Huawei PC-II Parameter
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Transcript of 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
Huawei Power Control - I
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
Huawei Power Control - I
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
Huawei Power Control - I
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
Huawei Power Control - I
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.
Huawei Power Control - I
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.
Huawei Power Control - I
[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
Huawei Power Control - I
[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
Huawei Power Control - I
[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
Huawei Power Control - I
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]
Huawei Power Control - I
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
Page22
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
Page23
HW II Power Control Parameter
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
HW II Power Control Parameter
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
HW II Power Control Parameter
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
HW II Power Control Parameter
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
AMR MAX Down Adj. Value Qual.
Zone 2
AMR MAX Down Adj. Value Qual.
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
Page27
HW II Power Control Parameter
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
HW II Power Control ConfigurationPage29
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
HW II Power Control ConfigurationPage30
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
Page31
[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
MAX Down Adj. value Qual.
zone 1
This parameter specifies the maximum downward power adjustment value when the Rx quality is 1 or
2 0~30dB 8
MAX Down Adj. value Qual.
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
HW II Power Control ConfigurationPage32
[HW II power control table] main parameters [HW II power control table] main parameters –– 55Parameter
name Meaning Value range
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
HW II Power Control ConfigurationPage33
[HW II power control table] main parameters [HW II power control table] main parameters –– 66Parameter
name Meaning Value range
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