KPI307 Busy Hour Dropped Call Rate v4.0

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Busy hour dropped call rate TCH [%]

Document reference: KPI307 V4.0

Data source-independent description

Abstract definition: Monthly average working day network Busy Hour dropped calls divided by the monthly average working day network Busy Hour established calls.

Trigger points:

Counters involved

Global Trigger Point Signalling flow from [network node]

Signalling flow to [network node]

Drop Total successful established calls ( BSSMAP DT1-Assignment Complete ( Assigning a TCH ) ) - Normal (TCH) Call Releases ( Reception of BSSMAP DT1-Clear Command ( Cause Call control ) )

MSC

MSC

BSC

BSC

Establishments BSSMAP DT1-Assignment Complete (Assigning a TCH)

MSC

BSC

Notes on trigger points: BUSY HOUR definition: Busy hour is that when there is a maximum allocation of TIME SLOTS (TCHs + SDCCHs ). In order to derive busy, aggregation statistics of the whole cells have to be considered instead of deriving busy hour individually for each cell

Data source-specific description

Data source: Network Elements (counters)

Measurement period: MAWD

Network element: Ericsson BSS Start: BSS R9.1 End: open

hour.busynetworkdayworkingaverageHourthewhere

Last

FirstCellTHCASSALLTFCASSALL

Last

FirstCell)THNDROP

HourTHNDROPSUB(TFNDROP

*100Percentage

Callsd%BH_Droppe

=

∑=

⎟⎠⎞

⎜⎝⎛

+++

∑=

+++

=

HourHourTFCASSALL

HourBTHCASSALSU

Hour

HourHourTFNDROPSUB

Hour






Network element: Siemens BSS Start: BR7.0 End: open

( )


Last

FirstCell...,5)TASSUCC(2,

Last

FirstCell),...,36)(NRFLTCH(1

*100Percentage

Callsd%BH_Droppe

=

∑=

∑=

++

=

Hour

HourUNIHIRLCHourUNIHIALCHour




Network element: Nokia BSS Start: BSS10.5 End: 11

( )


Last

FirstCell Hour4057 Hour4044 Hour1009

Last

FirstCell )Hour

1088 Hour

1087 Hour

1085 Hour

1084 Hour

1081 Hour 1050

Hour

1049 Hour

1048 Hour

1047 Hour

1046 Hour

1030 Hour

1029 Hour

1014 Hour (1013

*100

_%

=

∑=

++

∑= +++++

++++++++

=percentagecall

DroppedBH

• 1009 (Success TCH seizure for normal assignment) • 1013 (Transactions ended due to radio failure) • 1014 (Transact. ended due source channel failure during HO) • 1029 (TCH transcoder failure) • 1030 (TCH transcoder failure source) • 1046 (TCH LAPD failure) • 1047 (TCH BTS failure) • 1048 (TCH user actions) • 1049 (TCH BCSU reset) • 1050 (TCH network actions) • 1081 (TCH activation failure call) • 1084 (TCH Abis failure call) • 1085 (TCH Abis failure source)



• 1087 (TCH A interface failure call) • 1088 (TCH A interface failure source) • 4044 (MSC I SDCCH TCH) • 4057 (BSC I SDCCH TCH)



Network element: Nokia BSS Start: BSS11 End: open, valid in S11.5 also.

Daily value:

100 * sum (NBH_TCH_Drops) / sum ( NBH_Hourly_Succesfull_Call_Setup_until_MS_is_on_TCH) Where NBH_TCH_Drops = DROP_AFTER_TCH_ASSIGN = counter_1202 from OSS database table P_NBSC_TRAFFIC that holds ‘Traffic Measurement’ statistics. NBH is Network Busy Hour sum = sum over all cells And NBH_Succesfull_Call_Setup_until_MS_is_on_TCH = A+B+C+D where A = P_NBSC_TRAFFIC.MS_TCH_SUCC_SEIZ_ASSIGN_CMPLT

= TCH Assignment Complete in normal call setup = counter_1148

B = P_NBSC_HO.CELL_SDCCH_TCH

= succesfull intracell directed retry between IOU subcells C = P_NBSC_HO.BSC_I_SDCCH_TCH

= succesfull incoming intra bsc directed retry D = P_NBSC_HO.MSC_I_SDCCH_TCH

= succesfull incoming inter bsc directed retry Where A,B,C,D are taken from the Network Busy Hour. Where P_NBSC_TRAFFIC is OSS database table for ‘Traffic Measurement’ and P_NBSC_HO is OSS database table for ‘Handover Measurement’. Note: The value is pessimistic if succesfull FACCH call setup due to SDCCH congestion has been used

for normal calls. None of counter A,B,C,D is updated in this case. Missing counter ?! And the daily values are averaged over normal working days in a month (MONDAY – FRIDAY) excluding possible public holidays.




Network element: Motorola BSS Start: GSR7 End: Open

Daily value: NBH_DCR = 100 * sum (NBH_TCH_DROPS) / sum (NBH_SUCC_CALL_SETUP_UNTIL_MS_IS_ON_TCH) Where NBH_TCH_Drops = RF_LOSS_TCH_ROLL + INTRA_CELL_HO_LOS + O_INTRA_BS_HO_LOS + O_INTER_BS_HO_FAIL + O_INTER_BS_EQ_FA and NBH_SUCC_CALL_SETUP_UNTIL_MS_IS_ON_TCH = TOTAL_CALLS + // tch assignment complete in normal call setup ASSGN_REDIRECT // succesfull outgoing Directed Retry from OMCR pm database table ‘cell_statistics’ And the counters are taken from Network Busy Hour. sum = sum over all cells. And the daily values are averaged over normal working days in a month (MONDAY – FRIDAY) excluding possible public holidays.





Network element: Alcatel BSS Start: B8 End: Open

Daily value: NBH_DCR = 100 * sum (NBH_TCH_DROPS) / sum (NBH_SUCC_CALL_SETUP_UNTIL_MS_IS_ON_TCH) Where NBH_TCH_Drops = NB_TCH_DROP_EST_PHAS_RLF+NB_TCH_DROP_OUT_HO_EXEC+NB_TCH_DROP_EST_PHAS_BSS_PB+TCH_DRP_EST_PHS_RM_TRAFNS_FAIL and NBH_SUCC_CALL_SETUP_UNTIL_MS_IS_ON_TCH = NB_TCH_NOR_ASS_SUCC+NB_OUT_IDR_SUCC+NB_OUT_EDR_SUCC from OMCR pm database table ‘cell_statistics’ And the counters are taken from Network Busy Hour. sum = sum over all cells. And the daily values are averaged over normal working days in a month (MONDAY – FRIDAY) excluding possible public holidays.


KPI307 Busy Hour Dropped Call Rate v4.0

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