processes takingplace during attachment procedure. The impact of such limits on the value of control plane latencyis not significant.


CellRachConf preambleInitialReceivedTargetPower dBm-104

CellRachConf preambleTransMax n3

CellRachConf preambleTransmitPowerStepSize dB6

EnbRadioConf aUGtriggerDelayforRACHmsg4 10

Table 6-6: Parameters impacting control plane latency

6.5PARAMETERS IMPACTING CAPACITY

The parameters impacting capacity are listed in the table below.


CellRachConf alphaFairnessFactor 1

CellRachConf ulSchedPropFairAlphaFactor 0.5

Table 6-7: Parameters impacting eNB Capacity

6.6PARAMETERS IMPACTING MOBILITY

Mobility in LTE includes mobility during idle states and during active states. Mobility can involveseveral technologies and several frequencies.


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Note:Measurement Gap feature parameters can impact the mobility parameters considered throughthe quality of measurement performed.

6.6.1LTE LTE MOBILITY

Because measurements are somehow a common part of various types of mobility, in the table beloware listed the parameters impacting measurement process for intra-LTE mobility.


CellSelectionReselectionConf qRxLevMin -120

CellSelectionReselectionConf sIntraSearch 62

CellSelectionReselectionConf qRxlevminoffset 8

CellSelectionReselectionConf qHyst dB2

CellReselectionConfLte tReselectionEUTRAN 2

LteNeighboringCellRelation qoffsetCell dB0

RrcMeasurementConf filterCoefficientRSRP Fc8

LteSpeedDependentConf tReselectionEutraSfMedium oDot25

LteSpeedDependentConf tReselectionEutraSfHigh oDot25

SpeedStateEvalConf tEvaluation S30

SpeedStateEvalConf nCellChangeHigh 12

SpeedStateEvalConf nCellChangeMedium 4

SpeedStateEvalConf qHystSfHigh dB-6

SpeedStateEvalConf qHystSfMedium dB-6

ReportConfigEUTRA Hysteresis 2

ReportConfigEUTRA timeToTrigger ms40

LteNeighboringCellRelation cellIndividualOffset dB0

ReportConfigEUTRA eventA3Offset 0

LteNeighboringFreqConf offSetFreq dB0

ReportConfigEUTRA reportInterval ms240

ReportConfigEUTRA maxReportCells Check Recommendation

ReportConfigEUTRA reportAmount r8

Table 6-8: Parameters impacting measurements for intra-LTE mobility


CellSelectionReselectionConf qRxLevMin -120

CellSelectionReselectionConf sNonIntraSearch 16

CellSelectionReselectionConf threshServingLow 10

LteNeighboringCellRelation threshXLow 0

CellSelectionReselectionConf qHyst dB2

CellReselectionConfLte tReselectionEUTRAN 2


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LteSpeedDependentConf tReselectionEutraSfMedium oDot25

LteSpeedDependentConf tReselectionEutraSfHigh oDot25





Table 6-9: Parameters impacting measurements for inter-frequency (idle mode)


ReportConfigEUTRA thresholdEutraRsrp -120

ReportConfigEUTRA Threshold2EutraRsrp -100

ReportConfigEUTRA Hysteresis 2

ReportConfigEUTRA timeToTrigger ms40

RrcMeasurementConf filterCoefficientRSRP Fc8

LteNeighboringFreqConf offSetFreq dB0

ReportConfigEUTRA reportInterval ms240

ReportConfigEUTRA maxReportCells Check Recommendation

ReportConfigEUTRA reportAmount r8

Table 6-10: Parameters impacting measurements for inter-frequency (active mode)

6.6.2LTE UMTS MOBILITY

Coexistence of various technologies requires the possibility of performing mobility between varioustypes of RAN. Indeed, such mobility requires multi-standard UEs.

Parameters impacting LTE UMTS mobility are presented in the table below.


CellReselectionConfUtraFdd qRxLevMin -115



CellReselectionConfUtraFdd threshXLow 0

UtraNeighboring tReselectionUtra 2

UtraSpeedDependentConf tReselectionUtraSfMedium oDot25

UtraSpeedDependentConf tReselectionUtraSfHigh oDot25




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Table 6-11: Parameters impacting LTE UMTS Inter-Frequency (Idle Mode)


ReportConfigUTRA thresholdEutraRsrpB2 -100

qReportConfigUTRA thresholdUtraRscp -114

RrcMeasurementConf filterCoefficientOfQuantityConfigUtra fc4

ReportConfigUTRA hysteresis 4

ReportConfigUTRA timeToTrigger ms100

ReportConfigUTRA reportInterval ms240

ReportConfigUTRA maxReportCells 1

ReportConfigUTRA reportAmount r8

MeasObjectUTRA offsetFreqUTRA 0

Table 6-12: Parameters impacting LTE UMTS Inter-Frequency (Active Mode)

6.6.3LTE GSM MOBILITY

Parameters impacting LTE GSM mobility are presented in the table below.


CellReselectionConfGERAN qRxLevMin -101



CellReselectionConfGERAN threshXLow 0

GeranNeighboring tReselectionGERAN 2

GeranSpeedDependentConf tReselectionGERANSfMedium oDot25

GeranSpeedDependentConf tReselectionGERANSfHigh oDot25






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Table 6-13: Parameters impacting LTE GSM (Idle Mode)


ReportConfigGERAN thresholdEutraRsrpB2 -100

ReportConfigGERAN thresholdGeran -110

RrcMeasurementConf filterCoefficientOfQuantityConfigGERAN fc2

ReportConfigGERAN hysteresis 3

ReportConfigGERAN timeToTrigger ms100

ReportConfigGERAN reportInterval ms240

ReportConfigGERAN maxReportCells 1

ReportConfigGERAN reportAmount r8

MeasObjectGERAN offsetFreqGERAN 0

Table 6-14: Parameters impacting LTE GSM (Active Mode)

6.6.4LTE HRPD MOBILITY

Mobility implying CDMA ecosystem can be realized in idle mode as cell reselection and in connectedmode as cell redirection. Both features are used when LTE coverage ends and there is a larger CDMAcoverage. Parameters impacting LTE CDMA mobility are presented in the table below.



CellReselectionConfHrpd threshXLow -2

HrpdNeighboring tReselectionCDMAHRPD 2

HrpdSpeedDependentConf tReselectionHRPDSfMedium oDot25

GeranSpeedDependentConf tReselectionHRPDSfHigh oDot25





Table 6-15: Parameters impacting LTE HRPD (Idle Mode)



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ReportConfigCDMA2000 thresholdEutraRsrpB2 -113

ReportConfigCDMA2000 thresholdCDMA2000 -9

MeasObjectCDMA2000 OffSetFreq 1

ReportConfigCDMA2000 hysteresis 3

ReportConfigCDMA2000 timeToTrigger ms100

ReportConfigCDMA2000 reportInterval ms240

ReportConfigCDMA2000 maxReportCells 2

ReportConfigCDMA2000 reportAmount r8

Table 6-16: Parameters impacting LTE HRPD (Active Mode)

7NEW FEATURES IN LA4.0

In the table below is presented all the new features belonging to LA4.0 and it is identified all thedomains impacted by each feature.

For more information regarding the features the following link should be checked: LA4.x FTSDocuments for Review

Feature name Optimization Capacity Throughput Coverage Latency Mobility Attach MOS

LA4.0 KPI Targets KPI x x x x x x x

LA4.0 eNB SW Capacity Targets KPI x x x x

Commercial Mobile AlertSystem (CMAS) support

E2E

Support Fiber delay (or anydelay between modem and RF

head) in LTEKPI

Single antenna transmit scheme Optim x x x x x

VoLTE Solution for Field TrialApplications

E2E

VoLTE Friendly User Trialsolution

E2E

RoHC v1 Support for VoIP E2E

ECID and LPP protocol support(trial)

E2E

eNB Synchronization supportfor OTDOA (Trial)

E2E

eNB IMS VoIP emergency callsupport (trial)

E2E

eNB support of OTDOAHearability Enhancement (Trial

)E2E

CSFB enhancement toUTRAN/GERAN-- enhanced

Redirection and PSHOKPI x x

ANR Support for Inter RATNeighbours (UTRAN)

Optim x

LTE RRH Antenna Cross ConnectCapability Support in LA4.0.1

KPI

Transport UL Traffic Shaping E2E/Optim x

Congestion Management at CallAdmission

E2E

Service, and load basedhandover behaviour support

KPI x x
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(eMCTA -Phase 2)

LTE and 1xRTT cell reselection Optim x

CS Fallback to 1XRTT for VoiceCalls-- Dual

transceiver/receiver UE

Standard based solution

E2E/Optim x x

Transport eUTRAN Sharing E2E

eUTRAN Sharing basics: MOCNwith shared LTE spectrum

KPI

eUTRAN Sharing - Mobility KPI

Tuneable Antenna Path Delaybetween RF head and DAS

KPI

LTE Support for 5MHz 4RxReceive Diversity

KPI x x x

Inter LTE Service ProviderRoaming (using Home PGW)

E2E

CSFB to UTRAN/GERANenhancements with enhanced

RedirectionE2E

GSMA VoLTE IMS ProfileCompliance Phase1 E2E

LTE Local Breakout with S9 E2E

Online Charging between ALUPGW and 8610 ICC over Ro/Gy

E2E

LTE Offline Charging Supportwith ALU PGW/SGW and IeCCF

on Ga InterfaceE2E

Public Safety E2E SolutionTesting for LE4.0

E2E

Basic EUTRAN Sharing withMOCN

E2E

Priority Access With Pre-Emption (for all bearers)

E2E

Table 7-1: LA4.0 Features


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8COVERAGE OPTIMIZATION HINTS

In this chapter it will be highlighted the main focus of testing and the primary steps that will allow

to optimize a specific domain and the most important /priority parameters; in this case the domainaddressed is coverage in LTE.In this chapter it will be beaked in two sub-domains; Downlink Coverage and Uplink Coverage.Normally some questions arise, such as:

When to perform coverage optimization?Which parameters can help extending /reducing the coverage?

Mainly the Coverage optimization can occur when the Link Budget is below expectations(Theoretical calculation).

Before starting playing with the parameterization; usually is part of best practice rules for in NearCell /Mid Cell & Cell Edge test to follow up simple steps as:

Check the CQIEvaluate RSSI vs. SNR relationEvaluate RSRP vs. RSRQThroughput Values for specific location

If we could guarantee that these values are normal, the chances to have performance issues aremuch less difficult to occur.

If regardless of the correct values, still facing some performance issues, the below parameters canbe used in order to correct the situation.

When changing parameters; you can adopt a more error-free approach, meaning that a parameter is

changed at each time. If three or four parameters are changed same time it could be difficult tounderstand which one is bringing the improvement in performance.

As note; please remember that this can be a static test in each position, or can be a moving testthe same principles can be applied in both situations.

8.1PARAMETERS OPTIMIZATION FOR IMPROVING DOWNLINKCOVERAGE

8.1.1REFERENCESIGNALPOWER

The Reference Signal Poweris a key RF parameter that impacts coverage.

Parameter referenceSignalPower configures the DL RS absolute power applied per ResourceElement (REG) and per transmit antenna. This level is used as a power level reference (the powerlevels for all the other DL signals and channels are set relative to it).

ATTENTION! When modifying this parameter, all other signal power setting will be automaticallyadjusted in accordance to a power offset relative to the referenceSignalPower.

This parameter is expressed in dBm. It is converted into linear scale (miliwatts) according to the

following formula:

P [mW] = 100.1referenceSignalPower


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Expected behaviour when changing this parameter:The higher the setting, the larger the cell coverage on the downlink, but leaves smaller powerheadroom available for other downlink signals and channels.The lower the value, the smaller the cell coverage on the downlink axis, but larger power headroomis available for other downlink signals and channels.

Note: The following table translates the expected behaviour in terms of cellDLTotalPower whenchanging the reference Signal Power; some difference may occur if other sets of parameters areused also.

transmissionMode cellDLTotalPower dlBandwidth referenceSignalPower

tm1

43,0

n15-3MHz 22

n25-5MHz 20

n50-10MHz 17

n100-20MHz 14

44,7

n15-3MHz 24

n25-5MHz 22

n50-10MHz 19

n100-20MHz 16

46,0

n15-3MHz 22

n25-5MHz 23

n50-10MHz 20

n100-20MHz 17

47,7

n15-3MHz 27

n25-5MHz 25

n50-10MHz 22

n100-20MHz 19

tm2, tm3, tm4

43,0

n15-3MHz 23

n25-5MHz 21n50-10MHz 18

n100-20MHz 15

44,7

n15-3MHz 24

n25-5MHz 22

n50-10MHz 19

n100-20MHz 16

46,0

n15-3MHz 26

n25-5MHz 24

n50-10MHz 21

n100-20MHz 18

47,7

n15-3MHz 28

n25-5MHz 25

n50-10MHz 22

n100-20MHz 19

Table 8-1: Default setting for parameter referenceSignalPower

8.1.2PHICHRESOURCE

PHICH channels are grouped in PHICH groups. Each PHICH group consists of 8PHICH channels (hence conveys 8 ACK/NACKs) that use the same resources,PHICH channels of a same group being separated by orthogonal sequences.

In FDD, the number of PHICH groups in a subframe is:

Where:

Recommended Value = Check Table 8-1

NGroup PHICH= [Ng (NDL

RB/8]


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Ng{1/6, 1/2,1, 2} and is configured by parameterphichResourceNDLRBis the total number of RBs in the downlink and is configured by parameter dlBandwidth

A PHICH group consists of 3 REGs over either 1 or 3 OFDM symbols, depending on the value ofparameter phich-Duration (normal or extended). This parameter canonly be set to extendedif the CFI is equal to 3.

Expected behaviour when changing this parameter:

Setting the value low will result in lower number of PHICH groups in a subframe, so the higher thenumber of ACK/NACKs that need to be sent out the longer the buffer, eventually leading to failingto transmit the messages.Setting value high will impact in having a higher number of PHICH groups in a subframe, so thefewer ACK/NACKs needed to be transmitted, OFDM symbols are not used and the allocated

resources for this process go to waste.

8.2PARAMETERS OPTIMIZATION FOR IMPROVING UPLINK COVERAGE

8.2.1SIRTARGETFORREFERENCEPUCCHFORMAT

The PUCCH power control procedure is used to guarantee the required error rate. For this purpose,it aims at achieving a target SIR the value of which guarantees the required error rate. The SIRtarget is set to sIRTargetforReferencePUCCHFormat for PUCCH Format 1A and tosIRTargetforReferencePUCCHFormat + deltaFPUCCHFormat1b for PUCCH format 1B.

Note that the PUCCH power control procedure assumes shortened PUCCH Format to account for theSRS configuration.

This parameter is a key RF optimization parameter. Higher settings of this parameter will improvePUCCH reception, but will also drive higher UE TX power leading to interference to neighbouringcells, and vice-versa.

Note:Recent results coming from VzW FSA, are pointing for a different value main justificationis that in order to support dynamic change of the number of receiving antennas (and 4xreceive), in LA4 to have the same effect /influence they need to be adjusted.

8.2.2SECORRINIT, SECORRSTEPFORLOWERBLER &SECORRSTEPFORHIGHERBLER

The eNB starts Spectrum Efficiency Correction when the call setup is completed using these two

parameters and sEcorrMin, sEcorrMax.

sEcorrInit is the initial correction factor value applied at call setup.

Recommended Value & Only Supported Value= "1"

Recommended Value= "-3.0"

VzW FSA LA4 Value= "0.0"


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This parameter controls the initial value (in dB) of correction metric SEcorr managed by the linkadaptation function to maintain the PUSCH initial HARQ BLER around its target value.

The lower the sEcorrInit value, the more conservative is the PUSCH link adaptation starting pointand, consequently, the lower the PUSCH MCS. In other words, the lower the sEcorrInit values, thelower is the initial PUSCH MCS value, and the lower are the risks of observing high BLER value at callsetup or on the target cell just after handover.

Note however that the lower the sEcorrInit value, the longer the link adaptation will take toconverge to its setpoint. This may impact the maximum achievable throughput for a brief period(exact time depends on traffic activity) after call setup or handover.

Note:Recent results coming from VzW FSA, are pointing for a different value main justificationis that in order to support dynamic change of the number of receiving antennas (and 4x

receive), in LA4 to have the same effect /influence they need to be adjusted.

sEcorrStepForLowerBLER and sEcorrStepForHigherBLER parameters are key RF optimizationparameters. Higher step sizes will allow the eNodeB to make quicker compensation to any sourcesof SINR-to-MCS conversion error, but could lead to wider swings in data rates and HARQperformance. Lower settings will slow down the spectrum efficiency correction process, impactingHARQ performance.

The tuning of the table of SE_corr values (i.e. sEcorrStepForLowerBLER and

sEcorrStepForLowerBLER) is performed so that if N =floor(x), then the ratio of the SE_corr valuesaround the target HARQ Tx rate satisfies the following condition:

The other values in the SE_corr tables are set in order to allow fast convergence around that setpoint.

&

8.2.3ULSYNCSINRSYNCTOOOSTRESHOLD & ULSYNCSINROOSTOSYNCTRESHOLD

Recommended & Default Value= "-7" for sEcorrInit

VzW FSA LA4 Value= "-10"

Recommended & Default Value = [-0.12500000, 0.03125000, -0.04687500, -

0.12500000, -0.25000000, -0.50000000, -0.50000000, -0.50000000, -0.50000000

] for SECORRSTEPFORLOWERBLER

Recommended & Default Value = "[-0.12500000, 0.03125000, -0.04687500, -

0.12500000, -0.25000000, -0.50000000, -0.50000000, -0.50000000, -0.20000000

]" for SECORRSTEPFORHIGHERBLER


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The uplink synchronization detection mechanism is based on the SIR metric derived from theSounding Reference Signal observations. Upon processing of an SRS measurement report from L1related to user k, the UL scheduler evaluates the UL synchronization status of that user bycomparing the SRS synchronization metric computed to threshold levels as follows:

The threshold for the transition from In sync state to out of sync state is configured byparameter ulSyncSINRsyncToOOSTreshold,i.e.If the UE is assumed in In Sync state and the following condition is met:SINRsync(userk) ulSyncSINROOStoSyncThresholdThen the user is considered in In Sync state by the MAC scheduler.

Note that the tuning must satisfy the following condition:ulSyncSINRsyncToOOSTreshold < ulSyncSINROOStoSyncTreshold

Concerning the deltaFPUCCHFormat1; the setting of the UE Transmit Power PPUCCH for PUCCH in

subframe i is defined by PPUCCH (i) = min{Pmax, P0 _ PUCCH + PL + F_ PUCCH +g(i)} [dBm]Where F _ PUCCH denotes the (PUCCH) format specific power offset; the format dependent poweroffset TF_PUCCH (TF) is defined on a per cell basis and configured by parameterdeltaFPUCCHFormat1 for format 1.

Note:Recent results coming from VzW FSA, are pointing for a different value main justification isthat in order to support dynamic change of the number of receiving antennas (and 4x receive),in LA4 to have the same effect /influence they need to be adjusted.

8.2.4DELTAFPUCCHFORMAT1

This parameter is used for setting the transmit power of SR over PUCCH by the UE. LA3.0 eNodeBrelies on Scheduling Request on PUCCH from UE for scheduling uplink grants. If the SR is notreceived by the eNodeB, it will trigger the UE to declare SRmax failure, which in turn will triggereNodeBs OOS condition.Under certain conditions the SR power may not be sufficient to ensuredetection. By boosting the SR transmit power, it increases the SR detection likelihood at theeNodeB.

Concerning the deltaFPUCCHFormat1; the setting of the UE Transmit Power PPUCCH for PUCCH in

subframe i is defined by PPUCCH (i) = min{Pmax, P0 _ PUCCH + PL + F_ PUCCH +g(i)} [dBm]Where F _ PUCCH denotes the (PUCCH) format specific power offset; the format dependent poweroffset TF_PUCCH (TF) is defined on a per cell basis and configured by parameterdeltaFPUCCHFormat1 for format 1.

Recommended Values = -17 for ulSyncSINRsyncToOOSThreshold & -16 for

ulSyncSINROOStoSyncThreshold

VzW FSA LA4 Value= -14 for ulSyncSINRsyncToOOSThreshold & -13 for

ulSyncSINROOStoSyncThreshold


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8.2.5CELL COVERAGE

Examples on following settings:

Central Frequency: 2.6 GHzRF channel models: Dense urban, suburban in-car

8.2.5.1 UL CELL COVERAGE

The Uplink cell coverage is defined as a target service that UE must satisfy at cell edge conditions.The worst case is 14.5 kbps which was