OMC4_B9 MR1 Ed4 Migration Report

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    Migration ReportMigration Report

    BSS software release B9 MR1 ed4B9 MR1 ed4

    OMC4: BKB01OMC4: BKB01BKB14 , NTB01BKB14 , NTB01--NTB24 and 10 Central BSCNTB24 and 10 Central BSC

    True MoveMay 30, 2006

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    B9 MR1 ed4 Migration Report 2 All rights reserved 2003, Alcatel

    Contents

    Section2: GPRSSection2: GPRS QoSQoS

    Data volume (DL/UL)

    Annex

    Section1: GSMSection1: GSM QoSQoS

    HO causes

    GSM QoS follow up GPRS QoS follow upTraffic Analysis (TCH/SDCCH) Radio resource allocation (DL/UL)

    Assignment failures rate (TCH/SDCCH) Radio resource de-allocation (DL/UL)Call setup success rate Data transfer efficiency (DL/UL)Drop rate (TCH/SDCCH) Data throughput (DL/UL)Incoming HOSR

    Outgoing HOSRGPRS Parameters follow upGPRS Conclusion

    GSM Parameters follow up

    GSM Conclusion

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    B9 MR1 ed4 Migration Report 3 All rights reserved 2003, Alcatel

    Introduction

    The purpose of this report is to analyze the radio network performance in term of QoSimpact, before and after BSS software migration (B9 MR1 ed4) on OMC4: BKB01OMC4: BKB01BKB14 , NTB01BKB14 , NTB01--NTB24 and 10 Central BSC.NTB24 and 10 Central BSC.

    The BSS migrations was performed during May 3rd-15th ,2006.

    The analysis is based on the Daily statistics of 37 days before and after the migration.

    9 15 days reference data before migration

    9 22 days during/after migration9 Remark: Missing statistics during 17/05-20/05 due to RNO tool database problem.

    The report is presented in 2 sections:

    Section1: GSM QoS Observation

    Section2: GPRS QoS Observation

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    Section1: GSM QoS ObservationGSM QoS Observation

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    GSMGSM QoSQoS

    Traffic Analysis

    Observation:

    Half rate and Full rate traffics are

    constant after migration.

    Migrated

    RTCH traffic model

    0

    100000

    200000

    300000400000

    500000

    600000

    700000

    04/17/20

    06

    04/19/20

    06

    04/21/20

    06

    04/23/20

    06

    04/25/20

    06

    04/27/20

    06

    04/29/20

    06

    05/01/20

    06

    05/03/20

    06

    05/05/20

    06

    05/07/20

    06

    05/09/20

    06

    05/11/20

    06

    05/13/20

    06

    05/15/20

    06

    05/17/20

    06

    05/19/20

    06

    05/21/20

    06

    05/23/20

    06

    05/25/20

    06

    0

    20

    40

    60

    80

    100

    120

    Half Erlang totFull Erlang tot

    MHT_TCH

    Migrated

    Observation:

    SDCCH traffic and MHT are

    stable after migration.

    MigratedSDCCH traffic model

    05000000

    1000000015000000200000002500000030000000

    35000000400000004500000050000000

    04/17/20

    06

    04/19/20

    06

    04/21/20

    06

    04/23/20

    06

    04/25/20

    06

    04/27/20

    06

    04/29/20

    06

    05/01/20

    06

    05/03/20

    06

    05/05/20

    06

    05/07/20

    06

    05/09/20

    06

    05/11/20

    06

    05/13/20

    06

    05/15/20

    06

    05/17/20

    06

    05/19/20

    06

    05/21/20

    06

    05/23/20

    06

    05/25/20

    06

    0

    0.5

    1

    1.52

    2.5

    3

    3.5

    SDCCH_trafficSDTRMHT

    Migrated

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    GSMGSM QoSQoS

    Assignment Failure RateObservation:

    %TCH Assignment failures Radio &

    BSS are improved from 0.6% to

    0.48% by solve TRE faulty at

    NTB8002_S1, PTT1030_S3 &

    SPB8001_S2.%TCH Block is stable at 0.15%.

    Negative value of prep fail BSS is

    solved by correction on MC140a

    counter after migration.

    Migrated

    RTCH assign success

    0

    200000400000

    600000

    8000001000000

    1200000

    14000001600000

    1800000

    04/17/20

    06

    04/19/20

    06

    04/21/20

    06

    04/23/20

    06

    04/25/20

    06

    04/27/20

    06

    04/29/20

    06

    05/01/20

    06

    05/03/20

    06

    05/05/20

    06

    05/07/20

    06

    05/09/20

    06

    05/11/20

    06

    05/13/20

    06

    05/15/20

    06

    05/17/20

    06

    05/19/20

    06

    05/2

    1/20

    06

    05/23/20

    06

    05/25/20

    06

    0

    0.2

    0.4

    0.60.8

    1

    1.2

    1.4

    1.6

    Fail Radio

    Exe Fail BSS

    Prep Fail BSS

    Congestion

    % Fail TCH R&B

    % TCH AssBlock

    Migrated

    Observation:

    %Assignment failures SDCCH is

    stable at 3.4%.

    %SD Assignment Block is remain

    stable.

    Migrated

    SDCCH assignment failure

    0

    500000

    1000000

    1500000

    2000000

    2500000

    3000000

    04/17/20

    06

    04/19/20

    06

    04/2

    1/20

    06

    04/23/20

    06

    04/25/20

    06

    04/27/20

    06

    04/29/20

    06

    05/0

    1/20

    06

    05/03/20

    06

    05/05/20

    06

    05/07/20

    06

    05/09/20

    06

    05/1

    1/20

    06

    05/13/20

    06

    05/15/20

    06

    05/17/20

    06

    05/19/20

    06

    05/2

    1/20

    06

    05/23/20

    06

    05/25/20

    06

    0

    1

    2

    3

    4

    5

    6

    7

    Fail - Radio

    Fail - BSS

    SD - Block% Fail

    % SD AssBlock

    Migrated

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    GSMGSM QoSQoS

    Call Setup Success Rate

    Observation:

    CSSR remain stable at 98.4%

    SDCCH drop & SDCCH

    congestion are remain stable.

    Migrated

    Call success

    0

    500000

    1000000

    1500000

    2000000

    2500000

    04/17/20

    06

    04/19/20

    06

    04/21/20

    06

    04/23/20

    06

    04/25/20

    06

    04/27/20

    06

    04/29/20

    06

    05/01/20

    06

    05/03/20

    06

    05/05/20

    06

    05/07/20

    06

    05/09/20

    06

    05/11/20

    06

    05/13/20

    06

    05/15/20

    06

    05/17/20

    06

    05/19/20

    06

    05/21/20

    06

    05/23/20

    06

    05/25/20

    06

    85

    87

    89

    91

    93

    95

    97

    99

    101

    Assign Unsucc

    SDCCH drop

    SD_Block

    % Call success

    % Call setup

    Migrated

    *Note : CSSR = (1-SDCCH drop)*(1-TCH assign unsucc)

    Call success (exclude TCH prep fail)

    0

    200000

    400000

    600000

    800000

    1000000

    1200000

    1400000

    1600000

    04/17/20

    06

    04/19/20

    06

    04/21/20

    06

    04/23/20

    06

    04/25/20

    06

    04/27/20

    06

    04/29/20

    06

    05/01/20

    06

    05/03/20

    06

    05/05/20

    06

    05/07/20

    06

    05/09/20

    06

    05/11/20

    06

    05/13/20

    06

    05/15/20

    06

    05/17/20

    06

    05/19/20

    06

    05/21/20

    06

    05/23/20

    06

    05/25/20

    06

    85

    87

    89

    91

    93

    95

    97

    99

    101

    Fail TCH R&B

    SDCCH drop

    SD_Block

    % Call success

    % Call setup

    Migrated

    Observation:

    CSSR (excluding TCH prep

    failure BSS) remains stable

    about 98.6%.CSSR = (1- SDCCH drop)*(1-

    TCH assign fail Radio & BSS).

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    GSMGSM QoSQoS

    Drop Rate

    Observation:

    Call drop rate remains stable about

    1.3% after migration. There are 2

    days with increasing of BSS RTC

    drop. There is transmission problemat BKF0041_2 on 10/05- 12/05, and

    at BKA1030_1, BKA1077_1,2,3 on

    13/05.

    .

    Migrated

    Call drop

    0

    50000

    100000

    150000

    200000

    250000

    300000

    350000

    04/17/20

    06

    04/19/20

    06

    04/2

    1/20

    06

    04/23/20

    06

    04/25/20

    06

    04/27/20

    06

    04/29/20

    06

    05/01/20

    06

    05/03/20

    06

    05/05/20

    06

    05/07/20

    06

    05/09/20

    06

    05/1

    1/20

    06

    05/13/20

    06

    05/15/20

    06

    05/17/20

    06

    05/19/20

    06

    05/21/20

    06

    05/23/20

    06

    05/25/20

    06

    0

    0.5

    1

    1.5

    2

    2.5

    Preemption

    Drop - BSS RTC

    Drop BSS Intern

    Drop - HO

    Drop - Radio

    % RTCH drop

    % Call Drop

    Migrated

    SDCCH Drop

    0

    50000

    100000150000

    200000

    250000

    300000

    350000

    400000

    04/17/20

    06

    04/19/20

    06

    04/21/20

    06

    04/23/20

    06

    04/25/20

    06

    04/27/20

    06

    04/29/20

    06

    05/01/20

    06

    05/03/20

    06

    05/05/20

    06

    05/07/20

    06

    05/09/20

    06

    05/11/20

    06

    05/13/20

    06

    05/15/20

    06

    05/17/20

    06

    05/19/20

    06

    05/21/20

    06

    05/23/20

    06

    05/25/20

    06

    0

    0.2

    0.4

    0.6

    0.8

    1

    1.2

    Drop - Radio

    Drop - BSS

    % Drop

    Migrated

    Observation:

    %Drop_SDCCH is remain stable at

    0.85%.

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    GSMGSM QoSQoS

    Incoming HOSR

    Observation:

    Incoming intra BSC HO failure

    rate is stable around 3.5%.

    Incoming Intra BSC handovers

    0

    2000000

    4000000

    60000008000000

    10000000

    12000000

    14000000

    16000000

    04/17/20

    06

    04/19/20

    06

    04/21/20

    06

    04/23/20

    06

    04/25/20

    06

    04/27/20

    06

    04/29/20

    06

    05/01/20

    06

    05/03/20

    06

    05/05/20

    06

    05/07/20

    06

    05/09/20

    06

    05/11/20

    06

    05/13/20

    06

    05/15/20

    06

    05/17/20

    06

    05/19/20

    06

    05/21/20

    06

    05/23/20

    06

    05/25/20

    06

    012345

    6789

    Fail - Radio

    Fail - BSS

    Success

    Prep Fail

    Congestion

    % Fail

    % Cong

    Migrated

    Observation:

    Incoming inter BSC HO

    failure rate is stable at 5.2%.

    Incoming Inter BSC handovers

    0500000

    1000000150000020000002500000

    3000000350000040000004500000

    04/17/20

    06

    04/19/20

    06

    04/21/20

    06

    04/23/20

    06

    04/25/20

    06

    04/27/20

    06

    04/29/20

    06

    05/01/20

    06

    05/03/20

    06

    05/05/20

    06

    05/07/20

    06

    05/09/20

    06

    05/11/20

    06

    05/13/20

    06

    05/15/20

    06

    05/17/20

    06

    05/19/20

    06

    05/21/20

    06

    05/23/20

    06

    05/25/20

    06

    0

    2

    4

    6

    8

    10

    12

    Fail - Radio

    Fail - BSS

    Success

    No CIC alloc

    Prep Fail

    Congestion

    % Fail

    % Cong

    Migrated

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    GSMGSM QoSQoS

    Outgoing HOSR

    Observation:

    Outgoing intra BSC HO drop

    and ROC are stable after

    migration.

    Outgoing Intra BSC handovers

    0

    2000000

    4000000

    60000008000000

    10000000

    12000000

    14000000

    16000000

    04/17/20

    06

    04/19/20

    06

    04/21/20

    06

    04/23/20

    06

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    06

    04/27/20

    06

    04/29/20

    06

    05/0

    1/20

    06

    05/03/20

    06

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    06

    05/15/20

    06

    05/17/20

    06

    05/19/20

    06

    05/21/20

    06

    05/23/20

    06

    05/25/20

    06

    0

    1

    2

    3

    4

    5

    6

    Drop - Radio

    Drop - BSS

    ROC

    Success

    Prep Fail

    % Drop

    % ROC

    Migrated

    Outgoing Inter BSC handovers

    0500000

    10000001500000200000025000003000000350000040000004500000

    04/17/20

    06

    04/19/20

    06

    04/21/20

    06

    04/23/20

    06

    04/25/20

    06

    04/27/20

    06

    04/29/20

    06

    05/01/20

    06

    05/03/20

    06

    05/05/20

    06

    05/07/20

    06

    05/09/20

    06

    05/11/20

    06

    05/13/20

    06

    05/15/20

    06

    05/17/20

    06

    05/19/20

    06

    05/21/20

    06

    05/23/20

    06

    05/25/20

    06

    0

    1

    2

    3

    4

    5

    6

    Drop - Radio

    Drop - BSS

    ROC

    Success

    Prep Fail

    % Drop

    % ROC

    Migrated

    Observation:

    Outgoing inter BSC HO drop and

    ROC are stable after migration.

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    GSMGSM QoSQoS

    HO causes

    Observation:

    HO causes distribution is

    remain stable after migration.

    Handover Causes

    0%

    20%

    40%

    60%

    80%

    100%

    04/17/20

    06

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    05/01/20

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    05/05/20

    06

    05/07/20

    06

    05/09/20

    06

    05/1

    1/20

    06

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    06

    05/25/20

    06

    0

    5

    10

    15

    20

    25

    % Interf

    % Traffic

    % Level

    % Quality

    % Better Cell

    % DL Qual

    % DL Level

    Migrated

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    PARAMETERSPARAMETERS

    GSM Parameters Follow-up

    > Section 1: Cell parameters

    All GSM Parameters are not changed.

    > Section 2: Adjacency parameters ParameterOUTDOOR_UMB_LEV is changed from B8 default parameter during

    migration which is minor impact to user. Its already corrected follow TRUE Moveparameters template by Alcatel OMCR team.

    Detail in attach file.

    GSM Adjacencyparameter

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    CONCLUSIONCONCLUSION

    GSM Conclusion

    > QoS follow up Main QoS are stable after migration.

    > Parameter follow up ParameterOUTDOOR_UMB_LEV is already corrected.

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    Section2: GPRS QoS ObservationGPRS QoS Observation

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    GPRSGPRS QoSQoS

    Radio Resource AllocationObservation:

    % DL TBF establishment success

    is decrease from 95% to 89% due

    to Radio congestion and BSS fail

    causes.

    Retune parameter MIN_PDCH =MAX_PDCH_HL will apply and

    observe the result.

    Service Request is created, its

    under investigation by CTAC.

    Observation:%UL TBF establishment success

    decrease from 95% to 86% due to

    Radio congestion and Radio fail

    causes.

    Radio fail is detected by QoS Alerter

    and solve it by re- initial GPRS. Seedetails in Annex1.

    Radio congestion occur due to new

    algorithm of resource management.

    Retune parameter MIN_PDCH =

    MAX_PDCH_HL will apply and

    observe the result.

    Downlink TBF Establishment

    01000000200000030000004000000

    50000006000000700000080000009000000

    04/17/20

    06

    04/19/20

    06

    04/21/20

    06

    04/23/20

    06

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    06

    04/27/20

    06

    04/29/20

    06

    05/01/20

    06

    05/03/20

    06

    05/05/20

    06

    05/07/20

    06

    05/09/20

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    05/11/20

    06

    05/13/20

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    06

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    06

    05/19/20

    06

    05/21/20

    06

    05/23/20

    06

    05/25/20

    06

    50556065707580859095100

    BSS fail

    Gb fail

    Radio fail

    Radio Cong

    Request

    % Success

    Uplink TBF Establishment

    0

    5000000

    10000000

    15000000

    20000000

    25000000

    04/17/20

    06

    04/19/20

    06

    04/21/20

    06

    04/23/20

    06

    04/25/20

    06

    04/27/20

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    04/29/20

    06

    05/01/20

    06

    05/03/20

    06

    05/05/20

    06

    05/07/20

    06

    05/09/20

    06

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    06

    05/13/20

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    05/21/20

    06

    05/23/20

    06

    05/25/20

    06

    50

    60

    70

    80

    90

    100

    BSS fail

    Gb fail

    Radio fail

    Radio Cong

    Request

    % Success

    Migrated

    Migrated

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    GPRSGPRS QoSQoS

    Radio Resource De-allocation

    Observation:

    % DL Normal release is remain

    stable around 93.6%.

    Downlink Data Transfer

    0

    1000000

    2000000

    3000000

    4000000

    5000000

    6000000

    7000000

    04/17/20

    06

    04/19/20

    06

    04/21/20

    06

    04/23/20

    06

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    06

    04/27/20

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    04/29/20

    06

    05/01/20

    06

    05/03/20

    06

    05/05/20

    06

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    06

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    06

    05/11/20

    06

    05/13/20

    06

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    06

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    06

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    06

    05/21/20

    06

    05/23/20

    06

    05/25/20

    06

    505560657075

    80859095100 BSS pb

    Gb drop

    Realloc drop

    Blocking dropStagnat drop

    Radio drop

    Estab Success

    % Norm Release

    Migrated

    Observation:

    % UL Normal release is slightly

    decrease from 94.8% to 94.2%

    due to reallocation drop cause.

    Its related with new definition ofUL TBF T2 Reallocation (new

    algorithm M- EGCH Statistical

    Multiplexing) , see details in

    Annex2.

    Uplink Data Transfer

    0200000040000006000000800000010000000

    1200000014000000160000001800000020000000

    04/17/20

    06

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    06

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    06

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    06

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    06

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    06

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    06

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    06

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    06

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    06

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    06

    505560657075

    80859095100 BSS pb

    Gb drop

    Realloc drop

    Blocking pb

    Stagnat pb

    Radio drop

    Estab Success

    % Norm Release

    Migrated

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    GPRSGPRS QoSQoS

    Data Transfer Efficiency

    Observation:

    DL CS1 useful is increased to

    more that 90% on BSC that

    connect with MFS002. Its under

    investigation at MFS side.

    DL CS2 useful is decreased which

    link with 90% CS1 usage on BSC

    that connect with MFS002.

    GPRS DL useful RLC traffic

    0

    50000000

    100000000

    150000000

    200000000

    250000000

    300000000

    04/17/20

    06

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    06

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    06

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    06

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    06

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    06

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    06

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    06

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    06

    05/05/20

    06

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    06

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    06

    05/11/20

    06

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    06

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    06

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    06

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    06

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    06

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    06

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    06

    0

    20

    40

    60

    80

    100

    120

    CS4 usef

    CS3 usef

    CS2 usef

    CS1 usef

    %io CSx usef

    Migrated

    GPRS UL useful RLC traffic

    01000000020000000300000004000000050000000

    60000000700000008000000090000000

    100000000

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    06

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    06

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    06

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    06

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    06

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    06

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    06

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    06

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    06

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    06

    05/11/20

    06

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    06

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    06

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    06

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    0

    20

    4060

    80

    100

    120

    CS4 usef

    CS3 usef

    CS2 usefCS1 usef

    %io CSx usef

    Migrated

    Observation:

    UL CS1 useful is stable.

    UL CS2 useful is decrease. This

    change is relate with DL CS1

    useful increased to more that 90%

    on BSC that connect with MFS02.

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    GPRSGPRS QoSQoS

    Data Throughput

    Observation:

    DL Throughput per TBF remains

    stable.

    DL EGPRS radio throughput

    0

    2

    4

    6

    8

    10

    12

    14

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    Kbit/s per TBF

    Migrated

    UL EGPRS radio throughput

    0

    2

    4

    6

    8

    10

    12

    14

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    06

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    Kbit/s per TBF

    Migrated

    Observation:

    UL Throughput per TBF remains

    stable.

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    GPRSGPRS QoSQoS

    Data Volume

    Observation:

    DL Data volume is decrease since

    09/05/06. This change is relate with

    DL CS1 useful increased to more

    that 90% on BSC that connect withMFS02.

    DL Data volume

    0

    2000000000

    4000000000

    6000000000

    8000000000

    10000000000

    12000000000

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    06

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    06

    Data (bytes)

    Migrated

    Observation:

    UL Data volume is decrease since

    09/05/06. This change is relate

    with DL CS1 useful increased to

    more that 90% on BSC thatconnect with MFS02.

    .

    UL Data Volume

    0

    500000000

    10000000001500000000

    2000000000

    2500000000

    3000000000

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    06

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    06

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    06

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    06

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    06

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    06

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    Data (bytes)

    Migrated

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    PARAMETERSPARAMETERS

    GPRS Parameters Follow-up

    > Section 1: Cell parameters

    ParameterBS_CV_MAX (BSC) is changed follow new default value in B9.

    Detail in attach file.

    > Section 2: Adjacency parameters

    ParameterAGprsNcReselectHysteresiswhich is changed from B8 defaultparameter during migration which is not impact to user. This parameter will becorrected follow TRUE Move parameters template by PRC after finish migrated

    OMC4. Detail in attach file.

    GPRS Cellparameter

    GPRS Adjacencyparameter

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    CONCLUSIONCONCLUSION

    GPRS Conclusion

    > QoS follow up Downlink TBF establishment Success Rate decrease due to Radio congestion and BSS

    failure causes.

    => Service Request is created. Its under investigation by CTAC.

    Uplink TBF establishment Success Rate decrease due to Radio failure and Radiocongest causes.

    Service Request is created. Its under investigation by CTAC.

    DL CS1 useful is increased to more than 90%.

    =>Under investigation at MFS side.

    Recommendation Radio failure which is occur on some cell can be detected by QoS Alerter.

    Solve by re-initial GPRS.

    Radio congestion which is occur on some cell can be improved by retune parameter

    MIN_PDCH = MAX_PDCH_HIGH_LOAD to obtain same behavior in B8 release.

    > Parameter follow up There is 1 Adjacency parameter difference from B8 default parameter which is not impact

    to user. It will be corrected follow TRUE Move parameters template by PRC after finish

    migrated OMC4.

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    Annex1: QoS Alerter : sleeping GPRS cell (1)

    >Sleeping GPRS cell: UL TBF Establish Failure Radio cause QoS alerter Scope: ENDTIME>@DAY, 7:00" && ENDTIME100) && ((QRUTERPN/TRUTERQN)>0.8)

    Clearance Predicate: ((QRUTERPN/TRUTERQN)Sleeping GPRS cell: UL TBF Establish Failure BSS cause QoS alerter Scope: ENDTIME>@DAY, 7:00" && ENDTIME100) && (((TRUTERQN-QRUTEGPN-QRUTERPN-QRUTECGN-TRUTESUN)/TRUTERQN)>0.8)

    Clearance Predicate: ((QRUTERPN/TRUTERQN)

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    Annex1: QoS Alerter : sleeping GPRS cell (2)

    >Sleeping cell: QoS alerter Scope: ENDTIME>@DAY, 7:00" && ENDTIME=0)

    && (P91a+P91b+P91c+P91d+P91e+P91f==0 )Clearance Predicate: (P30a + P30b + P30c>0)||(P91a+P91b+P91c+P91d+P91e+P91f >0 )Table: GPRS: CELL

    Stability (mins): 360

    Value can be adaptedNote that with this alerter the cell can be sleeping or without PS traffic.

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    Annex2: Increase of UL Reallocation T2 request & success rate

    > By New algorithm M-EGCH Statistical Multiplexing, P404b counter definition(NB_UL_RES_REALLOC_REQ_T2) has changed between B8 and B9. The definition ofa TBF candidate for T2 reallocation is different, so comparing B8 and B9 values is notrelevant for T2 counters.

    As a general rule, fewer constraints on Abis/Ater in B9 (due to dynamic Abis Allocationand M-EGCH Statistical-Multiplexing)

    more possibilities for T2 TBF reallocations to succeed.

    Number of T2 TBF reallocation failure radio is taken into account forReallocationdrop in data transfer period.

    UL resource realloc T2

    0500000

    10000001500000200000025000003000000350000040000004500000

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    010203040

    5060708090100

    External stop

    Radio fail

    BSS fail

    Prep failSuccess

    % Success

    Migrated

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    Annex3: Increase of UL CS1 usage rate in B9

    > Explained by the fact that the DL TBF drops due to bad radio conditions are delayed inB9 through the following parameter modification

    Default value of N3105_LIMIT changed from 16 to 20

    Default value of EGPRS_N3105_LIMIT changed from 16 to 20

    Default value of N_stagnating_Window_DL_LIMIT changed 10 from to 32

    Creation of a new parameter : MIN_RLF_TIME_DL. Default value : 4 seconds

    > These parameters have been modified due to :

    Introduction of statistical multiplexing and dynamic Abis features

    Mechanism in RLC for detection of radio link failure must take into account possible lack oftransmission resource, thus reducing the radio throughput

    > When DL TBF drops are delayed in case of bad radio conditions

    the mechanism linked to TBF_CS_DL is more often triggered and it can explain why the CS1usage rate is increased in B9 release.

    TBF_CS_DL : threshold defining the number of consecutive Packet Downlink Ack/Nack notreceived above which the coding scheme of a downlink acknowledged or unacknowledged TBFis changed to CS1

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    www.alcatel.com