Introduction and Guidelines In LTE systems Mobility is complicated since there are lots of scenarios including lots of pa The purpose for this KO is to simplify the calculation for the Mobilty events (Idle Mode and The Mobility "Parameter sheet" includes many parameters controlling Mobility thresholds iflue You can make use the available paramters values as Baseline. You can also change the paramete The "Mobility Events" sheet shows the formula's with the parameters inputed in the "Mobilty P When you change the thresholds or parameters in the "Mobility Parameter" sheet, they will be Additionally, there are TAB's for different Events showing the thresholds in graphs for bette The threshold values are also related to the parameter values in the "Mobility Parameters" sh This is very helpful when you need to make new Mobility strategies; you can select different This is important to set the proper mobility parameters, espcially there are many dependencie The Events that are illustrated Graphycally are: This KO illustrates the mobility events in LTE showing the parameters, thresholds, formulas a The graphs with the thresholds triggering the mobility events will be helpful also to visuali Using this KO will be mostly beneficial to facilitate calculation of mobility event threshold 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 Event Connected Mode: IRAT Session ContinuityA2 Event 3G Idle Mode: Cell-reselection (UMTS->LTE) A5 Event B2 Event
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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]
MO ClassEUtranCellFDDsystemInformationBlock3systemInformationBlock3EUtranFreqRelationEUtranFreqRelationUtranFreqRelation/GeranFreqGroupRelationsystemInformationBlock3UtranFreqRelationsystemInformationBlock3UeMeasControlReportConfigEUtraBestCellReportConfigEUtraBestCellUeMeasControla2ThresholdRsrpPrima2ThresholdRsrqSecReportConfigEUtraBadCovPrimUtrancellUtrancellEutranFreqrelationEutranFreqrelationReportConfigA1PrimReportConfigA1PrimReportConfigA1PrimReportConfigA1PrimReportConfigA1SecReportConfigA1SecReportConfigA1SecReportConfigA1SecReportConfigEUtraBadCovPrimReportConfigEUtraBadCovSecUeMeasControlEutranFreqRelationUtranFreqRelationGeranFreqGroupRelationEutranFreqRelation/UtranFreqRelationUeMeasControlReportConfigEUtraBadCovPrimReportConfigEUtraBadCovSecReportConfigEUtraBadCovSecReportConfigEUtraBadCovPrimReportConfigEUtraBadCovSecReportConfigB2Utra/ReportConfigB2GeranReportConfigB2Utra/ReportConfigB2GeranReportConfigB2UtraReportConfigB2UtraReportConfigB2GeranReportConfigB2Utra/ReportConfigB2GeranReportConfigB2Utra/ReportConfigB2GeranReportConfigB2Utra/ReportConfigB2GeranUeMeasControlEutranFreqRelation/UtranFreqRelation/GeranFreqGroupRelationUeMeasControlUeMeasControlUeMeasControlReportConfigA5ReportConfigA5ReportConfigA5ReportConfigA5ReportConfigA5
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.
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.
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.
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.
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
Back To: Mobility ParametersBack To: Mobility EventsBack to: Introduction
RSRP (or RSRQ) for Serving Cell depending on Parameter: triggerQuantityA2Prim = 0 (RSRP) and triggerQuantityA5 = 0 (RSRP)
A2 Event starts
hysteresisA2Prim = 2
timeToTriggerA2Prim = 480
hysteresisA5 = 1
hysteresisA5 = 1
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)
b2Threshold2RscpUtra(or b2Threshold2EcNoUtra or b2Threshold2Geran)=-115 (or -24 or -110)
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
Back To: Mobility ParametersBack To: Mobility EventsBack to: Introduction
RSRP (or RSRQ) for Serving Cell depending on Parameter: triggerQuantityA2Prim = 0 (RSRP) and triggerQuantityB2 = 0 (RSRP) and for 3G Target Cell: measQuantityUtraFDD = 0 (RSCP)
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)
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
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
hysteresisA2Prim = 2
timeToTriggerA2Prim = 480
hysteresisB2 = 1 B2 Condition 1
B2 Event Starts
B2 Condition 2
hysteresisB2 = 1 timeToTriggerB2 = 640
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