KPI Counters Cause Description

Key Performance Key Performance IndicatorsIndicators

Counters & FormulasCounters & Formulas

Existing Key Performance IndicatorsExisting Key Performance Indicators

Existing FormulaExisting Formula

Erlang Minute sum(ave_busy_tch/res_av_denom14)*60EMD = ---------------------------------------------- = -------------------------------------------------------------------------------------------------------------------

All Drops – Call Re-establishment sum(tch_radio_fail+tch_rf_old_ho+tch_abis_fail_call+tch_abis_fail_old+tch_a_if_fail_call+tch_a_if_fail_old+tch_tr_fail+tch_tr_fail_old+tch_lapd_fail+tch_bts_fail+tch_user_act+tch_bcsu_reset+tch_netw_act+tch_act_fail_call) –sum(tch_re_est_assign)

Erlang Minute per Drop (EMD)

CounterCounter Triggering PointTriggering Point DescriptionDescription

Ave_busy_tch When a TCH seized or released. Sampled every 20 seconds.

Average number of the busy TCHs. The average value is calculated by dividing the value of this counter by the value of the next counter.

Res_av_denom14 Along with above counter Denominator of the average number of busy TCHs (always>0)

Tch_radio_fail Timer 3107 expires while waiting for assignment complete

Number of TCH transactions ended due to a radio failure (Radio Link Timeout). This is effected by low coverage, poor quality, high interference over Air interface

Tch_rf_old_ho Unsuccessful handover, timer 3107 expires

Number of TCH transactions ended due to a radio failure on the source channel during a handover attempt.

Tch_abis_fail_call Unsuccessful TCH activation, timer expires while waiting for Channel Activation Ack message. TCH assignment failure. TRX or TSL blocked due to different causes (not real blocking)

Number of TCH transactions ended due to a failure in the Abis interface during a call in progress. When a TCH transaction ends due to signalling problems in the Abis interface. The signalling problems may include missing acknowledgement of channel activation, missing indication of call establishment, receipt of an error indication, corrupted messages, missing measurement results from the BTS, excessive timing advance or some internal reasons. These failures can also contains situations when the timer T3109 expires in a BSC in call release phase while waiting for the Release Indication. The MS subscriber does not see these failures caused by the T3109 expiry as real drop calls. Blocking caused due to Hardware failure, Site blocked by user, LAPD failure. Counters LAPD_failure, BTS_failure, User_act or Netw_act are updated as well when blocking cause occurs.

Existing Key Performance IndicatorsExisting Key Performance IndicatorsErlang Minute per Drop (EMD)

CounterCounter Triggering PointTriggering Point DescriptionDescription

Tch_abis_fail_old Same as above Number of TCH transactions ended due to a failure in the Abis interface on the source channel during a TCH HO.

Tch_a_if_fail_call TCH assignment failure, MSC sends CLEAR_COMMAND message

Number of TCH transactions ended due to a failure in the A interface during a call in progress. The signalling problems may include CLEAR_COMMAND message from the MSC during the call setup phase before the MSC receives an indication of the completion of the assignment from the MS and the ABNORMAL_CLEAR_ RECEIVED_DUE_TO_A_ INTERFACE message (reset circuit, SCCP cleared by RLSD).

Tch_a_if_fail_old Same as above Number of TCH transactions ended due to a failure in the A interface on the source channel during a handover attempt. It is this counter in the source cell that is updated. If the target cell lies within the same BSC, also counter 001015 in the target cell is updated along with this counter.

Tch_tr_fail Connection Failure message with cause transcoder failure during a call

When a TCH transaction ends due to a transcoder failure during a call attempt and the RRM releases the TCH. These failures can also contains situations when the timer T3109 expires in a BSC in call release phase while waiting for the Release Indication. The MS subscriber does not see these failures caused by the T3109 expiry as real drop calls.

Tch_tr_fail_old Same as above When a TCH transaction ends due to a transcoder failure on the source channel during a handover attempt and the RRM releases the TCH. This happens before the RRM receives a message from the MS stating that the HO or assignment is completed.

Tch_lapd_fail TRX or TSL blocked due to different causes (not real blocking)

Number of TCH transactions that are ended due to an LAPD failure. (The TRX blocked is in one of these sub-states: signalling link fault or PCM fault.). This also cause Handover failure.

Tch_bts_fail TRX or TSL blocked due to different causes (not real blocking)

Number of TCH transactions that are ended due to a BTS failure. (The TRX blocked is in one of these sub-states: FU fault, CU fault, BTS reset, BCF reset, both CU and FU fault, BCF fault.)

Tch_user_act TRX or TSL blocked due to different causes (not real blocking)

Number of TCH transactions that are ended due to user actions. (The TRX/TSL is in sub-state blocked by the user.)

Tch_bcsu_reset TRX or TSL blocked due to different causes (not real blocking)

Number of TCH transactions that are ended due to a BCSU restart.

Tch_netw_act TRX or TSL blocked due to different causes (not real blocking)

Number of TCH transactions ended due to a reconfiguration of the radio network. (The TRX blocked is in sub-state blocked by the system.)

Tch_act_fail_call Unsuccessful TCH activation Number of TCH transactions that are ended due to a failure to activate a channel during a call attempt.

Signalling ChartsSignalling Charts

Basic call Basic call

Siganlling Chart with Triggering PointsSiganlling Chart with Triggering PointsTCH Radio FailTCH Radio Fail TCH Rf Old HOTCH Rf Old HO

Signalling Chart with Triggering PointsSignalling Chart with Triggering PointsTCH Abis Fail CallTCH Abis Fail Call TCH Abis Fail Call/ TCH LAPD FailTCH Abis Fail Call/ TCH LAPD Fail

TCH A_if Fail CallTCH A_if Fail Call TCH A_if Fail OldTCH A_if Fail Old

Signalling Chart with Triggering PointsSignalling Chart with Triggering Points

DROP CALL RATIOS

TCH SEIZURES FOR NEW CALLtch_norm_seiz /c1009+tch_seiz_due_sdcch_con /c1099 (S5)+msc_i_sdcch_tch /c4044 +bsc_i_sdcch_tch /c4057+cell_sdcch_tch /c4074-tch_succ_seiz_for_dir_acc /c1165 (S7)

-tch_re_est_assign /c57032 (S7)

TCH DROPS AFTER SEIZURETCH_RADIO_FAIL /c1013+TCH_RF_OLD_HO /c1014+TCH_ABIS_FAIL_CALL /c1084+TCH_ABIS_FAIL_OLD /c1085+TCH_A_IF_FAIL_CALL /c1087+TCH_A_IF_FAIL_OLD /c1088+TCH_TR_FAIL /c1029+TCH_TR_FAIL_OLD /c1030+TCH_LAPD_FAIL /c1046+TCH_BTS_FAIL /c1047+TCH_USER_ACT /c1048+TCH_BCSU_RESET /c1049+TCH_NETW_ACT /c1050+TCH_ACT_FAIL_CALL /c1081

-tch_re_est_assign /c57032 (S7)DROPS

CALLS

100 * %

STARTED CONVERSATIONSconver_started /c57015- msc_i_tch_tch /c4043

CONVERSATION DROPSdropped_calls /c57007

TCH DROPS AFTER ASSIGNMENT

tch_new_call_assign /c57033+tch_ho_assign /c57034

-tch_norm_release /c57035-tch_ho_release /c57036

-tch_re_est_assign /c57032

TCH ASSIGNMENTS FOR NEW CALLtch_new_call_assign /c57033

TCH RELEASEDisconnect from MS

RF CHN RELEASERf_channel_release_ack from BTS

CONVERSATION STARTED conn_ack to BTS

TCH ASSIGNED (alert followed) Assignment_complete from BTS

TCH SEIZED BSC allocates a TCH as a response toTCH request (Channel Activation)

Dcr_8b Dcr_5a

Dcr_3j

Note: There will be a new counter c1202 for drops after TCH assign in S11 (first c1112 redefined in S9 CN then a spare counter 57044 used in S10.5)

Dropped call trace window

Drop call statistics per day in each BSC BSC : XYZ_BSC_3

Bids ***** Rf Abis Tr Aif (%) (%) NC (%) (%) (%) (%) ***** ***** DCR(%) DR ***** ***** ***** ***** Lapd User ****** CR call call call call BTS Cnfg dcr_3cMMDD FCS old old old old BCSU Act dcr_3f---- -------- ----- ----- ----- ----- ----- ----- ------0829 208215 1.3 0.3 0.1 0.0 0.1 0.0 2.2 695 0.3 0.0 0.0 0.2 0.0 0.0 1.8 781 0.0 0.0 64

TCH drop call ratio, area levelProposed Area / Network levelProposed Area / Network level

162 All BSCs

Avg HO TCH TCH TCH call AG fail drop drop Call Traf Usage lgth block ratio ratio ratio bids (Erl) (%) (s) (%) (%) (%) (%)Day MMDD trf_6 trf_1 trf_3 trf_2a blck_13 hfr_2 dcr_3c dcr_3d--- ---- ------- ------ ------- ------ ------- ------- ------- -------mon 0203 32609 586 4.42 65 0.009 4.5 3.10 2.58sun 0202 17636 306 2.33 62 0.036 5.4 2.91 2.36sat 0201 24863 404 3.34 58 0.043 3.5 2.90 2.42

200

TCH failures==============TCH drop call ratio (before re-establisment).../dcr_3c 2.99 %. TCH_RADIO_FAIL................................/c1003 1523 ( 2.03 %). TCH_ABIS_FAIL_CALL............................/c1075 148 ( 0.20 %). TCH_A_IF_FAIL_CALL............................/c1078 36 ( 0.05 %). TCH_TR_FAIL.................................../c1029 9 ( 0.01 %). TCH_USER_ACT................................../c1037 1 ( 0.00 %). TCH_BCSU_RESET................................/c1038 0 ( 0.00 %). TCH_NETW_ACT................................../c1039 0 ( 0.00 %). TCH_ACT_FAIL_CALL............................./c1081 0 ( 0.00 %). TCH_BTS_FAIL................................../c1036 12 ( 0.02 %). TCH_LAPD_FAIL................................./c1035 1 ( 0.00 %). TCH_RF_OLD_HO.......(HO drop)................./c1004 301 ( 0.40 %). TCH_ABIS_FAIL_OLD...(HO drop)................./c1076 0 ( 0.00 %). TCH_A_IF_FAIL_OLD...(HO drop)................./c1079 218 ( 0.29 %). TCH_TR_FAIL_OLD.....(HO drop)................./c1030 0 ( 0.00 %)

204BSC level

Difference = Improvement by call re-establishment

DOCUMENTTYPE 1 (1)

TypeUnitOrDepartmentHereTypeYourNameHere TypeDateHere

TCH DROPPED CALLS=================

Dropped call rate (dcr_3j)..............................: 5.12 %

800

Proposed Formula Proposed Formula (dcr_3j)(dcr_3j)sum(tch_radio_fail+tch_rf_old_ho+tch_abis_fail_call+tch_abis_fail_old+

tch_a_if_fail_call+tch_a_if_fail_old+tch_tr_fail+tch_tr_fail_old+tch_lapd_fail+

tch_bts_fail+tch_user_act+tch_bcsu_reset+tch_netw_act+tch_act_fail_call)- All Drops – Call Re-establishment sum(tch_re_est_assign)

TCH Drop Call Rate = ---------------------------------------------- = ------------------------------------------------------------------------------------------------------------------- TCH Normal seizures+DR calls- sum(tch_norm_seiz)+sum(msc_i_sdcch_tch+bsc_i_sdcch_tch+cell_sdcch_tch)-

Direct Access(only IUO) + Call started as sum(succ_tch_seiz_for_dir_acc) + sum(tch_seiz_due_sdcch_con)- FACCH Call setup - Call Re-establishment sum(tch_re_est_assign)

Proposed as replacement for EMD

TCH DROP CALL RATIO ......................./dcr_3a 17.78 % 10.00 %

. Drop call ratio components:

. TCH_RADIO_FAIL......../c1013 15.56 % 10.00 %

. TCH_ABIS_FAIL_CALL..../c1084 0.00 % 0.00 %

. TCH_A_IF_FAIL_CALL..../c1087 0.00 % 0.00 %

. TCH_TR_FAIL.........../c1029 0.00 % 0.00 %

. TCH_LAPD_FAIL........./c1046 0.00 % 0.00 %

. TCH_BTS_FAIL........../c1047 0.00 % 0.00 %

. TCH_USER_ACT........../c1048 0.00 % 0.00 %

. TCH_BCSU_RESET......../c1049 0.00 % 0.00 %

. TCH_NETW_ACT........../c1050 0.00 % 0.00 %

. TCH_ACT_FAIL_CALL...../c1081 0.00 % 0.00 %

. TCH_RF_OLD_HO........./c1014 0.00 % 0.00 %

. TCH_ABIS_FAIL_OLD...../c1085 0.00 % 0.00 %

. TCH_A_IF_FAIL_OLD...../c1088 2.22 % 0.00 %

. TCH_TR_FAIL_OLD......./c1030 0.00 % 0.00 %

************************************************************************Dropout ratio (%) (dcr_4b)BSC_XXXXX bts:23 XTAWW bcf:214************************************************************************

Hints:For BTS level hit list run rpp163mx

wed thu fri sat sun mon tue wed thu fri sat 22 23 24 25 26 27 28 29 30 31 01Hr JAN JAN JAN JAN JAN JAN JAN JAN JAN JAN FEB-- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----08 2509 0 33 0 0 010 0 0 14 1311 0 6712 0 0 10 013 0 0 0 914 0 25 0 1315 29 25 20 33 016 017 0 0 2018 0 33 18 0 1719 50 0 38 7 4020 14 50 2521 0 13 0 5022 0

TCH Dropout ratio (dcr_4c) per cell between 19970829 and 19970829

Bids **** Rf Tr Abis Aif (%) (%) Call (%) (%) (%) (%) **** **** DropBTS DR in **** **** **** **** Lapd User Ratio BCF FCS call call call call BTS Cnfg (%) BSC (BTSid) T-T HO old old old old BCSU Act dcr_4c----------------- ------ ---- ---- ---- ---- ----- ----- ------IMAG3 197 0 0 0 0 0.0 0.0 2.3 303 0 2 0 0 0 0.0 0.0 XYZ_BSC_2 (45) 0 0.0 0.0 62

NB1G1 6310 2 0 0 0 0.0 0.0 2.7 066 3 1 0 0 0 0.0 0.0 XYZ_BSC_2 (34) 0 0.0 0.0 4740

TCH drop call ratio, BTS level

BTS hit list level

163

216

TCH observations Statistics

Cause BTS TRX TSL Cause OUTBSC/BCF/BTS nbr nbr nbr Phase OUT OUT count--------------- ---- ---- ---- ------------------------- ------ -------BSC1 17 9 3 Basic assignment 321 9Site ASector 2

Basic assignment 352 223 Internal HO inter, SDCCH 323 44 or TCH target

Internal HO inter, SDCCH 511 2 or TCH target

Internl HO intra, SDCCH o 323 12 r TCH target

Internl HO intra, SDCCH o 511 1 r TCH target

217

TCH Observation

Which BTSs have problems?

What causes?

BTS level

How the suspected BTS has performed?

Drop call trace225

Proposed FormulaProposed Formula (dcr_4c)(dcr_4c)

sum ( tch_radio_fail + tch_rf_old_ho + tch_abis_fail_call + tch_abis_fail_old + tch_a_if_fail_call + tch_a_if_fail_old +

tch_tr_fail + tch_tr_fail_old + tch_lapd_fail + tch_bts_fail + All TCH Drop tch_user_act + tch_bcsu_reset + tch_netw_act +

tch_act_fail_call )TCH Drop% = 100 * [-----------------------]% = 100* [----------------------------------------------------------------------------------------------------------------------------------------------]%

TCH Seizure sum (tch_norm_seiz + msc_i_sdcch_tch + bsc_i_sdcch_tch + cell_sdcch_tch + tch_seiz_due_sdcch_con + msc_i_tch_tch + bsc_i_tch_tch)

Proposed as replacement for EMD


Handover Success Rate (HOSR), Area/ Network Level


Successful Outgoing HO sum(msc_o_succ_ho+bsc_o_succ_ho+cell_succ_ho)HOSR = 100 *[---------------------------------------------]% = 100*[-----------------------------------------------------------------------------------------]%

All outgoing HO attempts sum(msc_o_tch_tch_at+msc_o_sdcch_tch_at+msc_o_sdcch_at+ bsc_o_tch_tch_at+bsc_o_sdcch_tch_at+bsc_o_sdcch_at+

cell_tch_tch_at+cell_sdcch_tch_at+cell_sdcch_at)

Existing Formula Existing Formula

Successful HOsum(msc_o_succ_ho+msc_i_succ_ho+bsc_o_succ_ho+bsc_i_succ_ho+cell_succ_ho)

HOSR = 100 *[ -----------------------]% = 100*[------- -------------------------------------------------------------------------------------------------------------------]% HO attempts sum(msc_o_tch_tch_at+msc_o_sdcch_tch_at+msc_o_sdcch_at+

msc_i_tch_tch_at+msc_i_sdcch_tch_at+msc_i_sdcch_at+ bsc_o_tch_tch_at+bsc_o_sdcch_tch_at+bsc_o_sdcch_at+ bsc_i_tch_tch_at+bsc_i_sdcch_tch_at+bsc_i_sdcch_at+ cell_tch_tch_at+cell_sdcch_tch_at+cell_sdcch_at)

Handover Success Rate (HOSR), BTS Level

No changes proposed

Handover basics Handover basics Notethat in S10 the counterscell_* mean intra-BTS (Cell in S10 in general meansSegment)

BTSA

BTSB

BTSC

BTSD

= Adjacency

For source cell oneof these is triggeredat an attempt:msc_o_tch_tch_atmsc_o_ sdcch_tch _atmsc_o_sdcch_atbsc_o_tch_tch_atbsc_o_ sdcch_tch _atbsc_o_sdcch_at

Inter-BTS HO

For target cell oneof these is triggeredat success:msc_i_tch_tchmsc_i_ sdcch_tch msc_i_sdcchbsc_i_tch_tchbsc_i_ sdcch_tchbsc_i_sdcch

HO attempt:The BSC receives measurements from the BTS. It processes the measurements and decides on the handover algorithm. If thresholds have been triggered for the handover, the BSC generates a candidate (target) cell list and starts the handover attempt.If candidate list is not generated for some reason then HO is not attempted.

Intra-BTS HO

At an attempt oneof these is triggered:cell_sdcch_atcell_ sdcch_tch _atcell_tch_tch_at

At a success oneof these is triggered:cell_sdcchcell_ sdcch_tchcell_tch_tch

Candidates in S11:Msc_o_ho_cmdBsc_o_ho_cmd_assgnCell_ho_assgn(to make the differencebetween attempt andstarted HO)

bsc_i_drop_callsmsc i_drop_calls

bsc_o_drop_callsmsc o_drop_calls

cell_drop_calls

For source cell one of these is triggered if target cell is congested:Bsc_o_fail_lackMsc_o_fail_lack

For target cell oneof these is triggeredIf target is congested:Bsc_i_fail_lackMsc_i_fail_lack

If target is congested:Cell_fail_lack

HO attempt & congestion:If first cell in the candidate list occurs congested the blocking counter is triggered and the next cell is attempted.

HO successHandover complete message is the triggering point

for the successful handover counters.


TCH Blocking, Area/ Network Level

TCH Blocking, BTS Level

No changes proposed

Existing FormulaExisting Formula All TCH call blocked - sum(tch_call_req-tch_norm_seiz)-sum(msc_o_sdcch_tch+

Directed Retry calls + Direct Access Calls bsc_o_sdcch_tch+cell_sdcch_tch)+ sum(tch_succ_seiz_for_dir_acc) - TCH Call Blocked due to A_if & A_int sum(tch_rej_due_req_ch_a_if_crc –(bsc_I_unscc_a_int_cric_type +

msc_controlled_in_ho+ho_unscc_a_int_cric_type))TCH_Blck = 100 *[--------------------------------------------------------]% = 100*[---------------------------------------------------------------------------------------]%

All TCH Call Request - sum(tch_call_req) - TCH Call Blocked due to A_if & A_int sum(tch_rej_due_req_ch_a_if_crc –

(bsc_I_unscc_a_int_cric_type + msc_controlled_in_ho+ho_unscc_a_int_cric_type))

Existing FormulaExisting Formula All TCH call blocked - sum(tch_call_req-tch_norm_seiz)-sum(msc_o_sdcch_tch+

Directed Retry calls + Direct Access Calls bsc_o_sdcch_tch+cell_sdcch_tch)+ sum(tch_succ_seiz_for_dir_acc) - TCH Call Blocked due to A_if & A_int sum(tch_rej_due_req_ch_a_if_crc –(bsc_I_unscc_a_int_cric_type +

msc_controlled_in_ho+ho_unscc_a_int_cric_type))TCH_Blck = 100 *[--------------------------------------------------------]% = 100*[---------------------------------------------------------------------------------------]%

All TCH Call Request - sum(tch_call_req) - TCH Call Blocked due to A_if & A_int sum(tch_rej_due_req_ch_a_if_crc –

(bsc_I_unscc_a_int_cric_type + msc_controlled_in_ho+ho_unscc_a_int_cric_type))


SDCCH Success Rate, Area/ Network Level

SDCCH Success Rate, Cell Level

Existing formula indicates Call Setup Success Rate for voice calls, not indicates success of all SDCCH requirements

Existing FormulaExisting Formula Successful TCH seizures-

Call Re-establishment sum(tch_norm_seiz)-sum(tch_re_est_assign)SDSR = 100 *[-------------------------------------------]% = 100*[-----------------------------------------------------------------------------------------------------]%

SDCCH seizures for new calls - sum(succ_seiz_term+succ_seiz_orig+sdcch_emerg_call+sdcch_call_re_est) -

blocked calls sum(succ_sdcch_sms_est+unscc_sdcch_sms_est) - bsc_o_sdcch_tch -

msc_o_sdcch_tch-cell_sdcch_tch+succ_tch_seiz_for_dir_acc) – sum(succ_seiz_supplm_serv)-call clears before TCH + net impact of SDCCH-SDCCH ho on area + net incoming DR to area


Successful TCH seizures sum(tch_norm_seiz)SDSR = 100 *[-------------------------------------------]% = 100*[-----------------------------------------------------------------------------------------------------]%

SDCCH seizures for new calls - sum(succ_seiz_term+succ_seiz_orig+sdcch_emerg_call+sdcch_call_re_est) -

blocked calls sum(succ_sdcch_sms_est+unscc_sdcch_sms_est) - bsc_o_sdcch_tch -

msc_o_sdcch_tch-cell_sdcch_tch+succ_tch_seiz_for_dir_acc) – sum(succ_seiz_supplm_serv)-call clears before TCH


SDCCH Success Rate, Area/ Network & Cell Level

Proposed Formula Proposed Formula

sdcch_assign-(succ_seiz_term+succ_seiz_orig+sdcch_loc_upd+

SDCCH assignment succ_emerg_call+sdcch_call_re_est+imsi_detach_sdcch+ not successful succ_seiz_supplem_serv)

SD = 100 * ---------------------------------- = 100 * -------------------------------------------------------------------------------------------

total SDCCH sdcch_assign assignment requests

Existing formula indicates Call Setup Success Rate for voice calls, not indicates success of all SDCCH requirements

SDCCH requests (S10)SDCCH requests (S10)

SDCCH REQUESTS/c1000

sdcch_seiz_att

IMM.ASSIGNMENTS FOR CALLS,LU,SS, IMSI DETACH/c1007sdcch_assign

BLOCKED/blck_15

sdcch_busy_att - tch_seiz_due_sdcch_con

RACH on CCCH/c3004

ch_req_msg_rec

REJECTED DUE TO ILLEGAL EST.CAUSE (3/8 of ghosts in ph.1´)/c3030ghost_ccch_res

5/8 OF GHOSTS (ph.1) AND OTHER FAILURES BEFORE ESTABL. IND.:/SD_1ac1007- TRF_25a

/c3013 succ_seiz_orig

/c3012 succ_seiz_term

CALL RE-EST./c3020sdcch_call_re_est

LOCATION UPDATE/c3019sdcch_loc_upd

EMERGENCY CALL/c3021sdcch_emerg_call

SDCCH ACCESSES REJECTED IN BSC

TRUE SDCCH SEIZURES/TRF_25a (not updated in SDCCH HO)

SEIZURES FOR HO/c1006

sdcch_ho_seiz

SDCCH FAILURES/c1075sdcch_abis_fail_call (blocked chan.,corrupted

msgs, failed chan.act.)

TRUE SDCCH SEIZURES FOR CALL,SMS, SS/TRF-27

IMSI DETACH /c3033 (S7)imsi_detach_sdcch

TRUE SDCCH SEIZURES FOR CALL /TRF-91TRF-27- succ_sdcch_sms_est-unsucc _sdcch_sms_est-succ_seiz_supplem_serv

TRUE SDCCH SEIZURES FOR SMSSms_5

succ_sdcch_sms_est+ unsucc_sdcch_sms_est

SDCCH BLOCKING (blck_5a)

SDCCH-SDCCH HO

other than sdcch_abis_* failures

small part of failures

Normal LU

Periodic LU

IMSI attach

MS accessing, noise (ghosts)

NOTE:Triggered also in case ofHO attempt if there are nofree SDCCH

SDCCH-SDCCHHO

TCH

FACCH call setups/c1099

tch_seiz_due_sdcch_con

Distance checking BSS5280 (S5)

REJECTED DUE TO DISTANCE/c3031 (S5)rej_seiz_att_due_dist

SDCCH FAILURES/c57020 (S7)t3101_expired

(Ghosts)

CALL RE-EST. ASSGN./c57022 (S7)sdcch_re_est_assign

SUPPLEMENTARY SERVICE REQUEST /c3044 (S9) succ_seiz_supplem_serv

T3101 adjustable by MMLZEGT:T3101..

BCSU Lower Limit = 34 unhandled reqs/c3039 (S7)bcsu_overload_lower_limit

BCSU Upper Limit =53 unhandled reqs/c3040 (S7)bcsu_overload_upper_limit

Limit per CCCH =20 req.per BTS (CCCH)/c3041 (S7)bcsu_overload_deleted_rach

Call_assign_after_sms /c3059 ( S10.5)

ND report 134

MOC SMS LS SS

MTC SMS

LOCATION SERVICESS??

Call Success Factors Call Success Factors

SDCCH success ratio

SDCCH accessprobability

TCH accessprobability

TCH successratio

Improvementby FACCH call setup

Improvementby Call Re-establishment

Improvementby Directed Retry,Queuing

Call success ratio

Improvementby Dynamic SDCCH Allocation (S7)

Call setup

Call completion/ retain ability

Call drops Call drops Blocking Blocking

Documents

KPI Counters Cause Description