Huawei Parameter Optimization

  • View
    225

  • Download
    2

Embed Size (px)

Text of Huawei Parameter Optimization

  • Parameter Optimization

  • Review Review

    Parameter optimization is an important step after RF Optimization.

    Parameter optimization improves service quality and utilization of network resources.

  • ReviewReviewNew 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 CellReselection

    EvaluationProcess

    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 Sintersearch, UE need not perform inter-frequency measurements.

    If Sx SsearchRAT m, UE need not perform measurements on cells of RAT m".

    If Sx

  • 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 1