microsoft power point - 5 omf010003 power control issue1
TRANSCRIPT
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
1/33
www.huawei.com
Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Power Control
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
2/33
Page2Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents1. Power Control Overview
2. HWPower Control
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
3/33
Page3Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Power Control Overview Power control
Adjust the transmitting power of BTS and MS when needed.
Based on measurement reports of BTS and MS
Purpose
Save the power of BTS and MS
Reduce the interference of the network
Increase the quality of the network
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
4/33
Page4Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Power Control Overview Power control includes uplink power control and downlink
power control, Which are performed independently
Uplink power control: Adjust TX power of MS to let BTS receive
stable signal, reduce the uplink co-channel and adjacent
channel interference, reduce power consumption of MS
Downlink power control: Adjust BTS TX power to let MS receive
stable signal, reduce the downlink co-channel and adjacent
channel interference, reduce power consumption of BTS
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
5/33
Page5Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Power Control Overview Process of power control commands
It takes 3 measurement report periods(480ms/period) fromcommand sending to execution.
SA0 SA1SA0 SA0SA1SA1 SA2SA2SA2 SA3SA3SA3
BTS sends the command for power
control and TA in SACCH header.
MS obtains SACCH
block
MS begins to send the
measurement report of thelast multi-frame.
In the 26 multi-frames,
frame 12 sends
SACCH.
BTS receives the
measurement report
SACCCH report period:
26X4=104 frames (480ms)
MS adopts the new
power level and TA
MS begins to set up a new SACCH header
to report the new TA and power control
message.
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
6/33
Page6Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Power Control Overview Power control judgment
Power control judgment is controlled by BTS measurementreport pre-processing item which can be selected in handover
control data table
MR. Pre-process (measurement report pre-processing): This
switch decide where power control be processed. If
measurement report pre-processing is yes, power control is
processed in BTS, and when setting it no, power control isprocessed in BSC
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
7/33
Page7Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Power Control Overview Up link and Down link power control can be enabled
independently
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
8/33
Page8Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Contents1. Power Control Overview
2. HW Power Control
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
9/33
Page9Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Original data of power control -- measurement report
Network
DownlinkDownlinkmeasurementmeasurement
reportreport
Uplink MRUplink MR
BTS
HW II Power ControlHW II Power Control
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
10/33
Page10Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
UplinkUplink
measurementmeasurement
reportreport
DownlinkDownlink
measurementmeasurementreportreport
HW II Power ControlHW II Power Control Measurement report
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
11/33
Page11Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
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 MRMR MR MR
Measurementreport serialnumber n
Measurement reportserial number n+4
Consecutive measurement report flow
3 missing measurement reports3 missing measurement reports
HW II Power ControlHW II Power Control
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
12/33
Page12Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Measurement report pre-processing -- filtering
Calculate average results of several consecutive measurementreports to obtain the current information, reduce the influence
of some abnormal measurement reports for the judgment of
power control.
MRMR MRMR
MR MR
Consecutive measurement report flow
FilterFilter
HW II Power ControlHW II Power Control
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
13/33
Page13Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
HW II Power Control Power control judgment process
Measurement report pre-processing
The power control
demand according to the
receiving level
Send the power controlcommand
The power control
demand according
to receiving quality
General power controljudgement
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
14/33
Page14Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
HW II Power Control Measurement report compensation
Purpose: Ensure the accuracy of selection of the history measurement
report before filtering.
Implementation steps:
1. Put the current receiving measurement report into the measurement report
compensation queue.
2. Record the changed information of the transmitting power according to the
MS and BTS power levels in the measurement report.
3. After finish the measurement report interpolation, system will compensate
the receiving level of the history measurement report according to the power
change information. The compensated measurement reports will be the
original data in the filter process.
4. Filter the compensated measurement reports.
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
15/33
Page15Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
HW II Power Control Measurement report compensation
The expected receiving signal level: 30
The power control will be more effective with measurement report compensation.
The expected receiving signal level: 30
The power control will be more effective with measurement report compensation.
X axis
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950
0
10
20
30
40
50
60
70
Ya
xis
Power control diagram when there ismeasurement report compensation
Diagram when there is no power control
Power control diagram when there is nomeasurement report compensation
Power control effect diagram of measurement report compensation
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
16/33
Page16Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
HW II Power Control Measurement report prediction
Purpose: Avoid power control later than needed, the delay is
dangerous in case of poor level or bad quality
Implementation procedure
1. Analyze the tendency of MR by the historical measurement
reports after interpolation.
2. Guide by the tendency, to predict the values of measurement
report to be received. There are 0~3 measurement reports
prediction, which are configured on OMC.
3. Filter the interpolated, compensated and predicted
measurement reports, and implement power control judgment.
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
17/33
Page17Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
HW II Power Control Measurement report prediction
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950
X axis
15
20
25
30
35
40
4550
Y
axis
No power control
Mean filter powercontrol
Prediction filter powercontrol
Diagram of power control effect comparison between prediction filter and mean filter
The expected receiving signal level: 30
The power control with prediction filter will be more effective than that with
mean filter
The expected receiving signal level: 30
The power control with prediction filter will be more effective than that withmean filter
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
18/33
Page18Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
HW II Power Control Implementation Power control demand based on receiving level.
After measurement report pre-processing, the power control
module makes a comparison between the expected signal
level and the current receiving signal level.
Calculate the transmitting power level step size to be adjusted,
making the receiving level value closer to the expected value.
Adopt variable step size when adjusting the transmitting power
according to the receiving level, so as to achieve the expected
level as soon as possible.
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
19/33
Page19Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
HW II Power Control Implementation Power control demand based on receiving quality
After measurement report pre-processing, the power control module
makes comparison between the expected quality level and the current
receiving quality level.
Calculate the step size of the transmitting power level to be adjusted.
Increase the transmitting power in case of poor receiving quality.
Decrease the transmitting power in case of good receiving quality.
Adopt fixed step size when adjust the transmitting power according to
the receiving quality.
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
20/33
Page20Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
HW II Power Control Implementation General power control judgment
Power control by receiving
level
Power control by receiving
quality
Power control by signal level and
quality
AdjStep_Lev AdjStep_Qul max(AdjStep_Lev,AdjStep_Qul)
AdjStep_Lev AdjStep_Qul No action
AdjStep_Lev No action AdjStep_Lev
AdjStep_Lev AdjStep_Qul AdjStep_Lev
AdjStep_Lev AdjStep_Qul max(AdjStep_Lev,AdjStep_Qul)
AdjStep_Lev No action AdjStep_Lev
No action AdjStep_Qul AdjStep_A
No action AdjStep_Qul AdjStep_B
No action No action No action
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
21/33
Page21Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
HW II Power Control Feature Adaptive power control:
Adaptive power control refers to changeable power control
strategy according to the communication environment, it makes
power control more effective and stable.
Automatically change the adjustable maximum step size of power
control according to different communication environment
(different receiving quality).
Adopt different power control strategies according to different
communication environments (different receiving quality and level). Max. step is different between increase and decrease.
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
22/33
Page22Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
HW II Power Control Feature Power control within the upper/lower thresholds
As for HW II power control in case of calculating powercontrol step size according to signal level and quality, the
signal level and quality have upper/lower thresholds. Power
control will not execute if the signal level and quality is within
the threshold bands.
Avoid the signal level up-and-down caused by power control.
The upper threshold can be increased dynamically in case ofbad quality.
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
23/33
Page23Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Measurement report compensation -- makes power control
judgment more accurate
Measurement report prediction --to avoid power control later
than needed, the delay is dangerous in case of poor level or
bad quality
Power control expected signal level and quality threshold
falls within a band, this avoids receiving signal level
fluctuate up and down frequently
HW II Power Control Advantages
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
24/33
Page24Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
HW II Power Control Configuration[HW II power control table] main parameters[HW II power control table] main parameters 11
Parametername
MeaningValuerange
Recommendedvalue
filter length
for ULRX_LEV
How many uplink measurement reports obtained for the averageuplink signal level to be used for uplink power control adjustment. 1~20 6
filter lengthfor DL
RX_LEV
How many downlink measurement reports obtained for the averagedownlink signal level to be used for downlink power controladjustment.
1~20 6
filter lengthfor UL Qual.
How many uplink measurement reports obtained for the averageuplink quality level to be used for uplink power control adjustment.
1~20 6
filter lengthfor DL Qual.
How many downlink measurement reports obtained for the average
downlink quality level to be used for downlink power controladjustment.
1~20 6
MRcompensation
allowed
If yes, System put the currently received measurement report intothe measurement report compensation queue, and record thetransmitting power information according to MS and BTS powervalues. And then interpolation, compensate the receiving levelvalue of the record measurement report according to the powerchange information.
Yes, no Yes
UL MRnumber
predicted
The number of uplink pred. MR in the filter using for power controljudgment.
0~3reports
2
DL MRnumber
predicted
The number of downlink pred. MR in the filter using for powercontrol judgment.
0~3reports
2
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
25/33
Page25Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
HW II Power Control Configuration[HW II power control table] main parameters[HW II power control table] main parameters 22
Parameter
name
MeaningValue
range
Recommended
value
PC interval Time between two power control command implementation1~30
(SACCHperiod)
5
UL RX_LEVupper
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 + lowerthreshold)/2]. This decrement value should consider together with
the maximum step size allowed for different quality zone whichthe receiving signal quality located.
0~63(-110 dBm -47 dBm)
35
UL RX_LEVlower
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 signalquality located.
0~63(-110 dBm -47 dBm)
25
UL Qual.upperthreshold
This parameter specifies the uplink quality upper threshold. Level0~7
0
UL Qual.lower
threshold
This parameter specifies the uplink quality lower threshold forpower control
Level0~7
2
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
26/33
Page26Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
HW II Power Control Configuration[HW II power control table] main parameters[HW II power control table] main parameters 33
Parametername
MeaningValuerange
Recommendedvalue
DL RX_LEVupper threshold
This parameter specifies the downlink signal level upperthreshold. When the signal level higher than this value,calculate a power decrement [=receiving level (upperthreshold + lower threshold)/2]. This decrement shouldconsider together with the maximum step size allowed fordifferent quality zone which the receiving signal qualitylocated.
0~63(-110 dBm
-47 dBm)40
DL EX_LEVlower threshold
This parameter specifies the downlink signal level lowerthreshold. When the signal level lower than this value,calculate a power increase [= (upper threshold + lowerthreshold)/2- receiving level]. This increase also considertogether with the maximum step size allowed for differentquality zone which the receiving signal quality located.
0~63(-110 dBm
-47 dBm)30
DL Qual. upperthreshold
This parameter specifies the downlink quality upperthreshold for power control
Level 0~7 0
DL Qual. lowerthreshold
This parameter specifies the downlink quality lowerthreshold for power control
Level 0~7 2
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
27/33
Page27Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
[HW II power control table] main parameters[HW II power control table] main parameters 44
Parametername
Meaning Value rangeRecommended
value
MAX Down Adj.value Qual.
zone 0
This parameter specifies the maximum downwardpower adjustment value when the Rx quality is 0.
0~30dB 16
MAX Down Adj.value Qual.
zone 1
This parameter specifies the maximum downwardpower adjustment value when the Rx quality is 1 or
20~30dB 8
MAX Down Adj.value Qual.
zone 2
This parameter specifies the maximum downwardpower adjustment value when the Rx quality is
equal to or more than 3.0~30dB 4
MAX Down Adj.
PC Value byQual.
The adjustment step allowed for the downwardpower control due to receiving signal quality. 0~4dB 4
HW II Power Control Configuration
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
28/33
Page28Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
HW II Power Control Configuration[HW II power control table] main parameters[HW II power control table] main parameters 55
Parametername
Meaning Value rangeRecommended
value
MAX Up Adj.PC Value by
RX_LEV
It is used to set the maximum adjustment step forupward power control by receive level.
0~32dB 16
MAX Up Adj.PC Value by
Qual.
It is used to set the maximum adjustment step forupward power control by receive quality.
0~32dB 8
UL Qual. BadTrigThrsh
In uplink power control, when the receiving qualityof 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 levelwhen the receiving quality of uplink is poor" in the
data configuration. Thus, the expected level inuplink power control can be increased furthermore.
0~7 5
UL Qual. BadUpLEVDiff
In uplink power control, when the receiving quality isnot less than "start threshold when the receiving
quality of uplink is poor", the actual "upper thresholdof signal strength of uplink" will be added with this
offset value.
0~63dB 0
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
29/33
Page29Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
HW II Power Control Configuration[HW II power control table] main parameters[HW II power control table] main parameters 66
Parametername
Meaning Value rangeRecommended
value
DL Qual. BadTrigThrsh
In downlink power control, when the receivingquality of downlink is not less than this start
threshold, the actual "upper threshold of signalstrength of downlink" will be added with "upper
threshold offset of level when the receiving qualityof downlink is poor" in the data configuration. Thus,the expected level in downlink power control can be
increased furthermore.
0~7 5
DL Qual. BadUpLEVDiff
In downlink power control, when the receiving
quality is not less than "start threshold when thereceiving quality of downlink is poor", the actual"upper threshold of signal strength of downlink" will
be added with this offset value.
0~63dB 0
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
30/33
Page30Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Exercises for HW II power control
Given conditions:
The uplink receiving level is -55dBm, the quality is level 0. Power control
algorithm is HW II.
Data configuration is as follows: Uplink signal level upper threshold: -
60dBm, uplink signal level lower threshold: - 80dBm. Uplink signal upper
quality threshold: level 1. Uplink signal lower quality threshold: level 2. Thedownward adjustable step size of quality band 0 is 16dB, of quality band 1
is 8dB, and of quality 2 is 4 dB. The upward adjustable step size of
receiving level is 16dB. The upward or downward adjustable step size for
power control by quality are both 4dB.
Question: What will be the uplink stable receiving level after power
control?
ExerciseExercise
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
31/33
Page31Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Exercise Exercises for HW II power control
Answer.
First, transmitting power to be reduced according to receiving level =
actual receiving level -(uplink signal level upper threshold + uplink signal
level lower threshold)/2-55- (-60 + (-80))/2(-55)-(-70)15dB. As the
receiving quality is level 0, downward adjustable step size of quality band 0
can be used -- decrease 16dB.
Second, the transmitting power to be decreased according to receiving
quality = as power control adjustment step size by quality is 4dB, thus
decrease 4dB.
Therefore, according to the general judgement on power control, 15dB
should be decreased.
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
32/33
Page32Copyright 2006 Huawei Technologies Co., Ltd. All rights reserved.
Exercise Exercises for HW II power control
Answer .
After the implementation of step 1 power control, the receiving
level becomes: -55dBm-15dB= -70dBm, Suppose the quality reach
already in level 1 here.
First: the receiving level value is between -80dBm~-60dBm,
neednt adjust.
Second: the receiving quality value is between 0 and 2, neednt
adjust.
Therefore, the uplink stable receiving level =-70dBm.
-
8/14/2019 Microsoft Power Point - 5 OMF010003 Power Control ISSUE1
33/33