BSS Formula

8/13/2019 BSS Formula

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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)


3/61


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

.

.

.

.

.

.


4/61


Availability


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.


5/61


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)


6/61


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)


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)


8/61


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


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



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


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)



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



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


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


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 ??



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


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 ??



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


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



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


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.



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


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)



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


Version: 1.0 24.10.97



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



Intra Dir Acc SUCC

/c4074

cell_sdcch_tch


Version: 1.0 24.10.97


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



Normal TCH call request handling



Direct Access in success/c4057

bsc_i_sdcch_tch


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 )


Version: 1.0 24.10.97


TCH REQUESTSFOR NEW CALL

/c1026

tch_call_req

Congestion


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



Calls and drop calls on TCH, area view


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)




Counting Erlangs (p_nbsc_res_avail) Author: J.Neva 10/98Version: 1.0


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.


22/61


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


23/61


Counting Erlangsdifferencies between dual band and 20 sec sampling methods

Author: Markku Rsnen 11/98

Version: 1.0


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


Dual Band



24/61


Traffic per codec version (S5->)


Version: 1.0

PMWG approval.: 2.12.98

V1 CODEC FTCH SEIZURES

/C1108

tch_full_seiz_speech_ver1

V2 CODEC FTCH SEIZURES (EFR)/C1109


V3 CODEC FTCH SEIZURES

/C1110


V1 CODEC FTCH FAILURES

/C1127

tch_ended_due_transc_fr_rate1


/C1128tch_ended_due_transc_fr_rate2


/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


/C1112



/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.


/C1111



/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 SEIZURES FOR DATA CALLS

Sp

eech

Data calls do not trigger codec

counters.Codec seizure counters

Version 3 is for future use.


25/61


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


26/61


Handover enabling

Disable internal HO


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)


27/61


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


28/61


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


29/61


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


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


30/61


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


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


31/61


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


Version: 1.1 5.12.97


blocking

/ c4011

bsc_i_fail_lack

connection failure

/c4012

bsc_i_fail_conn

end of HO/c4081

bsc_i_end_of_ho


/c4097 (S5)

bsc_i_unsucc_a_int_circ_type

radio chn.act.failure

/c4013

bsc_i_fail_BSS


may drop

Drop calls

/c4083

=bsc_i_drop_calls


32/61


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


Version: 1.0 23.11.96


blocking

/ 4001

msc_i_fail_lack

connection failure

/c4002

msc_i_fail_conn

end of HO

/c4080

msc_i_end_of_ho


/ c4101 (S5)

msc_controlled_in_ho

radio chn.act.failure

/c4003

msc_i_fail_BSS


may drop

HO interrupted

Author: J Neva 8/96


33/61


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


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


34/61


Handover causes

Author: J.Neva 9/96

Version: 1.1 20.5.98


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


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


DL quality /c4025

DL level /c4026


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


External TCH HO (source)

UL quality /c4023

UL level /c4024


Pbdgt /c4032

OMC (forced ho) /c4033DL quality /c4025

DL level /c4026


Pre-emption /c4085

Low distance /c4088

Distance /c4027

Umbrella /c4031

MSC invoc (traffic ho)/c4028





ERFD HO /c4111Switch circuit pool /c4099

Intra Cell SDCCH HO



DL quality /c4025


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



DL quality /c4025

DL level /c4026


Pre-emption /c4085

Low distance /c4088

Distance /c4027

Bad CI /c4089

Good CI /c4090


Pbdgt /c4032

Umbrella /c4031

MSC invoc (traffic ho)/c4028Slow moving MS /c4091




ERFD HO /c4111

Ext.SDCCH HO (source)

UL quality /c4023

UL level /c4024


Pbdgt /c4032

OMC (forced ho) /c4033DL quality /c4025

DL level /c4026


Pre-emption /c4085

Low distance /c4088

Distance /c4027

Umbrella /c4031

MSC invoc (traffic ho)/c4028





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


SDCCH to

TCH HOs

(Direct Accesses)

(Intra / Inter cell)


36/61


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)


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


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.


37/61



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


38/61


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)


9 messages per multiframe (noncombined control channel)


MFR = Number of Multiframes between Paging (2..9)


(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


39/61


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


40/61


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


Version: 0.1

PMWG approval.:



41/61


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


Version: 0.1

PMWG approval.:

AB O= Average Buffer Occupancy


42/61


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


Version: 1.1 12/98

PMWG approval.:1.1 11.2.98

Parameters:


(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) !


43/61


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


Version: 1.1 18.2.97


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


44/61


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.


45/61


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


46/61


Short Messages

MS

idle


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


47/61


Congestion & blocking

BTS

TRX

RACH


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)


48/61


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


Improvement

by Dynamic

SDCCH

Allocation (S7)


49/61


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)





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


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


good:> 98% (??)

CSF_1a

SDCCH busy att - tch seiz due sdcch con


50/61


CSF_3k

sum(a.tch_call_req-a.tch_norm_seiz)






100- 100* ---------------------------------------------------------- %

sum(a.tch_call_req)- sum(a.tch_rej_due_req_ch_a_if_crc ; Aif type mismatch or congestion




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+




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)


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)


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



51/61


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



-(b.bsc_i_unsucc_a_int_circ_type ; Aif circuit pool handover failures+b.msc_controlled_in_ho


;calls that are saved by DR

100- 100* -------------------------------------------- %

sum(a.tch_call_req)





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)


-(b.bsc_i_unsucc_a_int_circ_type ; Aif circuit pool handover failures+b.msc_controlled_in_ho


100-100* ------------------------------------- %

sum(a.tch_call_req)





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





100-100*------------------------------------------- %

sum(a.tch_call_req)- sum(a.tch_rej_due_req_ch_a_if_crc ; Aif type mismatch or congestion




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!!


52/61


Call Success Factors (area), TCH successAuthor: J.Neva 4/97

Version: 1.3


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+



- 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


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


53/61


Call Success Factors (area), SDCCHAuthor: J.Neva 6/97

Version: 1.2 12/98


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 ( )


54/61


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


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:


55/61


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


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:


56/61


High Speed Circuit Swithed Data Intra Cell HO(S7 Feature)

Version:


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:


57/61


g p(S7 Feature)

Version:


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


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:


58/61


High Speed Circuit Swithed Data HO(S7 Feature)

Version:


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


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


59/61


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


60/61


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


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.

BSS Formula

Documents