LTE Basic Optimisation
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- Eustace Bennett
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1 LTE Basic Optimisation 1 Nokia Siemens Networks 2013
2 Summary of LTE Optimization Team Tasks I. LTE Site Information II. LTE Site Health & Stability Check After Integration III. LTE Neighbour Definition & Creation IV. LTE Parameter Consistency Check IV. LTE Drive Test & Analysis IV. LTE KPI & Performance Analysis 2 Nokia Siemens Networks 2013
3 LTE Site Information - Physical Layer Cell ID (PCI) - RACH Root Sequence Index - Tracking Area Code (TAC) 3 Nokia Siemens Networks 2013
4 Physical Layer Cell ID (PCI) What is the PCI? Physical Layer Cell Identity (PCI) identifies a cell within a network. There are 504 Physical Layer Cell Identities. So, PCI is not unique! PCI is defined by the parameter phycellid : Parameter Object Range Default phycellid LNCEL 0 to Nokia Siemens Networks 2013
5 PCI Planning Principle UE should never receive simultaneously the same PCI from more than one cell. Neighbour cells should not have the same PCI (collision free). Neighbour of neighbour cells should not have the same PCI (confusion free). In priority order, below are the recommendations when planning the PCI. No.1 is the most important. All four should be fulfilled, ideally. Id = 5 Id = 2 Id = 3 Id = 4 Id = 0 Id = 1 Id = 11 Id = 8 Id = 9 Id = 10 Example 1 PCI Identity Plan Id = 6 Id = 7 1. Avoid assigning the same PCI to neighbour cells. 2. Avoid assigning the same mod3(pci) to neighbour cells. 3. Avoid assigning the same mod6(pci) to neighbour cells. 4. Avoid assigning the same mod30(pci) to neighbour cells. Example 2 PCI Identity Plan 5 Nokia Siemens Networks 2013
6 PRACH Planning Principle PRACH configuration of two cells must be different within the PRACH re-use distance to increase the RACH decoding success rate. PRACH transmission can be separated by: Time (prachconfindex) Frequency (prachfreqoff) Sequence (prachcs and RootSeqIndex) Parameter Object Range Default prachconfindex LNCEL , step 1 3 prachfreqoff LNCEL 0 94, step 1 - prachcs LNCEL 0 15, step 1 12 RootSeqIndex LNCEL 0 837, step 1-6 Nokia Siemens Networks 2013
7 PRACH Planning Planning Steps 1. Define the PRACH Configuration Index (prachconfindex) Depends on preamble format which depends on the cell range. PrachConfIdenx should be the same for each cell of a site. 2. Define the PRACH Frequencey Offset (prachfreqoff) Depends on the PUCCH region. For simplicity, prachfreqoff can be assumed to be the same for all cells of a network. 3. Define the PRACH Cyclic Shift (prachcs) Depends on the cell range. If, for simplicity, same cell range is assumed for all network, then prachcs is the same for all cells. 4. Define the RACH Root Sequence (rootseqindex) It points to the first root sequence. It needs to be different for neighbour cells. RootSeqIndex separation between cells depends on how many are necessary per cell (i.e. depends on PrachCS) 7 Nokia Siemens Networks 2013
![roundup [PUCCH resources/2] If PRACH area is placed at the upper border of UL frequency band, then :](/docs-images/79/79275045/images/8-2.jpg "prachfreqoff = NRB 6 roundup [PUCCH resources/2] prachconfindex = 3 prachfreqoff = 4 prachcs = 12 8 Nokia")
8 PRACH Planning PRACH Configuration Index, PRACH Frequency Offset, PRACH Cyclic Shift Cell Range PUCCH Region RACH Density = 1 If PRACH area is placed at the lower border of UL frequency band, then : prachfreqoff = roundup [PUCCH resources/2] If PRACH area is placed at the upper border of UL frequency band, then : prachfreqoff = NRB 6 roundup [PUCCH resources/2] prachconfindex = 3 prachfreqoff = 4 prachcs = 12 8 Nokia Siemens Networks 2013
9 PRACH Planning RACH Root Sequence PRACH Cyclic Shift defines the number of cyclic shift (in terms of number of samples) used to generate multiple preamble sequences from a single root sequence. prachcs = 12 number of cyclic = 119 Root sequence length is 839. So a cyclic shift of 119 means : roundown [839/119] = 7 signatures per root sequence 64 preambles are transmitted in the PRACH frame. If one root sequence is not enough to generate 64 preambles, then more root sequences are required. So : Roundup [64 preambles / 7] = 10 root sequences per cell Root Sequence Index points to the first root sequence to be used when generating the set of 64 preamble sequences. rootseqindex = 0, 10, 20, 30,,820, 830 Recommendation : Use different Root Sequence Index across neighbouring cells to ensure neighbour cells will use different preamble sequences 9 Nokia Siemens Networks 2013
10 Tracking Area Code (TAC) Tracking Area Code (TAC) for LTE sites has been planned and allocated by Access Network Design Team as below. Region TAC Auckland CBD Auckland South and Airport Auckland South West Auckland North Auckland West Auckland South Greater Auckland 41744, Nokia Siemens Networks 2013
11 LTE Site Health & Stability Check After Integration - BTS Status Check - Alarms Check 11 Nokia Siemens Networks 2013
12 BTS Status & Alarms Check Using Top Level User Interface After the site is integrated, BTS Status and Alarms can be checked from NetAct using Top Level User Interface. Opening a View & Search/Select STATUS ALARM MONITOR 12 Nokia Siemens Networks 2013
13 BTS Status & Alarms Check Using BTS Site Browser STATUS BTS Status and Alarms can also be checked from NetAct using BTS Site Browser. 13 Nokia Siemens Networks 2013 ALARM MONITOR
14 BTS Status & Alarms Check Using BTS Site Manager BTS Status and Alarms can also be checked by logging into the site using BTS Site Manager. STATUS ACTIVE ALARMS 14 Nokia Siemens Networks 2013
15 Common Alarms (1) 7651 BASE STATION OPERATION DEGRADED S1 SCTP Path Failure Check the connection to MME using IP connectivity test from BTS Site Manager. GTPU Path Failure Check the connection to S-GW using IP connecitivity test from BTS Site Manager. Failure in Optical RP3 Interface Check the optical cables connection between System Module and RF Module CELL OPERATION DEGRADED RF Module Failure Check/ replace the RF Module CELL NOTIFICATION TX Failure in MIMO Faulty Tx in RF module. Check/replace the RF Module or change dlmimomode to Single Tx to clear the alarm. 15 Nokia Siemens Networks 2013
16 Common Alarms (2) 7657 BASE STATION CONNECTIVITY DEGRADED Transport Layer Connection Failure in X2 Interface Check the connection to adjacent BTS using IP connectivity test from BTS Site Manager. Transport Layer Connection Failure in S1 Interface Check the connection to MME using IP connectivity test from BTS Site Manager. LOS/LOF on unit $U, Interface $IF Check the Transmission Module or the connection to the far end node. Synchronisation Lost Check the connection to the synchronization source BASE STATION NOTIFICATION BTS Reference Clock Missing Check the connection to the synchonization source. 16 Nokia Siemens Networks 2013
17 LTE Neighbour Definition & Creation - Intra-LTE Mobility - Inter-RAT Mobility 17 Nokia Siemens Networks 2013
18 LTE Mobility and Related Features in RL30 18 Nokia Siemens Networks 2013
19 LTE-WCDMA Interworking 19 Nokia Siemens Networks 2013
20 LTE-GSM Interworking 20 Nokia Siemens Networks 2013
21 RL40 Parameter Object Structure (Example objects) LNMME LNADJW LNADJG LNADJ neighbor enb LNBTS LNADJL serving enb LNREL max 32 per freq for CIO Total LNRELW LNRELG LNHOG serving enb cell LNCEL 0..6 LNHOW LNHOIF REDRT IAFIM IRFIM UFFIM GFIM CDFIM Nokia Siemens Networks 2013
22 Idle Mode Mobility Parameter in enb Database LNBTS [LTE Basestation RNW parameters] 1 6 LNCEL [LTE BTS LNCELL RNW parameters] [LTE BTS LNCELL RNW parameters] [LTE BTS LNCELL RNW parameters] [LTE BTS LNCELL RNW parameters] [LTE BTS LNCELL RNW parameters] [LTE BTS CELL RNW parameters] 8 IAFIM IntrA Frequency Idle Mode parameters 1 IRFIM IRFIM IRFIM InteR InteR InteR Frequency Frequency Frequency Idle Mode Idle parameters Mode Idle parameters Mode parameters UFFIM UTRAN FDD Frequency Idle Mode parameters CDFIM CDMA200 Frequency Idle Mode parameters GFIM GERAN Frequency Idle Mode parameters GNFL GNFL GNFL GERAN Neighbor GERAN Frequency Neighbor List Frequency parameters GERAN Neighbor List Frequency parameters List parameters Nokia Siemens Networks 2013
23 Idle mode mobility L1800 FDD Abs Priority 6 UMTS Abs Priority 3 Always meas LTE (SIB19) Reselect L1800 if L1800 RSRP > -120 Start Measure Inter Freq / RAT if L1800 RSRP < -120 Reselect UMTS if L1800 RSRP < -124 and UMTS RSCP > -105 and UMTS ECNO > -16dB GSM Abs Priority 0 Always meas UMTS (QSearchI) Reselect UMTS if UMTS ECNO > -12dB Reselect GSM if L1800 RSRP < -124 and RxLev > Nokia Siemens Networks 2013
24 Idle mode mobility No Operation Function Managed Object Parameter Name Planned Internal Value GUI Value 1 LTE_LNCEL_SIB qrxlevmin dbm 2 LTE_LNCEL qrxlevminoffset db 3 LTE_LNCEL_SIB pmaxowncell dbm 4 LTE_LNCEL_SIB cellreselprio LTE_IRFIM eutcelresprio Not Used LTE_UFFIM_UTRFDDCARFRQL ucelresprio S-Criteria 7 LTE_GNFL gcelresprio LTE_CDFIM_HRPDBDCLLIST hrpdcresprio Not Used LTE_CDFIM_RTTBDCLLIST rttcresprio Not Used LTE_LNCEL_SIB Sintrasearch db 11 LTE_LNCEL_SIB snonintrsearch db 12 UE class specific max UL Tx power Cat dbm 13 LTE_LNCEL qhyst db 14 LTE_IAFIM_INTRFRNCLIST qoffsetcell Not Used - - db 15 LTE_LNCEL treseleutr second 16 LTE_IRFIM_INTFRNCLIST qoffcell Not Used Not Used - db 17 LTE_IRFIM qofffrq Not Used Not Used - db 18 LTE_IRFIM interfrqthrh Not Used Not Used - db 19 LTE_IRFIM qrxlevmininterf Not Used Not Used - dbm 20 LTE_IRFIM intertreseut Not Used Not Used - second 21 IDLE MODE LTE_IRFIM interfrqthrl Not Used Not Used - db R-Criteria 22 LTE_UFFIM_UTRFDDCARFRQL qrxlevminutra dbm 23 LTE_UFFIM_UTRFDDCARFRQL qqualminutra db 24 LTE_UFFIM_UTRFDDCARFRQL pmaxutra dbm 25 LTE_UFFIM_UTRFDDCARFRQL ucelresprio LTE_UFFIM_UTRFDDCARFRQL utrafrqthrh db 27 LTE_UFFIM_UTRFDDCARFRQL utrafrqthrl db 28 LTE_UFFIM_UTRFDDCARFRQL dlcarfrqutra F1-29 LTE_LNCEL_SIB threshsrvlow db 30 LTE_LNCEL_SIB intrfrqcelres Not Used 0 allowed - 31 HOPL AdjLQrxlevminEUTRA dbm 32 HOPL AdjLAbsPrioCellReselec HOPL AdjLThreshigh db 34 HOPL AdjLThreslow db 35 WCEL_SIB AbsPrioCellReselec G--> LTE WCEL_SIB LTECellReselection 1 1 TRUE - 37 WCEL_SIB Sprioritysearch db 38 WCEL_SIB Sprioritysearch db 39 WCEL_SIB Threshservlow db 40 RNFC EUTRAdetection 1 1 TRUE - 41 RNC SIB19Priority Unit in GUI 24 Nokia Siemens Networks 2013
25 Connected Mode Mobility Parameter in enb Database LNBTS [LTE Basestation RNW parameters] 6 1 LNCEL LNCEL LNCEL LTE BTS CELL LTE RNW BTS parameters CELL LTE RNW BTS CELL parameters RNW parameters LNADJW LNADJW LNADJWNeighboring Neighboring WCDMA Cell Neighboring WCDMA Cell WCDMA Cell 32 LNADJG LNADJG LNADJG Neighboring Neighboring GERAN BTS Cell Neighboring GERAN BTS Cell GERAN BTS Cell 32 LNADJ Neighboring LNADJ LNADJ LTE Neighboring BTS LTE Neighboring BTS LTE BTS LNHOIF LNHOIF LNHOIF Handover Handover Handover parameters parameters parameters to neighboring to neighboring to neighboring Interfrequency Interfrequency Interfrequency LTE Cell LTE Cell LTE Cell 1 16 LNHOG LNHOG LNHOG Handover Handover Handover parameters parameters parameters to neighboring to neighboring to neighboring GERAN BTS GERAN Cell BTS GERAN Cell BTS Cell 1 6 LNHOW LNHOW Handover Handover parameters parameters to to neighboring to neighboring WCDMA BTS WCDMA WCDMA BTS Cell BTS Cell Cell 1 16 LNREL LNREL LNREL LTE LTE LTE neighbor neighbor neighbor relation relation relation REDRT Redirection target parameters LNADJL LNADJL LNADJL Neighboring Neighboring Neighboring LTE BTS Cell LTE BTS Cell LTE BTS Cell Nokia Siemens Networks 2013
26 Dedicated mode mobility L1800 FDD Abs Priority 6 UMTS Abs Priority 3 GSM Abs Priority 0 Reselect L1800 if L1800 RSRP > -120 Only when UMTS in URA/CELL PCH / Idle Mode HO to UMTS when Ec/No > -10 and RSCP > -95 Note : for some 2G Cells Always meas LTE (SIB19) Always meas UMTS (QSearchC) Start Measure UMTS if L1800 RSRP < HO to UMTS via PS Handover (using RSCP) L1800 RSRP < -110 and UMTS RSCP > -96 and Start Compressed Mode (RT) if UMTS RSCP < -105 or Ec/No < -14 (NRT/HSDPA) RSCP < -110 or Ec/No < -16 HO to UMTS via Redirection (using RSCP) L1800 RSRP < -120 HO to GSM GSM RxLev > Nokia Siemens Networks 2013
27 Dedicated mode mobility No Operation Function Managed Object Parameter Name Planned Internal Unit in GUI Value Value GUI 1 LTE_LNCEL_HC threshold dbm 2 LTE_LNCEL_HC threshold2interfreq Not Used 98 Not Used db 3 LTE_LNCEL_HC threshold2wcdma dbm 4 LTE_LNCEL_HC threshold2geran Not Used dbm 5 ACTIVATE LTE_LNCEL_HC hysthreshold2interfreq Not Used 0 0 db 6 MEASUREMENT LTE_LNCEL_HC hysthreshold2wcdma db 7 LTE_LNCEL_HC hysthreshold2geran db 8 LTE_LNCEL_HC a2timetotriggeractinterfreqmeas ms 9 LTE_LNCEL_HC a2timetotriggeractwcdmameas ms 10 LTE_LNCEL_HC a2timetotriggeractgeranmeas ms 11 LTE_LNCEL_HC threshold2a dbm DE-ACTIVATE 12 LTE_LNCEL_HC hysthreshold2a db MEASUREMENT 13 LTE_LNCEL_HC a1timetotriggerdeactintermeas ms 14 LTE_LNCEL_HC enablebettercellho TRUE 1 TRUE - 15 LTE_LNCEL_HC a3offset db BETTER CELL-HO 16 LTE_LNCEL_HC a3timetotrigger ms 17 LTE_LNCEL_HC a3reportinterval ms 18 LTE_LNCEL_HC enablecovho TRUE 1 TRUE - 19 LTE_LNCEL_HC threshold dbm 20 LTE_LNCEL_HC threshold3a dbm COVERAGE HO 21 Connected LTE_LNCEL_HC a5timetotrigger ms 22 Mode LTE_LNCEL_HC a5reportinterval ms 23 LTE_LNCEL_HC hysthreshold db 24 LTE_LNBTS actltes1ho TRUE 1 TRUE - S1-HO 25 LTE_LNBTS priotopoho 0 0 all equal - 26 LTE_LNBTS actifho 0 0 disabled - 27 LTE_LNHOIF eutracarrierinfo Not Used LTE_LNHOIF hysa3offsetrsrpinterfreq Not Used - - db 29 LTE_LNHOIF hysa3offsetrsrqinterfreq Not Used - - db 30 LTE_LNHOIF measquantinterfreq Not Used LTE_LNHOIF a3timetotriggerrsrpinterfreq Not Used - - ms 32 LTE_LNHOIF a3timetotriggerrsrqinterfreq Not Used - - ms 33 LTE_LNHOIF a3offsetrsrpinterfreq Not Used - - db 34 INTER FREQ HO LTE_LNHOIF a3offsetrsrqinterfreq Not Used - - db 35 LTE_LNHOIF a3reportintervalrsrpinterfreq Not Used - - ms 36 LTE_LNHOIF a3reportintervalrsrqinterfreq Not Used - - ms 37 LTE_LNHOIF measquantinterfreq Not Used LTE_LNHOIF hysthreshold3interfreq Not Used - - db 39 LTE_LNHOIF threshold3ainterfreq Not Used - - dbm 40 LTE_LNHOIF threshold3interfreq Not Used - - dbm 41 LTE_LNHOIF a5timetotriggerinterfreq Not Used - - ms 42 LTE_LNHOIF a5reportintervalinterfreq Not Used - - ms 27 Nokia Siemens Networks 2013
28 Dedicated mode mobility No Operation Function Managed Object Parameter Name Planned Internal Value GUI Value 43 LTE_LNCEL_HC cellindoffserv default 15 0 db 44 LTE_LNREL cellindoffneigh default 15 0 db LTE Mobility Offsets 45 LTE_LNCEL_HC offsetfreqintra default 15 0 db 46 LTE_LNHOIF offsetfreqinter Not Used - - db 47 LTE_LNBTS actredirect Enabled 1 Enabled - 48 LTE_LNCEL_HC threshold dbm 49 LTE_LNCEL_HC a2timetotriggerredirect ms ReDirection 50 LTE_LNCEL_HC hysthreshold db 51 LTE_MODRED redirrat 2 2 utrafdd - 52 LTE_MODRED redirfrequtra F1-53 LTE_LNBTS acthotowcdma 1 1 TRUE - 54 LTE_LNCEL_HC measquantityutra 0 0 cpichrscp - Connected Mode 55 LTE_LNCEL_HC measquantitycsfbutra 0 0 cpichrscp - 56 LTE_LNHOW b1timetotriggercsfbutrameas ms 57 LTE_LNHOW b1thresholdcsfbutraecn db 58 LTE_LNHOW b1thresholdcsfbutrarscp dbm 59 LTE_LNHOW hysb1thresholdcsfbutra db LTE to UMTS (PS HO) 60 LTE_LNHOW b2timetotriggerutrameas ms 61 LTE_LNHOW hysb2thresholdutra db 62 LTE_LNHOW b2threshold1utra dbm 63 LTE_LNHOW b2threshold2utrarscp dbm 64 LTE_LNHOW b2threshold2utraecn db 65 LTE_LNHOW reportintervalutra ms 66 LTE_LNHOW utracarrierfreq F2 - Unit in GUI 28 Nokia Siemens Networks 2013
29 Intra-LTE Connected Mode Mobility via X2 (1) 1. Create LNADJ LNADJ can be created via BTS Site Manager : Required information from neighbour cell : c-plane IP address enb ID or via plan using CM Editor. 29 Nokia Siemens Networks 2013
30 Intra-LTE Connected Mode Mobility via X2 (2) 2. LNADJL and LNREL creation If X2 link is available, LNADJL will be created automatically by system during initial X2 setup procedure. LNREL will also be created automatically by system. 30 Nokia Siemens Networks 2013
31 Intra-LTE Connected Mode Mobility via S1 (1) 1. Activate Intra-LTE S1 Based Handover 2. Create LNADJ The same as LNADJ creation for X2-based Handover, but C-Plane IP address control must be set to enbcontrolled. 31 Nokia Siemens Networks 2013
32 Intra-LTE Connected Mode Mobility via S1 (2) 3. Create LNADJL & Primary PLMN ID of Neighbour enb 4. LNREL creation LNREL will be created automatically by system. 32 Nokia Siemens Networks 2013
33 Idle Mode Mobility from LTE to WCDMA 1. Activate SIB6 SIB6 contains information about UTRA frequencies and UTRA neighbouring cells relevant for cell-reselection. The parameters are grouped in UFFIM object. 2. Create UFFIM UFFIM = UTRAN FDD Frequency Idle Mode Parameters. Up to 16 WCDMA FDD Frequency Groups can be broadcasted. 33 Nokia Siemens Networks 2013
34 Idle Mode Mobility from LTE to GSM 1. Activate SIB7 SIB7 contains information about GERAN frequencies relevant for cell-reselection. The parameters are grouped in GFFIM and GNFL object. 2. Create GFIM & GNL GFIM = GERAN Frequency Idle Mode Parameters. GNFL = GERAN Neighbour Frequency List Parameters. Up to 16 GERAN Frequency Layers can be broadcasted. 34 Nokia Siemens Networks 2013
35 RRC Connection Release with Redirect & CSFB via Redirect 1. Activate RRC Connection Release with Redirect Feature 2. Activate CSFB to UTRAN/GSM via Redirect Feature 3. Create REDRT Depending on target RAT for redirection, target RAT parameters must be set in REDRT. Up to 6 REDRT can be defined. Target : 3G Target : 2G 35 Nokia Siemens Networks 2013
36 PS Handover to WCDMA (1) 1. Activate PS Handover to WCDMA 2. Create LNADJW Up to 32 LNADJW can be defined. 36 Nokia Siemens Networks 2013
37 PS Handover to WCDMA (2) 3. Create LNHOW LNHOW contains information about WCDMA thresholds and timers for predefined set of ARFCNs. Up to 16 LNHOW profile can be defined. 37 Nokia Siemens Networks 2013
38 38 Nokia Siemens Networks 2013 LTE Parameter Consistency Check
39 Parameter Dump Object Classes Network Element 39 Nokia Siemens Networks 2013
40 Parameter Consistency Check Parameter Template (e.g. Golden Parameter, NPT, etc.) Actual Parameter (from Dump) LNBTS LNCEL REDRT UFFIM Features activation E.g. : - actredirect - actcsfbredir - actltes1ho - acthotowcdma Admission Control E.g. : - maxnumactue - maxnumrrc Handover Control E.g. : - threshold/offset/ timer for handover Packet Scheduler E.g. : - dlamcenable - dl64qamenable - dlmimomode - maxnumuedl - maxnrsympdcch Redirection to 3G/2G E.g. : - redirrat - redirfrequtra - csfallbprio - redirectprio Idle Mode Mobility to 3G E.g. : - dlcarfrqutra - qqualminutra - qrxlevminutra - ucelresprio Random Access E.g. : - prachcs - prachconfindex Power Control E.g. : - ulpcenable 40 Nokia Siemens Networks 2013
41 41 Nokia Siemens Networks 2013 LTE Drive Test & Analysis
42 Drive Test Output The following problems can be detected from drive test. Overshooting. Pilot Pollution. Missing Neighbour. Un-optimized Parameters. 42 Nokia Siemens Networks 2013
43 Pilot Pollution What is Pilot Pollution? Less than 3-5 db different RSRP among PCIs are considered as potential interfering PCIs. How to detect? Based on drive test log. Check serving PCI versus Top 4 PCIs. Less than 3-5 db different RSRP among PCIs are considered as potential interfering PCIs. Count PCIs less than 5 db RSRP different. Count 3 ~ 4 PCIs should be considered for antenna optimization. 43 Nokia Siemens Networks 2013
44 Pilot Pollution DL Radio Quality Possible problems : Reduction of SINR Increase of DL interference from other cells Frequent handover Lower SINR area is matched together with multiple PCIs area 44 Nokia Siemens Networks 2013
45 Pilot Pollution UL Radio Quality In area with low RSRP, UL Power Headroom is limited. 45 Nokia Siemens Networks 2013
46 Pilot Pollution Counted PCIs Pollution RSRP There are 4 ~ 6 PCIs with less than 3 db different of RSRP. 46 Nokia Siemens Networks 2013
47 Pilot Pollution After Antenna Downtilting Before After After antenna downtilting, SINR is improving. 47 Nokia Siemens Networks 2013
48 Pilot Pollution After Antenna Downtilting Before After The number of Handover attempts has been reduced which is indicating more clear dominant areas after antenna downtilting. 48 Nokia Siemens Networks 2013
49 Pilot Pollution After Antenna Tilting Before After Before After SINR improvement is around 2 db. 49 Nokia Siemens Networks 2013
50 Pilot Pollution After Antenna Tilting 50 Nokia Siemens Networks 2013
51 Missing Neighbour How to detect? Perform drive test (PING test should be enough). Consider measurement reports without Handover command as missing neighbours. Monitor Handover performance from drive test and KPIs. Monitor other KPIs (such as CSSR, Drop Rate, Early Handover, Late Handover, etc.). 51 Nokia Siemens Networks 2013
52 Missing Neighbour Measurement Reports without Handover Command A lot of Measurement Reports but no Handover Command Serving PCI Missing Neighbour PCI Source enb ID Target enb ID Target enb c-plane ip address UE is reporting to the serving cell (PCI 501) a neighbour cell (PCI 449) with stronger signal. Create LNADJ 52 Nokia Siemens Networks 2013
53 53 Nokia Siemens Networks 2013 LTE KPI & Performance Analysis
54 KPI Formula KPI Name KPI ID Formula Cell Availability LTE_5750a 100*sum(SAMPLES_CELL_AVAIL)/sum(DENOM_CELL_AVAIL) RRC Setup Success Ratio LTE_5218c 100*sum([SIGN_CONN_ESTAB_COMP]) / sum([sign_conn_estab_att_mo_s]+ [SIGN_CONN_ESTAB_ATT_MT]+ [SIGN_CONN_ESTAB_ATT_MO_D]+ [SIGN_CONN_ESTAB_ATT_OTHERS] + [SIGN_CONN_ESTAB_ATT_EMG]) E-RAB Setup Success Ratio LTE_5017a 100*(EPS_BEARER_SETUP_COMPLETIONS) / (EPS_BEARER_SETUP_ATTEMPTS) E-RAB Drop Ratio LTE_5025b 100*sum(ENB_EPS_BEARER_REL_REQ_RNL + ENB_EPS_BEARER_REL_REQ_TNL + ENB_EPS_BEARER_REL_REQ_OTH) / sum(epc_eps_bearer_rel_req_norm + EPC_EPS_BEARER_REL_REQ_DETACH + EPC_EPS_BEARER_REL_REQ_RNL + EPC_EPS_BEARER_REL_REQ_OTH + ENB_EPSBEAR_REL_REQ_RNL_REDIR + ENB_EPS_BEARER_REL_REQ_NORM + ENB_EPS_BEARER_REL_REQ_RNL + ENB_EPS_BEARER_REL_REQ_TNL + ENB_EPS_BEARER_REL_REQ_OTH) Intra enb HO Success Ratio, Total Inter enb HO Success Ratio, Total LTE_5043a 100*(SUCC_INTRA_ENB_HO) / (INTRA_ENB_HO_PREP) LTE_5058b 100*(SUCC_INTER_ENB_HO) / (INTER_ENB_HO_PREP) 54 Nokia Siemens Networks 2013
55 Reports & KPI Cell Availability RSLTE000 System Program (Cell Level) RSLTE004 Network Access Service Access and RRC RSLTE037 Service Retainability RRC Setup Success Rate E-RAB Setup Success Rate E-RAB DropRate RSLTE005 HO Analysis RSLTE031 Neighbour HO Analysis RSLTE024 RSSI for PUSCH RSLTE025 SINR for PUSCH RSLTE019 Power Intra-eNB HO Success Rate Inter-eNB HO Success Rate PCI Confusion Uplink Interference Radio Quality 55 Nokia Siemens Networks 2013
56 OSS Statistics 56 Nokia Siemens Networks 2013
57 PCI Planning Review Mod3 Violation Site Info : Site location & type Antenna azimuth PCI PCI 318 & PCI 321 have the same mod3 i.e Nokia Siemens Networks 2013 Solution: Change PCI 321 to 322 and PCI 322 to 321.
58 Root Sequence Index (RSI) Planning Review RSI Collision Site Info : Site location & type Antenna azimuth Root Sequence Index Root Sequence Index 100 collisions. Solution : Change Root Sequence Index of LNCEL 394 from 100 to Nokia Siemens Networks 2013
59 E-RAB Drop Rate [%] E-RAB Drop Count per Cause :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00: :00:00 RRC Setup Success Rate [%] RRC Timer Expiry [%] External UL Interference RRC CSSR (LTE_5218c) RRC Timer Expiry (LTE_5229b) Avg. RSSI for PUSCH Max. RSSI for PUSCH Avg. SINR for PUSCH Low SINR High RSSI E-RAB Drop Rate (LTE_5025b) RNL, enb init (M8006C12) TNL, enb init (M8006C14) OTH, enb init (M8006C13) RNL, EPC init (M8006C8) OTH, EPC init (M8006C9) 6,000 5,000 4,000 3,000 2,000 1, Low SINR. -Very high Max. PUSCH RSSI i.e. > -40 dbm. -Possible external interference. 59 Nokia Siemens Networks 2013
60 External UL Interference Interference wave happens frequently causing PRACH failure. CSSR and Call Drop are impacted. Handover toward LNCEL are also impacted. Source Target HO Attempt HO Success Rate LNBTS name LNCEL name LNBTS name LNCEL name NL_BSbujeondoseokwanA0 61 NL_BSbujeondoseokwanA NL_BSbujeondoseokwanA0 62 NL_BSbujeondoseokwanA NL_BSbujeondoseokwanA0 63 NL_BSbujeondoseokwanA NL_BSbujeondoseokwanA0 65 NL_BSbujeondoseokwanA NL_BSbujeondoseokwanA1 384 NL_BSbujeondoseokwanA NL_BSbujeondoseokwanA1 385 NL_BSbujeondoseokwanA NL_BSbujeonrotaryB NL_BSbujeondoseokwanA NL_BSbujeonrotaryB NL_BSbujeondoseokwanA NL_BSseomyontaehwaA0 70 NL_BSbujeondoseokwanA NL_BSseomyontaehwaA0 71 NL_BSbujeondoseokwanA NL_BSseomyontaehwaA0 72 NL_BSbujeondoseokwanA NL_BSseomyontaehwaA0 75 NL_BSbujeondoseokwanA NL_BSseomyontaehwaA1 410 NL_BSbujeondoseokwanA NL_BSseomyontaehwaA1 412 NL_BSbujeondoseokwanA NL_BSseomyontaehwaA1 413 NL_BSbujeondoseokwanA Nokia Siemens Networks 2013
61 LNADJ Management Addition of LNADJ needs to be added by NetAct in bi-directional way. Number of LNADJ needs to be managed and monitored. Deletion of LNADJ needs to be checked in both direction : No outgoing handover attempt No incoming hanodver attempt 61 Nokia Siemens Networks 2013
62 Wrong LNADJ Wrong neighbour configured. Correction : LNADJ Deletion : LNADJ Addition : Nokia Siemens Networks 2013 Irwan Radius /
63 Parameter Optimization RRC Setup Failures The reason for the BTS not receiving the RRC Connection Setup Complete can be as follows: DL UE does not hear the contention resolution or RRC Connection Setup message 53% of analysed RRC setup failures are due to DL problems 63 Nokia Siemens Networks 2013
64 Parameter Optimization RRC Setup Failures 64 Nokia Siemens Networks 2013
65 Check List Summary INPUT PROBLEM ACTION EFFECT Drive Test Coverage Analysis/ Overshooting Antenna Downtilting RRC Setup Success Rate Pilot Pollution Parameter Recommendation RACH Success Rate Un-optimized Parameter Adding Missing Neighbour E-RAB Drop Rate Missing Neighbour Parameter Dump Parameter Inconsistency PCI Mod3 Violation Consistency Check PCI Re-assignment HO Success Rate S1 HO Trigger 0 Root Sequence Index Collision Root Sequence Index Re-assignment Throughput Unknown Problems OSS Statistics PCI Confusion Uplink Interference External Noise Clean-up 65 Nokia Siemens Networks 2013
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