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Knowledge Sharing - Mobility_Strategy.pdf

The document provides a high-level summary and proposed strategy for mobility and traffic steering across 2G, 3G, and 4G networks. It analyzes the current configuration and proposes updated thresholds and parameters to optimize idle and connected mode mobility between different radio access technologies and frequency layers. The proposed strategy includes adjusting cell reselection, handover, and load balancing parameters to improve coverage and throughput. Four scenarios are outlined to implement a full U900 layer that incorporate different 3G frequency layer configurations along with 2G and 4G.

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MOBILITY & traffic steering STRATEGY review ASHITEI ASHIBOE-MENSAH MMEA MS NDO AFRICA 2020-02-10
Ericsson Internal | 2018-02-21 GSMHIGH-LEVELSUMMARY ➢ Add Missing UMFIs for Co-located 3G cells ➢ Add missing EARFCNs for Co-located 4G cells ➢ Legacy Cell Reselection ▪ QSI (7 = ALWAYS) ▪ FDDQMIN (6 = -14dB) ▪ FDDQOFF (0 = INFINITY) ▪ FDDRSCPMIN (4/3 = -106/-108 dBm) ➢ Priority-Based Cell Reselction ▪ PRIOCR ▪ RATPRIO ▪ FASTRETLTE ▪ FASTRET3G ▪ COVERAGEE (GOOD) ▪ COVERAGEU (GOOD) ▪ HPRIOTHR (for 4G)(4 = 8 dB) ▪ QRXLEVMINE (8 = -124 dBm) ▪ HPRIOTHR (for 3G)(3 = 6 dB) ▪ QRXLEVMINU (2 = -115 dBm)
Ericsson Internal | 2018-02-21 WCDMAHIGH-LEVELSUMMARY ➢ Add missing EutranFreqRelations for Co-located 4G cells ➢ Legacy Cell Reselection ▪ qOffset1sn (50 dB for GsmRelations) ▪ qOffset2sn ▪ qHyst1 (4 dB) ▪ qHyst2 (2 dB) ▪ sRatSearch (2 dB) ➢ Priority-Based Cell Reselction ▪ EutranFreqRelation.CellReselectionPriority ▪ EutranFreqRelation.threshHigh (6 dB) ▪ EutranFreqRelation.qRxLevmin (-124 dBm) ➢ dlCodePwrCm (usedFreqThresh2dEcno = -24 dB) ➢ releaseRedirectEutraTriggers (Manage Fast Return from 3G to 4G) ➢ UeRc Settings (Prevent PS Traffic from moving from 3G to 2G) ▪ gsmHoAllowed (0 for PS-Only UeRcs) ▪ ifhoAllowed (0 for PS-Only UeRcs) ▪ serviceOffset2dEcno (-20 for PS-Only UeRcs) ▪ serviceOffset2dRscp (-50 for PS-Only UeRcs) ➢ RabCombinations (Disable Higher-order R99 RABs) ➢ IFLS (Proper Load Balancing between 3G Layers) ▪ iflsHyst (10/5) ▪ hsIflsMarginUsers (50 for U900 cells) ▪ hsIflsThreshUsers ▪ iflsCpichEcnoThresh (-16 dB) ▪ pathlossThreshold (110 for U900; 130 for U2100)
Ericsson Internal | 2018-02-21 LTEHIGH-LEVELSUMMARY ➢ Pre-Requisite Mobility Features ▪ WCDMA Session Continuity / InterFreq Handover / MCPC / InterFreq Load Balancing Idle Mode Mobility (See slide 6) ➢ Start IRAT (or Low Priority LTE Freq) Measurements in Idle Mode (-124 dBm) (EUtranCellFdd.systeminformationblock3.sNonIntraSearch) ➢ Required Serving LTE Cell Threshold for Idle Mode Fallback to WCDMA (-124 dBm) (EUtranCellFdd.threshServingLow) ➢ Required Target LTE Cell Level from LLow to LHi (-118 dBm) (EUtranFreqRelation.threshXHigh) ➢ Required Target LTE Cell Level from LHi to LLow (-112 dBm) (EUtranFreqRelation.threshXLow) Connected Mode Mobility (See slides 7,8 & 9) ➢ MCPC A1 Good Coverage (LLow = -110 dBm; LHi = -113 dBm) ➢ MCPC A2 Inner Search (LLow = -114 dBm; LHi = -117 dBm) ➢ MCPC A5 Threshold 1 (LLow = -114 dBm; LHi = -117 dBm) ➢ MCPC A5 Threshold 2 (LLow = -115 dBm; LHi = -110 dBm) ➢ MCPC A2 Outer Seacrh (-122 dBm for both LLow & LHi) ➢ MCPC B2 Threshold 1 (-122 dBm for both LLow & LHi) ➢ MCPC B2 Threshold 2 (-107 dBm for target WCDMA Cell) ➢ MCPC Critical Coverage (-131 dBm for both LLow & LHi) ➢ IFLB-Triggered A5 Threshold 1 (LLow = -45 dBm; LHi = -114 dBm) ➢ IFLB-Triggered A5 Threshold 2 (LLow = -116 dBm; LHi = -105 dBm) ➢ IFLB Functionality Settings ▪ LoadBalancingFunction.lbCeiling ▪ LoadBalancingFunction.lbThreshold ▪ EUtranCellFDD.cellSubscriptionCapacity ▪ QciProfilePredefined.qciSubscriptionQuanta
SAMPLe 4G Mobility & load balancing findings & proposed STRATEGY
Ericsson Internal | 2018-02-21 Current: L1800 RSRP < -116/-102 dBm (Proposed: L800 < -124 dBm) Current: L2600 RSRP < -116/-102 dBm (Proposed: L2600 < -126 dBm) 3G 3G:qRxLevMin : -115 dBm 4G:qRxLevMin=-122 (Proposed=-124) qQualMin: Current = -18 dB; Proposed = -20 dB 4G Mobility Overview Proposal – Idle Mode Reselection or Redirection Current: L1800 RSRP > -112/-114/-118 L2600 RSRP > -112 (Proposed: > -118) Target Priority 3/2 LEGEND 7/6 L2600=20 MHz & L1800=10 MHz Current: qRxLevMin : -120/-122 dBm Proposed qRxLevMin: L2600=-126; L1800=-124 Current: All WCDMA RSCP/EcNo values Current: WCDMA RSCP > -113/-111 dBm (Proposed: WCDMA RSCP > -110 dBm) 2G 3G: qRxLevMin : -115 dBm 4$: qRxLevMinE: -124 dBm 1 L2600 L1800 RSRP < -102/-116 (Proposed: < -126) RSRP > -112/-116 (Proposed: > -118) RSRP : All Levels 6 U2100 F1 & F2 U900 F3 Priority : 3 Priority : 3 (2) qOffset2sn Current: 0 dB qOffset2sn Current: 0 dB (Proposed: 3dB) (Proposed: 0dB) FASTRETLTE (G2L) Old: RSRP > -110 dBm Proposed: RSRP > -116 dBm gsmRelation.qOffset1Sn Current = 7 dB (Proposed: 50 dB) Current: EcNo/RSCP > -12 dB/-102 dBm Proposed: EcNo/RSCP > -14 dB/-106 dBm FASTRET3G (G2U) 3G RSCP > -111 dBm Current: Measure WCDMA @ RSRP < -118/-110 dBm Proposed: RSRP < -124 (L1800) Proposed: RSRP < -126 (L2600) Current: Measure GSM @ RSCP < -116 dB (Proposed: RSCP < -118 dB) 7 RSRP < -114/-120 (Proposed: < -112) Measure L1800: Current: < -118/-110 (Proposed: < -120/-126) X
Ericsson Internal | 2018-02-21 ConnectedMode–TELMAMD L1800MCPCThresholds Inner Search zone Outer Search zone Good Coverage Proposed A1 Thresh = -110 (Current = -112 ) Proposed A2 Inner Search Thresh = -114 (current = -116 ) L1800 MCPC Proposed Outer Search Thresh = -122 (Current = -116 ) Proposed Critical Cov = -131 (Current= -121/-141 ) A5 Threshold 1 (Source Cell): Current: < -111 dBm Proposed: < -114 dBm A5 Threshold 2 (Target Cell): Current: > -109 dBm Proposed: > -115 dBm B2 Threshold 1 (Source Cell): Current: < -115 to -122 dBm Proposed: < -122 dBm B2 Threshold 2 (Target Cell): Current: > -109 to -116 dBm Proposed: > -107 dBm A5 B2 L2600 W2100 L1800 G900 U900
Ericsson Internal | 2018-02-21 ConnectedMode–TELMAMD L2600MCPCThresholds Inner Search zone Outer Search zone Good Coverage Proposed A1 Thresh = -113 (Current = -112 ) Proposed A2 Inner Search Thresh = -117 (current = -116 ) Proposed Outer Search Thresh = -122 (Current = -116 ) Proposed Critical Cov = -131 (Current= -121/-141 ) A5 Threshold 1 (Source Cell): Current: < -111 dBm Proposed: < -117 dBm A5 Threshold 2 (Target Cell): Current: > -109 dBm Proposed: > -110 dBm B2 Threshold 1 (Source Cell): Current: < -115 to -122 dBm Proposed: < -122 dBm B2 Threshold 2 (Target Cell): Current: > -109 to -116 dBm Proposed: > -107 dBm A5 B2 L2600 MCPC L2600 W2100 L1800 G900 U900
Ericsson Internal | 2018-02-21 4G – L2600 Mobility Overview Proposal: LTE Inter-Frequency Load Balancing (Connected Mode) Inter-Freq - Load Balancing 4G – L1800 Current: RSRP > -43 (Proposed: > -116) Current: RSRP < -45 (Proposed: < -118 ) Current: RSRP > -43 (Proposed: >-105 ) LEGEND Current: RSRP < -45 (Proposed: < -45 )
SAMPLE 3G Mobility & LOAD SHARING proposed STRATEGY
Ericsson Internal | Airtel Gabon Camping Strategy | 2018-09-27 | Page 11 Possible layer scenarios to be implemented when the full u900 layer is rolled out U2100-F1 GSM U2100-F2 LTE U2100-F1 GSM U2100-F2 LTE U2100-F1 GSM LTE GSM Scenario 1 U2100-F3 U900-F4 U900-F4 U900-F4 U900-F4 Scenario 2 Scenario 3 Scenario 4 U2100-F1
Ericsson Internal | Airtel Gabon Camping Strategy | 2018-09-27 | Page 12 Scenario 1 = Gsm+u900(1C)+U2100(3C)+L1800(1C)+L2600(1C) U2100 F2 (P3) IF-GSM-PREF U2100 F1 (P3) IF-GSM-PREF U2100 F2 (P3) IF-GSM-PREF U2100 F1 (P3) IF-GSM-PREF IFHO IRAT INTRA- FREQ HO & RE-SELECTION GSM (P1) GSM (P1) U900 F4 (P2) IF-GSM-PREF U900 F4 (P2) IF-GSM-PREF U2100 F3 (P3) IF-GSM-PREF U2100-F3 (P3) IF-GSM-PREF Inter-Freq + GSM Relations F1 → F2+U900 + IRAT (Same site + Neighbour site) F2 → F3+U900 + IRAT (Same site + Neighbour site) F3 → F1+U900 + IRAT (Same site + Neighbour site) U900 → F1+F2 + IRAT (Same site + Neighbour site) IRAT HO IRAT HO L800 (P6) LTE (P7/P7) IRAT HO IRAT HO IRAT IDLE RE-SELECTION RE-SELECTION RE-SELECTION RE-SELECTION RE-SELECTION LTE (P7/P6) CSFB CSFB CSFB to WCDMA Intra-Freq Relations (2-way) F1 → F1 (Same site + Neighbour site) F2 → F2 (Same site + Neighbour site) F3 → F3 (Same site + Neighbour site) U900 → U900 (Same site + Neighbour site)
Ashitei Ashiboe-Mensah | 2019-01-24 | Movicel Angola Reselection, Mobility & Traffic Steering Audit | | Page 13 Scenario 2 = GSM+u900(1C)+U2100(2C)+L1800(1C)+L2600(1C) U2100 F2 (P3) IF-GSM-PREF U2100 F1 (P3) IF-GSM-PREF U2100 F2 (P3) IF-GSM-PREF U2100 F1 (P3) IF-GSM-PREF IFHO IRAT INTRA- FREQ HO & RE-SELECTION GSM (P1) GSM (P1) U900 F3 (P2) IF-GSM-PREF U900 F3 (P2) IF-GSM-PREF Inter-Freq & GSM Relations F1 → F2+U900 + IRAT (Same site + Neighbour site) F2 → F1+U900 + IRAT (Same site + Neighbour site) U900 → F1+F2 + IRAT (Same site + Neighbour site) IRAT HO IRAT HO L800 (P6) LTE (P7/P6) IRAT HO IRAT HO IRAT IDLE RE-SELECTION RE-SELECTION RE-SELECTION RE-SELECTION RE-SELECTION LTE (P7/P6) CSFB CSFB CSFB to WCDMA Intra-Freq Relations (2-way) F1 → F1 (Same site + Neighbour site) F2 → F2 (Same site + Neighbour site) U900 → U900 (Same site + Neighbour site)
Ericsson Internal | Airtel Gabon Camping Strategy | 2018-09-27 | Page 14 Scenario 3 = GSM+u900(1C)+U2100(1C)+L1800(1C)+L2600(1C) U2100 F1 (P3) IF-GSM-PREF U2100 F1 (P3) IF-GSM-PREF IFHO IRAT INTRA- FREQ HO & RE-SELECTION GSM (P1) GSM (P1) U900 F2 (P2) IF-GSM-PREF U900 F2 (P2) IF-GSM-PREF Inter-Freq + GSM Relations F1 → U900 + IRAT (Same site + Neighbour site) U900 → F1 + IRAT (Same site + Neighbour site) IRAT HO IRAT HO L800 (P6) LTE (P7/P6) IRAT HO IRAT HO IRAT IDLE RE-SELECTION RE-SELECTION RE-SELECTION RE-SELECTION RE-SELECTION LTE (P7/P6) CSFB CSFB CSFB to WCDMA Intra-Freq Relations (2-way) F1 → F1 (Same site + Neighbour site) U900 → U900 (Same site + Neighbour site)
Ericsson Internal | Airtel Gabon Camping Strategy | 2018-09-27 | Page 15 Scenario 4 = gsm+u900(1C) + U2100(1C) U2100 F1 (P3) IF-GSM-PREF U2100 F1 (P3) IF-GSM-PREF IFHO IRAT INTRA- FREQ HO & RE-SELECTION GSM (P1) GSM (P1) U900 F2 (P2) IF-GSM-PREF U900 F2 (P2) IF-GSM-PREF Inter-Freq + GSM Relations F1 → U900 + IRAT (Same site + Neighbour site) U900 → F1 + IRAT (Same site + Neighbour site) IRAT HO IRAT HO IRAT IDLE RE-SELECTION RE-SELECTION RE-SELECTION CSFB to WCDMA Intra-Freq Relations (2-way) F1 → F1 (Same site + Neighbour site) U900 → U900 (Same site + Neighbour site)
Ashitei Ashiboe-Mensah | 2019-01-24 | Movicel Angola Reselection, Mobility & Traffic Steering Audit | | Page 16 Sib11 congestion – precautions to take SIB11 - SIB12 Indicator - FACH Measurement Occasion Information - Measurement Control System Information - Use of HCS - Cell Selection and Reselection Criteria - Intra-frequency measurement system information - Intra-frequency cell info list … - Inter-frequency measurement system information - InterFrequency Cell Info List … - Inter-RAT measurement system information -Inter Rat Cell Info List … ❑ Example of safe number to avoid SIB11 issues: ➢ max 22 INTRA, max 20 INTER, max 16 GSM ➢ Total of 58 max neighbours
Ashitei Ashiboe-Mensah | 2019-01-24 | Movicel Angola Reselection, Mobility & Traffic Steering Audit | | Page 17 Compressed mode strategy Downlink Code Power based Compressed Mode (W15B onwards) Background › Operator with growing/heavy HSPA traffic want to avoid unnecessary compressed mode and do not want to move connections to GSM if not needed Description › Introduces a new trigger for compressed mode, Downlink Radio Link Code Power – Replaces/ reduces the need for Ec/N0 as trigger for Compressed Mode Benefits › Reducing unnecessary triggering of Compressed Mode gives: – More WCDMA coverage – Reduced system load – Less IRAT Handovers RBS Node B GSM Coverage WCDMA Coverage Area where no compressed mode is triggered when Ec/No based trigger is replaced by Downlink Code Power Based CM
Ashitei Ashiboe-Mensah | 2019-01-24 | Movicel Angola Reselection, Mobility & Traffic Steering Audit | | Page 18 Feature Recommendations ➢ Activate Feature DCH/EUL Load Balancing (UL congested cells won’t be target of LS) ➢ Disable Feature DCH Load Sharing (Prevent Voice calls from being targeted by IFLS) ➢ Activate Feature FAJ 121 1880 HSDPA IFLS Capability and Priority Handling Proposed 3G load sharing strategy Overall Proposed Strategy ➢ Activate HS-IFLS (HspaLoadSharing) on all 3 WCDMA Layers ➢ Define Bi-Directional Co-Sector Coverage Relations in all WCDMA Layers ➢ Control load sharing between layers by tuning HS-IFLS parameters ▪ iflsHyst → (Lower the Hysteresis load criterion between the more loaded & the less loaded cells) ▪ hsIflsMarginUsers → (make U900 look more loaded than U2100 in reality before even starting HS-IFLS Evaluation) ▪ hsIflsThreshUsers → (Lower the HS-IFLS algorithm trigger threshold so as to increase the frequency of off-loading from U900) ▪ hsIflsSpeechMultiRabTrigg → (set to 0, so as to prevent Speech-inclusive MultiRabs from being targeted by HS-IFLS, thereby prevent possible dropped voice calls) ▪ iflsCpichEcnoThresh → Allow IFLS-triggered reconfigurations from FACH/URA to HSDPA only in good EcNo conditions ▪ iflsMode → Do not allow Up-switch Attempts to serve as HS-IFLS trigger on U900 cells towards U2100 cells (due to absence of pathloss checks during Up-switch attempts) ▪ pathlossThreshold → (make the pathloss criteria more strict for U900 than for U2100, thereby reduce probability of offloading traffic to U900)
Ashitei Ashiboe-Mensah | 2019-01-24 | Movicel Angola Reselection, Mobility & Traffic Steering Audit | | Page 19 U2100-F2 U2100-F1 HSIFLS HS IFLS U900-F3 F1 → F2 + U900 F2 → F1 + U900 U900 → F1 + F2 Source Target F1 F2 F1 U900 U900 F1 U900 F2 F2 F1 F2 U900 HSDPA Interfrequency Load Sharing (2/3) (HSdpa-IFLS) LEGEND ➢Define Bi-Directional Co-Sector Coverage Relations in all 3 Layers
Ericsson Internal | Airtel Gabon Camping Strategy | 2018-09-27 | Page 20 U2100-F2 U2100-F1 HSIFLS HS IFLS U900-F4 U2100-F3 F1 → F2 + F3 + U900 F2 → F1 + F3 + U900 F3 → F1 + F2 + U900 U900 → F1 + F2 + F3 Source Target F1 F2 F1 F3 F1 U900 U900 F1 U900 F2 U900 F3 F2 F1 F2 F3 F2 U900 F3 F2 F3 F1 F3 U900 HSDPA Interfrequency Load Sharing (3/3) (HSdpa-IFLS) LEGEND ➢Define Bi-Directional Co-Sector Coverage Relations in all 4 Layers
Ashitei Ashiboe-Mensah | 2019-01-24 | Movicel Angola Reselection, Mobility & Traffic Steering Audit | | Page 21 HSDPA Interfrequency Load Sharing (1/3) (HSdpa-IFLS) MO Parameter Proposed setting on RNC Proposed setting On U2100 cells Propsoed setting On U900 cells Handover iflsHyst 10 (can be set = 5) UtranCell hsIflsMarginUsers 0 50 (make U900 look 50% more loaded than in reality before starting IFLS Evaluation) UtranCell hsIflsThreshUsers 5 (can be set higher) 5 (can be set lower) UtranCell hsIflsSpeechMultiRabTrigg 0 (Currently 326 cells = 1) 0 (Currently 56 cells = 1) UtranCell iflsCpichEcnoThresh -14 (can be tuned further) -14 (can be tuned further) UtranCell iflsMode 2 (RAB_EST_AND_UPSWITCH_ATT) 0 (RAB_EST) (for more aggressive IFLS, set to 2) UtranCell pathlossThreshold 130 110 (can be tuned further) Eul pathlossThresholdEulTti2 135 135 › UE movement at Load Sharing is performed through Blind (no measurements) handover, and hence there is a chance for failure › If Blind HO fails, call isn’t dropped, it returns to source call => but this introduces delays in establishment that would impact user experience, specially for typical bursty behaviours
Ashitei Ashiboe-Mensah | 2019-01-24 | Movicel Angola Reselection, Mobility & Traffic Steering Audit | | Page 22 › U2100 layer is Multi-Carrier Capable. To take full advantage of the MC capabilities, this feature allows one to prioritize those U2100 carriers for the UEs that support MC, increasing overall user experience and throughput › But more importantly, it also adds an important improvement: – hsIflsSpeechMultiRabTrigg switch takes effect when the feature is activated – hsIflsSpeechMultiRabTrigg recommended to be set = OFF, else there is a risk of CS drops due to blind Handover › If a user has setup a speech call in a cell, and then tries to setup a HS connection to speech+HS, the cell parameter hsIflsSpeechMultiRabTrigg is checked to decide if HSDPA IFLS must trigger/evaluate or not. › Recommended to license and activate feature, and set hsIflsSpeechMultiRabTrigg = OFF › RncFeature=HsdpaIflsCapAndPrioHandling (must be ENABLED) HSDPA IFLS Capability and Priority Handling (W12b onwards)
Knowledge Sharing - Mobility_Strategy.pdf

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Knowledge Sharing - Mobility_Strategy.pdf

  • 1.
    MOBILITY & trafficsteering STRATEGY review ASHITEI ASHIBOE-MENSAH MMEA MS NDO AFRICA 2020-02-10
  • 2.
    Ericsson Internal |2018-02-21 GSMHIGH-LEVELSUMMARY ➢ Add Missing UMFIs for Co-located 3G cells ➢ Add missing EARFCNs for Co-located 4G cells ➢ Legacy Cell Reselection ▪ QSI (7 = ALWAYS) ▪ FDDQMIN (6 = -14dB) ▪ FDDQOFF (0 = INFINITY) ▪ FDDRSCPMIN (4/3 = -106/-108 dBm) ➢ Priority-Based Cell Reselction ▪ PRIOCR ▪ RATPRIO ▪ FASTRETLTE ▪ FASTRET3G ▪ COVERAGEE (GOOD) ▪ COVERAGEU (GOOD) ▪ HPRIOTHR (for 4G)(4 = 8 dB) ▪ QRXLEVMINE (8 = -124 dBm) ▪ HPRIOTHR (for 3G)(3 = 6 dB) ▪ QRXLEVMINU (2 = -115 dBm)
  • 3.
    Ericsson Internal |2018-02-21 WCDMAHIGH-LEVELSUMMARY ➢ Add missing EutranFreqRelations for Co-located 4G cells ➢ Legacy Cell Reselection ▪ qOffset1sn (50 dB for GsmRelations) ▪ qOffset2sn ▪ qHyst1 (4 dB) ▪ qHyst2 (2 dB) ▪ sRatSearch (2 dB) ➢ Priority-Based Cell Reselction ▪ EutranFreqRelation.CellReselectionPriority ▪ EutranFreqRelation.threshHigh (6 dB) ▪ EutranFreqRelation.qRxLevmin (-124 dBm) ➢ dlCodePwrCm (usedFreqThresh2dEcno = -24 dB) ➢ releaseRedirectEutraTriggers (Manage Fast Return from 3G to 4G) ➢ UeRc Settings (Prevent PS Traffic from moving from 3G to 2G) ▪ gsmHoAllowed (0 for PS-Only UeRcs) ▪ ifhoAllowed (0 for PS-Only UeRcs) ▪ serviceOffset2dEcno (-20 for PS-Only UeRcs) ▪ serviceOffset2dRscp (-50 for PS-Only UeRcs) ➢ RabCombinations (Disable Higher-order R99 RABs) ➢ IFLS (Proper Load Balancing between 3G Layers) ▪ iflsHyst (10/5) ▪ hsIflsMarginUsers (50 for U900 cells) ▪ hsIflsThreshUsers ▪ iflsCpichEcnoThresh (-16 dB) ▪ pathlossThreshold (110 for U900; 130 for U2100)
  • 4.
    Ericsson Internal |2018-02-21 LTEHIGH-LEVELSUMMARY ➢ Pre-Requisite Mobility Features ▪ WCDMA Session Continuity / InterFreq Handover / MCPC / InterFreq Load Balancing Idle Mode Mobility (See slide 6) ➢ Start IRAT (or Low Priority LTE Freq) Measurements in Idle Mode (-124 dBm) (EUtranCellFdd.systeminformationblock3.sNonIntraSearch) ➢ Required Serving LTE Cell Threshold for Idle Mode Fallback to WCDMA (-124 dBm) (EUtranCellFdd.threshServingLow) ➢ Required Target LTE Cell Level from LLow to LHi (-118 dBm) (EUtranFreqRelation.threshXHigh) ➢ Required Target LTE Cell Level from LHi to LLow (-112 dBm) (EUtranFreqRelation.threshXLow) Connected Mode Mobility (See slides 7,8 & 9) ➢ MCPC A1 Good Coverage (LLow = -110 dBm; LHi = -113 dBm) ➢ MCPC A2 Inner Search (LLow = -114 dBm; LHi = -117 dBm) ➢ MCPC A5 Threshold 1 (LLow = -114 dBm; LHi = -117 dBm) ➢ MCPC A5 Threshold 2 (LLow = -115 dBm; LHi = -110 dBm) ➢ MCPC A2 Outer Seacrh (-122 dBm for both LLow & LHi) ➢ MCPC B2 Threshold 1 (-122 dBm for both LLow & LHi) ➢ MCPC B2 Threshold 2 (-107 dBm for target WCDMA Cell) ➢ MCPC Critical Coverage (-131 dBm for both LLow & LHi) ➢ IFLB-Triggered A5 Threshold 1 (LLow = -45 dBm; LHi = -114 dBm) ➢ IFLB-Triggered A5 Threshold 2 (LLow = -116 dBm; LHi = -105 dBm) ➢ IFLB Functionality Settings ▪ LoadBalancingFunction.lbCeiling ▪ LoadBalancingFunction.lbThreshold ▪ EUtranCellFDD.cellSubscriptionCapacity ▪ QciProfilePredefined.qciSubscriptionQuanta
  • 5.
    SAMPLe 4G Mobility& load balancing findings & proposed STRATEGY
  • 6.
    Ericsson Internal |2018-02-21 Current: L1800 RSRP < -116/-102 dBm (Proposed: L800 < -124 dBm) Current: L2600 RSRP < -116/-102 dBm (Proposed: L2600 < -126 dBm) 3G 3G:qRxLevMin : -115 dBm 4G:qRxLevMin=-122 (Proposed=-124) qQualMin: Current = -18 dB; Proposed = -20 dB 4G Mobility Overview Proposal – Idle Mode Reselection or Redirection Current: L1800 RSRP > -112/-114/-118 L2600 RSRP > -112 (Proposed: > -118) Target Priority 3/2 LEGEND 7/6 L2600=20 MHz & L1800=10 MHz Current: qRxLevMin : -120/-122 dBm Proposed qRxLevMin: L2600=-126; L1800=-124 Current: All WCDMA RSCP/EcNo values Current: WCDMA RSCP > -113/-111 dBm (Proposed: WCDMA RSCP > -110 dBm) 2G 3G: qRxLevMin : -115 dBm 4$: qRxLevMinE: -124 dBm 1 L2600 L1800 RSRP < -102/-116 (Proposed: < -126) RSRP > -112/-116 (Proposed: > -118) RSRP : All Levels 6 U2100 F1 & F2 U900 F3 Priority : 3 Priority : 3 (2) qOffset2sn Current: 0 dB qOffset2sn Current: 0 dB (Proposed: 3dB) (Proposed: 0dB) FASTRETLTE (G2L) Old: RSRP > -110 dBm Proposed: RSRP > -116 dBm gsmRelation.qOffset1Sn Current = 7 dB (Proposed: 50 dB) Current: EcNo/RSCP > -12 dB/-102 dBm Proposed: EcNo/RSCP > -14 dB/-106 dBm FASTRET3G (G2U) 3G RSCP > -111 dBm Current: Measure WCDMA @ RSRP < -118/-110 dBm Proposed: RSRP < -124 (L1800) Proposed: RSRP < -126 (L2600) Current: Measure GSM @ RSCP < -116 dB (Proposed: RSCP < -118 dB) 7 RSRP < -114/-120 (Proposed: < -112) Measure L1800: Current: < -118/-110 (Proposed: < -120/-126) X
  • 7.
    Ericsson Internal |2018-02-21 ConnectedMode–TELMAMD L1800MCPCThresholds Inner Search zone Outer Search zone Good Coverage Proposed A1 Thresh = -110 (Current = -112 ) Proposed A2 Inner Search Thresh = -114 (current = -116 ) L1800 MCPC Proposed Outer Search Thresh = -122 (Current = -116 ) Proposed Critical Cov = -131 (Current= -121/-141 ) A5 Threshold 1 (Source Cell): Current: < -111 dBm Proposed: < -114 dBm A5 Threshold 2 (Target Cell): Current: > -109 dBm Proposed: > -115 dBm B2 Threshold 1 (Source Cell): Current: < -115 to -122 dBm Proposed: < -122 dBm B2 Threshold 2 (Target Cell): Current: > -109 to -116 dBm Proposed: > -107 dBm A5 B2 L2600 W2100 L1800 G900 U900
  • 8.
    Ericsson Internal |2018-02-21 ConnectedMode–TELMAMD L2600MCPCThresholds Inner Search zone Outer Search zone Good Coverage Proposed A1 Thresh = -113 (Current = -112 ) Proposed A2 Inner Search Thresh = -117 (current = -116 ) Proposed Outer Search Thresh = -122 (Current = -116 ) Proposed Critical Cov = -131 (Current= -121/-141 ) A5 Threshold 1 (Source Cell): Current: < -111 dBm Proposed: < -117 dBm A5 Threshold 2 (Target Cell): Current: > -109 dBm Proposed: > -110 dBm B2 Threshold 1 (Source Cell): Current: < -115 to -122 dBm Proposed: < -122 dBm B2 Threshold 2 (Target Cell): Current: > -109 to -116 dBm Proposed: > -107 dBm A5 B2 L2600 MCPC L2600 W2100 L1800 G900 U900
  • 9.
    Ericsson Internal |2018-02-21 4G – L2600 Mobility Overview Proposal: LTE Inter-Frequency Load Balancing (Connected Mode) Inter-Freq - Load Balancing 4G – L1800 Current: RSRP > -43 (Proposed: > -116) Current: RSRP < -45 (Proposed: < -118 ) Current: RSRP > -43 (Proposed: >-105 ) LEGEND Current: RSRP < -45 (Proposed: < -45 )
  • 10.
    SAMPLE 3G Mobility& LOAD SHARING proposed STRATEGY
  • 11.
    Ericsson Internal |Airtel Gabon Camping Strategy | 2018-09-27 | Page 11 Possible layer scenarios to be implemented when the full u900 layer is rolled out U2100-F1 GSM U2100-F2 LTE U2100-F1 GSM U2100-F2 LTE U2100-F1 GSM LTE GSM Scenario 1 U2100-F3 U900-F4 U900-F4 U900-F4 U900-F4 Scenario 2 Scenario 3 Scenario 4 U2100-F1
  • 12.
    Ericsson Internal |Airtel Gabon Camping Strategy | 2018-09-27 | Page 12 Scenario 1 = Gsm+u900(1C)+U2100(3C)+L1800(1C)+L2600(1C) U2100 F2 (P3) IF-GSM-PREF U2100 F1 (P3) IF-GSM-PREF U2100 F2 (P3) IF-GSM-PREF U2100 F1 (P3) IF-GSM-PREF IFHO IRAT INTRA- FREQ HO & RE-SELECTION GSM (P1) GSM (P1) U900 F4 (P2) IF-GSM-PREF U900 F4 (P2) IF-GSM-PREF U2100 F3 (P3) IF-GSM-PREF U2100-F3 (P3) IF-GSM-PREF Inter-Freq + GSM Relations F1 → F2+U900 + IRAT (Same site + Neighbour site) F2 → F3+U900 + IRAT (Same site + Neighbour site) F3 → F1+U900 + IRAT (Same site + Neighbour site) U900 → F1+F2 + IRAT (Same site + Neighbour site) IRAT HO IRAT HO L800 (P6) LTE (P7/P7) IRAT HO IRAT HO IRAT IDLE RE-SELECTION RE-SELECTION RE-SELECTION RE-SELECTION RE-SELECTION LTE (P7/P6) CSFB CSFB CSFB to WCDMA Intra-Freq Relations (2-way) F1 → F1 (Same site + Neighbour site) F2 → F2 (Same site + Neighbour site) F3 → F3 (Same site + Neighbour site) U900 → U900 (Same site + Neighbour site)
  • 13.
    Ashitei Ashiboe-Mensah |2019-01-24 | Movicel Angola Reselection, Mobility & Traffic Steering Audit | | Page 13 Scenario 2 = GSM+u900(1C)+U2100(2C)+L1800(1C)+L2600(1C) U2100 F2 (P3) IF-GSM-PREF U2100 F1 (P3) IF-GSM-PREF U2100 F2 (P3) IF-GSM-PREF U2100 F1 (P3) IF-GSM-PREF IFHO IRAT INTRA- FREQ HO & RE-SELECTION GSM (P1) GSM (P1) U900 F3 (P2) IF-GSM-PREF U900 F3 (P2) IF-GSM-PREF Inter-Freq & GSM Relations F1 → F2+U900 + IRAT (Same site + Neighbour site) F2 → F1+U900 + IRAT (Same site + Neighbour site) U900 → F1+F2 + IRAT (Same site + Neighbour site) IRAT HO IRAT HO L800 (P6) LTE (P7/P6) IRAT HO IRAT HO IRAT IDLE RE-SELECTION RE-SELECTION RE-SELECTION RE-SELECTION RE-SELECTION LTE (P7/P6) CSFB CSFB CSFB to WCDMA Intra-Freq Relations (2-way) F1 → F1 (Same site + Neighbour site) F2 → F2 (Same site + Neighbour site) U900 → U900 (Same site + Neighbour site)
  • 14.
    Ericsson Internal |Airtel Gabon Camping Strategy | 2018-09-27 | Page 14 Scenario 3 = GSM+u900(1C)+U2100(1C)+L1800(1C)+L2600(1C) U2100 F1 (P3) IF-GSM-PREF U2100 F1 (P3) IF-GSM-PREF IFHO IRAT INTRA- FREQ HO & RE-SELECTION GSM (P1) GSM (P1) U900 F2 (P2) IF-GSM-PREF U900 F2 (P2) IF-GSM-PREF Inter-Freq + GSM Relations F1 → U900 + IRAT (Same site + Neighbour site) U900 → F1 + IRAT (Same site + Neighbour site) IRAT HO IRAT HO L800 (P6) LTE (P7/P6) IRAT HO IRAT HO IRAT IDLE RE-SELECTION RE-SELECTION RE-SELECTION RE-SELECTION RE-SELECTION LTE (P7/P6) CSFB CSFB CSFB to WCDMA Intra-Freq Relations (2-way) F1 → F1 (Same site + Neighbour site) U900 → U900 (Same site + Neighbour site)
  • 15.
    Ericsson Internal |Airtel Gabon Camping Strategy | 2018-09-27 | Page 15 Scenario 4 = gsm+u900(1C) + U2100(1C) U2100 F1 (P3) IF-GSM-PREF U2100 F1 (P3) IF-GSM-PREF IFHO IRAT INTRA- FREQ HO & RE-SELECTION GSM (P1) GSM (P1) U900 F2 (P2) IF-GSM-PREF U900 F2 (P2) IF-GSM-PREF Inter-Freq + GSM Relations F1 → U900 + IRAT (Same site + Neighbour site) U900 → F1 + IRAT (Same site + Neighbour site) IRAT HO IRAT HO IRAT IDLE RE-SELECTION RE-SELECTION RE-SELECTION CSFB to WCDMA Intra-Freq Relations (2-way) F1 → F1 (Same site + Neighbour site) U900 → U900 (Same site + Neighbour site)
  • 16.
    Ashitei Ashiboe-Mensah |2019-01-24 | Movicel Angola Reselection, Mobility & Traffic Steering Audit | | Page 16 Sib11 congestion – precautions to take SIB11 - SIB12 Indicator - FACH Measurement Occasion Information - Measurement Control System Information - Use of HCS - Cell Selection and Reselection Criteria - Intra-frequency measurement system information - Intra-frequency cell info list … - Inter-frequency measurement system information - InterFrequency Cell Info List … - Inter-RAT measurement system information -Inter Rat Cell Info List … ❑ Example of safe number to avoid SIB11 issues: ➢ max 22 INTRA, max 20 INTER, max 16 GSM ➢ Total of 58 max neighbours
  • 17.
    Ashitei Ashiboe-Mensah |2019-01-24 | Movicel Angola Reselection, Mobility & Traffic Steering Audit | | Page 17 Compressed mode strategy Downlink Code Power based Compressed Mode (W15B onwards) Background › Operator with growing/heavy HSPA traffic want to avoid unnecessary compressed mode and do not want to move connections to GSM if not needed Description › Introduces a new trigger for compressed mode, Downlink Radio Link Code Power – Replaces/ reduces the need for Ec/N0 as trigger for Compressed Mode Benefits › Reducing unnecessary triggering of Compressed Mode gives: – More WCDMA coverage – Reduced system load – Less IRAT Handovers RBS Node B GSM Coverage WCDMA Coverage Area where no compressed mode is triggered when Ec/No based trigger is replaced by Downlink Code Power Based CM
  • 18.
    Ashitei Ashiboe-Mensah |2019-01-24 | Movicel Angola Reselection, Mobility & Traffic Steering Audit | | Page 18 Feature Recommendations ➢ Activate Feature DCH/EUL Load Balancing (UL congested cells won’t be target of LS) ➢ Disable Feature DCH Load Sharing (Prevent Voice calls from being targeted by IFLS) ➢ Activate Feature FAJ 121 1880 HSDPA IFLS Capability and Priority Handling Proposed 3G load sharing strategy Overall Proposed Strategy ➢ Activate HS-IFLS (HspaLoadSharing) on all 3 WCDMA Layers ➢ Define Bi-Directional Co-Sector Coverage Relations in all WCDMA Layers ➢ Control load sharing between layers by tuning HS-IFLS parameters ▪ iflsHyst → (Lower the Hysteresis load criterion between the more loaded & the less loaded cells) ▪ hsIflsMarginUsers → (make U900 look more loaded than U2100 in reality before even starting HS-IFLS Evaluation) ▪ hsIflsThreshUsers → (Lower the HS-IFLS algorithm trigger threshold so as to increase the frequency of off-loading from U900) ▪ hsIflsSpeechMultiRabTrigg → (set to 0, so as to prevent Speech-inclusive MultiRabs from being targeted by HS-IFLS, thereby prevent possible dropped voice calls) ▪ iflsCpichEcnoThresh → Allow IFLS-triggered reconfigurations from FACH/URA to HSDPA only in good EcNo conditions ▪ iflsMode → Do not allow Up-switch Attempts to serve as HS-IFLS trigger on U900 cells towards U2100 cells (due to absence of pathloss checks during Up-switch attempts) ▪ pathlossThreshold → (make the pathloss criteria more strict for U900 than for U2100, thereby reduce probability of offloading traffic to U900)
  • 19.
    Ashitei Ashiboe-Mensah |2019-01-24 | Movicel Angola Reselection, Mobility & Traffic Steering Audit | | Page 19 U2100-F2 U2100-F1 HSIFLS HS IFLS U900-F3 F1 → F2 + U900 F2 → F1 + U900 U900 → F1 + F2 Source Target F1 F2 F1 U900 U900 F1 U900 F2 F2 F1 F2 U900 HSDPA Interfrequency Load Sharing (2/3) (HSdpa-IFLS) LEGEND ➢Define Bi-Directional Co-Sector Coverage Relations in all 3 Layers
  • 20.
    Ericsson Internal |Airtel Gabon Camping Strategy | 2018-09-27 | Page 20 U2100-F2 U2100-F1 HSIFLS HS IFLS U900-F4 U2100-F3 F1 → F2 + F3 + U900 F2 → F1 + F3 + U900 F3 → F1 + F2 + U900 U900 → F1 + F2 + F3 Source Target F1 F2 F1 F3 F1 U900 U900 F1 U900 F2 U900 F3 F2 F1 F2 F3 F2 U900 F3 F2 F3 F1 F3 U900 HSDPA Interfrequency Load Sharing (3/3) (HSdpa-IFLS) LEGEND ➢Define Bi-Directional Co-Sector Coverage Relations in all 4 Layers
  • 21.
    Ashitei Ashiboe-Mensah |2019-01-24 | Movicel Angola Reselection, Mobility & Traffic Steering Audit | | Page 21 HSDPA Interfrequency Load Sharing (1/3) (HSdpa-IFLS) MO Parameter Proposed setting on RNC Proposed setting On U2100 cells Propsoed setting On U900 cells Handover iflsHyst 10 (can be set = 5) UtranCell hsIflsMarginUsers 0 50 (make U900 look 50% more loaded than in reality before starting IFLS Evaluation) UtranCell hsIflsThreshUsers 5 (can be set higher) 5 (can be set lower) UtranCell hsIflsSpeechMultiRabTrigg 0 (Currently 326 cells = 1) 0 (Currently 56 cells = 1) UtranCell iflsCpichEcnoThresh -14 (can be tuned further) -14 (can be tuned further) UtranCell iflsMode 2 (RAB_EST_AND_UPSWITCH_ATT) 0 (RAB_EST) (for more aggressive IFLS, set to 2) UtranCell pathlossThreshold 130 110 (can be tuned further) Eul pathlossThresholdEulTti2 135 135 › UE movement at Load Sharing is performed through Blind (no measurements) handover, and hence there is a chance for failure › If Blind HO fails, call isn’t dropped, it returns to source call => but this introduces delays in establishment that would impact user experience, specially for typical bursty behaviours
  • 22.
    Ashitei Ashiboe-Mensah |2019-01-24 | Movicel Angola Reselection, Mobility & Traffic Steering Audit | | Page 22 › U2100 layer is Multi-Carrier Capable. To take full advantage of the MC capabilities, this feature allows one to prioritize those U2100 carriers for the UEs that support MC, increasing overall user experience and throughput › But more importantly, it also adds an important improvement: – hsIflsSpeechMultiRabTrigg switch takes effect when the feature is activated – hsIflsSpeechMultiRabTrigg recommended to be set = OFF, else there is a risk of CS drops due to blind Handover › If a user has setup a speech call in a cell, and then tries to setup a HS connection to speech+HS, the cell parameter hsIflsSpeechMultiRabTrigg is checked to decide if HSDPA IFLS must trigger/evaluate or not. › Recommended to license and activate feature, and set hsIflsSpeechMultiRabTrigg = OFF › RncFeature=HsdpaIflsCapAndPrioHandling (must be ENABLED) HSDPA IFLS Capability and Priority Handling (W12b onwards)