(CDMA网优中级培训)02-CDMA2000功率控制及优化策略
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– – – – 153.6Kbps = FDCH Gain + 12dB 76.8Kbps = FDCH gain + 9dB 38.4Kbps = FDCH Gain + 6dB 19.2Kbps = FDCH Gain + 3dB
– FPC_MODE = 1
The Forward Link Power Control for FDCH and SCH is operated independently. FDCH power control speed = 400Hz
CDMA级）
2-1
Forward & Reverse Link Power Control Algorithm
CDMA2000网络优化篇（中级）
2-2
CONTENT
Forward Link Power Control for RC1 Forward Link Power Control Algorithm – RC2 Forward Link Power Control for RC3 Reverse Link Power Control – Open Loop Reverse Link Power Control – Closed Loop Reverse Link Power Control – Outer Loop Forward Power Control Group Reverse Power Control Group CDMA Power Performance Indicators
Pt : fixed amount of MS transmit power Pr,1 : received power from user 1 Pr,2 : received power from user 2
CDMA2000网络优化篇（中级）
2-5
The Operation of Transmit Power
0~127
2-15
Forward Link Power Control for RC3
– FPC_MODE = 0
Power Control Mode
SCH power is controlled at the same rate according to the FDCH power control. SCH power = FDCH power + Gain_Offset SCH Digital Gain for SCH Data Rate
CDMA2000网络优化篇（中级）
2-4
Why Power Control
All users share the same RF band through the use of PN codes, each user looks like random noise to other users. Each user must transmit the minimum power, which maintains service quality, to minimize interference to other users. No power control situation
– SCH power control speed = 600Hz CDMA2000网络优化篇（中级）
2-16
Forward Link Power Control Test Result
FDCH setpoint SCH Setpoint
-. If the FPC_mode is “1”, FDCH and SCH power control is operated independently.
2-11
Forward Link Power Control Algorithm – RC2
CDMA2000网络优化篇（中级）
2-12
Forward Link Power Control Algorithm - RC2
One example of FPC:BTS receive 12 EIB=1 continuously from MS
Forward Link Power Control Algorithm - RC2
Parameters Steps_til_down down_delta fdch_init_gain_RC2 fdch_max_gain_RC2 fdch_min_gain_RC2 big_up_delta small_up_delta signal_delta_gain pcsc_delta_gain1 pcsc_delta_gain2 pcsc_delta_gain3 Descriptions Waiting frames when decreasing forward link digital gain. Digital Gain value to decrease forward link digital gain. Digital Gain initial value on null traffic Maximum Digital Gain Minimum Digital Gain The value to increase digital gain larger. The value to increase digital gain smaller The value to compensate traffic channel gain The value to compensate the current traffic channel gain to get the power control sub_channel digital gain when the number of active cell is 1,2,3. CDMA2000网络优化篇（中级） Range 0~255 0~127 0~165 0~165 0~165 0~127 0~127 0~127 Value 60 1 111 126 97 5 2 96 64 96 112
Normal Voice 40 Chs
CDMA2000网络优化篇（中级）
2-7
Forward Link Power Control for RC1
CDMA2000网络优化篇（中级）
2-8
Forward Link Power Control for RC1
PWR_REP_DELAY: Frames received within a specified time (PWR_REP_DELAY * 4 frame) after PMRM is sent to the base station and are not counted in estimating the frame quality.
dB_value
– dB scale of channel power over total power – Range : -41 ~ 0 dB (0.25dB step)
dB_index
– the ratio of the maximum traffic channel energy to total transmitted power of target BS – dB_index = (dB_value + 41) 4+1 – Range : 1 ~ 165
CDMA2000网络优化篇（中级）
2-17
Forward Link Power Control for RC3
RC3 (Fast Forward Link Power Control)
Mobile Report -. -. -. -. Does Not use PMRM or EIB. Mobile setpoint is changed according to the Forward Link FER. Compared Mobile setpoint with Mobile Received Eb/No. Mobile Station transmits PCB to the Base Station.
– FPC_MODE = 2
– SCH power control speed = 400Hz
The Forward Link Power Control for FDCH and SCH is operated independently. FDCH power control speed = 200Hz
CDMA2000网络优化篇（中级）
2-9
Forward Link Power Control Algorithm – RC1
CDMA2000网络优化篇（中级）
2-10
Forward Link Power Control Algorithm – RC2
CDMA2000网络优化篇（中级）
-41dB 0 dB dB_value
0.25 dB 1234567---CDMA2000网络优化篇（中级） dB_index - - - - 165
2-6
Forward Link Channel Power Allocations
Digital Gain (2G) Pilot Sync Paging 108 34 95 OVHC total Traffic * 40 Total For Example -. Max. Tx Power: 20 watt -. Pilot power portion = 15% -. Voice Activity : 0.4 -. Traffic Channel Gain : 95 59 95 dB_index (3G) 132 92 128 Output power Watt 3 0.30 2.32 5.62 14.38 20 dBm 34.7 24.7 33.6 37.5 41.5 43 Power Ratio 15% 1% 12% 28% 72% 100% -17.5 (1 user) dB_value -8.25 -18.25 -9.25
CDMA2000网络优化篇（中级）
2-13
Forward Link Power Control Algorithm - RC2
One example of FPC:BTS receive EIB=0 continuously from MS
CDMA2000网络优化篇（中级）
2-14
CDMA2000网络优化篇（中级）
2-3
What is Power Control
Power control is to adjust the output power that can satisfy the reception of a called party and thusmaximize the system capacity in the circumstances of dynamically changing channels, velocities of mobile stations, and call status. If an area where the mobile station is moving with path loss,background noise, or severe fading, its base station should assign more power to traffic channels. Perfect power control is impossible, however, because it cannot but have some errors due to the unbalance between the forward and reverse links, incorrect estimation of the status of channels, or delay of power control.
– FPC_MODE = 1
The Forward Link Power Control for FDCH and SCH is operated independently. FDCH power control speed = 400Hz
CDMA级）
2-1
Forward & Reverse Link Power Control Algorithm
CDMA2000网络优化篇（中级）
2-2
CONTENT
Forward Link Power Control for RC1 Forward Link Power Control Algorithm – RC2 Forward Link Power Control for RC3 Reverse Link Power Control – Open Loop Reverse Link Power Control – Closed Loop Reverse Link Power Control – Outer Loop Forward Power Control Group Reverse Power Control Group CDMA Power Performance Indicators
Pt : fixed amount of MS transmit power Pr,1 : received power from user 1 Pr,2 : received power from user 2
CDMA2000网络优化篇（中级）
2-5
The Operation of Transmit Power
0~127
2-15
Forward Link Power Control for RC3
– FPC_MODE = 0
Power Control Mode
SCH power is controlled at the same rate according to the FDCH power control. SCH power = FDCH power + Gain_Offset SCH Digital Gain for SCH Data Rate
CDMA2000网络优化篇（中级）
2-4
Why Power Control
All users share the same RF band through the use of PN codes, each user looks like random noise to other users. Each user must transmit the minimum power, which maintains service quality, to minimize interference to other users. No power control situation
– SCH power control speed = 600Hz CDMA2000网络优化篇（中级）
2-16
Forward Link Power Control Test Result
FDCH setpoint SCH Setpoint
-. If the FPC_mode is “1”, FDCH and SCH power control is operated independently.
2-11
Forward Link Power Control Algorithm – RC2
CDMA2000网络优化篇（中级）
2-12
Forward Link Power Control Algorithm - RC2
One example of FPC:BTS receive 12 EIB=1 continuously from MS
Forward Link Power Control Algorithm - RC2
Parameters Steps_til_down down_delta fdch_init_gain_RC2 fdch_max_gain_RC2 fdch_min_gain_RC2 big_up_delta small_up_delta signal_delta_gain pcsc_delta_gain1 pcsc_delta_gain2 pcsc_delta_gain3 Descriptions Waiting frames when decreasing forward link digital gain. Digital Gain value to decrease forward link digital gain. Digital Gain initial value on null traffic Maximum Digital Gain Minimum Digital Gain The value to increase digital gain larger. The value to increase digital gain smaller The value to compensate traffic channel gain The value to compensate the current traffic channel gain to get the power control sub_channel digital gain when the number of active cell is 1,2,3. CDMA2000网络优化篇（中级） Range 0~255 0~127 0~165 0~165 0~165 0~127 0~127 0~127 Value 60 1 111 126 97 5 2 96 64 96 112
Normal Voice 40 Chs
CDMA2000网络优化篇（中级）
2-7
Forward Link Power Control for RC1
CDMA2000网络优化篇（中级）
2-8
Forward Link Power Control for RC1
PWR_REP_DELAY: Frames received within a specified time (PWR_REP_DELAY * 4 frame) after PMRM is sent to the base station and are not counted in estimating the frame quality.
dB_value
– dB scale of channel power over total power – Range : -41 ~ 0 dB (0.25dB step)
dB_index
– the ratio of the maximum traffic channel energy to total transmitted power of target BS – dB_index = (dB_value + 41) 4+1 – Range : 1 ~ 165
CDMA2000网络优化篇（中级）
2-17
Forward Link Power Control for RC3
RC3 (Fast Forward Link Power Control)
Mobile Report -. -. -. -. Does Not use PMRM or EIB. Mobile setpoint is changed according to the Forward Link FER. Compared Mobile setpoint with Mobile Received Eb/No. Mobile Station transmits PCB to the Base Station.
– FPC_MODE = 2
– SCH power control speed = 400Hz
The Forward Link Power Control for FDCH and SCH is operated independently. FDCH power control speed = 200Hz
CDMA2000网络优化篇（中级）
2-9
Forward Link Power Control Algorithm – RC1
CDMA2000网络优化篇（中级）
2-10
Forward Link Power Control Algorithm – RC2
CDMA2000网络优化篇（中级）
-41dB 0 dB dB_value
0.25 dB 1234567---CDMA2000网络优化篇（中级） dB_index - - - - 165
2-6
Forward Link Channel Power Allocations
Digital Gain (2G) Pilot Sync Paging 108 34 95 OVHC total Traffic * 40 Total For Example -. Max. Tx Power: 20 watt -. Pilot power portion = 15% -. Voice Activity : 0.4 -. Traffic Channel Gain : 95 59 95 dB_index (3G) 132 92 128 Output power Watt 3 0.30 2.32 5.62 14.38 20 dBm 34.7 24.7 33.6 37.5 41.5 43 Power Ratio 15% 1% 12% 28% 72% 100% -17.5 (1 user) dB_value -8.25 -18.25 -9.25
CDMA2000网络优化篇（中级）
2-13
Forward Link Power Control Algorithm - RC2
One example of FPC:BTS receive EIB=0 continuously from MS
CDMA2000网络优化篇（中级）
2-14
CDMA2000网络优化篇（中级）
2-3
What is Power Control
Power control is to adjust the output power that can satisfy the reception of a called party and thusmaximize the system capacity in the circumstances of dynamically changing channels, velocities of mobile stations, and call status. If an area where the mobile station is moving with path loss,background noise, or severe fading, its base station should assign more power to traffic channels. Perfect power control is impossible, however, because it cannot but have some errors due to the unbalance between the forward and reverse links, incorrect estimation of the status of channels, or delay of power control.