Post on 20-Apr-2017
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Parameter Optimization
Review Review
Parameter optimization is an important step
after RF Optimization.
Parameter optimization improves service
quality and utilization of network resources.
ReviewReview
New Sites Intergrated
Single Site Verification
Cluster of Sites ready ?
RF Optimisation
Services Testing & Parameter Optimisation
Regular Reference RouteTesting & Stats Analysis
Re - optimisation Needed ?
YES
NO
YES
NO
ObjectivesObjectives
Understand the process of parameter
optimization
Master the contents of parameter
optimization
Upon completion of this course, you can:
ContentsContents
Parameter optimization procedure
Parameter optimization contents
Parameter Optimization ProcessParameter Optimization ProcessData Input and Find
Problems
Verify Parameter Problems
Other ProcessClassify Parameter Problems
Determine Parameter Values to be Modified and List MML Commands
Evaluate Changing Effects
Prepare Test Plan and Implement Changing
Test , Get Data again and Compare
Problems Eliminate Or Need not Change more
End
Determine whether Changing
End
N
N
Y
Y
Y
N
Data Input and Find ProblemsData Input and Find Problems
Data Input
Drive Test Data
KPI Network Statistic Data
Network Tracing Message
Network Warning Information
Problems
Find problems from the input data, such as:• Low success rate of call setup• Low success rate of handover• High rate of call drop
Verify Parameter ProblemsVerify Parameter Problems
Parameter Problems
No RF Problems
No Hardware/Software Problem
Related with EnvironmentOr Speed
Parameters never OptimizedBefore
Parameter ClassificationParameter Classification
Mobile Management Parameters
Power Control Parameters
Power Configuration Parameters
Load Control Parameters
Other Parameters
Determine Parameter Values Determine Parameter Values
List the form for changing parameters
(original parameter values vs. new parameter values)
List MML commands for changing parameters
Note:
Maybe some tradeoff considerations need to be considered to assure
the maximal improvement in the whole view such as “coverage and
capacity”,“ fast and stable”, “improvement and risk”, “cost (or efforts)
and gain”.
ImpactImpact
Impact on customer service and other networks
Impact on OMC (efforts, maintenance)
Prepare Test Plan and Change ParametersPrepare Test Plan and Change Parameters
Prepare test schedule, routes, tools and be ready to get
Information.
Change parameters and make records.
Course ContentsCourse Contents
Parameter optimization Procedure
Parameter optimization Contents
Parameter Optimization ContentsParameter Optimization Contents
Mobile Management parameter optimization
Power Control parameter optimization
Power Configuration parameter optimization
Load Control parameter optimization
Note: There are too many parameters to introduce. Only some parameters about network optimization are mentioned here and maybe more parameters need to be added in the future.
Mobile Management Parameter OptimizationMobile Management Parameter Optimization
Cell Selection & Reselection
The changing of cell on which UE camped in idle mode or in Cell FACH, Cell
PCH, URA PCH states. That assures UE camping the most suitable cell,
receiving system information and establishing an RRC connection on a best
serving cell.
Handover
The changing of cells with which UE connected in DCH mode.
That assures seamless coverage and load balancing.
Cell Selection & Reselection ProcedureCell Selection & Reselection Procedure
InitialCell Selection
Any CellSelection
go herewhen noUSIM inthe UE
USIM inserted
Camped onany cell
go here whenever anew PLMN is
selected
1no cell information
stored for the PLMNcell information
stored for the PLMN
Storedinformation
Cell Selectionno suitable cell found
no suitablecell found
Cell Selectionwhen leaving
connectedmode
suitable cell found 2
suitablecell found
Campednormally
suitable cell found
no suitablecell found
leaveidle mode
return toidle mode
Connectedmode
CellReselectionEvaluationProcess
suitablecell found
trigger
no suitablecell found
1
Cell Selectionwhen leaving
connectedmode
no acceptable cell found
acceptablecell found
acceptablecell found
suitablecell found 2
leaveidle mode
return toidle mode
Connectedmode
(Emergencycalls only)
CellReselectionEvaluationProcess
acceptablecell found
trigger
no acceptablecell found
NAS indicates thatregistration on selected
PLMN is rejected(except with cause #14
or #15 [5][16] )
Cell Selection Criteria (S Criteria)
The cell selection criterion S is fulfilled when:
for FDD cells: Srxlev > 0 AND Squal > 0
for TDD cells: Srxlev > 0
Where:
Squal = Qqualmeas – Qqualmin
Srxlev = Qrxlevmeas - Qrxlevmin - Pcompensation
When a UE wants to select a UMTS cell, the cell must satisfy S criterion.
Cell Selection ParametersCell Selection Parameters
Cell Re-selection Measure Condition Cell Re-selection Measure Condition
Use Squal for FDD cells and Srxlev for TDD for Sx
1. If Sx > Sintrasearch, UE need not perform intra-frequency measurements.
If Sx <= Sintrasearch, perform intra-frequency measurements.
If Sintrasearch, is not sent for serving cell, perform intra-frequency measurements.
2. If Sx > Sintersearch, UE need not perform inter-frequency measurements.
If Sx <= Sintersearch, perform inter-frequency measurements.
If Sintersearch, is not sent for serving cell, perform inter-frequency measurements.
3. If Sx > SsearchRAT m, UE need not perform measurements on cells of RAT“ m".
If Sx <= SsearchRAT m, perform measurements on cells of RAT "m".
If SsearchRAT m, is not sent for serving cell, perform measurements on cells of RAT "m".
Cell Reselection Criteria (R Criteria)Cell Reselection Criteria (R Criteria)
All cells should satisfy S Criteria.
Select the Cell with the highest R value using the following method to compute.
Rs = Q meas ,s + Qhyst s
Rn = Q meas ,n - Qoffset s,n
The cells shall be ranked according to the R criteria specified above, deriving Qmeas,n and Qmeas,s and calculating the R values using CPICH RSCP, P-CCPCH RSCP and the averaged received signal level for FDD, TDD and GSM cells, respectively.The offset Qoffset1s,n is used for Qoffsets,n to calculate Rn, the hysteresis Qhyst1s is used for Qhysts to calculate Rs. If an FDD cell is ranked as the best cell and the quality measure for cell selection and re-selection is set to CPICH Ec/No, the UE shall perform a second ranking of the FDD cells according to the R criteria specified above, but using the measurement quantity CPICH Ec/No for deriving the Qmeas,n and Qmeas,s and calculating the R values of the FDD cells. The offset Qoffset2s,n is used for Qoffsets,n to calculate Rn, the hysteresis Qhyst2s is used for Qhysts to calculate Rs. Following this second ranking, the UE shall perform cell re-selection to the best ranked FDD cell.
In all cases, the UE shall reselect the new cell, only if the following conditions are met:- the new cell is better ranked than the serving cell during a time interval Treselection.- more than 1 second has elapsed since the UE camped on the current serving cell.
Cell Reselection Parameters
Cell Reselection ParametersCell Reselection Parameters
Cell Reselection from GSM to UMTSCell Reselection from GSM to UMTS
If the 3G Cell Reselection list includes UTRAN frequencies, the MS shall, at least every 5 s update
the value RLA_C for the serving cell and each of the at least 6 strongest non-serving GSM cells.
The MS shall then reselect a suitable (see TS 25.304) UTRAN cell if its measured RSCP value
exceeds the value of RLA_C for the serving cell and all of the suitable (see 3GPP TS 03.22) non-
serving GSM cells by the value XXX_Qoffset for a period of 5 seconds and, for FDD, the UTRAN
cells measured Ec/No value is equal or greater than the value FDD_Qmin. In case of a cell
reselection occurring within the previous 15 seconds, XXX_Qoffset is increased by 5 dB.
where Ec/No and RSCP are the measured quantities.
FDD_Qmin and XXX_Qoffset are broadcast on BCCH of the serving cell. XXX indicates
other radio access technology/mode.
Note:The parameters required to determine if the UTRAN cell is suitable are broadcast on
BCCH of the UTRAN cell. An MS may start reselection towards the UTRAN cell before
decoding the BCCH of the UTRAN cell, leading to a short interruption of service if the
UTRAN cell is not suitable.
Cell reselection to UTRAN shall not occur within 5 seconds after the MS has reselected a
GSM cell from an UTRAN cell if a suitable GSM cell can be found.
If more than one UTRAN cell fulfils the above criteria, the MS shall select the cell with the
greatest RSCP value.
Cell Reselection Parameters from GSM to UMTS
Cell Reselection Parameters from GSM to UMTS
Handover Procedure
Node B
Node B
Node B
Intra-frequency cells
Neighbor cells both from same NodeB or other NodeBs
Measurement reportMeasurement report
Handover decision Handover decision
Measurement controlMeasurement control
Measurement and filteringMeasurement and filtering
Handover executionHandover execution
Soft Handover Example
Soft Handover ProcedureSoft Handover Procedure
Soft Handover Event – 1ASoft Handover Event – 1A
1A (add a cell in Active Set)
)2/(10)1(1010 11
1aaBest
N
iiNewNew HRLogMWMLogWCIOLogM
A
−−⋅⋅−+
⋅⋅≥+⋅ ∑
=
MNew : the measurement result of the cell entering the reporting range.CIONew : the individual cell offset for the cell entering the reporting range if an individual cell offset is stored for that cell. Otherwise it is equal to 0.Mi : measurement result of a cell not forbidden to affect reporting range in the active set.NA : the number of cells not forbidden to affect reporting range in the current active set.MBest : the measurement result of the cell not forbidden to affect reporting range in the active set with the highest measurement result, not taking into account any cell individual offset.W : a parameter sent from UTRAN to UE.R1a : the reporting range constant.H1a : the hysteresis parameter for the event 1a.
Soft Handover Event – 1BSoft Handover Event – 1B
1B (Remove a cell from Active Set)
)2/(10)1(1010 111
bbBest
N
iiOldOld HRLogMWMLogWCIOLogM
A
+−⋅⋅−+
⋅⋅≤+⋅ ∑
=
MOld : the measurement result of the cell leaving the reporting range.CIOOld : the individual cell offset for the cell leaving the reporting range if an individual cell offset is stored for that cell. Otherwise it is equal to 0.Mi : measurement result of a cell not forbidden to affect reporting range in the active set.NA : the number of cells not forbidden to affect reporting range in the current active set.MBest : the measurement result of the cell not forbidden to affect reporting range in the active set with the lowest measurement result, not taking into account any cell individual offset. W : a parameter sent from UTRAN to UE.R1b : the reporting range constant.H1b : the hysteresis parameter for the event 1b.
Soft Handover Event – 1CSoft Handover Event – 1C
1C (a non-active primary CPICH becomes better than an active
primary CPICH. If Active Set is not full, add the non-active cell into
active set .Otherwise use the cell substitute the active cell.)
2/1010 1cInASInASNewNew HCIOLogMCIOLogM ++⋅≥+⋅
MNew : the measurement result of the cell not included in the active set.CIONew : the individual cell offset for the cell becoming better than the cell in the active set if an individual cell offset is stored for that cell. Otherwise it is equal to 0.MInAS : the measurement result of the cell in the active set with the highest measurement result.MInAS : the measurement result of the cell in the active set with the lowest measurement result.CIOInAS : the individual cell offset for the cell in the active set that is becoming worse than the new cell.H1c : the hysteresis parameter for the event 1c.
Soft Handover Event – 1DSoft Handover Event – 1D
1D (Change of best cell. If the chosen cell is not in Active Set, add
the cell into Active Set and modify measurement control .Otherwise
only modify measurement control. )
2/1010 1dBestBestNotBestNotBest HCIOLogMCIOLogM ++⋅≥+⋅
MNotBest : the measurement result of a cell not stored in "best cell"
CIONotBest : the cell individual offset of a cell not stored in "best cell" .
MBest: the measurement result of the cell stored in "best cell".
CIOBest : the cell individual offset of a cell stored in "best cell" .
H1d : the hysteresis parameter for the event 1d.
Soft Handover ParametersSoft Handover Parameters
Parameter Name Description Default Setting
IntraRelThdFor1A Relative thresholds of soft handover for Event 1A (R1a) 10, namely 5dB (step 0.5)
IntraRelThdFor1B Relative thresholds of soft handover for Event 1B (R1b) 10, namely 5dB (step 0.5)
Hystfor1A, Hystfor1B,
Hystfor1C, Hystfor1D
Soft handover hysteresis (H1x) 6,namely 3dB (step 0.5) for H1a .
8,namely 4dB(step 0.5) for H1b, H1c,H1d.
CellIndividalOffset Cell CPICH measured value offset; the sum of this
parameter value and the actually tested value is used for
UE event estimation. (CIO)
0
WEIGHT Weighting factor, used to determine the relative threshold of
soft handover according to the measured value of each cell
in the active set.
0
TrigTime1A,TrigTime1B,
TrigTime1C,TrigTime1D
Soft handover time-to-trigger parameters (event time-to-
trigger parameters. Only the equation are always satisfied
during the trigger time, the event will be triggered).
D640, namely 640ms .
FilterCoef Filter coefficient of L3 intra-frequency measurement D5,namely 5
Inter-system Handover – CS Domain Procedure
Inter-system Handover – CS Domain Procedure
UE
1. RRC Connect Req
15. RAB Assign Req
NODEB RNC 3G MSC BSS2G MSC
2. RRC Setup Complete
3. Measure Control (measure ID 0x1 )
4. Measure Control (measure ID 0x2 ) 5.Initial UE message(service request)
6.DL DT (Authentication Request)7.UL DT (Authentication Response)
8.Common ID
9. Security Mode Command10. Security Mode Command
11. Security Mode CMP12. Security Mode CMP
13. UL DT(Setup)14. DL DT(Call proceeding)
17.RL Recfg Ready
21 RAB Assign Resp20 RB Setup Cmp
19 RB Setup
16.RL Recfg Prep
18.RL Recfg Commit
22. DL DT( Alerting )23. DL DT( Connect)24. UL DT(Connect Ack)
26.RL Recfg Prep26.RL Recfg Prep
28 PhyCh Reconfig28 PhyCh Reconfig29.RL Recfg Comit29.RL Recfg Comit
27.RL Recfg Ready27.RL Recfg Ready
30 PhyCh Reconfig CMP30 PhyCh Reconfig CMP31 Meaure Control(ID3 )
32Measure Report 33 Relocation Required34 Relocation Command
35. HandoverFromUtranCommand44 Iu Release Req
46 RL Del Resp45 RL Del Req
47 Iu Release Complete
25 Measure Report(2D)
Inter-system Handover Measure Inter-system Handover Measure
1) Use Inter-frequency measurement reporting Event 2d, 2f
to reflect the currently used frequency quality.
Event 2d: The estimated quality of the currently used frequency is below a certain threshold.
The variables in the formula are defined as follows:
QUsed is the quality estimate of the used frequency.
TUsed 2d is the absolute threshold that applies for the used frequency and event 2d.
H2d is the hysteresis parameter for the event 2d.
Event 2f: The estimated quality of the currently used frequency is above a certain threshold.
The variables in the formula are defined as follows:
QUsed is the quality estimate of the used frequency.
TUsed 2f is the absolute threshold that applies for the used frequency and event 2f.
H2f is the hysteresis parameter for the event 2f.
2/22 ddUsedUsed HTQ −≤
2/22 ffUsedUsed HTQ +≥
Inter-system Handover MeasureInter-system Handover Measure
2 ) When Received 2D reports ( that means the currently used frequency signal is poor ), RNC
sends Measurement Control (ID3) to let UE begin to measure other system signal . UE will send
measurement result reports periodically . When Received 2F reports (that means the currently
used frequency signal is not poor), RNC sends Measurement Control (ID3,but different
contents) to let UE stop measuring other system signal .
3) When received the periodical reports, RNC use the following formula to judge whether should
handover UE to another system .
Mother_RAT + CIO > Tother_RAT + H/2
Tother_RAT : the inter-system handover decision threshold;
Mother_RAT : the inter-system (GSM RSSI) measurement result received by RNC;
CIO: Cell Individual Offset, which is the inter-system cell setting offset;
H : refers to hysteresis,
If the formula is met, a trigger-timer called TimeToTrigForSysHo will be started, and a handover decision will be made
when the timer times out;
Note: if the inter-system quality satisfies the following condition before the timer times out:
Mother_RAT + CIO < Tother_RAT - H/2
The timer will be stopped, and RNC will go on waiting to receive the next inter-system measurement report.
The length of the trigger-timer is called time-to-trigger.
Inter-system Handover ParametersInter-system Handover Parameters
Parameter Optimization ContentsParameter Optimization Contents
Mobile Management parameter optimization
Power Control parameter optimization
Power Configuration parameter optimization
Load Control parameter optimization
Power Control parameter optimizationPower Control parameter optimization
Power Control Characteristics
Minimize the interference in the network, thus improve
capacity and quality
Maintain the link quality in uplink and downlink by adjusting
the powers
Mitigate the near far effect by providing minimum required power
level for each connection
Provides protection against shadowing and fast fading
Power Control ClassificationPower Control Classification
UE NodeB RNC
SIR Target
Bler /BerSIR
TPC Command
Outer Loop Power Control
Inner Loop Power Control
Open Loop Power Control
Open Loop Power Control Open loop power control is used to determine UE’s initial uplink transmit power in PRACH and NodeB’s initial downlink transmit power in DPDCH. It is used to set initial power reference values for power control. Outer Loop power controlOuter loop power control is used to maintain the quality of communication at the level of bearer service quality requirement, while using as low power as possible.
Inner loop power control (also called fast closed loop power control)
Inner loop power control is used to adjust UE’s uplink / NodeB’s downlink Dpch Power every one slot
in accordance with TPC commands. Inner loop power control frequency is 1500Hz.
Open Loop Power Control - UplinkOpen Loop Power Control - Uplink
BCH£ºCPICH channel powerBCH£ºCPICH channel power
UL interference leve UL interference leve
Constant Value Constant Value
Measure CPICH_RSCP Measure CPICH_RSCP and determine the initial and determine the initial transmitted power transmitted power
RACHRACH
Preamble_Initial_Power = Primary CPICH TX power - CPICH_RSCP
+ UL interference + Constant Value
where Primary CPICH TX power, UL interference and Constant Value are broadcasted
in the System Information , and CPICH_RSCP is the measured value by UE 。
Open Loop Power Control - DownlinkOpen Loop Power Control - Downlink
DCHDCH
Measure CPICH Ec/I0Measure CPICH Ec/I0
RACH reports the RACH reports the measured valuemeasured value
Determine the downlink initial power Determine the downlink initial power controlcontrol
• Where R is the user bit rate. W is the chip rate (3.84M).
• Pcpich is the Primary CPICH transmit power.
• Eb/Io is the downlink required Eb/Io value for a bearer service.
• (Ec/Io)cpich is measurement value reported by the UE.
•αis downlink cell orthogonal factor.
• Ptotal is the current cell’s carrier transmit power measured at the NodeB
and reported to the RNC.
))/(( totalo
cCPICH
o
b PcpichI
EP
W
R
I
EP ×−××= α
Open Loop Power Control ParametersOpen Loop Power Control Parameters
Outer Loop Power ControlOuter Loop Power Control
SRNC DRNC
Set SIR Set SIR targettarget
Set SIR targetSet SIR target
Set SIR targetSet SIR target
Macro diversity Macro diversity combiningcombining
Outer loop control is used to setting SirTarget (Signal to Interference Ratio Target) for inner loop power control. It is divided into uplink outer loop power control and downlink outer loop power control.
The uplink outer loop power control is controlled by SRNC (serving RNC) for setting a target SIR for each UE. This target SIR is updated according to the estimated uplink quality (Block Error Ratio/ Bit Error Ratio).If UE is not in DTX (Discontinuous Transmission)status (that means RNC can receive uplink traffic data),RNC will use Bler (Block Error Ratio) to compute SirTarget . Otherwise, RNC will use Ber (Bit Error Ratio) to compute SirTarget.
The downlink outer loop power control is controlled by the UE receiver to converge to required link quality (BLER) set by the network (RNC) in downlink.
Outer Loop Power Control ParametersOuter Loop Power Control Parameters
Inner Loop Power ControlInner Loop Power Control
The inner loop power control adjusts the UE or NodeB transmit
power in order to keep the received signal-to-interference ratio
(SIR) at a given SIR target, SIRtarget.
It is also divided into uplink inner loop power control and
downlink inner loop power control.
Uplink Inner Loop Power ControlUplink Inner Loop Power Control
UTRAN behaviour
The serving cells (cells in the active set) should estimate signal-to-interference ratio
SIRest of the received uplink DPCH. The serving cells should then generate TPC
commands and transmit the commands once per slot according to the following rule: if
SIRest > SIRtarget then the TPC command to transmit is "0", while if SIRest < SIRtarget
then the TPC command to transmit is "1".
UE behaviour
Upon reception of one or more TPC commands in a slot, the UE shall derive a single TPC
command, TPC_cmd, for each slot, combining multiple TPC commands if more than one
is received in a slot. This is also valid when SSDT transmission is used in the downlink.
Two algorithms shall be supported by the UE for deriving a TPC_cmd. Which of these
two algorithms is used is determined by a UE-specific higher-layer parameter,
"PowerControlAlgorithm", and is under the control of the UTRAN. If
"PowerControlAlgorithm" indicates "algorithm1", then the layer 1 parameter PCA shall
take the value 1 and if "PowerControlAlgorithm" indicates "algorithm2" then PCA shall
take the value 2.
Uplink Inner Loop Power ControlUplink Inner Loop Power Control
The step size DTPC is a layer 1 parameter which is derived from the UE-specific higher-
layer parameter "TPC-StepSize" which is under the control of the UTRAN. If "TPC-
StepSize" has the value "dB1", then the layer 1 parameter DTPC shall take the value
1 dB and if "TPC-StepSize" has the value "dB2", then DTPC shall take the value 2 dB.
The parameter "TPC-StepSize" only applies to Algorithm 1 . For Algorithm 2 DTPC shall
always take the value 1 dB.
After deriving of the combined TPC command TPC_cmd using one of the two supported
algorithms, the UE shall adjust the transmit power of the uplink DPCCH with a step of
DDPCCH (in dB) which is given by:
DDPCCH = DTPC × TPC_cmd.
Uplink Inner Loop Power ControlUplink Inner Loop Power Control
Algorithm 1 for processing TPC commands
When a UE is not in soft handover, only one TPC command will be received in each
slot. In this case, the value of TPC_cmd shall be derived as follows:
- If the received TPC command is equal to 0 then TPC_cmd for that slot is –1.
- If the received TPC command is equal to 1, then TPC_cmd for that slot is
Algorithm 2 for processing TPC commands
When a UE is not in soft handover, only one TPC command will be received in each
slot. In this case, the UE shall process received TPC commands on a 5-slot cycle,
where the sets of 5 slots shall be aligned to the frame boundaries and there shall
be no overlap between each set of 5 slots.
The value of TPC_cmd shall be derived as follows:
- For the first 4 slots of a set, TPC_cmd = 0.
- For the fifth slot of a set, the UE uses hard decisions on each of the 5
received TPC commands as follows:
If all 5 hard decisions within a set are 1 then TPC_cmd = 1 in the 5th slot.
If all 5 hard decisions within a set are 0 then TPC_cmd = -1 in the 5th slot.
Otherwise, TPC_cmd = 0 in the 5th slot.
Downlink Inner Loop Power ControlDownlink Inner Loop Power Control
UE behaviour
The UE shall generate TPC commands to control the network transmit power
and send them in the TPC field of the uplink DPCCH. The UE shall check
the downlink power control mode (DPC_MODE) before generating
the TPC command: If DPC_MODE = 0 : the UE sends a unique TPC command in each slot and the
TPC command generated is transmitted in the first available TPC field in the uplink
DPCCH;
If DPC_MODE = 1 : the UE repeats the same TPC command over 3 slots and the
new TPC command is transmitted such that there is a new command at the
beginning of the frame.
The DPC_MODE parameter is a UE specific parameter controlled by the
UTRAN.
Downlink Inner Loop Power ControlDownlink Inner Loop Power Control
UTRAN behaviour
Upon receiving the TPC commands UTRAN shall adjust its downlink DPCCH/DPDCH
power accordingly. For DPC_MODE = 0, UTRAN shall estimate the transmitted TPC
command TPCest to be 0 or 1, and shall update the power every slot. If DPC_MODE =
1, UTRAN shall estimate the transmitted TPC command TPCest over three slots to be 0
or 1, and shall update the power every three slots.
Inner Loop Power Control ParametersInner Loop Power Control Parameters
Parameter Optimization ContentsParameter Optimization Contents
Mobile Management parameter optimization
Power Control parameter optimization
Power Configuration parameter optimization
Load Control parameter optimization
Physical Channels TypesPhysical Channels Types
Common Channel ParametersCommon Channel Parameters
All channels’ power refers to PCPICH power expect PCPICH.
Dedicated Channel ParametersDedicated Channel Parameters
Dedicated Channel Power refers to PCPICH Power.
Parameter Optimization ContentsParameter Optimization Contents
Mobile Management parameter optimization
Power Control parameter optimization
Power Configuration parameter optimization
Load Control parameter optimization
Load Control Parameter OptimizationLoad Control Parameter Optimization
Call Admission Control (CAC)
Call admission control is used to control cell’s load by
admission/rejection request to assure a cell’s load under control.
Dynamic Channel Configuration Control (DCCC)
Dynamic Channel Configuration Control is used to dynamically
change a connection’s load to improve cell resource utilization and
control cell’s load.
Call Admission Control Procedure Call Admission Control Procedure
call admisson request arrive
Get the service characteristic and the current load
Uplink call admission control evaluation
admitted ?
Downlink call admission control evaluation
admitted ?
call admitted call rejected
end
n
y
y
n
Call Admission Control ParametersCall Admission Control Parameters
Different service type can be configured different threshold. That means leave some resources for important service ( or request), such as HO > Conversation > Other.Ul(Dl)TotolKThd is used when NodeB load report is not available . It uses equivalent 12.2k-voice users number method.
Dynamic Channel Configuration Control
Dynamic channel configuration control (DCCC) aims to make full use of
radio resource (codes, power, CE )
- Configured bandwidth is fixed with no DCCC- Configured bandwidth is changing with DCCC- Traffic rate
Rate
or
ban
d
DCCC Procedure
Measurement reportMeasurement report
DCCC decisionDCCC decision
Traffic Volume measurement control
Traffic Volume measurement control
UE and RNC MeasurementUE and RNC Measurement
DCCC executionDCCC execution
Traffic Volume Measurement
Threshold
Transport Channel Traffic Volume
Reporting event 4A
Time
Reporting event 4A
Threshold
Transport Channel Traffic Volume
Reporting event 4B
Time
Reporting event 4B
Reporting event 4B
DCCC Decision
1) 4a event report -> increase bandwidth 4b event report -> decrease bandwidth
2) if current bandwidth <= DCCC threshold, do not decrease bandwidth
Dynamic Channel Configuration Control Parameters
Dynamic Channel Configuration Control Parameters
Dynamic Channel Configuration Control Parameters
Dynamic Channel Configuration Control Parameters
SummarySummary
Parameter Optimization improves network quality and solves
network problems.
Parameter Optimization is a complicated procedure and needs
parameter and algorithm knowledge.
Parameter Optimization will be combined with other
optimization activities making network better !