bss formula
TRANSCRIPT
-
8/13/2019 BSS Formula
1/61
-
8/13/2019 BSS Formula
2/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 2
BSS PM DOCUMENTREFERENCES
Author: J.Neva 8/97
Version: 0.3 18.8.98
Trigger point pictures included for:
S6:traffic, res.access, service (3)
S7:HO, HO adj.cell, IUO
NMS2000 Database Descriptions for BSS
measurements (2)
Training documents
Customer documents
BSS Network Doctor Formulas Reference Guide
TAN 0936 (1)
Working documents, Nokia internal,
PMWG , delivery along Cell Doctor (1)
Using GSM/DCS Performance Measurements, T9BSC
NMS
Study of BSS counter formulas of Nokia database
f_bss_NN.doc
Pictures on BSS PM counters and formulas
f_bss_NN.ppt
(1) http://wwwalltr.ntc.nokia.com/CSTRE/NOS/SE/stateng.htm
(2) http://wwwtre.tele.nokia.fi/NMS/ryhmat/tecdo/nmslib/index.html
(3) http://wwwalltr.ntc.nokia.com/BSC/ORG/BSCTRE/DMSME/document.htm, link from (1)
Basic Operating Principles and Procedures ,T10Supplementeary references (counter
descriptions)
-
8/13/2019 BSS Formula
3/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 3
KEY PERFORMANCEINDICATORS (KPI)
OPERATORS
USER
GROUPS
MANAGEMENT
Author: J.Neva 11/96
Version: 1.0
MARKETING
PLANNING
O&M
CUSTOMER CARE
PI=Performance Indicator
(counter, formulae,figure from MML output)
PI
zz
KPI
a
PI
a
PI b
PI c
KPI
b
KPI
xx
.
.
.
.
..
PIKPIREPORTS
DISTRIBUTION
GENERATION
WORK PROCESS
KNOW - HOWTOOLS
KNOW - HOW
FORMULAE
KNOW - HOW
Users finally decide what are
KPI when they define the contents
of the report
STATISTICS ENGINEERING SERVICE OF NOKIA CUSTOMER SERVICES
.
.
.
.
.
.
-
8/13/2019 BSS Formula
4/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 4
Availability
Author: J.Neva 10/98
Version: 1.0
PMWG approval.:2.12.98
TCH availability %, S4 (ava_1a)
sum(ave_avail_full_TCH/res_av_denom2)100 * ------------------------------------------------------------ %
sum(ave_avail_full_TCH/res_av_denom2)+sum(ave_non_avail_TCH)
(p_nbsc_res_avail table)
Known problems:
If TRXs are locked and BTSs and BCFs are unlocked, the TCHs appear as unavailable.
=> technical / operational unavailability can not be separatedThis PI is does not take into consideration Half RateTCH.
SDCCH availability %, S4 (ava_4)
sum(ave_sdcch_sub/res_av_denom3)100 * --------------------------------------------------------- %
sum(ave_sdcch_sub/res_av_denom3)+sum(ave_non_avail_sdcch)
(p_nbsc_res_avail)
Known problems: Affected by locked TRX under unlocked BCF and BTS.
Non avail.
Avail.
Information available on BTS level.
Note:Downitme of BTS can be counted from 'BCCH missing' alarms (2567, in S7 the number will chaged to 7767!
Note:In S8 the Metrosite requires
the diagnostics to be run before
availability counters are valid.
-
8/13/2019 BSS Formula
5/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 5
SDCCH requests
SDCCH
REQUESTS
/c1000
sdcch_seiz_att
ASSIGNMENTS
FOR CALLS,LU,SS
/c1007
sdcch_assign
BLOCKED
/blck_15
sdcch_busy_att -
tch_seiz_due_sdcch_con
RACH on CCCH
/c3004
ch_req_msg_rec REJECTED DUE
TO ILLEGALEST.CAUSE
/c3030
ghost_ccch_res
5/8 OF GHOSTS (ph.1) AND
OTHER FAILURES
BEFORE ESTABL.
INDICATION
(incl.IMSI detach):
/SD_1
c1007- TRF_25
MOC (incl.SMS)
/c3013
succ_seiz_orig
MTC (incl.SMS)
/c3012
succ_seiz_term
CALL RE-EST.
/c3020
sdcch_call_re_est
LOCATION UPDATE
/c3019
sdcch_loc_upd
EMERGENCY CALL
/c3021
sdcch_emerg_call
SDCCH ACCESSES REJECTED IN BSC
TRUE SDCCH SEIZURES
/TRF_25 (not updated in SDCCH HO)
SEIZURES FOR HO
/c1006
sdcch_ho_seiz
SDCCH FAILURES
/c1075
sdcch_abis_fail_call (blocked chan.,corrupted
msgs, failed chan.act.)
Author: J.Neva 5/96
Version: 1.9 11.2.98
PMWG approval.: v 1.9 11.2.98
TRUE SDCCH SEIZURES FOR CALL,SMS,SS
/TRF-27
IMSI DETACH SDCCH
(S7)
/c3033
TRUE SDCCH SEIZURES
FOR CALL & SS
/TRF-28
TRF-27
- succ_sdcch_sms_est
- unsucc _sdcch_sms_est
TRUE SDCCH SEIZURES
FOR SMS
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 of
HO attempt if there are no
free SDCCH
SDCCH-
SDCCH
HO
TCH
FACCH call setups
/c1099
tch_seiz_due_sdcc
h_con
Distance verifying
(S5)
3/8 of ghosts (ph.1)
REJECTED DUE TO
DISTANCE (S5)
/c3031
rej_seiz_att_due_dist
SDCCH FAILURES
/c57020 (S7)
sdcch_t3101_expired
(Ghosts)
-
8/13/2019 BSS Formula
6/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 6
FACCH call setup (S5)
RACH on CCCH
/c3004
ch_req_msg_rec
MOC
/c3024
tch_moc
MTC
/c3023
tch_mtc
CALL RE-EST.
/c3025
tch_call_re_est
EMERGENCY CALL
/c3022
tch_emerg_call
TCH FAILURES
/c1084
tch_abis_fail_call
Author: J.Neva 1/97
Version: 0.4 9.12.97
PMWG review.: 0.4 9.12.97
TCH SEIZURES FOR FACCH CALL SETUP
MS accessing,
noise (ghosts)
TCH REQUESTS
/C1010 tch_request
SDCCH REQUESTS
/C1000 sdcch_seiz_att
BLOCKED
/C1001 sdcch_busy_att
TCH REQ FOR FCS
/C1043 tch_fast_req
TCH SEIZ ATT DUE TO SDCCH CONGEST
/C1098
tch_seiz_att_due_sdcch_con (S5)
FTCH REQ, FCS
/C1123 tch_full_req_fast_call
TCH REQ, FCS, RATE UNDEF.
/C1124 tch_fast_call_ch_rate_not_det
OR
TCH SUCC REQ FOR FCS
/C1044 tch_fast_seiz
TCH SUCC SEIZ ATT DUE TO SDCCHCONGEST
/C1099 tch_seiz_due_sdcch_con (S5)
FTCH SUCC SEIZ FOR FCS
/C1125 tch_succ_full_seiz_fast_call
HTCH SUCC SEIZ . FOR FCS,
RATE UNDEF.
/C1126 tch_succ_half_seiz_fast_call
OR
REJECTED DUE TO
DISTANCE (S5)
/c3031
rej_seiz_att_due_dist
REJECTED DUE
TO ILLEGAL
EST.CAUSE/c3030
ghost_ccch_res
5/8 OF GHOSTS (ph.1) AND
OTHER FAILURES
BEFORE ESTABL.
INDICATION(incl.IMSI detach):
/SD_1
c1007- TRF_25
SDCCH ACCESSES REJECTED IN BSC
3/8 of ghosts
(ph.1)
IMSI DETACH TCH
/c3034
(coming in S7)
-
8/13/2019 BSS Formula
7/61NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 7
TCH requests, call (S6)
TCH REQUESTS
/C1010
tch_request
TCHREQUESTS
FOR NEW
CALL
/trf_18a
tch_call_req
- trf_49
TCH SEIZURES FORNEW CALL
/c1009
tch_norm_seiz
DR OUT SUCC
/dr_3
msc_o_sdcch_tch+bsc_o_sdcch_tch
BLOCKED CALLS
/blck_9b
tch_call_req-trf_49-tch_norm_seiz -dr_3-dr_5TCHREQUESTS
FOR HO
/ho_14b
tch_request
-tch_call_req
-tch_fast_req
-trf_50
TCH CALL BLOCKING (blck_8c)
= 100*blck_9b/(c1026-trf_49) %
TCH
REQUESTS
FOR
FCS
/c1043
tch_fast_req
Author: J.Neva 5/96
Version: 1.9 12.1.1999
PMWG approval.: 12.1.1999
DR intra SUCC (IUO opt.feature)
/dr_5
cell_sdcch_tch
TO QUEUE
/c1016
tch_qd_call_att
UNSERVED QUEUED CALL REQ (timer expiry or higher priority queuer)
/c1024
unsrv_qd_call_att
FROM Q TO DR /XX1 1173(S8)
MS MOVED TO TCH
/c1148 (S7)
xxxx
NOTE: If Trunk Reservation is
used then HO and Call blocking
can not be counted precisely
(there is only one counter for
Trunk Res. Invocation Refused
case)
CALL RETRIES DUE TO AIF POOL MISMATCH
/ trf_49
tch_rej_due_req_ch_a_if_crc
- (bsc_i_unsucc_a_int_circ_type+msc_controlled_in_ho+ho_unsucc_a_int_circ_type)
-
8/13/2019 BSS Formula
8/61
-
8/13/2019 BSS Formula
9/61NOKIA Customer Services / NOS / Statistics Engineering / J.Neva / F_BSS_15.PPT / 10-Dec-98 / page: 9
Queueing 1/: example 1TRX,combined CCH, DR active
Signalling on SDCCH
In Queue on SDCCH of this cell
On TCH, or accessing TCH
Maximum Length Of Queue
MQL = Max Queue Length
parameter, ZEQH
DEF 50%, for 1 TRX
=> 4 places in queue
DR
In Queue for HO, the MS Is on TCH of another cell
Order in the queue:
- by default, HO candidates served
first (QPC > QPH, QPC > QPN,
smaller priority served first,
parameters ZEQH)
- between HO and Call candidates,
mobiles are ordered by mobile
priority, if no difference in priority,
first come first served
No free SDCCH, counter 1001 sdcch_busy_att
updated (had there been free TCH's, FACCH
call setup or dynamic SDCCH allocation could
have been attempted)
1
2
4
3
4
4 4 4 4 4 44
2 2 3 3
Author: M.Rsnen 6/98
Version: 1.0
PMWG approval.:18.9.98
Callqueuingon SDCCH
On TCH
MS
4 logical places in queue
Callqueuingon SDCCH
HOqueuing
HOqueuing
MS MS MS MS MS MS
MSMS
4 SDCCH slots
MS
MS
In this example the TCHs are
all seized,queue is full (2 calls.
2 Hos) and SDCCH is full.
Accordingly all new call attemptsget rejected on SDCCH because
SDCCH is full.
MS
MS
7 TCH
NOTE: SDCCH resources
are used by queuing
Time limit handover (TLH)
DEF 5 seconds (max: 10sec)
MS
MS
-
8/13/2019 BSS Formula
10/61NOKIA Customer Services / NOS / Statistics Engineering / J.Neva / F_BSS_15.PPT / 10-Dec-98 / page: 10
Queueing 2/2: timers and countersexample: queueing and DR activated,(direct access IUO,S7 not included)
Min time limit
directed retry
(MIDR)
DEF 0 secondsExpiry -> MS removed from the queue
Expiry -> MS removed from the queue
If TLC < MADR, and TLC expires, MS is removedfrom call queue but DR may still happen
1010 tch_request
1016 tch_qd_call_att
1010 tch_request
1008 tch_ho_seiz
1026 tch_call_req
Successful DR, targetSuccessful DR, source
DR
Time limit call (TLC)
DEF 10 seconds (max: 15sec)
Max time limitdirected retry
(MADR)
DEF 5 seconds
1056 que_all_ass_req
1173 rem_from_queue_due_dr
(S8 new counter ):
MS removed from queue because
of DR
1020 ave_que_time_call_att
/ 1021 queue_denom2
shows the average call setup
queueing time
1060 que_all_ass_req_fail
1011 tch_req_rej_lack
1024 unsrv_qd_call_att
4065 bsc_o_sdcch_tch
4057 bsc_i_sdcch_tch
4050 msc_o_sdcch_tch
4044 msc_i_sdcch_tch
1003 sdcch_radio_fail
1013 tch_radio_fail
1084 tch_abis_fail_call
or
or
Normal
Ass ignment
4053 msc_o_sdcch_tch_at
4068 bsc_o_sdcch_tch_at
DR attempt, source
4060 bsc_i_sdcch_tch_at
4047 msc_i_sdcch_tch_at
DR attempt, target
or
or
1009 tch_norm_seiz
Assignment Attempt
12
4
4
Author: M.Rsnen 6/98
Version: 1.0
PMWG approval.:18.9.98
Signallingon SDCCH
Queuing
on SDCCH
TCH
TCHof othercell
Failed DR, source
X
X
X
X
XCall attempt lost and
MS goes to idle state
1148 xxxxxx (S7)
-
8/13/2019 BSS Formula
11/61NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 11
SDCCH call request and SDCCH HO
SDCCH
REQUESTS
/c1000
sdcch_seiz_
att
SEIZURES FOR
CALLS , LU s AND
IMSI DETACHES
/c1007
sdcch_assign
MOC (incl.SMS)
/c3013
succ_seiz_orig
MTC (incl.SMS)
/c3012
succ_seiz_term
EMERG CALL/c3021
sdcch_emerg_call
SEIZURES FOR HO/c1006
sdcch_ho_seiz
Author: J.Neva 1/97
Version: 1.2 12/97
PMWG appr.: 1.2 11.2.98
SDCCH - SDCCH
INTER CELL HO
TO CELL B
Cell A (source)
Cell B (target)
SDCCHREQUESTS
/c1000
sdcch_seiz_att
one of SDCCH HO attempt
counters triggered
bsc_i_sdcch_at /c4061
or
msc_i_sdcch_at /c4048
one of SDCCH HO successcounters triggered
bsc_i_sdcch /c4058
or
msc_i_sdcch /c4045
TCH
==> SDCCH HO have to be compensated when counting SDCCH success ratio (CSF_2x) for a cell
One of these triggered
CALL RE-EST
/c3020
sdcch_call_re_est
IMSI DETACH (S7)
/c3033
imsi_detach_sdcch
LOC UPDATE/c3019
sdcch_loc_upd
Intra cell SDCCH to SDCCH HO
attempt counter
cell_sdcch_at/c4078
success counter
cell_sdcch/c4075
one of SDCCH HO
attempt counters
triggered
bsc_o_sdcch_at
/c4069 or
msc_o_sdcch_at
/c4054
one of SDCCH HO
success counters
triggered
bsc_o_sdcch /c4066
or
msc_o_sdcch /c4051
Inter cell SDCCH to SDCCH HO
-
8/13/2019 BSS Formula
12/61NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 12
Drop on SDCCH and call re-establishment
SDCCH
REQUESTS
/c1000
sdcch_seiz_att
SEIZURES FOR
CALLS AND LU
/c1007
sdcch_assign
MOC (incl.SMS)
/c3013
succ_seiz_orig
MTC (incl.SMS)
/c3012
succ_seiz_term
EMERGENCY CALL
/c3021
sdcch_emerg_call
Author: J.Neva 1/97
Version: 1.2 11.2.98
PMWG review.: 1.2 11.2.98
Cell A
one of SDCCH fail counters is triggered
SDCCH_RADIO_FAIL /c1003 or
SDCCH_USER_ACT /c1037 or
SDCCH_BCSU_RESET /c1038 or
SDCCH_NETW_ACT /c1039 or
SDCCH_BTS_FAIL /c1036 orSDCCH_LAPD_FAIL /c1035 or
SDCCH_A_IF_FAIL_CALL /c1078 orSDCCH_ABIS_FAIL_CALL /c1075
One of these triggered
Call drops
Call re-establishment executed
SDCCH
REQUESTS/c1000
sdcch_seiz_att
SEIZURES FOR
CALLS AND LU/c1007
sdcch_assign
Cell A
TCH
CALL RE-EST.
/c3020
sdcch_call_re_est
Ghost rach accesses
or double seizures
NOTE ! Call re-establishment can be executed more than once.Is call re-establishment possible only for emergency, moc and mtc ??
-
8/13/2019 BSS Formula
13/61NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 13
Drop on TCH and call re-establishment
SDCCH
REQUESTS
/c1000
sdcch_seiz_att
SEIZURES FOR
CALLS AND LU
/c1007
sdcch_assign
MOC (incl.SMS)
/c3013
succ_seiz_orig
MTC (incl.SMS)
/c3012
succ_seiz_term
EMERGENCY CALL
/c3021
sdcch_emerg_call
Author: J.Neva 1/97
Version: 1.1 12/97
PMWG review.:1.1 11.2.98
Cell A
One of these triggered
Call re-establishment executed
TCH REQUESTS
/c1010
tch_request
TCH
REQUESTS
FOR NEWCALL
/c1026
tch_call_req
TCH SEIZURES FOR
NEW CALL
/c1009
tch_norm_seiz
Call drops
SDCCHREQUESTS
/c1000
sdcch_seiz_att
SEIZURES FOR
CALLS AND LU
/c1007
sdcch_assign
Cell A
TCH REQUESTS
/c1010
tch_request
TCH
REQUESTS
FOR NEWCALL
/c1026
tch_call_req
TCH SEIZURES FOR
NEW CALL/c1009
tch_norm_seiz
CALL RE-EST./c3020
sdcch_call_re_est
one of TCH fail counters is triggered
TCH_RADIO_FAIL /c1013 or
TCH_USER_ACT /c1048 or
TCH_BCSU_RESET /c1049 or
TCH_NETW_ACT /c1050 or
TCH_BTS_FAIL /c1047 or
TCH_LAPD_FAIL /c1046 or
TCH_A_IF_FAIL_CALL /c1087 orTCH_ABIS_FAIL_CALL /c1084 or
TCH_TR_FAIL /c1029 or
TCH_ACT_FAIL_CALL /c1081
NOTE ! Call re-establishment can be executed more than once.Is call re-establishment possible only for emergency, moc and mtc ??
-
8/13/2019 BSS Formula
14/61NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 14
Drop Call ratio problematic
BSC 1
BSC 2
SDCCH
TCH #2
SDCCH
TCH #1
TCH #2
TCH #3
Drop call
and
MSC 2
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_FAILTCH_TR_FAIL_OLD
TCH_LAPD_FAIL
TCH_BTS_FAIL
TCH_BCSU_RESET
TCH_USER_ACT
TCH_NETW_ACT
TCH_ACT_FAIL_CALL
TCH_NORM_SEIZ
CONVER_STARTEDTCH_NORM_SEIZ
CONVER_STARTED
DROPPED_CALL
Silence and then
busy tone after time-out
MS
A
MS
B
SUCC_SEIZ_ORIG
SUCC_SEIZ_TERM
(P_MSC_CC)
CLEAR_CODE_ID/CALLS_IN_SPEECH
One of these triggered
Instead of Drop Call ratio it
is also possible
to talk about Drops per Erlang ratio.
TCH_HO_SEIZ
TCH_HO_SEIZ
TCH_HO_SEIZ
208,609,60E,610,70A,B13,B14,B16,B1B,B1C,D00,D01,D02,D03,D04,D06,D07,D08Eg.clear codes:
Author: J.Neva 9/98
Version: 1.0 20.9.98
PMWG review.: 1.0 12.10.98
MSC 1
41 'Temp. failure'
(P_MSC_CC)
CLEAR_CODE_ID/CALLS_IN_SPEECH
BSC1:
normal clear
B13
-
8/13/2019 BSS Formula
15/61NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 15
TCH request and normal DR
TCH REQUESTS
/c1010
tch_request
TCH
REQUESTS
FOR NEW
CALL
/c1026
tch_call_req
TCH SEIZURES FOR
HO (incl. DR in)
/c1008
tch_ho_seiz
DR OUT SUCC
/DR_3
msc_o_sdcch_tch
/c4050 or
bsc_o_sdcch_tch
/c4065
Author: J.Neva 11/96
Version: 1.2 12/97
PMWG approval.: 1.2 11.2.98
Cell A (source)
TCH REQUESTS
/c1010
tch_request
Cell B (target)
DR IN ATT
/DR_2
msc_i_sdcch_tch_at
/c4047 orbsc_i_sdcch_tch_at
/c4060
DR (SDCCH- TCH HO)TO CELL B
TCH congestion
DR OUT ATT
/DR_1
msc_o_sdcch_tch_at
/c4053 or
bsc_o_sdcch_tch_at
/c4068
DR IN SUCC
/DR_4
msc_i_sdcch_tch
/c4044 orbsc_i_sdcch_tch
/c4057
In case of normal DR
tch_norm_seiz (1009)
counter is not
triggered at all.
If normal DR fails,
sdcch_radio_fail_old
(1004)
is triggered.
In case of normal DR
tch_req_rej_lack (1011)
counter is not
triggered at all.
-
8/13/2019 BSS Formula
16/61NOKIA Customer Services / NOS / Statistics Engineering / J.Neva / F_BSS_15.PPT / 10-Dec-98 / page: 16
TCH REQUESTS
/c1010
tch_request
TCH
REQUESTS
FOR NEW
CALL
/c1026
tch_call_req
TCH SEIZURES FOR
HO (incl. DR in)
/c1008
tch_ho_seiz
Intra DR SUCC
/c4074
cell_sdcch_tch
Author: J.Pekkarinen 10/97
Version: 1.0 24.10.97
PMWG approval.: 1.0 6.11.97
Cell A (source, regular TRX)
TCH REQUESTS
/c1010
tch_request
Cell A (target, super TRX)
DR (SDCCH-TCH HO)
TO SUPER TRX
TCH congestion
TCH request and Intra cell DR
DR ATT
/c4077
cell_sdcch_tch_at
(FEATURE: TCH assignment to super-reuse TRX in IUO, S6)
-
8/13/2019 BSS Formula
17/61NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 17
TCH REQUESTS
/c1010
tch_request
TCH
REQUESTS
FOR NEW
CALL
/c1026
tch_call_req
TCH SEIZURES FOR
HO (incl. DR in)
/c1008
tch_ho_seiz
DR IN SUCC
/c4057
bsc_i_sdcch_tch
Author: J.Pekkarinen 10/97
Version: 1.0 24.10.97
PMWG approval.: 1.0 6.11.97
Cell A (source, regular TRX)
TCH REQUESTS
/c1010
tch_request
Cell B (target, super TRX)
DR (SDCCH-TCH HO)
TO SUPER TRX CELL B
TCH congestion
DR IN ATT
/c4060
bsc_i_sdcch_tch_at
TCH request and Inter cell DR
DR OUT SUCC
/c4065
bsc_o_sdcch_tch
DR OUT ATT
/c4068
bsc_o_sdcch_tch_at
(FEATURE: TCH assignment to super-reuse TRX in IUO, S6)
TCH REQUESTS REJ
DUE LACK/c1011
????????
tch_rej_lack
-
8/13/2019 BSS Formula
18/61NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 18
Intra Dir Acc SUCC
/c4074
cell_sdcch_tch
Author: J.Pekkarinen 10/97
Version: 1.0 24.10.97
PMWG approval.: 1.0 6.11.97
TCH REQUESTS
/c1010
tch_request
Cell A (target, super TRX)
Direct Access Attempt
/c4077
cell_sdcch_tch_at
TCH request and Intra cell direct access(FEATURE: Direct access to super-reuse TRX, S7 )
TCH SEIZURES FOR
NEW CALL
/c1009
tch_norm_seiz
TCH REQUESTSFOR NEW CALL
/c1026
tch_call_req
DIR ACC TCH REQ REJ DUE LACK
/c1166
tcH_req_dir_acc_rej_due_lack
TCH SEIZURES FOR
DIRECT ACCESS
/c1165
succ_tch_seiz_for_dir_acc
Congestion
No Congestion
Direct Access
(SDCCH-TCH HO)TO SUPER TRX
Cell A (source, regular TRX)
Cell A (source, regular TRX)
Normal TCH call request handling
-
8/13/2019 BSS Formula
19/61NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 19
Direct Access in success/c4057
bsc_i_sdcch_tch
Cell A (source, regular TRX)
TCH REQUESTS
/c1010
tch_request
Cell B (target, super TRX)
Direct Access in att
/c4060
bsc_i_sdcch_tch_at
Direct Access OUT
SUCC/c4065
bsc_o_sdcch_tch
Direct Access OUT
ATT/c4068
bsc_o_sdcch_tch_at
TCH request and Inter cell direct access
TCH SEIZURES FOR
NEW CALL
/c1009
tch_norm_seiz
Direct Access(SDCCH-TCH HO)
TO SUPER TRX
CELL B
(FEATURE: Direct access to super-reuse TRX, S7 )
Author: J.Pekkarinen 10/97
Version: 1.0 24.10.97
PMWG approval.: 1.0 6.11.97
TCH REQUESTSFOR NEW CALL
/c1026
tch_call_req
Congestion
Cell A (source, regular TRX)
Normal TCH call request handling
No Congestion
DIR ACC TCH REQ REJ DUE LACK
/c1166
tcH_req_dir_acc_rej_due_lack
TCH SEIZURES FOR
DIRECT ACCESS
/c1165
succ_tch_seiz_for_dir_acc
-
8/13/2019 BSS Formula
20/61NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 20
Calls and drop calls on TCH, area view
Author: J.Neva 12/96
Version: 1.2 26.5.98
PMWG approval.: 26.5.98Area (nn cells)
DR IN SUCC
/DR_4
msc_i_sdcch_tch
/c4044 or
bsc_i_sdcch_tch
/c4057
NEW CALLS
ON TCH
NORMAL END
(unknown)
HO OUT FROM
AREA
(unknown)
TCH DROPS
/DCF_0
TCH_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 SEIZURES FOR
NEW CALL
/c1009
tch_norm_seiz
This is not triggered
in S6 feature TCH
assignment to super
reuse TRX in IUO
(intra and inter cell HO)
NOTE:
Drop call by pre-emption
- 1st priority call requeste to be
established
- all TCH seized
- lower priority calls on
==>p_nbsc-service.dropped_call is
triggered
(NOT TCH failure counters)
FACCH CALL SETUP
/c1099 (S5)
tch_seiz_due_sdcch_con
-
8/13/2019 BSS Formula
21/61NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 21
Counting Erlangs (p_nbsc_res_avail) Author: J.Neva 10/98Version: 1.0
PMWG approval.:2.12.98
Sampling
every 20sec
Cumulative
sum
Nbr of
samples
BTS xx
TRX-nn
Counter values
sent to NMS2000
and stored once in
measurment period
BCCH TCH TCH TCH TCH TCH TCH Ave_busy_tch Res_av_denom14
seized seized -> 2 1 0 secseized seized seized seized -> 2+4 2 20 sec
seized -> 2+4+1 3 40 sec
->
seized seized seized -> +3 180 3580sec
The same principle is used in IUO measurement.
-
8/13/2019 BSS Formula
22/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 22
Counting Erlangs (p_nbsc_dual_band)
Author: Markku Rsnen 11/98
Version: 1.0
PMWG approval.:2..12.98
BTS xx
TRX-nn
one TCH TSL
Call on this TCH
TCH seized(measurement startsfrom the estab_ind, i.e. MS
is on TCH)
Measurement Period 2
TCH released(measurement stopsfrom the release of the TCH)
THC reservation length 3000 sec
59000 tch_single_band_hold_time
59001 tch_dual_band_hold_time
or
At release of TCH:
In the BSC, the length of the reservation (unit 0.48 sec) isadded to
Also, one of the following counters is increased by one:
59002 tch_single_band_hold_reserv
59003 tch_dual_band_hold_reserv
or
NOTE: In the above example, the TCH reservation will not cause any call seconds to Measurement Period 1, andthe reservation counter is also updated only at Measurement Period 2.
Measurement Period 1
At the end of the measurement period, the values of the measurement counters are transmitted to the NMS/2000
-
8/13/2019 BSS Formula
23/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 23
Counting Erlangsdifferencies between dual band and 20 sec sampling methods
Author: Markku Rsnen 11/98
Version: 1.0
PMWG approval.:2.12.98
SDCCH
TCH
When BSC receives EstablishIndication,the RCS process is started andTCH reservation time for Dual Band
measurement is started
MS releases call
orHO to another TCH
Resource availability starts atthe start of the TCH reservation
Dual Band
Resource Availability
(20s sampling)
RCS process and the DBmeasurement is stopped whenBSC receives Release Indication
Resource Availabilitymeasurement
is stopped when BSC receivesrf channel release ack fromthe BTS
TCH
TCH
CALL SETUP
HO
Dual Band
Resource Availability
Dual Band
Resource Availability
-
8/13/2019 BSS Formula
24/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 24
Traffic per codec version (S5->)
Author: J.Neva 11/98
Version: 1.0
PMWG approval.: 2.12.98
V1 CODEC FTCH SEIZURES
/C1108
tch_full_seiz_speech_ver1
V2 CODEC FTCH SEIZURES (EFR)/C1109
tch_full_seiz_speech_ver2
V3 CODEC FTCH SEIZURES
/C1110
tch_full_seiz_speech_ver3
V1 CODEC FTCH FAILURES
/C1127
tch_ended_due_transc_fr_rate1
V2 CODEC FTCH FAILURES
/C1128tch_ended_due_transc_fr_rate2
V3 CODEC FTCH FAILURES
/C1129
tch_ended_due_transc_fr_rate3
NOTE: Codec counters are triggeredin channel relase (even if the calldrops)Data calls do not trigger codeccounters.
V3 CODEC HTCH SEIZURES
/C1113
tch_half_seiz_speech_ver3
V3 CODEC HTCH FAILURES
/C1132
tch_ended_due_transc_hr_rate3
V2 CODEC HTCH SEIZURES
/C1112
tch_half_seiz_speech_ver2
V2 CODEC HTCH FAILURES
/C1131
tch_ended_due_transc_hr_rate2
Enhnanced Full rate (v2, EFR)EFR would provide speech quality
comparable to landline for GSM.
EFR speech codec has been specified
by Nokia with university of Sherbrooke
co-operation..
EFR codec was initially spec ified for ANSI.
ETSI selected the same codec in SMG#16.
V1 CODEC HTCH SEIZURES
/C1111
tch_half_seiz_speech_ver1
V1 CODEC HTCH FAILURES
/C1130
tch_ended_due_transch_hr_rate1
TCH SEIZURES FOR
NEW CALL
/c1009
tch_norm_seiz
TCH SEIZURES FOR
HO (incl. DR in)
/c1008
tch_ho_seiz
TCH FCS SEIZURES/c1099 (S5)
tch_seiz_due_sdcch_con
TCH SEIZURES FOR DATA CALLS
Sp
eech
Data calls do not trigger codec
counters.Codec seizure counters
Version 3 is for future use.
-
8/13/2019 BSS Formula
25/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 25
Aif circuit pool related counters
Author: J.Neva 1/99
Version: 1.0
PMWG approval.:
BSC O HO UNSUCC
/C4096
bsc_o_unsucc_a_int_circ_type
BSC I HO UNSUCC
/C4097
bsc_i_unsucc_a_int_circ_type
MSC O .HO UNSUCC
/C4102
msc_controlled_out_ho
MSC I HO UNSUCC
/C4101
msc_controlled_in_ho
MSC OUT SUCC HO
/C
ext_out_switch_crc_pool
MSC IN SUCC HO
/C
estab_ext_in_switch_circ_pool
INTRA CELL HO UNSUCC/C4098
ho_unsucc_a_int_circ_type
MSC I HO SUCCESSES
/C4093
msc_i_succ_switch_circ_pool
MSC I HO ATTEMPTS
/C4092
msc_i_att_switch_circ_pool
MSC O HO SUCCESSES
/C4095
msc_o_switch_circ_pool
MSC O HO ATTEMPTS
/C4094
msc_o_att_switch_circ_pool
HO ATT DUE TO AIF CIRCUIT TYPE
CHANGE
/C4099
ho_att_due_switch_pool
p_nbsc_ho
REJECTIONS DUE TO MISMATCH
/C1122
tch_rej_due_req_ch_aif_crc
p_nbsc_cc
p_nbsc_traffic
POOL AVAILABLE, RETRY
/C500934
m_switch_crc_pool
POOL NOT AVAILABLE
/C500935
m_speech_version_unavail
-
8/13/2019 BSS Formula
26/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 26
Handover enabling
Disable internal HO
Author: J.Neva 12/96
Version: 0.2 5.4.98
=Yes All HOs are MSC controlled (used only for test purposes!)
When "YES" the load between MSC and BSC is increased strongly, since all the
handovers are signalled via MSC.=No
Candidate
= serving cell
Yes BSC controlled intra cell HO
No
First candidate
belongs to own BSC
NoMSC controlled HO
Yes
Ext HO if other BSS=No
BSC controlled inter cell HO
=Yes
Cells belonging to
another BSC in the list
NoBSC controlled inter cell HO
Yes
MSC controlled HO
(Source of info:Tarja Hiltunen)
-
8/13/2019 BSS Formula
27/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 27
Handovers by channel types
HO attempts
TCH-TCH
HO attempts
/ho_16
msc_o_tch_tch_at
+ msc_i_tch_tch_at+ bsc_o_tch_tch_at
+ bsc_i_tch_tch_at
+ cell_tch_tch_at
SDCCH-TCH
HO attempts
/ho_17
msc_o_sdcch_tch_at+ msc_i_ sdcch_tch _at
+ bsc_o_ sdcch_tch _at
+ bsc_i_ sdcch_tch _at
+ cell_ sdcch_tch _at
SDCCH-SDCCH
HO attempts/ho_18
msc_o_sdcch_at
+ msc_i_sdcch_at
+ bsc_o_sdcch_at
+ bsc_i_sdcch_at
+ cell_sdcch_at
TCH-TCH
HO successes
/ho_19
msc_o_tch_tch
+ msc_i_tch_tch+ bsc_o_tch_tch
+ bsc_i_tch_tch
+ cell_tch_tch
TCH-TCH
HO failures
= ho_16 - ho_19
SDCCH-TCH
HO successes
/ho_20
msc_o_ sdcch_tch
+ msc_i_ sdcch_tch
+ bsc_o_ sdcch_tch
+ bsc_i_ sdcch_tch
+ cell_ sdcch_tch
SDCCH-TCH
HO failures
= ho_17 - ho_20
SDCCHSDCCH
HO successes
/ho_21
msc_o_sdcch
+ msc_i_sdcch
+ bsc_o_sdcch
+ bsc_i_sdcch
+ cell_sdcch
SDCCH
HO failures
= ho_18 - ho_21
Author: J.Neva 8/96
Version: 1.0 6.9.96
PMWG approval.: v1.0 6.9.96
-
8/13/2019 BSS Formula
28/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 28
Handovers by control
HO attempts
MSC controlled
HO attempts
/ho_22
msc_o_tch_tch_at
+ msc_i_tch_tch_at+ msc_o_ sdcch_tch _at
+ msc_i_ sdcch_tch _at
+ msc_o_sdcch_at
+ msc_i_sdcch_at
MSC controlled
HO failures
= ho_22 - ho_25
BSC controlled
HO attempts
/ho_23
bsc_o_tch_tch_at
+ bsc_i_tch_tch_at+ bsc_o_ sdcch_tch _at
+ bsc_i_ sdcch_tch _at
+ bsc_o_sdcch_at
+ bsc_i_sdcch_at
Intra cell
HO attempts/ho_24
cell_tch_tch_at
+ cell_sdcch_tch_at
+ cell_sdcch_at
MSC controlled
HO successes
/ho_25
msc_o_tch_tch
+ msc_i_tch_tch+ msc_o_ sdcch_tch
+ msc_i_ sdcch_tch
+ msc_o_sdcch
+ msc_i_sdcch
BSC controlled
HO successes
/ho_26
bsc_o_tch_tch
+ bsc_i_tch_tch
+ bsc_o_ sdcch_tch
+ bsc_i_ sdcch_tch
+ bsc_o_sdcch
+ bsc_i_sdcch
BSC controlled
HO failures
= ho_23 - ho_26
intra cell
HO successes/ho_27
cell_tch_tch
+ cell_sdcch_tch
+ cell_sdcch
BSC controlled
HO failures= ho_24 - ho_27
Author: J.Neva 8/96
Version: 1.0 6.9.96
PMWG approval.: v1.0 6.9.96
-
8/13/2019 BSS Formula
29/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 29
BSC controlledoutgoing handovers
Outgoing BSC ctrl
HO attempts
/ho_11
bsc_o_tch_tch_at
+ bsc_o_sdcch_tch_at
+ bsc_o_sdcch_atOutgoing BSC ctrl
HO failures
/hof_8a
= ho_11
- bsc_o_succ_ho
Outgoing BSC ctrl
HO successes
/c4014
bsc_o_succ_ho
BSC outgoing HO,
drop call
/dcf_3/c4084
bsc_o_drop_calls
Author: J.Neva 8/96
Version: 1.2 23.9.96
PMWG approval.: 1.2 4.12.96
Blocked
/ c4072
bsc_o_fail_lack
end of HO
/c4016
bsc_o_end_of_ho
return to old
/c4015
bsc_o_fail_ret
Not allowed
/c4038
bsc _o_not_allwd
Call clear
/c4042bsc_o_call_clr
wrong A-if circuit type/ c4096 (S5)
bsc_o_unsucc_a_int_circ_type
HO iterrupted and call
may drop
end of HO BSS
/c4017
bsc_o_end_ho_bss
HO iterrupted and call drops
Call drops after conn_ack
-
8/13/2019 BSS Formula
30/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 30
MSC controlledoutgoing handovers
Outgoing MSC ctrl
HO attempts
/ho_9
msc_o_tch_tch_at
+ msc_o_sdcch_tch_at
+ msc_o_sdcch_atOutgoing MSC ctrl
HO failures
/ho_6a
=ho_9
- msc_o_succ_ho
Outgoing MSC ctrl
HO successes
/c4004
msc_o_succ_ho
MSC outgoing HO,
drop call
/dcf_10
= ???? S7 ??
Author: J.Neva 8/96
Version: 1.2 29.4..97
PMWG approval.: 1.2 30.6.97
blocked
/c 4055
msc_o_fail_lack
end of HO
/c4007
msc_o_end_of_ho
return to old
/c4006
msc_o_fail_ret
Not allowed
/c4037
msc_o_not_allwd
Call clear
/c4041
msc_o_call_clear
wrong A-if circuit type
/ c4102 (S5)
msc_controlled_out_ho
adj.cell error
/c4100 (S5)
msc_o_adj_cell_id_err_c
HO interrupted and call
may drop
end of HO BSS
/c4008
msc_o_end_ho_bss
-
8/13/2019 BSS Formula
31/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 31
BSC controlledincoming handover
Incoming BSC ctrld
HO successes
/c4010
bsc_i_succ_ho
Incoming BSC ctrld
HO failures
/hof_7a
ho_10-
bsc_i_succ_ho
Incoming BSC ctrld
HO attempts
/ho_10
bsc_i_tch_tch_at
+ bsc_i_sdcch_tch_at
+ bsc_i_sdcch_at
Author: J.Neva 11/96
Version: 1.1 5.12.97
PMWG approval.: 1.1 9.12.1296
blocking
/ c4011
bsc_i_fail_lack
connection failure
/c4012
bsc_i_fail_conn
end of HO/c4081
bsc_i_end_of_ho
wrong A-if circuit type
/c4097 (S5)
bsc_i_unsucc_a_int_circ_type
radio chn.act.failure
/c4013
bsc_i_fail_BSS
HO interrupted and call
may drop
Drop calls
/c4083
=bsc_i_drop_calls
-
8/13/2019 BSS Formula
32/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 32
MSC controlledincoming handover
Incoming
HO successes
/ho_32=
msc_i_succ_ho
Incoming
HO failures
/hof_15=
ho_35- ho_32
Incoming
HO attempts
/ho_35
msc_i_tch_tch_at
+ msc_i_sdcch_tch_at
+ msc_i_sdcch_at
Author: J.Neva 11/96
Version: 1.0 23.11.96
PMWG approval.: 1.0 4.12.96
blocking
/ 4001
msc_i_fail_lack
connection failure
/c4002
msc_i_fail_conn
end of HO
/c4080
msc_i_end_of_ho
wrong A-if circuit type
/ c4101 (S5)
msc_controlled_in_ho
radio chn.act.failure
/c4003
msc_i_fail_BSS
HO interrupted and call
may drop
HO interrupted
Author: J Neva 8/96
-
8/13/2019 BSS Formula
33/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 33
Intracell handovers
Intra cell
HO attempts
/ho_24
cell_tch_tch_at
+ cell_sdcch_tch_at
+ cell_sdcch_at
intra cell
HO successes
/ho_27=
cell_tch_tch
+ cell_sdcch_tch
+ cell_sdcch
Intra cell
HO failures
/hof_9 =
ho_24 - ho_27
Radio chn.activation failure
/c4021
cell_fail_BSS
MS lost
/c4020
cell_fail_move
Author: J.Neva 8/96
Version: 1.2 12/97
PMWG approval.: 1.2 11.2.98
Blocked/c4019
cell_fail_lack
Return to old
/c4022
cell_fail_ret
Intracell HO not allowed
/c4036
cell_not_allwd
Call clear or chn.blocking started
/c4039
cell_call_clr
Drop calls
/c4085
=cell_drop_calls
Incremented if failure occurs
after HO commandHO interrupted
and call
may drop
Wrong A-interface circuit type ????
/c4098
ho_unsucc_a_int_crct_type
Author: J Neva 9/96
-
8/13/2019 BSS Formula
34/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 34
Handover causes
Author: J.Neva 9/96
Version: 1.1 20.5.98
PMWG approval.: 1.0 11.2.97
Distance
/c4027
cause_distance
MSC invocation
(Traffic reason HO)
/c4028
cause_msc_invoc
Umbrella
/c4031
cause_umbr
OMC
(Forced HO by user)
/c4033
cause_omc
Directed Retry and
Intelligent Directed Retry
/c4079cause_dir_retry
Pre-emption
/c4085 (S3)
cause_pre_emption
Rapid field drop
/c4087 (S4)
cause_field_drop
Low distance
/c4088 (S4)
cause_low_distance
Bad CI
/c4089 (S4)
cause_bad_CI
Good CI
/c4090 (S4)
cause_good_CI
Slow moving MS
/c4091 (S5)
cause_ho_due_slow_mov_ms
UL quality
/c 4023
cause_up_qual
eg.20%
UL level/c4024
cause_up_lev
eg.10-15%
DL quality
/c4025
cause_down_qual
eg.20%
DL level
/c4026
cause_down_lev
eg.10-15%
UL interference
/c4029
cause_interf_up
prefer. 0%DL interference
/c4030
cause_interf_down
prefer. 0%
Pbdgt
/c4032
cause_pbdgt
20-30%
Switch circuit pool
/c4099 (S5)
switch_crcr_pool
Bad Rxlev on super
/c4109 (S7)
bad_rxlev_on_sup
Good Rxlev on reg
/c4110 (S7)good_rxlev_on_reg
Direct Access
/c4128 (S7)
direct_access
MS slow speed/c4105 (S6)
ho_due_ms_slow_speed
MS high speed
/c4106 (S6)
ho_due_ms_high_speed
ERFD HO
Enhanced Rapid
Field Drop
/c4111 (S7)
erfd_ho
Channel administration
/c4034 NOT IN USE
cause_ch_adm
Traffic
/c4035 NOT IN USE
cause_traffic
NOT IN USE
Intra cell DR (S6)
--> DR counter is updated
/c4079
cause_dir_retry
H d C H d TAuthor: J.Pekkarinen 12/97
-
8/13/2019 BSS Formula
35/61
NOKIA Customer Services / NOS / Statistics Engineering / J.Neva / F_BSS_15.PPT / 10-Dec-98 / page: 35
Handover Causes per Handover Types
Handover Causes per Handover Types Version:PMWG appr.: OPEN
Intra Cell TCH HO
UL interference /c4029
OMC (forced ho) /c4033
DL quality /c4025
DL interference /c4030
Pre-emption /c4085Low distance /c4088
Distance /c4027
Bad CI /c4089
Good CI /c4090
Bad Rxlev on super /c4109
Good Rxlev on reg /c4110
Inter Cell TCH HO
UL quality /c4023
UL level /c4024UL interference /c4029
OMC (forced ho) /c4033
DL quality /c4025
DL level /c4026
DL interference /c4030
Pre-emption /c4085
Low distance /c4088
Distance /c4027
Bad CI /c4089
Good CI /c4090
Direct Access /c4128
Pbdgt /c4032
Umbrella /c4031MSC invoc (traffic ho)/c4028
Slow moving MS /c4091
Rapid field drop /c4087
MS slow speed /c4105
MS high speed /c4106
ERFD HO /c4111
Direct Access /c4128
External TCH HO (source)
UL quality /c4023
UL level /c4024
UL interference /c4029
Pbdgt /c4032
OMC (forced ho) /c4033DL quality /c4025
DL level /c4026
DL interference /c4030
Pre-emption /c4085
Low distance /c4088
Distance /c4027
Umbrella /c4031
MSC invoc (traffic ho)/c4028
Slow moving MS /c4091
Rapid field drop /c4087
MS slow speed /c4105
MS high speed /c4106
ERFD HO /c4111Switch circuit pool /c4099
Intra Cell SDCCH HO
UL interference /c4029
OMC (forced ho) /c4033
DL quality /c4025
DL interference /c4030
Pre-emption /c4085Low distance /c4088
Distance /c4027
Bad CI /c4089
Good CI /c4090
Bad Rxlev on super /c4109
Good Rxlev on reg /c4110
Inter Cell SDCCH HO
UL quality /c4023
UL level /c4024
UL interference /c4029
OMC (forced ho) /c4033
DL quality /c4025
DL level /c4026
DL interference /c4030
Pre-emption /c4085
Low distance /c4088
Distance /c4027
Bad CI /c4089
Good CI /c4090
Direct Access /c4128
Pbdgt /c4032
Umbrella /c4031
MSC invoc (traffic ho)/c4028Slow moving MS /c4091
Rapid field drop /c4087
MS slow speed /c4105
MS high speed /c4106
ERFD HO /c4111
Ext.SDCCH HO (source)
UL quality /c4023
UL level /c4024
UL interference /c4029
Pbdgt /c4032
OMC (forced ho) /c4033DL quality /c4025
DL level /c4026
DL interference /c4030
Pre-emption /c4085
Low distance /c4088
Distance /c4027
Umbrella /c4031
MSC invoc (traffic ho)/c4028
Slow moving MS /c4091
Rapid field drop /c4087
MS slow speed /c4105
MS high speed /c4106
ERFD HO /c4111Switch circuit pool /c4099
Directed Retry
Intra Cell SDCCH to TCH HO
Inter Cell SDCCH to TCH HO
External SDCCH to TCH HO
Directed retry /c4079
TCH to TCH HOsSDCCH to
SDCCH HOs
SDCCH to
TCH HOs
(DRs)
Direct Access (DAC) (S7)
Intra Cell SDCCH to TCH DAC
Inter Cell SDCCH to TCH DAC
Direct Access /c4128
SDCCH to
TCH HOs
(Direct Accesses)
(Intra / Inter cell)
-
8/13/2019 BSS Formula
36/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 36
Paging capacity, air interface (until S7)
Paging and access grant channels use the same DL physical channel (Nokia uses timeslot 0) of BCCH carrier.
Paging has priority if AG=0. AG is sent also on PCH if there is no paging to send.
combined capacity =
12 slots per multiframe (combined control channel)
36 slots per multiframe (noncombined control channel)
message sent on paging or access grant channel takes 4 slots
3 messages per multiframe (combined control channel)
= 12 messages per second
9 messages per multiframe (noncombined control channel)
= 38 messages per second
MFR = Number of Multiframes between Paging (2..9)
AG = Number of Blocks Reserved for Access Grant
(0..7 if noncombined, 0..2 if combined, 1..7 if SBCH used in SDCCH/8)
(3-AG)*MFR (combined control channel)
(9-AG)*MFR (noncombined control channel)
Nbr of Paging Groups =
Each paging group has separate buffer of 8 Abis commands. MS defines its group from IMSI.
Buffering delay can take 2..16secMax.paging buffer size = 8* Nbr of Paging Groups
Paging buffer space (BTS) = free buffers (max 8) * Nbr of Paging Groups /2
one paging message can contain
- max. 2 IMSI
- max. 4 TMSI
Final choise is on BTS.
Min Paging buffer space (BSC) = min_paging_buf(counter 3018)
MBCCHC and MBCCB are combined control channels
MBCCH is non-combined control channel
BSC stores the smallest value per BTS over the measurement period.
If the value = 0 paging messages have been lost (paging may still be succesfull thanks to repaging)
Sent in CCCH_Load_Ind from BTS to BSC. 1/2 is is an additional safety margin to give an early
warning of potential paging capacity problems.
Author: J.Neva 8/96
Version: 1.1 18.2.97
PMWG approval.: 1.1 9.12.96
Average Paging buffer space (BSC) = ave_pch_load / res_acc_denom2When 3018 is less than Paging_Buffer_Limit
(it is defined in BSC; >EGO, default = 1, threshold = 0...16). then BSC sends an overload message
to MSC. There is no automatic reallocation of the channel structure in case of overload.
Nokia MSC does not use the overload message because paging is by LAs not by BTS.
-
8/13/2019 BSS Formula
37/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 37
Author: J.Pekkarinen 12/97
Version: 1.0
PMWG appr.: 11.10.98
Deleted Paging Commands
/c3038 (S7)
Average Paging Buffer Occupancy %
/c3036/c3037 (S7)
Average PCH Load on CCCH (S1)
/c3008/c3009
Minimum Paging Buffer on CCCH
/c3018
Maximum Paging Buffer Occupancy %
/c3035 (S7)
Paging Buffer Occupancy
Paging Buffer
Paging buffer, capacity (S7)
Each time a paging multiframe cycle ends
the occupancy percentage
(occupied buffer space versus maximum space)
of each paging queue is calculated
Some group specific paging queue becomes full
so that a paging command cannot be stored to the
buffer and the paging command is deleted.
Indicates the remaining space for
Paging Commands.
The smaller the value, the greater the loadon the PCH.
Minimum size of the paging buffer
on a CCCH.
The smaller the value, the greater the load
on the PCH.
NOTE the way BTS counts:
free buffers (max 8) * Nbr of Paging Groups /2
P i it i i t f (S7 d
-
8/13/2019 BSS Formula
38/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 38
Paging capacity, air interface (S7 andDF4/B11) 1/4
combined capacity =
12 slots per multiframe (combined control channel)
36 slots per multiframe (noncombined control channel)
message sent on paging or access grant channel takes 4 slots
3 messages per multiframe (combined control channel)
= 12 messages per second
9 messages per multiframe (noncombined control channel)
= 38 messages per second
MFR = Number of Multiframes between Paging (2..9)
AG = Number of Blocks Reserved for Access Grant
(0..7 if noncombined, 0..2 if combined, 1..7 if SBCH used in SDCCH/8)
(3-AG)*MFR (combined control channel)
(9-AG)*MFR (noncombined control channel)
Nbr of Paging Groups =
one paging message can contain
- max. 2 IMSI
- max. 4 TMSI
Final choise is on BTS.
MBCCHC and MBCCB are combined control channels
MBCCH is non-combined control channel
Author: Markku Rsnen10/98
Version: 0.1 21.10.98
PMWG approval.:
Calculation of theamount ofPaging Groups
Paging and access grant channels use the same DL physical channel (Nokia uses timeslot 0) of BCCH carrier.
Access Grant has priority if AG=0. If AG 0, paging has priority on paging blocks. If AG0, Access Grant is sent also on PCH
if there is no paging to send. If AG=0, Access Grant is sent on PCH with priority.
NOTE: Calculation of the amount of paging groups is the as same prior to S7/DF4
A th M kk R 10/9
8
-
8/13/2019 BSS Formula
39/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 39
Paging capacity, air interface (S7 and DF4/B11) 2/4Author: Markku Rsnen 10/98
Version: 0.1 21.10.98
PMWG approval.:
Calculation of the amount of Paging Groups
Each paging group has a separate buffer. The depth of the buffer (PagingGroup Queue Depth) depends on BS-PA-MFRMS parameter. Max_lead_time
= 5, not modifiable. The Queue Depth indicates how many radio interface
Paging Requests it is possible to store in the buffer.
Paging Group Queue Depth= MAX(ROUND(max_lead_time * 1000 / (BS-PA-MFRMS * 51 * 4.615)),1)
Counter N: N(New) = N(current) + 1 for TMSI paging commands
Paging Buffer Space =The current value is sent in the the CCCH_Load_Ind from BTS to BSC. BSC stores the smallest value.
When PBS < 1, BSC sends an overload message to MSC. There is no automatic reallocation of the
channel structure in case of overload. Nokia MSC does not use the overload message because
paging is by LAs not by BTS.
MS defines its group from IMSI
Example values of Paging Group Queue Depth
BS-PA-MFRMS Paging Group Queue Depth
4 5
6 4
8 3
Counter N: N(New) = N(current) + 2 + (N(current) mod 4) div 3 for IMSI paging command For each Paging Group, there is a Counter N to follow up the usage of the
buffer.
Counter N: N(Max) = 4*(Paging Group Queue Depth)
Amount of deleted paging commands is reported to the BSC in CCCH_Load_ind,
and BSC adds this amount to counter 3038 delete_paging_command.
Each time a Paging Request is sent to the Radio Interface, N is decremented
according to formula N(new) = max{N(current) - 4, 0}
Free Space Total (IMSI)
= Free SpaceTotal (TMSI) / 2
TMSI paging command = Abis Paging Command with TMSI identity
IMSI paging command = Abis Paging Command with IMSI identity
Free Space (TMSI)= N(max) - N(current)
Free Space Total (TMSI)= Sum of Free Space (TMSI) in all queues
Free Space available in the Paging Group Queue for TMSI pages
N(new) > N(Max) ? If N(new) > N(max), the paging command is deleted and
N(current) remains the same as before
Average Buffer Occupancy = For each paging group, and each paging multiframe, occupancy % = 100 *(N/N(max)) %
AVERAGE(occupancy%) over all paging groups for each paging multiframe is reported from BTS to BSC in CCCH_Load_Ind
Average Buffer Occupancy ( BSC) = Ave_paging_buffer(c3036) / res_acc_denom5(c3037)
Maximum Buffer Occupancy
Percentage =
Peak value of all Average Buffer Occupancy values in the
CCCH_Load_Ind within the period is stored in BSC is a
separate countermax_paging_buffer_capa(counter 3035)
Min Paging buffer space (BSC) = min_paging_buf(counter 3018)
nbr of additional paging commands with IMSI that is possible to store to the BTS.
Author: Jukka Pletola 10/98
-
8/13/2019 BSS Formula
40/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 40
Paging capacity, air interface (S7 and DF4/B11) 3/4
Counter N and the formation of Radio Interface Paging Requests from Abis Paging Commands:
in this example, one Paging Group Queue is described
1. msg
2. msg
3. msg
4. msg
5. msg
6. msg
1 2 3 4
98
12 13 14
5 6
7
10 11
15
IMSI TMSI empty
Nnew= Nold+ 1 for TMSI paging commandNnew= Nold+ 2 + (Noldmod 4) div 3 for IMSI paging command
Buffer full when Nnew > Nmax
1 2 3 4 5 6 987 10 11 12 13 14 15
1. msg 2. msg 3. msg 4. msg 5. msg 6. msg
1 2 3 4 5 7 10 11 12 14 16 17 18 19 22NPaging Request Type
Formula for N for IMSI paging command works out as follows. Nnew = Nold +2 always but the case when the new
IMSI paging command forces us to leave an "empty" spot to the Paging Request - this is the case if the pagingrequest has earlier either 1 TMSI page and 1 IMSI page (2. Msg above), or 3 TMSI pages (5 msg above) - thenNnew = Nold+3.
There is no passing lane in the paging buffers - Paging Commands are put to messages in the order in which theycome to the BTS. So, in the above example, it is not possible to take mobile identity 8 from 3.msg, and put itbefore mobile identity 7 so that we could include it in 2.msg where there is an empty space for one TMSI mobileidentity
3
1
2
1
2
1
Author: Jukka Pletola 10/98
Version: 0.1
PMWG approval.:
Author: Jukka Pletola 10/98
-
8/13/2019 BSS Formula
41/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 41
Paging capacity, air interface (S7 and DF4/B11) 4/4
Calculation and reporting of the maximum and average buffer occupancy percentages
PMF_average
maximum
load-%
Paging group index
load-%
time
average
One CCCH reportingperiod
BSC stores the maximum value receivedduring the measurement period (e.g. 60 min)c3035 max_paging_buffer_capa
BSC adds the values receivedduring the measurement period (e.g. 60 min)c3036 ave_paging_buffer_capaand the number of CCCH_load_ind messagesc3037 res_acc_denominator_5
Paging Multiframe PMF
After each reporting period, CCCH Load Ind is
sent to the BSC with the deleted page,maximum and average buffer occupancyinformation
CCCH reporting periodis a HW data parameter at theBTS, the default period is 30*4*51*4.615ms = appr. 28sec.
At the end of each Paging Multiframe Cycle(Paging Multiframe Cycle= each Paging Groupsent once), the load (or occupancy)is calculated as 100*(N/N(max)) %.
From this, the ABO = PMF_average =AVERAGE(occupancy-%) is calculated
The ABOs are then collected overthe CCCH reporting period, theaverage over the CCCH reportingperiod is calculated and themaximum selected
Author: Jukka Pletola 10/98
Version: 0.1
PMWG approval.:
AB O= Average Buffer Occupancy
-
8/13/2019 BSS Formula
42/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 42
Access Grant capacity
BTS
AG BLOCKING (blck_13)
sum(del_ind_msg_rec)100 * ----------------------------------------------------%
sum(imm_assgn_rej+imm_assgn_sent)
table = p_nbsc_res_acc
BSC Immediate Assignment
Immediate Assignment Rejected
c3005
del_ind_msg_rec
Delete indicationOverflow of AG buffer
How many times Immediate Assignment or
Immediate Assignment Reject have been
lost due to AG buffer overflow
Author: J.Neva 10/96
Version: 1.1 12/98
PMWG approval.:1.1 11.2.98
Parameters:
AG = Number of Blocks Reserved for Access Grant
(0..7 if noncombined, 0..2 if combined, 1..7 i f SBCH used in SDCCH/8)
NOTE: AG=0 can lead to unpredictable delay of AG messages
OR
Sent on AGCH but alternatively on PCH
if there is free capacity
Buffer capacity = 8 Abis messages
Returned for each deleted AGCH message
c3001
imm_assgn_sent
c3002
imm_ass_rej(MS is not allowed to attempt new RR-
establishment until T3122 expires)
This can include 1 - 4 Immediate Assignment
Reject -Messages (from S6) !
-
8/13/2019 BSS Formula
43/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 43
Random Access
Nbr of RACH slots
ave_rach_slot/res_acc_denom1
Peak RACH load
peak_rach_load
Average RACH busy
ave_rach_busy/res_acc_denom3
RACH detection triggered when
level above -100dBm estimatedat the RACH slot
Capacity
Load
BTS
TRX
RACH
RACH has to pass
- S/N test (pattern)
- parity test
BSC and OMC can know
only about the RACH which
passed
BSCCOUNTERS
Average RACH access
ave_rach_access/res_acc_denom4
Author: J.Neva 10/96
Version: 1.1 18.2.97
PMWG approval.: 1.1 30.6.97
Average value over the whole measurement period (15min,..)
Absolute peak load
??? recommendations 8.58 version 4.7.0 page 79 ???
BTS sw B9.0 and DF2.0 has enhanced
filtering of ghosts
- energy level check with previousburst info
- All 41 bits of training sequence used
GHOSTS
= SDCCH seizures that do not lead to
a useful benefit
- thermodynamical type of noise
- in band noise from network
- real MS at limit of sensitivity
MS
Before B9 around
10 ghosts per hour
CCCH
LOAD
IND
After B9 around
1 ghosts per hour ?
Max Number Retransmission
(NY1) (values 1,2,4,7)
defines nbr of repetition
Max Number of Repetition
(REP ) defines
time between repetitions
A h J P kk i 12/9
-
8/13/2019 BSS Formula
44/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 44
BCSU Overload (S7)Author: J.Pekkarinen 12/97
Version: 1.0 12/97
PMWG appr.: 1.0 11.2.98
Deleted RACH
/c3041 (S7)
Lower Limit
/c3039 (S7)
Upper Limit
/c3040 (S7)
BCSU Overload Number of refused calls, when overloadlower limit is occured. Other calls are refused
except emergency, MOC and MTC.
Number of refused calls, when overload
upper limit is occured. All calls are refused.
Number of deleted RACHs on a CCCH,
when RACH load is too high.
As reported by BTS.
-
8/13/2019 BSS Formula
45/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 45
Ghosts Author: J.Neva 12/96Version: 1.0 5.12.96
Level
White noise
0
1
2
3
4
5
6
7
8
9
1 611
16
21
26
31
36
41
46
51
56
61
In-band
Disturbances
Real Mobiles
White Noise
-
8/13/2019 BSS Formula
46/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 46
Short Messages
MS
idle
Author: J.Neva 11/96
Version: 1.0 25.11.96
PMWG approval.:1.0 4.12.96
SMS successful/c3028
succ_sdcch_sms_est
SMS unsuccessful
/c3029
unsucc _sdcch_sms_est
SMS
MS
active
SMS successful
/c3026
succ_tch_sms_est
SMS unsuccessful
/c3027
unsucc _tch_sms_est
SDCCH
TCH
SMS
No call on
Call on
-
8/13/2019 BSS Formula
47/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 47
Congestion & blocking
BTS
TRX
RACH
Author: J.Neva 11/96
Version: 1.1 13.3.98
PMWG appr: 1.0 9.12.97
BSC
RACH/NOISE COLLISION
Abis link
Alarm 2720
Telecom Link overload
(030)
SDCCH congestion time (130,216) c2033 = sdcch_cong_time
Blocked SDCCH seiz att (216) c1001 = sdcch_busy_att
Blocking (204,204, 130,216) , csf_1a
AifTC
Processor unit
load (605,614)
avg.70% critical
(avg. 50% for MB)
HLR
TCH congestion time (138, 216), c2027 = tch_cong_time
Blocked TCH call att (216) blck_9
Blocking (204,200,138,216) , csf_3b,csf_3a,csf_3d
No direct counter but
affects csf_2f,-2g
(200, 204, 250)
Aif
Circuit group blocking (602,604)
M058, M026: Max. 1% in BH
Signalling link (SS7) traffic
(511) MML based report
Add link if traffic > 200mErl
NOTE: In MSC terminology
instead of term blocking
there is term call congestion)
RACH load
rach_3, rach_4
(188, 216)
MS
Paging
Paging buffer size (186,216)c3018 =min_paging_buffer
messages lost (202,216)c3005 =del_ind_msg_rec
AG blocking (204, 200, 216)(blck_13)
Access grant
MSC
Processor unit
load (184,212)
avg.70% critical
(avg. 50% for MB)
Processor unit
load (606,615)
avg.70% critical
(avg. 50% for MB)
-
8/13/2019 BSS Formula
48/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 48
Call Success Factors
SDCCH success
ratio
SDCCH access
probability
TCH access
probability
TCH success
ratio
Call success factors
Improvement
by FACCH
call setup
Improvement
by Call Re-establishment
Improvement
by Directed Retry,
Queuing
Call
success
ratio
Author: J.Neva 6/97
Version: 1.1 12/97
PMWG approval.: 1.1 11.2.98
Improvement
by Dynamic
SDCCH
Allocation (S7)
-
8/13/2019 BSS Formula
49/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 49
Call Success Factors (area)
SDCCH success
ratio
CSF_2xx
SDCCH access
probability
CSF_1a
TCH access
probability
CSF_3d
TCH success
ratio
CSF_4p
CSF_1a
SDCCH_busy_att - tch_seiz_due_sdcch_con
100-(100* ----------------------------------------) %
SDCCH_seiz_att
All counters from p_nbsc_traffic.
CSF_2a
sum(SDCCH_RADIO_FAIL+SDCCH_RF_OLD_HO+SDCCH_USER_ACT+SDCCH_BCSU_RESET+SDCCH_NETW_ACT +SDCCH_BTS_FAIL+
SDCCH_LAPD_FAIL+SDCCH_A_IF_FAIL_CALL+SDCCH_A_IF_FAIL_OLD)
100- 100*----------------------------------------------------------------- %
sum(sdcch_assign+sdcch_ho_seiz)
- sum(SDCCH_ABIS_CALL+SDCCH_ABIS_FAIL_OLD)
All counters from p_nbsc_traffic table.
Note: 1) Experience has shown that A-if blocking is not included.
2) Includes not only calls but LUs
CSF_3k
sum(a.tch_call_req-a.tch_norm_seiz)
- sum(b.msc_o_sdcch_tch+ b.bsc_o_sdcch_tch +c.cell_sdcch_tch)
- sum(a.tch_rej_due_req_ch_a_if_crc ; Aif type mismatch or congestion
-(b.bsc_i_unsucc_a_int_circ_type ; Aif circuit pool handover failures
+b.msc_controlled_in_ho
+b.ho_unsucc_a_int_ciric_type))
100- 100* ---------------------------------------------------- %
sum(a.tch_call_req)
- sum(a.tch_rej_due_req_ch_a_if_crc ; Aif type mismatch or congestion
-(b.bsc_i_unsucc_a_int_circ_type ; Aif circuit pool handover failures
+b.msc_controlled_in_ho
+b.ho_unsucc_a_int_ciric_type))
a = p_nbsc_traffic
b = p_nbsc_handover
CSF_4p
sum(a.TCH_RADIO_FAIL+a.TCH_RF_OLD_HO+a.TCH_ABIS_FAIL_CALL+a.TCH_ABIS_FAIL_OLD+a.TCH_A_IF_FAIL_CALL+ a.TCH_A_IF_FAIL_OLD+ a.TCH_TR_FAIL+ a.TCH_TR_FAIL_OLD+
a.TCH_LAPD_FAIL+ a.TCH_BTS_FAIL+ a.TCH_USER_ACT+ a.TCH_BCSU_RESET+
a.TCH_NETW_ACT+a.TCH_ACT_FAIL_CALL)
- sum(b.sdcch_call_re_est + b.tch_call_re_est) ;(call re-establishments)
100 -100* ------------------------------------------------------------------------------ %
sum(a.TCH_NORM_SEIZ) ;normal new calls
+ sum(c.msc_i_sdcch_tch+c.bsc_i_sdcch_tch +c.cell_sdcch_tch) ;DR calls
+ sum(a.tch_seiz_due_sdcch_con) ; FACCH call setup
- sum(b.sdcch_call_re_est + b.tch_call_re_est) ;(call re-establishments)
a = p_nbsc_traffic
b = p_nbsc_res_access
c = p_nbsc_ho
Call success ratio
100* csf_1a/100 * csf_2xx/100 * csf_3d/100 * csf_4p/100
CSF_2f
sum(a.tch_norm_seiz)
=100* ------------------------------------------------------------------------- %
sum(b.succ_seiz_term+b.succ_seiz_orig+b.sdcch_emerg_call+b.sdcch_call_re_est
-b.succ_sdcch_sms_est- b.unsucc_sdcch_sms_est)- sum(a.tch_call_req-a.tch_norm_seiz-msc_o_sdcch_tch-bsc_o_sdcch_tch) ;blocked
- supplem.serv.requests (unknown factor )
- call clears before TCH (unknown factor)
+ netto impact of SDCCH-SDCCH ho (unknown factor)
+ netto icoming DR (unknown factor)
a = p_nbsc_traffic, b = p_nbsc_res_access, c = p_nbsc_ho
Note: 1) Includes also A-if blocking.
2) Works for call re-est. if drop on TCH.
3) If drop on SDCCH and call re-est. then double count in dividor
OR
good:>99,5%
(good:>99,9%)
good:>97%
good:> 95% (??)
SDCCH TCH
Author: J.Neva 4/97
Version: 1.3 16.3.98
PMWG review.: 1.3 16.3.98
good:> 98% (??)
CSF_1a
SDCCH busy att - tch seiz due sdcch con
-
8/13/2019 BSS Formula
50/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 50
CSF_3k
sum(a.tch_call_req-a.tch_norm_seiz)
- sum(b.msc_o_sdcch_tch+ b.bsc_o_sdcch_tch +c.cell_sdcch_tch)
- sum(a.tch_rej_due_req_ch_a_if_crc ; Aif type mismatch or congestion
-(b.bsc_i_unsucc_a_int_circ_type ; Aif circuit pool handover failures
+b.msc_controlled_in_ho
+b.ho_unsucc_a_int_ciric_type))
100- 100* ---------------------------------------------------------- %
sum(a.tch_call_req)- sum(a.tch_rej_due_req_ch_a_if_crc ; Aif type mismatch or congestion
-(b.bsc_i_unsucc_a_int_circ_type ; Aif circuit pool handover failures
+b.msc_controlled_in_ho
+b.ho_unsucc_a_int_ciric_type))
a = p_nbsc_traffic
b = p_nbsc_handover
Call Success Factors (BTS)
SDCCH success
ratio
CSF_2xx
SDCCH access
probability
CSF_1a
TCH access
probability
CSF_3d
TCH success
ratio
CSF_4r
CSF_2a
sum(SDCCH_RADIO_FAIL+SDCCH_RF_OLD_HO+SDCCH_USER_ACT+SDCCH_BCSU_RESET+
SDCCH_NETW_ACT +SDCCH_BTS_FAIL+
SDCCH_LAPD_FAIL+SDCCH_A_IF_FAIL_CALL+SDCCH_A_IF_FAIL_OLD)
100- 100*----------------------------------------------------------------- %
sum(sdcch_assign+sdcch_ho_seiz)- sum(SDCCH_ABIS_CALL+SDCCH_ABIS_FAIL_OLD)
All counters from p_nbsc_traffic table.
Note: 1) Experience has shown that A-if blocking is NOT included.
2) Includes not only calls but LUs
CSF_4r
sum(a.TCH_RADIO_FAIL+a.TCH_RF_OLD_HO+a.TCH_ABIS_FAIL_CALL+a.TCH_ABIS_FAIL_OLD+a.TCH_A_IF_FAIL_CALL+ a.TCH_A_IF_FAIL_OLD+ a.TCH_TR_FAIL+ a.TCH_TR_FAIL_OLD+
a.TCH_LAPD_FAIL+ a.TCH_BTS_FAIL+ a.TCH_USER_ACT+ a.TCH_BCSU_RESET+
a.TCH_NETW_ACT+a.TCH_ACT_FAIL_CALL)
- sum(b.sdcch_call_re_est + b.tch_call_re_est) ;(call re-establishments)
100 -100* ------------------------------------------------------------------------------ %
sum(a.tch_norm_seiz) ;(normal calls)
+ sum(c.msc_i_sdcch_tch+c.bsc_i_sdcch_tch +c.cell_sdcch_tch) ;(DR calls)
+ sum(a.tch_seiz_due_sdcch_con) ; FACCH call setup
+ sum(c.msc_i_tch_tch+c.bsc.bsc_i_tch_tch) ;(TCH-TCH Ho in)
- sum(b.sdcch_call_re_est + b.tch_call_re_est) ;(call re-establishments)
a = p_nbsc_traffic
b = p_nbsc_res_access
c = p_nbsc_ho
Call success ratio
100* csf_1a/100 * csf_2xx/100 * csf_3d/100 * csf_4r/100
CSF_2g
sum(a.tch_norm_seiz) ;(all TCH seiz.for new call)
=100* -------------------------------------------------------------------- %
sum(b.succ_seiz_term+b.succ_seiz_orig
+b.sdcch_call_re_est+b.sdcch_emerg_call) ;(calls,sms, ss reqs)
- sum(b.succ_sdcch_sms_est
+ b.unsucc_sdcch_sms_est) ;(sms attempts)
+ sum(c.msc_i_sdcch + c.bsc_i_sdcch ;(netto SDCCH HO in)-c.msc_o_sdcch - c.bsc_o_sdcch) ;(unknown how big part calls
- sum(a.tch_call_req-a.tch_norm_seiz) ;(DR and air itf blocking)
- supplem.serv. requests ;(unknown factor)
- call clears before TCH ;(unknown factor)
- supplem.serv. requests ;(unknown factor)
a = p_nbsc_traffic, b = p_nbsc_res_access, c = p_nbsc_ho
Note: Includes also A-if blocking. If call re-establ. occurs already on SDCCH
the formula is not correct but if re-est. on TCH it is correct.
3) If drop on SDCCH and call re-est. then double count in dividor
OR
_ y_ _ _ _ _
100-(100* ----------------------------------------) %
SDCCH_seiz_att
All counters from p_nbsc_traffic. Author: J.Neva 4/97
Version: 1.3 16.3.98
PMWG review.: 1.3 16.3.98
-
8/13/2019 BSS Formula
51/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 51
Call Success Factors (area), TCH access
TCH ACCESS PROBABILITY, REAL, (CSF_3d)
sum(a.tch_call_req-a.tch_norm_seiz);calls that could be blocked
- sum(b.msc_o_sdcch_tch+ b.bsc_o_sdcch_tch +c.cell_sdcch_tch)
- sum(a.tch_rej_due_req_ch_a_if_crc ; Aif type mismatch or congestion
-(b.bsc_i_unsucc_a_int_circ_type ; Aif circuit pool handover failures+b.msc_controlled_in_ho
+b.ho_unsucc_a_int_ciric_type))
;calls that are saved by DR
100- 100* -------------------------------------------- %
sum(a.tch_call_req)
- sum(a.tch_rej_due_req_ch_a_if_crc ; Aif type mismatch or congestion
-(b.bsc_i_unsucc_a_int_circ_type ; Aif circuit pool handover failures
+b.msc_controlled_in_ho
+b.ho_unsucc_a_int_ciric_type))
a = p_nbsc_traffic, b = p_nbsc_ho
Author: J.Neva 4/97
Version: 1.4
PMWG review.: 1.4 12.1.1999
TCH ACCESS PROBABILITY, BEFORE DR, (CSF_3a)
sum(a.tch_call_req - a.tch_norm_seiz)
- sum(a.tch_rej_due_req_ch_a_if_crc ; Aif type mismatch or congestion
-(b.bsc_i_unsucc_a_int_circ_type ; Aif circuit pool handover failures+b.msc_controlled_in_ho
+b.ho_unsucc_a_int_ciric_type))
100-100* ------------------------------------- %
sum(a.tch_call_req)
- sum(a.tch_rej_due_req_ch_a_if_crc ; Aif type mismatch or congestion
-(b.bsc_i_unsucc_a_int_circ_type ; Aif circuit pool handover failures
+b.msc_controlled_in_ho
+b.ho_unsucc_a_int_ciric_type))
a = p_nbsc_traffic , b = p_nbsc_ho
TCH ACCESS PROBABILITY, BEFORE DR&Q, (CSF_3j)
sum(a.tch_call_req - a.tch_norm_seiz)
+ sum(a.tch_qd_call_att - XX1 -a.unsrv_qd_call_att);calls that succeeded via queuing
- sum(a.tch_rej_due_req_ch_a_if_crc ; Aif type mismatch or congestion
-(b.bsc_i_unsucc_a_int_circ_type ; Aif circuit pool handover failures
+b.msc_controlled_in_ho
+b.ho_unsucc_a_int_ciric_type))
100-100*------------------------------------------- %
sum(a.tch_call_req)- sum(a.tch_rej_due_req_ch_a_if_crc ; Aif type mismatch or congestion
-(b.bsc_i_unsucc_a_int_circ_type ; Aif circuit pool handover failures
+b.msc_controlled_in_ho
+b.ho_unsucc_a_int_ciric_type))
a = p_nbsc_traffic, b=p_nbsc_ho, XX1=attempts taken from queue to DR (unknown)
TCH ACCESS
tue
sun fr
i
wed
mon
sat
thu
tue
sun
fri
wed
mon
S1
S395,50
96,00
96,50
97,00
97,50
98,00
98,50
99,00
99,50
100,00
Series1
Series2
Series3
Queuing and DR work in parallel. Call is taken out from que of cell A
when the cell list is created and HO is attempted to cell B.
This means that the HO still may fail after call is taken out from queue.
If queuing is succeeded then DR is not tried.
Note error due to XX1!!
-
8/13/2019 BSS Formula
52/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 52
Call Success Factors (area), TCH successAuthor: J.Neva 4/97
Version: 1.3
PMWG review.: 1.3 26.5.98
TCH SUCCESS RATIO, REAL (CSF_4p)
sum(a.TCH_RADIO_FAIL+a.TCH_RF_OLD_HO+a.TCH_ABIS_FAIL_CALL+a.TCH_ABIS_FAIL_OLD+
a.TCH_A_IF_FAIL_CALL+ a.TCH_A_IF_FAIL_OLD+ a.TCH_TR_FAIL+ a.TCH_TR_FAIL_OLD+
a.TCH_LAPD_FAIL+ a.TCH_BTS_FAIL+ a.TCH_USER_ACT+ a.TCH_BCSU_RESET+
a.TCH_NETW_ACT+a.TCH_ACT_FAIL_CALL)
- sum(b.sdcch_call_re_est + b.tch_call_re_est); call re-establishments
100 -100* ------------------------------------------------------------------------------ %
sum(a.TCH_NORM_SEIZ) ;calls started directly in the cell
+ sum(c.msc_i_sdcch_tch+c.bsc_i_sdcch_tch +c.bsc_i_sdcch_tch +c.cell_sdcch_tch) ;DR calls
+ sum(a.tch_seiz_due_sdcch_con) ;FACCH call setup calls
- sum(b.sdcch_call_re_est + b.tch_call_re_est) ; call re-establishments
a = p_nbsc_traffic, b = p_nbsc_res_access, c = p_nbsc_ho
TCH SUCCESS RATIO, REAL (CSF_4o)
sum(a.TCH_RADIO_FAIL+a.TCH_RF_OLD_HO+a.TCH_ABIS_FAIL_CALL+a.TCH_ABIS_FAIL_OLD+
a.TCH_A_IF_FAIL_CALL+ a.TCH_A_IF_FAIL_OLD+ a.TCH_TR_FAIL+ a.TCH_TR_FAIL_OLD+
a.TCH_LAPD_FAIL+ a.TCH_BTS_FAIL+ a.TCH_USER_ACT+ a.TCH_BCSU_RESET+a.TCH_NETW_ACT+a.TCH_ACT_FAIL_CALL)
100 -100* ------------------------------------------------------------------------------ %
sum(a.tch_norm_seiz) ;(normal calls)
+ sum(c.msc_i_sdcch_tch+c.bsc_i_sdcch_tch +c.cell_sdcch_tch +c.cell_sdcch_tch) ;(DR calls)
+ sum(a.tch_seiz_due_sdcch_con) ; FACCH call setup calls
a = p_nbsc_traffic, b = p_nbsc_res_access,c = p_nbsc_ho
Improvement by
Call re-establishment
TCH SUCCESS
94,00
94,50
95,00
95,50
96,00
96,50
97,00
97,50
98,00
98,5099,00
tue
sun fr
i
wed
mon
sat
thu
tue
sun fr
i
wed
mon
Series1
Series2
-
8/13/2019 BSS Formula
53/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 53
Call Success Factors (area), SDCCHAuthor: J.Neva 6/97
Version: 1.2 12/98
PMWG review.: 1.2 11.2.98
SDCCH ACCESS PROBABILITY, AFTER FACCH call setup, (CSF_1a)
SDCCH_busy_att- tch_seiz_due_sdcch_con
100-(100* ----------------------------------------) %
SDCCH_seiz_att
a = p_nbsc_traffic
SDCCH ACCESS PROBABILITY, BEFORE FACCH call setup, (CSF_1)
SDCCH_busy_att
100*(1- --------------) %
SDCCH_seiz_att
a = p_nbsc_traffic
Imrovement by
FACCH call setup
SDCCH ACCESS
SDCCH ACCESS PROBABILITY, AFTER DYNAMIC SDCCH ALLOCATION,(CSF_x)
SDCCH_busy_att100*(1- --------------) %
SDCCH_seiz_att
a = p_nbsc_traffic
SDCCH ACCESS PROBABILITY, BEFORE DYNAMIC SDCCH ALLOCATION, (CSF_x)
SDCCH_busy_att
100*(1- --------------) %
SDCCH_seiz_att
a = p_nbsc_traffic
SDCCH ACCESS
Imrovement by
Dynamic SDCCH
Allocation
This is smaller
after Dynamic
SDCCH Conf.
Feature (S7) is
activated !
DYNAMIC SDCCH
RECONF ATTEMPT
/c1154 (S7)
dyn_sdcch_reconf_att
UNSUCC IMM ASSIGN
SDCCH ATTEMPT
/c1155 (S7)
unsucc_imm_ass_sdc
ch_att
Counters for
Dynamic SDCCH
Allocation
SUCCESS
UNSUCC
C ti S ( )
-
8/13/2019 BSS Formula
54/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 54
Conversation Success (area)
SDCCH successSDCCH access
TCH access TCH success
SDCCH
TCH
Cell A
TCH access TCH success
TCH Cell B
Handover
(connect_ack message)
conversation_started
dropped_call
Dropped conversation ratio
dcr_5a
sum(b.dropped_calls)
100* -------------------------------------------------- %
sum(b.conver_started) - sum(a.msc_i_tch_tch)
a = p_nbsc_ho, b = p_nbsc_service
Author: J.Neva 6/97
Version: 1.1 27.1.98
PMWG review.: 1.0 9.12.97
triggered when call started
triggered if inter BSC HO Drop call
Note: applicable on large are where
no MSC controlled Hos over areal border.
NOT applicable on BTS level.
Hi h S d Ci it S ith d D t (S7 F t )Author: J.Pekkarinen 12/97
Version:
-
8/13/2019 BSS Formula
55/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 55
High Speed Circuit Swithed Data (S7 Feature)
SDCCH
REQUESTS
/c1000
sdcch_seiz_
att
SEIZURES FOR
CALLS , LU s AND
IMSI DETACHES/c1007
sdcch_assign
MOC (incl.SMS)
/c3013
succ_seiz_orig
MTC (incl.SMS)
/c3012
??????
succ_seiz_term
One of these triggered
Version:
PMWG appr.: UNDER WORK
TCH Request
SDCCH
HSCSD TCH REQUESTS
/c1156
HSCSD TRANSP TCH REQ
/c1158
OR HSCSD REQ FOR CALLSETUP
/c1160
TCH Request
HSCSD SUCC TCH SEIZ
FOR CALL SETUP
/c1162
HSCSD SUCC TCH REQ
/c1157
HSCSD SUCC TRANSP
TCH REQ
/c1159
OR
Assignment Request message received to
the BSC from the MSC
CONVERSATION IF Call DroppedHSCSD CONNECTION
RELEASES DUE TO FAIL
/c1164
High Speed Circuit Swithed Data Intra Cell HOAuthor: J.Pekkarinen 12/97Version:
-
8/13/2019 BSS Formula
56/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 56
High Speed Circuit Swithed Data Intra Cell HO(S7 Feature)
Version:
PMWG appr.: UNDER WORK
INTRA CELL HSCSD
ATTEMPT
/c4124
SOURCE
INTRA CELL HSCSD
SUCCESS
/c4125
INTRA CELL HO SUCCESS
/c4018
INTRA CELL HSCSD SUCC DEC
/c4127
INTRA CELL HSCSD SUCC INC/c4126
IF Upgrade or Downgrade
HSCSD TCH REQ FOR HO/c1161
HSCSD SUCC TCH SEIZ
FOR HO
/c1163
High Speed Circuit Swithed Data HO Author: J.Pekkarinen 12/97Version:
-
8/13/2019 BSS Formula
57/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 57
g p(S7 Feature)
Version:
PMWG appr.: UNDER WORK
TARGET
INTER CELL INCOMING
HSCSD ATTEMPT
/c4120
INTER CELL OUTGOINGHSCSD ATTEMPT
/c4118
SOURCE
INTER CELL OUTGOING
SUCC HO
/c4014
INTER CELL OUTGOING
SUCC HSCSD HO
/c4119
INTER CELL INCOMING SUCC
HO
/c4010
INTER CELL INCOMING SUCC
HSCSD HO
/c4121
INTER CELL HSCSD SUCC DEC
/c4123
INTER CELL HSCSD SUCC INC/c4122
IF Upgrade or Downgrade
BSC Inter Cell Handover
HSCSD TCH REQ FOR HO
/c1161 HSCSD SUCC TCH SEIZ FOR
HO
/c1163
High Speed Circuit Swithed Data HOAuthor: J.Pekkarinen 12/97Version:
-
8/13/2019 BSS Formula
58/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 58
High Speed Circuit Swithed Data HO(S7 Feature)
Version:
PMWG appr.: UNDER WORK
TARGET
EXTERNAL INCOMING
HSCSD ATTEMPT
/c4114
EXTERNAL OUTGOINGHSCSD ATTEMPT
/c4112
SOURCE
EXTERNAL OUTGOING SUCC
HO
/c4004
EXTERNAL OUTGOING SUCC
HSCSD HO
/c4113
EXTERNAL INCOMING SUCC
HO
/c4000
EXTERNAL INCOMING SUCC
HSCSD HO
/c4115
EXTERNAL HSCSD SUCC DEC
/c4117
EXTERNAL HSCSD SUCC INC/c4116
IF Upgrade or Downgrade
External Handover
HSCSD TCH REQ FOR HO
/c1161
HSCSD SUCC TCH SEIZ FOR
HO
/c1163
Dynamic SDCCH allocation (S7 feature)Author: J.Pekkarinen 12/97
Version: 1.0
-
8/13/2019 BSS Formula
59/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 59
Dynamic SDCCH allocation (S7 feature)
ASSIGNMENTS
FOR CALLS,LU,SS
/c1007
sdcch_assign
PMWG appr.: 11.2.98
TCH TCH TCH TCH TCH TCHTCHTCH
SDCCH/8
TCH TCH TCH TCH TCHTCHTCH
RACH on CCCH
/c3004
ch_req_msg_rec
SDCCH
REQUESTS
/c1000
sdcch_seiz_att
Reconfiguration attempt
from TCH to SDCCH
DYNAMIC SDCCH
RECONF ATTEMPT
/c1154 (S7)
dyn_sdcch_reconf_att
UNSUCC IMM ASSIGN
SDCCH ATTEMPT
/c1155 (S7)
unsucc_imm_ass_sdcch_att
SDCCH BUSY ATTEMPT
/c1001
sdcch_busy_att
TCH TCH TCH TCH TCH TCHTCHTCH
SDCCH/8
TCH TCH TCH TCH TCHTCHTCH
When SDDCH/8 is not needed anymore it ischanged dynamically back to TCH
TCH
FAILS NONE OF COUNTER ISUPDATED !!!
FACCH Call Setup
In case of the congestion in SDCCH, one free traffic channel canbe changed dynamically to SDCCH/8
In IUO case, SDCCH/8 from the regular TRX
FACCH call setup is used only in true SDCCH congestion when
not any dynamic SDCCH more is possible to be configurated on
QualityAuthor: J.Neva 3.10.98
Version: 1.0
PMWG i 1 0 12 10 98
-
8/13/2019 BSS Formula
60/61
NOKIA Customer Services / NMO / Performance Statistics / J.Neva / F_BSS_15.PPT / 20-Jan-99 / page: 60
QualityPMWG review: 1.0. 12.10.98
UL and DL are sampled every 480ms.
Every sample is ranked to a quality class:
Class corresponds to BER:
Class BER (GSM 05.08)
***** ******************
qua 0 (BER < 0.2%)
qua 1 (BER 0.2 - 0.4%)
qua 2 (BER 0.4 - 0.8%)
qua 3 (BER 0.8 - 1.6%)
qua 4 (BER 1.6 - 3.2%)
qua 5 (BER 3.2 - 6.4%)qua 6 (BER 6.4 - 12.8%)
qua 7 (BER >12.8%)slightly
degradiated
Good
degradiated
uselessResults are available per TRX in
p_nbsc_rx_qual or p_nbsc_rx_statistics.
Impact of UL DTX:
An investigation showed that UL DTX makes UL quality to show worse.
The impact was about one 1% unit (1% of samples more in classes 6 and 7).
When investigated with field tests no real degradiation of quality could be found.
FH effect on qualityAuthor: 5/98
Version: 1.1
PMWG 1 1 1 7 98
-
8/13/2019 BSS Formula
61/61
FH effect on qualityPMWG appr.: 1.1 1.7.98
Quality classes evolution with FH
0 %
100 %
10 32 54 76
Not hopping
Hopping with 2-3 TRX/cell
Hopping with 4 or + TRX/cell
Note: TRX numbers for BB FH only. In RF FH case the TRX numbers = MA lis t lenghts.
This picture is a rough example of the trend and should not be shown to customers as
an offical statement.
Note that
- classes 0-5 do not cause audible problems
- BER is not good for measuring audio quality. FER would be better but is not available
Experiments in hopping network have shown that even if quality 5-6 share (BER) increased
FER did not, i.e. MS user perceived quality is not worse.The advantage comes in that the
speech coder works much better
under the single burst errors you
get with hopping.
With more freqs these get spaced
enough that the coding can handle
all the errors.
However, more TRXs (or frequencies)in a hopping sequence usually
means the reuse has got tighter
and soon this will start to introduce
more errors than you are saving.