Huawei PC-II Parameter

HUAWEI POWER CONTROL - IPresented By: Athar Ishrat – Optimization South

Huawei Power Control - I

Huawei - I Huawei - II

Page2

Measurement report pre-processing

Aim achieved ?

Power control calculation and adjustment

N

Y


Original data of power control -- measurement report

Page3

Network

Downlink Downlink measurement measurement

reportreport

Uplink MRUplink MR

BTS

Measurement report pre-processing -- interpolation Each measurement report has a serial number. When

the serial numbers are discontinuous, this indicates that some measurement reports must be missed. In this case, the network will fill up the measurement report according to interpolation algorithm.

MR MR MR MR MR

Measurement report serial number n

Measurement report serial number n+4

Consecutive measurement report flow

3 missing measurement reports3 missing measurement reports


Measurement report pre-processing - filtering Calculate average results of several consecutive

measurement reports to obtain the current information, reduce the influence of some abnormal measurement reports for the judgment of power control.

MR MR

MR

MR MR MR

Consecutive measurement report flow

FilterFilter


HW I power control judgment (Stable adjustment stage) Transmitting power adjustment =

(expected stable uplink or downlink RXLEV – actual uplink or

downlink RXLEV) * uplink or downlink RXLEV compensation factor

+ (actual uplink or downlink RXQUAL - expected uplink or

downlink RXQUAL)*10* uplink or downlink quality compensation

factor

The final adjustment power level should not exceed the maximum

power control step size

Final stable level = current level + transmitting power adjustment

Page6HW I Power ControlHW I Power Control

HW I Power Control

HW I power control judgment (Initial adjustment stage) Transmitting power adjustment = (actual initial RXLEV – expected

initial RXLEV) * uplink RXLEV compensation factor

Final transmitting power = initial RXLEV – transmitting power adjustment

If the RXLEV lower than the expected initial RXLEV, power control will not occur within initial adjustment stage

Page7

HW I Power Control

Power control will not occur in case of these four conditions Both level and quality equal to the setting values

(HW I power control), or level and quality are within threshold band(HW II power control)

Adjusting range for MS less than error tolerance Adjusting range less than minimum power control

step of BTS The RXLEV lower than the expected initial RXLEV

within initial adjustment stage

HW I power control judgment Before judging the signal level to be adjusted, query the error

tolerance table according to the current transmitting power level. Adjustment will not be done if the power adjustment value is less than the error tolerance value.

Error tolerance table for 900M and 1800M is as follows:

1800M:

Level0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Error tolerance 2 2 2 2 2 2 2 2 2 3 3 3 3 3 4 4 4 2 2 2

900M

Level 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Error tolerance 2 2 2 4 4 4 4 4 4 4 4 4 4 4 4 4 6 6 6 6


Comparison uplink and downlink of HW I power control . Similarity:

1. To avoid frequently changes of signal level, the PC interval time between the two consecutive uplink and downlink power control are limited.

2. To reduce the influence caused by abnormal reports, all measurement reports should be filtered.

3. Both uplink and downlink power controls include level-specific and quality-specific power controls.

4. Both uplink and downlink power controls have maximum power control step size limit and compensating factor.


Comparison uplink and downlink of HW I power control . Differentia:

1. Including power control for the stable stage, MS also has power

control when MS access the network, thus to reduce transmitting power

of MS as soon as possible.

2. For uplink, precautions are ready for increase MS transmitting power

in case HO fails.

3. For downlink, there are maximum and minimum transmitting power

limits in power control data configuration.

4. MS has the error tolerance table.


[BTS power control table][BTS power control table]

HW I power control data configuration and

parameter introduction

Parameter name

Meaning Value range

Recommended value

DL RX_LEV Expected

The expected signal level of MS in stable status, Expected stable downlink signal level > downlink edge HO threshold，Otherwise, ping-pang HO will be caused.

0～63 35

DL RX_LEV Compensation

The power adjustment value varies with this parameter. The adjustment value caused by power level equal to the difference between the expected signal level and the actual receiving signal level multiply this factor.

0～100％ 80％ (signal ex-signal rx)*80%=adjust

ment value

DL Qual. Expected

Expected signal quality of MS in stable status. 0 ～ 7 Levels

1

DL Qual.Compensation

The power adjustment value varies with this parameter. The adjustment value caused by signal quality equal to 10*difference between the expected signal quality level and the actual receiving signal quality level multiply this factor.

0～100％ 20％ [10*(quality RX-quality EX)*20%]

MAX PC Step

maximum adjustment range in one BTS power control command

Levels 0~16, 2dB each step

8


[BTS power control table][BTS power control table]Parameter

name Meaning Value

range Recommende

d value BTS PC Period

Time interval for implementing two power control commands (unit count of SACCH period)

1～10 5

Filter length for DL

RX_LEV

Content: indicating the number of measurement reports in which the average of uplink signal strength is taken before MS power adjustment at stable stage. The purpose is to remove the influence of some abnormal reports. When the filter length is too long, the influence due to abnormal reports will be weakened, but the MS power adjustment is not timely.

1～32 5

BTS Min power

Indicating the minimum transmitting power value supported by the BTS

0~36 4

BTS Max power

Indicating the maximum transmitting power value supported by the BTS.

0~56 According to BTS type


[MS power control data table][MS power control data table]

Parameter name

Meaning Value range Recom-mended

value initial

RX_LEV expected

The expected BTS receiving signal level in the initial stage when MS access the network.

0~63 level 30@ 80dBm

Stable EX_LEV Expected

The expected BTS receiving signal level in stable status. Expected stable signal level > uplink margin HO threshold (HO parameter). Otherwise, “ping-pang” HO will be caused.

0~63 level 30@ 80dBm

UL RX_LEV compensati

on

Give an adjustment for the power control level value, the actual power level value MS should change is the result of this parameter multiply the difference between the expected uplink signal level and the actual BTS receiving signal level.

0~100％ 80％

UL Qual. Expected

The expected BTS receiving signal quality in stable status. 0~7 level 1

UL Qual. compensat

ion

The power adjustment value varies with this parameter. The adjustment value caused by signal quality equal to 10*difference between the expected signal quality level and the actual receiving signal quality level times this factor.

0～100％ 20％

Max PC step

The maximum level of MS power that can be dynamically adjusted.

Level 1~16, 2dB/level.

8


Parameter name Meaning Value

range Value recommended

PC interval Time interval between the implementations of two power control algorithms; unit: SACCH period

0~30

(SACCH period)

5

Filter length for Initial RX_LEV

This is the number of measurement reports required for predicting the signal strength at the initial stage. Unit: Measurement reports

1~32 2

Filter length for stable RX_LEV

This is the number of measurement reports required for predicting the signal strength at the stable power control stage. Unit: Measurement reports

1-31 5

Filter length for Qual.

This is the number of the measurement reports required for assessing signal quality at the stable stage. Unit: Number of measurement reports

1~30 6

[MS power control table][MS power control table]


Given conditions: 900M MS transmitting at the maximum power,

uplink receiving level of the 900M BTS is –60dBm, uplink quality level is always 0.

Parameter configuration in [BTS power/MS power control table] is as follows – “stable RX_LEV Expected” is 35, “UL RX_LEV Compensation” is 80, “UL Qual. expected ” is 1, and “UL Qual. compensation” is 20, and the max. PC step is 16dB.

Exercise

HW I power control exercise Question:

1. Suppose that power control will no longer be done once the power value to be adjusted is less than 2dB, what is the approximate stable power value after power control with the above data configuration?

2. According to the error tolerance list, suppose the initial MS transmitting power is level 3, what is the maximum uplink receiving level in stable status after power control?

Exercise

HW I power control exercise Answers for question 1:

Stable level = current actual level + [(expected signal intensity in stable status – current actual level) * uplink path loss compensating factor] + [actual current quality – expected uplink signal quality) * 10 * uplink quality compensating factor] = -60+[(-75-(-60))*80 ％ ]+[(0-1)*10*20％ ] = -60-12-2 ＝ -74dBm. Now it’s necessary to adjust -14dB (no larger than the maximum power control step size), but it needs further adjustment because it fails to reach -75dBm, the “expected signal level in stable status”. Use -74 in the above formula again for calculation, and the power to be adjusted is -2.8dB. Because no power control adjustment will be done when the power value to be adjusted is smaller than -2, it still needs to be changed 2dB lower, so the uplink receiving level is -76dBm at last.

Exercise

Answers for question 2: Query the error tolerance table, the tolerance of level 3

is 4dB, the power to be adjusted for the second time is 2.8, which is less than 4 and up to the requirement, so the final uplink receiving level is -74dBm in stable status.

Exercise

Total Cell count = 2651

BSC6000 Power Control Parameter

HW II Power Control ParameterPage21

PC Interval Count of Cells3 21424 125 497

AMR PC Interval Count of Cells3 26075 44

Filter Length for UL RX_LEV

Filter Length for DL RX_LEV

Filter Length for UL Qual.

Filter Length for DL Qual.

Count of Cells

4 4 4 4 19825 5 4 4 35 5 5 5 2396 5 5 5 26 6 6 6 425

AMR Filter Length for UL

RX_LEV

AMR Filter Length for DL

RX_LEV

AMR Filter Length for UL

Qual

AMR Filter Length for DL

Qual.

Count of

Cells4 4 4 4 22705 5 5 5 326 6 6 6 349

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HW II Power Control Parameter

MR. Compensation Allowed Count of CellsYes 2651

AMR MR. Compensation Allowed Count of CellsYes 2651

UL MR. Number Predicted DL MR. Number Predicted Count of Cells0 0 4602 2 2191

AMR UL MR. Number Predicted

AMR DL MR. Number Predicted Count of Cells

0 0 11232 2 1528

BTS PC Class Count of Cells16 2651

AMR BTS PC Class Count of Cells16 2651

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UL RX_LEV Upper Threshold

UL RX_LEV Lower Threshold

DL RX_LEV Upper Threshold

DL RX_LEV Lower Threshold Count of Cells

24 18 26 20 927 20 35 25 330 18 25 20 3130 20 35 25 175730 20 40 30 9830 20 45 35 7030 20 63 53 630 22 30 24 41430 25 35 25 430 25 40 30 16530 25 45 35 2635 20 35 25 1835 25 40 30 3235 25 45 35 1535 25 55 45 3

Page24


AMR UL RX_LEV Upper Threshold

AMR UL RX_LEV Lower Threshold

AMR DL RX_LEV Upper Threshold

AMR DL RX_LEV Lower

ThresholdCount of

Cells24 18 26 20 927 25 40 30 330 18 25 20 3130 18 26 20 930 20 35 25 250130 20 45 35 1530 20 63 53 630 25 40 30 935 20 35 25 4135 25 40 30 27

Page25


UL Qual. Upper Threshold

UL Qual. Lower Threshold

DL Qual. Upper Threshold

DL Qual. Lower

Threshold

Count of

Cells0 2 0 2 7440 2 0 3 30 3 0 2 3660 3 0 3 3061 3 0 2 61 3 1 3 1226

AMR ULQual. Upper Threshold

AMR UL Qual. Lower Threshold

AMR DL Qual. Upper Threshold

AMR DL Qual. Lower

Threshold

Count of

Cells0 2 0 2 390 3 0 3 1091 3 1 3 2503

Page26


MAX Down Adj.Value

Qual.Zone 0

MAX Down Adj.Value

Qual.Zone 1

MAX Down Adj.Value

Qual.Zone 2 Count of Cells12 6 2 4234 2 2 394 4 4 21588 6 4 31

AMR MAX Down Adj. Value Qual.

Zone 0


Zone 2


Zone 1 Count of Cells4 2 2 7444 4 4 18768 4 6 31

MAX Down Adj. PC Value by Qual.

MAX Up Adj. PC Value by RX_LEV

MAX Up Adj. PC Value by Qual. Count of Cells

4 16 8 2651

AMR MAX Down Adj. PC Value by

Qual.

AMR MAX Up Adj. PC Value by

RX_LEVAMR MAX Up Adj. PC Value by Qual. Count of Cells

4 16 8 2651

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UL Qual. Bad Trig Threshold

UL Qual. Bad UpLEVDiff

DL Qual. Bad Trig Threshold

DL Qual. Bad UpLEVDiff

Count of Cells

4 0 4 0 1374 10 4 10 435 0 5 0 23095 10 4 10 155 10 5 10 35 5 5 5 786 0 5 0 486 5 6 5 18

AMR UL Qual. Bad Trig

ThresholdAMR UL Qual.

Bad UpLEVDiffAMR DL Qual Bad

Trig ThresholdAMR DL Qual

Bad UpLEVDiffCount

of Cells4 0 4 0 1374 10 4 10 6665 0 5 0 16885 10 5 0 155 10 5 10 495 5 5 5 786 5 6 5 18

HW II Power Control ConfigurationPage28

Parameter name

Meaning Value range

Recommended value

filter length for UL

RX_LEV

How many uplink measurement reports obtained for the average uplink signal level to be used for uplink power control adjustment.

1~20 6

filter length for DL

RX_LEV

How many downlink measurement reports obtained for the average downlink signal level to be used for downlink power control adjustment.

1~20 6

filter length for UL Qual.

How many uplink measurement reports obtained for the average uplink quality level to be used for uplink power control adjustment.

1~20 6

filter length for DL Qual.

How many downlink measurement reports obtained for the average downlink quality level to be used for downlink power control adjustment.

1~20 6

MR compensation

allowed

If “yes”, System put the currently received measurement report into the measurement report compensation queue, and record the transmitting power information according to MS and BTS power values. And then interpolation, compensate the receiving level value of the record measurement report according to the power change information.

Yes, no Yes

UL MR number

predicted

The number of uplink pred. MR in the filter using for power control judgment.

0~3 reports

2

DL MR number

predicted

The number of downlink pred. MR in the filter using for power control judgment.

0~3 reports

2

[HW II power control table] main parameters – 1 [HW II power control table] main parameters – 1


Parameter name

Meaning Value range

Recommended value

PC interval Time between two power control command implementation 1~30

(SACCH period)

5

UL RX_LEV upper

threshold

This parameter specifies the uplink signal level upper threshold. When the signal level higher than this value, calculate a power

decrement [=receiving level - (upper threshold + lower threshold)/2]. This decrement value should consider together with

the maximum step size allowed for different quality zone which the receiving signal quality located.

0~63 (-110 dBm – -47 dBm)

35

UL RX_LEV lower

threshold

This parameter specifies the uplink signal level lower threshold. When the signal level lower than this value, calculate a power

increase [= (upper threshold + lower threshold)/2- receiving level]. This increase also consider together with the maximum step size

allowed for different quality zone which the receiving signal quality located.

0~63 (-110 dBm – -47 dBm)

25

UL Qual. upper

threshold This parameter specifies the uplink quality upper threshold.

Level 0~7

0

UL Qual. lower

threshold

This parameter specifies the uplink quality lower threshold for power control

Level 0~7

2

[HW II power control table] main parameters – 2[HW II power control table] main parameters – 2


Parameter name

Meaning Value range

Recommended value

DL RX_LEV upper threshold

This parameter specifies the downlink signal level upper threshold. When the signal level higher than this value, calculate a power decrement [=receiving level – (upper threshold + lower threshold)/2]. This decrement should consider together with the maximum step size allowed for different quality zone which the receiving signal quality located.

0~63 (-110 dBm –

-47 dBm) 40

DL EX_LEV lower threshold

This parameter specifies the downlink signal level lower threshold. When the signal level lower than this value, calculate a power increase [= (upper threshold + lower threshold)/2- receiving level]. This increase also consider together with the maximum step size allowed for different quality zone which the receiving signal quality located.

0~63 (-110 dBm –

-47 dBm) 30

DL Qual. upper threshold

This parameter specifies the downlink quality upper threshold for power control

Level 0~7 0

DL Qual. lower threshold

This parameter specifies the downlink quality lower threshold for power control

Level 0~7 2

[HW II power control table] main parameters [HW II power control table] main parameters –– 33

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[HW II power control table] main parameters [HW II power control table] main parameters –– 44Parameter

name Meaning Value range

Recommended value

MAX Down Adj. value Qual.

zone 0

This parameter specifies the maximum downward power adjustment value when the Rx quality is 0.

0~30dB 16


zone 1

This parameter specifies the maximum downward power adjustment value when the Rx quality is 1 or

2 0~30dB 8


zone 2

This parameter specifies the maximum downward power adjustment value when the Rx quality is

equal to or more than 3. 0~30dB 4

MAX Down Adj. PC Value by

Qual.

The adjustment step allowed for the downward power control due to receiving signal quality.

0~4dB 4

HW II Power Control Configuration




Recommended value

MAX Up Adj. PC Value by

RX_LEV

It is used to set the maximum adjustment step for upward power control by receive level.

0~32dB 16

MAX Up Adj. PC Value by

Qual.

It is used to set the maximum adjustment step for upward power control by receive quality.

0~32dB 8

UL Qual. Bad TrigThrsh

In uplink power control, when the receiving quality of uplink is not less than this start threshold, the

actual "upper threshold of signal strength of uplink" will be added with "upper threshold offset of level when the receiving quality of uplink is poor" in the

data configuration. Thus, the expected level in uplink power control can be increased furthermore.

0~7 5

UL Qual. Bad UpLEVDiff

In uplink power control, when the receiving quality is not less than "start threshold when the receiving

quality of uplink is poor", the actual "upper threshold of signal strength of uplink" will be added with this

offset value.

0~63dB 0




Recommended value

DL Qual. Bad TrigThrsh

In downlink power control, when the receiving quality of downlink is not less than this start

threshold, the actual "upper threshold of signal strength of downlink" will be added with "upper

threshold offset of level when the receiving quality of downlink is poor" in the data configuration. Thus, the expected level in downlink power control can be

increased furthermore.

0~7 5

DL Qual. Bad UpLEVDiff

In downlink power control, when the receiving quality is not less than "start threshold when the receiving quality of downlink is poor", the actual

"upper threshold of signal strength of downlink" will be added with this offset value.

0~63dB 0

Documents

Huawei PC-II Parameter