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Operator Logo
ZGO-04-02-001 Dynamic BTS
Power Control
Feature Guide
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ZGO-04-02-001 Dynamic BTS Power Control
ZTE Confidential Proprietary © 2010 ZTE CORPORATION. All rights reserved. I
ZGO-04-02-001 Dynamic BTS Power Control
Version Date Author Approved By Remarks
V1.00 2010-10-30 Not open to the Third Party
© 2010 ZTE Corporation. All rights reserved.
ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to bedisclosed or used without the prior written permission of ZTE.
Due to update and improvement of ZTE products and technologies, information in this document issubjected to change without notice.
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ZGO-04-02-001 Dynamic BTS Power Control
ZTE Confidential Proprietary © 2010 ZTE CORPORATION. All rights reserved. II
TABLE OF CONTENTS
1
Feature Attribution ......................................................................................... 1
2
Overview ......................................................................................................... 1
2.1
Feature Introduction .......................................................................................... 1
2.2
Correlation with Other Features ........................................................................ 2
3
Technical Description .................................................................................... 2
4
Parameters and Configurations................................................................... 15
4.1
Parameter List ................................................................................................ 15
4.2
Parameter Configurations ............................................................................... 25
5
Related Counters and Alarms ...................................................................... 32
5.1
Related Counters ............................................................................................ 32
5.2
Related Alarms ............................................................................................... 33
6 Engineering Guide ........................................................................................ 33
6.1
Application Scenarios ..................................................................................... 33
6.2
Configuration Description................................................................................ 33
6.3
Network Impact ............................................................................................... 33
7
Abbreviation .................................................................................................. 34
8
Reference Document .................................................................................... 34
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FIGURES
Figure 3-1 Power Control Flow Chart ................................................................................... 4
Figure 3-2 Power control samples averaging process with windows size set as 6 ................ 5
Figure 3-3 First averaging sample ........................................................................................ 7
Figure 3-4 Second averaging sample ................................................................................... 7
Figure 3-5 Third averaging sample ....................................................................................... 8
Figure 3-6 Fast averaging process ....................................................................................... 9
Figure 3-7 Power Control Strategy ..................................................................................... 12
Figure 4-1 Power Control1 ................................................................................................. 26
Figure 4-6 Others ............................................................................................................... 31
TABLES
Table 3-1 Power Control Strategy ...................................................................................... 10
Table 3-2 Dynamic Power Definition .................................................................................. 15
Table 4-1 Parameter List .................................................................................................... 15
Table 4-2 Level Values Corresponding to Downlink Signal Strength Threshold ................. 29
Table 4-3 BER Corresponding to Downlink Signal Quality Threshold ................................. 30
Table 5-1 Related counters ................................................................................................ 32
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ZTE Confidential Proprietary © 2010 ZTE CORPORATION. All rights reserved. II
Document
Title
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ZGO-04-02-001 Dynamic BTS Power Control
ZTE Confidential Proprietary © 2010 ZTE CORPORATION. All rights reserved. 1
1 Feature Attribution
iBSC Version: [iBSC V6.20]
BTS Version: [For all BTS versions based on SDR platform]
Property: [Optional]
Related Network Elements and Requirements:
NE Name Related or Not Special Requirements
MS √
BTS √
BSC √
MSC -
MGW -
SGSN -
GGSN -
HLR -
Dependent Function: [None]
Exclusive Function: [None]
Note: [None]
2 Overview
2.1 Feature Introduction
Power control is important for spectrum efficiency as well as for power consumption
efficiency in a cellular system. Dynamic BTS Power Control can dynamically adjust the
BTS output power. The control algorithm uses the signal strength and quality information
in the measurement reports which are reported by the MS.
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Dynamic BTS Power Control can properly adjust the output power of BTS, thus
decreasing the interference in the network.
2.2 Correlation with Other Features
The increase downlink level threshold (PcDlInclLevThs) of BTS power control should be
set higher than downlink power level threshold (HoDlLevThs),of downlink level based
handover and the increase downlink quality threshold (PCDLINCLQUALTHSThs) of BTS
power control should be set smaller than downlink quality level threshold (HoDlQualThs)
of downlink quality based handover. The purpose is to enhance the level or quality of CS
call as much as possible with power control before handover is triggered as the last way.
Attention: Power control and handover are controlled by BTS and BSC separately without
interaction with each other which means both of them will be triggered when the
thresholds of both algorithms are met because of fast signal attenuation.
Other related features include: ZGB-04-02-002 Static BTS Power Control and
ZGO-04-02-002 Dynamic MS Power Control .
3 Technical Description
BTS Power control is an important method for radio link control. The dynamic BTS power
control function with parameter PwrControlDl allows BSS to conduct dynamic control
over the output power of BTS. The transmission power of BTS is adjusted according to
an overall judgment based on downlink level and quality in the downlink measurement
report.
Power control is based on the following basic principles:
Power will be decreased appropriately when the level or quality is higher than the
expectation;
Power will be increased appropriately when the level or quality is lower than the
expectation;
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Both level and quality factors should be taken into overall consideration to make power
control more accurate and effective.
Although it is the network operators that determine whether to adopt the downlink power
control function, all BTSs must support this function. According to the specifications, BTS
must have 15 steps of dynamic power adjustment with 2dB/per step which means the
dynamic power adjustment range is 30dB.
Figure 3-1 shows ZTE’s power control flow chart.
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Figure 3-1 Power Control Flow Chart
Step1:BTS receives a
measurement report from MS
BEGIN
Step2:BTS saves the
measurement report from MS
Step3:BTS processes theoriginal measurement data
from MS
Step4:BTS sorts and works
out statistics of the
average date of MS
Step5:BTS power control
strategies
Step6:determining the BTS
power control step
Step7:implementing BTS
power control and resetting
power control data
END
The steps are detailed as follows:
Step 1: BTS receives a measurement report from MS.
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The downlink measurement reports are sent through the SACCH in the measurement
report message. The measurement report message contains the measurement results
about the current dedicated channels and adjacent cells.
Step 2: BTS saves the measurement report from MS.
Downlink power control algorithm will extract the downlink reception level grade and
reception quality grade of the current channel from the measurement report message
and put these two grade values into their respective original cyclic queues.
Step 3: BTS processes the original measurement data from MS.
When the number of stored level and quality queues reaches their respective averaging
window size set with parameter PcDlLevWindows/PcDlQualWindows, Averaging process
will be implemented with considering the weight factor set with parameter
PcDlLevWeight/PcDlQualWeight .
For the step 1 to step 3, please check in the figure 3-2:
Figure 3-2 Power control samples averaging process with windows size set as 6
Signal Level/Quality information got from MR1
A v e r a g e
DTx=0
Weight=2
DTx=1
Weight=1
A v e r a g e S i gn al l e v e l
/ Q u al i t y
1
DTx=0
Weight=2
DTx=0
Weight=2
DTx=1
Weight=1
DTx=1
Weight=1
Signal Level/Quality information got from MR2
Signal Level/Quality information got from MR3
Signal Level/Quality information got from MR4
Signal Level/Quality information got from MR5
Signal Level/Quality information got from MR6
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When the Downlink DTX is used, the proper way is to set the
PcDlLevWeight/PcDlQualWeight larger than 1 which means the measure report with DTX
on will be with weight as 1 and the measure report with DTX off will be with weight as 2 or
3 during the averaging to make sure the none DTX measure report will make more effect
on the final averaging result.
Step 4: BTS sorts and works out statistics of the average data of MS.
When the average value samples reach the threshold N, BTS will check the average
queues and works out statistics on the current level status and quality status (Whether P
sample of N averaging samples is met the threshold).
The level threshold, P and N related parameters are:
PcDLIncLevThsThs/PcDLIncLevThsP/PcDLIncLevThsN and PcDLRedLevThsThs
/PcDLRedLevThsP/PcDLRedLevThsN.
The quality threshold, P and N related parameters are:
PcDLIncQualThsThs/PcDLIncQualThsP/PcDLIncQualThsN and PcDLRedQualThsThs
/PcDLRedQualThsP/PcDLRedQualThsN.
BTS power control will use the sliding windows method to generate the N averaging
value shown in the figure 3-3 to figure 3-5 with the example that windows size is 6
and P/N is 3/3:
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Figure 3-3 First averaging sample
Level/Quality information got from MR1
Level/Quality information got from MR2
Level/Quality information got from MR3
Level/Quality information got from MR4
Level/Quality information got from MR5
Level/Quality information got from MR6
Level/Quality information got from MR7
Level/Quality information got from MR8
Average Level/Quality 1
Average Level/Quality 2
Average Level/Quality 3
P=3 and N=3
Figure 3-4 Second averaging sample
Level/Quality information got from MR1
Level/Quality information got from MR2
Level/Quality information got from MR3
Level/Quality information got from MR4
Level/Quality information got from MR5
Level/Quality information got from MR6
Level/Quality information got from MR7
Level/Quality information got from MR8
Average Level/Quality 1
Average Level/Quality 2
Average Level/Quality 3
P=3 and N=3
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Figure 3-5 Third averaging sample
Level/Quality information got from MR1
Level/Quality information got from MR2
Level/Quality information got from MR3
Level/Quality information got from MR4
Level/Quality information got from MR5
Level/Quality information got from MR6
Level/Quality information got from MR7
Level/Quality information got from MR8
Average Level/Quality 1
Average Level/Quality 2
Average Level/Quality 3
P=3 and N=3
Before the averaging, only the measurement sample amount reaches the window
size can trigger the averaging. Sometimes it will cost time because the measure
report store queuing will be cleared and reset after power control per time and new
measurement reports should be re-gathered again.
To fasten the power control process and meet the requirement on the prompt BTS
power adjustment especially in the fast moving environment, the Fast average
indication (FastAve) is used which means the the first averaging will be done immediately
on the first MR received and the second averaging will be done on two MRs when the
second MR is received.
For the detail explanation, please check it in the figure 3-6 as following:
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Figure 3-6 Fast averaging process
Level/Quality information got from MR1 Average Level/Quality 1
P=3 and N=3
Level/Quality information got from MR1Average Level/Quality 1
Level/Quality information got from MR2 Average Level/Quality 2
Level/Quality information got from MR1
Average Level/Quality 1
Level/Quality information got from MR2Average Level/Quality 2
Level/Quality information got from MR3 Average Level/Quality 3
Step 5: BTS power control strategies.
According to the statistic results of the level and quality status, the BTS power control
strategies are shown in the Table 1. In this table:
Level status = 0: the level grade is normal level status (between the upper and lower limit
of the expected level);
Level status = 1: the level grade is low level status (lower than the lower limit of the
expected level);
Level status = 2: the level grade is high level status (higher than the upper limit of the
expected level);
Quality status = 0: the reception quality is normal BER (between the upper and lower limit
of the expected quality);
Quality status = 1: the reception quality is low BER (lower than the lower limit of the
expected quality);
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Quality status = 2: the reception quality is high BER (higher than the upper limit of the
expected quality).
Please check the power control strategy sumary list in table 3-1 shown as following:
Table 3-1 Power Control Strategy
No Level Status Quality Status Conclusion
1 0 0 Keep the original power
2 0 1Decrease the transmission power (due to
quality)
3 0 2 Increase the transmission power (due toquality)
4 1 0 Increase the transmission power (due to level)
5 1 1 Increase the transmission power (due to level)
6 1 2Increase the transmission power (due to
quality)
7 2 0 Decrease the transmission power (due to level)
8 2 1 Decrease the transmission power (due to level)
9 2 2Increase the transmission power (due to
quality)
Detailed explanations for each case mentioned in table 1 Power Control Strategy:
No 1:
When the level grade is normal level status, and the reception quality is normal BER, the
selected power control scheme is to keep the original power.
No 2:
When the level grade is normal level status, and the reception quality is low BER, the
selected power control scheme is to decrease the transmission power.
No 3:
When the level grade is normal level status, and the reception quality is high BER, the
selected power control scheme is to increase the transmission power.
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No 4:
When the level grade is low level status, and the reception quality is normal BER, the
selected power control scheme is to increase the transmission power.
No 5:
When the level grade is low level status, and the reception quality is low BER, the
selected power control scheme is to increase the transmission power.
No 6:
When the level grade is low level status, and the reception quality is high BER, the
selected power control scheme is to increase the transmission power.
No 7:
When the level grade is high level status, and the reception quality is normal BER, the
selected power control scheme is to decrease the transmission power.
No 8:
When the level grade is high level status, and the reception quality is low BER, the
selected power control scheme is to decrease the transmission power.
No 9:
When the level grade is high level status, and the reception quality is high BER, the
selected power control scheme is to increase the transmission power.
Above 9 cases can also be descirbed in the figure 3-7 Power Control Strategy show as
following:
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Figure 3-7 Power Control Strategy
No Action
Decrease Power
(Due to quality)
Increase Power
(Due to quality)
Decrease Power
(Due to level)
Decrease Power
(Due to level)
Increase Power
(Due to quality)
Increase Power
(Due to level)
Increase Power
(Due to level)
Increase Power
(Due to quality)
0
7
Quality
-110 -50 dBm
Decrease UL/DL
quality Threshold
Increase UL/DL
quality Threshold
Increase UL/DL
level Threshold
Decrease UL/DL
level Threshold
Step 6: Determining the BTS power control step.
BTS output power will be adjusted according to the dynamic BTS power control strategy.
If the power adjustment step is a fixed value set by parameter PWRINCSTEP or
PWRREDSTEP , such as 2, 4 and 6dB, this is called common power control. When the
parameter DIRapidPcInd is switched on, BTS determines whether the rapid power
control will be used according to the level or quality difference between thresold triggering
power control and measured one.
As an advantage, the rapid power control can decrease the interference of the whole
system and making a fast power control. The power control adjustment range per time by
the rapid power control is no longer a fixed value, but an integral multiple with the cell
parameter PWRINCSTEP or PWRREDSTEP .
For the power adjustment range per time of rapid power control, please refer to the
following rules. Increasing/decreasing level should be judged by some conditions. If
these conditions are not met, common power control will be used.
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Increase the BTS power (due to level):
If LEV_DL + 2* INCREASESTEP < L_RXLEV_DL, there is step adjustment:
STEP = L_RXLEV_DL -LEV_DL,
LEV_DL refers to the current signal level rather than the average value; L_RXLEV_DL
refers to the lower limit of the expected level.
Decrease the transmission power (due to level):
If LEV_DL - 2* DECREASESTEP > U_LEV_DL, there is step adjustment:
STEP = min (PwrDecrLimit, LEV_DL- U_RXLEV_DL)
LEV_DL is the current value rather than the average value; U_LEV_DL refers to the
upper limit of the expected level; PwrDecrLimit idicates the maximum allowed BTS output
power decreasing set on each quality level from 0 to 7 with parameter PwrDecrLimit .
Increase the transmission power (due to quality):
If LEV_DL + 2* INCREASESTEP < L_RXLEV_DL, there is step adjustment:
STEP = max ( (1+max(0,Qa)) * INCREASESTEP , L_RXLEV_DL - LEV_DL )
Otherwise
STEP = (1+max (0,Qa)) * INCREASESTEP
Qa = QUAL_DL - L_RXQUAL_DL; QUAL_DL refers to the current signal quality and
LEV_DL refers to the current signal level, neither of them refers to the average value;
L_RXQUAL_DL refers to the upper limit of the expected quality.
Decrease the transmission power (due to quality):
Power decreasing step caused by signal quality is limited, therefore:
If LEV_DL - 2* DECREASESTEP > U_LEV_DL,
STEP = min (PwrDecrLimit, LEV_DL – U_ RXLEV_DL, (1 + max (0, Qa)) *
DECREASESTEP);
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Otherwise
STEP = DECREASESTEP.
LEV_DL refers to the current signal level rather than the average value; Qa =
U_RXQUAL_DL – AV_QUAL_DL; AV_QUAL_DL refers to the average value of signal
quality.
The difference between the latest measurement report value and the threshold value will
be calculated. If the result exceeds 2 times the power control step value, rapid power
control should be conducted to adjust the measured value directly to the threshold value
at one stroke. If the value does not exceed 2 times the power control step value,
adjustment should be performed by the step defined in common power control.
Step 7: Implementing BTS power control and resetting power control data.
When the power control algorithm is used to figure out the required power, BTS will
modify its transmission power based on this information. Once the BTS output power is
changed, all the measured data and stored queues will be cleared and reset to receive
new mearsurement report for the next power control judgment process.
After each time of power control, a few more measurement reports that still use the
original transmission power or dynamically changing transmission power are likely to be
received, but the level and quality information contained is inaccurate and should be
ignored (other information, like adjacent cell information, is still valid.) Therefore, before
the next power control process starts, several measurement reports that are not accurate
enough will be ignored. The parameter PCMININTERVAL is used to specify a minimum
interval between two power control processes.
ZTE’s dynamic BTS power is divided into 16 levels: 0 to 15. Dynamic power control is an
adjustment based on static power control. Dynamic power takes one level of static power
as its maximum value, named Pn, which can be adjusted downward by up to 15 levels, at
a step of 2dB. For example, if Pn = 45dBm, the power values corresponding to its
dynamic power levels are listed in Table 3-2:
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Table 3-2 Dynamic Power Definition
Dynami
c Level0 1 2 3 4 5 6 7 8 9
1
0
1
1
1
2
1
3
1
4
1
5
Power
(dBm)
4
5
4
3
4
1
3
9
3
7
3
5
3
3
3
1
2
9
2
7
2
5
2
3
2
1
1
9
1
7
1
5
Acutally, even the maximum allowed dynamic power control has 15 levels with 2dB/per
step, it doesn’t mean that the maximum BTS output power can be decreased is Pn-30dB
unconditionally as another parameter Min Power level of BS (BsTxPwrMin) still should be
considered.
BsTxPwrMin is used to define the minimal BTS output power allowed, supposing it is set
as 10 (range is from 0-15 and 2dB/per step), then the minimal BTS output allowed is
Pn-20dB even with 15 levels dynamic power control level.
4 Parameters and Configurations
4.1 Parameter List
Table 4-1 Parameter List
Full name Downlink Rapid power control indication
Abbreviation DIRapidPcInd
Description
This parameter determines the availability of the rapid power control
process. Rapid power control process is an optional process of BSC. It
reduces the interference of the whole BSS radio system and satisfies
the dynamic power control requirement for rapid moving MS.
The amplitude of power control used by rapid power control process
each time is no longer a fixed value, but an integer multiple of cell
parameter power control step (increase and decrease). This parameter
determines the availability of the rapid power control process.
Value Range Yes/No
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Unit None
Default No
Management
Object
Cell
Full name Power control
Abbreviation PwrDecrLimit
Description
This parameter is set for preventing MS from call drop due to fast power
control. It corresponds to different quality level. For example,
PwrDecrLimit [0] determines the maximum power decrease limit for calls
with receiving quality level 0 (Bit Error rate (BER) <0.2%). This
parameter is valid for both uplink and downlink.
This parameter is an array of eight elements, with element length of one
byte. PwrDecrLimit [n] determines the maximum power decrease limit
available for calls with quality level n. The value range of each element
is 0 ~ 38 dB.
Value Range 0 ~ 38
Unit None
Default [24, 22, 20, 18, 16, 14, 12, 10]
Managemen
t
Object
Cell
Full name Report period of measurement for power control
Abbreviation PwrCtrlReportPrd
Description
Power control is performed at BTS side and BSC implements relevant
performance statistics. BTS uses this parameter to decide the periodicity
to send the preprocessed power measurement to BSC as an input for
power control analysis. This parameter is in the unit of SACCH
multi-frame.
Value Range 1 ~ 254
Unit SACCH multiframe
Default 240
Managemen
t
Object
Cell
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Full name Downlink level Sample count
Abbreviation PcDlLevWindow
Description
In GSM system, BSC determines whether to perform power controlaccording to measurement data. BSC uses the average value of
measurement data to avoid adverse influences caused by abrupt
changes in measurement data due to complex radio transmission.
BTS uses this parameter to calculate the window size for the average
value of downlink signal strength, i.e. to calculate the average value of
the number of used samples.
Value Range 1 ~ 31
Unit None
Default 6
Managemen
t
Object
Cell
Full name Downlink level Weight
Abbreviation PcDlLevWeight
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Description
Description: According to GSM Specifications, discontinuous
transmission (DTX) refers to the process in which the system does not
transmit signals in the voice intermittent period during the subscriber
communication process.
In the DTX mode, the measurement data reported to BSC fall into two
types. One is the average of the measurement results of all timeslots in
a
measurement period in the non-DTX mode, and the other is the average
of the measurement results of some special timeslots in a measurement
period in the DTX mode. BSC needs to optionally select one type of
measurement data and use the data to calculate the average value.
The first type of measurement data is more accurate since it is the
average value of measurement results of all timeslots. The second type
of measurement data is less accurate since it is the average value of
measurement results of some timeslots. Thus BSC should use different
weights for the two types of data when averaging the measurement
results.
This parameter determines the weight for the first type of measurement
data when averaging downlink signal strength for power control. Weight
for the second type of measurement data is set to 1 by default.
Value Range 1 ~ 3
Unit None
Default 2
Managemen
t
Object
Cell
Full name Downlink quality Sample Count
Abbreviation PcDIQualWindow
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Description
In GSM system, BSC determines whether to perform power control
according to measurement data. BSC uses the average value of
measurement data to avoid adverse influences caused by abrupt
changes in measurement data due to complex radio transmission.
BTS uses this parameter to calculate the window size for the average
value of downlink signal quality, i.e. to calculate the average value of the
number of used samples.
Value Range 1 ~ 31
Unit None
Default 6
Managemen
t
Object
Cell
Full name Downlink quality Weight
Abbreviation PcDlQualWeight
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Description
Description: According to GSM Specifications, discontinuous
transmission (DTX) refers to the process in which the system does not
transmit signals in the voice intermittent period during the subscriber
communication process.
In the DTX mode, the measurement data reported to BSC fall into two
types. One is the average of the measurement results of all timeslots in
a measurement period in the non-DTX mode and the other is the
average of the measurement results of some special timeslots in a
measurement period in the DTX mode. BSC needs to optionally select
one type of measurement data and use the data to calculate the
average value.
The first type of measurement data is more accurate since it is the
average value of measurement results of all timeslots. The second type
of easurement data is less accurate since it is the average value of
measurement results of some timeslots. Thus BSC should use different
weights for the two types of data when averaging the measurement
results.
This parameter determines the weight for the first type of measurement
data when averaging downlink signal quality for power control.
Weight for the second type of measurement data is set to 1 by default.
Value Range 1 ~ 3
Unit None
Default 2
Managemen
t
Object
Cell
Full name Fast average indication
Abbreviation FastAvg
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Description
Network may not perform handover or power control if less
measurement data is available during call process. The average
calculating process for these processes is enabled only when the
measured data reaches a certain window size.
Common average process does not take place, for the five measured
values BSC receives. BSC directly calculates the average of the 5
measured values if the fast average process is adopted.
There are three cases resulting in insufficient data for calculating the
average value, that is, call establishment period, after handover and
after power control. After performing power control once, former
measured values are discarded in
situations where they could result in an error control (measured values
without the influence on handover control are still existing).
In addition, old measured values are discarded after the handover has
occurred keeping it from causing error control (the forward and
backward cells are in the same BSC).
Value Range Yes/No
Unit None
Default No
Managemen
t
Object
Cell
Full name Increase downlink level Threshold, Value P, and Value N
AbbreviationPcDLInclLevThsThs/PcDLInclLevThsP/PcDLIncl-
LevThsN
Description
According to GSM specifications, power control decisions depend uponreceived average value series of uplink signal strength.
The decision process is as follows: For the latest N average values of
downlink signal strength, if P of the N values fall below relevant
threshold
value, increase BTS (downlink) transmission power to improve the
downlink signal quality.
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Value Range
Increase downlink level can be divided into four kinds: FR, HR, AMR FR,
and AMR HR.
Threshold: 0 ~ 63; Value P: 1 ~ 31; Value N: 1 ~ 31
Unit None
Default [26, 3, 4]
Managemen
t
Object
Cell
Full name Decrease downlink level Threshold, Value P, and Value N
Abbreviation PCDLREDLEVTHSThs/PCDLREDLEVTHSP/PCDLREDLEVTHSN
Description
According to GSM specifications, power control decisions depend uponreceived average value series of uplink signal strength.
The decision process is as follows: For the latest N average values of
downlink signal strength, if P of the N values fall below relevant
threshold value, increase BTS (downlink) transmission power to improve
the downlink signal strength.
Value Range
Decrease downlink level can be divided into four kinds: FR, HR, AMR
FR, and AMR HR.
Threshold: 0 ~ 63; Value P: 1 ~ 31; Value N: 1 ~ 31
Unit None
Default [34, 3, 4]
Managemen
t
Object
Cell
Full name Increase downlink quality Threshold, Value P, and Value N
AbbreviationPCDLINCLQUALTHSThs/PCDLINCLQUALTHSP/PCDLINCLQUALTHS
N
Description
According to GSM specifications, power control decisions depend upon
received average value series of uplink signal strength.
The decision process is as follows: For the latest N average values of
downlink signal quality, if P of the N values rise above relevant threshold
value, increase BTS (downlink) transmission power to improve the
downlink signal quality.
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Value Range
Increase downlink quality can be divided into four kinds: FR, HR, AMR
FR, and AMR HR.
Threshold: 0 ~ 7; Value P: 1 ~ 31; Value N: 1 ~ 31
Unit None
Default [2, 3, 4]
Managemen
t
Object
Cell
Full name Decrease downlink quality Threshold, Value P, and Value N
AbbreviationPCDLREDQUALTHSThs/PCDLREDQUALTHSP/PCDLREDQUALTHS
N
Description
According to GSM specifications, power control decisions depend upon
received average value series of uplink signal strength.
The decision process is as follows: For the latest N average values of
downlink signal quality, if P of the N values fall below relevant threshold
value, reduce BTS (downlink) transmission power to improve the
downlink signal quality.
Value Range
Decrease downlink quality can be divided into four kinds: FR, HR, AMR
FR, and AMR HR.Threshold: 0 ~ 7; Value P: 1 ~ 31; Value N: 1 ~ 31
Unit None
Default [0, 3, 4]
Managemen
t
Object
Cell
Full name Power increasing step.
Abbreviation PwrIncStep_0 ~ PwrIncStep_3
DescriptionIt describes increase step, the value of each power control variation. It
applies to both uplink and downlink directions.
Value Range
Power increase step can be divided into four kinds: FR, HR, AMR FR,
and AMR HR.
Value range is 2, 4, and 6.
Unit dB
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DefaultIt can be divided into four kinds: FR, HR, AMR FR, and AMR HR. 2 by
default.
Managemen
t
Object
Cell
Full name Power decreasing step.
Abbreviation PwrRedStep_0 ~ PwrRedStep_3
DescriptionIt describes decrease step, the value of each power control variation. It
applies to both uplink and downlink directions.
Value Range
Power decrease step can be divided into four kinds: FR, HR, AMR FR,
and AMR HR.
Value range is 2 and 4.
Unit dB
DefaultIt can be divided into four kinds: FR, HR, AMR FR, and AMR HR. 2 by
default.
Managemen
t
Object
Cell
Full name Downlink power control allowed
Abbreviation PwrControlDl
DescriptionThis parameter determines whether to enable or disable BTS downlink
power control in the cell.
Value Range Yes/No
Unit None
Default No (Set YES to activate this feature)
Managemen
t
Object
Cell
Full name Min Power level of BS
Abbreviation BsTxPwrMin_0 ~ BsTxPwrMin_3
Description
This parameter controls the transmission power during communication
between MS and BTS. SACCH carries the command with 2 header
bytes information (power control byte and timing advance byte) from
BSC to BTS. When BSC performs power control, this parameter
determines the BTS’s minimum transmission power in the cell.
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Value Range
MIN power level of BS can be divided into four kinds: FR, HR, AMR FR,
and AMR HR.
Value range is 0 ~ 15.
The maximum power level of BTS is Pn.
0: Pn;
1: Pn-2 dB;
……
15: Pn-30 dB
Unit None
DefaultIt can be divided into four kinds: FR, HR, AMR FR, and AMR HR. 10 by
default.
Managemen
t
Object
Cell
Full name MIN interval of power control
Abbreviation PcMinInterval_0 ~ PcMinInterval_3
Description
This parameter specifies the minimum interval of power control. Usually,
MS still sends two measurement reports with the original power to BSC
after enabling the power control. Signal level information contained in
the reports is inaccurate and can be ignored (information such asadjacent cell information is still valid). Thus a minimum interval of power
control is needed and signal level information during the interval can be
ignored.
Value Range
MIN interval of power control can be divided into four kinds: FR, HR,
AMR FR, and AMR HR.
Value range is 1 ~ 32.
Unit SACCH multiframe
Default
It can be divided into four kinds: FR, HR, AMR FR, and AMR HR. 2 by
default.
Managemen
t
Object
Cell
4.2 Parameter Configurations
Enter the configuration management section.
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1. In the navigation tree, click the drop-down menu of the cell to be configured, and
double-click Power control, as shown in Figure 4-1.
Figure 4-1 Power Control1
2. Set Downlink rapid power control indication and Power control levels max
descending value in Power control tab of Power control menu to choose whetherperform Rapid power control and adopt restricting conditions of rapid power control, as
shown in Figure 4-2:
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Figure 4-2 Power Control1 zoom in
Set following parameters in Power survey tab in Power control menu to choose powercontrol decision algorithm related parameters:
Report period of measurement for power control
Downlink level sample count
Downlink level sample weight
Downlink quality sample count
Downlink quality sample weight
Survey section is shown in Figure 4-3:
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Figure 4-3 Power Survey
Set following parameters in Power adjust threshold tab in Power control menu to
choose power control decision criteria threshold.
Increase downlink level of FR (Ths, P and N)
Increase downlink level of FR (Ths, P and N)
Increase downlink level of AMR FR (Ths, P and N)
Increase downlink level of AMR HR (Ths, P and N)
Decrease downlink level of FR (Ths, P and N)
Decrease downlink level of FR (Ths, P and N)
Decrease downlink level of AMR FR (Ths, P and N)
Decrease downlink level of AMR HR (Ths, P and N)
Increase downlink quality of FR (Ths, P and N)
Increase downlink quality of FR (Ths, P and N)
Increase downlink quality of AMR FR (Ths, P and N)
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Increase downlink quality of AMR HR (Ths, P and N)
Decrease downlink quality of FR (Ths, P and N)
Decrease downlink quality of FR (Ths, P and N)
Decrease downlink quality of AMR FR (Ths, P and N)
Decrease downlink quality of AMR HR (Ths, P and N)
Power adjust threshold is shown in Figure 4-4:
Figure 4-4 Power adjust threshold
Downlink received signals strength can be divided into 64 grades, ranging from 0 to 63,
which are corresponding to different levels respectively. 0 refers to the lowest received
signal level, 63 means the highest. Corresponding level values is shown in Table 4-2.
Table 4-2 Level Values Corresponding to Downlink Signal Strength Threshold
Threshold Level Value (dBm)
0 < -110
1 -110 ~ -109
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2 -109 ~ -108
… …
61 -50 ~ -49
62 -49 ~ -48
63 > -48
Downlink received signals quality can be divided into 8 grades, ranging from 0 to 7, which
are corresponding to different Bit Error Ratio (BER) respectively. 0 refers to the lowest
received signal BER, 7 means the highest. Corresponding BER values is shown in Table
4-3.
Table 4-3 BER Corresponding to Downlink Signal Quality Threshold
Quality BER
0 BER<0.2%
1 0.2%<BER<0.4%
2 0.4%<BER<0.8%
… …
6 6.4%<BER<12.8%
7 12.8%<BER
In Others tab of Power control menu, set following parameters to choose whether to
power control and adopt restricted conditions of this feature.
● FR power increasing step
● HR power increasing step
● AMR FR power increasing step
● AMR HR power increasing step
● FR power decreasing step
● HR power decreasing step
● AMR FR power decreasing step
● AMR HR power decreasing step
● Downlink power control
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● FR BS MIN power level
● HR BS MIN power level
● AMR FR MIN power level of BS
● AMR FR MIN power level of BS
● FR MIN interval of power control
● HR MIN interval of power control
● AMR FR MIN interval of power control
● AMR HR MIN interval of power control
Others is shown in Figure 4-6:
Figure 4-2 Others
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5 Related Counters and Alarms
5.1 Related Counters
Table 5-1 Related counters
Counter ID What It Counts
C901320005 Number of normal increases of BS power due to DL signal level
C901320006 Number of rapid increase in BTS power due to DL signal level
C901320007 Number of normal decrease of BS power due to DL signal level
C901320008 Number of rapid decrease in power BTS due to DL signal level
C901320013Number of normal increases of BS power due to DL signal
quality.
C901320014 Number of rapid increase in BTS power due to DL signal quality
C901320015 Number of normal decrease of BS power due to DL signal quality
C901320016 Number of rapid decrease in BTS power due to DL signal quality
C901320019
Total value of each result of regular scanning of BS utilization
power
C901320020 Number of regular scanning and sampling of BS utilization power
C901320021 Total value of power scans of DL signal level
C901320022 Number of power scans of DL signal level
C901320025 Total value of power scans of DL signal quality
C901320026 Number of power scans of DL signal quality
C901320031 Maximum value obtained in regular scan of DL signal level
C901320032 Minimum value obtained in regular scan of DL signal level
C901320033 Sum of Periodic BS Power (TCH/F) Search Result
C901320034 Periodic BS Power (TCH/F) Search Times
C901320035 Sum of Periodic BS Power (TCH/H) Search Result
C901320036 Number of Periodic BS Power (TCH/H) Search
C901320037 Sum of Periodic BS Power (SDCCH) Search Result
C901320038 Number of Periodic BS Power (SDCCH) Search
C901320039 Sum of Periodic DL Signal Level (TCH/F) Search Result
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C901320040 Number of Periodic DL Signal Level (TCH/F) Search
C901320041 Sum of Periodic DL Signal Level (TCH/H) Search Result
C901320042 Number of Periodic DL Signal Level (TCH/H) Search
C901320043 Sum of Periodic DL Signal Level (SDCCH) Search Result
C901320044 Number of Periodic DL Signal Level (SDCCH) Search
5.2 Related Alarms
None
6 Engineering Guide
6.1 Application Scenarios
This feature suits for all scenarios.
6.2 Configuration Description
This feature does not involve iBSC and BTS hardware configuration adjustment.
6.3 Network Impact
Influence on network:
Activation of dynamic BTS power control can reduce BTS transmission power with stable
downlink signal strength, aiming at decreasing intra-network co-channel and
adjacent-frequency interference, lowering BTS power consumption.
Using dynamic BTS power control with reasonable parameter setting can provide the
following benefits:
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ZGO-04-02-001 Dynamic BTS Power Control
Decrease intra-network co-channel and adjacent-frequency interference, improve
network KPI, reduce TCH call drop, enhance handover success rate;
Lower BTS power consumption;
Influence on network element:
This feature does not affect capacity of iBSC and BTS.
7 AbbreviationAbbreviations Full Characteristics
3GPP 3rd Generation Partnership Project
BSC Base Station Controller
BTS Base Transceiver Station
MR Measure Report
SACCH Slow Associated Control Channel
8 Reference Document
[None]