release with redirect to lte

8/9/2019 Release With Redirect to LTE

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Release with Redirect to LTE

Contents

1 Introduction

1.1 Basic Characteristics

1.2 Benefits

2 Feature Operational Description

2.1 Network Requirements

2.2 Technical Description

3 Parameters

3.1 Introduced arameters

3.2 arameters ran!e and default "alues 3.3 #ffected arameters

3.$ arameters #ffectin! the %eature

4 Network Impact

$.1 &u'scri'er Capacit(

$.2 Network erformance

$.3 )ardware

$.$ Inter*Node Interface

$.+ ,ther Network -lements

5 Associated Features and Affected Functions

+.1 rerequisite %eatures

+.2 #ffected %eatures

+.3 Related %eatures

+.$ #ffected &(stem %unctions

6 Performance

.1 /Is

.2 Counters

.3 -"ents

Operation and !aintenance

0.1 #cti"atin! the %eature

0.2 Deacti"atin! the %eature

0.3 -n!ineerin! uidelines

"eference #ist

1Introduction

This document descri'es the Release with redirect to T- FAJ 121 2174 feature and its main

'enefits and impacts in the CD4# R#N.



1.1Basic Characteristics

This section descri'es the 'asic characteristics of the feature.

Feature

identit$%

FAJ 121 21745 Release with Redirect to T-

"elease% Introduced in 12.1. -nhanced in 13.6. -nhanced in 13.1.

Dependencies

This feature requires the followin! R#N feature to 'e acti"e7

T- Cell Reselection FAJ 121 14745 refer to Idle 4ode and Common Channel Beha"ior

The followin! R#N features needs to 'e acti"e for usin! parts of this feature7

%ast Dormanc( )andlin! FAJ 121 1552 5 refer to Connection )andlin!

&hared R#N 84,CN9 multiple 4N support FAJ 121 974

%or usa!e of C&%B counters7 C& :oice %all'ack from T- FAJ 121 16105 refer to Idle

4ode and Common Channel Beha"ior

&hared Network &upport FAJ 121 2465 refer to &hared Network.

1.2Benefts

Release with Redirect to T- is an inter*R#T mo'ilit( function that pro"ides 'asic mo'ilit( foran T-*capa'le ;- from CD4# to T-. Redirection to T- is controlled '( the network andcan 'e initiated at se"eral tri!!er points5 which can 'e indi"iduall( turned on and off in each

;TR#N cell. # redirection to T- can 'e initiated from the acti"e states C-<DC)5 C-<%#C)or ;R#<C).

Figure 1 Release with Redirect to LTE enhances o!ilit" #ro $TRA% to LTE&

The Release with Redirect to T- feature has the followin! 'enefits7

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It complements the feature T- Cell Reselection 8FAJ 121 14749 and assures mo'ilit( to

T- for an acti"e ;-. # ;- that is "er( acti"e can spend "er( little time in Idle mode orin state ;R#<C) where T- Cell reselection can 'e performed. ithout Release withRedirect to T- feature5 such ;- ma( remain in CD4# for an unnecessaril( lon! time.

CD4# R#N capacit( is enhanced '( faster unloadin! of T-*capa'le users to the T-

network.

&er"ice performance for an indi"idual T-*capa'le ;- is enhanced '( impro"in! the

possi'ilit( for the end user to ha"e access to T- ser"ices.

&er"ice performance for an indi"idual T-*capa'le ;- is enhanced '( the a'ilit( to

pro"ide fast return to T- after a C& %all'ack to CD4#. # user that arri"ed in CD4#due to a C& %all'ack from T- can5 with this feature5 'e returned to T- immediatel(

when the C& session is completed in CD4#.

The redirection to T- can 'e tri!!ered at different points in time. This ena'les tunin!

the feature for 'est end user performance.

In a ;TR#N s(stem with multi*operator Core Networks 8CNs9 usin! the &hared Network

feature 4ulti*,perator Core Network 84,CN9 8FAJ 121 97495 each CN operator candefine their own tar!et T- frequencies to which the ;- is redirected.

In a ;TR#N s(stem with shared networks usin! the feature &hared Network &upport

8FAJ 121 24695 controlled interopera'ilit( 'etween networks is possi'le '( selecti"e

redirection of ;-s to desired T- networks.

The feature uses a 'lind redirection and does not require ;- support for T-

measurements in acti"e mode. B( a"oidin! measurements there is no throu!hputde!radation due to compressed mode patterns.

The ;- chooses the 'est T- cell at time of arri"al to T- 8there is no pre*allocation ofresources in the tar!et T- s(stem9. The redirection to T- is fast when T- co"era!e isa"aila'le.

Release with Redirect to T- supports redirection to T- %DD and T- TDD.

The feature requires a 4ulti*R#T capa'le 8CD4# and T-9 ;- supportin! 3 2+.331release =.$.6 or later.

This feature does not impact the mo'ilit( of a non*T- capa'le ;-.

2Feature Operational Description

This section descri'es the feature Release with Redirect to T-5 FAJ 121 2174 in more detail5includin! network confi!uration requirements.

2.1Network Requirements

This is a CD4#*T- radio network inter*workin! feature. It is applica'le for CD4# networks

with partial or complete o"erlappin! T- co"era!e.



%or the redirection to T- of a ;- to succeed in a certain position5 the followin! must 'e

fulfilled7

* There has to 'e radio co"era!e from the T- network.

* The ;- needs to 'e T- capa'le and support the frequenc( 'ands of the nei!h'orin!T- network.

* The ;- su'scription needs to allow access in the T- network.

Before acti"atin! the feature5 ensure that the feature T- Cell Reselection5 FAJ 121

14745 is installed and acti"ated in the RNC.

2.2 Technical Description

%eature Release with Redirect to T- ena'les R#N controlled mo'ilit( of a ;- in a connected

state from ;TR#N to T-. %or each ;TR#N cell5 or for each Iur ink in case the ;- has passedan RNC 'order5 the operator selects which tri!!er points are ena'led and which T- nei!h'orfrequencies are used for redirection from this cell. The 'est cell of the acti"e set is used whenselectin! T- nei!h'ors and e"aluatin! tri!!ers. The 'est cell is the acti"e set cell with the 'estqualit( 'ased on the latest reported primar( CIC) measurement.

2.2.1 "edirection

%or Release with Redirect to T- to 'e performed5 the followin! must 'e met7

The feature is ena'led.

The ;- is T-*capa'le.

No C& si!nallin! connection e>ists. # & session can e>ist and can 'e pre*emptied.

The 'est cell has an T- nei!h'or frequenc( in an T- frequenc( 'and supported '( the

;-.

In case the feature 4,CN5 FAJ 121 974 is acti"ated5 the ;- is connected to a CN

operator and supports the T- nei!h'or frequencies confi!ured for that CN operator.

In case the feature &hared Network &upport 8FAJ 121 2469 is acti"ated5 then at least

one nei!h'orin! T- frequenc( of the 'est cell is allowed for redirection accordin! to the&hared Network &upport filterin! procedure. %or more information5 refer to &hared

Network.

%or a ;- with 'est cell located in &RNC7

o The ;tran Cell parameter releaseRedirect has the "alue ?-;TR#? or

?;TR#N<-;TR#?.

o The applica'le tri!!er point occurred and is ena'led in the 'est cell.

%or a ;- with 'est cell located in DRNC7







o The Iur ink parameter releaseRedirect has the "alue ?-;TR#? or

?;TR#N<-;TR#?.

o The applica'le tri!!er point occurred and is ena'led for the Iur ink.

o DRNC has confi!ured -;TR# nei!h'or frequenc( information and sends it to the&RNC.

hen Ro'ustness &upport is acti"ated5 the followin! two additional conditions are

e"aluated7

o hen a ;- is redirected from T-5 RNC is read( with determination of the

reason.

o hen determination is read(5 RNC checks that the ;- is not redirected from T-

due to co"era!e or load. This check is not done for tri!!er ?normal release?.

hen all criteria are fulfilled5 the R#N orders the ;- to mo"e to T- '( sendin! RRCConnection Release messa!e with redirection information. The messa!e con"e(s from one up

to ei!ht -*;TR# tar!et frequencies.

hen the ;- recei"es the order in an( of the acti"e states C-<%#C) or C-<DC)5 itreleases its resources in CD4# and !o to search for an T- cell on an( of the con"e(edfrequencies. #s soon as it finds a suita'le T- cell5 the ;- re*esta'lishes its radio connection toT- '( sendin! a Trackin! #rea ;pdate messa!e to the eNodeB.

2.2.2 &apa'ilit$ (andlin)

hen the RRC connection is esta'lished5 RNC e"aluates and stores the ;- capa'ilities. RNC

checks if the ;- is T- %DD or T- TDD capa'le5 or 'oth. #n T- capa'le ;- also reports thesupported T- frequenc( 'ands. -ach -*;TR# frequenc( 'and contains a specified set of -*;TR# #'solute Radio %requenc( Channel Num'er 8-#R%CN9. hen it is time to decide whetherto redirect a ;- to T-5 a filterin! of the confi!ured nei!h'ors is done. The ;- is onl(redirected if the ;- capa'ilities support at least one -*;TR# frequenc( confi!ured as anei!h'or in the current 'est cell.

If the FAJ 121 '96'7 T- Cell Reselection for #d"anced T- Deplo(ments feature is ena'led5multiple frequenc( 'ands for the correspondin! primar( -*;TR# nei!h'or frequencies are

confi!ured in RNC. hen the ;- does not support the primar( -*;TR# nei!h'or frequenc(5RNC performs an additional check to find if the ;- supports an( alternati"e 'and confi!ured in

the multiple frequenc( 'and list. The -#R%CN correspondin! to the first suita'le 'and that isfound is included in the RRC Connection Release messa!e.

2.2.3 #*+ Nei),'or Fre-uenc$ &onfi)uration

The tar!et -*;TR# nei!h'or frequencies used at Release with Redirect to T- are confi!uredfor each ;TR#N cell with the 4, EutranFreqRelation. The same relation is also used to

identif( the -*;TR# frequencies that are 'roadcast in &IB 1@. The parameterredirectionOrder controls how an EutranFreqRelation is used. The alternati"es are as

follows7

# "alue of A6A means that the EutranFreqRelation is not used for redirection to T-. In

this case the EutranFreqRelation is onl( used for 'roadcast in &IB 1@.



The "alue ran!e 1..= means that the EutranFreqRelation is also used '( Release

with Redirect to T- feature. The "alue ran!e 1..= controls the order in which the -*;TR# frequencies are listed in the RRC Connection Release messa!e. # -*;TR#frequenc( with a lower "alue of redirectionOrder appears first in the frequenc( list in

the messa!e.

The eutranFrequencyRef parameter5 'elon!in! to the EutranFreqRelation 4,5 refers to the

EutranFrequency 4, that contains the downlink -#R%CN 8earfcnDl9 used in -*;TR#N

nei!h'or cells. hen the FAJ 121 '96'7 T- Cell Reselection for #d"anced T- Deplo(mentsfeature is ena'led5 two new attri'utes7 multiFreqBand and measBandwidth are introduced to

the EutranFrequency 4, for the o"erlappin! T- frequenc( 'ands. In this case5 the

eutranFrequencyRef parameter5 as an instance of EutranFrequency 4,5 also presents the

correspondin! information on the multiple frequenc( 'ands.

rerequisites for release with redirection to T- to 'e tri!!ered o"er Iur are that -*;TR#nei!h'or frequencies are confi!ured in the DRNC and that the -*;TR# nei!h'or frequenc(information is transferred from the DRNC to the &RNC when the ;- mo"es. Concerns for -*

;TR# nei!h'or frequenc( confi!urations o"er Iur are as follows7

The transfer of -*;TR# nei!h'or frequenc( information o"er Iur is turned on '( settin!

the DRNC parameter 4, Iur ink eutraNeighborReportSrnc to "alue ?,N?.

The "alue of parameter redirectionOrder controls the order in which the -*;TR#

frequencies are listed in the RRC Connection Release messa!e also in the Iur case.

In case the shared network feature &hared R#N 84,CN95 FAJ 121 974 is ena'led in thenetwork the followin! applies7

%or each CN5 it can 'e confi!ured5 which T- networks that users connected to this CN

can 'e redirected to. This is confi!ured with the parameter 4, Cn,peratoriphoNetworkRefsEutra.

In case that certain -*;TR# frequencies are e>cluded for redirection for users connected

to a certain CN operator this is confi!ured '( parameter 4, -utran%reqRelation

barredCnOperatorRef.

In case the feature &hared Network &upport 8FAJ 121 2469 is ena'led in the network8parameter seloSup in 4, ando!er is set to ?TR;-?95 the followin! applies7

The RNC will anal(e the 4N*id part of the I4&I 8home 4N*id95 and filter the list of

nei!h'orin! frequencies of the 'est cell 'efore the list is sent to the ;-. The home4N*id must match either the "alue of plmn"dentity or an( "alue in

alias#lmn"dentities in 4, EutraNetwork in order for redirection to 'e performed. If

a match occurs5 then redirection is allowed to the T- nei!h'orin! frequencies

'elon!in! to the 4, EutraNetwork. ,therwise5 redirection is not performed. Note that

support for T- nei!h'orin! frequencies recei"ed o"er Iur is possi'le5 in which case the

same filterin! mechanism applies. %or more information5 refer to &hared Network.

hen a tri!!er point occurs a filterin! takes place to determine which -*;TR# frequencies toinclude in the Release with Redirect messa!e. In case no -*;TR# frequencies are a"aila'le5 noredirection messa!e is sent to the ;-.

2.2.$ &onfi)uration of *ri))ers

Release with Redirect to T- has the followin! tri!!ers7





normalRelease7 hen RNC recei"es R#N# Iu Release Command from the last CN

connection5 with a cause "alue counted as a ?normal? release. This is the same situationas when a non*T- capa'le ;- is released to Idle. The cause "alues for the Iu ReleaseCommand counted as ?normal? release are7

o Normal Release

o &uccessful Relocation

o Resource ,ptimiation Relocation

o ;ser inacti"it(

o No remainin! R#B

fastDormancy7 hen RNC recei"es RRC &i!nallin! Connection Release Indication

8&CRI9 with cause "alue set to ?;- Requested & Data session end?. This is the samesituation as when a %ast dormanc( would 'e tri!!ered for a non*T- capa'le ;-.%or this tri!!er to occur the feature %ast Dormanc( )andlin! 8FAJ 121 15529 should 'eacti"ated. %or more information5 refer to Channel &witchin!.

fach$o%ra7 hen RNC detects a period of inacti"it( in C-<%#C)5 at the point in time

when a non*T- ;- is switched to ;R#<C) or Idle.

dch$oFach7 This tri!!er initiates a redirection to T- at an( of the followin! situations7

o hen RNC detects a period of inacti"it( in C-<DC)5 at the point in time when

a non*T- ;- is switched to C-<%#C).

o hen the connection has Speech ' #S "nteracti!e ()( esta'lished and RNC

recei"es R#N# Iu Release Command from the C& CN5 with a cause "aluecounted as a ?normal? release.

csFallbackCsRelease7 hen RNC recei"es R#N# Iu Release Command from the C&

CN5 with a cause "alue counted as a ?normal? release5 for a ;- which has done C&%all'ack from T-. The ;- is immediatel( redirected 'ack to T-. #n( acti"e & R#B ispre*empted. The cause "alues for the Iu Release Command counted as ?normal? releaseare as follows7

o Normal Release

o &uccessful Relocation

o Resource ,ptimiation Relocation

o ;ser inacti"it(

o No remainin! R#B

Do not ena'le this tri!!er and tri!!er csFallbackDch$oFach at the same time.

csFallbackDch$oFach7 This tri!!er is applica'le for a ;- which has done C& %all'ack

from T-. The tri!!er initiates a redirection to T- at an( of the followin! situations7





o hen RNC detects a period of inacti"it( in C-<DC)5 at the point in time when

a non*T- ;- is switched to C-<%#C).

o hen the connection has Speech ' #S "nteracti!e ()( esta'lished and RNC

recei"es R#N# Iu Release Command from the C& CN5 with a cause "aluecounted as a ?normal? release.

o hen a connection has &peech onl( esta'lished and RNC recei"es R#N# Iu

Release Command from the C& CN5 with a cause "alue counted as a ?normal?release.

This tri!!er pro"ides redirect of a C& %all'ack ;- when the speech call is completed andwhen an( esta'lished & R#B is inacti"e. hen this tri!!er is ena'led5 do not ena'letri!!er csFallbackCsRelease since that can perform the preemption of the &

Interacti"e R#B.

The tri!!er parameters are confi!ured separatel( for each ;tran Cell. ,ne or se"eral tri!!erparameters can 'e ena'led in a cell. -ach tri!!er is e"aluated separatel(5 and as soon as onetri!!er is fulfilled5 the redirection is performed.

The tri!!er parameters are confi!ured separatel( for each Iur ink. Tri!!er fach$o%ra is not

applica'le for an Iur ink5 since a ;- cannot 'e in state C-<%#C) when connected to aDRNC.

2.2.+ Detection of &. Fall'ack

,ne of the possi'le criteria to redirect a ;- to T- is that the ;- arri"ed in CD4# R#N due to

a C& %all'ack from T-. # C& %all'ack occurs when a ;- is redirected to CD4# from T- toset up a C& speech call. The RNC e"aluates at RRC connection esta'lishment if a ;- isredirected from T- due to a C& %all'ack. There are two wa(s to determine this dependent on

the release of the ;-7

Indication met,od7 %or a Release*16 ;- or later it is mandator( to support the I-

?C&%B Indication?5 for a ;- of Release*@ support of this I- is optional.

#t RRC Connection Request the presence of the I- ?C&%B Indication? indicates that the;- has arri"ed from T- due to a C& %all'ack. If ro'ustness support is ena'led it is alsorequired that the ;- within a short time esta'lishes a C& R#B in CD4# R#N to allow

the C& %all'ack tri!!ers.

Detection met,od7 ;sed for a Release*= ;- or a Release*@ ;- that does not include

the I- ?C&%B Indication?.

In this case R#N first decides if the ;- is redirected from T- which is the case whenthe ;- is T- capa'le and did not include the I- ?pre*redirection info? in RRCConnection Request. If a ;- that is redirected from T- within a short time esta'lishes aC& R#B in CD4# R#N5 then R#N assumes that the ;- arri"ed due to C& %all'ack fromT-.

%or description of C& %all'ack5 refer to LTE #eature () Fall!ac* #ro LTE 5 Reference 0.

# set of counters pro"ides o'ser"a'ilit( of C& %all'ack attempts and success and there is aseparate &peech #ccessa'ilit( /I for C&%B users5 refer to &ection erformance.



%or the C& %all'ack Indication method to work the ;- has to ha"e the R#N2 Release*@ optionalCR +627 8R2+12'169 ,-ntroduction o# a ()F. -ndicator in RR( (onnection Re/uest 9implemented. %rom Release*16 the support of C&%B Indicator is mandator(5 CR+620.

%or the C& %all'ack detection method to work the ;- has to ha"e the R#N2 Release*@ CR$2227 8R2+114674 ,(lari#ication o# the re+Redirection in#o setting a#ter the redirection #ro E+

$TRA 9 implemented. This CR is optional in Release*=.

2.2. "o'ustness .upport

Release with Redirect to T- e>pects that there is T- co"era!e5 since redirection is donewithout an( precedin! T- measurements. This means that in areas with uncertain T-co"era!e5 the feature must 'e used with care to a"oid poor end user performance5 see the

-n!ineerin! uidelines chapter.

hen a ;- is in an T- network and e>periences 'ad co"era!e5 the T- network can redirect

the ;- to ;TR#N5 refer to LTE #eature (oerage+Triggered 3(A )ession(ontinuit"Reference =. If ;TR#N redirects this ;- 'ack to T-5 there is an increased risk offailure in findin! a suita'le T- cell. To a"oid these failures and the correspondin! out ofser"ice time5 ;TR#N has Ro'ustness &upport to not redirect such a ;- to T-. This Ro'ustness&upport is controlled with the parameter 4, Rnc%unction robustRwrEutraEnabled.

hen Ro'ustness &upport is ena'led and a ;- is determined to ha"e arri"ed due to 'adco"era!e all tri!!ers e>cept normalRelease are 'locked for redirect to T- 5 see also

description of criteria for redirection.

hen Ro'ustness &upport is ena'led and as lon! as the ;- onl( has si!nallin! 'earers5 no R#Bhas 'een esta'lished5 all tri!!ers are 'locked for = seconds. This is to a"oid redirectin! a ;-

that onl( performs a re!istration or other si!nallin! onl( acti"it( in CD4#.

The detection of a co"era!e redirected ;- is 'ased on the same methods as Detection of C&%all'ack. hen a ;- is redirected from T- 'ut not determined to 'e due to C&%B5 then the ;-is assumed to ha"e arri"ed due to 'ad T- co"era!e or load sharin! in T-. #s for C& %all'ack5the detection mechanism requires correct usa!e '( the ;- of the I- ?re*Redirection info? andthat the ;- supports the R#N2 CR $222 8R2+114674 ,(lari#ication o# the re+Redirection in#osetting a#ter the redirection #ro E+$TRA.

If the CR $222 is not supported5 the ;- can erroneousl( appear to 'e redirected from T-. In

this case the onl( tri!!er that can occur is normalRelease. If the ;- is "er( acti"e5 neither

tri!!er normalRelease nor Cell Reselection to T- in Idle or ;R#<C) mode can happen. If

that is common it can 'e 'eneficial to disa'le the Ro'ustness &upport.

2.2.0 Adaptation of "elease wit, "edirect to #*+ after Incomin) I"A* Offload from#*+

# ;- that arri"es in ;TR#N with IR#T ,ffload from T- should not 'e sent 'ack to T- directl(to allow the load in the -*;TR# Cell to normalie. Therefore all tri!!ers for Release withRedirect to T- are 'locked for a time of blockRwrEutra$ime 84, ando!er9 after an incomin!

IR#T ,ffload from T-. %or more information5 refer to FAJ 121 427 7 IR#T ,ffload from T-.

The same applies when the feature FAJ 121 '5887 T- Cell Reselection Dedicated riorities isacti"ated and confi!ured to pre"ent ;- from reselectin! T- cells after IR#T ,ffload from T-.

In this case the 'lockin! time is replaced '( RncFunction**offloadDedic#rioEutra$ime .

2.2.= Adaptation of "elease wit, "edirect to #*+ after Incomin) I"A* (O due to&o/era)e

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# ;- that arri"es with IR#T), is assumed to do so due to insufficient T- co"era!e and alltri!!ers for Release with Redirect to T- are 'locked for the lifetime of the connection. Thishandlin! is applied for7

Incomin! &R:CC from T- 8C& onl(9

Incomin! &R:CC for :oice and Data from T-

Incomin! &), from T-

Incomin! C&), from &4

Note%Release with Redirect to T- is not 'locked after an incomin! CN)),.

3Parameters

This section descri'es parameters introduced '( Release with redirect to T- andparameters affected '( acti"atin! the feature.

3.1Introduced Parameters

This section descri'es all parameters that the operator can confi!ure to control

CD4# R#N FAJ 121 2174 Release with Redirect to T-. %urther parameterinformation can 'e found in Radio Network arameters.

4, ;tranCell releaseRedirect

Indicates if a ;- is redirected at RRC Connection Release. #pplica'le when this

;tran cell is the 'est in the acti"e set. If the "alue is ,%%5 no redirection takesplace. If the "alue is -;TR# or ;TR#N<-;TR#5 redirection to -*;TR# can takeplace for -*;TR# capa'le ;-s.

4, Iurink releaseRedirect

Indicates if a ;- is redirected at RRC Connection Release. #pplica'le when the;- has a DRNC cell as the 'est cell in its acti"e set. If the "alue is ,%%5 no

redirection takes place. If the "alue is -;TR# or ;TR#N<-;TR#5 redirection to-*;TR# can take place for -*;TR# capa'le ;-.

4, ;tranCell releaseRedirectEutra$riggers

Indicates the tri!!er points where a ;- shall 'e redirected to -*;TR# in casethe feature ReleaseRedirect+te is ena'led. Dependencies7 This attri'ute is

onl( used if releaseRedirect is set to -;TR# or ;TR#N<-;TR#. Ran!e7

mem'ers5 each with an ,N or ,%% "alue7

o csFallbackCsRelease7 RR to T- after C& %all'ack at C& release.

o fach$o%ra7 RR to T- at channel switch from %#C) to ;R#.





o fastDormancy7 RR to T- at %ast Dormanc(.

o normalRelease7 RR to T- at normal release.

o csFallbackDch$oFach7 RR to T- after C&%B at channel switch from

DC) to %#C) or at C& release from state &p6 or state &peech.

o dch$oFach7 RR to T- at channel switch from DC) to %#C) or at C&

release from state &p6.

4, Iurink releaseRedirectEutra$riggers

Indicates the tri!!er points where a ;- is redirected to -*;TR# in case thefeature ReleaseRedirect+te is ena'led for this Iurink. Dependencies7 This

attri'ute is onl( used if releaseRedirect is set to -;TR# or ;TR#N<-;TR#.

Ran!e7 mem'ers5 each with an ,N or ,%% "alue7

o csFallbackCsRelease7 RR to T- after C& %all'ack at C& release.

o fach$o%ra7 &ince C-<%#C) state is not used o"er Iur the "alue of

this parameter will 'e treated as ,%% re!ardless of its actual "alue.

o fastDormancy7 RR to T- at %ast Dormanc(.

o normalRelease7 RR to T- at normal release.

o csFallbackDch$oFach7 RR to T- after C&%B at channel switch from

DC) to %#C) or at C& release from state &p6 or state &peech.

o dch$oFach7 RR to T- at channel switch from DC) to %#C) or at C&

release from state &p6.

4, -utran%reqRelation redirectionOrder

Indicates whether EutranFreqRelation is included in the RRC Connection

Release messa!e in case of redirection to -*;TR#. The numerical "alue of this

parameter tells the order in which the -#R%CNs is listed in the messa!e. Ran!e6..= . :alue 6 means that this EutranFreqRelation is not used for

redirection to -*;TR#. #n instance with a "alue of 1 is listed first in the RRC

Connection Release messa!e.

4, Rnc%unction robustRwrEutraEnabled

Controls if detection of co"era!e or load redirection from T- is acti"ated in

CD4# R#N. The followin! two "alues are accepted7

o # "alue of $R%E7 acti"ate detection of co"era!e or load redirect from

T-.

o # "alue of F,+SE7 no detection of co"era!e or load redirect from T-.

4, Iurink eutraNeighborReportSrnc



Controls whether this RNC5 when it is in a DRNC role5 includes the nei!h'orin!-*;TR# cell information in messa!es sent to the &RNC o"er Iur. #n -ricssonRNC use dumm( "aria'les for -*;TR# cell identities when transferrin! nei!h'orinformation o"er Iur. The "alue of this parameter is set to OFF in case of inter*

opera'ilit( with other "endors RNC.

4, -utraNetwork plmn"dentity

The num'er of possi'le instances of 4, -utraNetwork is $. -ach -*;TR#network shall 'e identified '( its 4N identit(. The 4N identit( informationis con"e(ed o"er Iur when nei!h'or cells and frequencies are reported. This

parameter is used for filterin! of redirection tar!et frequencies in case feature4,CN or feature &hared Network &upport is ena'led.

4, -utraNetwork alias#lmn"dentities

ist of alias 4N identities for the selecti"e redirection feature. hen the

feature Release with Redirect to T- is acti"ated5 ;-s with home 4N*id equalto one of these alias 4N*ids will 'e redirected to the frequencies of this -*;TR# network. ,nl( used if ReleaseRedirect+te in 4, RncFeature is

acti"ated5 and &hared Network &upport is ena'led.

4, Cn,perator iphoNetworkRefsEutran

Defines the -*;TR# networks to which a ;- re!istered in this CN is allowed toperform a Release with redirect. ;sed '( the 4,CN feature to filter the -*;TR#frequencies allowed for Release with redirect. ,nl( used if feature 4,CN5descri'ed in &hared Network5 is ena'led.

4, Cn,perator CnOperator"nde- ;sed to distin!uish 'etween CN operators.The inde> represents one CN operator when the feature 4,CN5 descri'ed in&hared Network5 is ena'led. If the "alue of 4, Cn,perator CnOperator"nde-

is ?6? no monitorin! of redirection to -*;TR# per CN operator is done. ,nl(used if feature 4,CN5 descri'ed in &hared Network5 is ena'led.

4, -utra%reqRelation barredCnOperatorRef

Defines that the CN operator5 pointed out '( this parameter5 is not allowed touse this -utra%requenc(Relation. ;sed '( the Nri4ocn feature to filter the -*;TR# frequencies allowed for Release with redirect to T-. ,nl( used if feature4,CN5 descri'ed in &hared Network5 is ena'led.

3.2Parameters range and deault !alues

Ta!le 1 :erator araeters

Parameter Name Default 0alue 0alue ran)e

%tranCell**releaseRedirect ,%% ,%%5 -;TR#5 ;TR#N5

;TR#N<-;TR#

"ur+ink**releaseRedirect ,%% ,%%5 -;TR#5 ;TR#N5

;TR#N<-;TR#%tranCell**releaseRedirectEutra$riggers

,%% forcsFallbackCsRelease

,N or ,%%











mem'ers supported* csFallbackCsRelease

* csFallbackDch$oFach

* fach$o%ra

* fastDormancy

* normalRelease* dch$oFach

5csFallbackDch$oFach

5Dch$oFach

,N for

fach$o%ra5fastDormancy5normalRelease

"ur+ink**releaseRedirectEutra$riggers

mem'ers supported

* csFallbackCsRelease

* csFallbackDch$oFach

* fach$o%ra

* fastDormancy

* normalRelease

* dch$oFach

Note7

fach$o%ra

&ince C-<%#C) state is not used o"er Iurthe "alue of this parameter will 'e treated as

,%% re!ardless of its actual "alue

,%% forcsFallbackCsRelease

5csFallbackDch$oFach

5Dch$oFach

,N for fastDormancy5normalRelease

,N or ,%%

EutranFreqRelation**redirectionOrder 6 6..=

RncFunction**robustRwrEutraEnabled TR;- TR;- or %#&-

"ur+ink**eutraNeighborReportSrnc ,%% ,N or ,%%

EutraNetwork**plmn"dentity nEa F4CCG F4NCG

EutraNetwork**alias#lmn"dentities nEa 6..$CnOperator**CnOperator"nde- 6 6..$

CnOperator**iphoNetworkRefsEutran nEa nEa

EutraFreqRelation**barredCnOperatorRef nEa nEa

3.3"#ected Parameters

The implementation of this feature affects no other parameters.

3.4Parameters "#ecting the Feature

->istin! inacti"it( parameters for channel switchin!5 from C-<DC) to C-<%#C)5as well as from C-<%#C) to ;R#<C)5 are applied for Release with redirect to T-.

The Release*with*Redirect to T- feature 8FAJ 121 21749 can redirect a ;- to T- atdifferent downswitches or at release5 for e>ample at transitions from DC) to %#C) or;R#5 tri!!ered '( inacti"it( or fast*dormanc(. # ;- that is offloaded from T- andthen setups a connection in CD4# should prefera'l( not return immediatel( to T-.# new RNC parameter ando!er**blockRwrEutra$ime is introduced with the IR#T

,ffload from T- feature 8FAJ 121 '427 95 to limit the returns to T- when T- has

hi!h load and R#Bs are successfull( setup in CD4#. hile this timer is not (ete>pired5 the feature Release*with*Redirect to T- is inhi'ited for this ;-5 durin! a

predefined time.



To support selecti"e redirection usin! the feature &hared Network &upport5 theparameter seloSup in 4, ando!er must 'e ena'led.

Release ith Redirect can 'e pre"ented for some class of su'scri'ers with the help offeature &u'scri'er 'ased mo'ilit( usin! &ID 8FAJ 121 '6'7 9. It allows the RNC todifferentiate 'eha"ior 'ased on the su'scri'er profile pro"ided '( the CN. # new

parameter spid#re!entRwrEutra in 4, Subscr#rofile"dandling specifies the

&u'scri'er rofile ID 8&ID9 "alues that are used to pre"ent Release ith Redirect. If

the &ID "alue recei"ed for a ;- matches an( "alue in that parameter5 the Releaseith Redirect is not allowed.

4Network Impact

This section descri'es how the Release with redirect to T- feature impacts thenetwork functions and capa'ilities.

4.1$u%scri%er Capacit&

This section pro"ides information on the impact of the feature on su'scri'er capacit(.

hen this feature is acti"ated the T- capa'le ;-s will ha"e a faster return 'ack to

T- and will in !eneral spend more time in T-. In this wa( this feature impacts theIR#T traffic distri'ution. hether this !ain is possi'le to o'ser"e depends on the

network and parameters such as7 num'er of ;-s with multi*R#T capa'ilities5 thenetwork confi!uration5 the traffic model as well as the T- network co"era!e andcapacit(.

4.2Network Perormance

This section pro"ides information on the impact of the feature on networkperformance.

This feature leads to faster return to T- of T- capa'le ;-s.

4.3'ardware

No feature specific information is identified.

4.4Inter(Node Interace

This section pro"ides information on the impact on inter*node interfaces.

hen Release with redirect to T- is ena'led o"er Iur the -*;TR# nei!h'or frequenc(information needs to 'e transferred from DRNC to &RNC '( usin! the e>istin! Iur

interface 8RN&#9 messa!es.

4.5Other Network )lements



This section pro"ides information on the impact on other network elements.No feature specific information is identified.

5"ssociated Features and "#ected Functions

This section descri'es how the Release with redirect to T- FAJ 121 2174 feature

affects other features and functions.

5.1Prerequisite Features

Ta'le 2 lists prerequisite features to the Release with redirect to T- feature.

Ta!le 2 rere/uisite Features

Feature Description

T- Cell Reselection 8%#H 121 1$0$9 Introduces support for inter*workin! 'etween ;TR#N and -*;TR#.

5.2"#ected Features

Dependin! on which tri!!er points are ena'led5 there are impacts on the distri'ution

of ;- 'etween RRC states and transitions 'etween RRC states. This chan!e is "isi'lein the counters reflectin! these state transitions in ;TR#N cells where the T-redirection is performed.

Ta'le 3 lists features that are affected '( the Release with redirect to T- feature.

Ta!le ' A##ected Features

Feature Description

;TR#N Re!istration #rea )andlin! 8%#H 121$609

hen the fach$o%ra tri!!er are turned ,N the T-*capa'le ;- is not

switched to state ;R#<C)5 in case the conditions for redirectin! the ;-

to -;TR# are fulfilled.

%ast Dormanc( )andlin! 8%#H 121 1++29 hen the tri!!erin! point fastDormancy is ena'led5 the T-*capa'le ;-

is not switched to ;R#<C) at fast dormanc( indication from the ;-5 incase the conditions for redirectin! the ;- to -*;TR# are fulfilled.

5.3Related Features

The feature %requenc( riorit( at Connection Release 8FAJ 121 2'689 can alsoperform redirection at release of the connection. hen Release with Redirect to T-

and %requenc( riorit( at Connection Release are ena'led at the same time in a cell5the followin! applies7

%or an T- capa'le ;- the network first e"aluates if Release with Redirect to

T- can 'e performed. If redirection to T- is not performed5 the feature

%requenc( priorit( at connection release is e"aluated.

# non*T- capa'le ;- is not handled '( the feature Release with Redirect toT-. ,nl( the %requenc( riorit( at Connection Release is e"aluated for a non*T- capa'le ;-.

http://edw//alex?fn=114_1553-HSD10102Uen.E.html

http://edw//alex?fn=114_1553-HSD10102Uen.E.html



The feature &u'scri'er 'ased mo'ilit( usin! &ID 8FAJ 121 '6'7 9 can 'e used topre"ent Release ith Redirect for users with certain &u'scri'er rofile IDs5 fore>ample users without T- su'scription. %or more information a'out &u'scri'er 'asedmo'ilit( usin! &ID refer to )"ste escri:tion.

5.4"#ected $&stem Functions

Dependin! on which tri!!er points are ena'led there are impacts on the distri'ution

of ;- 'etween RRC states and transition 'etween RRC states. Ta'le $ lists functionsaffected '( the Release with redirect to T- feature.

Ta!le 4 A##ected )"ste Functions

Function Description

Channel switchin! hen an( or 'oth of the tri!!erin! points dch$oFach and csFallbackDch$oFach are

ena'led5 the T-*capa'le ;- is not switched to C-<%#C)5 in case the conditions for

redirectin! the ;- to -*;TR# are fulfilled.

6Perormance

This section descri'es performance indicators5 counters5 and e"ents associated withthe Release with redirect to T- feature.

6.1*PIs

The feature Release with Redirect to T- determines when a C& fall'ack from T-occurs5 see &ection 2.2.+. This is also used to pro"ide a separate C&%B 'ased &peech

/e( erformance Indicator7 Circuit*&witched 8C&9 &peech #ccessi'ilit( at C& :oice%all'ack from T-.

E/uation 1 (ircuit+)witched ;() ):eech Accessi!ilit" at () <oice Fall!ac* #ro LTELoad )haring E=cluded

This /I depends on that the ;- population in the network utilie 'oth t(pes of C&%Bdetermination methods. If that is not the case the counters for the non used methodwill 'e ero and the /I should 'e re"ised to onl( use the applica'le of C&%B detected



counters or of C&%B indicated counters5 see &ection .2 Counters for description ofC&%B counters.

6.2Counters

"elease wit, "edirect to #*+ ,as t,e followin) options for o'ser/a'ilit$

defined%

;tran Cell counter pmRedirect,ttemptsEutra counts the total num'er of

attempts tri!!ered '( the RNC to redirect a ;- to -*;TR# from this ;tran Cell.Incremented '( 1 in the 'est cell in the acti"e set when an RRC Connection

Release messa!e with I- -*;TR# tar!et infoJ is sent to a ;-. &tepped once forthe redirection5 not stepped for indi"idual R#Bs5 and not for repetitions of the

RRC Connection Release messa!e.

Iur ink counter pmRedirect,ttemptsEutra counts the total num'er of

attempts tri!!ered '( the RNC to redirect a ;- to -*;TR# for ;-s with 'estcell in the DRNC connected with this Iur ink.

Incremented '( 1 in the Iur ink when an RRC Connection Release messa!ewith I- A-*;TR# tar!et infoA is sent to a ;-. &tepped once for the redirection5not stepped for indi"idual R#Bs5 and not for repetitions of the RRC ConnectionRelease messa!e.

Counter pm$otNoRrcConnect%eCapability * Num'er of times that a ;-

supportin! -*;TR# successfull( set up an RRC connection.Below counter elements are onl( stepped 'ased on information recei"ed inRRC Connection &etup Complete71$7 -*;TR# TDD capa'ilit(

1+7 -*;TR# %DD capa'ilit(17 -*;TR# TDD and %DD capa'ilit(

Counter pmSpid#re!entRwrEutra counts the num'er of times a Release ith

Redirect to -*;TR#N has 'een pre"ented 'ecause of recei"ed &u'scri'errofile ID 8&ID9 "alue.

If the feature 4,CN 8FAJ 121 9749 is ena'led in the network the num'er of attemptsto tri!!er redirect to -*;TR# can additionall( 'e counted also !rouped per CNoperator. -ach CN operator is identified '( confi!urin! the parameter 4, Cn,peratorcnOperator"nde- with a "alue 'etween 1..$. The ;tran Cell counter

pmRedirect,ttemptsEutraCnOper is then indi"iduall( stepped per CN operator. # CN

operator is identified since the inde> of the counter matches the "alue 4, Cn,peratorcnOperator"nde-5 for e>ample pmRedirect,ttemptsEutra./0 .

hen a redirection to T- is done5 there is some impact to e>istin! counters that arestepped 'ased on the cause "alue in the R#N# Iu Release Command. %or a Channel&witch from C-<%#C) to Idle without redirect to T-5 the cause "alue used in theR#N# Iu Release Request is A;ser Inacti"it(A. If the same Channel &witch performs aredirection to T- the cause "alue used is Resource ,ptimisation RelocationJ. This

difference impacts the pmChSwitchFach"dle counter5 which is stepped onl( for the

cause "alue A;ser Inacti"it(A 8assumin! that the CN returns the same cause "alue in

the IuReleaseCommand as was sent in the IuReleaseRequest9.

&. Fall'ack from #*+ ,as t,e followin) options for o'ser/a'ilit$ defined%



C&%B counters require the feature C& :oice %all'ack from T- 8FAJ 121 16109 to 'eacti"ated.

;tranCell counter pm$otNoRrcConnReqCsfb"nd counts the total num'er of RRC

Connection Request messa!es that included the I- C&%B IndicationJ5 notincludin! retransmissions.Incremented '( 1 per connection when the RNC recei"es an RRC ConnectionRequest messa!e that includes the I- C&%B IndicationJ from the ;- with an(-sta'lishment Cause.

;tranCell counter pmNo+oadSharingRrcConnCsfb"nd counts the total num'er

of con"ersational 8emer!enc(5 ori!inatin! K terminatin!9 load sharin! RRCconnection attempts5 for ;-s that included the I- C&%B IndicationJ in the RRC

Connection Request.Incremented '( 1 per connection when the RNC sends a RRC Connection

ReLect messa!e to a ;- usin! the C& ser"ice5 'ecause another cell 8frequenc(9has 'een selected '( oad &harin!5 if the ;- included the I- C&%B IndicationJ

in the RRC Connection Request.

;tranCell counter pm$otNoRrcConnReqCsfb"ndSucc counts the total num'er of

successful RRC Connection Requests for which the ;- includes the I- C&%BIndicationJ.Incremented '( 1 when the RNC recei"es an RRC Connection &etup Completemessa!e indicatin! that the RRC connection is considered to 'e successfull(esta'lished5 for a ;- that includes the I- C&%B IndicationJ at RRCesta'lishment.

;tranCell counter pmNoSystemNasSignRelCsfb"nd counts the total num'er of

s(stem*inititated releases of the Non #ccess &tratum 8N#&9 si!nallin!

sequence at call setup towards a C& CN5 for ;-s that includes the I- C&%BIndicationJ at RRC esta'lishment. ,nl( stepped for call setup from idle.Incremented '( 1 in the 'est cell in the acti"e set for each s(stem*initiatedrelease of the N#& si!nallin! sequence at call setup towards a C& CN5 if the

RNC recei"ed an RRC Initial Direct Transfer messa!e prior to the N#& si!nallin!phase and the ;- included the I- AC&%B IndicationA at RRC esta'lishment. The

N#& si!nalin! phase is the phase after I; &i!nalin! Connection esta'lishmentand 'efore R#B #ssi!nment Request. # s(stem*initiated release can 'etri!!ered '(7* a R#N# Reset messa!e recei"ed from the CNM* a R#N# Iu Release Command messa!e recei"ed from the CN with AreleasecauseA set to an(thin! other than ANormal ReleaseA5 A&uccessful RelocationA5AResource ,ptimisation RelocationA5 or A;ser Inacti"it(AM* a R#B #ssi!nment Request messa!e recei"ed from the CN with Arelease

causeA set to an(thin! other than ANormal ReleaseA5 A&uccessful RelocationA5AResource ,ptimisation RelocationA5 or A;ser Inacti"it(AM

* the RNC when sendin! a R#N# Reset Resource messa!e to the CNM* detection in the RNC of R#N# &er"ice ;na"aila'le.Counter supported in DRNC if "ur+ink**srnc#mReporting ?,N? in &RNC.

;tranCell counter pmNoNormalNasSignRelCsfb"nd counts the total num'er of

successful normal releases of the N#& si!nallin! sequence at call setuptowards a C& CN for ;-s that included the I- C&%B IndicationJ at RRC

esta'lishment. ,nl( stepped for call setup from idle.Incremented '( 1 in the 'est cell in the acti"e set for each normal release ofthe N#& si!nallin! sequence at call setup towards a C& CN5 if the RNC recei"edan RRC Initial Direct Transfer messa!e prior to the N#& si!nallin! phase andthe ;- included the I- AC&%B IndicationA at RRC esta'lishment. The N#&



si!nalin! phase is the phase after I; &i!nalin! Connection esta'lishment and'efore R#B #ssi!nment Request. # normal release can 'e tri!!ered '(7* a R#N# Iu Release Command messa!e recei"ed from the CN with AreleasecauseA set to ANormal ReleaseA5 A&uccessful RelocationA5 AResource ,ptimisationRelocationA5 or A;ser Inacti"it(AM

* a R#B #ssi!nment Request messa!e recei"ed from the CN with Arelease

causeA set to ANormal ReleaseA5 A&uccessful RelocationA5 AResource ,ptimisationRelocationA5 or A;ser Inacti"it(AM* a R#B #ssi!nment Request messa!e with the I- ?R#Bs to 'e setup ormodified? for a call setup attempt towards a new C& CN.Counter supported in DRNC if "ur+ink**srnc#mReporting ?,N? in &RNC.

;tranCell counter pmNoRabEst,ttCsfb"nd counts the total num'er of C& R#B

esta'lishment attempts for ;-s that indicated the I- C&%B IndicationJ in the

RRC Connection Request.Incremented '( 1 when the RNC recei"es a R#N# R#B #ssi!nment Requestmessa!e from the C& CN with R#Bs to 'e set up5 after the confi!uration isselected as a "alid final tar!et confi!uration. ,nl( stepped one time for the

first C& R#B after C&%B from -*;TR# and onl( for a ;- that included the I- C&%B IndicationJ in RRC Connection request.Counter supported in DRNC if "ur+ink**srnc#mReporting ?,N? in &RNC.

;tranCell counter pmNoRabEst,ttCsfbDetect counts the total num'er of C&

R#B esta'lishment attempts for ;-s that did not include the I- C&%BIndicationJ in the RRC Connection Request 'ut are still considered to ha"e donea C&%B from -*;TR# since7*the ;- is -*;TR# capa'le

*the ;- did not include the I- pre*redirection info in the RRC ConnectionRequest

*a R#B #ssi!nment Request was recei"ed from the C& CN within = seconds

from the RRC Connection -sta'lishment.Incremented '( 1 when the RNC recei"es a R#N# R#B #ssi!nment Requestmessa!e from the C& CN with R#Bs to 'e set up5 when the confi!uration isselected as a "alid final tar!et confi!uration. ,nl( stepped one time for a ;-for the first C& R#B after C&%B from -*;TR#.Counter supported in DRNC if "ur+ink**srnc#mReporting ?,N? in &RNC.

;tranCell counter pmNoRabEstSuccCsfb"nd counts the total num'er of

successful C& R#B esta'lishments for a ;-s that include the I- C&%BIndicationJ in the RRC Connection Request.Incremented '( 1 in the &RNC after sendin! a R#N# R#B #ssi!nmentResponse messa!e to the CN5 indicatin! a successful R#B esta'lishment. ,nl(stepped one time for the first C& R#B after C&%B from -*;TR# and onl( for a;- that included the I- C&%B IndicationJ in RRC Connection Request.

Counter supported in DRNC if "ur+ink**srnc#mReporting ?,N? in &RNC.

;tranCell counter pmNoRabEstSuccCsfbDetect counts the total num'er of

successful C& R#B esta'lishments for the ;-s that did not include the I- C&%BIndicationJ in the RRC Connection Request 'ut are still considered to ha"e donea C&%B from -*;TR# since7*the ;- is -*;TR# capa'le

*;- did not include the I- pre*redirection infoJ in the RRC Connection Request*a R#B #ssi!nment Request was recei"ed from the C& CN within = seconds

from the RRC Connection -sta'lishment.Incremented '( 1 after sendin! the R#N# R#B #ssi!nment Responsemessa!e to the CN5 indicatin! a successful R#B esta'lishment. ,nl( stepped



one time for the first C& R#B after C&%B from -*;TR#.Counter supported in DRNC if "ur+ink**srnc#mReporting ?,N? in &RNC.

6.3)!ents

Ta!le 5 Eents

+/ent +/ent Parameter Description

"N$ERN,+1R,B1ES$,B+"S2EN$

"N$ERN,+1C,++1SE$%#1F,"+

E3EN$1#,R,21CSFB arameter C&%B pro"ides o'ser"a'ilit( of

the esta'lishment of the first &peech Call

when a ;- has arri"ed from T- due to

C& %all'ack 8C&%B9. The indication can 'e

set after a C&%B at Call &etup %ailure and

at R#B -sta'lishment of the first C& R#B.In all other situations N,<C&%B is

indicated. This parameter requires thelicense for feature C& :oice %all'ack from

T-5 %#H 121 116. There are two wa(s to

identif( a C&%B ;- and the( arerepresented with separate "alues7

* for R 16 8mandator(9 and some R @

8optional support9 ;-s there is an I-

AC&%B IndicationA in RRC Connection

Request. :alue C&%B<INDIC#T-D is set.* for R = and some R @ ;-s no such I- is

supported. %or these ;-s an assumptionmethod is used to detect C&%B5 refer to

&ection 2.2.+.. :alue C&%B<D-T-CT-D isset.

4ore information a'out e"ents can 'e found in eneral erformance -"ent )andlin!RB& and eneral erformance -"ent )andlin! RNC.

7Operation and +aintenance

This section pro"ides ,peration and 4aintenance 8,K49 information for the Releasewith redirect to T- feature.

7.1"cti!ating the Feature

0.1.1 Preconditions

Before FAJ 121 2174 Release with Redirect to T- can 'e acti"ated5 the followin!conditions ha"e to 'e fulfilled7

FAJ 121 14745 T- Cell reselection needs to 'e installed and acti"ated in the

RNC.

To use redirection to T- at %ast Dormanc( the feature %ast Dormanc(

)andlin! 8FAJ 121 15529 needs to 'e installed and acti"ated.

To use the counters and e"ents related to C& %all'ack the feature C& :oice

%all'ack from T- 8FAJ 121 16109 needs to 'e installed and acti"ated.

Confi!ure 4, 4cdmaCarrier with the ;TR#N frequenc( 'and for each ;#R%CN.

This is a prerequisite for T- nei!h'or filterin! as the ;- pro"ides the

supported T- frequenc( 'ands per ;TR#N frequenc( 'and.

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Confi!ure at least one instance of 4, EutranFreqRelation for T- nei!h'ors

in each ;tran Cell where the feature Release with Redirect to T- shall 'eused. %or this5 the followin! is required7* #t least one instance of 4, EutraNetworks and parameter plmn"dentity is

confi!ured.* #t least one instance of 4, EutranFrequency and parameter earfcnDlis

confi!ured.

0.1.2 Acti/atin)

The followin! actions ha"e to 'e performed for acti"ation7

Confi!ure which -*;TR# nei!h'or frequencies are to 'e used for redirection to

T-. #ll5 or a su'set of5 the e>istin! instances of 4, EutranFreqRelation can

'e selected. The parameter EutranFreqRelation**redirectionOrder needs

to 'e set in the ran!e of 1..= for at least one instance. 8-*;TR# frequenciesconfi!ured with redirectionOrder1 is listed first in the RRC Connection

Release messa!e. -*;TR# frequencies with redirectionOrder6 are notincluded in the RRC Connection Release messa!e.9

Turn on the feature Release with Redirect to T- in the ;TR#N cells where

o"erlappin! T- co"era!e e>ists. This is done '( settin! the parameter

%tranCell**releaseRedirect to ?-;TR#?. In case feature FAJ 121 2'685

%requenc( priorit( at RRC Connection release shall 'e acti"ated in parallel withthis feature set parameter releaseRedirect to ?;TR#N<-;TR#?.

-na'le selected tri!!erin! points for the cells where the feature is turned on.

This is done '( confi!urin! tri!!er parameters within%tranCell**releaseRedirectEutra$riggers .

Decide if detection of co"era!e or load redirection from T- shall 'e acti"ated

or deacti"ated in RNC throu!h RncFunction**robustRwrEutraEnabled .

,rder and install the FAJ 121 21747 Release with Redirect to T-. The license

ke( is7 (>( 40' 0127 .

#cti"ate the feature on RNC le"el with parameter featureState for the

RncFeature instance with desi!nation ReleaseRedirectteJ.

Note%

This feature has one license per RNC.

%or the confi!uration of Release with Redirect to T- o"er Iur5 the followin!

applies per Iur link7

Redirection to -*;TR# is possi'le if the DRNC sends -*;TR# nei!h'or

information to the &RNC7

o %or Iur ink with 'oth &RNC and DRNC from -ricsson7 set

DRNC parameter 4, Iurink eutraNeighborReportSrnc to

"alue ?,N?.

o %or Iur ink with -ricsson &RNC 'ut other "endors DRNC7

Check that the DRNC transfer -*;TR# frequenc( nei!h'or

information to the &RNC. The information needed is included in



I- ANei!h'orin! -*;TR# Cell InformationA in the RN&#messa!es sent at radio link setup and radio link addition. If theDRNC does not send this information do not ena'le redirectionto -*;TR# o"er Iur.

o %or Iur ink with other "endors &RNC 'ut -ricsson DRNC7 set

DRNC parameter 4, Iurink eutraNeighborReportSrnc to

"alue ?,%%?.

-na'le redirection to -*;TR# o"er an Iur link '( doin! the followin!

confi!uration7

o Redirection o"er Iur is ena'led '( settin! 4, Iurink

releaseRedirect to "alue ?-;TR#? or ?;TR#N<-;TR#?.

o -na'le selected tri!!erin! points o"er the Iur link. This is done

'( confi!urin! the tri!!er parameters within 4, Iurink

releaseRedirectEutra$riggers .

In a multi*operator CN5 when the feature 4,CN 8FAJ 121 9749 shall 'e

acti"e simultaneousl( with the feature Release with Redirect to T-5 thefollowin! applies7

If feature 4,CN is acti"e and feature Release with Redirect to T-

shall 'e acti"ated7

o Confi!ure 4, -utraNetwork and parameter plmn"dentity.

o Confi!ure for each CN operator the -utraNetworks that areapplica'le for redirection. This is done '( 4, Cn,peratoriphoNetworksRefsEutra and5 if applica'le5 4,

-utra%reqRelation barredCnOperatorRef. If separate

o'ser"a'ilit( per CN operator is wanted confi!ure 4,

Cn,perator cnOperator"nde-.

o #cti"ate Release with Redirect to T-.

If feature Release with Redirect to T- is acti"e and feature 4,CN

shall 'e acti"ated7

o Disa'le &hared Network &upport if acti"e.

o reconditions7 Confi!ure 4,CN. Confi!ure 4, Cn,perator

iphoNetworksRefsEutra5 4, -utra%reqRelation

barredCnOperatorRefand 4, Cn,perator cnOperator"nde-.

o #cti"ate 4,CN.

In a shared network5 when the feature &hared Network &upport 8FAJ 121

2469 shall 'e acti"e simultaneousl( with the feature Release with Redirect toT-5 the followin! applies7

If feature &hared Network &upport is acti"e and feature Release with

Redirect to T- shall 'e acti"ated7



o Confi!ure 4, -utraNetwork and parameter plmn"dentity.

o Confi!ure 4, -utraNetwork and parameter

alias#lmn"dentities.

o #cti"ate Release with Redirect to T-.

If feature Release with Redirect to T- is acti"e and feature &hared

Network &upport shall 'e acti"ated7

o Disa'le 4,CN if acti"e.

o Confi!ure 4, -utraNetwork and parameter

alias#lmn"dentities.

o #cti"ate &hared Network &upport.

4ore information a'out licenses can 'e found in icenses and )ardware#cti"ation Codes.

7.2Deacti!ating the Feature

0.2.1 Preconditions

There are no preconditions for deacti"ation.

0.2.2 Deacti/atin)

The followin! actions are performed for deacti"ation7

Deacti"ate the feature on RNC le"el with parameter featureState for

the RncFeature instance with desi!nation ReleaseRedirectteJ.

Deacti"ate the feature in selected cells '( settin! parameter 4, ;tran

Cell releaseRedirect to ?,%%?.

Deacti"ate the feature in selected DRNC '( settin! the parameter 4,

Iurink releaseRedirect to ?,%%?. Disa'le redirection to T- for

specific DRNC cells '( not confi!urin! -*;TR# nei!h'or frequencies inthe cells.

B( usin! the "alue ?;TR#N? instead of ?,%%? for parameter

releaseRedirect the redirection to T- is deacti"ated5 'ut feature

FAJ 121 2'685 %requenc( priorit( at RRC Connection release5 is still

acti"ated.

hen the feature is deacti"ated5 Release with Redirect to T- will not 'e

tri!!ered.

It is also possi'le to disa'le the tri!!erin! of redirection to T- '( settin! all

tri!!ers points to ?,%%? or '( settin! "alue of 4, -utran%reqRelationredirectionOrder6 for all -*;TR# frequencies confi!ured in the cell.

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7.3)ngineering ,uidelines

This section pro"ides information a'out tunin! and practical en!ineerin!aspects when deplo(in! Release with Redirect to T-.

0.3.1 Out of .er/ice A/oidance

It is recommended to ha"e T- co"era!e in the entire cell to acti"ate Releasewith Redirect to T-. In case of unsuccessful redirections to T-5 the ;- will'eha"e accordin! to 3 T& 2+.331 and mi!ht 'e out of reach for aconsidera'le time 'efore returnin! to access in an( suita'le cell.

The tri!!er point csFallbackCsRelease preempts an on!oin! &*session.

;sin! this tri!!er in areas with uncertain T- co"era!e could 'e moredistur'in! to the end user than the other tri!!ers. ith this tri!!er the &*session can ha"e on!oin! acti"ities which are interrupted durin! a failed

redirection. -"en if the C& %all'ack ;- ori!inall( had T- co"era!e 'efore

arri"in! in CD4#5 mo'ilit( could ha"e chan!ed this. Tri!!er normalRelease

means that the connection is to 'e released an(wa( and a failed redirectionis less likel( to 'e noticed '( the end user.

To reduce the out of ser"ice time it is recommended that ;-s support the3 Release*16 CR +1035 RRC Connection Release7 &earch time for -*;TR#si!naled frequencies. ith this CR the out of ser"ice time when searchin! fora suita'le -*;TR# cell is limited to7

2a-imum search time 5 N ' 6 seconds

here * N is the Num'er of -*;TR# frequencies listed in ?I- -*;TR# Tar!et

Info?5 and $ is the num'er of seconds allowed to find a suita'le cell on an(frequenc( of that R#T.

ith for e>ample 2 frequencies sent to the ;- in the RRC Connection Releasemessa!e5 the ma>imum time is seconds when the CR is supported.

0.3.2 A/oidance of "epeated Inter"A* "edirections

hen a ;- is redirected to T- and finds a suita'le T- cell 'ut the T- radioco"era!e is 'ad5 the T- R#N can redirect the ;- 'ack to CD4# R#N. If an

ena'led redirect tri!!er occurs in CD4# R#N5 another attempt to redirectto T- is initiated5 and the repeated redirections ma( continue.

,ptimie parameter settin!s in -*;TR# to minimie the risk. If usin!

the same suita'le cell thresholds * for campin! in -*;TR# O as the

threshold for when to redirect the ;- to ;TR#N5 a ;- will not accessT- when the co"era!e is 'ad enou!h for tri!!erin! a redirection 'ack

to ;TR#N.

If the T- network supports redirect to CD4# R#N for other reasons

than C& %all'ack5 then consider usin! the CD4# R#N mechanism todetect if a ;- is redirected to CD4# R#N due to 'ad co"era!e or

load in -*;TR#5 see Ro!ustness )u::ort &ection 2.2..To acti"ate or deacti"ate the detection mechanism for redirect fromT-5 use parameter RncFunction**robustRwrEutraEnabled .

# ;- that is offloaded from T- and then setups a connection in CD4#should prefera'l( not return immediatel( to T-. # new RNC parameter



ando!er**blockRwrEutra$ime is introduced with the IR#T ,ffload from T-

feature 8FAJ 121 '427 95 to limit the returns to T- when T- has hi!h loadand R#Bs are successfull( setup in CD4#. hile this timer is not (ete>pired5 the feature Release*with*Redirect to T- is inhi'ited for this ;-5durin! a predefined time. hen the FAJ 121 '5887 T- Cell ReselectionDedicated riorities is acti"ated and confi!ured to pre"ent ;- from

reselectin! T- cells after T- ,ffload5 theRncFunction**offloadDedic#rioEutra$ime is used instead.

Reerence -ist

1 RR( s:eci#ication5 3 T& 2+.331

2 RA%A s:eci#ication5 3 T& 2+.$13

3 () #all!ac* in E)5 3 T& 23.202

$ RA%2 Release+9 (R 4222 (lari#ication o# the re+Redirection in#o setting a#ter theredirection #ro E+$TRA5 3 R2*11$0$

+ (hannel )witching5 =2E1++3*)&D 161 62

-dle ode and (oon (hannel .ehaior 5 01E1++3*)&D 161 62

0 () Fall!ac* to ?ERA% and $TRA% 5 06E1++3*)&C 16+ +6E1

= (oerage+Triggered 3(A )ession (ontinuit" 5 =2E1++3*)&C 16+ +6E1

@ RA%2 Release+9 (R 5026 -ntroduction o# a ()F. -ndicator in RR( (onnection Re/ue3 R2*1231@

16 RA%2 Release+10 (R 517' RR( (onnection Release@ )earch tie #or E+$TRA signal#re/uencies5 3 R2*12$3$

11 )hared %etwor* 5 16=E1++3*)&D 161 62

Cop(ri!htP -ricsson #B 2612O261$. #ll ri!hts reser"ed. No part of this document ma( 'e reproduceform without the written permission of the cop(ri!ht owner.

DisclaimerThe contents of this document are su'Lect to re"ision without notice due to continued pro!rmethodolo!(5 desi!n and manufacturin!. -ricsson shall ha"e no lia'ilit( for an( error or da

an( kind resultin! from the use of this document.

Trademark ist#ll trademarks mentioned herein are the propert( of their respecti"e owners. These are sho

the document Trademark Information.

"elease

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