Multi-criteria meta-parameter tuning for mono-objective stochastic metaheuristics
Parameter Tuning for DPCH_v4_penting
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Transcript of Parameter Tuning for DPCH_v4_penting
1 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials
Company Confidential
Optimization based on Ptx pwr & DYLO statistic
Apr. 2006
C&I, Network Design & Performance
James & water
Nokia Taiwan
2 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials
Company Confidential
ProblemBig Coverage
Link power unbalance
Many Users
Code blocking &
Short of CE or Transmission
High radio link power
Big Interference Radio link rejection or shortage
& Handover fail
High BLER & Lower Ec/No
Coverage hole Poor Network Quality (call failure)
3 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials
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Which cells need to trace??
•Cells can be defined as following;-. Overloaded cells which require Ptx power more than 43dBm
-. Overloaded cells with high code, CE and transmission blocking ratio
-. Cells with big coverage ( radio link power limited cells )
• Phase 1 & 2 cells use 20W(43dBm) WPA but Phase 3 cells use 40W(46dBm). Nevertheless, Radio link power parameters are set to the same value as following;
PtxDPCHMax : -3dB
PtxDPCHMin : -28dB
PtxDLabsMax : 50dBm
What is current issue??
4 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials
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Overloaded cells
Some cells reach overload power range over 43dBm
5 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials
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Current CHT network summary (only North area)
This statistic is calculated from counter data for 10days .
Most of overloaded cells come from Ph3 sites
Percentage out of total overloaded cells in each phase
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e.x) 38577_coverage overlay too much
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Tuning parameter
• What are benefits from changing
“Minimum DPCH -31dB and PtxDLabsMax 40dBm“ ??
- Share Radio link resources among 3G users
- Ptx power to be operated within Marginal load areaMarginal load area
- Can prevent UE from suddenly getting worse Ec/No and Eb/No so that provide stable cell coverage
- No need to transmit unnecessary power for users closed to sites so that can improve Ec/No
- Handover performances can be improved so call drop ratio will be decreased.
8 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials
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Downlink Radio power from E2K after changing
SF8
SF16
SF128
SF256
Sometime downlink power needs more than max. 31dBm for Voice
9 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials
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SF8
SF16
SF128
SF256
Sometime downlink power needs more than max. 41dBm for PS 384K
Downlink Radio power from E2K before changing
10 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials
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RL pwr for SF8 & SF16 After & Before changing
SF8
SF16
Max. 38dBm
Max. 41dBm
Min. 21.5dBm
Min. 25dBm
After
After
Before
Before
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SF128
SF256
Min. 18dBm
Min. 15dBm
Min. 18dBm
Min. 15dBm
After
After
Before
Before
RL pwr for SF128 & SF256 After & Before changing
12 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials
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8577U set to 40dBm
Not Overloaded any more
Overloaded
PtxDLabsMax
40dBm
50dBm
13 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials
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8561U set to 40dBm
Not Overloaded any more
Overloaded
PtxDLabsMax
40dBm
50dBm
14 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials
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3369U without changing
Still Overloaded
15 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials
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8374U without changing
Still Overloaded
16 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials
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DYLO_8577U
After changing, REC_PREP_MOD ratio due to DYLO could be
increased
17 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials
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Current CHT network summary (only North area)
This statistic is calculated from counter data for 10days .
Most of overloaded cells come from Ph3 sites
Percentage out of total overloaded cells in each phase
18 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials
Company Confidential
Dynamic Link Optimization in PS
20 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials
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RL Reconfiguration Counters: Prepare
• Counters incremented when RNC sends RADIO LINK RECONFIGURATION PREPARE message:
REC_PREP_SRNCREC_PREP_SRNC
RECONF_PREP_DCH_ADD_SRNCRECONF_PREP_DCH_ADD_SRNC
RECONF_PREP_DCH_DEL_SRNCRECONF_PREP_DCH_DEL_SRNC
1 for each PREPARE 1 for each PREPARE message (SRNC and message (SRNC and DRNC)DRNC)
1 for each DCH addition 1 for each DCH addition requested in the message requested in the message SRNC and DRNCSRNC and DRNC
1 for each DCH deletion 1 for each DCH deletion requested in the message requested in the message SRNC and DRNCSRNC and DRNC
REC_PREP_MOD_DYN_LNK_SRNCREC_PREP_MOD_DYN_LNK_SRNC1 for each DCH modification due 1 for each DCH modification due to DyLo requested in the to DyLo requested in the message SRNC onlymessage SRNC only
21 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials
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DYLO statistics
For some cells REC_PREP_MOD ratio due to DYLO is more than 30%
22 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials
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Ex.2) cell 3357 with high DYLO attempt
23 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials
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Example DLO : PtxDLabsMax 50 dBm, PtxTotalMax 43dBm/46dBm
DL
pw
r (d
Bm
)
PtxTotalMax 43dBm/46dBm
PtxPrimaryCPICH 33dBm
PtxPrimaryCPICH – CPICHtoRefRABoffset = 31 dBm
PtxDLabsMax 50 dBm
Calculated max RL pwr
Calculated max RL pwr - DLOptimisationPwrOffset
• This is where DLO triggers. (If PtxDLabsMax is set high)•384kbps:38dBm•128kbps:37.387dBm
Default hidden value is 2dB
reftxP ,
max,txP
Ptx, threshold
384kbps:40dBm
128kbps:39.387dBm
24 © 2005 Nokia V1-Filename.ppt / yyyy-mm-dd / Initials
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PtxDPCHMax
• Parameter defines the maximum code channel output power for the power control dynamic range of BTS. The maximum transmission power is calculated by adding the value of the parameter to the BTS maximum output power (Pmax in dBm).
range: -3 ... 0dB , step 0.1dBdefault: -3 dB
PtxDPCHMin
• Parameter defines the minimum code channel output power for the power control dynamic range of BTS. Minimum transmission power is calculated by adding the value of the parameter to the BTS maximum output power (Pmax in dBm).
range: -60 ... –28dB , step 1dBdefault: -28 dB
Relevant DL Power Parameters
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PCrangeDL
• The parameter defines the downlink power control range in relation to the maximum allocated transmission power of the radio link
• The minimum transmission power is achieved by subtracting the value of the parameter from the maximum transmission power of the radio link
• However, the minimum BTS output power of the code channel defines the absolute lower limit for the minimum transmission power
range: 0 ... 25 dB, step 1 dB default: 18dB
DL Power Control Dynamic Range
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Planned Maximum DL Ptx of the Radio Link
PtxDLabsMax
• The planned maximum downlink transmission power of radio link. This parameter is used in the downlink power allocation when CCTrCH includes one or more DCH's of interactive or background traffic class RAB's. The allocated power of a radio link cannot exceed the value of this parameter. The parameter is set separately for each cell. This parameter is the planned maximum, not the physical limit.
range: -10 ... 50 dBm, step 0.1 dBm
default: 50 dBm