Intra-Frequency Handover Measurement

1. Intra-Frequency Handover Overview 2. Intra-Frequency Handover Procedure

1. Intra-Frequency Handover Measurement 2. Intra-Frequency Handover Decision and Execution 3. Neighboring Cell Combination Algorithm

3. Signaling Procedures for Intra-Frequency Handover

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UE UTRAN

MEASUREMENT CONTROL

Intra-Frequency Handover Measurement

MEASUREMENT CONTROL

z The measurement control message carries the following information:

z Event trigger threshold

z Hysteresis value

z Event trigger delay time

z Neighboring cell list

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UE UTRAN

MEASUREMENT REPORT

MEASUREMENT REPORT

Intra-Frequency Handover Measurement

z The purpose of the measurement reporting procedure is to transfer measurement results from the UE to UTRAN.

z Based on the algorithm in measurement control, the UE will measure the signal strength or quality and check if it meet the requirement of all event. If it meet the requirement of any event, UE will send the measurement report to UTRAN to trigger the handover. The most important information in the measurement are the PSC , the CPICH Ec/No of the target cell, and the triggered event.

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Intra-Frequency Handover Measurement

z L3 Filtering for Intra-Frequency Handover

z The value after L3 filtering procedure is calculated according to following formula:

Fn = (1 -α) x Fn-1 + αx Mn

z where

z Fn is the new measurement value obtained after L3 filtering.

z Fn-1 is the last measurement value obtained after L3 filtering.

z Mn is the latest measurement value obtained from the physical layer.

z α= 1/2(k/2) (k is set to Intra-freq meas L3 filter coeff)

z When αis set to 1, that is, k = 0, no L3 filtering is performed.

z A is measurement value at the physical layer

z B is the measurement value after layer 1 filtering at physical layer. The value goes from the physical layer to high layer

z C is measurement after processing in the layer3 filter

z C’ is another measurement value

z D is measurement report information sent on the radio interface or Iub interface

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Key parameters of Intra-frequency Measurement

z Intra-freq Measure Quantity

‡ Parameter ID: IntraFreqMeasQuantity

‡ The default value of this parameter is CPICH_Ec/No

z Intra-freq meas L3 filter coeff

‡ Parameter ID: FilterCoef

‡ The default value of this parameter is 3

The measurement quantity of intra-frequency handover can be Common Pilot Channel (CPICH) Ec/No or CPICH Received Signal Code Power (RSCP). It can be used in all the measurement events of intra-frequency handover

zIntra-freq Measure Quantity

‡Parameter ID: IntraFreqMeasQuantity

‡Value range: CPICH_Ec/No, CPICH_RSCP

‡Content: This parameter specifies the measurement quantity used in intra- frequency measurement.

‡The default value of this parameter is CPICH_Ec/No

‡Set this parameter through SET INTRAFREQHO/ADD CELLINTRAFREQHO/MOD CELLINTRAFREQHO.

Before judging a measurement event and sending the measurement report, the UE performs L3 filtering for the measurement value.

zIntra-freq meas L3 filter coeff

‡Parameter ID: FilterCoef

‡Value range: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 17, 19

‡Content: This parameter specifies the intra-frequency measurement L3 filter coefficient. The greater this value is set, the greater the smoothing effect and the higher the anti-fast fading capability are, but the lower the signal change tracing capability is.

‡The default value of this parameter is 3

‡Set this parameter through SET INTRAFREQHO/ADD CELLINTRAFREQHO/MOD CELLINTRAFREQHO.

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A non-active PCPICH becomes better than an active PCPICH. This indicates that the quality or strength of a cell is close to the best cell.

In addition ,the number of cells in the active set has reached the maximum value. The cell replaces the worst cell in the active set ; thus achieving a higher combined gain

1C

RAN10.0 provides the solution to the issue of how to add an

HSUPA cell in a DCH active set to an E-DCH active set. Event 1J is added to the 3GPP protocol. This event is triggered when a non- active E-DCH but active DCH primary CPICH becomes better than an active E-DCH primary CPICH.

1J

Event of the change of the best cell 1D

The PCPICH quality or strength of the cells in the active set leaves the reporting range. This indicates that a cell is much worse than the quality of the best cell. The cell should not stay in the active set 1B

The PCPICH quality or strength of the cells in the monitored set enters the reporting range . This indicates that the cell is close to the best cell . A relative high combined gain can be achieved when the cell is added to the active set

1A

Description Event

Intra-Frequency Handover Measurement Events

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zEvent 1A is triggered on the basis of the following formula 1A EVENT

Intra-Frequency Handover Measurement

) 2 / (

) 1

( 1 1

1

a a

Best N

i

i New

New CIO W M W M R H

M

A ⎟⎟ ⎠ + − − −

⎜⎜ ⎞

⎝

≥ ⎛

+ ∑

=

‡ MNewis the measurement value of the cell in the reporting range.

‡ CIONewis equal to the sum of Cell oriented Cell Individual Offsetand Neighboring cell oriented CIO, which is the offset between the cell in the reporting range and the best cell in the active set.

‡ W represents Weighted factor, used to weight the quality of the active set.

‡ Mi is the measurement value of a cell in the active set.

‡ NAis the number of cells not forbidden to affect the reporting range in the active set.

‡ MBestis the measurement value of the best cell in the active set.

‡ R1ais the reporting range or the relative threshold of soft handover. The threshold parameters of the CS non-VP service, VP service, and PS service are as follows:

„ CS non VP service 1A event relative THD

„ VP service 1A event relative THD

„ PS service 1A event relative threshold

‡ H1a represents 1A hysteresis, the hysteresis value of event 1A.

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A: signal curve of the best cell in the active set B: signal curve of a cell in the monitoring set C: Th1Acurve

1A EVENT

Intra-Frequency Handover Measurement

z If the signal quality of a cell that is not in the active set is higher than Th1A for a period of time specified by 1A event trigger delay time(that is, Time to trigger in the figure), the UE reports event 1A

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Parameters of Intra-Frequency Handover

z CS non VP service 1A event relative THD

‡ Parameter ID: IntraRelThdFor1ACSNVP

‡ The default value of this parameter is 6 ( 3dB )

z VP service 1A event relative THD

‡ Parameter ID: IntraRelThdFor1ACSVP

‡ The default value of this parameter is 6 ( 3dB )

z PS service 1A event relative threshold

‡ Parameter ID: IntraRelThdFor1APS

‡ The default value of this parameter is 6 ( 3dB )

zCS non VP service 1A event relative THD

‡Parameter ID: IntraRelThdFor1ACSNVP

‡Value range: 0~14.5; step: 0.5

‡Content: This parameter specifies the relative threshold of event 1A for the CS non-VP service. The larger the parameter value is, the more easily event 1A is triggered..

‡The default value of this parameter is 6 (3dB)

‡Set this parameter through SET INTRAFREQHO/ADD CELLINTRAFREQHO/MOD CELLINTRAFREQHO.

zVP service 1A event relative THD

‡Parameter ID: IntraRelThdFor1ACSVP

‡Value range: 0~14.5; step: 0.5

‡Content: This parameter specifies the relative threshold of event 1A for the VP service.

The larger the parameter value is, the more easily event 1A is triggered..

‡The default value of this parameter is 6 (3dB)

‡Set this parameter through SET INTRAFREQHO/ADD CELLINTRAFREQHO/MOD CELLINTRAFREQHO.

zPS service 1A event relative THD

‡Parameter ID: IntraRelThdFor1APS

‡Value range: 0~14.5; step: 0.5

‡Content: This parameter specifies the PS service relative threshold of event 1A. The smaller the parameter value is, the more easily event 1A is triggered.

‡The default value of this parameter is 6 (3dB)

‡Set this parameter through SET INTRAFREQHO/ADD CELLINTRAFREQHO/MOD CELLINTRAFREQHO.

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z Cell oriented Cell Individual Offset

‡ Parameter ID: CIO

‡ The default value of this parameter is 0 (0dB )

z Neighboring cell oriented CIO

‡ Parameter ID: CIOOffset

‡ The default value of this parameter is 0 (0dB )

Parameters of Intra-Frequency Handover

zCell oriented Cell Individual Offset

‡Parameter ID: CIO

‡Value range: -10 to +10

‡Content: This parameter is used together with Neighboring cell oriented CIO. The sum of the two parameter values is added to the measurement quantity before the UE evaluates whether an event occurred. In handover algorithms, this parameter is used for moving the border of a cell.

‡The default value of this parameter is 0 ( 0dB )

‡Set this parameter through ADD CELLSETUP/MOD CELLSETUP

zNeighboring cell oriented CIO

‡Parameter ID: CIOOffset

‡Value range: -10 to +10

‡Content: This parameter is used together with Cell oriented Cell Individual Offset. The sum of the two parameter values is added to the measurement quantity before the UE evaluates whether an event has occurred. In handover algorithms, this parameter is used for moving the border of 2 neighbors.

‡The default value of this parameter is 0 ( 0dB )

‡Set this parameter through ADD INTRAFREQNCELL/MOD INTRAFREQNCELL

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z 1A hysteresis

‡ Parameter ID: Hystfor1A

‡ The default value of this parameter is 0 (0dB )

z 1A event trigger delay time

‡ Parameter ID: TrigTime1A

‡ The default value of this parameter is D320 ( 320ms )

z Weighted factor

‡ Parameter ID: Weight

‡ The default value of this parameter is 0

Parameters of Intra-Frequency Handover

z1A hysteresis

‡Parameter ID: Hystfor1A

‡Value range: 0~7.5; step: 0.5

‡Content: This parameter specifies the hysteresis value of event 1A. It is related to the slow fading characteristic.

‡The default value of this parameter is 0 (0dB)

‡Set this parameter through SET INTRAFREQHO/ADD CELLINTRAFREQHO/MOD CELLINTRAFREQHO.

z1A event trigger delay time

‡Parameter ID: TrigTime1A

‡Value range: 0, 10, 20, 40, 60, 80, 100, 120, 160, 200, 240, 320, 640, 1280, 2560, 5000 ms

‡Content: This parameter specifies the trigger delay time of event 1A. It is related to the slow fading characteristic. The greater the parameter value, the smaller the probability of misjudgment, but the slower the response of event reporting, triggered by measured signal changes.

‡The recommended value of this parameter is D320 ( 320ms )

‡Set this parameter through SET INTRAFREQHO/ADD CELLINTRAFREQHO/MOD CELLINTRAFREQHO.

zWeighted factor

‡Parameter ID: Weight

‡Value range: 0~20,step:0.1

‡Content: This parameter is used to define the soft handover relative threshold based on the measured value of each cell in the active set. The greater the parameter value, the higher the soft handover relative threshold. When this value is set to 0, the soft handover relative threshold is determined only by the best cell in the active set. .

‡The Default Value of this parameter is 0

‡Set this parameter through SET INTRAFREQHO/ADD CELLINTRAFREQHO/MOD

CELLINTRAFREQHO. 90

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Intra-Frequency Handover Measurement

z Event Trigger Report

z Event to Periodical Report

1A Event Report Mode:

The report mode of 1A is Event Trigger Report .

Generally the event 1A is reported only once. However, to avoid measurement report loss, the event 1A reporting can be turned to periodical reporting.

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z 1A event to periodical rpt period

‡ Parameter ID: ReportIntervalfor1A

‡ The default value of this parameter is D4000 (4000 ms )

z 1A event to periodical rpt number

‡ Parameter ID: PeriodMRReportNumfor1A

‡ The default value of this parameter is D16

Parameters of Intra-Frequency Handover

z1A event to periodical rpt period

‡Parameter ID: ReportIntervalfor1A

‡Value range: NON_PERIODIC_REPORT, D250, D500, D1000, D2000, D4000, D8000, D16000

‡Content: The reporting period for the event 1A. Generally the event 1A is reported only once. However, to avoid measurement report loss, the event 1A reporting can be turned to periodical reporting.

‡The default value of this parameter is D4000 (4000 ms)

‡Set this parameter through SET INTRAFREQHO/ADD CELLINTRAFREQHO/MOD CELLINTRAFREQHO.

z1A event to periodical rpt number

‡Parameter ID: PeriodMRReportNumfor1A

‡Value range: D1, D2, D4, D8, D16, D32, D64, infinity

‡Content: The periodical reporting times for the event 1A. When the actual times exceed this parameter, the periodical reporting comes to an end.

‡The recommended value of this parameter is D16

‡Set this parameter through SET INTRAFREQHO/ADD CELLINTRAFREQHO/MOD CELLINTRAFREQHO.

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zEvent 1B is triggered on the basis of the following formula 1B EVENT

), 2 / (

) 1

( 1 1

1

b b

Best N

i i Old

Old CIO W M W M R H

M

A ⎟⎟ + − − +

⎠

⎜⎜ ⎞

⎝

≤ ⎛

+ ∑

=

Intra-Frequency Handover Measurement

‡ MOld is the measurement value of the cell that becomes worse.

‡ CIOOld is equal to the sum of Cell oriented Cell Individual Offsetand Neighboring cell oriented CIO, which is the offset between the cell in the reporting range and the best cell in the active set.

‡ W represents Weighted factor, used to weight the quality of the active set.

‡ Mi is the measurement value of the cell in the active set.

‡ NA is the number of cells not forbidden to affect the reporting range in the active set. MBest is the measurement value of the best cell in the active set.

‡ R1b is the reporting range or the relative threshold of soft handover. The threshold parameters of the CS non-VP service, VP service, and PS services are as follows:

„ CS non VP service 1B event relative THD

„ VP service 1B event relative THD

„ PS service 1B event relative threshold

‡ H1b represents 1B hysteresis, the hysteresis value of event 1B.

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1B EVENT

A: signal curve of the best cell in the active set B: signal curve of a cell in the monitoring set C: Th1B curve

Intra-Frequency Handover Measurement

z If the signal quality of a cell in the active set is lower than Th1B curve for a period of time specified by 1B event trigger delay time(Time to trigger in the figure), the UE reports event 1B

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Parameters of Intra-Frequency Handover

z CS non VP service 1B event relative THD

‡ Parameter ID: IntraRelThdFor1BCSNVP

‡ The default value of this parameter is 12 ( 6dB )

z VP service 1B event relative THD

‡ Parameter ID: IntraRelThdFor1BCSVP

‡ The default value of this parameter is 12 ( 6dB )

z PS service 1B event relative threshold

‡ Parameter ID: IntraRelThdFor1BPS

‡ The default value of this parameter is 12 ( 6dB )

zCS non VP service 1B event relative THD

‡Parameter ID: IntraRelThdFor1BCSNVP

‡Value range: 0~14.5; step: 0.5

‡Content: This parameter specifies the relative threshold of event 1B for the CS non- VP service. The smaller the parameter value is, the more easily event 1B is triggered .

‡The default value of this parameter is 12 (6dB)

‡Set this parameter through SET INTRAFREQHO/ADD CELLINTRAFREQHO/MOD CELLINTRAFREQHO.

zVP service 1B event relative THD

‡Parameter ID: IntraRelThdFor1BCSVP

‡Value range: 0~14.5; step: 0.5

‡Content: This parameter specifies the relative threshold of event 1A for the VP service. The smaller the parameter value is, the more easily event 1B is triggered .

‡The default value of this parameter is 12 (6dB)

‡Set this parameter through SET INTRAFREQHO/ADD CELLINTRAFREQHO/MOD CELLINTRAFREQHO.

zPS service 1A event relative THD

‡Parameter ID: IntraRelThdFor1APS

‡Value range: 0~14.5; step: 0.5

‡Content: This parameter specifies the PS service relative threshold of event 1A. The smaller the parameter value is, the more easily event 1B is triggered .

‡The default value of this parameter is 12 (6dB)

‡Set this parameter through SET INTRAFREQHO/ADD CELLINTRAFREQHO/MOD CELLINTRAFREQHO.

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z 1B hysteresis

‡ Parameter ID: Hystfor1B

‡ The default value of this parameter is 0 (0dB )

z 1B event trigger delay time

‡ Parameter ID: TrigTime1B

‡ The default value of this parameter is D640 ( 640ms )

Parameters of Intra-Frequency Handover

z1B hysteresis

‡Parameter ID: Hystfor1B

‡Value range: 0~7.5; step: 0.5

‡Content: This parameter specifies the hysteresis value of event 1B. It is related to the slow fading characteristic.

‡The default value of this parameter is 0 (0dB)

‡Set this parameter through SET INTRAFREQHO/ADD CELLINTRAFREQHO/MOD CELLINTRAFREQHO.

z1B event trigger delay time

‡Parameter ID: TrigTime1B

‡Value range: 0, 10, 20, 40, 60, 80, 100, 120, 160, 200, 240, 320, 640, 1280, 2560, 5000 ms

‡Content: This parameter specifies the trigger delay time of event 1B. It is related to the slow fading characteristic. The greater the parameter value, the smaller the probability of misjudgment, but the slower the response of event reporting, triggered by measured signal changes.

‡The recommended value of this parameter is D640 ( 640ms )

‡Set this parameter through SET INTRAFREQHO/ADD CELLINTRAFREQHO/MOD CELLINTRAFREQHO.

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zEvent 1C is triggered on the basis of the following formula 1C EVENT

, 2

1 c /

InAS InAS

New

New CIO M CIO H

M + ≥ + +

Intra-Frequency Handover Measurement

‡ MNewis the measurement value of the cell in the reporting range.

‡ CIONewis the cell individual offset value of the cell in the reporting range. It is equal to the sum of Cell oriented Cell Individual Offsetand Neighboring cell oriented CIO, which is the offset between the cell in the reporting range and the best cell in the active set.

‡ MInASis the measurement value of the worst cell in the active set.

‡ CIOInASis the cell individual offset value of the worst cell in the active set. It is equal to the sum of Cell oriented Cell Individual Offsetand Neighboring cell oriented CIO.

‡ H1crepresents 1C hysteresis, the hysteresis value of event 1C.

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A: signal curve of the best cell in the active set B: signal curve of a cell in the active set C: signal curve of the worst cell in the active set D: signal curve of a cell in the monitoring set E: Th1C curve

1C EVENT

Intra-Frequency Handover Measurement

z If the signal quality of a cell not in the active set is higher than Th1Cfor a period of time specified by 1C event trigger delay time(Time to trigger in the figure), the UE

reports event 1C

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z 1C hysteresis

‡ Parameter ID: Hystfor1C

‡ The default value of this parameter is 8 (4dB )

z 1C event trigger delay time

‡ Parameter ID: TrigTime1C

‡ The default value of this parameter is D640 ( 640ms )

Parameters of Intra-Frequency Handover

z1C hysteresis

‡Parameter ID: Hystfor1C

‡Value range: 0~7.5; step: 0.5

‡Content: This parameter specifies the hysteresis value of event 1C. It is related to the slow fading characteristic.

‡The default value of this parameter is 8 (4dB)