03-wpo-17 wcdma urtan parameter introduction-89

WCDMA URTAN Parameter Introduction

ZTE University

Content

Cell Selection and Cell Re-selection Parameter

Paging Call and Connection Status Parameter

Handover Parameter

Power Control Parameter

FOR FDD cells ： Srxlev > 0 AND Squal > 0FOR TDD cells ： Srxlev > 0

Squal ＝ Qqualmeas － QqualminSrelev ＝ Qrxlevmeas － Qrxlevmin － Pcompensation

Standard of Cell-selection

Squal: cell-selection quality value (db) Srxlev ： cell-selection RX level value (db) Qqualmeas ： measured cell quality value, indicated by CPICH Ec/No Qrxlevmeas ： measured cell RX level value, indicated by CPICH RSCP (dbm) (FDD cell) Qqualmin ： minimum quality value necessary for cell (db) Qrxlevmin ： RX level (dbm) necessary for cell Pcompensation ： max(UE_TXPWR_MAX_RACH － P_MAX, 0) UE_TXPWR_MAX_RACH ： maximum TX power level used by UE when accessing cell upo

n RACH (dbm) P_MAX ： maximum RF output power of UE (dbm)

Note: In the above rule, UE takes Squal (FDD cell) and Srxlev (TDD cell) as Sx

Cell Re-selection Measurement Plan (not use HCS)

1. If Sx > Sintrasearch, UE may choose to not perform intra-frequency measurements. If Sx <= Sintrasearch, perform intra-frequency measurements.If Sintrasearch, is not sent for serving cell, perform intra-frequency measurements.

2. If Sx > Sintrasearch, UE may choose to not perform inter-frequency measurements. If Sx <= Sintrasearch, perform inter-frequency measurements.If Sintrasearch, is not sent for serving cell, perform inter-frequency measurements.

3. If Sx > SsearchRAT m, UE may choose to not perform measurements on cells of RAT "m". If Sx <= SsearchRAT m, perform measurements on cells of RAT "m".If SsearchRAT m, is not sent for serving cell, perform measurements on cells of RAT "m".

Rs ＝ Qmeas,s + Qhysts

Rn ＝ Qmeas,n － Qoffsets,n

Rs: R value of service cell Rn: R value of neighbor cell Qmeas: measurement value of cell signal. FDD cells use CPICH Ec/No or

CPICH RSCP Qoffset1s,n: offset of two cells used when FDD cells’ cell-selection and cell re-s

election measurement value is set to be CPICH RSCP. Qoffset2s,n: offset of two cells used when FDD cells’ cell-selection and cell re-s

election measurement value is set to be CPICH Ec/No. Qhyst1s: hysteresis value used when FDD cells’ cell-selection and cell re-selecti

on measurement value is set to be CPICH RSCP. Qhyst2s: hysteresis value used when FDD cells’ cell-selection and cell re-selecti

on measurement value is set to be CPICH Ec/No. Treselection: Timer value of cell re-selection.

Standard R value of cell queue:

UE queues all the cells meeting the S standard according to R value. The best cell has the highest R value;

Within the time interval of Treselection, if all the new cell queue levels are above service cell queue levels, a

nd UE has stayed in current service cell more than 1s, UE will re-select the new cell.

Standard and Parameter of Cell Re-selection

Cell Selection and Re-selection Quality Measure

Parameter Name Cell Selection and Re-selection Quality Measurement Value

Refers to TS 25.304

Parameter

Description

This parameter indicates cell selection and re-selection

quality measurement value

Location in NE Cell

Value Range 1: CPICH Ec/No; 2: CPICH RSCP

Default Value 1

Suggestive Value 1

Description for

setting and adjusting

Because of the feature of self-scrambling in UMTS system,

scrambling exists in network generally. Taking pilot

frequency signal quality as the standard value of cell

selection/re-selection in the system can apply better service

to customer.

Minimum Required Quality Level in CellParameter Name Qqualmin (Minimum Required Quality Level in the Cell)

Refers to TS 25.304

Parameter Description This parameter indicates minimum required quality level in the cell for meeting cell selection/re-selection. If measurement value is CPICH Ec/No, only quality value of tested cell being bigger than Qqualmin can meet the condition of cell selection.

Location in NE Cell

Value Range (-24..0)dB step 1dB

Default Value -18dB

Suggestive Value -18dB

Description for setting and adjusting

For scene of highway, because of the long distance between base stations, few cells in number, high-span between cells and fast movement of UE, UE cannot re-select cell in time when the old cell signal becomes poor and entering new cell area. On this kind of situation, through reducing Qqualmin and Qrxlevmin properly, UE can complete cell re-selection as soon as possible. This is also suitable for corner scene of dense areas.

Attentions N/A

Minimum RX Level Threshold of Cell

Parameter Name Qrxlevmin (Minimum RX Level in the Cell)

Refers to TS 25.304

Parameter

Description

This parameter indicates minimum required RX level in the c

ell. If measurement value is CPICH RSCP, only RX level of t

ested cell being bigger than Qrxlevmin can meet the conditio

n of cell selection.

Location in NE Cell

Value Range (-115..-25)dBm step 2dBm

Default Value -115dBm

Suggestive Value -115dBm

Description for setting

and adjusting

The same as Qqualmin

Attentions N/A

Intra Frequency Measurements Threshold of Cell Re-selectionParameter Name Sintrasearch (Intra Frequency Measurements Threshold of Cell Re-selection)

Refers to TS 25.304

Parameter Description This parameter indicates the threshold for intra frequency measurements of cell re-selection.

It can be used by UE to decide to perform intra frequency measurements or not. When HCS i

s not used, if serving cell quality is bigger than Sintrasearch, UE may choose to not perform

intra-frequency measurements. If serving cell quality is smaller than Sintrasearch or Sintrasea

rch is not sent for serving cell, UE performs intra-frequency measurements.

Location in NE Cell

Value Range (0..20 )dB Step 2dB

Default Value 14dB

Suggestive Value 14dB

Description for setting and

adjusting

The larger Sintrasearch is, the faster intra frequency starts. For scene of highway, because of

the long distance between base stations, few cells in number, high-span between cells and fa

st movement of UE, UE cannot re-select cell in time when the old cell signal becomes poor an

d entering new cell area. On this kind of situation, through increasing Sintrasearch properly, U

E can complete cell re-selection as soon as possible. This is also suitable for corner scene of

dense areas.

Attentions Sintrasearch is only valid when SintraSearchPre is True.

Inter Frequency Measurements Threshold of Cell Re-selection

Parameter Name Sintersearch (Inter Frequency Measurements Threshold of Cell Re-selection)

Refers to TS 25.304

Parameter Description This parameter indicates the inter frequency measurements threshold of cell re-

selection, Sintersearch. It can be used by UE to decide to perform inter

frequency measurements or not. When HCS is not used, if serving cell quality is

bigger than Sintersearch, UE may choose to not perform inter-frequency

measurements. If serving cell quality is smaller than Sintersearch or Sintersearc

h is not sent for serving cell, UE performs inter-frequency measurements.

Location in NE Cell


Default Value 10dB



adjusting

The same as Sintrasearch

Attentions Sintersearch is only valid when SinterSearchPre is True.

Inter-RAT Measurements Threshold of Cell Re-selectionParameter Name Ssearch,RAT (Inter-RAT measurements threshold of cell re-selection)

Refers to TS 25.304

Parameter Description This parameter indicates the inter-RAT measurements threshold of cell re-

selection, Ssearch,RAT. It can be used by UE to decide to perform inter-

RAT measurements or not. When HCS is not used, if serving cell quality is

bigger than Ssearch,RAT, UE may choose to not perform inter-RAT

measurements. If serving cell quality is smaller than Ssearch,RAT or Ssear

ch,RAT is not sent for serving cell, UE performs inter-RAT measurements.

Location in NE Cell


Default Value 2dB



adjusting

The same as Qrxlevmin in SIB11

Attentions Ssearch,RAT is only valid when OtherRATInfoPre is True.

Hysteresis Value1 of Serving Cell Re-selection

Parameter Name Qhyst1s (Hysteresis Value1 of Serving Cell Re-selection)

Refers to TS 25.304

Parameter Description

This parameter indicates the hysteresis value. It is used for FDD cells in case the quality measure for cell selection and re-selection is set to CPICH RSCP. In the R rule of cell re-selection sorting, R value of serving cell is equal to measurement value plus re-selection hysteresis value.

Location in NE Cell

Value Range (0..40)dB step2 dB

Default Value 2dB



For dense area ， because of the short distance between base stations, many cells in number and mixed and disorderly cells, cell re-selection occurs very frequently. To avoid frequent re-selection, we can increase the hysteresis value to harden re-selection.

Attentions N/A

Hysteresis Value2 of Serving Cell Re-selection

Parameter Name Qhyst2s (Hysteresis Value2 of Serving Cell Re-selection)

Refers to TS 25.304

Parameter Description This parameter indicates the hysteresis value. It is used for FDD cells in case the quality measure for cell selection and re-selection is set to CPICH Ec/No. In the R rule of cell re-selection sorting, R value of serving cell is equal to measurement value plus re-selection hysteresis value.

Location in NE Cell

Value Range (0..40)dB step2 dB

Default Value 2dB



The same as Qhyst1s

Attentions N/A

Minimum Required RX Level in the Cell in SIB11

Parameter Name Qrxlevmin in SIB11 (Minimum Required RX Level in the Cell in SIB11)

Refers to TS 25.331


This parameter indicates the minimum required RX level when UE is stationed in a certain cell. If the measurement value is CPICH RSCP, only the quality value of tested cell, Qrxlevmeas, being bigger than Qrxlevmin can meet the cell re-selection requirement. This is the Qrxlevmin value of SIB11.

Location in NE Cell

Value Range (-115..-25)dBm step 2 dBm

Default Value -115dBm

Suggestive Value -97dBm


For the network of WCDMA together with GSM, the coverage inside WCDMA is expected to be continuous. Cell selection and re-selection from WCDMA to GSM are only needed on the edge of WCDMA network coverage area. So in the dense region, we can increase Qrxlevmin in SIB11 and Qoffset1-s,n in SIB11 (neighbor) to harden cell re-selection. On the edge of WCDMA network, especially on the highway, the signal of WCDMA cell fades fast when UE moves fast. UE cannot re-select cell in time when entering GSM network. So increasing Ssearch,RAT, decreasing Qrxlevmin in SIB11 and Qoffset1-s,n in SIB11 (neighbor) can help UE to complete re-selection as soon as possible.

Offset1 between Serving Cell and Neighbor Cell in SIB11

Parameter Name Qoffset1s,n in SIB11 (Offset1 Between Serving Cell and Neighbor Cell in SIB11)

Refers to TS 25.331


This parameter indicates the offset between the two cells, serving cell and neighbour cell, in case the quality measure for cell selection and re-selection is set to CPICH RSCP. It is the necessary parameter used for cell sorting in the rule of cell re-selection. This parameter is broadcasted to UE in S1B11.

Location in NE Cell

Value Range (-50..50)dB

Default Value 0dB



This parameter is mainly used for inter-RAT re-selection. The larger the parameter is, the less re-selection happens.

Attentions N/A

Offset2 between Serving Cell and Neighbor Cell in SIB11

Parameter Name

Qoffset2s,n in SIB11 (Offset2 between Serving Cell and Neighbor Cell in SIB11)

Refers to TS 25.331


This parameter indicates the offset between the two cells, serving cell and neighbour cell, in case the quality measure for cell selection and re-selection is set to CPICH Ec/No. It is the necessary parameter used for cell sorting in the rule of cell re-selection. This parameter is broadcasted to UE in S1B11.

Location in NE Cell

Value Range (-50..50)dB

Default Value 0dB

Suggestive Value

0dB


This parameter is mainly used for inter-RAT re-selection. The larger the parameter is, the less re-selection happens.

Attentions N/A

Cell Reselection Timer ValueParameter Name

Treselections (Cell Re-selection Timer Value)

Refers to TS 25.304


This parameter indicates the cell re-selection timer value. As a serving cell, according to R rule of sorting, new cell must be the best one and keep the state for a period of Treselections at first. And then it can be selected as new serving cell.

Location in NE Cell

Value Range (0..31)s step 1s

Default Value 1s

Suggestive Value

1s


For the scene of dense and frequent changing cell signal, increasing timer value can increase the degree of difficulty of cell re-selection. This can avoid frequently re-selecting. For the scene of highway, the value of Treselections can be decreased properly.

Attentions N/A

Content



Handover Parameter


AICH Power Offset

Parameter Name

AICH Power Offset


Power offset between AICH emissive power and pilot frequency channel power.

Value Range [-22..5] dB

Suggestive Value

-7dB


AICH emissive power is the power offset relative to pilot frequency channel power. The emissive power of pilot frequency channel usually has relationship with scene. However, AICH power offset has no relationship with scene. According to testing result, call success rate on the edge of cell is more satisfied when AICH is equal to -7dB and PICH is equal to -7dB.

Attentions N/A

PRACH Preamble Power Ramp Step

Parameter Name

Power Ramp Step


This parameter indicates the power ramp step which should be added to previous power when UE sends a prefix and not receives any response from AICH. UE sends the next prefix with this power.

Value Range [1..8] dB

Suggestive Value

1dB


After Preamble Retrans Max times attempts, UE preamble power can be increased to 40dB by increasing PRACH preamble power with smallest particle size. According to testing, this can meet the requirement on the edge of cell.

Attentions N/A

Maximum Number of Preambles in One Preamble Ramping Cycle

Parameter Name Preamble Retrans Max


This parameter indicates the max number of preamble in one preamble ramping cycle.


Suggestive Value

40dB


It is considered to apply more chance to physical layer and avoid physical layer accessing failure. This can improve accessing probability and user feelings.

Attentions N/A

Maximum Number of Cycles in One Preamble Ramping Cycle

Parameter Name

Mmax


Maximum number of cycles in one preamble ramping cycle


Suggestive Value

6dB


The bigger the value is, the more retrying chance the MAC level has. But if it is too big, the user feelings will become worse. So the suggestive value is 6.

Attentions N/A

PRACH Initial Power Constant Value

Parameter Name

Constant Value


This parameter is used to calculate PRACH initial emissive power.

Value Range [-35..-10] dB

Suggestive Value

Single antenna - 18dB; Double antenna - 21dB.


Single antenna - 18dB; Double antenna - 21dB. It can make the preamble sent on the edge of cell be demodulated by NodeB.

Attentions N/A

Power Offset Pp-m

Parameter Name

Power Offset Pp-m


This parameter indicates the offset of message of PRACH relative to preamble.

Value Range [-5..10] dB

Suggestive Value

2dB


Bigger offset can improve demodulation quality of message.

Attentions N/A

T300 Parameter Name

T300 Timer


This parameter indicates the waiting time after UE sends RRC CONNECTION SETUP REQUEST message (waiting for RRC Connection Setup message)

Value Range (100, 200, 400, 600, 800, 1000, 1200, 1400, 1600, 1800, 2000, 3000, 4000, 6000, 8000)ms

Suggestive Value

2000ms


Setting this timer too short will make UE send useless RPC connection request again and again. This will increase the load of random access and decrease the uplink capacity. And setting this timer too long doesn’t facilitate RPC to access again when network really doesn’t receive the RPC connection request.

Attentions N/A

N300Parameter Name

N300


This parameter indicates the maximum resending count of RRC CONNECTION SETUP REQUEST message.

Value Range （ 0..7 ）Suggestive Value

3


Setting this parameter to 3 can improve the success rate of RPC connection establishment. However, it is not necessary to set the value of this parameter too big. The common waiting time user can tolerate is about 10s. So for RPC connection establishment trying time, 6s is a properly value.

Attentions N/A

CN DRX Cycle Length Coefficient

Parameter Name

CN DRX Cycle Length Coefficient (SIB1)


This parameter indicates the coefficient for calculating paging interval.

Value Range [6..9]

Suggestive Value

6


The value of this parameter decides the paging cycle of CS and PS service. The bigger the value is, the longer the paging cycle is. And the reflecting time from the user to network also becomes longer. So we usually set this parameter’s value as the minimum value in the protocol (6 means the paging cycle is 640ms)

Attentions N/A

UTRAN DRX Cycle Length Coefficient

Parameter Name UTRAN DRX Cycle Length Coefficient


This parameter indicates the coefficient of UE DRX on the connecting state.

Value Range [3..9]

Suggestive Value 6


This parameter indicates the coefficient of UE DRX on the connecting state. It is used to calculate the const value for paging time (cycle of listening PICH) . DRX cycle is 2^k frames.

If UE is on the connecting state, UE will choose the minimum value of two parameters as k. These two parameters are UTRAN DRX cycle length coefficient and CN domain specific DRX cycle length coefficient in the area which UE attaches on. The bigger the value is, the longer UE listens paging channel cycle is. Besides, the reflection of UE to network will become slower.

This parameter is only used on the state of CELL_PCH/URA_PCH. It is invalid without the state of CELL_PCH/URA_PCH.

Attentions N/A

PICH Power Offset

Parameter Name

PICH Power Offset


This parameter indicates PICH power offset.

Value Range （ -10..5 ） dB

Suggestive Value

-7dB


PICH emissive power is the power offset relative to pilot frequency channel power. The emissive power of pilot frequency channel usually has relationship with scene. However, PICH power offset has no relationship with scene. According to testing result, call success rate on the edge of cell is more satisfied when AICH is equal to -7dB and PICH is equal to -7dB.

Attentions N/A

Number of Paging Indicators per PICH FrameParameter Name

Number of PI per Frame (Np) （ SIB5 ）


This parameter indicates the number of PI per PICH frame.

Value Range Integer (18, 36, 72, 144) times

Suggestive Value

18


Current configuration already can guarantee 1800 PI/s for each LAC and meet the network requirement.

The bigger NP configuration is, the less each PI repeats. Besides, the power needed is more. So in order to save power, this parameter should be set as the minimum value under the condition of meeting paging requirement.

Attentions N/A

T312 Timer

Parameter Name

T312 Timer


This parameter indicates the time of UE waiting synchronizing indicator of L1 after special physical channel establishment.

Value Range (0..15) s

Suggestive Value

1 s


To Shorten the configuration time can make UE entering the synchronization state and decrease the calling delay.

Attentions N/A

N312 ConstantParameter Name

N312 Constant


This parameter indicates the synchronizing indicator counts UE should receive from L1 continuously before special physical channel being set up successfully.

Value Range OMCR ：（ 1 ， 2 ， 4 ， 10 ， 20 ， 50 ， 100 ， 200 ， 400 ， 600 ， 800 ， 1000 ） RNC ：（ 0 ， 11 ） s

Suggestive Value

1


Make UE with connecting state entering synchronization state as soon as possible.

Attentions N/A

T313 Timer

Parameter Name

T313 Timer


This parameter indicates the waiting time DPCCH with CELL_DCH state having been set up is out of sync.

Value Range （ 0..15 ） s

Suggestive Value

3 s


In order to guarantee user’s service quality, it should trigger call re-establishment as soon as possible when the quality of channel is poor.

Attentions N/A

N313 Constant

Parameter Name N313 Constant


This parameter indicates the maximum number of successive "out of sync" received from L1.

Value Range OMCR ：（ 1 ， 2 ， 4 ， 10 ， 20 ， 50 ， 100 ， 200 ）RNC ：［ 0 ， 7 ］

Suggestive Value Default Value ： 20


Suggestive value: N313= 50, T313=3S. With this configuration, the time of UE reporting radio link failure is 11s (50*0.16 + 3). This configuration can meet the scene of getting in and out elevator and avoid dropped call when getting in and out elevator. At the same time, it give the user a chance for call re-establishment within the tolerable waiting time and decrease dropped call rate.

Attentions N/A

T314 Timer

Parameter Name

T314 Timer


When the criteria for radio link failure are fulfilled.The timer is started if radio bearer(s) that are associated with T314 exist or if only RRC connection exists only to the CS domain.

Value Range OMCR ：（ 0 ， 2 ， 4 ， 6 ， 8 ， 12 ， 16 ， 20 ） s

RNC ：［ 0 ， 7 ］Suggestive Value

4 s


For CS services, the user tolerable waiting time is short, so this parameter should be set to a shorter value.

Attentions N/A

T315 Timer

Parameter Name

T315 Timer


When the criteria for radio link failure are fulfilled. The timer is started only if radio bearer(s) that are associated with T315 exist or if RRC connection exists to PS domain.

Value Range OMCR ：（ 0 ， 10 ， 30 ， 60 ， 180 ， 600 ， 1200 ， 1800 ） s

RNC ：［ 0 ， 7 ］Suggestive Value

30 s


For PS services, user is not sensitive to network delay. So the value of this parameter can be set to a bigger one to decrease dropped call rate.

Attentions N/A

N315 Constant

Parameter Name

N315 Constant


This parameter indicates the maximum number of successive "in sync" received from L1 during T313 is activated.

Value Range OMCR ：（ 1 ， 2 ， 4 ， 10 ， 20 ， 50 ， 100 ， 200 ， 400 ， 600 ， 800 ， 1000 ）RNC ：［ 0 ， 11 ］

Suggestive Value

1


This parameter is used to make UE entering sync state and decrease dropped call rate.

Attentions N/A

T302 Timer

Parameter Name

T302 Timer


This parameter indicates the waiting time after UE sending CELL/URA UPDATE message. The unit is ms.

Value Range OMCR ：（ 100 ， 200 ， 400 ， 600 ， 800 ， 1000 ， 1200 ， 1400 ， 1600 ， 1800 ， 2000 ， 3000 ， 4000 ， 6000 ， 8000 ）ms

RNC ：（ 0 ， 14 ）Suggestive Value

1000 ms


This parameter is used to avoid UE sending useless CELL/URA UPDATE connecting requests repeatedly and make UE sending cell update soon.

Attentions N/A

N302 Constant

Parameter Name

N302 Constant


This parameter indicates the maximum number of retransmissions of the CELL UPDATE / URA UPDATE message.

Value Range （ 0..7 ）Suggestive Value

2


Too much CELL/URA UPDATE doesn’t increase success rate obviously. But it can make user stay at the abnormal state too much time.

Attentions N/A

Content



Handover Parameter


Classification of Frequently-used Handover EventsCategory Exent Description

Intra-frequency handover

1A CELL enters report range

1B CELL departs from report range

1C The quality of a non-activated set cell is better than that of a certain activated set cell

1D Best cell generates change

1E Quality of target cell improves, better than an absolute threshold

1F Quality of target cell decreases, worse than an absolute threshold

Inter-frequency handover

2A Change of best frequency. There is quality of not current best frequency better than current best frequency.

2B The estimated quality of a non-used frequency is above a certain threshold & the estimated quality of the currently used frequency is below a certain threshold

2C The estimated quality of a non-used frequency is above a certain threshold

2D The estimated quality of the currently used frequency is below a certain threshold

2E The estimated quality of a non-used frequency is below a certain threshold

2F The estimated quality of the currently used frequency is above a certain threshold

Other system handover

3A the quality of the UTRAN carrier currently in use is lower than while the assessed quality of other systems is higher than the predefined threshold

3B The estimated quality of other system is below a certain threshold

3C The estimated quality of other system is above a certain threshold

3D The best cell of other system update

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Event 1A Algorithm and Handover Principle

Reporting event 1A is used to add cell into active set when a primary CPICH enters report range. MS sends measurement report when a primary CPICH enters the report range defined below:

Event 1A Algorithm and Handover Principle

The variables in the formula are defined as follows: MNew is the measurement result of the cell entering the reporting range. Mi is a measurement result of a cell not forbidden to affect reporting range in

the active set. NA is the number of cells not forbidden to affect reporting range in the current

active set. MBest is the measurement result of the cell in the active set with the highest

measurement result. W is a parameter sent from RNC to MS. R1a is the reporting range constant sent from RNC to MS. H1a is the hysteresis parameter for the event 1a.

Other parameters: Reporting deactivation threshold: the maximum number of cells which are

allowed in active set. Time to trigger: the period of time during which the event occurs, before sendin

g event report. Amount of reporting: periodic reporting count when event 1A triggered. Reporting interval: reporting interval of periodic reporting count when event 1A

triggered.

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Event 1B Algorithm and Handover Principle

Reporting event 1B is used to delete cell from active set when a primary CPICH leaves report range.

MS sends measurement report when a primary CPICH leaves the report range defined below:

Event 1B Algorithm and Handover Principle

The variables in the formula are defined as follows: MOld is the measurement result of the cell leaving the

reporting range. Mi is a measurement result of a cell in the active set. NA is the number of cells in the current active set. MBest is the measurement result of the cell in the

active set with the highest measurement result W is a parameter sent from RNC to MS. R1b is the reporting range constant sent from RNC to

MS. H1b is the hysteresis parameter for the event 1b.

Other parameters: Time to trigger: the period of time during which the ev

ent occurs, before sending event report.

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Event 1C Algorithm and Handover Principle

A non-active primary CPICH becomes better than an active primary CPICH. Reporting event 1C is used to replace the cell in active set.

Event 1C Algorithm and Handover Principle

The variables in the formula are defined as follows: MNew is the measurement result of the cell entering the

reporting range. MInAS is the measurement result of the cell in the active

set. H1c is the hysteresis parameter for the event 1c.

Other parameters: Replacement activation threshold: the minimum number of

cells which are allowed in active set Time to trigger: the period of time during which the event oc

curs, before sending event report. Amount of reporting: periodic reporting count when event 1

C triggered. Reporting interval: reporting interval of periodic reporting co

unt when event 1C triggered

UE Measurement Reporting Algorithm – Cell individual offsets

For each cell that is monitored, an offset can be assigned with inband signalling. The offset can be either positive or negative. The offset is added to the measurement quantity before the MS evaluates if an event has occurred.

Offset of neighbor cell parameter, CPICH Ec/No, can be set as the offset which MS pluses it to neighbor cell measurement result, CPICH Ec/No, before compares it with reporting principle value, Ec/No.

Cell individual offsets can be regarded as the tool of moving cell edge.

Soft Handover Algorithm

Pilot Ec/Io of cell 1

time

PilotEc/Io

Connect to cell1 Event 1A Event 1C Event 1B = add cell2 = replace cell1 with cell 3 = remove cell3



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Summary of Key Parameters of Soft Handover

Reporting Range Constant The threshold range of triggering soft handover event

reporting.

Hysteresis The hysteresis value used for event judgment.

Time to trigger The period of time during which the event occurs, before

sending event report.

Amount of reporting Periodic reporting count when event triggered.

Reporting Interval Reporting interval of periodic reporting count when event

triggered

2/3G Handover Parameter - 2D

2D Event: Start inter-frequency measurement threshold

2/22 ddUsedUsed HTQ

2/22 ffUsedUsed HTQ

Qused: currently used signal quality.

Tused 2d: the absolute threshold of current signal

H2d: the hysteresis parameter for the event 2d.

2D Event: Close inter-frequency measurement threshold

Qused: the same as above

Tused 2f: the absolute threshold of current signal

H2f: the hysteresis parameter for the event 2f.

2/3G Handover Parameter - 3A

Inter-RAC handover threshold: 2/3aUsedUsed HTQ

2/3aRATOtherRATOtherRATOther HTCIOM

QUsed: the quality of currently used signal TUsed: the set of absolute threshold of current signal MOther RAT: the measurement quantity for the cell of

the other system. CIOOther RAT: the cell individual offset for the cell of

the other system. TOther RAT: the set of absolute threshold of other system H3a: the hysteresis parameter for event 3a.

Intra-frequency Measurement Filter Coefficient

Parameter Name

Filter Coefficient (Intra-frequency Measurement Filter Coefficient)

Refers to TS 25.331


This parameter indicates the filter coefficient used by UE to complete L3 filtering during intra-frequency measurement. On the UE side, L1 performs intra-frequency measurement with fixed period (During one period of measurement, multiple point will be measured. And L1 will filtering the result of measurement. The filtering method can be decided by UE self). And then L1 sends the report to L3 according to a certain time interval. L3 filters the measurement results of this time and the results saved before. The filtering method is decided by protocol. Fn is the measurement result filtered this time, Fn-1 is the measurement result filtered last time and Mn is the newest measurement value. The formula is: , a = 1/2(k/2 ） . K is the filter coefficient. K set to be 0 means L3 is unnecessary.

Location in NE RNC

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

Default Value Refer to parameter table

Suggestive Value

UE event reporting parameter with measurement value, Ec/No, is 2.


The smaller the filter coefficient is, the greater the measurement result of this time affects the measurement result reported to RNC (periodic report) at last or used for decision (event report).

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Intra-frequency Measurement Quantity

Parameter Name MeasQuantity (Intra-frequency Measurement Quantity)

Refers to TS 25.331


This parameter indicates the intra-frequency measurement quantity when UE does intra-frequency measurement.

Location in NE RNC

Value Range 0: CPICH Ec/No, 1: CPICH RSCP, 2: path loss


Suggestive Value

UE event report parameter with measurement value of Ec/No: CPICH Ec/No


N/A

Reporting Range Constant for Event 1A/1B Which satisfies event quality criteria

Parameter Name Reporting Range Constant for Event 1A/1B (Reporting Range Constant for Event 1A/1B Which satisfies event quality criteria)

Refers to TS 25.331


This parameter controls the triggering of 1a/1b event. The bigger the parameter value is, the easier the 1a event is triggered and the more difficult the 1b event is triggered. On the contrary, the smaller the parameter is, the more difficult the 1a event is triggered and the easier the 1b event is triggered.

Location in NE RNC

Value Range (0..14.5)dB step 0.5dB


Suggestive Value 1A 3dB, 1b 5dB


In dense region, soft handover happens very frequently during the movement of UE because there are many cells and the cells overlaps a lot. This not only affects the network quality, but also occupied a lot of network resources. So increasing 1A triggering time and decreasing 1A triggering threshold, decreasing 1B triggering time and increasing 1B triggering threshold can decrease soft handover. At the same time, for the region with tremendous signal changes, such as street corner, 1A and 1B triggering time and threshold should be adjusted towards the negative direction. This can make 1A happen as early as possible and 1B happen as late as possible and guarantees the handover completed smoothly.

Attentions Only valid for event reporting style and 1A/1B event.

Weight for Event 1A/1B Quality Decision

Parameter Name Weight for Event 1A/1B (Weight for event 1A/1B quality

decision)

Refers to TS 25.331

Parameter

Description

This parameter is used for event 1A/1B quality decision. It

indicates the weight of quality decision for the cell with

best signal. It has relationship with measurement value

and event category.

Location in NE RNC

Value Range (0.0..2.0) step 0.1


Suggestive Value 0

Description for setting

and adjusting

N/A


Hysteresis Range for Decision

Parameter Name

Hysteresis (Hysteresis range for decision)

Refers to TS 25.331


This parameter indicates the hysteresis when judging whether the event can satisfy the event triggering condition. Using this parameter can bring the time duration between starting a certain event and leaving it. This can avoid triggering state changing with any little change. It has relationship with measurement value and event category.

Location in NE

RNC

Value Range (0..7.5)dB step 0.5dB


Suggestive Value

1A 0 dB, 1B 0 dB, 1C/1D 4 dB, 2D/2F 4dB, 3A 4dB


The bigger the hysteresis is, the longer between starting a certain event and leaving it.


Time to Trigger

Parameter Name

Time to Trigger (Monitored time interval between the happening and reporting of event)

Refers to TS 25.331


This parameter indicates the monitored time interval between the happening and reporting of event. Event is only triggered when it is monitored and keep meeting event triggering condition during the triggering time indicated by this parameter.

Location in NE RNC

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


Suggestive Value

1A 320ms, 1B 1280ms, 1C /1D 320ms, 2D /2F 640ms, 3A 640ms


The bigger this parameter is set, the stricter the decision for event triggering is. However, we should set the value of this parameter according to the need because sometimes setting this value too big may decrease user’s communication quality.

Attentions Only valid for event reporting style.

Amount of Periodic Reporting for Event 1a/1b/1c

Parameter Name

Amount of Reporting for Event 1A/1B/1C (Amount of Periodic Reporting for Event 1a/1b/1c)

Refers to TS 25.331


This parameter indicates the maximum amount of measurement reporting after triggering event 1a/1b/1c. After event 1a/1b/1c triggering, UE reports measurement results according to reporting time interval. If amount of reporting is beyond the value indicated by this parameter, UE will stops reporting measurement results. If the decision indicates that UE has already left the event 1a/1b/1c, it will stops reporting measurement results even if the amount of reporting is not beyond the value indicated by this parameter.

Location in NE RNC

Value Range (1, 2, 4, 8, 16, 32, 64, Infinity)


Suggestive Value

2


N/A

Attentions Only valid for event reporting style and corresponding event.

Reporting Interval for Triggering Event 1A/1B/1C

Parameter Name

Reporting Interval for Event 1A/1B/1C (Report interval for triggering event 1A/1B/1C)

Refers to TS 25.331


This parameter indicates the interval of periodic measurement reporting after event 1A/1B/1C is triggered. After event 1A/1B/1C is triggered, UE reports measurement results according to reporting interval. If amount of reporting is beyond the value indicated by this parameter, UE will stops reporting measurement results. If the decision indicates that UE has already left the event 1a/1b/1c, it will stops reporting measurement results even if the amount of reporting is not beyond the value indicated by this parameter.

Location in NE RNC

Value Range (0, 250, 500, 1000, 2000, 4000, 8000, 16000)ms


Suggestive Value

1A /1C 2000ms


N/A


Absolute Threshold of the Quality of the Currently Used Frequency for 2B/2D/2F

Parameter Name Absolute Threshold of the Quality of the Currently Used Frequency for 2B/2D/2F

Refers to TS 25.331


This parameter indicates the absolute threshold of event 2B/2D/2F (for deciding the currently used frequency )

Location in NE RNC

Value Range Refer to parameter table


Suggestive Value

2D -95dBm, 2F -90dBm


In dense region, in order to avoid unnecessary inter-RAT handover to increase system load, we should try to guarantee the continuous coverage of 3G. However, for the scene of 3G edge and highway, UE should handover from 3G to 2G as soon as possible before the attenuation of 3G signal. This needs to increase the triggering threshold of 2D and decrease triggering time and hysteresis in order to make UE starting compressed mode.

Attentions ThreshUsedFreq is valid only when RptCrt is equal to 2 (inter-frequency reporting) and MeaEvtId is equal to 2b/2d/2f. At the same time, the following restriction must be fulfilled: The value range of ThreshUsedFreq is (-115..-25 ) dB when MeasQuantity is equal to CPICH RSCP;The value range of ThreshUsedFreq is (-24..0) dB when MeasQuantity is equal to CPICH Ec/No.

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

Parameter Name

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

Refers to TS 25.331


This parameter indicates the absolute threshold of other RAT for event 3A/3B/3C. The value range and unit of this parameter has relationship with cell measurement value in other RAT.

Location in NE RNC

Value Range Refer to parameter table


Suggestive Value

3A -100dBm


For the scene of 3G edge and highway, UE should handover from 3G to 2G as soon as possible before the attenuation of 3G signal. This needs to decrease the absolute threshold of the quality of other RAT and make UE starting compressed mode at the same time in order to complete handover as soon as possible.


Content



Handover Parameter


Types of Power Control

Open Loop

Estimate initial transmitted power of channel according to channel condition

Open Loop

Estimate initial transmitted power of channel according to channel condition

Closed Loop - Inner Loop

Compare measurement SNR with target SNR and send commands to MS to adjust its transmitted power.

The controlled frequency of WCDMA closed loop power is 1500Hz Decrease MS transmitted power if SIR > target SIRIncrease MS transmitted power if SIR < target SIR

Closed Loop - Inner Loop

Compare measurement SNR with target SNR and send commands to MS to adjust its transmitted power.

The controlled frequency of WCDMA closed loop power is 1500Hz Decrease MS transmitted power if SIR > target SIRIncrease MS transmitted power if SIR < target SIR

Closed Loop – Outer Loop

Measure frame error rate and adjust target SNR

Closed Loop – Outer Loop

Measure frame error rate and adjust target SNR

Open Loop Power Control of Uplink Public Channel (PRACH)

The formula of initial transmitted power of PRACH (PCPCH) is: Preamble_Initial_Power = Primary CPICH DL TX power – CPICH_RSCP + U

L interference + Constant Value

m-p PStep RampPower ernitial_PowPreamble_IwerPRACH_C_Po

The method of power control of PRAC

H: If UE sends prefix and not receives re

sponse from NODEB within the prescr

ibed time, UE will add one Power_Ste

p to the transmitted power of the last

prefix when it sends the next prefix. If UE sends prefix and receives respo

nse from NODEB within the prescribe

d time, for PRACH, UE will send the

message with adding the power offset

between the parts of message and pr

efix to the original power.

Message part Preamble

4096 chips 10 ms (one radio frame)

Preamble Preamble

Message part Preamble

4096 chips 20 ms (two radio frames)

Preamble Preamble

Data Ndata bits

Slot #0 Slot #1 Slot #i Slot #14

Tslot = 2560 chips, 10 bits

Data

Control

Tslot = 2560 chips, Ndata = 10*2k bits (k=0..3)

Pilot Npilot bits

TFCI NTFCI bits

Message part radio frame TRACH = 10 ms

Physical Random Access Channel (PRACH)

Open Loop Power Control of Uplink Dedicated Channel (DPCCH/DPDCH)

The main function of uplink dedicated channel (DPCCH/DPDCH) open loop power control:

Confirm the initial transmitted power of DPCCH. Confirm the gain factor c and d of uplink control physical chann

el and uplink data physical channel. The formula for calculating the initial transmitted power of DPCCH is:

DPCCH_Initial_power = DPCCH_Power_offset - CPICH_RSCP The variables in the formula are defined as follows:

The value of DPCCH_Power_offset is confirmed by open loop power control method. The formula is DPCCH_Power_offset=Eb/No（ dB ） + （ NT+IT ） (dBm)-PG(dB)+CPICH_TX_Power

The value of CPICH_RSCP is the channel code of CPICH measured by UE.

Confirmation of c and d Use different principles according to the characteristic of single ser

vice and mixed service. Single service: obtained directly through TFC format; Mixed service: RNC calculates it according to reference TFC

Pilot Npilot bits

TPC NTPC bits

DataNdata bits


Tslot = 2560 chips, 10 bits

1 radio frame: Tf = 10 ms

DPDCH

DPCCHFBI

NFBI bitsTFCI

NTFCI bits

Tslot = 2560 chips, Ndata = 10*2k bits (k=0..6)

Frame Structure of Uplink Dedicated Physical Channel (DPCH)

Open Loop Power Control of Downlink Public Channel

The main function of downlink public channel open loop power control: Confirm the power deployment of public channel

P-CPICH 30-33 dBm

BCH -3 dB

P-SCH -3 dB

S-SCH -3 dB

PICH -7 dB

PCH -3 dB

AICH -7 dB

Open Loop Power Control of Downlink Dedicated Channel (DPCH)

The confirmation of the initial power of downlink dedicated channel:

Initial transmitted power of data domain of DPCH uses the predicted power algorithm based on CPICH Ec/N0. That is to calculate the initial transmitted power according to parameters of CPICH such as Ec/N0.

On DPCH, besides data bits, TFCI, TPC and PILOT bits are also reused. Because the information brought by these bits is important, the power needs to be larger than data domain. The configuration of power uses the offset of data domain which is indicated by PO1 (DpchPO1), PO2 (DpchPO2) and PO3 (DpchPO3).

One radio frame, Tf = 10 ms

TPC NTPC bits


Tslot = 2560 chips, 10*2k bits (k=0..7)

Data2Ndata2 bits

DPDCH

TFCI NTFCI bits

Pilot Npilot bits

Data1Ndata1 bits

DPDCH DPCCH DPCCH

The Frame Structure of Downlink Dedicated Physical Channel (DPCH)

Inner Loop Power Control

Inner loop power control is divided into uplink inner loop power control and downlink inner loop power control. For all of them, the same basic principle is to compare the power with target SIR and then adjust the power. And downlink inner loop control involves the problem of power balance.

The choice of uplink inner loop power control algorithm: One inner loop power control in 1 time slot One inner loop power control in 5 time slots

The choice of downlink inner loop power control algorithm: One inner loop power control in 1 time slot One inner loop power control in 3 time slots

Uplink Outer Loop Power Control

The basic principle is to generate judgment commands according to the quality information of measurement reporting such as CRCI and BLER. If adjustment is needed, adjust SIRTarget slowly.

Outer loop control principle of mixed service: Increase SIRtarget: increase SIRtarget as long as one

service needs to be increase; Decrease SIRtarget: decrease SIRtarget only when all

the services need to be decrease; The service with little data cannot be the reason for ad

justing SIRtarget.

Downlink Power Balance

On the condition of soft handover or macrodiversity, one UE can communicates with all the cells in the active set. UE sends the same TPC commands to the cells in the active set when processing downlink inner loop power control. But because of the different broadcast route for each radio link, it is possible that some cells receives wrong TPC commands caused by wrong code sent by TPC commands. It causes that some cells increase downlink transmitted power and the others decrease downlink power transmitted power. Then power drift appears. Downlink power balance is the method used to solve power drift.

The simple formula is shown below, Pbal should be calculated as:

The variables in the formula are defined as follows: Pref is reference power. Its value is equal to DL Reference Power (this value c

an be calculated by transmitted code power of NodeB periodic reporting (TCP: PILOT domain transmitted power of DPCH));

PP-CPICH is the transmitted power of primary CPICH; Pinit is the code power of the last time slot in the previous adjustment period. If

the last time slot in the previous period is within the transmission interval (under compressed mode), Pinit is equal to the code power in the transmission interval before;

r is the adjusted coefficient of convergence (AdjRatio). It is between 0 and 1.

(1 )( )bal ref P CPICH initP r P P P

DPCH Power Control Preamble Length

Parameter Name DPCH PC Preamble Length

Refers to TS 25.331


For uplink DPCH, it is necessary to send power control prefix before sending data channel. Closed loop power control has already started before sending power control prefix. This can guarantee that the power of data channel meets the requirement.

Location in NE Cell

Value Range [0 ， 7] Frames step 1

Default Value 0 Frames

Suggestive Value 0 Frames


N/A

Uplink Inner Loop Power Control Algorithm

Parameter Name Uplink Inner Loop Power Control Algorithm

Refers to TS 25.331


This parameter indicates which algorithm of uplink inner loop power control is used. For algorithm 1, inner loop power control executes in every time slot. And for algorithm 2, inner loop power control executes in every 5 time slots.

Location in NE RNC

Value Range 1: algorithm 1; 2: algorithm 2

Default Value 1: algorithm 1

Suggestive Value 1: algorithm 1


N/A

TPC Step Size of Uplink Inner Loop Power Control

Parameter Name TPC Step Size (TPC Step Size of Uplink Inner Loop Power Control)

Refers to TS 25.331

Parameter Description This parameter indicates the TPC step size of uplink inner loop power control. This parameter needs to be set only when algorithm 1 is chosen for uplink inner loop power control algorithm. For algorithm 2, TPC step size is equal to the default value (1) and unnecessary to be set.

Location in NE RNC

Value Range [1, 2] dB

Default Value 1dB



N/A

Downlink Power Control Mode of Inner Loop

Parameter Name DPC Mode (Downlink Power Control Mode of Inner Loop)

Refers to TS 25.331


This parameter indicates which algorithm of downlink power control of inner loop is used. There are two kind of downlink power control of inner loop, single time slot and 3 time slots. Which algorithm should be used needs to be sent to UE.This parameter indicates which algorithm of uplink inner loop power control is used. For algorithm 1, inner loop power control executes in every time slot. And for algorithm 2, inner loop power control executes in every 5 time slots.

Location in NE RNC

Value Range 0: single time slot mode; 1: 3 time slots mode

Default Value 0: single time slot mode

Suggestive Value 0: 3 time slots mode


N/A

TPC Step Size of Downlink Inner Loop Power Control

Parameter Name TPC DL Step Size (TPC Step Size of Downlink Inner Loop Power Control)

Refers to TS 25.433


This parameter indicates the TPC step size of downlink inner loop power control. The value of this parameter is usually set to smaller in the stable channel. And the value is usually set to bigger in the harsh radio environment.

Location in NE RNC

Value Range (0.5, 1, 1.5, 2) dB

Default Value 1 dB

Suggestive Value 1 dB


N/A

DPCH Maximum Downlink Transmitted Power

Parameter Name DPCH Maximum DL Power (DPCH Maximum Downlink Transmitted Power)

Refers to TS 25.433


This parameter indicates the downlink maximum transmitted power of DPCH. When executing downlink inner loop power control, the new transmitted power must be less than or equal to the configuration of DPCH maximum downlink transmitted power. If the new transmitted power is bigger than the configuration of DPCH maximum downlink transmitted power, it must be set equal to DPCH maximum downlink transmitted power.

Location in NE RNC

Value Range [-35 ， 15 ] dB step 0.1 dB

Default Value

Suggestive Value The same as Default Value


Be relative to service subcategory, and MaxDlDpchPwr > MinDlDpchPwr

DPCH Minimum Downlink Transmitted Power

Parameter Name DPCH Minimum DL Power (DPCH Minimum Downlink Transmitted Power)

Refers to TS 25.433


This parameter indicates the downlink minimum transmitted power of DPCH. When executing downlink inner loop power control, the new transmitted power must be more than or equal to the configuration of DPCH minimum downlink transmitted power. If the new transmitted power is smaller than the configuration of DPCH minimum downlink transmitted power, it must be set equal to DPCH minimum downlink transmitted power.

Location in NE RNC

Value Range [-35 ， 15 ] dB step 0.1 dB

Default Value

Suggestive Value The same as Default Value


Be relative to service subcategory, and MaxDlDpchPwr> MinDlDpchPwr

Uplink DPCH Maximum Transmitted Power

Parameter Name Maximum Allowed Uplink DPCH Transmission Power (Uplink DPCH Maximum Transmitted Power)

Refers to TS 25.331


This parameter indicates the uplink DPCH maximum transmitted power of UE. When executing uplink inner power control, the transmitted power calculated by UE may be bigger than the value of this parameter. On this condition, UE can only transmit with the configuration of uplink DPCH maximum transmitted power.

Location in NE RNC

Value Range [-50 ， 33] dBm step 1

Default Value 33dBm

Suggestive Value 33dBm


N/A

AckPwrOffset

Parameter Name HS-DPCCH ACK Power Offset for Single Radio Link or Intra-NodeB Handover

Refers to TS 25.331, TS 25.433


This parameter indicates the relative configuration value of power during HS-DPCCH ACK handover on single link or in intra-NodeB. It is the power offset relative to DPCCH.

Location in NE RNC

Value Range [0 ， 8]

Default Value 6

Suggestive Value

6


N/A

NackPwrOffset

Parameter Name HS-DPCCH NACK Power Offset for Single Radio Link or Intra-NodeB Handover



This parameter indicates the relative configuration value of power during HS-DPCCH NACK handover on single link or in intra-NodeB. It is the power offset relative to DPCCH.

Location in NE RNC


Default Value 6

Suggestive Value

6


N/A

CqiPwrOffset

Parameter Name HS-DPCCH CQI Power Offset for Single Radio Link or Intra-NodeB Handover



This parameter indicates the relative configuration value of power during HS-DPCCH CQI handover on single link or in intra-NodeB. It is the power offset relative to DPCCH.

Location in NE RNC


Default Value 5

Suggestive Value

5


N/A

InterAckPwrOfst

Parameter Name HS-DPCCH ACK Power Offset for Inter-NodeB Handover



This parameter indicates the relative configuration valu

e of power during HS-DPCCH ACK handover in inter-N

odeB. It is the power offset relative to DPCCH.

Location in NE RNC


Default Value 6

Suggestive Value 6


N/A

InterNackPwrOfst

Parameter Name HS-DPCCH NACK Power Offset for Inter-NodeB Handover



This parameter indicates the relative configuration value of power during HS-DPCCH NACK handover in inter-NodeB. It is the power offset relative to DPCCH.

Location in NE RNC


Default Value 6

Suggestive Value 6


N/A

InterCqiPwrOfst

Parameter Name HS-DPCCH CQI Power Offset for Inter-NodeB Handover



This parameter indicates the relative configuration value of power during HS-DPCCH CQI handover in inter-NodeB. It is the power offset relative to DPCCH.

Location in NE RNC


Default Value 5

Suggestive Value 5


N/A

03-wpo-17 wcdma urtan parameter introduction-89

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