Iratpresentationreviratbclaro 150806175300 Lva1 App6891 (1)

8/15/2019 Iratpresentationreviratbclaro 150806175300 Lva1 App6891 (1)

1/33

IRAT(U2G and G2U)


2/33


3/33

"#M$ and GSM are to be seen as complementar% s%stems& 'ere GSM

contributes 'it a 'ell built-out coerage& and "#M$ adds ne' serices andiger bit-rates* Inter-'or+ing bet'een tese s%stems enables subscribers 'it

I,$ capable terminals to reac "#M$ serices on "#M$ 'ile using GSM

as a fallbac+ access tecnolog% outside "#M$ coerage*

e I,$ andoer and cell reselection bet'een "#M$ .->GSM& reduces te

number of dropped connections 'ere "#M$ coerage is limited& border cellsof te "#M$ coerage or larger coerage oles inside te "#M$ s%stem*

osts associated 'it I,$/

0 ompressed Mode (iger po'er usage or decreased ac+et data trougput)*

0 Increased drop ris+ 'it unnecessar% startstops of compressed mode*

"it careful introduction of I,$ in te s%stem te oerall gain 'it I,$

andoer is beneficial for te s%stem performance*

IRAT (U2G and G2U)


4/33

IRAT (U2G and G2U)

e I,$ function enables te operator to distribute te traffic bet'een te GSM

and te "#M$ s%stems& according to a pre-determined strateg%*

e strategies described ere are diided into tree parts/0 Idle mode&0 onnected mode for S serices&0 S serices

U& STAT&S A$, TRA$SITIO$S OR IRAT


5/33

I,.& %O,& STRAT&G/

$ subscriber 'ill camp and set up a call 'en bot s%stems (GSM or"#M$) are aailable*

Idle mode parameter settings also steers te S traffic beaior in te

44_5$6 state in "#M$*


6/33

$ proper setting of te idle mode parameters 'ill reduce te number of

unnecessar% I,$ andoers and cell reselections and is te foundation for a

good 'or+ing inter-'or+ing s%stem bet'een 2G and 3G*

e main strateg%/

Ma+ing subscribers camp in "#M$ 'eneer "#M$ coerage is aailable

>> full adantage of te initial "#M$ coerage and its ne' serices (e7/ ideo

call)*

I,.& %O,& STRAT&G/


7/33

$ 8 in Idle mode or in C&..0ACH or URA0!CH 'ill start to measure GSMneigbors/

1) Sering cell I6 c!o is less or e9ual to te tresolds belo'/

:9ualmeas ; 1ual%in < sRatSearc ; -1= < ; -1 d?

- sRatSearc4 I6 c!@ (#efault/ d?)- 1ual%in4 Min* re9uired 9ualit% for selection criteria in te cell (SI?3 for te

sering cell and SI?11 for adAacent cells)

OR2) Sering cell I6 ,S is less or e9ual to te tresolds belo'/

:r7lemeas ; 1R5.ev%in < sHcsRat ; -11B < 3 ; -112 d?m- sHcsRat4 #efined per cell (8 support for ,13@ on 3G S 2B*3@ ,el B is

needed in order to trigger on tis parameter)C o disable tis trigger/ s6cs,at ;

-1@B d?

- 1R5.ev%in4 Min* re9uired signal strengt for cell selection criteria in te cell*

I,.& %O,& STRAT&G/(U2G)


8/33

"en measurements are started& te GSM cells are included in te cellran+ing* e cells are ran+ed according to te R criteria& comparing signal

strengt/

,(sering) ; :meas(s) < 1H6st(s) (d?)

,(neigbor) ; :meas(n) - 1O77set'(s&n)

If a GSM cell is ran+ed as te strongest cell troug te , criteria during

treSelection& an I,$ cell reselection to GSM ta+es place*

e setting of 1O77set'sn ; D d? for GSM neigbors aims at ma+ing te

RSCP signals from "#M$ cells and te RSSI signals from te GSM cells

comparable in te ran+ing procedure*

I,.& %O,& STRAT&G/(U2G)


9/33

"en te 8 is camping in GSM& te decision 'en to start measurements on

"#M$ is based on parameter SI*

SI ; D/ Al8a6s ma+e measurements on te "#M$ s%stem (recomended in

most cases) E o be used for laro

SI ; 1B/ $ot to measure on "#M$ and prolong 8 standb% time (If no

"#M$ coerage e7ists)

SI ; =-1/ Ma+e measurements on "#M$ 'en GSM signal strengt ,SSI is

a#ove a certain tresold

SI ; @-F/ / Ma+e measurements on "#M$ 'en GSM signal strengt ,SSI is

#elo8 a certain tresold*

I,.& %O,& STRAT&G/(G2U)


10/33

If te follo'ing criterias are fulfilled a Multi-,$ capable MS 'ill reselect a suitable"#M$ cell (criteria must be fulfilled for B seconds)/

1) I6 c!o > ,,%I$ (,ecommended ; -12d?)0 5##:MI! > 9:ualMin < s,atSearc (82G criteria/ #ef* -1d?) can preent te

8 for ma+ing cell reselection to a 'ea+ 9ualit% "#M$ cell& and to preent too

earl% cell reselection measurements on GSM*0 $n increase of 5##:MI! 'ill ma+e te 8 camp longer in GSM before selecting

"#M$ in idle mode and sta% longer in GSM pac+et transfer mode*

And2) I6 RSCP > ,4$(s


11/33

e parameter ,,RSC!%I$ is a RSCP tresold parameter tat is usedin feature Com#ined Cell Reselection Tri::erin: to ;C,%A* is

parameter tresold can also be used in te cell reselection criteria*

If te combined c!o and ,S criteria*s are fulfilled a Multi-,$ capable

MS 'ill reselect a suitable "#M$ cell (criteria must be fulfilled for B

seconds)/

I6 RSCP > ,4$(s ,,%I$ (-'2d ,,RSC!%I$ (-'*2d


12/33

GS% to U%TS (G2U) !arameter &ntit61) Startstop measurements :SI al'a%s& neer or ,SSI

2) ,S ealuation 5##:MI! c!o

and 5##:55 ,S s ,SSI omparsion

U%TS to GS% (U2G) !arameter &ntit6

1) Startstop measurements s,atSearc c!o

or

s6cs,at ,S

2) ,S ealuation cell ran+ing ,S s* ,SSI omparsion

(9ffset1Sn)

e 8 measures and ma+es te decision 'en to transfer

S/ (8 support for

,13@ on 3G S2B*3@ ,el B is needed in

order to trigger on ,S)

I,.& %O,& STRAT&G/Inter-RAT Cell reselection


13/33


14/33

Connected mode 7or CS services Strate:6(IRAT HO)

S connected mode strateg% concerns te criteria for canging of s%stem'en in connected mode (speec calls)* is strateg% is supported b%

connected mode parameters& Serice ?ased 6andoer to GSM and te

#irected retr% to GSM function for speec serice*


15/33

Strateg%/ $oid an% unnecessar% start of compressed mode usagein areas 'ere te call can be +ept in "#M$ for te maAor part of

te cell& J;C,%A as 7ar as possi#le=>

e I,$ andoer sould in te ideal case be used to sae ongoingcalls 'en te "#M$ coerage is getting poor and 'ere tere is

GSM coerage to continue te call*

In te s%stem te I,$ andoer function for connected mode can

#e turned OnO77 on a cell level& using te parameter oT6pe

(GSM_,5,,#& I5_,5,,# or !!)*

Connected mode 7or CS services Strate:6IRAT HO (U2G)


16/33

ere are tree cases/

0 If all cells in te $S ae oT6pe (or de7aultHoT6pe) set to K!!K >>

no I5 or GSM 6 attempts sall be done and no GSM or I5

measurements sall be started*

0 If at least one cell in te $S as oT6pe (or de7aultHoT6pe) set toKGSM_,5,,#K and no cell in te $S as oT6pe (or

de7aultHoT6pe) set to KI5_,5,,#K >> preferred 6 t%pe is GSM*

0 If at least one cell in te $S as oT6pe (or de7aultHoT6pe) set

to KI5_,5,,#K >> preferred 6 t%pe is I5* 5or more info onI56*

e actiation of I,$ b% oT6pe and de7aultHoT6pe sould also be

used to minimiLe GSM measurements and I,$ andoer in te net'or+*



17/33

Strate:64 ;C,%A as 7ar as possi#le as long as te 9ualit% or signalleel is aboe a certain leel*

"en te 8 moes into an area 'it deteriorating radio conditions/ >>

start measurements on GSM fre9uencies using compressed mode*

e andoer ealuation criteria are/

0 Start o7 compresssed mode measurements4

i7 an% of tese conditions fulfilled for #est AS cell

C!ICH Ec No ? event 2d &c$o tresold ,

C!ICH RSCP ? event 2d RSC! tresold ,

UeTxPower reaces ma5 T5 !o8er event @d

0 Stop o7 compressed mode measurements4

i7 all conditions belo' fulfilled for #est AS cell

C!ICH Ec No event 27 &c$o tresold $!#

C!ICH RSCP event 27 RSC! tresold $!#

UeTxPower ? event @# tresold



18/33

Tri::er o7 IRAT andover attempt4

i7 I6 Ec/No 2d eent triggered M (compressed mode)

GSM RSSI 'it ?SI erified > :smTres3a and

I6 Ec/No . eent 3a c!o tresold

i7 I6 RSCP 2d eent triggered M (compressed mode)

GSM RSSI 'it ?SI erified > :smTres3a and

I6 RSCP . eent 3a ,S tresold

i7 8e Tx power eent Fd triggered M (compressed mode)

GSM RSSI 'it ?SI erified > :smTres3a andI6 RSCP . eent 3a 8 7 o'er 2 tresold

e strateg% is implemented b% setting te lo'est possible parameter

alues 'itout causing te connections to drop prior to a andoer*



19/33

Connected mode 7or CS services Strate:6U2G HO tri::ered #6 RSC!


20/33

"en te 8 is in te GSM connected mode& tere are t'o differentstrategies 'en to andoer to te "#M$ s%stem* e strateg% is

determined b% te parameters ISHO.&& %RS. and SC*

0 SC specifies 'en "#M$ measurements sould be started*0 ISHO.& (percentage of idle 6 time slots) specifies te load leel in

GSM tat as to be fulfilled before a andoer is initiated*0 %RS. is an c!o tresold for te measured I6*

e setting of %RS. is some'at depending on 'at "#M$ triggering

criterion tat is cosen for eent 2d and 3a*

$ sufficient ig leel on %RS. preents ping-pong beaior& and te 8'ill aoid getting into compressed mode immediatel% after being anded

oer to "#M$*

Connected mode 7or CS services Strate:6IRAT (G2U)


21/33

Strate:6 ' 4 Handover 8en ;C,%A 1ualit6 is 7ul7illed> is call is+ept in "#M$ as long as possible*

SC ; D/ al'a%s perform "#M$ measurements te settingC

ISHO.& ; / Initiate a andoer re9uest 'en te measured "#M$9ualit% leel is aboe 9ualit% parameter %RS. regardless of te load in

te GSM s%stem*

ISHO.& 9 2@/ Initiate andoer 'en te load in GSM is aboe =@N

(tat is& idle cannels are less tan 2@N)*

%RS. is te c!o tresold for te measured I6



22/33

Strate:6 24 Terminate te call in GS% B To #e used in Claro>

is strateg% aims at +eeping te call in GSM until te call is terminated&

and ten let idle mode beaior control in 'ic s%stem te 8 camps*

e number of I,$ andoers during a call is minimiLed* is 'ill

minimiLe ping-pong I,$ andoers*

SC ; 1B/ disable G28 6

ISHO.& ; @/ neer initiate a "#M$ andoer re9uest in connected

mode unless te load in te GSM s%stem is 1@@N& irrespectie of te

alue of %RS. (tis strateg% does not consider parameter %RS.)>

$fter te call as been terminated& te mobile is guided b% te idle mode

parameter setting and camping beaior to select te s%stem in 'ic to

camp*



23/33

GS% to U%TS (G2U) !arameter &ntit6

Start measurements :S al'a%s& neer or ,SSI

6 trigger M,S4 c!o

IS64V GSM load N

U%TS to GS% (U2G) !arameter &ntit6

Start M measurements 2d or Fd c!o or ,S

Stop M measurements 2f and Fb c!o and ,S

6 trigger 3a c!o or ,S and

:smTres3a ,SSI

e 8 measures& but te s%stem decides 'en to transfer

Connected mode 7or CS services Strate:6Inter-RAT Handover


24/33

S connected mode strateg% in "#M$ is supported b% a

combination of S connected mode and idle mode parameter

settings& depending on 'ic S state 44_#6 (dedicated) or

44_5$6 (common) te 8 is in* In GSM& te idle mode

parameters 'ill steer te S connected mode user*

"en te user is on 44_#6 (6S)& so#c transition can& if

poor 9ualit% detected is enabled& trigger te 6S user to a44_#6 (dedicated) and enable I,$ transition*

!S Services Strate:6


25/33

e I,$ radio net'or+ parameters in "#M$ and GSM ae a

clear impact on te cell cangecell reselection decision 'en te 8

is transferred bet'een te radio accesses tecnologies*

e I,$ radio net'or+ parameters ae er% limited to no impact on

te outage time follo'ing an I,$ cell cange or cell reselection for a

S data connection* is outage time is dependent on te

application used& te used 8 and o' te net'or+ is configured*

In "#M$& a S user can be on eiter dedicated cannel

44_#6 (,) or on a common cannel 44_5$6& 8,$_6to be subAect for I,$ transition attempt*

!S Services Strate:6IRAT C&.. CHA$G& C&.. R&S&.&CTIO$


26/33

;C,%A to GS% in C&..0,CH (R)

e "#M$ state decides 'ic set of parameters tat are alid in

tis direction* In te 44_#6 (,) state te connected mode

parameters are used and cell cange is performed*

e most important strategic decision to be made for 82G cell

cange for S traffic is 'eter or not to enable te function for cell

cange from "#M$ to GSM* ricsson recommends tat a poor

radio enironment sall be andled b% do'n-s'itces to a F +bits

radio bearer*

ereafter& if te "#M$ radio conditions continue to deteriorate& an

I,$ cell cange oer to GSM sall ta+e place*

!S Services Strate:6IRAT C&.. CHA$G& C&.. R&S&.&CTIO$ (U2G)


27/33

GS% to ;C,%A4

"en a 8 in GSM is in pac+et transfer mode& it is te idle mode cell

reselection parameters tat control 'en te I,$ cell reselection to

"#M$ 'ill ta+e place*

erefore& it is of importance tat te idle mode parameters are

correctl% cosen to support te intended strateg% for speec& S

serices and idle mode camping*

!S Services Strate:6IRAT C&.. CHA$G& C&.. R&S&.&CTIO$ (G2U)


28/33

U%TS to GS% D (U2G) !arameter &ntit6

Start M measurements 2d c!o or ,S

Stop M measurements 2f c!o and ,S6 trigger 3a c!o or ,S

:smTres3a ,SSI

$ combination of I,$ 6andoer and ell reselection*

D ,edicated mode

!S Services Strate:6IRAT C&.. CHA$G&

GS% to U%TS (G2U) !arameter &ntit6

1) Startstop measurements :SI al'a%s& neer or ,SSI

2) ,S ealuation 5##:MI! c!o

and 5##:55 ,S s ,SSI omparsion


29/33


30/33

HS,!A %o#ilit6 !ase 2

"en a 8 is on 44_#6 (6S)& no GSM measurements or I,$andoer are supported* o proide mobilit% ia connected mode for

I,$ users& in case an I,$ neigbor can proide a better coerage&

te 6S to #6 transition can be triggered b% poorualit6,etected

(eent 2d or Fd)*

0 ?enefit is reduced outage time troug I,$ cell cange compared to

I,$ cell reselection for S serices*

0 #ra'bac+ is reduced 6S#$ coerage and decreased user

e7perienced S data trougput*


31/33

Additional eatures (R$C RE)

0 Serice ?ased 6andoer to GSM

nables operators to restrict or promote I,$ andoers for

speec serices* !ot actiated during net'or+ rollout*

0 #irected ,etr% to GSM

ff-load traffic from a "#M$ cell to a co-sited GSM cell*

Speec call 'it no ongoing pac+et connection is te onl%serice tat is dierted to GSM* !ot actiated during net'or+

rollout*


32/33


33/33

IRAT - Claro !arameters

IRAT parameter

etting_Claro_Rev

Documents

Iratpresentationreviratbclaro 150806175300 Lva1 App6891 (1)