Document No. Product name CBSCV100R003C03 Applicable for Customer Product name
Drafted by Document version V1. 2
CDMA1X BSS Network Planning Parameter Configuration Guide
Prepared by: Network planning Dept. Date: August, 2004
Reviewed by: Network planning Dept. Date: August,2004
Reviewed by: Date:
Approved by: Date:
Huawei Technologies Co., Ltd. All rights reserved
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Table of Contents 1. FORWARD.................................................................................................................................................. 7
1.1 ABOUT THIS DOCUMENT...................................................................................................................... 7 1.2 TABLE OF PARAMETERS RELATED TO NETWORK PLANNING............................................................ 8
2. FORWARD POWER ALLOCATION PARAMETERS ................................................................... 10 2.1 SECTOR CARRIER PARAMETERS (PILOT) ........................................................................................ 10 2.2 PILOT CHANNEL PARAMETERS (PILOT_CH)................................................................................... 12 2.2 SYNC CHANNEL PARAMETERS (SYNC_CH) .................................................................................... 13 2.3 PAGING CHANNEL PARAMETERS (P_CH) ......................................................................................... 14 2.4 QUICK PAGING CHANNEL PARAMETERS (QP_CH) ......................................................................... 15
3. RECOMMENDATIONS FOR POWER CONTROL PARAMETER CONFIGURATION....... 19 3.1 DESCRIPTIONS OF SPECIAL REPRESENTATION................................................................................ 19
3.1.1 Reverse Outloop Set Value................................................................................................... 19 3.1.2 Forward Channel Transmit Power ...................................................................................... 20 3.1.3 Eb/Nt Set Value of Forward Fast Power Control ............................................................. 21 3.1.4 Representation of FER........................................................................................................... 21
3.2 BSC-LEVEL POWER CONTROL PARAMETERS (BSCPWR) ............................................................ 21 3.3 REVERSE CLOSED LOOP POWER CONTROL PARAMETERS (RCLPC) ........................................... 26 3.4 FORWARD SLOW POWER CONTROL PARAMETERS (FSLOWPC)................................................... 45 3.5 FORWARD EIB POWER CONTROL PARAMETERS (FEIBPC) .......................................................... 55 3.6 FORWARD FAST POWER CONTROL PARAMETERS (FFASTPC)...................................................... 59 3.7 TARGET FER (FER) ........................................................................................................................... 79
4. HANDOFF PARAMETERS .................................................................................................................. 85 4.1 MODULE HANDOFF PARAMETER (MHOPARA) .............................................................................. 85 4.2 HANDOFF PARAMETERS (HOPARA) ................................................................................................ 94 4.3 PILOT HANDOFF ALGORITHM SWITCH PARAMETERS (PHOALG) ............................................... 107 4.4 SAME-FREQUENCY HARD HO PARAMETERS (HHOSAMEFREQPARA) ................................. 110 4.5 CANDIDATE PILOT SEARCH CONTROL PARAMETERS (CFSCPARA)........................................... 113 4.6 MOBILE ASSISTED HARD HANDOFF PARAMETER (HHOMAHHOPARA) ................................. 121 4.7 HANDDOWN HARD HANDOFF PARAMETER (HHOHANDDOWNPARA)..................................... 125 4.8 DIRECT HARD HANDOFF PARAMETER (HHODIRECTPARA) .................................................... 127 4.9 PILOT BEACON HARD HANDOFF PARAMETERS (HHOPILOTBEACONPARA) ........................ 128 4.10 PILOT MEASUREMENT REQUEST PARAMETERS (PMROPARA) .................................................. 130
5. CHANNEL ASSIGNMENT .................................................................................................................... 133 5.1 CHANNEL INFORMATION (CH_INFO) ............................................................................................... 133 5.2 SCH ASSIGN PARAMETERS (SCH_PARA) .................................................................................... 143 5.3 CHM MODULE PARAMETERS (MCHM)............................................................................................ 159 5.4 SERVICE REDIRECTION PARAMETERS (SR_CFG) .......................................................................... 182
6. SYSTEM MESSAGES ........................................................................................................................... 187 6.1 SYNCHRONIZATION CHANNEL MESSAGE (SCHM) ............................................................................ 187 6.2 SYSTEM PARAMETERS MESSAGE (SPM) ............................................................................................ 190 6.3 SYSTEM MESSAGE CONTROL PARAMETERS (SYS_MSG_CTRL_INFO) ....................................... 203 6.4 ACCESS PARAMETER MESSAGE (APM) .............................................................................................. 207 6.5 ACCESS CHANNEL PARAMETERS (A_CH)........................................................................................... 221 6.6 EXTENDED SYSTEM PARAMETER MESSAGE (ESPM) ....................................................................... 223 6.7 NEIGHBOUR LIST MESSAGES (NLM) .................................................................................................. 237 6.8 GLOBAL SERVICE REDIRECTING MESSAGES (GSRDM) .................................................................. 238 6.9 EXTENDED CDMA CHANNEL LIST MESSAGES (CCLM) .................................................................. 242 6.10 EXTENDED GLOBAL SERVICE REDIRECTION MESSAGES (GSRDM)............................................ 244 6.11 GLOBAL NEIGHBOR LIST MESSAGE (GNLM) .................................................................................. 247
7. BTS CELL ATTRIBUTE PARAMETERS ........................................................................................... 251
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7.1 SET BTS REVERSE CHIP PROCESSING PARAMETERS (SET_BTSREVCHP) ........................... 252 7.2 SET BTS CELL PARAMETERS (SET_BTSCELLPARA) ............................................................... 256
8. LOAD CONTROL PARAMETERS ................................................................................................... 261 8.1 FORWARD LOAD CONTROL PARAMETERS (FWD_LOAD_CTRL_PARA) .................................. 261 8.2 REVERSE LOAD CONTROL PARAMETERS (REV_LOAD_CTRL_PARA) .................................... 269 8.3 ACCESS LOAD CONTROL PARAMETERS (ACH_LOAD_CTRL_PARA)....................................... 275 8.4 SERVICE RESOURCE MANAGEMENT PARAMETERS (BSCRSM).................................................. 278
9. TCP OPTIMIZATION PARAMETERS............................................................................................ 280
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Table of Table Descriptions
TABLE 2-2 QUICK PAGING CHANNEL POWER OFFSET ......................................................................................... 17 TABLE 3-1 TARGET FER ..................................................................................................................................... 21 TABLE 4-1 SEARCH WINDOW SIZE....................................................................................................................... 94 TABLE 4-2 HANDOFF REMOVAL TIMER EXPIRATIONS ........................................................................................ 100 TABLE 4-3 THE RELATION BETWEEN PARAMETER VALUE AND PERIOD............................................................. 120 TABLE 6-5 REDIRECTION ACCESS OVERLOAD LEVEL........................................................................................ 239 TABLE 6-6 REDIRECTION RECORD TYPES ......................................................................................................... 242 TABLE 6-9 SEARCH MODES ............................................................................................................................... 247 TABLE 7-3 MEANINGS OF VALUES OF THE PARAMETER.................................................................................... 261
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CDMA1X BSS Network Planning Parameter Configuration Guide
Keywords: cdma2000, BSS, radio resource management, forward channel power distribution, power control algorithm, handoff algorithm parameter, channel
assignment, system message and BTS cell attribute parameter, load control
parameter, and TCP optimization parameter.
Abstract: This document gives an in-depth principle description of the relevant parameters in cdma2000 network planning, suggestions on parameter
configurations, and advantages & disadvantages of different
configurations. It provides references for network optimization engineers
to make the best of these radio resource management algorithms to
optimize the network coverage, network capacity and performances of
traffic measurement indices. The specific parameters include forward
channel power distribution, power control algorithm, handoff algorithm,
channel assignment, system message and BTS cell attribute.
Abbreviations list: Abis interface between BTS and BSC
BTS Base Tranceiver System
BSC Base Station Controller
CDMA Code Division Muti Access
ECAM Extended Channel Assignment message
Ec/Io Pilot energy accumulated over one PN chip period (Ec)
to the total power spectral density
(Io) in the received bandwidth
Ec/Ior EIB Erase Indication Bit
ESCAM Extended Supplemental Channel Assignment Message
FCH Fundamental Channel
FER Frame Error Ratio
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FMR Frame Processing Board
FW TFC Forward Traffic Channel
MS Mobile Station
NUM_RSCCH Number of Reverse Supplemental Code channel
OMU Operation Maintenance Unit
PMRM Power Measurement Report Message
RC Radio configuration
Rx Received Power
RV TFC Reverse Traffic Channel
SCH Supplemental Channel
SCCH Supplemental Code Channel
SPU Signal Processing Unit
SDU Selection/Distribution Unit
Tx Transmit Power
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[Announcement]:
This guide is used by Huawei customer of relevant products. The customer must
abide by non-disclosure agreement and illegal transfer and retransmission are
prohibited. Huawei reserves the copyrights.
1. Forward
1.1 About this Document In this guide, the corresponding BSC version is 100R003C03
The fields about parameters in this guide are shown below:
[Type] This field specifies the type of a parameter: An algorithm parameter or a Um
interface parameter. For a Um interface parameter, the system messages that
contains the parameter are also given.
[Range and unit] This field specifies the range of the parameter. The value range is closely
related to the data structure.
[Operating range] This field suggests the allowable adjustment range of the parameter in
practice. Modify the parameter within the above available range during the network
optimization.
[Recommended value] It is a commonly used value, but not always applicable in any case. In
combination with the practical requirement, refer to the description of Setting
tradeoffs to define the value of the parameter. If the default value is inconsistent
with recommended value in this guide, the recommended value prevails.
[Setting tradeoffs] This field means the effect that will be caused if the value of the parameter
increases or decreases on the basis of the recommended value.
This guide only provides references for parameter setting.
The representations and conversion methods between parameters related to
power control and forward power distribution are all listed in 3.1. The symbol Ec/Io is
the same as Ec/Io, so does for Eb/Nt and Eb/Nt.
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1.2 Table of Parameters Related to Network Planning
SN Type SQL table name Configuration items Dynamic
configuration command
1 Sector carrier gain parameter
PILOT RF gain and sector gain MOD CDMACH
2 PILOT_CH Pilot Channel Gain MOD PLTCH 3 SYNC_CH Sync Channel Gain MOD SYNCH
4 P_CH Paging Channel Gain (configured according to paging channel No.) and Broadcast MODE
MOD PCH
5
Common channel
parameter
QP_CH
Number of Quick Paging Channels, Quick Paging Channel Rate, CCI Modulation Symbol Relative Power Level, and Relative Power
Level of PI Modulation Symbol
MOD QPCH
6 BSCPWR BSC-level power control parameters MOD BSCPWR
7 RCLPC Reverse Closed Loop Power Control Parameters
MOD RCLPC
8 FSLOWPC Forward Slow Power Control Parameters MOD FSLOWPC
9 FEIBPC Forward EIB Power Control Parameters MOD FEIBPC
10 FFASTPC Forward Fast Power Control Parameters MOD FFASTPC
11
Power control
FER Target (FER) Configuration MOD FER
12 MHOPARA Inter-BSC Handoff Parameters MOD BSCHO
13 HOPARA Handoff parameters MOD HO
14 PHOALG Pilot Handoff Algorithm Switch Parameters MOD PHOALG
15 CFSCPARA Candidate Pilot Search Control Parameters MOD CFSC
16
Handoff
HHOMAHHOPARA
Mobile Assisted HHO Parameters MOD HHOMA
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17 HHOHANDDOWNPARA Handdown HHO
Parameters MOD HNDDWN
18 HHODIRECTPARA Direct HHO Parameters MOD DRCT
19 HHOPILOTBEACONPARA Pilot Beacon HHO Parameters MOD HHOBPLT
20 PMROPARA Pilot Measurement Request Parameters MOD PMRO
21 SFNBRPILOT Same Frequency HO Relation
ADD NBRCDMACH, RMV NBRCDMACH, LST NBRCDMACH , MOD SFNBRCDMACHP
22 DFNBRPILOT Different Frequency HO Relation
ADD NBRCDMACH, RMV NBRCDMACH, LST NBRCDMACH, MOD DFNBRCDMACHP
23 NBRPILOT Idle HO Relation
ADD NBRCDMACH, RMV NBRCDMACH, LST NBRCDMACH, MOD NBRCDMACHP
24 HHOHANDDOWNTARG HANDDOWN Hard HO Target Carrier
ADD HNDDWNTRG, RMV HNDDWNTRG, LST HNDDWNTRG, MOD HNDDWNTRG
25
HHODIRECTTARG
Direct Hard HO Target Carrier
ADD DRCTTRG, RMV DRCTTRG, LST DRCTTRG, MOD DRCTTRG
26 Channel CH_INFO Channel Information MOD CHINF
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27 SCH_PARA SCH Allocation Parameters
MOD LOADCTRLPAR
A
28 MCHM Module-Level Channel Management Parameters
MOD MCHM
29
management
SR_CFG Service Redirection Parameters MOD SRCFG
30 SCHM Synchronization Channel Messages MOD SYNCMSG
31 SPM System Parameter Messages MOD SPM
32 SYS_MSG_CTRL_INFO Overhead Message Control Parameters
MOD SYSMSGCTRL
33 APM Access Parameter Messages MOD APM
34 A_CH Access Channel parameters MOD ACH
35 ESPM Extended system parameter message table
MOD ESPM
36 NLM Neighbor List Messages MOD NLM
37 GSRDM Global Service Redirection messages MOD GSRDM
38 CCLM Extended CDMA Channel List Messages MOD ECCLM
39 EGSRDM Extended Global Service Redirection Messages
MOD EGSRDM
40
System message
GNLM General Neighbor List Messages MOD GNLM
41 FWD_LOAD_CTRL_PARA Forward Load Control Parameter MOD FLDCTRL
42 REV_LOAD_CTRL_PARA Reverse LOAD control Parameters MOD RLDCTR
43 ACH_LOAD_CTRL_PARA Access Load Control Parameters MOD ALDCTRL
44
Load control
BSCRSM BSC-level RSM Parameters MOD BSCRSM
45 TCP parameter RLP BLOB TCP Optimization Parameter MOD MAPARA
2. Forward Power Allocation Parameters
2.1 Sector Carrier Parameters (PILOT)
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[Command name] MOD CDMACH (Base Station Controller Management\Configuration
Management\Cell Channel Management\Modify Sector Carrier Parameters)
TXGAIN (RF Gain) [Description] This parameter represents the attenuation (in dB) of the radio frequency gain.
[Type] Internal parameter of BTS
[Range and unit] 0~24 dB
[Operating range] 0~20 dB
[Recommended value] 0
[Setting tradeoffs] The value of this parameter depends on the required output power. The
maximum value should not exceed 20dB. To obtain a lower forward output power,
an external attenuator is recommended.
SCTGAIN (Baseband Gain) [Description] This parameter represents the baseband gain.
[Type] Internal parameter
[Range and unit] 0~4095
[Operating range] 500~3200
[Recommended value] 3000
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[Setting tradeoffs] The value of this parameter depends on the required output power. There is an
equation between set value and actual transmit power (P):
P=20*log (SCTGAIN / 3000) + 43 - TXGAIN (dBm).
From the above equation, we can obtain the values in the table below. Currently,
it is recommended to change the forward output power by using an external
attenuator and modifying the radio frequency gain, instead of the baseband gain.
Table 2-1 Relationship between sector gain (baseband gain) and output power Sector gain Output power(dBm)
3000 43
2500 41.4
2000 39.5
1500 37
1000 33.5
500 27.3
2.2 Pilot Channel Parameters (PILOT_CH) [Command name] MOD PLTCH (Base Station Controller Management\Configuration
Management\Algorithm Configuration\Cell Channel Configuration\Modify Pilot
Channel Parameters)
PLTCHGAIN (Pilot Channel Gain)
[Description]
This parameter represents the pilot channel gain in dB. From it, we can get the
percentage of the pilot channel power to the total power.
[Type]
Internal parameter
[Range and unit]
-255~0. (Unit: 0.25 dB) For the conversion method, refer to section 3.1.
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[Operating range]
-40~-21, corresponding to 10% ~30%
[Recommended value]
-28
[Setting tradeoffs]
-63.75 ~ 0dB is represented by 0 ~225. Step: 0.25dB.The ratio of the pilot power to
the total transmit power of sector carrier should be set in consideration of the
capacity and coverage. If the transmit power assigned to the pilot channel is high,
the coverage area will be extended, but the power reserved for the traffic channel will
decrease, so the capacity will decrease, too. When the pilot channel gain is set high,
the forward link and reverse link must be balanced. In the densely-populated urban
areas, where the coverage is not wide, keep the SCTGAIN unchanged, but set a low
pilot channel gain. In this way, not only the coverage can meet the requirement, but
the capacity can increase accordingly.
2.2 Sync Channel Parameters (SYNC_CH)
[Command name] MOD SYNCH (Base Station Controller Management\Configuration Management\Cell
Channel Management -----Modify Sync Channel Parameters)
SYNCHGAIN (Sync Channel Gain)
[Description]
This parameter represents the sync channel gain in dB. From it, we can get the
percentage of the sync channel power to the total power.
[Type]
Algorithm parameter
[Range and unit]
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-63.75 ~0. For the conversion method, refer to section 3.1.
[Operating range]
-80~-61
[Recommended value]
-68
[Setting tradeoffs]
-63.75 ~ 0dB is represented by 0~255. Step: 0.25dB. Sync channel gain = pilot
channel gain -10dB. If this relationship between sync channel gain and pilot channel
gain remains unchanged, the coverage of the sync channel will be roughly the same
as that of the pilot channel
2.3 Paging Channel Parameters (P_CH) [Command name] MOD PCH (Base Station Controller Management\Configuration Management\Cell
Channel Configuration\Modify Channel Parameters)
PCHGAIN (Paging Channel Gain)
[Description]
This parameter is used to set the paging channel gain in dB. From it, we can get the
percentage of the paging channel power to the total power.
[Type]
Algorithm parameter
[Range and unit]
-255~0. For the conversion method, refer to section 3.1.
[Operating range]
The value of this parameter depends on the pilot gain.
[Recommended value]
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Pilot channel gain -1.5dB. For example, if the pilot channel gain is -28, the
recommended value is -34. (Paging rate = 9600, namely, PRAT =0)
[Setting tradeoffs]
It is the ratio of paging channel transmit power to the total transmit power of sector
carrier (in dB). -63.75 ~ 0dB is represented by -255~0. Step: 0.25dB.The paging
channel gain is related to the paging channel rate. When the paging channel rate is
9600, paging channel gain = pilot channel gain - 1.5dB. When the paging channel
rate is 4800, paging channel gain = pilot channel gain - 4.5dB.The PRAT field in
SCHM (sync channel message) is used to configure the paging channel rate. RAT=0,
9600; PRAT=1, 4800
BCMD (Broadcast Mode) [Description] Broadcast mode of paging channel can set multiple slots or cyclic broadcast. When
MS works with slot mode and monitors paging channel, the BTS should send
broadcast message through multiple slots mode or cyclic broadcast mode. Currently,
this product only supports multiple slots mode.
[Type] Um interface
[Range and unit] Multi-timeslot or periodic broadcast
[Operating range] Multi-timeslot
[Recommended value] Multi-timeslot
[Setting tradeoff] None
2.4 Quick Paging Channel Parameters (QP_CH) [Command name]
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MOD QPCH (Base Station Controller Management\Configuration Management\Cell
Channel Configuration\Modify Quick Paging Channel Parameters)
QPCHNUM (Number of Quick Paging Channels)
[Description]
This parameter represents the number of quick paging channels. According to the
descriptions in protocol, when QPCH SUPPORTED is set to 1, this field must be set
to 0. If QPCH SUPPORTED is set to 0, BTS must omit this field.
[Type]
Um interface parameter (ESPM).
[Range and unit]
0~3
[Operating range]
0~3
[Recommended value]
0, which means QPCH is not recommended.
[Setting tradeoffs]
None
QPCHRT (QPCH Date Rate) [Description] This parameter represents quick paging channel rate (the representation of quick
paging channel rate is of the reverse with paging channel rate. For paging channel
rate, 0 stands for 9600bps but 0 stands for 4800bps in quick paging channel rate).
[Type] Um interface parameter (ESPM)
[Range and unit] 0-4800bps, 1-9600 bps
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[Operating range] 0-1
[Recommended value] 0 is set to 4800 bps, which can save power consumption of QPCH.
[Setting tradeoff] None
PWRLEVCFG (Relative Power Level of CCI Modulation Symbol)
[Description]
This parameter represents the quick paging channel transmit power relative to the
pilot channel, when the PWRLEVCFG is transferred on the quick paging channel. If
CCISPT is set to 1, configure the value according to Table 2-2.
Table 2-2 Quick paging channel power offset
PWRLEVPAGE
PWRLEVCFG
(binary)
Transmit Power
Level
(relative to pilot
transmit power)
000 -5
001 -4
010 -3
011 -2
100 -1
101 0
110 1
111 2
(IS20005A Table 3.7.2.3.2.13-3)
[Type] Um interface parameter (ESPM)
[Range and unit]
0~7dB
If the offset is -5dB, the actual range is -5~2dB.
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[Operating range]
0~7
[Recommended value]
5, namely, 0dB
[Setting tradeoffs]
The tradeoff between the capacity of forward link and the standby time of the
MS should be considered when the transmit power of the quick paging channel
is set. If the transmit power of the quick paging channel is set high, the capacity
of the forward link will decrease, but the probability of successful detection of
the MS will be high, so its standby time can be prolonged. Vice versa. If the
load of a sector carrier is light, the value can be set large. If the forward load is
heavy, the value can be set small. The parameter should be set properly in
consideration of the load and the paging success ratio.
PWRLEVPAGE (Relative Power Level of PI Modulation Symbol)
[Description]
This parameter represents the quick paging channel transmit power relative to
the pilot channel, when the PWRLEVPAGE is transferred on the quick paging
channel. If PISPT is set to 1, the value should be configured according to
Table 2-2.Refer to PWRLEVCFG.
[Type]
Um interface parameter (ESPM).
[Range and unit]
0~7dBIf the offset is -5dB, the actual range is -5~2dB.
[Operating range]
0~7
[Recommended value]
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7, namely, 2dB
[Setting tradeoffs]
Usually, this parameter is first set to 2 to ensure the paging success ratio,
and it can be set to a smaller value, depending on the actual requirement. If
the load of a sector carrier is light, the value can be set large. If the forward
load is heavy, the value can be set small. The parameter should be set
properly in consideration of the load and the paging success ratio.
3. Recommendations for Power Control Parameter Configuration
3.1 Descriptions of Special Representation
3.1.1 Reverse Outloop Set Value The representation of the reverse out loop set value in R01 is greatly different from
that in R02.
In R02, the physical meaning of the reverse out loop set value in the database is
Eb/Nt for all rate configurations (RCs).The system automatically converts the Eb/Nt
into the corresponding Ec/Io and then sets it in CSM5000.
Representation of Eb/Nt: 0~255 represents 0~31.875dB.
Eb/Nt = X 0.125 For example, If REVINITSETP is set to 48, the Eb/Nt is 6dB; for RC1, the
corresponding Ec/Io is -15dB, and for RC3, the corresponding Ec/Io is -18.75dB.
In R01, the physical meaning of the reverse out loop set value in the database is
(Eb/Nt-21dB) for all RCs.The system automatically converts the Eb/Nt into the
corresponding Ec/Io for different RCs and then sets it in CSM5000.
Representation of (Eb/Nt-21dB): 0~255 represents -63.75~0dB.
Eb/Nt -21dB= -(255 X)*0.25
For example, If REVINITSETP is set to 203, the Eb/Nt is 8dB; for RC1, the
corresponding Ec/Io is -13dB, and for RC3, the corresponding Ec/Io is -16.75dB.
The correspondence between Eb/Nt and Ec/Io for different RCs is shown below:
RC1: Ec/Io = Eb/Nt - 21
RC2: Ec/Io = Eb/Nt - 21 + 1.75
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RC3: Ec/Io = Eb/Nt - 21 - 3.75
RC4: Ec/Io = Eb/Nt - 21 - 3.5
EbNt = X 0.125
R03 version follows the representation of R02 version.
3.1.2 Forward Channel Transmit Power The transmit power of all forward channels are represented by the gain relative to
the total transmit power of the sector carrier. The transmit powers of pilot channel,
sync channel and paging channel, maximum and minimum transmit powers of
forward traffic channel, and initial transmit power of forward traffic channel are all
represented in this way. Value range of X: 0 ~ 255
Value range of Y: 0 ~ 100%
The relationship between X and Y can be represented by the following equation
- (255-X) 0.25 =10logY Where, X represents the forward channel gain, and Y represents the ratio of the
forward channel power to the total sector power.
1) Given the channel gain, how to calculate the percentage of the channel power
to the total sector power?
For example, if the gain of a channel is 227, then X=227.- (255-227) 0.25=-7dB, and Y=10-0.7100% =19.9%.That is, if the gain X =227, the corresponding channel transmit power is approximately 20% of the total sector power.
2) Given the percentage of the channel power to the total sector power, how to
calculate the channel gain?
For example, if the channel gain accounts for 20% of the total sector power,
that is, Y=0.2, then X= 255 + 4 10logY=227
The above shows the representation and calculation mode of earlier R03
version. In R03 version, the representation and calculation mode are different but
the parameter meanings are the same. The specific representations are as
follows: Value range of X: -255 ~ 0, value range of Y: 0 ~ 100%. X/ 4 = 10 LogY.
Wherein, X represents parameter setting value of forward channel gain and Y
represents the ratio of the forward channel power to the total sector power. For
example, if the channel gain X is - 28, -28/4= -7dB, Y = 10-0.7 =19.9%. That is, if
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the gain X =-28, the corresponding channel transmit power is approximately 20%
of the total sector power. The relationship between corresponding parameter
values in earlier R03 version and R03 version: if the set value in earlier R03
version is A, the value is set to A 255 in R03 version.
3.1.3 Eb/Nt Set Value of Forward Fast Power Control The representation of this type of parameters is relatively simple. The value range of
these parameters is 0~255 and the step is 0.125dB.The parameter value times the
step is the actual value.
For example, if FOR_MAX_FCH_SET_PT is set to 112, the actual value is
1120.125=14dB 3.1.4 Representation of FER FER adopts the representation stipulated in the protocol. See the table below. In the
CDMA system, the quality is closely related with capacity. When the other conditions
remain unchanged, the capacity will decrease if the quality increases (that is, the
FER drops). Otherwise, the capacity will increase if the quality drops (that is, the
allowed FER rises).When the load in a cell is heavy, the capacity of the cell can be
enlarged by raising the FER. That is the so-called load control.
Table 3-1 Target FER
FER (Binary) Frame Error Rate
0 0.2%
00001-10100 0.5% -10% (in units of
0.5%)
10101-11001 11% - 15% (in units of
1.0%)
11010-11110 18% - 30% (in units of
3.0%)
11,111 Reserved
3.2 BSC-Level Power Control Parameters (BSCPWR) [Command name]
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MOD/LST BSCPWR
PWRSYNSW (TCH Power Sync Switch) [Descriptions] Whether to enable power sync function.
[Type] Algorithm parameter
[Range and unit] 0 Yes (ON)
1NO (Off)
[Operating range] 0 and 1
[Recommended value] 0--disable
PWRADJTP (TCH Power Syn. Adjust Type) [Description] This field represents whether FCH power sync algorithm to use relative or
absolute value for power adjustment. The relative value here is that of At/Ap.
[Type] Algorithm parameter
[Range and unit] 0-------relative value
1------absolute value
[Operating range] 0 and 1
[Recommended value] 0relative value, which should not be modified
STARTVALVE (TCH Power Sync Start Valve) [Description] If FCH power sync algorithm switch is open, power sync occurs during soft
handoff when power difference between the branches is more than this valve.
[Type]
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Algorithm parameter
[Range and unit] 0--255, with the unit of 0.25dB
[Operating range] [Recommended value] 8, which should not be modified
[Setting tradeoff] The larger parameter value, the larger start valve, and the larger power
difference between allowed branches is. Vice versa.
STOPVALVE (TCH Power Sync Stop Valve) [Description] If FCH power sync algorithm switch is open, perform once power sync
adjustment during soft handoff because power difference between branches is
more than TCH power sync start valve. Continue to perform power sync adjustment if the power difference between branches is still more than this
valve. If the power difference is less than this valve after the adjustment, stop
the power sync adjustment.
[Type] Algorithm parameter
[Range and unit] 0--255, with the unit of 0.25dB
[Operating range] 4--16 (stop valve is smaller than start valve)
[Recommended value] 4, which should not be recommended
[Setting tradeoff] The larger parameter value, the easier power sync stops and the larger power
difference between allowed branches. Vice versa.
CALCUMETHOD (TCH Power Sync Calculation Method) [Description] This field represents the calculation method of At/Ap in the FCH power sync.
[Type]
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Algorithm parameter
[Range and unit] 0---METHOD0 (extreme value average method), 1----METHOD1 (the
strongest branch method), 2----METHOD2 (hybrid method) and
3----METHOD3 (weighted-average method)
[Operating range] 0, 1, 2 and 3
[Recommended value] 0---adopt extreme value average method, which should not be modified.
DELAYFRAMES (TCH Power Sync Delay Frames) [Description] After once power sync adjustment is delivered, the reverse frame received
within a time period cannot reflect power change after the adjustment and
cannot be a trigger source to trigger a new adjustment. Perform a new
adjustment after waiting for a delay. This parameter represents this delay.
[Type] Algorithm parameter
[Range and unit] 3--255, with the unit of frame
[Operating range] 3--255
[Recommended value] 3, which should not be modified
[Setting tradeoff] This parameter affects power sync frequency. The larger the parameter value,
the lower the frequency. Vice versa.
SCHPWRSYNSW (SCH Power Synch Switch) [Description] Whether to enable SCH power Sync function.
[Type] Algorithm parameter
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[Range and unit] 0Off 1---On
[Operating range] 0 and 1
[Recommended value] 0
SCHPWRADJTP (SCH Power Sync Adjustment Type) [Description] This parameter represents that SCH power sync algorithm adopts relative or
absolute value for power adjustment. Here, relative value is that of At/Ap.
[Type] Algorithm parameter
[Range and unit] 0relative value 1---absolute value
[Operating range] 0---relative value
[Recommended value] 0, which should not be modified
SCHCALCMETHOD (SCH Power Sync Calculation Method) [Description] This field represents At/Ap calculation method in the SCH power sync.
[Type] Algorithm parameter
[Range and unit] 3---METHOD3 (weighted-average method). Refer to [Range and Unit] of TCHCALCMETHOD (TCH Power Sync Calculation Method).
[Operating range] 3
[Recommended value] 3---adopt weighted-average method, which should not be modified.
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SCHSYNPERIOD (SCH Power Sync Period) [Description] Once SCH power synch algorithm is activated, start periodical power sync.
This parameter represents the period for SCH power sync. But FCH power
sync algorithm is activated based on start valve and stop valve.
[Type] Algorithm parameter
[Range and unit] 0--255, with the unit of frame
[Operating range] 3--10
[Recommended value] 5, which should not be recommended
[Setting tradeoff] The larger parameter value, the larger SCH power sync frequency..
If the frequency is large, power adjustment effect may not be feed back in
time to affect sync performance.
REVSCHPWRCTRLSW (Reverse SCH Power Control Switch) [Description] Whether to enable reverse SCH power control function.
[Type] Algorithm parameter
[Range and unit] 0---Off 1--On
[Operating value] 0 and 1
[Recommended value] 0--Off
3.3 Reverse Closed Loop Power Control Parameters (RCLPC) [Command name]
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MOD RCLPC (Base Station Controller Management\Configuration
Management\Algorithm Management\Modify Reverse Closed Loop Power
Control Parameters)
REVPWRCSTEP (Reverse Power Control Step)
[Description]
This parameter represents the power control step in the reverse closed loop
power control mode. When the MS receives an UP power control bit on the
forward power control sub-channel, the transmit power of the MS will increase
by one power control step on the basis of the open loop estimation and the
previous closed loop adjustment value. If the MS does not support reverse
supplementary channel or reverse supplementary code channel, the MS must
support power control step with 1 dB. Otherwise, the MS must support power
control step with 0.5 dB and 1 dB. If MS supports power control step with
0.25dB, MS should support power control step with 0.5dB and 1 dB.
[Type]
Um interface parameter, used by the MS (PCNM, UHDM and GHDM).
[Range and unit]
0 ~ 2, where 0 represents a step of 1dB, 1 represents a step of 0.5dB and 2 a
step of 0.25dB respectively.
[Operating range]
0~2
[Recommended value] 1
[Setting tradeoffs]
If the step is small, the power will change steadily. Otherwise, the power
will change dramatically. Because the reverse power can be adjusted 800
times per second, the controlled speed can meet the requirement. The smaller
the power control step is, the more precise the power control is. In this way,
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less power will be wasted. Therefore, a step of 0.25dB is optimal to save the
system power.
When the MS does not support some power control steps, but if the value
of this parameter is small, the MS will automatically select a step that it
supports. For example, if the minimum power control step that the MS supports
is 0.5dB, but the reverse power control step is set to 0.25dB in the system, the
MS will automatically set the power control step to 0.5dB.
VFCHRLGAINADJ (Voice Service R-FCH Power Adjust Gain Relative to ACH) DFCHRLGAINADJ (Data Service R-FCH Power Adjust Gain Relative to ACH)
[Description]
This parameter represents the power adjustment of the reverse traffic channel
relative to access channel, enhanced access channel and reverse universal
control channel. In the following formula, after the MS accesses the system, the
initial power of the traffic channel is the power of the current access channel
plus the value of this parameter.
mean output power (dBm) =
- mean input power (dBm)
+ offset power (from Table 2.1.2.3.1-1)
+ interference correction
+ ACC_CORRECTIONS
+ RLGAIN_ADJs
They are set based on voice and data service separately.
[Type]
Um interface parameter, used by the MS (ECAM)
[Range and unit]
-8 dB~7dBoffset.
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[Operating range]
0~6
[Recommended value]
0
[Setting tradeoffs]
A high value can improve the transmission quality at the early stage of calls as
well as the call setup success ratio, but will affect the system capacity and
increase the power consumption of the MS.
RLGAINSCHPLT1X (1X R-SCH Gain Offset Relative to R-PICH) RLGAINSCHPLT2X (2X R-SCH Gain Offset Relative to R-PICH) RLGAINSCHPLT4X (R 4X R-SCH Gain Offset Relative to R-PICH) RLGAINSCHPLT8X (R 8X R-SCH Gain Offset Relative to R-PICH) RLGAINSCHPLT16X (16X R-SCH Gain Offset Relative to R-PICH) RLGAINSCH_PLT32X (32X R-SCH Gain Offset Relative to R-PICH)
[Description]
The group of above parameters represent the power offsets of the SCH relative
to the pilot channel and the power offset is delivered to the MS in the extended
supplement channel assignment message (ESCAM).
Note: The value of this parameter is a part of the power offset of reverse SCH
and reverse pilot, as shown in the following formula:
mean code channel output power (dBm) =
mean pilot channel output power (dBm)
+ 0.125 *( Nominal_Attribute_Gain[Rate, Frame
Duration, Coding]
+ Attribute_Adjustment_Gain[Rate, Frame Duration,
Coding]
+ Reverse_Channel_Adjustment_Gain[Channel]
- Multiple_Channel_Adjustment_Gain[Channel]
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- Variable_Supplemental_Adjustment_Gain[Channel]
+ RLGAIN_TRAFFIC_PILOTs
+ RLGAIN_SCH_PILOT[Channel]s)
+ IFHHO_SRCH_CORR.
[Type]
Um interface parameter, used by the MS (ESCAM)
[Range and unit]
-32 ~31, (unit: 0.125dB).
[Operating range]
0~22
[Recommended value]
Shown in the following table
If recommended value is set to 8, it is 1dB.
Rate Recommended value
1X 8
2x 12
4x 16
8x 18
16x 20
32x 22
[Setting tradeoffs]
A high value of this parameter can improve the transmission efficiency of the
reverse SCH, but will affect the reverse capacity. The higher the rate of SCH
is, the higher the required power is. Therefore, the offset of this parameter
should also be larger.
FCHMPLTGAINRC3 (Gain of RC3 R-PICH Relative to Main Channel for FCH)
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FCHMPLTGAINRC4 (Gain of RC4 R-PICH Relative to Main Channel for FCH) [Description] This group of parameters is used reverse inloop power control of IS2000. BTS
converts representation of traffic channel EbNt of target SetPoint sent from
the BSC into that of Eclo and compares with actual reverse pilot Eclo to
determine reverse power control bit. This parameter is sent through Abis
interface and A3 interface and delivered to BTS by BSC.
[Type] Abis and A3 interface protocol parameters, used by BTS.
[Range and unit] -2550, with the unit of 0.125dB
[Operating range] -2550
[Recommended value] 0
[Setting tradeoff] None
VFCHREVINIT (Voice Service Reverse Initial Set Value for FCH) DFCHREVINIT (Data Service Reverse Initial Set Value for FCH)
[Description]
For different RCs, the system automatically converts the value of this
parameter to the corresponding Ec/Io and then sets it in BTS (Refer to section
3.1.1 Set Value of reverse OutLoop FCH).The value of this parameter is
reasonable if it does not cause too high an overshoot.
They are set based on voice and data service separately.
[Type]
Algorithm parameter
[Range and unit]
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0~255 (unit: 0.125dB)
[Operating range]
(REV_MIN_FCH_SET_PT + 3dB) ~ REV_MAX_FCH_SET_PT -1dB)
[Recommended value]
48, which means the initial Eb/Nt =6dB for all RCs.
[Setting tradeoffs]
If the value of this parameter is large, the reverse power control will start at
a high power level, so power will be wasted at the beginning. If the value is small,
it is necessary to increase the Eb/Nt through the reverse power control. In this
way, the FER at the very beginning of calling may be higher than the expected
FER. This value will affect the time in which the Eb/Nt can be adjusted to a
proper value through the reverse power control. If the value of this parameter is
properly set, the Eb/Nt can be adjusted to the required value quickly. Thus, the
network performance can ensure that the FER will not be higher than the
specified FER, and meanwhile, little power resource is wasted.
If this value is too small, network FER cannot satisfy requirements (such as
1%). If this value is too large, power waste occurs at the very begging.
VMAXFCH (Voice Service Max. Value of FCH Outer Loop) DMAXFCH (Data Service Max. Value of FCH Outer Loop)
[Description]
This parameter represents the maximum set value of out loop FCH Eb/Nt. They
are set based on voice and data service separately.
[Type]
Algorithm parameter
[Range and unit]
0~255 (unit: 0.125dB)
[Operating range]
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48~96
[Recommended value]
96, which means the maximum set value of out loop FCH Eb/Nt =12dB for all
RCs
[Setting tradeoffs]
If the value of the parameter is large in the severe radio environment, the call
quality can be ensured but the reverse capacity of the system will decrease.
If the value is small, a call drop may occur under the fading environment, such
as at a corner. Under the interference environment, a properly high value of this
parameter can ensure the call quality and reduce the call drop ratio. But the
function is subject to the limitation of the maximum transmit power of the MS.
VMINFCH (Voice Service Mini. Value of FCH Outer Loop) DMINFCH (Data Service Mini. Value of FCH Outer Loop)
[Description]
This parameter is a reverse FCH closed loop power control parameter. The
parameter represents the minimum set value of reverse FCH Eb/Nt. They are
set based on voice and data service separately.
[Type]
Algorithm parameter
[Range and unit]
0~255 (unit: 0.125dB)
[Operating range]
8~32
[Recommended value]
Mini. Voice service FCH outloop set value is set to 16 for all RCs and the
minimum set value of outloop EbNt= 2dB.
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Mini. Data service FCH outloop set value is set to 32.
[Setting tradeoffs]
If the value of this parameter is set too large, the Eb/Nt will be higher than the
required value, so the reverse power will be wasted and the reverse capacity
will greatly be affected.
If the value is set small, there is much room for the adjustment of reverse out
loop algorithm. So the call quality can be ensured and the reverse capacity can
be improved, given a high power control performance.
But if the value is set too small, it is possible that the out loop set value
decreases so much that it can not rise in time under the fading environment, so
the call quality may be affected.
MAXDCCH (Max. Value of DCCH) [Description] Refer to [Description] of max. FCH outloop set value.
MINDCCH (Mini. Value of DCCH) [Description] Refer to [Description] in mini. FCH outloop set value.
MAXSCH (Max. Value of SCH) [Description] This parameter represents maximum Eb/Nt set value of the reverse SCH
closed loop power control (outloop corresponding to FCH).
[Type] Algorithm parameter
[Range and unit] 0~255, with the unit of 0.125dB
[Operating range] 48~96
[Recommended value]
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96, which represents maximum outloop set value EbNt =12dB for all rates.
[Setting value] If this parameter is set to a higher value, data transmission quality can be
ensured even under server radio environment but system reverse capacity
decreases.
If this parameter is set a small value, many error frames occur, affecting data
service transmission. Under the interference environment, a properly high
value of this parameter can ensure the data transmission quality and reduce
the call drop ratio. But the function is subject to the limitation of the maximum
transmit power of the MS.
MINSCH (Mini. Value of SCH) [Description] This parameter represents the minimum Eb/Nt set value of reverse SCH
closed loop power control (outloop corresponding to FCH).
[Type] Algorithm parameter
[Range and unit] 0~255, with the unit of 0.125dB
[Operating range] 8~32
[Recommended value] 32, which represents minimum outloop set value EbNt= 4dB for all RCs.
[Setting tradeoff] If this parameter is set a high value, reverse SNR EbNt is higher than
required value to waste reverse power and reverse capacity is affected
greatly.
If this parameter is set to a small value, there is much room for the
adjustment of reverse SCH out loop algorithm. So the data service
transmission quality can be ensured and the reverse capacity can be
improved, given a high power control performance.
FCHPWRCFRQ (Reverse Outer Loop Power Control Period for FCH)
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DCCHPWRCFRQ (Reverse Outer Loop Power Control Period for DCCH)
[Description]
The value of this parameter determines the reverse out loop control period. If
PWR_CTRL_FREQ_FCH (reverse FCH out loop power control period)
consecutive good frames are received, the Eb/Nt will decrease by
EB_NT_DOWN_STEP_FCH (Eb/Nt down step).This parameter is one of
reverse power control parameters. The algorithm convergence should be
considered when this parameter is modified.
[Type]
Algorithm parameter
[Range and unit]
0~255 (unit: frame).
[Operating range]
This value should correspond to the target FER of FCH.
[Recommended value]
33
[Setting tradeoffs]
If the value of this parameter is set large, the control period will be long and
the power will change steadily. If the value is set small, the control period will
be short and the power will change dramatically
FCHNTDWNSTEP (Eb/Nt Down Step for FCH)
[Description]
This parameter represents the Eb/Nt down step after PWR_CTRL_FREQ_FCH
(power control period of reverse outloop (FCH)) consecutive good frames
appear.
[Type]
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Algorithm parameter
[Range and unit]
0~255 (unit: 0.125dB)
[Operating range]
0~255
[Recommended value]
1, namely, 0.125dB
[Setting tradeoffs]
If the value is set small, the power will change steadily and the overshoot will
be low. If the value is set large, the power will change dramatically and the
overshoot will be high. To obtain a power control precision as high as possible,
the value is usually set to 1
FCHENMAXSTEP (Eb/Nt Max. Adjustment Step for FCH)
[Description]
This parameter represents the allowable maximum adjustment step each time
the power is adjusted. Refer to PWR_CTRL_FREQ_FCH (power control
period of reverse outloop (FCH))
[Type]
Algorithm parameter
[Range and unit]
0~255 (unit: 0.125dB)
[Operating range]
5~10
[Recommended value]
10, namely, 1.25dB
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[Setting tradeoffs]
This parameter is used to restrict the adjustment step of the out loop power
control so that the adjustment step could not be too large. If the adjustment
step is set too small, the desired adjustment will be so restricted that the
normal power control performance could fail. Therefore, the adjustment step
can not be set too small
LNKRPTFRQ (Power Control Report Granularity)
[Description]
This parameter represents the time granularity when the reverse link report of
FMR is reported to SPU.
[Type]
Algorithm parameter
[Range and unit]
10~255 (unit: 100ms)
[Operating range]
10~255
[Recommended value]
20, which should not be modified
[Setting tradeoffs]
None
OLOOPPERIODSCH (Power Control Period of Reverse Outer Loop for SCH) [Description] This value determines adjustment period of reverse SCH outloop (or closed
loop, because reverse SCH closed loop has no obvious outloop). After
OUTER_LOOP_PERIOD_SCH (Power Control Period of Reverse Outer
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Loop for SCH) good frames are received, decrease OLOOPDSTEP (Eb/Nt down step for SCH). Consider algorithm convergence when a group of parameters in reverse SCH closed loop power control, which is similar to FCH
outer loop. [Type] Algorithm parameter
[Range and unit] 0~255, with the unit of frame
[Operating range] 0~255
[Recommended value]
19
[Setting tradeoff] If the value of this parameter is set large, the adjustment period will be long
and the power will change steadily. If the value is set small, the adjustment
period will be short and the power will change dramatically.
OLOOPDSTEPSCH (Eb/Nt Down Step for SCH) [Description] This parameter represents set down step after
OUTER_LOOP_PERIOD_SCH good frames are received. [Type] Algorithm parameter
[Range and unit] 0~255, with the unit of 0.125dB
[Operating range] 0~255
[Recommended value] 1, namely, 0.125dB
[Setting tradeoff] If this parameter is set to a small value, the power control is stable, with little
adjustment. If this parameter is set to a large value, power control changes
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dramatically, with obvious adjustment. To obtain accurate power control
value, this parameter is set to 1 in general.
OLOOPMAXUSTEPSCH (Eb/Nt Max. Adjustment Step for SCH) [Description] This parameter represents allowable max. step after reverse SCH closed loop
power control algorithm obtains set up step.
[Type] Algorithm parameter
[Range and unit] 0~255, with the unit of 0.125dB
[Operating range] 5~10
[Recommended value] 10, namely, 1.25dB
[Setting tradeoff] This parameter is to restrict once outloop adjustment value within an allowable
range. If this value is set too small, the normal adjustment is restricted to
affect normal power control performance. Therefore, this value should not set
too small. RCAGFAC (SCH Inner Loop Power Control Adjust Factor) [Description] This parameter represents a ratio factor of actual RCAG adjustment to
calculated RCAG adjustment. Currently, this parameter is set to 1, indicating
that perform the adjustment directly through calculated RCAG adjustment.
[Type] Algorithm parameter
[Range and unit] 0~255
[Operating range] 0~1
[Recommended value]
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1, which should not be modified
ILOOPTHRESCH (SCH Inner Loop Power Control Threshold) [Description] This parameter represents a threshold whether to perform RCAG adjustment.
RCAG adjustment aims to enable SCH Eb/Nt estimated by the BSC close to
required value. If there is an obvious difference between this estimation value
and set value, trigger RCAG adjustment.
[Type] Algorithm parameter
[Range and unit] 0~255, with the unit of 0.125dB
[Operating range] 0~8
[Recommended value] 4, namely, 0.5dB, which should not be modified
ILOOPINTSCH (SCH Inner Loop Power Control Interval) [Description] This parameter represents minimum interval sending two adjacent PCNMs,
because RCAG adjustment is sent to MS through power control message,
that is, minimum interval of two adjacent RCAG adjustments.
[Type] Algorithm parameter
[Range and unit] 0~255, with the unit of frame
[Operating range] 0~255
[Recommended value] 20, which should not be modified
[Setting tradeoff]
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If this value is set small, signaling overload on the FCH may occur. If this
value is set large, power control rate is slow.
SETEBNTVALTIMESCH (SCH Outer Loop Eb/Nt Set Valid Duration) [Description] This parameter represents whether the SCH requested by two adjacent Data
Burst inherits interval of Eb/Nt set value. Because MS applies for reverse SCH
and if the interval between Duration start time of latter SCH and end time of
former SCH is less than this parameter, the Eb/Nt set value of latter SCH
inherits the final set value of former Eb/Nt.
[Type] Algorithm parameter
[Range and unit] 0~255, with the unit of frame
[Operating range] 0~255
[Recommended value] 20, which should not be modified
MAXRCAG (Max. RCAG Value) [Description] This parameter represents maximum RCAG value.
According to the protocol, the code channel transmit power is shown below
when MS sends traffic channels of RC3, 4, 5 and 6:
mean code channel output power (dBm) =
mean pilot channel output power (dBm)
+ 0.125 (Nominal_Attribute_Gain[Rate, Frame Duration,
Coding]
+ Attribute_Adjustment_Gain[Rate, Frame Duration, Coding]
+ Reverse_Channel_Adjustment_Gain[Channel]
- Multiple_Channel_Adjustment_Gain[Channel]
- Variable_Supplemental_Adjustment_Gain[Channel]
+ RLGAIN_TRAFFIC_PILOTs
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+ RLGAIN_SCH_PILOT [Channel] s)
+ IFHHO_SRCH_CORR
Where, mean pilot channel output power represents output power
of reverse pilot channel and transmit power when reverse closed
loop power control adjusts R-PICH. On the basis of reverse pilot
power, the overlay of FCH transmit power and SCH transmit
power has offsets, which are set by many parameters. They are
detailed as follows:
z RLGAIN_TRAFFIC_PILOTs: Efficient for reverse FCH, reverse SCH and DCCH. They are delivered to MS through
ESPM.
z RLGAIN_SCH_PILOT: Efficient for R-SCH only. It is delivered through ESCAM.
z Nominal_Attribute_Gain: MS should keep a Nominal_Attribute_Gain table, reflecting power offset of RSCH,
RFCH, or RDCCH to reverse pilot channel. They are specified
in a table by the protocol.
z Attribute_Adjustment_Gain: MS should keep an Attribute_Adjustment_Gain table, including data rates, frame
length, code rate and power gain relative to reverse pilot
channel. MS initializes this table to 0.
z Reverse_Channel_Adjustment_Gain: Similar to Attribute_Adjustment_Gain. This parameter is abbreviated as
RCAG.
z Multiple_Channel_Adjustment_Gain: If reverse pilot channel is eliminated and MS is sending two or more code channels, MS
should set this parameter based on the method specified by
the protocol. Otherwise, MS sets this parameter to 0. This
adjustment decreases transmit power of R-FCH to increase
FER of R-FCH after MS starts to send R-SCH. This parameter
is abbreviated as MCAG.
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If MS is sending two or more code channels except reverse pilot
channel, MS sets Multiple_Channel_ Adjustment_Gain [Channel]
for each channel based on the following modes:
a) Label Max_Channel as the code channel with highest
Pilot_Reference_Level when MS is sending all the code
channels. Check the Pilot_Reference_Level through protocol
table.
b) Set Multiple_Channel_Adjustment_Gain[Max_Channel] to 0.
c) The settings for other channels are shown below:
Multiple_Channel_Adjustment_Gain[Channel]=Pilot_Reference
_Level[Max_Channel] - Pilot_Reference_Level[Channel]
Variable_Supplemental_Adjustment_Gain: If MS supports reverse
SCH of variable rate and is using the rate on R-SCH, MS sets this
parameter based on the method provided by protocol. Otherwise,
set this parameter to 0.
IFHHO_SRCH_CORR represents a correction of different
frequency hard handoff.
For the above variables, modify dynamically power offset of
R_SCH relative to R-PICH. Implement reverse SCH power control
through Nominal_Attribute_Gain and
Reverse_Channel_Adjustment_ Gain.
Because the operating range to adjust relevant parameters of
the former in the PCM is inconsistent with initial value range of MS,
the latter instead of the former is used for an adjustment of SCH
power control. That is, RCAG.
[Type] Algorithm parameter
[Range and unit] -48~48, with the unit of 0.125dB
[Operating range] -48~48
[Recommended value] 48, which should not be modified
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MINRCAG (Mini. RCAG Value) [Description] This parameter represents the minimum RCAG value. Refer to [Description] in the maximum RCAG value.
[Type] Algorithm parameter
[Range and unit] -48~48, with the unit of 0.125dB
[Operating range] -48~48
[Recommended value] -8, which should not be modified
MAXRCAGADJSTEP (Max. RCAG Adjust Step) [Description] This parameter represents maximum adjustment step in case of RCAG
adjustment.
[Type] Algorithm parameter
[Range and unit] 0~96, with the unit of 0.125dB
[Operating range] 0~96
[Recommended value] 8, which should not be modified
3.4 Forward Slow Power Control Parameters (FSLOWPC) [Command name] MOD FSLOWPC (Base Station Controller Management\Configuration
Management\Algorithm Management\ Modify Forward Slow Power Control
Parameter)
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FWDMAXCHGAIN (Max. Transmit Power of FCH)
[Description]
This parameter represents the maximum transmit power of forward channel in
the measurement report power control mode. The capacity and quality can well
be balanced by modifying the value of this parameter. Therefore, this
parameter will be determined according to the actual requirement.
[Type]
Algorithm parameter
[Range and unit]
-255~0, with the unit of 0.28dB. For the representation, refer to 3.1.3.
[Operating range]
(pilot channel gain -6dB) ~ pilot channel gain
[Recommended value]
Pilot channel gain -3dB (PLTCHNPWRGAIN - 12). For example, if the pilot
channel gain is -28, the recommended value is -40.
[Setting tradeoffs]
This parameter is used to restrict the maximum transmit power of forward
channel to avoid a single traffic channel from occupying excessive forward
power resources as a result of the power control. Under severe environments,
if the value of this parameter is set too large, the call quality can still keep at a
certain level, but the forward capacity will decrease. If the value is set too
small, the call quality will be greatly degraded, or even call drops may occur,
but the forward capacity will relatively increase.
FWDMINCHGAIN (Min. Transmit Power of FCH)
[Description]
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This parameter represents the minimum transmit power of forward channel in
the measurement report power control mode.
[Type]
Algorithm parameter
[Range and unit]
-255~0, with the unit of 0.25dB. For the representation, refer to 3.1.3.
[Operating range]
(Pilot channel gain -13dB) ~ (pilot channel gain - 9dB)
[Recommended value]
Pilot channel gain -9dB (PLTCHPWRGAIN -36). For example, if the pilot
channel gain is -28, the recommended value is -64. In the practical networks,
this value can be set lower properly to increase the system capacity and keep
the call drop ratio within the required range.
[Setting tradeoffs]
Under good radio environments, if the value of this parameter is set large, the
improvement of call quality will not be very significant, but the forward capacity
will decrease. If the value is set small, the change of call quality will not be
significant, either, but the forward capacity will increase. Ensure that the power
can increase quickly when the radio environment becomes deteriorated
FWDINITCHNGAIN (FCH Initial Transmit Power)
[Description]
This parameter represents the initial transmit power of forward channel in the
measurement report power control mode. In the capacity test, to ensure the
capacity, set appropriately initial transmit power of forward channel to a small
value. For example, if radio environment of capacity test is good, decrease this
parameter to -68 (pilot channel gain is -28), but a call must be connected.
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[Type]
Algorithm parameter
[Range and unit]
-255~0, with the unit of 0.25dB. For the representation, refer to 3.1.3 [Operating range]
(FWDMAXCHGAIN - 3dB) ~ FWDMAXCHGAIN.
FWDMAXCHGAIN is determined by pilot gain. For the operating range, see
that in FWDMAXCHGAIN (max. transmit power of forward channel).
[Recommended value]
Pilot channel gain-7dB (PLTCHPWRGAIN -28). If pilot gain is -28, this value is
-56.
[Setting tradeoffs]
The initial power should be slightly lower than the maximum transmit power so
as to ensure the call quality when the call is established. If forward radio
environment is good, FER is low and forward power decreases quickly.
THRSPWRDWN (Power Decrease Step)
[Description]
This parameter represents the step by which the power decreases when the
timer waiting for power control measurement report from MS. The smaller the
down step, the little possibility call drops caused by decrease power during the
power control.
[Type]
Algorithm parameter
[Range and unit]
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0~255 (unit: 0.25dB)
[Operating range]
0~255
[Recommended value]
2, namely, 0.5 dB
[Setting tradeoffs]
If the value of this parameter is set too large, the power will decrease greatly,
but the quick decrease may result in power waste. When the value is set too
small, the power will decrease a little, the slow decrease may result in power
waste instead of call drops.
PWRRPTTHRS (Power Control Reporting Threshold)
[Description]
This parameter represents the cooperation between measurement report
parameters. Refer to bad frame counter. If the received bad frames in the
period stipulated by the parameter PWRRPTFRMNUM exceed the threshold,
the MS will report the power measurement report message.
[Type]
Um interface parameter, used by the MS (SPM)
[Range and unit]
0~31 (unit: frame).
[Operating range]
0~31
[Recommended value]
2
[Setting tradeoffs]
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If the value of this parameter is set too large, the radio signal fading can not
be compensated to quickly in the threshold-based measurement report
power control mode, so a power control delay will occur. If the value is set
too small, the power measurement report message will frequently be
reported. In this case, too many signaling messages will affect the call
quality. If the value is set to 1, the MS will report a power measurement
report message (PMRM) each time it receives a bad frame. If target FER is
1%, it is normal to receive one error frame within 100 frames. But if power
report threshold is set to 1, error frame is taken as power increase by
mistake. So good power control performance cannot be obtained.
PWRRPTFRMNUM (Power Control Reporting Frame Count)
[Description]
This parameter determines the power report measurement period Z = 5 2^
(PWRRPTFRMNUM /2) frames. In the period-based measurement report
power control mode, a PMRM will be reported each time the MS receives Z
frames. In the threshold-based measurement report power control mode, the
bad frames will also be measured each time the MS receives Z frames. If the
total bad frames out of Z frames do not reach the power report threshold", bad
frames will be counted from "0 again in the next measurement period. If the
bad frames out of Z frames reach the power report period threshold before a
measurement period ends, a PMRM will be reported. In the meantime, a new
measurement period will start and the period length is still Z frames.
[Type]
Um interface parameter, used by the MS (SPM)
[Range and unit]
0~15, with the unit of frame, 0: FRAME5,1: FRAME7,2: FRAME10,3:
FRAME14,4: FRAME20,5: FRAME28,6: FRAME40,7: FRAME56,8:
FRAME80,9: FRAME113,10: FRAME160,11: FRAME226,12: FRAME320,13:
FRAME452,14: FRAME640, and 15: FRAME905.
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[Operating range]
0~15, drop-down list on the maintenance console is used to display the range
of value, and select the value directly.
[Recommended value]
9, namely, 113 frames
[Setting tradeoffs]
In the threshold-based measurement report power control mode, the value of
this parameter is only used as the measurement period. If the value is set
large, the number of re-measurements will be reduced. The calculated bad
frames will be more than the actual ones since the total measured frames are
smaller due to the segmentation of period.
If cycle mode is adopted, set the parameter based on target FER and
PWRRPTTHRS. For example, target FER is set to 1, and PWRRPTTHRS is
set to 2, the cycle must be about 200 frames. According to the formula, the
parameter is set to 11(226 frames). But this mode is not adopted in generally.
PWRTHREENABLE (Power Threshold Report Flag)
[Description]
This parameter is a measurement report power control parameter, indicating
whether the threshold-based measurement report power control mode is used.
Since the response is quick in the threshold-based measurement report power
control mode, this kind of power control mode is usually used.
[Type]
Um interface parameter, used by the MS (SPM)
[Range and unit]
0 or 1. 0 Not used; 1 Used.
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[Operating range]
0 or 1
[Recommended value]
1
[Setting tradeoffs]
None
PWRPERIODENABLE (Period Report Mode Flag)
[Description]
Measurement report power control will have a high performance if the
threshold-based measurement report power control is used.
[Type]
Um interface parameter, used by the MS (SPM)
[Range and unit]
0 or 1, 0 Not used; 1 Used
[Operating range]
0 or 1
[Recommended value]
0, period-based measurement report power control is not used.
[Setting tradeoffs]
None
PWRPTDL (Power Report Delay)
[Description]
After reporting a PMRM, the MS will wait for a while to start the measurement
in the next measurement period. The value of this parameter determines how
many frames the MS waits for to start the next measurement period. The
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purpose of setting the time of the delayed measurement is to restart the
measurement of forward frames after the forward power control triggered by
the previous PMRM takes effect.
[Type]
Um interface, used by MS (SPM).
[Range and unit]
0~31 (unit: 4 frames)
[Operating range]
1~2
[Recommended value]
1
[Setting tradeoffs]
If the delay is set large, the probability of bad frames not being measured will
increase, so it is set to the minimum 1, namely, 4 frames.
WAITMSPCRPTTIMER (Wait MS Power Control Measurement Report Timer Length)
[Description]
In the threshold-based measurement report power control mode, if the power
measurement report message reported by the MS fails to be received within
the timer length, the forward transmit power of the current forward traffic
channel will be reduced. The timer length parameter is configured in TIMER.
[Type]
Algorithm parameter, used by power control module in SPU
[Range and unit]
0~255 (unit: 1 second)
[Operating range]
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0~255
[Recommended value]
2, namely, 2 seconds
[Setting tradeoffs]
The smaller the timer length is, the quicker the power control is. In the
meantime, the mean square deviation will increase, too. But if the timer length
is set too large, the power control will become so slow that the radio signal
change might fail to be traced. As a result, call drops and power waste may be
caused.
FSCHFERRPT (FSCH FER Report Indication)
[Description]
This parameter indicates whether the MS reports the frame quality information
of the FSCH. If this parameter is set to 1, the MS will record the total frames
and bad frames of FSCH. After a burst completes, the MS will report the frame
information of SCH via PMRM and also reset the counter. If the parameter is
set to 0, the MS will not report any information of SCH.
[Type]
Um interface parameter, used by the MS (ESCAM)
[Range and unit]
0 or 1. 0 Not report; 1 Report
[Operating range]
0 or 1
[Recommended value]
0
[Setting tradeoffs]
None
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3.5 Forward EIB Power Control Parameters (FEIBPC) [Command name] MOD FEIBPC (Base Station Controller Management\Configuration
Management\Algorithm Management\Modify Forward EIB Power Control
Parameter)
FWDCHMAXGAIN (F-TCH Max. Tx. Power)
[Description]
This parameter represents the maximum transmit power of the forward channel
in the EIB power control. The capacity and quality can well be balanced by
modifying the value of this parameter. Therefore, this parameter will be
determined according to the actual requirement.
[Type]
Algorithm parameter, used by power control modules of FMR
[Range and unit]
-255~0, with the unit of 0.25dB. For details, see section 3.1.3
[Operating range]
(Pilot channel gain -3dB) ~ Pilot channel gain
[Recommended value]
Pilot channel gain -3dB (PLTCHPWRGAIN 12). For example, if the pilot
channel gain is -28, the value of this parameter is -40. The pilot gain is
recommend as -1dB.
[Setting tradeoffs]
This parameter is used to restrict the maximum transmit power of forward
channel to avoid a single traffic channel from occupying excessive forward
power resources as a result of the power control. Under severe environments,
if the value of this parameter is set too large, the call quality can still keep at a
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certain level, but the forward capacity will decrease. If the value is set too
small, the call quality will be greatly degraded or even call drops may occur,
but the forward capacity will relatively increase.
FWDCHMINGAIN (F-TCH Min Tx. Power)
[Description]
This parameter represents the minimum transmit power of the forward channel
in the EIB power control.
[Type]
Algorithm parameter, used by power control modules of FMR
[Range and unit]
-255~0, with the unit of 0.25dB. For details, see section 3.1.3
[Operating range]
(Pilot channel gain-15dB) ~ (pilot channel gain -- -9dB)
[Recommended value]
Pilot channel gain -9dB (PLTCHPWRGAIN - 36). If the pilot channel gain is -28,
the recommended value is -64. Pilot gain is recommend to -15dB that is -88.
[Setting tradeoffs]
Under good radio environments, if the value of this parameter is set large, the
improvement of call quality will not be very significant while the forward
capacity will decrease. If the value is set small, the change of call quality will
not be significant while the forward capacity will increase. Ensure that the
power can increase quickly when the radio environment becomes
deteriorated.
EIBTCNT (Timer Length After Bad Frame Received)
[Description]
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This parameter represents the counter length since a bad frame is received. If
another bad frame is received within the counter length, the forward power of
the BTS will remain unchanged. If a good frame is received within the counter
length, the forward power will decrease by a big step EIBDWNSTEP.
[Type]
Algorithm parameter, used by power control modules of FMR
[Range and unit]
0~255 (unit: frame)
[Operating range]
0~255
[Recommended value]
3, which should not be modified
[Setting tradeoffs]
Consider algorithm convergence when EIB algorithm parameter is modified.
The convergence: Under certain target FER, supposing actual FER of radio
link is up to target FER, down power and up power in a control period are off
tradeoff. If target FER is 1%, that is, 1 bad frame, 99 good frames, power
keeps balance after once power up and 99 times of power down.
EIBUPSTP (Power Up After Bad Frame Received)
[Description]
This parameter represents the power increase step when one bad frame is
received after many successive good frames.
[Type]
Algorithm parameter, used by power control modules of FMR
[Range and unit]
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0~255 (unit: 0.25dB)
[Operating range]
0~255
[Recommended value]
8, namely 2dB
[Setting tradeoffs]
If the EIB algorithm parameter needs to be modified, the algorithm
convergence should be taken into consideration. When the value of this
parameter is set large, the fading can be compensated quickly, but some
power will be wasted. When the value is set small, the transmit power can be
saved, but the call quality will be degraded.
EIBDWNSTPS (Power Down After Timer Reset to 0)
[Description]
This parameter represents the power decrease step when a good frame is
received. If continuous good frames are received, the number satisfies down
period and power down value calculated by FER and up step.
[Type]
Algorithm parameter, used by power control modules of FMR
[Range and unit]
0~255 (unit: 0.25dB)
[Operating range]
0~255
[Recommended value]
1, namely, 0.25dB, which should not be modified
[Setting tradeoffs]
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If the EIB algorithm parameter needs to be modified, the algorithm
convergence should be taken into consideration. The value of this parameter
is usually set to 1.If the value is set larger than 1, the power control will be
coarse but not fine.
EIBDWNSTPB (Power Down After Good Frame Received)
[Description]
This parameter represents the power down step when one good frame is
received after many successive bad frames within PWR_EIB_CNT.
[Type]
Algorithm parameter, used by power control modules of FMR
[Range and unit]
0~255 (unit: 0.25dB).
[Operating range]
0~255
[Recommended value]
2, namely, 0.5dB
[Setting tradeoffs]
A part of EIB algorithm parameter. Consider algorithm convergence during the
modification and modify many parameters at the same time.
3.6 Forward Fast Power Control Parameters (FFASTPC) [Command name] MOD FFASTPC (Base Station Controller Management\Configuration
Management\Algorithm Management\Modify Forward Fast Power Control
Parameter)
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FPWRSTEP (Forward Power Control Step)
[Description]
This parameter represents the power adjustment step in the forward fast power
control when the BTS receives a power control bit. The up and down power
adjustment steps adopt this step.
[Type]
Parameter of