05-Inter-RAT Cell Reselection and Handover-59

Inter-RAT Cell Reselection and Handover

ZTE University

WCDMA-GSM/GPRS Inter-RAT Transition State Diagram

Content

n Inter-RAT Cell Reselectionn Inter-RAT Handover

Inter-RAT Cell Reselection Strategy

n In idle mode, cell reselection from WCDMA to GSM/GPRS enables the UE to choose a new cell in another system to camp on, ensuring service availability when WCDMA coverage deteriorates.

n Cell reselection from GSM/GPRS to WCDMA allows the UE to return to WCDMA, where it can access more advanced services.

n Cell Reselection is always used to return to WCDMA, which has higher priority.

Inter-RAT Cell Reselection Procedure

n It consists of three steps:l 1. Measuring serving cell and the neighbor cells on

current system and other system.l 2. Ranking the measured cells.l 3. Determining reselection.

3G→2G Cell Reselection Procedure

3G→2G Cell Reselection Procedure -Measurement

n When the UE is camping on a 3G cell, inter-RAT cell reselection measurement is triggered by measurement rule

n Qqualmeas represents measured quality of serving cell, typically CPICH Ec/No. Qqualmin, SsearchRAT are the parameters broadcast by UTRAN as system information. Qqualmin indicates the cell’s minimum required quality value which fulfills the cell selection suitability criterion. SsearchRAT indicates the threshold to trigger the measurement for inter-RAT cell reselection.

n If SsearchRAT is not broadcast, the UE will perform inter-RAT neighbor cell quality measurement. Whether to broadcast SsearchRAT or not is controlled by the parameter OtherRATInfoPre.

n To estimate the quality of the GSM/GPRS cells, GSM Broadcast Control Channel (BCCH) carrier measurements are collected in terms of Received signal Level Averaged (RLA).

3G→2G Cell Reselection Procedure –Ranking

n After measurement, it will rank all the measured cells, according to the following ranking criteria:

Serving cell: Rs = Qmeas,s + Qhyst1s

Neighbor cell: Rn = Qmeas,n − Qoffset1s,n

n Qmeas,s represents the measured signal quantity of serving cell, typically CPICH RSCP of the WCDMA.

n Qmeas,n represents the measured signal quantity of neighbor cell.n Qhyst1s indicates the hysteresis value for FDD cells when the

measurement quantity for cell reselection is CPICH RSCP. n Qoffset1s,n indicates the offset between the serving cell and

neighbor cell when measurement quantity is CPICH RSCP.

3G→2G Cell Reselection Procedure –Determinationn If a 2G cell ranks higher than any 3G cell for Treselection

seconds, the UE reselects to that 2G cell. This implies it being at least (Qhyst1s + Qoffset1s,n) better than the 3G serving cell, and better than any other 3G measured cell for Treselection seconds:

Rn(GSM) > Rs(WCDMA) and Rxlev(GSM) > Qrxlevmin

Qrxlevmin indicates the cell’s minimum required Rx level value which fulfills the cell selection suitability criterion.

Inter-RAT Cell Reselection Sample

3G→2G Cell Reselection Key Parameter List

The parameter indicates the hysteresis value for FDD cells when the measurement quantity for cell reselection is CPICH RSCP.Qhyst1s

The parameter indicates the threshold to trigger the measurement for inter-RAT cell reselection.SSearchRat

The parameter indicates the cell’s minimum required Rx level value which fulfills the cell selection suitability criterion. The measured cell whose CPICH RSCP or Rx level is lower than Qrxlevmin cannot be selected.

Qrxlevmin

This parameter indicates the cell reselection timer value.Treselection

The parameter indicates the offset between the serving cell and neighbor cell when measurement quantity is CPICH RSCP.Qoffset1s,n

The parameter indicates the cell’s minimum required quality value which fulfills the cell selection suitability criterion. The measured cell whose CPICH Ec/No is lower than Qqualmin cannot be selected.

Qqualmin

ExplanationParameter

3G→2G Cell Reselection Key Parameter

1: CPICH Ec/No Default Value

Parameter name Measurement Quantity for Cell Selection and Reselection

Abbreviated name QualMeas

Description This parameter indicates the measurement quantity for cell selection and reselection.

Range and Step 1: CPICH Ec/No2: CPICH RSCP

Unit N/A

OMCR Path View->Configuration Management->RNC NE->RNC Radio Resource Management->UtranCell->UtranCellXX->Cell Selection and Reselection-> Cell Selection and ReselectionX-> Modify Advanced Parameter-> Measurement Quantity for Cell Selection and Reselection


-18 dB Default Value

Parameter name QqualminAbbreviated name QQualMin

Description This parameter indicates the cell’s minimum required quality value which fulfills the cell selection suitability criterion. If value of the parameter is increased, it’s harder for the cell to satisfy the condition of being selected.If value of the parameter is decreased, it’s easier for the cell to satisfy the condition of being selected.

Range and Step [-24, 0]dB; Step 1 dB

Unit dB

OMCR Path View->Configuration Management->RNC NE->RNC Radio Resource Management->UtranCell->UtranCellXX->Cell Selection and Reselection-> Cell Selection and ReselectionX-> Modify Advanced Parameter-> Qqualmin(dB)


-115 dBm Default Value

Parameter name Qrxlevmin Abbreviated name QRxLevMinDescription This parameter indicates the minimum required received level of

the cell which satisfies the condition of being selected or reselected by UE. When the measurement quantity is CPICH RSCP, only the measured received power level of the cell is larger than Qrxlevmin can the cell be selected. If value of the parameter is increased, it’s harder for the cell to satisfy the condition of being selected.If value of the parameter is decreased, it’s easier for the cell to satisfy the condition of being selected.

Range and Step [-115, -25]dBm; Step 2 dBm Unit dBm

OMCR Path View->Configuration Management->RNC NE->RNC Radio Resource Management->UtranCell->UtranCellXX->Cell Selection and Reselection-> Cell Selection and ReselectionX-> Modify Advanced Parameter->Qrxlevmin(dBm)


2 dB Default Value

Parameter name S-search,RATAbbreviated name SSearchRatDescription This parameter indicates the inter-RAT measurement triggering

threshold for cell reselection used by UE to judge whether inter-RAT measurement should be performed. If the quality of serving cell exceeds Ssearch,RAT, UE does not perform inter-RAT measurement; if the quality of serving cell is not larger than Ssearch,RAT or if Ssearch,RAT is not configured, UE performs inter-RAT measurement. When Ssearch,RAT is delivered to the UE, if its value is increased, it’s easier for the UE to trigger inter-RAT measurement.If value of the parameter is decreased, it’s harder for the UE to trigger inter-RAT measurement.

Range and Step [0, 20]dB; Step 2 dB Unit dB

OMCR Path Configuration Management->RNC NE->RNC Radio Resource Management->UtranCell->UtranCellXX->Cell Selection and Reselection-> Cell Selection and ReselectionX-> Modify Advanced Parameter-> S-search,RAT(dB)


1: True Default Value

Parameter name Other RAT Information Configuration Tag Abbreviated name OtherRATInfoPre

Description This parameter is a switch indicating whether inter-RAT information parameters used for cell reselection are configured or not. If the value is False, inter-RAT information parameters are not configured to UE, and UE performs the inter-RAT measurement periodically according to the period indicated by the parameter Treselections. If the value is True, inter-RAT information parameters are configured to UE, and UE judges whether to perform the inter-RAT measurement.

Range and Step 0: False1: True

Unit N/A

OMCR Path View->Configuration Management->RNC NE->RNC Radio Resource Management->UtranCell->UtranCellXX->Cell Selection and Reselection-> Cell Selection and ReselectionX-> Modify Advanced Parameter-> Other RAT Infor Configuration Tag


2 dB Default Value

Parameter name Qhyst1-s

Abbreviated name QHyst1S

Description This parameter indicates the hysteresis value for FDD cells in case the quality measure for cell selection and reselection is set to CPICH RSCP. In cell-ranking criterion R of cell reselection, the R value of serving cell equals to the measured value plus the hysteresis value.

Range and Step [0, 40]dB; Step2 dB

Unit dB

OMCR Path View->Configuration Management->RNC NE->RNC Radio Resource Management->UtranCell->UtranCellXX->Cell Selection and Reselection-> Cell Selection and ReselectionX-> Modify Advanced Parameter-> Qhyst1-s(dB)


0 dB Default Value

Parameter name Qoffset1s,n in SIB11 Abbreviated name Qoffset1SNSib11 Description This parameter indicates the quality offset of the service

cell and neighboring cell when the measurement quantity is CPICH RSCP. This parameter is required when queues cells in the cell reselection rule. This parameter is broadcast to UE in SIB11.If value of the parameter is increased, it’s harder for the neighboring cell to satisfy the condition of being selected.If value of the parameter is decreased, it’s easier for the neighboring cell to satisfy the condition of being selected

Range and Step OMCR: [-50, 50]dBRNC: D=P+50, [0, 100]

Unit dB

OMCR Path View->Configuration Management->RNC NE->RNC Radio Resource Management->UltranCell->UltranCellXXX->Neighbouring Cell -> Advanced Parameter Manager->Qoffset1s,n in SIB11(dB)


1s Default Value

Parameter name Treselection

Abbreviated name

Treselection

Description This parameter indicates the cell reselection timer value. UE shall reselect the new cell if the new cell is better ranked than the serving cell according to the cell-ranking criterion R during a time interval indicated by Treselections.

Range and Step [0, 31]s; step 1s

Unit s

OMCR Path View->Configuration Management->RNC NE->RNC Radio Resource Management->UltranCell-> UtranCellXX->Cell Selection and Reselection-> Cell Selection and ReselectionX-> Treselection(s)

2G→3G Cell Reselection Procedure重要

2G→3G Cell Reselection Key Parameter List

0(- ∞)Applies an offset to RLA for WCDMA cell reselection

FDD_Qoffset

Value for 3G higher priority

strategyExplanationParameter

7(always)Qsearch_I indicates whether inter-RAT measurements shall be performed when RLA of the serving cell is below or above the threshold.

Qsearch_I

7( -13 dB)Minimum CPICH Ec/No threshold for WCDMA cell reselection

FDD_Qmin


0(-20 dB)Default Value

N/AUnit

0, 1, 2, 3, 4, 5, 6, 7

0~7 stands for (–20+n) dB respectivelyRange and Step

The parameter indicates the Minimum CPICH Ec/No threshold for WCDMA cellDescription

FDD_QminAbbreviated name

FDD_QminParameter name


8(0 dB)Default Value

N/AUnit

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 150=-∞(always select a cell if acceptable)

1 ~ 15 corresponding to -28 ~ 28dB with step 4dB

Range and Step

The parameter indicates an offset to RLA for WCDMA cell reselection

Description

FDD_QoffsetAbbreviated name

FDD_QoffsetParameter name


15Default Value

N/AUnit

0. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15l0 ~ 6: L= -98+n*4 dbm；l7: always；l8 ~ 14: L= -78+4*(n-8)dbm；l15: never

Range and Step

The parameter indicates whether inter-RAT measurements shall be performed when RLA of the serving cell is below or above the threshold.

Description

Qsearch_IAbbreviated name

Qsearch_IParameter name

Content

n Inter-RAT Cell Reselectionn Inter-RAT Handover

Inter-RAT Handover Strategy

n Inter-RAT handover is used in connected mode to maintain the required quality and guarantee service continuity when WCDMA coverage deteriorates.

n Inter-RAT handover is a hard handover, usually based on UE measurements. The UTRAN instructs UE to monitor the quality of the current cell and system and, if quality fallsbelow a specified threshold, to monitor the signal strength of the other system.

n Besides, inter-RAT handover can be blind handover based on shared coverage. No measurement is made on the target system and the target cell is retrieved from system information broadcast.

Inter-RAT Handover Strategy

n The inter-RAT handover procedure depends on the UE’sdomain. In CS domain, WCDMA implements a seamless inter-system hard handover. In PS domain, the procedure is based on a cell reselection process that cannot maintain the QoS.

n For voice services in CS domain, inter-RAT handover in the 3G-to-2G direction has higher priority because good GSM coverage is assumed, and normally no need to return to WCDMA. The UE reselects back to WCDMA after the call is released. This avoids unnecessary inter-RAT handovers, which can increase the risk of dropped calls.

3G→2G Handover Procedure(CS Domain)

n It consists of three steps:l 1. Setup measurements in UTRAN.l 2. Start compressed mode and perform GSM

measurements.l 3. Execute the Inter-RAT handover.

3G →2G Handover Procedure(CS Calls)

Inter-RAT Handover Procedure(PS Domain)

n It consists of three steps:l 1. Setup measurements in UTRAN.l 2. Perform measurements on GSM/GPRS.l 3. Execute the inter-RAT cell change order.

n The measurements of Inter-RAT handover for PS calls and CS calls are the same; however, the handover execution procedure is different.

3G →2G Handover Procedure(PS Calls)

Event Triggered Measurement and Handover

n The measured quantity can be CPICH Ec/No or RSCP. The specific parameter used is controlled by the NonIntraMeasQuan parameter. The measured quantity of Inter-RAT measurement depends on the systems to be measured. For the GSM/GPRS, the measured quantity is RSSI.

n ZTE UMTS supports event 3a, 3c for inter-RAT handover. And uses event 2d, 2f as the criteria for evaluating the signal quality of the current frequency. If the UE reports 2d event, which means the current carrier is in poor signal quality, and no inter-frequency neighboring cells exist, or the UE reports a 2e event after inter-frequency measurement is started (which means the signal quality of the measured inter-frequency neighboring cell is also poor), the RNC tries to initiate Inter-RAT blind handover or start Inter-RAT measurement 3a or 3c event.

Condition to trigger Event 2d

n Event 2D: The quality of working carrier frequency is

lower than a threshold.n QUsed: Refers to the measurement result of current

working carrier frequency.n TUsed 2d: Refers to the absolute threshold

(ThreshUsedFreq) of poor quality of working carrier frequency in Event 2D decision.

n H2d: Refers to handover decision hysteresis parameter (Hysteresis(Inter)) of Event 2D.

/2HTQ 2d2dUsedUsed −≤

Condition to trigger Event 2e

n Event 2E: The quality of non-working carrier

frequency is lower than a threshold. n QNon used: Refers to the measurement result of

current non-working carrier frequency.n TNon used 2e: Refers to the absolute threshold

(ThreshNoUsedFreq) of good quality of non-working carrier frequency in Event 2E decision.

n H2e: Refers to handover decision hysteresis parameter (Hysteresis) of Event 2E.

/2HTQ 2e2eusedNonusedNon −≤

Condition to trigger Event 2f

n Event 2F: The quality of working carrier frequency is

higher than a threshold. n QUsed: Refers to the measurement result of current

working carrier frequency.n TUsed 2f: Refers to the absolute threshold

(ThreshUsedFreq) of poor quality of working carrier frequency in Event 2F decision.

n H2f: Refers to handover decision hysteresis parameter (Hysteresis(Inter)) of Event 2F

/2HTQ 2f2fUsedUsed +≥

UTRAN Measurement

n QUTRAN :indicates the measurement result of the currently used UTRAN frequency (dB for Ec/No; dBm for RSCP).

n MUTRAN : indicates the measured physical value of the currently used UTRAN frequency (ratio for Ec/No; mV for RSCP).

n Mi : indicates the measured physical value of cell I in the current active set.

n NA : indicates the number of the cells (excluding best cells) in an active set.

n MBest : indicates the measurement result of the best cells in an active set.

n W : indicates the weight of the best cells in an active set in thefrequency quality evaluation of the currently used UTRAN.

Best

N

1iiUTRANUTRAN LogM10W)(1MLog10WLogM10Q

A

⋅⋅−+

⋅⋅=⋅= ∑

=

Condition to trigger Event 3a

n 3A: The currently used UTRAN carrier quality is lower than a threshold, and the quality of other radio systems is higher than a threshold. It is used for decision of Inter-RAT handover.

n QUsed :indicates the estimated quality of the used frequency of the UTRAN.

n TUsed :indicates the absolute threshold (Thresh[MAX_RAT_MEAS_EVENT]) of the currently used frequency difference.

n H3a: is the hysteresis parameter (Hysteresis[MAX_RAT_MEAS_EVENT] (Rat)) for 3A event decision.

n MOther RAT :is the quality measurement result of other systems.n CIOOther RAT: is the quality offset of other system cells

(CellIndivOffset(gsmRelation).n TOther RAT: is the absolute threshold of other systems

(ThreshSys[MAX_RAT_MEAS_EVENT])

/2HTQ 3aUsedUsed −≤ /2HTCIOM 3aRATOtherRATOtherRATOther +≥+and

:

Condition to trigger Event 3c

n 3C: The quality of other radio systems is higher than a threshold. It can be used for Inter-RAT handover decision.

n MOther RAT : the quality measurement result of other systems.

n CIOOther RAT : the quality offset of other system cells (CellIndivOffset(gsmRelation).

n TOther RAT : the absolute threshold of other systems (ThreshSys[MAX_RAT_MEAS_EVENT]).

n H3c : the hysteresis parameter (Hysteresis[MAX_RAT_MEAS_EVENT] (Rat)) for 3C event decision.

:

/2HTCIOM 3cRATOtherRATOtherRATOther +≥+

Inter-RAT Handover Sample

Time

CPICHRSCP/RSSI

UMTS Cell

GSM Cell

Reporting Event 3a

Reporting Event 2dTrigTime2d TrigTime3a

Perform measurement of GSM/GPRS neighbor cell

Perform Inter-RAThandover

ThreshUsedFreq 2d – Hysteresis 2d /2

ThreshSys 3a + Hysteresis 3a /2

Thresh 3a – Hysteresis 3a /2

GSM

UMTS


Ec_f1

GSM

2D t2F 2D

2F

3A

2D

3A(G)

RSCP

3A(W)


Ec_f1

GSM

Ec_f2

2D t2F 2D

2F

2E 3A

2D 2E

3A(G)

RSCP

3A(W)

Intra-RAT Handover Key Parameter List

4dBHystersis 3c

4dBHystersis 3a

-95dBmAbsolute Threshold of the Quality of Other RAT for 3c

-90dBmAbsolute Threshold of the Quality of Other RAT for 3a

0Weight of the UTRAN System for 3a

-95dBmAbsolute Threshold of the Quality of UTRAN Cell for 3a

3a Event TriggerInter-RAT Handover Tactic

0Measurement Priority of Neighboring GSM Cell

Default ValueParameter Name

Intra-RAT Handover Key Parameter List

NeighborShare Cover Indication

RSCPUTRAN Measurement Quantity for Inter-frequency and Inter-RAT Measurements

0dBCell individual offset(gsmRelation)ReportGSM Carrier RSSI Reporting IndicatorNot ReportUTRAN Quality Estimation Reporting IndicatorRequiredGSM BSIC Verification Required Indicator3GSM Filter Coefficient(RAT)3UTRAN Filter Coefficient(RAT)100msTime To Trigger 3c100msTime To Trigger 3aDefault ValueParameter Name

Inter-RAT Handover Parameter

0Default Value (note)ViewàConfiguration ManagementàRNCNEàRNC Radio Resource ManagementàUtranCellàUtran Cell XXXàGSM NeighbouringCellàGSM Neighbouring Cell XXXàMeasurement Priority of Neighboring GSMCell

OMCR Path

N/AUnit

[0, 2]Range and Step

This parameter indicates the measurement priority of the neighboring cell. The highest priority is 0, the lowest priority is 2.

DescriptionMeasPrioAbbreviated nameMeasurement Priority of Neighboring GSM CellParameter name


0: NeighborDefault Value (note)

ViewàConfiguration ManagementàRNC NEàRNC Radio Resource ManagementàUtran CellàUtranCell XXXàGSM Neighbouring Cellà GSM Neighbouring Cell XXX àShare Cover Indication

OMCR Path

N/AUnit

0: Neighbor1: Overlap2: Covers3: Contained in

Range and Step

This parameter describes the neighboring relationship of the serving cell and Gsm neighboring cell.

Description

GsmShareCoverAbbreviated name

Share Cover IndicationParameter name


1: 3A Event TriggerDefault Value (note)

ViewàConfiguration ManagementàRNC NEàRNC Radio Resource ManagementàUtran CellàUtranCell XXXàModify Advanced ParameteràUtran Cell->Inter-RAT Handover Tactic

OMCR Path

N/AUnit

0: Algorithm Deciding1: 3A Event Trigger2: 3C Event Trigger

Range and Step

This parameter indicates the inter-RAT handover tactic.

Description

RatHoTacticAbbreviated name

Inter-RAT Handover TacticParameter name


1: RSCPDefault Value (note)ViewàConfiguration ManagementàRNC NEàRNC Radio Resource ManagementàUtran CellàUtran Cell XXXàModify Advanced ParameteràUtran CellàUTRANMeasurement Quantity for Inter-frequency and Inter-RAT Measurements

OMCR Path

N/AUnit

0: Ec/No1: RSCP2: Ec/No and RSCP

Range and Step

This parameter indicates UTRAN measurement quantity for inter-frequency and inter-RAT measurements.

DescriptionNonIntraMeasQuanAbbreviated name

UTRAN Measurement Quantity for Inter-frequency and Inter-RAT Measurements

Parameter name


0dBDefault Value (note)ViewàConfiguration ManagementàRNC NEàRNC Radio Resource ManagementàGSM CellàGSM Cell XXXàModify Advanced ParameteràCell Individual Offset(dB)

OMCR Path

dBUnit

OMCR: [-10, 10]dB step 0. 5RNC: D= (P+10) *2, [0, 40]

Range and Step

An offset is allocated for each cell being monitored. The offset can be positive or negative. Before the UE judges whether an event occurs, adds the offset to the measurement result. If the PCPICH uses a positive offset, the UE sends the measurement report just like PCPICH is x dB better than the actual case. Or, if the PCPICH uses a negative offset, the PCPICH report is limited. When the cell individual offset is used, the corresponding cell is possibly (at least temporarily) the target cell of the handover or removed from the active set.

DescriptionCellIndivOffset(gsmRelation)Abbreviated nameCell individual offset(gsmRelation)Parameter name


For own system CPICH Ec/No, UE event report parameter: [-6, -24,-24,-24]For own system CPICH RSCP, UE event report parameter: [-95, -115,-115,-115]

Default Value (note)

ViewàConfiguration ManagementàRNC NEàRNC Radio Resource Managementà Modify Advanced ParameteràUE Inter-RAT Measurement Configuration InformationàAbsolute Threshold of the Quality of UTRAN Cell for 3A

OMCR Path

dBm/ dBUnit

CPICH RSCP:[-115, -25] dBm step 1dBmCPICH Ec/No: [-24, 0] dB step 1dB

Range and Step

This parameter indicates the absolute threshold of the UTRAN cell quality that UE uses to judge event 3a. The range and Unit of the parameter relate to the measurement quantity of UTRAN system.MAX_RAT_MEAS_EVENT is the maximum number of inter-RAT measurement events which takes the value of 4.

DescriptionThresh[MAX_RAT_MEAS_EVENT]Abbreviated nameAbsolute Threshold of the Quality of UTRAN Cell for 3AParameter name


For own system CPICH Ec/No, UE event report parameter: [0, -, -, -]For own system CPICH RSCP, UE event report parameter: [0, -, -, -]


ViewàConfiguration ManagementàRNC NEàRNC Radio Resource Managementà Modify Advanced ParameteràUEInter-RAT Measurement Configuration InformationàWeightof the UTRAN System for 3A

OMCR Path

N/AUnit[0.0, 2.0] step 0.1Range and Step

This parameter is used when judging the quality of the UTRAN system in inter-RAT measurement, which indicates the weight of the best cell in the quality judgment (only for event 3a).MAX_RAT_MEAS_EVENT is the maximum number of inter-RAT measurement events which takes the value of 4.

DescriptionW[MAX_RAT_MEAS_EVENT]Abbreviated nameWeight of the UTRAN System for 3AParameter name


[-90, -95, -95, -115]dBmDefault Value (note)ViewàConfiguration ManagementàRNC NEàRNC Radio Resource Managementà Modify Advanced ParameteràUEInter-RAT Measurement Configuration Informationà Absolute Threshold of the Quality of Other RAT for 3A/3B/3C

OMCR Path

dBm/ dBUnit

CPICH RSCP: [-115, -25]dBm step 1dBmCPICH Ec/No: [-24, 0] dB step 1dB

Range and Step

This parameter indicates the absolute threshold used when judging the quality of other RAT configured for event 3a/3b/3c. The value range and Unit of this parameter are related to the measurement quantity of other system, at present the measurement quantity can only be GSM Carrier RSSI of the GSM system, which corresponds to the CPICH RSCP of UTRAN system, so the value range and Unit of this parameter correspond to the CPICH RSCP.MAX_RAT_MEAS_EVENT is the maximum number of inter-RAT measurement events which takes the value of 4.

DescriptionThreshSys[MAX_RAT_MEAS_EVENT]Abbreviated name

Absolute Threshold of the Quality of Other RAT for 3A/3B/3C

Parameter name


For own system CPICH Ec/No, UE event report parameter: [4,4,2,4]dBFor own system CPICH RSCP, UE event report parameter: [4,4,4,4]dB


ViewàConfiguration ManagementàRNC NEàRNC Radio Resource Managementà Modify Advanced ParameteràUE Inter-RAT Measurement Configuration Informationà Hysteresis

OMCR Path

dBUnit(0, …, 7.5)dB step 0.5dBRange and Step

This parameter indicates the hysteresis used when judging whether to trigger the event. This parameter makes it different between the status to trigger an event and the status to leave the event, so as to avoid the trigger status change due to very small change.The larger the value is, the larger the difference between the status to trigger the event and the status to leave the event will be.This parameter is related to the measurement quantity and the event type.Different events are configured separately and can be configuredwith different hysteresisMAX_RAT_MEAS_EVENT is the maximum number of inter-RAT measurement events which takes the value of 4.

DescriptionHysteresis[MAX_RAT_MEAS_EVENT]Abbreviated nameHystersis(dB)Parameter name


For own system CPICH Ec/No, UE event report parameter: [100,100,100,100]msFor own system CPICH RSCP, UE event report parameter: [100,100,100,100]ms


ViewàConfiguration ManagementàRNC NEàRNC Radio Resource Managementà Modify Advanced ParameteràUE Inter-RAT Measurement Configuration Informationà Time to Trigger

OMCR Path

MsUnit

(0, 10, 20, 40, 60, 80, 100, 120, 160, 200, 240, 320, 640, 1280, 2560, 5000)ms

Range and Step

This parameter indicates the time difference between having detected the event generation and reporting the event. Only when the event generation is detected and still meets all requirements of eventtriggering after Time to trigger, the event can be triggered andreported. The larger the value is, the stricter the judgment is for the event to be triggered. The parameter should be set according to the actual requirements. Sometimes, if it is set too large, the quality of calls may decrease.MAX_RAT_MEAS_EVENT is the maximum number of inter-RAT measurement events which takes the value of 4.

DescriptionTrigTime[MAX_RAT_MEAS_EVENT]Abbreviated nameTime To Trigger(ms)Parameter name


UE Event Report Parameters for Own System CPICH Ec/No: 3UE Event Report Parameters for Own System CPICH RSCP: 3


ViewàConfiguration ManagementàRNC NEàRNC Radio Resource ManagementàModify Advanced ParameteràUE Inter-Rat MesurementConfigurationàUTRAN Filter Coefficient

OMCR Path

N/AUnit(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 17, 19)Range and Step

This parameter indicates the filtering factor of UTRAN when UE performs the L3 filtering on the measurement results of the inter-RAT measurement.

Description

FilterCoeff(Rat)Abbreviated name

UTRAN Filter Coefficient(Rat)Parameter name


For own system CPICH Ec/No, UE event report parameter: 3For own system CPICH RSCP, UE event report parameter: 3


ViewàConfiguration ManagementàRNC NEàRNC Radio Resource ManagementàModify Advanced ParameteràUEInter-Rat Mesurement ConfigurationàGSM Filter Coefficient

OMCR Path

N/AUnit

(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 17, 19)Range and Step

This parameter indicates the filtering factor of GSM when UE performs the L3 filtering on the measurement results of the inter-RAT measurement.

DescriptionGsmFilterCoeffAbbreviated nameGSM Filter Coefficient(Rat)Parameter name


UE Event Report Parameters for Own System CPICH Ec/No: RequiredUE Event Report Parameters for Own System CPICH RSCP: Required


ViewàConfiguration ManagementàRNC NEàRNC Radio Resource ManagementàModify Advanced ParameteràUE Inter-Rat Mesurement Configurationà GSM BSIC Verification Required Indicatior

OMCR Path

N/AUnit

0: Require Confirm1: Not Required Confirm

Range and Step

This parameter indicates whether to confirm the BSIC of GSM cells when performing the Inter-RAT measurement. BSIC = NCC (Network Color Code) + BCC (Base Color Code). BSIC can be used to identify the GSM cells. If the value is ‘Not Required ‘, UE does not confirm the BSIC when measuring the GSM cells. If the value is ‘Required ‘, UE confirms the BSIC when measuring the GSM cells, and then queue the confirmed BSIC cells according to the measurement results. In each measurement period, re-confirm and measure the BSIC in the order of the measurement results, from good to bad.

DescriptionBSICVeriReqAbbreviated nameGSM BSIC Verification Required IndicatiorParameter name


For own system CPICH Ec/No, UE event report parameter: Not ReportFor own system CPICH RSCP, UE event report parameter: Not Report


ViewàConfiguration ManagementàRNC NEàRNC Radio Resource ManagementàModify Advanced ParameteràUEInter-Rat Mesurement Configurationà UTRAN Quality Estimation Reporting Indicator

OMCR Path

N/AUnit

0: Not Report (False)1: Report (True)

Range and Step

This parameter indicates whether the report of the estimation quality of UTRAN system is requested or not.

DescriptionUtranEstQualAbbreviated nameUTRAN Quality Estimation Reporting IndicatorParameter name


For own system CPICH Ec/No, UE event report parameter: ReportFor own system CPICH RSCP, UE event report parameter: Report


ViewàConfiguration ManagementàRNC NEàRNC Radio Resource ManagementàModify Advanced ParameteràUEInter-Rat Mesurement Configurationà GSM Carrier RSSI Reporting Indicator

OMCR Path

N/AUnit

0: Not Report (False)1: Report (True)

Range and Step

This parameter indicates whether the report of RSSI of the GSM cells is requested or not. Since the measurement quantity of the GSM cell is only GSM Carrier RSSI, in inter-RAT measurement Event Reporting Criteria, there is no need to report this parameter when measuring the GSM cell and performing the Inter-RAT handover. In the periodical reporting criteria, GSM carrier RSSI report is required.

DescriptionGsmCarrRSSIIndAbbreviated nameGSM Carrier RSSI Reporting IndicatorParameter name

Documents

05-Inter-RAT Cell Reselection and Handover-59