Calculator for LTE Mobility Events

Introduction and GuidelinesIn LTE systems Mobility is complicated since there are lots of scenarios including lots of parameters, formulas, calculations and thesholds.The purpose for this KO is to simplify the calculation for the Mobilty events (Idle Mode and Connected Mode) based on the Paramters thresholds you want to select for your network.The Mobility "Parameter sheet" includes many parameters controlling Mobility thresholds ifluencing the reselection, session continuity and HO decisions (Intra LTE. Inter Frequency, and IRAT).You can make use the available paramters values as Baseline. You can also change the parameters based on your own network's strategy.Only the green fileds can be changed.

The "Mobility Events" sheet shows the formula's with the parameters inputed in the "Mobilty Parameter" sheet and the calculated thresholds that govern the mobiliy events. Also description for each Event is included.When you change the thresholds or parameters in the "Mobility Parameter" sheet, they will be directly adjusted in the formulas and calculations in :mobility Event" sheet.

Additionally, there are TAB's for different Events showing the thresholds in graphs for better illustration. The threshold values are also related to the parameter values in the "Mobility Parameters" sheet and change automatically based on your input.This is very helpful when you need to make new Mobility strategies; you can select different parameter settings and graphically see the thresholds that influence mobility events. This is important to set the proper mobility parameters, espcially there are many dependencies among the event thresholds.The Events that are illustrated Graphycally are:

This KO illustrates the mobility events in LTE showing the parameters, thresholds, formulas and calculations controlling the mobility Events. The graphs with the thresholds triggering the mobility events will be helpful also to visualize the effect of the parameters' settings and dependencies.Using this KO will be mostly beneficial to facilitate calculation of mobility event thresholds, especially when setting Mobility strategies for your netwokrs.

This KO is based completely on Alex documents related to Idle Mode, Session Continuity, HO… features.If there is any question, or you find any discrepency, or if you have any idea to add or modify please let me know @ [email protected]

Mobility Parameters sheet

Mobility Events Sheet

Idle Mode Cell-reselection (LTE->LTE)Idle Mode cell-reselection (LTE->UMTS)Connected Mode: Intra frequency HO (LTE->LTE)A3 EventConnected Mode: IRAT Session ContinuityA2 Event3G Idle Mode: Cell-reselection (UMTS->LTE)A5 EventB2 Event

In LTE systems Mobility is complicated since there are lots of scenarios including lots of parameters, formulas, calculations and thesholds.The purpose for this KO is to simplify the calculation for the Mobilty events (Idle Mode and Connected Mode) based on the Paramters thresholds you want to select for your network.The Mobility "Parameter sheet" includes many parameters controlling Mobility thresholds ifluencing the reselection, session continuity and HO decisions (Intra LTE. Inter Frequency, and IRAT).You can make use the available paramters values as Baseline. You can also change the parameters based on your own network's strategy.Only the green fileds can be changed.

The "Mobility Events" sheet shows the formula's with the parameters inputed in the "Mobilty Parameter" sheet and the calculated thresholds that govern the mobiliy events. Also description for each Event is included.When you change the thresholds or parameters in the "Mobility Parameter" sheet, they will be directly adjusted in the formulas and calculations in :mobility Event" sheet.

The threshold values are also related to the parameter values in the "Mobility Parameters" sheet and change automatically based on your input.This is very helpful when you need to make new Mobility strategies; you can select different parameter settings and graphically see the thresholds that influence mobility events.

This KO illustrates the mobility events in LTE showing the parameters, thresholds, formulas and calculations controlling the mobility Events. The graphs with the thresholds triggering the mobility events will be helpful also to visualize the effect of the parameters' settings and dependencies.Using this KO will be mostly beneficial to facilitate calculation of mobility event thresholds, especially when setting Mobility strategies for your netwokrs.

If there is any question, or you find any discrepency, or if you have any idea to add or modify please let me know @ [email protected]

Function Parameter Parameter ValueIdle qRxLevMin -120Idle sIntraSearch 62Idle qHyst 4Idle qOffsetFreq 0Idle qRxLevMin (for LTE Cell) -120Idle qRxLevMin (for UTRAN Freq) -115Idle threshServingLow 14Idle threshXLow 4Idle sNonIntraSearch 14Dedicated sMeasure 0HO A3Offset 30HO hysteresisA3 10Dedicated sMeasure 0A2 a2ThresholdRsrpPrim -108A2 a2ThresholdRsrqSec -195A2 hysteresisA2Prim 203G absPrioCellRes.sPrioritySearch1 443G qRxLevMin (on 3G cell) -1153G qRxLevMin (on 3G cell for LTE Eutran relation) -1203G Threshhigh 18A1 a1ThresholdRsrpPrim -136A1 a1ThresholdRsrqPrim -195A1 hysteresisA1Prim 10A1 timeToTriggerA1Prim 640A1 a1ThresholdRsrpSec -136A1 a1ThresholdRsrqSec -195A1 hysteresisA1Sec 10A1 timeToTriggerA1Sec 640A1&A2 triggerQuantityA2Prim 0 (RSRP)A1&A2 triggerQuantityA2Sec 1 (RSRQ)A5/B2 ueMeasurementsActive 0Priority connectedModeMobilityPrio 7Priority connectedModeMobilityPrio 5Priority connectedModeMobilityPrio 1Priority 0A5&B2 a5B2MobilityTimer 0A2 triggerQuantityA2Prim 0 (RSRP)A2 triggerQuantityA2Sec 1 (RSRQ)A2 hysteresisA2Sec 10A2 a2ThresholdRsrqPrim -195A2 a2ThresholdRsrpSec -140B2 b2Threshold1Rsrp -140B2 b2Threshold1Rsrq -195B2 b2Threshold2RscpUtra -115B2 b2Threshold2EcNoUtra -240B2 b2Threshold2Geran -110B2 hysteresisB2 10B2 timeToTriggerB2 640B2 triggerQuantityB2 0 (RSRP)Measurement on 3G measQuantityUtraFDD 0 (RSCP)idle qOffsetFreq 0Number of Measurement maxMeasUtraFdd 5Number of Measurement maxMeasGeran 5Number of Measurement maxMeasInterFreqEUtra 7A5 a5Threshold1Rsrp -140A5 a5Threshold2Rsrp -136A5 a5Threshold1Rsrq -195A5 a5Threshold2Rsrq -195A5 hysteresisA5 10

voicePrio

A5 timeToTriggerA5 640A5 triggerQuantityA5 0 (RSRP)A3 cellIndividualOffsetEUtran 0A2 timeToTriggerA2Sec 640A2 timeToTriggerA2Prim 480Idle tReselectionEutra 2Idle tReselectionUtra 1Idle tReselectionGeran 2A3 triggerQuantityA3 0 (RSRP)A3 timeToTriggerA3 403G treselection (on 3G cell for LTE Eutran relation) 1

Back To: Mobility EventsBack to: Introduction

MO ClassEUtranCellFDDsystemInformationBlock3systemInformationBlock3EUtranFreqRelationEUtranFreqRelationUtranFreqRelation/GeranFreqGroupRelationsystemInformationBlock3UtranFreqRelationsystemInformationBlock3UeMeasControlReportConfigEUtraBestCellReportConfigEUtraBestCellUeMeasControla2ThresholdRsrpPrima2ThresholdRsrqSecReportConfigEUtraBadCovPrimUtrancellUtrancellEutranFreqrelationEutranFreqrelationReportConfigA1PrimReportConfigA1PrimReportConfigA1PrimReportConfigA1PrimReportConfigA1SecReportConfigA1SecReportConfigA1SecReportConfigA1SecReportConfigEUtraBadCovPrimReportConfigEUtraBadCovSecUeMeasControlEutranFreqRelationUtranFreqRelationGeranFreqGroupRelationEutranFreqRelation/UtranFreqRelationUeMeasControlReportConfigEUtraBadCovPrimReportConfigEUtraBadCovSecReportConfigEUtraBadCovSecReportConfigEUtraBadCovPrimReportConfigEUtraBadCovSecReportConfigB2Utra/ReportConfigB2GeranReportConfigB2Utra/ReportConfigB2GeranReportConfigB2UtraReportConfigB2UtraReportConfigB2GeranReportConfigB2Utra/ReportConfigB2GeranReportConfigB2Utra/ReportConfigB2GeranReportConfigB2Utra/ReportConfigB2GeranUeMeasControlEutranFreqRelation/UtranFreqRelation/GeranFreqGroupRelationUeMeasControlUeMeasControlUeMeasControlReportConfigA5ReportConfigA5ReportConfigA5ReportConfigA5ReportConfigA5

ReportConfigA5ReportConfigA5EUtranCellRelationReportConfigEUtraBadCovSecReportConfigEUtraBadCovPrimEUtranFreqRelationsystemInformationBlock6systemInformationBlock7ReportConfigEUtraBestCellReportConfigEUtraBestCellUtrancell

DefinitionLTE Intra Frequency Cell Reselection ParamtersLTE Intra Frequency Cell Reselection ParamtersLTE Intra Frequency Cell Reselection ParamtersLTE Intra Frequency Cell Reselection ParamtersLTE Cell Reselection to 3G ParametersLTE Cell Reselection to 3G ParametersLTE Cell Reselection to 3G ParametersLTE Cell Reselection to 3G ParametersLTE Cell Reselection to 3G ParametersLTE IntraFrequency HO ParamtersLTE IntraFrequency HO ParamtersLTE IntraFrequency HO ParamtersCoverage Triggered session Continuity to 3G parametersCoverage Triggered session Continuity to 3G parametersCoverage Triggered session Continuity to 3G parametersCoverage Triggered session Continuity to 3G parameters3G setting for measurement intesification on absolute priority Frequency3G level of RSCP coverage3G setting for measurement on EUTRAN relation3G setting for measurment on higher priortity FreqA1 ThresholdA1 ThresholdA1 HystererisTime to trigger for A1A1 ThresholdA1 ThresholdA1 HystererisTime to trigger for A1Controls Trigger Quantity for A1 and A2 Primary eventsControls Trigger Quantity for A1 and A2 Secondary eventsActivates or deactivates A5/B2 measurements on EUTRAN inter-frequencies, GERAN, UTRA and CDMA2000 frequencies for mobility purposes.Priority for EUTRAN FREQPriority for UTRAN FREQPriority for GERANFREQPriority for VoiceThe length of time the eNodeB waits for reports from A5/B2 measurements configured in the UE for mobility reasons.Controls Trigger Quantity for A1 and A2 Primary eventsControls Trigger Quantity for A1 and A2 Primary eventsCoverage Triggered session Continuity to 3G parametersCoverage Triggered session Continuity to 3G parametersCoverage Triggered session Continuity to 3G parameters

Ec/No (ratio of energy per modulation bit-to-noise spectral density) threshold value for the Event B2 measurement. Used only when measQuantityUtraFDD is set to ECNO.QCI dependent offset for the absolute threshold b2Threshold2Geran. If the value of the offset is 0, then the threshold corresponding to this QCI profile will be the same as the "base" value in the MO class, namely b2Threshold2Geran.Hysteresis value for the Event B2 measurementTime by which the Event B2 criterion must be fulfilled before the first measurement report is sentQuantity that triggers the Event B2 measurementMeasurement quantity used for all types of UTRA FDD measurements.Indicates a frequency-specific offset to apply when evaluating triggering conditions for measurement reporting

The number of measurements that can be concurrently performed by the UE on E-UTRA frequencies other than the serving cell frequency.

Hysteresis value for the Event A5 measurement

RSRP threshold value (for the serving cell) for the Event B2 measurementRSRQ threshold value (for the serving cell) for the Event B2 measurementRSCP threshold value for the Event B2 measurement.Used only when measQuantityUtraFDD is set to RSCP.

Number of measurements that can be concurrently performed by the UE on UTRA FDD measurement objects. Note that if the feature Automated Neighbor Relations (ANR) is enabled, one ANR measurement on a UTRA FDD measurement object might be configured for a UE. Therefore, the recommended minimum value when ANR is enabled is 2, to be able to accommodate at least one Event B2 Target Good Enough EUTRA measurement for every UE.Number of measurements that can be concurrently performed by the UE onGERAn measurement objects. Note that if the feature Automated Neighbor Relations (ANR) is enabled, one ANR measurement on a UTRA FDD measurement object might be configured for a UE. Therefore, the recommended minimum value when ANR is enabled is 2, to be able to accommodate at least one Event B2 Target Good Enough EUTRA measurement for every UE.

RSRP threshold value (for the serving cell) for the Event A5 measurementRSRP threshold2 value (for the target cell) for the Event A5 measurementRSRQ threshold value (for the serving cell) for the Event A5 measurementRSRQ threshold2 value (for the target cell) for the Event A5 measurement

Time by which the Event A5 criterion must be fulfilled before the first measurement report is sentQuantity that triggers the Event A5 measurementOffset value for the neighbor cell. Used when UE is in connected mode. This attribute is modified by SON function HoOscCtrlRelTime to trigger for A2Time to trigger for A2Time for reselection to EUTRANTime for reselection to UTRANTime for reselection to GERANQuantity that triggers the Event A3 measurementTime to trigger for A3Reselection time for Cell reselection from 3G to LTE

Ec/No (ratio of energy per modulation bit-to-noise spectral density) threshold value for the Event B2 measurement. Used only when measQuantityUtraFDD is set to ECNO.QCI dependent offset for the absolute threshold b2Threshold2Geran. If the value of the offset is 0, then the threshold corresponding to this QCI profile will be the same as the "base" value in the MO class, namely b2Threshold2Geran.

on UTRA FDD measurement objects. Note that if the feature Automated Neighbor Relations (ANR) is enabled, one ANR measurement on a UTRA FDD measurement object might be configured for a UE. Therefore, the recommended minimum value when ANR is enabled is 2, to be able to accommodate at least one Event B2 Target Good Enough EUTRA measurement for every UE.UE onGERAn measurement objects. Note that if the feature Automated Neighbor Relations (ANR) is enabled, one ANR measurement on a UTRA FDD measurement object might be configured for a UE. Therefore, the recommended minimum value when ANR is enabled is 2, to be able to accommodate at least one Event B2 Target Good Enough EUTRA measurement for every UE.



Scenario Thresholds

Intra cell Reselection Start: RSRP (meas) < -58

R(serving) = RSRP(meas) + 4

R(neighbor) = RSRP(meas) - 0

IRAT Reselection measurement Starts: RSRP (meas) < -106

A. RSRP(meas) < -106

and B. RSRP(3G) > -111

Connected Initiated UE measurement (LTE->LTE) Measurement starts when RSRP(meas) < 0

M(n) > M(s) + 4

M(n) < M(s) + 2

Connected Initiated UE measurement (SC) Measurement starts when RSRP(meas) < 0

A2 event starts when RSRP(meas) (or RSRQ) < -110 (or -197)

A2 event ends when RSRP(meas) (or RSRQ) < -106 (or -193)

UE intensify measuring on LTE if RSCP(3G) < -71

UE Selects LTE Cell if RSRP(LTE) > -102

A1 Event A1 event starts when RSRP(meas) (or RSRQ) > -135 (or -194)

A5 Event happens when Both conditions are fulfilled:

RSRP(meas) (or RSRQ) < -141 (or -196)

RSRP (Target) (or RSRQ) > -135( or -194)

A5 stopps when one of the conditions are fulfilled:

RSRP(meas) (or RSRQ) > -139 (or -194)

RSRP (Target) (or RSRQ) < -137( or -196)

B2 Event happens when Both conditions are fulfilled:

RSRP(meas) (or RSRQ) < -141 or (-196)

Either: RSCP (or EcNO) > -114( or -23)

OR: GERAN > -109

B2 Event is stopped when one of the conditions is fulfilled:

RSRP(meas) (or RSRQ) > -139 or (-194)

Either: RSCP (or EcNO) < -116( or -25)

OR: GERAN < -111

Idle Mode Cell-reselection (LTE->LTE)

Idle Mode cell-reselection (LTE->UMTS)

Connected Mode: Intra frequency HO (LTE->LTE)A3 Event

Connected Mode: IRAT Session ContinuityA2 Event

3G Idle Mode: Cell-reselection (UMTS->LTE)

A5 Event

B2 Event

Back To: Mobility Parameters

Back to: Introduction

Formula and Parameters Value

Intra cell Reselection Start: RSRP (meas) < "-120"+"62"

R(serving) = RSRP(meas) + "4"

R(neighbor) = RSRP(meas) - "0"

IRAT Reselection Starts: RSRP (meas) < "-120"+"14"

A. RSRP(meas) < "-120+"14"

and B. RSRP(3G) > "-115"+"4"

Measurement starts when RSRP(meas) < "0"

M(n) > M(s) + "3"+"1"-"0"

M(n) < M(s) + "3"-"1"-"0"

Measurement starts when RSRP(meas) < "0"

A2 event starts when RSRP(meas) (or RSRQ) < "-108"-"2" (or "-195-"2")

A2 event starts when RSRP(meas) (or RSRQ) < "-108"+"2" (or "-195+"2")

UE intensify measuring on LTE if RSCP(3G) < "44" + "-115"

UE Selects LTE Cell if RSRP(LTE) > "18" + -120"

A1 event starts when RSRP(meas) (or RSRQ) > "-136" + "1" or ("-195" + "1")


RSRP(meas) (or RSRQ) < "-140" (or "-195") - "1"

RSRP (Target) (or RSRQ) > "-136"( or "-195") - "0" + "1"

A5 stopps when one of the conditions are fulfilled:

RSRP(meas) (or RSRQ) > "-140" (or "-195") + "1"

RSRP (Target) (or RSRQ) < "-136"( or "-195") - "0" - "1"


RSRP(meas) (or RSRQ) < "-140" (or "-195") - "1"

Either: RSCP (or EcNO) > "-115"( or "-24") - "0" + "1"

OR: GERAN > "-110" - "0" + "1"


RSRP(meas) (or RSRQ) > "-140" (or "-195") + "1"

Either: RSCP (or EcNO) < "-115"( or "-24") - "0" - "1"

OR: GERAN < "-110" - "0" - "1"

Formula & Parameters

Intra cell Reselection Start: RSRP (meas) < "qRxLevMin"+"sIntraSearch"

R(serving) = RSRP(meas) + "qHyst"

R(neighbor) = RSRP(meas) - "qOffsetFreq"

IRAT Reselection Starts: RSRP (meas) < "qRxLevMin"+"sNonIntraSearch"

A. RSRP(meas) < "qRxLevMin+"threshServingLow"

and B. RSRP(3G) > "qRxLevMin (for UTRAN Freq)"+"threshXLow"

Measurement starts when RSRP(meas) < "sMeasure"

M(n) > M(s) + "A3Offset"+"hysteresisA3"-"cellIndividualOffsetEUtran"

M(n) < M(s) + "A3Offset"-"hysteresisA3"-"cellIndividualOffsetEUtran"

Measurement starts when RSRP(meas) < "sMeasure"

A2 event starts when RSRP(meas) (or RSRQ) < "a2ThresholdRsrpPrim"-"hysteresisA2Prim" (or "a2ThresholdRsrqPrim-"hysteresisA2Prim")

A2 event starts when RSRP(meas) (or RSRQ) < "a2ThresholdRsrpPrim"+"hysteresisA2Prim" (or "a2ThresholdRsrqPrim+"hysteresisA2Prim")

UE intensify measuring on LTE if RSCP(3G) < "absPrioCellRes.sPrioritySearch1" + "qRxLevMin (on 3G cell)"

UE Selects LTE Cell if RSRP(LTE) > "Threshhigh" + qRxLevMin (on 3G cell for LTE Eutran relation)"

A1 event starts when RSRP(meas) (or RSRQ) > "a1ThresholdRsrpPrim" + "hysteresisA1Prim" or ("a1ThresholdRsrqPrim" + "hysteresisA1Prim")


RSRP(meas) (or RSRQ) < "a5Threshold1Rsrp" (or "a5Threshold1Rsrq") - "hysteresisA5"

RSRP (Target) (or RSRQ) > "a5Threshold2Rsrp"( or "a5Threshold1Rsrq") - "qOffsetFreq" + "hysteresisA5"

A5 stops when one of the conditions are fulfilled:

RSRP(meas) (or RSRQ) > "a5Threshold1Rsrp" (or "a5Threshold1Rsrq") + "hysteresisA5"

RSRP (Target) (or RSRQ) < "a5Threshold2Rsrp"( or "a5Threshold1Rsrq") - "qOffsetFreq" - "hysteresisA5"


RSRP(meas) (or RSRQ) < "b2Threshold1Rsrp" (or "b2Threshold1Rsrq") - "hysteresisB2"

Either: RSCP (or EcNO) > "b2Threshold2RscpUtra"( or "b2Threshold2EcNoUtra") - "qOffsetFreq" + "hysteresisB2"

OR: GERAN > "b2Threshold2Geran" - "qOffsetFreq" + "hysteresisB2"


RSRP(meas) (or RSRQ) > "b2Threshold1Rsrp" (or "b2Threshold1Rsrq") + "hysteresisB2"

Either: RSCP (or EcNO) < "b2Threshold2RscpUtra"( or "b2Threshold2EcNoUtra") - "qOffsetFreq" - "hysteresisB2"

OR: GERAN < "b2Threshold2Geran" - "qOffsetFreq" - "hysteresisB2"

IntraFreq Cell Reselection will start when sRxLev <= sIntraSearch. Ranking for cells will be based on:

R(serving) = Meas RSRP + qHyst

R(neighbor) = Meas RSRP -qOffset.

Measurements start when RSRP is less than sMeasure

A3 event happens when M(n)+ CellOffset -HystA3 > M(s) + A3Offset

A3 event stops when M(n)+ CellOffset +HystA3 < M(s) + A3Offset

Measurements start when RSRP is less than sMeasure

A1 Event happens when M(s) is better than a threshold

Description

IRAT Cell Reselection will start when sRxLev <= sNonIntraSearch. The cell reselection will happen when Srxlev < threshServingLow and the Target 3G cell Srxlev > threshXLow

Coverage triggered session continuity will start based on RSRP (Primary measurement) and RSRQ (secondary Measurement) when it fulfills A2 Event. The UE will release LTE with redirect message, thus it goes to idle mode and selects a suitable 3G cell.

Set LTE cell priority higher than wcdma priority. Measurement detection on LTE cell higher priority is done every 60s. UE intensify measuring on LTE if RSCP(3G) - qRxLevMin(3G) <absPrioCellRes.sPrioritySearch1. UE Selects LTE Cell if RSRP(LTE) -qRxLevMin (EutranFreqRelation)>Threshhigh for treselection time

For A5 event to be fulfiled 2 conditions shall be reached. 1-Serving cell is worse than a threshold2-The target cell is better than another threshold.

To exit A5 event one of these 2 conditions shall be reached. 1-Serving cell is worse than a threshold2-The target cell is better than another threshold.

For B2 event to be fulfiled 2 conditions shall be reached. 1-Serving cell is worse than a threshold2-The target cell is better than another threshold.In the formulas, For Condition2, I have added 3G and 2G, but only one of them will be applicable for B2 event

To exit B2 event one of these 2 conditions shall be reached. 1-Serving cell is worse than a threshold2-The target cell is better than another threshold.In the formulas, For Condition2, I have added 3G and 2G, but only one of them will be applicable for B2 event

Idle Mode Cell-reselection (LTE->LTE)

Intra cell Reselection Start: RSRP (meas) < -58

M(n) > M(s) + 4

Note: The actual intra LTE cell reselection is based on ranking. Neighbor cells are reduced by qOffsetFreq = -0 and Serving cell is increased by qHyst = 4 and the measured cells are ranked.Cell Reselction towards the best cell will happen. The above is just an illustration to show the difference between in RSRP between the serving and the neighbors sites for a successful cell reselection.

Back To: Mobility ParametersBack To: Mobility EventsBack to: Introduction

qHyst = 4 qOffsetFreq = -0

tReselectionEutra = 2

Cell Reselection

Note: The actual intra LTE cell reselection is based on ranking. Neighbor cells are reduced by qOffsetFreq = -0 and Serving cell is increased by qHyst = 4 and the measured cells are ranked.Cell Reselction towards the best cell will happen. The above is just an illustration to show the difference between in RSRP between the serving and the neighbors sites for a successful cell reselection.

M (n)

M (S)

Idle Mode cell-reselection (LTE->UMTS)

IRAT Reselection measurement Starts: RSRP (meas) < -106

sNonIntraSearch = 14

Condition1 for IRAT reselection: A. RSRP(meas) < -106

qRxLevMin = -120

Condition1 for IRAT reselection: and B. RSRP(3G) > -111

qRxLevMin (for UTRAN Freq) = -115

Note: This illustration is considering the priority for the 3G system with lower priority than LTE thus we are using "Low" threshold values.


sNonIntraSearch = 14

Condition 1

threshServingLow = 14

Cell Reselection to 3G

Condition 2

threshXLow = 4 tReselectionUtra = 1

Note: This illustration is considering the priority for the 3G system with lower priority than LTE thus we are using "Low" threshold values.

M (S)

M (n)

Idle Mode cell-reselection (UMTS->LTE)

UE intensify measuring on LTE if RSCP(3G) < -71

qRxLevMin (on 3G cell) = -115

UE Selects LTE Cell if RSRP(LTE) > -102

qRxLevMin (on 3G cell for LTE Eutran relation) = -120

Note: This illustration is considering the priority for the LTE system with higher priority than 3G thus we are using "High" threshold values.


Condition 1

absPrioCellRes.sPrioritySearch1 = 44

Cell Reselection to LTE

Condition 2

Threshhigh = 18 treselection (on 3G cell for LTE Eutran relation) = 1

Note: This illustration is considering the priority for the LTE system with higher priority than 3G thus we are using "High" threshold values.

M (S)

M (n)

treselection (on 3G cell for LTE Eutran relation) = 1

A2 EVENT RSRP (or RSRQ) for Serving Cell depending on Parameter: triggerQuantityA2Prim = 0 (RSRP)

sMeasure (Triggers only in RSRP)= 0


a2ThresholdRsrpPrim (or a2ThresholdRsrqPrim) = -108 (or -195)



RSRP (or RSRQ) for Serving Cell depending on Parameter: triggerQuantityA2Prim = 0 (RSRP)

hysteresisA2Prim = 2

timeToTriggerA2Prim = 480

A2 Event starts


A2 Event stops

A3 EVENT RSRP (or RSRQ) for Serving Cell depending on Parameter: triggerQuantityA3 = 0 (RSRP)


M(n) > M(s) + 4

Note: in the illustration CellindvidualOffset is considered zero though it is included in the formula including M(n)


RSRP (or RSRQ) for Serving Cell depending on Parameter: triggerQuantityA3 = 0 (RSRP)

hysteresisA3 = 1

A3Offset = 3

hysteresisA3 = -1

timeToTriggerA3 = 40

A3 Event Starts

Note: in the illustration CellindvidualOffset is considered zero though it is included in the formula including M(n)

M (S)A3 Event Stops

M (n) M(n) < M(s) + 2

A5 EVENT RSRP (or RSRQ) for Serving Cell depending on Parameter: triggerQuantityA2Prim = 0 (RSRP) and triggerQuantityA5 = 0 (RSRP)





A5 Condition 1 starts: RSRP (Target) (or RSRQ) > -135( or -194)a5Threshold2Rsrp (or a5Threshold2Rsrq) = -136 (or -195)

A5 Condition 1 ends: RSRP (Target) (or RSRQ) < -137( or -196)

A5 Condition 2 ends: RSRP(meas) (or RSRQ) > -139 (or -194)a5Threshold1Rsrp (or a5Threshold1Rsrq) = -140 (or -195)

A5 Condition 2 starts: RSRP(meas) (or RSRQ) < -141 (or -196)

Note: A1 event starts when RSRP(meas) (or RSRQ) > -135 (or -194). When A1 Event is triggered UE will stop searching for A5/B2/A3 Target.Note: if UE enters A2 event, the Timer " a5B2MobilityTimer = 0" will start. If it expires before the finding good target, and no QCI1 exists, release with redirect will take place


RSRP (or RSRQ) for Serving Cell depending on Parameter: triggerQuantityA2Prim = 0 (RSRP) and triggerQuantityA5 = 0 (RSRP)

A2 Event starts



hysteresisA5 = 1

hysteresisA5 = 1


RSRP (or RSRQ) for Serving Cell depending on Parameter: triggerQuantityA2Prim = 0 (RSRP) and triggerQuantityA5 = 0 (RSRP)

M (n)

A5 Condition 1

A5 Event starts

A5 Condition 2timeToTriggerA5 = 640

M (S)

M (n)

A5 Event starts

M (S)

B2 EVENT




B2 Condition 1 ends: RSRP(meas) (or RSRQ) > -139 or (-194)b2Threshold1Rsrp (or b2Threshold1Rsrq) =-140 (or -195)B2 Condition 1 starts: RSRP(meas) (or RSRQ) < -141 or (-196)

b2Threshold2RscpUtra(or b2Threshold2EcNoUtra or b2Threshold2Geran)=-115 (or -24 or -110)



RSRP (or RSRQ) for Serving Cell depending on Parameter: triggerQuantityA2Prim = 0 (RSRP) and triggerQuantityB2 = 0 (RSRP) and for 3G Target Cell: measQuantityUtraFDD = 0 (RSCP)





B2 Condition 1 ends: RSRP(meas) (or RSRQ) > -139 or (-194)b2Threshold1Rsrp (or b2Threshold1Rsrq) =-140 (or -195)B2 Condition 1 starts: RSRP(meas) (or RSRQ) < -141 or (-196)

B2 Condition 2 starts: Either: RSCP (or EcNO) > -114( or -23) (or OR: GERAN > -109)

b2Threshold2RscpUtra(or b2Threshold2EcNoUtra or b2Threshold2Geran)=-115 (or -24 or -110)B2 Condition 2 ends: Either: RSCP (or EcNO) < -116( or -25)( or OR: GERAN < -111)


Back To: Mobility Parameters

RSRP (or RSRQ) for Serving Cell depending on Parameter: triggerQuantityA2Prim = 0 (RSRP) and triggerQuantityB2 = 0 (RSRP) and for 3G Target Cell: measQuantityUtraFDD = 0 (RSCP)

A2 Event starts



hysteresisB2 = 1 B2 Condition 1

B2 Event Starts

B2 Condition 2

hysteresisB2 = 1 timeToTriggerB2 = 640


M (S)M (n)

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Calculator for LTE Mobility Events