21954499 gsm kpi improvement process and guidelines 140604111529 phpapp02

7/21/2019 21954499 Gsm Kpi Improvement Process and Guidelines 140604111529 Phpapp02

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GSM KPI Improvement

Process / Guidelines



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Key Per%ormance Indicators - KPIs

SDCCH Blocking

SDCCH Drop

TCH Drop Rate

Handover Success Rate



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&ccessibility 'e%inition(all to an MS

BSC

MSC/VLR

TRC

BTS

BTS

1

2

4

5

2

2

2

3

1

4

3

5

6

)* MS(/+LR sends paging command to all ,S(sbelonging to te location area .L& 0ere MS is located

* ,S( %or0ards te paging command to all ,TSs in tatL&1 and te ,TSs in teir turn page te MS on te P(2

$* Te MS responds to te ,TS on te R&(2 and te,TS %or0ards te response to te ,S( .%or0ard to MS(

3* Te ,S(s cec4s 0it te ,TS i% it as an S'((2available and te ,TS grants te MS an S'((2 by usingte &G(2

"* Te MS and te ,TS signal on te S'((21measurement reports sent on S&((2 are %or0arded %romte ,TS to te ,S( and once te signalling is done te,S( decides 0ic T(2 to use

5* T(2 connection establised bet0een MS and ,TS

& c

c e s s

i b i l i t y



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S'((2 (ongestion 6 7vervie0

S'((2 &ctivities8

Mobility Management 6 Normal Location update

6 Periodic Registration 6 IMSI &ttac / 'etac

(onnection Management 6 (all setup

6 SMS Point to Point

6 9a: Setup

6 Supplementary Services



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(annel (on%iguration8

(annel (on%iguration can be done as %ollo0 6 (ombined ,((2/S'((2 on ) TS .S'((2/3

6 Non-(ombined ,((2 and S'((2 on TS .S'((2/;

(ell ,roadcast (annel .(,(2 – The Cell Broadcast service provides the transmission of an SMS from a

message-handling centre to all MSs in the serving area of the BTS.

– If the Cell Broadcast service is active in a cell, one signaling sub-channel is

replaced by one CBC resulting in a S!CC"#





S'((2 (annel &llocation Pro%ile .(2&P

(annel &llocation is te %eature tat selects and allocatessuitable cannels 0en one or more cannels are re<uired

(annel &llocation Pro%ile .(2&P is te parameter tatprovides di%%erent cannel allocation strategies

9or S'((2 assignments1 (2&P ; prioriti=e ne0assignments as %ollo0s8

)* 7L/S'((2

* >L/S'((2 .i% 7L/S'((2 is congested


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S'((2 'imensioning Strategy

G7S &pproac8

S'((2 sould be dimensioned %or better G7S compare to T(2* Typical

range is !*"@ - )@*

Immediate &ssignment o% T(2 0it AT(2 as last option strategyB is

recommended*

It is recommended to add S'((2 0en !*" Crlang o% signaling tra%%ic is

carried by T(2*

2al% Rate penetration1 usage o% C:tended Range cell and 2S(S' sould be

ta4en into consideration*

STS &pproac8

ccurate dimensioning is achieved by using STS cell statistics


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S'((2 (ongestion 7ptimi=ation

&naly=e te %ollo0ing issues tat could be possible reasons%or S'((2 (ongestion8

S'((2 'imensioning

Incorrect use o% S'((2 capacity %eatures suc as &daptive (on%iguration o% Logical cannels

T(2 (ongestion

Location &reas not optimi=ed

SMS usage and (ell ,roadcast cannel S'((2 &vailability


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Te %ollo0ing recommendations 0ill ave a positive impact on S'((2

congestion

Try not to use combined ,((2/S'((2 .S'((2/3

>se te optional S'((2 capacity %eatures suc as te &daptive(on%iguration o% Logical (annel %eature 0en available*

>se Immediate &ssignment on T(21 S'((2 %irst*

9or manual dimensioning1 use STS cell statistics

(on%igure one S'((2 on te ,((2 carrier and te oters on te

opping layer .Non-,((2

>se te Cricsson S'((2 'imensioning guideline*


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Te %ollo0ing issues are 0ort ta4ing into account 0enanaly=ing S'((2 (ongestion8

>se L&P' STS statistics to evaluate L&P' congestion and

optimi=e te L&P' (oncentration %actor &naly=e border cells 0it a large amount o% random

access attempts resulting in S'((2 congestion* 6 >se Random &ccess optimi=ation to solve te S'((2

congestion

Ta4e into account Timeslot priority 0en deciding 0ere tocon%igure S'((2/;


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S D C C H

( e c 4 2


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( e c 4 c


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S'((2 'rops 6 7vervie0

S'((2 'rops are classi%ied into one o% te %ollo0ing

categories8

S'((2 'rops because o% Timing &dvance S'((2 'rops because o% Lo0 Signal Strengt

S'((2 'rops because o% ,ad uality

S'((2 'rops due to 7ter Reasons


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S'((2 'rops 6 7vervie0

MSMSC BSC BTS

Channel (e2uestChannel (e2uired

3

4

Immediate ssignment (e5ect6

7 Channel ctivation

8n9

Channel ctivation c:.

Channel ctivationChannel ctivation c:.

9n

Chan. 0eg. c:.

Chan. 0eg. c:.

Immediate ssignment

;stablish IndicationSCC Conn. (e2

SCC Conn. Conf.

SBM, +

Signaling Connection Set-up

8

0

Too high TA ?

Wrong Cause Code?

6

0Too high processor load ?

Step related RA counter

Free ch. Available?

6 0 Activation of channel

successful?

6

0

Random Access

Step CMSESTAB counter


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S'((2 'rops 6 7vervie0ssignment< ssignment to Serving Cell

MSC BSC BTS

ssignment (e2uest

0

6

SBM

+;stablish Indication

ssignment Command

ssignment Complete

ssignment Compl.

Channel ctivation

=Channel ct. c:.

Channel ct. 0eg. c:.

(> Channel (elease, old channel

(> Channel (elease c:.

Possible to assign

channel?

If TCH Congestion

CNRELCONG is stepped (tie

out!"


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S'((2 'rops 6 7vervie0Connection (elease, 0ormal !isconnection

MSC BSC BTS MS

Clear Command

Channel (elease

Clear Complete

!eactivate SCC

!ISC

+(elease Indication

(> Channel (elease

(> Channel (elease c:

SCC (el.

SCC (el. c:.

Check Cause codes, if not !

successful or Call Control, step

drop call counter, CN#RO$


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S'((2 'rops 6 7vervie0Connection (elease, bnormal !isconnection

MSC BSC BTS

Clear Command

Channel (elease

Clear Com plete

!eactivate SCC

!ISC

+(elease Indication

(> Channel (elease


SCC (el.

SCC (el. c:.

Clear (e2uest Step drop call counter%

CN#RO$


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S'((2 'rop 7ptimi=ation

&naly=e te %ollo0ing issues tat could be possible reasons %or S'((2

'rops8

Lo0 signal strengt

Inter%erence

Patloss Imbalance bet0een >L/'L

2ig Timing &dvance

MS error or Subscriber beavior

T(2 (ongestion

Transmission (ongestion .L&P' (oncentration

2ard0are or Transmission %ailures


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Te %ollo0ing issues are 0ort ta4ing into account 0en analy=ing

S'((2 'rops8

S'((2 'rops and T(2 'rops o%ten drop because o% te same R9

reasons1 suc as %or e:ample insu%%icient coverage 7nly use S'((2 po0er regulation and S'((2 27 0en te net0or4

as good coverage

,S( and transmission problems can impact S'((2 drops so

investigate Transcoders1 &-inter%ace and L&P'

S'((2 'rops on te opping layer are normally so0ing 0orsevalues tan S'((2 on te ,((2

S'((2 ' 7 ti i ti


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C h e c k S

C

S'((2 ' 7 ti i ti



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B

C h e




T(2 'rop 6 7vervie0

MSC BSC BTS MS

Clear Command

Channel (elease

Clear Complete

!eactivate SCC

!ISC

+(elease Indication

(> Channel (elease


SCC- (el.

SCC- (el. c:.

,

Check Cause codes, if not !

successful or Call Control, step

drop call counter, T&N#RO$

Connection (elease, 0ormal !isconnection




T(2 'rop 6 7vervie0Connection (elease, bnormal !isconnection

MSC BSC BTS

Clear Command

Channel (elease

Clear Complete

!eactivate SCC

!ISC

+(elease Indication

(> Channel (elease


SCC- (el .

SCC- (el . c: .

Clear (e2uest"tep drop call counter,

T&N#RO$




T(2 'rop 6 'rop (all Reasons

Te T(2 'rop (all reasons as te %ollo0ing priority order8

C:cessive T& 6 T& H T&LIM cell parameter

Lo0 signal strengt in do0nlin4 and/or uplin4

6 SS>L L7ESS>L .,S( parameter 6 SS'L L7ESS'L

,ad <uality in do0nlin4 and/or uplin4 6 R:ual>LH ,&'>L .,S( parameter 6 R:ual'LH ,&''L

Sudden loss o% connection 6 None o% te above

7ter 6 Non radio-related




T(2 'rop 6 'rop (all Reasons

Te T(2 'rop (all reasons counters8

-60-0

SS do!nlink

SS uplink

-"

-0

-60

BTS sensitivit#

-

-0$

% S s e

n s i t

i v i t #

&O'SS(&

-0$

-0$

& O '

S S D & T)D*SS+,D&

T)D*SS+,(&

T)D*SS+,B&

T)D*SS(&T)D*SSB&

T)D*SSD&



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T(2 'rop parameters

RLINKT

Radio &ink Ti.e -out



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T(2 'rop parameters

RLINKT

Te MS sends measurement reports regarding te signal

strengt o% neigbor cells every 3;! ms I% te ,TS does not receive a measurement report te

RLINKT timer is decreased by )*

I% a ne0 report is received te timer is increased by *

Lea4y buc4et* Een reaces ! call is dropped



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T(2 'rop 6 7ptimi=ation

&naly=e te %ollo0ing issues tat could be possible reasons %orpoor T(2 'rop per%ormance8

6 Lo0 Signal strengt on >plin4/'o0nlin4

6 Inter%erence on >plin4/'o0nlin4

6 C:cessive T& 6 Incorrect/Not optimum Parameter settings %or e:ample po0er

regulation

6 Missing Ncells or (ongestion in Ncells

6 MS or MS ,attery problems

6 Subscriber ,eavior

6 &ntenna/2ard0are or Transmission %aults

6 Incorrect Installations



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Te %ollo0ing issues o%ten cause T(2 Sudden 'rops8

6 +ery sudden and severe drop in signal strengt1 suc as 0en

6 subscribers enter into buildings1 elevators1 par4ing garages1 etc*

6 +ery sudden and severe occurrence o% inter%erence or bad<uality*

6 MS running out o% battery during conversation*

6 2andover Lost

6 ,TS 2E %aults*

6 Syncroni=ation or &bis lin4 %ault .transmission %aults* 6 MS 9aults

T(2 'rop 7ptimi ation



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T(2 'rop 7ptimi=ation





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T(2 'rop 7ptimi=ation



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& o ! s



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Investigate T(2 'rop Per%ormance - M7TS8

MOTS_toolMOTS



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&ssignmentRe<uest IL!)5?$ )?8!383#

2andover(ommand IL!)5?$ IL!3!?) )?8!"8)"

2andover(omplete IL!3!?) )?8!"8)5

2andover(ommand IL!3!?) IL!!!"$ )?8!"8?

2andover(omplete IL!!!"$ )?8!"8?

2andover(ommand IL!!!"$ IL!3!? )?8!"8"?

2andover(omplete IL!3!? )?8!"8";

2andover(ommand IL!3!? IL!?" )?8!58$?

2andover(omplete IL!?" )?8!58$#

(learRe<uest IL!?" )?8!583#

(lear(ommand IL!?" )?8!583#

'rop .(lear Re<uest because 0rong decisionto 27 %rom IL!3!? to IL!?"*Solution8 Inibit tat 27 relation*

8 STS pegged drop in IL!?"

8 &ctual drop occured sout o% IL!3!?

StartStart

STS-'rop

STS-'rop

&ctualdrop-position

&ctual

drop-position

T(2 'rop 6 7ptimi=ationInvestigate T(2 'rop Per%ormance - RPM78



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BS*C Conusion In tis e:ample mobiles do not andover to te correct cell but to a cell 0ose %re<uency itmeasure previously*

In RPM71 tis can be seen %rom te drop table* 9or e:ample in te map a mobile traveling sout needed to andov er %rom IL!!!* to IL)!";*!*

IL)!";*! as ,((2 )$?1 and IL!3!3*$ as ,((2 is )$?* Mobile meas ured IL!3!3 previously1and tis can be seen %rom RPM7 measurement reports*

Een mobile needed to andover %rom IL!!!* to IL)!";*!1 it act ually ma4es 0rong andover toIL!3!3*$*

( 7



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Dropped Call due to Bad +ualit# &ll drops due to bad <uality >L/'L can be seen easily %rom RPM7 drop and measurement table* Te table belo0 is a e:ample o% a sort call* (all I' is "#?)31 and it lasted about 3? seconds* Ee can easily see tat RJual 'L 0as bad since te call started* In tis mar4et1 RLINK timer set to $* Tere%ore1 tere may be s ome measurement missing )5

seconds be%ore te clear command* Te table so0s several missing report bet0een starting %rom )?8 3$833 until )?8338!!*

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! "#?)3 (learRe<uest IL!!33 )?8338!!

! "#?)3 (lear(ommand IL!!33 )?8338!!

T(2 ' 7 i i i



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Dropped Call due to Bad SS Ee can see te calls dropped due to lo0 signal strengt in RPM7* 9rom measurement reports1 0e can see 0en tere is a drop due to lo0 signal strengt >L/'L1 or

bot lin4s* In te table1 i% 0e loo4 at te part be%ore te clear re<uest1 0 e can see tat RL'L .RJ level 'L1

and RL>L .RJ level >L is <uite lo0* In tis e:ample tis call d ropped due to lo0 SS RJ level botlin4s*

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#35; )53 $ (lear( ommand IL!3!;$ )?8)58!$

T(2 ' 7 ti i ti



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Dropped Call due to R&*N2 In te table 0e can see drop tat appened due to RLINK timer* In tis e:ample te call started on cell IL!!$)1 and ended in t e same cell* Te call lasted around

3" seconds* I% 0e loo4 at te last )5 seconds o% te call1 0e can see severa l missing measurement reports* I% 0e see "" or or RJual)" 0e can assume tat tese values ar e missing In tis e:ample 0e dropped te call due to lo0 signal strengt d o0nlin4

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T(2 ' 7 ti i ti



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Dropped Call due Handover Ti.er 3 T404B Tis timer e:pires )) to )3 seconds a%ter andover command sent * Een te timer e:pire1 0e can assume tat andover command tat 0as sent 0as not eard

eiter by te cell1 or by mobile* Te table so0s an e:ample o% a drop appened due to tis reason * I% 0e loo4 te time stamp

)?8!"8$1 0e can see tat 0e re<uest cannel %rom IL!3?)1 and andover 0as initiated te verysame second*

2o0ever1 about ) seconds a%ter andover command1 0e can see ta t call drop* &s 0e 4no01 tiscan not be a RLINK timer drop because it is set to $ .)5 secon ds*

c C a

l l Nr

Ev e

n t N a

. e

C el l

C el l r

Ti d

C a u

s e%

e s s

a g e

s u /

c el l

t # p e

C- a

nn el

T # p

e

? (-annel,usy IL!"$ )?8!38) ) T(2.9R/? 2andover(ommand IL$!!?) IL!"$ )?8!38)

? 2andover(omplete IL!"$ )?8!38)$ )

? (-annel,usy IL$!!?) )?8!38)# ! T(2.9R/

? 2andover (ommand IL!"$ IL$!!?) )?8!38)#

? 2andover(omplete IL$!!?) )?8!38)# !

? (-annel,usy IL!"$ )?8!38$" ) T(2.9R/

? 2andover(ommand IL$!!?) IL!"$ )?8!38$"

? 2andover(omplete IL!"$ )?8!38$5 )

? (-annel,usy IL$!!?) )?8!"8)) ! T(2.9R/

? 2andover(ommand IL!"$ IL$!!?) )?8!"8))

? 2andover(omplete IL$!!?) )?8!"8)) !

? (-annel,usy IL!"$ )?8!"8); ! T(2.9R/

? 2andover(ommand IL$!!?) IL!"$ )?8!"8);

? 2andover(omplete IL!"$ )?8!"8)# !

? (-annel ,usy IL!3?) )?8!"8$ ) T(2.9R/

? 2andover(ommand IL!"$ IL!3?) )?8!"8$

? (learRe<uest IL!"$ )?8!"8$"

R&'I7INTCR9CRCN(CMCSS&GC9&IL>RC T(2.9R/

? (lear(ommand IL!"$ )?8!"8$"

R&'I7INTCR9CRCN(CMCSS&GC9&IL>RC T(2.9R/

T(2 ' 7 ti i ti



Limited Internal NPI Training - Retainability !!"-!#-$!3)


Handover Ti.er 3 T404B

T(2 ' 7 ti i ti





Dropped Call due Handover Ti.er 3 T404B5 Tis timer usually e:pires ; to )! seconds a%ter and over co mmand re<uest* Een tis timer e:pires1 0e can assume tat te MS1 or target ce ll eard 27 command but 0e do

not ave any respond %rom tem* In te table 0e can see tat at )?8)#835 0e ave andover comman d %rom IL!3?) to IL!);$)* Ee ave clear re<uest coming in )?8)#8"3 6 ; seconds a%ter andover command

c C a

l l Nr

E v e

n t N a. e

C el

l

C el

l r

T i d

C a u

s e% e s s a g e

s u /

c el l t # p e

C- ann el T # p e

?$$ (annel,usy IL!;)$ )?8!38!3 ) S'((2

?$$ 2andover(ommand IL!3#$ IL!!3$ )?8!38$

?$$ (annel,usy IL!);$) )?8)#835 )

?$$ 2andover(ommand IL!3?) IL!);$) )?8)#835

?$$ (learRe<uest IL!3?) )?8)#8"3

R&'I7INTCR9CRCN(CMCSS&GC9&IL>RC T(2 .9R

?$$ (lear(ommand IL!3?) )?8)#8"3

R&'I7INTCR9CRCN(CMCSS&GC

9&IL>RC T(2 .9R

T(2 ' 7 ti i ti



Limited Internal NPI Training - Retainability !!"-!#-$!3$


Handover Ti.er 3 T404B5

T(2 ' 7 ti i ti





)?8$)8"! )?8$$8!!8!! 8)! 8! 8$! 83! 8"!

( e l l #

? $

( e l l 3 $ )

9R

9R

9R 9R

9R 2R

2R 9R 9R

(all set -up)?8$)8"3

(all set -up)?8$)8"3

%a6or .istake7845849

%a6or .istake7845849

&ctual drop moment)?8$8"$

&ctual drop moment)?8$8"$

(all dropped)?8$8"#

(all dropped)?8$8"#

7L>L

T(2 ' 7 ti i ti



Limited Internal NPI Training - Retainability !!"-!#-$!3"


)?8$)8"! )?8$$8!!8!! 8)! 8! 8$! 83! 8"!

( e l l #

? $

( e l l 3 $ )

9R

9R

9R 9R

9R 2R

2R 9R 9R

27+CR(NT27+CRS>(

27+CR(NT27+CRS>(

27+CR(NT27RTT7(2

27+CR(NT27+CRS>(

27&T9R2R&MR27S>(9R2R&MR

27&&T7L27S>(7L

27&T2R9R&MR

T2N'R7PS>,

T9(&SS&LLT9MSCST,

T9MSCST,OS>,

T9MSCST,

T9MSCST,

T9(&LLST9+$(&LLST&SS&LLT(&SS&LL

T9(&LLST9+$(&LLST9(&LLST9+$(&LLS

T9(&LLS O S>,T9+$(&LLSOS>,.T9+(&LLSOS>,T9+)(&LLSOS>,T9(7NGS27OS>,D

T9(&LLS O S>,T9+$(&LLSOS>,T9MCST&, .depD

T2MSCST,

T2+$(&LLST2(&LLS are notstepped

T2MSCST,

T2+$(&LLST2(&LLS are notstepped

T2MCST&,OS>,T2(&LLS O S>,T2+$(&LLSOS>,

T9(&LLS O S>,T9+$(&LLSOS>,.T9+(&LLSOS>,T9+)(&LLSOS>,T9(7NGS27OS>,D

T9(&LLST9+$(&LLST9(&LLST9+$(&LLS





Investigate T(2 'rop Per%ormance - 'IP

DIP



Limited Internal NPI Training - Retainability !!"-!#-$!3?

2andover - 7vervie0

Te %undamental concept o% mobile communications is temobility1 0ere te person using te pone moves aroundbeing anded over bet0een cells

2&N'7+CR is te process tat ensures tat te user is

placed on te best server and tat te %ollo0ing re<uirements%or mobile communications are %ul%illed8

6 (overage8 to provide a connection 0it su%%icient signal strengt

6 Speec uality8 to avoid disturbances

6 (apacity8 to even out te tra%%ic load

L7(&TING Is te so%t0are algoritm tat determines2andover 'ecisions



Limited Internal NPI Training - Retainability !!"-!#-$!3;

2andover - 7vervie0

, ( ( 2 S &

( ( 2

, S I ( 1 S S M e a s u

r e R e p o

r t)

9 & ( ( 2 9 & ( ( 2

2 7

& c c e s s 2 7 ( o m m

a n d

2 7 '

e t e c t

9 & ( ( 2

2 7 ( o m

p l e t e

$

I% all signaling goes 0ell1 call is

establised on target cell and old

cannel is released*

9 & ( ( 2 2 7

( o m m a

n d$

Mobile as moved too %ar a0ay

%rom serving site

9&((2 cant reac .(/I-0ise

Drop:

$r



Limited Internal NPI Training - Retainability !!"-!#-$!3#

2andover 6 Locating 7vervie0

Locating ,asic 2andover

(andidate list

Signalstrength above

SUFFICIENTlevel?

Moreneighbors?

Penalty evaluation

Signalstrength aboveSUFFICIENT

level includingTROFFSET and

TRHYST?

Wait untilranking of

neighbor cellis done

L-cells

K-cells

Rank n according to

L-criterion includingLOFFSET and LHYST

L-cells

K-cells

Minimum levelcriterion fulfilled?

Rank n according to K-

criterion includingKOFFSET and KHYST

Discard nNo

Yes

Yes No

For serving cell s

For all reported neighbor cells n

Yes

No

No

Yes

Serving cellis L-cell

Serving cellis K-cell

Best neighbor used for serving

cell sufficient condition



Limited Internal NPI Training - Retainability !!"-!#-$!"!


Locating Types o% cell

borders

L-L border

transition border .K-L border

e<ual L

e<ual K

e%%ective su%%icient level

%rom & to ,

transition border .K-L border

&,

e%%ective su%%icient level

%rom , to &

K-K border



Limited Internal NPI Training - Retainability !!"-!#-$!")


Locating 6 ,asic Ran4ing8 Cricsson $

Te %irst tree stages o% te algoritm are per%ormed

in e:actly te same 0ay as Cricsson )1 but Cricsson

$ ta4es only te signal strengt in account8)* (orrection o% te ,TS output po0er %or do0nlin4

measurements

* Cvaluation o% te Minimum Signal Strengt condition

$* Subtraction o% te signal strengt penalties

3* Signal Strengt Cvaluation

"* (ombination into a basic ran4ing list sorted by a

descending order o% SS





Locating 6 ,asic Ran4ing8 Cricsson $

R A N Ks = S S _ D O W Ns

R A N Kn = p _ S S _ D O W Nn - O F F S E Ts ,n- H Y S Ts ,n

w h e r e

H Y S T = H IH Y S T if rx le vn ≥ H Y S T S E P

H Y S T = L O H Y S T if rx le vn < H Y S T S E P



Limited Internal NPI Training - Retainability !!"-!#-$!"$


Locating 6 &u:iliary Radio Net0or4 %unctions evaluation

Penalty list

Measurementresults

Organizing the list

Urgency condition

Auxiliary radionetwork functions

evaluations

Allocation reply

Basic ranking

Filtering

Initiations

Sending the list

Six auxiliary radio network functions areincorporated in the locating software:

• Assignment to another cell

• Hierarchical cell structures

• Overlaid and underlaid subcells• Intra-cell handover

• Extended range

• Cell load sharing

7



Limited Internal NPI Training - Retainability !!"-!#-$!"3


Locating 6 &u:iliaryRadio Net0or4

%unctions evaluation

2 d L i 7 i



Limited Internal NPI Training - Retainability !!"-!#-$!""


Locating 6 &u:iliary Radio Net0or4 %unctions evaluation

(ategori=ation )8 Te candidates in te ran4ing list are

divided into categories* Te signal strengt is used to

set te categories %or te neigboring cells* Tee:isting categories are8

6 ,etter cell8 (ell 0it a iger ran4ing value tan

serving cell in te candidate list*

6 Eorse cell8 (ell 0it a lo0er ran4ing value tan

serving cell in te candidate list*

6 Serving cell8 Te cell serving te connection*

Tese categories are later used in evaluations and

selection o% cause values

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition

Auxiliaryradionetworkfunctionsevaluations

Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

2 d L ti 7 i



Limited Internal NPI Training - Retainability !!"-!#-$!"5


Locating 6 (ell Load Saring Cvaluation

Te cell load saring evaluation is per%ormeda%ter te normal ran4ing procedure* Teevaluation is only per%ormed i%

6 cell load saring is active %or te cell 6 i% no urgency conditions apply and 6 i% te cannel is a T(2 0ere te cannel mode

is Qspeec/dataB

& cannel in a multislot con%iguration is notevaluated* 9urter1 no evaluation isper%ormed at re<uest o% a candidate list %orassignment*

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

2 d L ti 7 i



Limited Internal NPI Training - Retainability !!"-!#-$!"?


Locating 6 (ell Load Saring Cvaluation

7nly candidates tat %ul%ill te %ollo0ing

conditions are involved in te evaluation8 6 Te candidate is ran4ed Eorse

6 Te candidate is Internal

6 It e:ists in te same cell layer as serving cell

6 It accepts andover due to cell load saring

Te evaluation is ten per%ormed as a ne0ran4ing 0it reduced ysteresis areas

bet0een serving cell and te neigboring

cells*

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

2 d L ti 7 i



Limited Internal NPI Training - Retainability !!"-!#-$!";


Locating 6 7verlaid/>nderlaid Cvaluation

Te evaluation is only per%ormed i% te

serving cell as an overlaid and underlaidsubcell structure*

&n evaluation is per%ormed to determine i% a

subcell cange .overlaid to underlaid or

underlaid to overlaid is desired* Te criterion is based on te do0nlin4 signal

strengt1 timing advance measurements %rom

te serving cell and te tra%%ic load in te cell*

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

2 d L ti 7 i



Limited Internal NPI Training - Retainability !!"-!#-$!"#


Locating 6 7verlaid/>nderlaid Cvaluation

I% te serving cell is co-sited 0it a neigboring cell tat

as a subcell structure1 ten locating evaluates i% te

andover sall be proposed to te overlaid orunderlaid neigboring subcell*

I% te MS is located in te overlaid subcell and a bad

<uality urgency occurs1 Locating proposes a subcell

cange %rom overlaid to underlaid subcell to prevent

te MS %rom remaining on connections 0it bad<uality*

& timer is used to prevent an immediate return bac4 to

te overlaid subcell*

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

2 d L ti 7 i



Limited Internal NPI Training - Retainability !!"-!#-$!5!


Locating 6 Intracell 2andover Cvaluation

Te Intracell 2andover evaluation is not

per%ormed at assignment and oter0ise onlyper%ormed i% intracell andover is allo0ed %or

te current subcell*

Te criterion %or determining i% an intracell

andover is desired is based on uplin4 anddo0nlin4 <uality and signal strengt

measurements %rom te serving cell*

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

2 d L ti 7 i



Limited Internal NPI Training - Retainability !!"-!#-$!5)


Locating 6 Intracell 2andover Cvaluation

Te criterion is %ul%illed 0en te <uality is 0orse tan

could be e:pected %rom te signal strengt level* Tere

are parameters to prevent too many consecutiveintracell andovers in a se<uence during a connection*

I% te MS is located in te overlaid subcell and te

number o% allo0ed consecutive intracell andovers

ave been e:ecuted ten Locating proposes a subcell

cange %rom overlaid to underlaid subcell to preventte MS %rom remaining on connections 0it bad

<uality*

& timer is used to prevent an immediate return bac4 to

te overlaid subcell*

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

2 d L ti 7 i





Locating 6 &ssignment to 7ter (ell

Te normal Locating is used in order to %ind te most

suitable cell at te call setup

I% a better cell tan te serving cell is %ound during tecall setup signaling1 tat cell 0ill be te %irst one in te

Locating candidate list* Tis is called &ssignment to a

better cell*

&lso 0orse cells can be %ound1 and at congestion in te

serving cell or in te better cell1 te call can be setup ina 0orse cell* Tis is called &ssignment to a 0orse cell*

2o0ever1 cells at a large distance %rom te nominal

cell are not allo0ed to remain as candidates* Tis is

controlled by te parameter &E799SCT*

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

2 d L ti 7 i



Limited Internal NPI Training - Retainability !!"-!#-$!5$


Locating 6 2ierarcical (ell Structures

Te 2(S %eature provides te possibility to give priorityto cells tat are not te strongest but provide su%%icientsignal strengt levels

Te appropriate level o% te su%%icient signal strengt

levels mainly depends on te co- and adacentinter%erence %rom te surrounding cells

Eit lo0 inter%erence it is te noise level 0it a sa%etymargin tat set te su%%icient signal strengt levels

Cac cell sould be associated 0it a L&CR

Te Layer could be de%ined by te tra%%ic tat te cellcaptures 0it ust a basic ran4ing1 o0 muc tra%%ic tecell are dimensioned %or and o0 muc te cellinter%ere 0it te rest o% te net0or4

Te lo0er te layer te iger te priority

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

2 d L ti 7 i





Locating 6 Removal o% candidates

Te reasons %or removal o% candidates %rom te

list are8

Te candidate belongs to a system type not

supported by te mobile*

Cvaluation o% ,S( parameters and timers

controlling andover1 i*e* i% it is allo0ed toma4e andover on S'((2 etc* Te

evaluated parameters are I,27SI(21 S(271

&SS7(1 I,27&SS1 T&LL7( and T>RGCN*

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

2 d L ti 7 i



Limited Internal NPI Training - Retainability !!"-!#-$!5"


Locating 6 Removal o% candidates

Te reasons %or removal o% candidates %rom te list are8

Cvaluation o% co-sited neigbors* Tree cec4s are

per%ormed8 6 I% average timing advance e:ceeds te M&JT& value%or te co-sited cell*

6 I% average timing advance is less tan te T&LIM value%or serving cell and greater tan or e<ual to te T&LIMvalue %or te co-sited cell*

6 I% te cell is 0orse and in te same cell layer as serving

cell and te average timing advance e:ceeds teT&LIM value %or te co-sited cell*

Cvaluation and removal o% candidates i% te MS isclassi%ied as a %ast moving mobile .i% tis %eature isused*

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

2ando er Locating 7 er ie





Locating 6 (ategori=ation

Te cells in te candidate list are ten

organi=ed in te %ollo0ing tree categories8 6 &bove S8 Neigboring cell above serving cell in

te candidate list

6 ,elo0 S8 Neigboring cell belo0 serving cell in

te candidate list

6 S8 Serving cell

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

2andover Locating 7vervie0



Limited Internal NPI Training - Retainability !!"-!#-$!5?


Locating 6 7rdering te candidate list

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

*ndication Description

) &ssignment Re<uest &rrived

&E state

$ C:cessive T& urgencydetected

3 ,ad uality urgency detected

" 7L/>L subcell cange or I(27re<uested




Limited Internal NPI Training - Retainability !!"-!#-$!5;

2andover 6 Locating 7vervie0Locating 6 List preparation

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist

Penaltylist

Measurementresults

Organizingthelist

Urgencycondition


Allocationreply

Basicranking

Filtering

Initiations

Sendingthelist




Limited Internal NPI Training - Retainability !!"-!#-$!5#


Locating 6 Sending te list

Penal ty l ist

Measurement

resul ts

Organizing the l ist

Urgency condi tion

Auxi l iary radionetwork functions

evaluations

Al location reply

Basic ranking

Filtering

Initiations

Sending the l ist

• I f the candidate list is em pty (i.e. serving cel l is

the best) the can didate l ist is no t sent to thecentral processor.

• The f irst cell in the candidate lis t is the “best”can didate. At congestion the ne xt cel l in the

cand ida te l ist is tried .




Limited Internal NPI Training - Retainability !!"-!#-$!?!


Locating 6 &llocation reply

• A t s u c c e s s a p e n a lty l is t is t ra n s fe rre d f ro m th elo c a tin g in d i v id u a l to th e n e w o n e . If th e h a n d o v e r

re a s o n w a s d u e t o u r g e n c y a p e n a lty fo r th ea b a n d o n e d c e ll m u s t b e in c lu d e d . T h e o ldloc a t ing ind iv idu a l is t he n de le ted .

• A t in te r -B S C h a n d o v e r it is n o t p o s s ib le to s e n d

the pe na lty l is t . H ow ev e r it is p os s ib le ind ica te ifth e c a u s e o f th e h a n d o v e r w a s d u e to b a d q u a l ityo r e x c e s s iv e t im in g a d v a n c e . Th e p e n a lt ie s o f th en e w c e l l w ill th e n b e u s e d . (EX T P EN= O N )

Pena l ty l i s t

M e a s u r e m e n tresu l t s

Organ iz ing the l i s t

Urgency cond i t ion

Aux i l ia r y rad ione twork func t ions

eva lua t ions

A l loca t ion rep ly

Bas ic rank ing

F i l te r ing

In i t ia t ions

Send ing the l i s t




Limited Internal NPI Training - Retainability !!"-!#-$!?)


Locating 6 &llocation reply a n s f e r r e

o n e . I fp e n a l t y

u d e d . T h l e t e d .

o t p o s s i p o s s i b l

a s d u e t . T h e p e

P e n a l t y l i s t

M e a s u r e m e n t

r e s u l t s

O r g a n i z i n g t h e l i s t

U r g e n c y c o n d i t i o n

A u x i l i a r y r a d i on e t w o r k f u n c t io n s

e v a l u a t i o n s

A l l o c a t i o n r e p l y

B a s i c r a n k i n g

F i l t e r i n g

I n i t ia t i o n s

S e n d i n g t h e l i s t

•A t c o n g e s t io n i n a l l t h e c a n d id a t e s in t h e l i s t a

w i l l b e m a d e a f t e r a c e r t a i n t im e s p e c i f ie d b y t h

T A L L O Co rT U R G E N.

T A L L O C( a t n o r m a l h a n d o v e r s ) i n h ib it s r a n k in g u

u r g e n c y c o n d i t i o n s f o u n d .

T U R G E N( a t u r g e n c y h a n d o v e r s ) i n h ib i t s s e n d in g

l i s t u n le s s a b e t t e r c e l l i s f o u n d .

2andover Neigbor (ells



Limited Internal NPI Training - Retainability !!"-!#-$!?

2andover 6 Neigbor (ells

Neigbor cells .N(CLLS impacts te %ollo0ing radio net0or4areas8

2andover Per%ormance

T(2 'rops

(overage

Inter%erence

9re<uency plan




Limited Internal NPI Training - Retainability !!"-!#-$!?$


7ptimi=ation o% N(CLLS mainly consists o% te %ollo0ingactivities8

9ind and &dd missing N(CLLS

9ind and Remove unnecessary or 0rong N(CLLS

7ptimi=e Neigbor cell ,((2 %re<uencies and ,SI(s




Limited Internal NPI Training - Retainability !!"-!#-$!?3


7ptimi=ation o% N(CLLS are done using te %ollo0ingin%ormation8

Map in%ormation 6 Site location and terrain

Predicted coverage

STS 2andover statistics

MRR - Signal strengt and Timing &dvance .T&

N(S and N7J %rom RN7



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Neigboring (ell Support .N(S

N(S initiates te &ctive ,&-list Recording .,&R in ,S(

Te ,&R modi%y te selected cell ,&-list1 to include test

%re<uencies*

MS measures te de%ined %re<uencies in its neigbor list O

test %re<uencies

Result are recorded in N(S and presented in several report

%ormats*




Limited Internal NPI Training - Retainability !!"-!#-$!??






Limited Internal NPI Training - Retainability !!"-!#-$!?;






Limited Internal NPI Training - Retainability !!"-!#-$!?#


&dding Neigbor cells using N(S




Limited Internal NPI Training - Retainability !!"-!#-$!;!



7vervie0 report used to decide 0ic cells to investigate




Limited Internal NPI Training - Retainability !!"-!#-$!;)






Limited Internal NPI Training - Retainability !!"-!#-$!;






Limited Internal NPI Training - Retainability !!"-!#-$!;$






Limited Internal NPI Training - Retainability !!"-!#-$!;3



Missing relationsip




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STS used to evaluate result o% N(CLL add

O(T*NCE&& D,TE 1ER*OD 1ER&EN E;CH*D HO<ERCNT H=S(C

L!)!",-L!))$, !!))3 )!!!-)#!! "3! ),S(3 3$#*!! #;*);

L!))$,-L!)!", !!))3 )!!!-)#!! "3! ),S(3 3!#*!! ##*!




Limited Internal NPI Training - Retainability !!"-!#-$!;5



N((PCRM parameter

N((PCRM de%ines te allo0ed N((s .Net0or4 (olor(ode on te ,((2 carriers %or 0ic te MS is permitted

to send measurement reports* To capture interactions 0it

oter cells .suc as 0it N(S1 I('M etc*1 all !FF? sould

be used

2andover 6 7ptimi=ation



Limited Internal NPI Training - Retainability !!"-!#-$!;?

2andover 7ptimi=ation

&naly=e te %ollo0ing issues tat could be possible reasons %orpoor 2andover Per%ormance8

6 (overage

6 Inter%erence

6 Incorrect parameter settings

6 >nnecessary or Missing N(CLL relations

6 2ard0are or Lin4/Transmission 9aults

6 Missing 9re<uencies in te Measurement list

6 Poor Inter MS(/,S( andover per%ormance

6 T(2 (ongestion




Limited Internal NPI Training - Retainability !!"-!#-$!;;

( n s u c c

( -p




Limited Internal NPI Training - Retainability !!"-!#-$!;#

C

' e l a y e

d e c i




Limited Internal NPI Training - Retainability !!"-!#-$!#!

I s t e




Limited Internal NPI Training - Retainability !!"-!#-$!#)

2andover 7ptimi=ation2andovers - (ongestion

2op

,((2

(orrect ,eavior

2op

,((2

(ongestion )

2op

,((2

(ongestion

2op

,((2

(ongestion $ No 27V

(ongestion 'rop




Limited Internal NPI Training - Retainability !!"-!#-$!#

2andover 7ptimi=ation2andover 6 (o ,((2 F ,SI( N(CLLS

!)?5) F !)?;$ 6 (o-(annel1 (o-,SI( .5#3-5




Limited Internal NPI Training - Retainability !!"-!#-$!#$

2andover 7ptimi=ation2andover 6 ,SI( (on%usion

,((28 ";;

,SI(8 $3

,((28 ";;,SI(8 3?

,((28 ";!

,SI(8 $!

,((28 ";5

,SI(8 )$

,((28 ";5

,SI(8 )




Limited Internal NPI Training - Retainability !!"-!#-$!#3


2andover 6 ,SI( (on%usion

Te ,((2 sould be planned so tat ,SI(-decoding is

possible

&void ,SI(-con%usion 6 Mobiles only ave to decode ,SI(

every )! seconds

Eit tigt ,((2 re-use .) cannels te %ocus o% te

,((2 planning sould be on andover per%ormance




Limited Internal NPI Training - Retainability !!"-!#-$!#"



Outgoing HO ailures

increased on te 40t




Limited Internal NPI Training - Retainability !!"-!#-$!#5

Co Channel

andover >ailure Bet/een

0D83 and 0D8)3EC.



N>"5, and N>"$5B are Co-BCCH causing BS*C

Conusion or te .o/iles co.ing ro. N>"059C to

N>"5, causing a ig percentage o HO lost

21954499 gsm kpi improvement process and guidelines 140604111529 phpapp02

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