Transcript
Re l e a s ewi t hRe d i r e c t t oL T E Co n t e n t s 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 TT- FAJ 121 2174 feature 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 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 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 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 16105 refer to Idle 4ode and Common Channel Beha"ior &hared Network &upport FAJ 121 2465 2465 refer to &hared Network. Network.
1 . 2Benefts Release with Redirect to T- is an inter*R#T mo'ilit( function that pro"ides 'asic mo'ilit( for an T-*capa'le T-*capa'le ;- from CD4# to T-. Redirection to T- is controlled '( the network and can '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-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 Tdue 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! RRC Connection 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-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 network 8parameter 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 home 4N*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 to include in the Release with Redirect messa!e. In case no -*;TR# frequencies are a"aila'le5 no redirection 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 situation as when a non*T- capa'le ;- is released to Idle. The cause "alues for the Iu Release Command 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 same situation 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 'e acti"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-pects that there is T- co"era!e5 since redirection is done without an( precedin! T- measurements. This means that in areas with uncertain Tco"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 of failure in findin! a suita'le T- cell. To a"oid these failures and the correspondin! out of ser"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 'ad co"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#B has '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'ack5 the detection mechanism requires correct usa!e '( the ;- of the I- ?re*Redirection info? and that the ;- supports the R#N2 CR $222 8R2+114674 ,(lari#ication o# the re+Redirection in#o setting a#ter the redirection #ro E+$TRA. If the CR $222 is not supported5 the ;- can erroneousl( appear to 'e redirected from T-. In this case the onl( tri!!er that can occur is normalRelease . If the ;- is "er( acti"e5 neither tri!!er normalRelease nor Cell Reselection to T- in Idle or ;R#<C) mode can happe n. If that is common it can 'e 'eneficial to disa'le the Ro'ustness &upport. 2.2.0 Adaptation of "elease wit, "edirect to #*+ after Incomin) I"A* Offload from #*+ # ;- that arri"es in ;TR#N with IR#T ,ffload from T- should not 'e sent 'ack to T- directl( to allow the load in the -*;TR# Cell to normalie. Therefore all tri!!ers for Release with Redirect to T- are 'locked for a time of blockRwrEutra$ime 84, ando!er 9 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 is acti"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$ime . 2.2.= Adaptation of "elease wit, "edirect to #*+ after Incomin) I"A* (O due to &o/era)e
# ;- that arri"es with IR#T), is assumed to do so due to insufficient T- co"era!e and all tri!!ers for Release with Redirect to T- are 'locked for the lifetime of the connection. This handlin! is applied for7
Incomin! &R:CC from T- 8C& onl(9
Incomin! &R:CC for :oice and Data from T-
Incomin! &), from T-
Incomin! C&), from &4
Note% Release with Redirect to T- is not 'locked after an incomin! CN)),.
3Parameters This section descri'es parameters introduced '( Release with redirect to T- and parameters affected '( acti"atin! the feature.
3 . 1Introduced
Parameters
This section descri'es all parameters that the operator can confi!ure to control CD4# R#N FAJ 121 2174 Release with Redirect to T-. %urther parameter information can 'e found in Radio Network arameters.
4, ;tranCell releaseRedirect Indicates if a ;- is redirected at RRC Connection Release. #pplica'le when this ;tran cell is the 'est in the acti"e set. If the "alue is ,%%5 no redirection takes place. If the "alue is -;TR# or ;TR#N<-;TR#5 redirection to -*;TR# can take place for -*;TR# capa'le ;-s.
4, Iurink releaseRedirect Indicates if a ;- is redirected at RRC Connection Release. #pplica'le when the ;- has a DRNC cell as the 'est cell in its acti"e set. If the "alue is ,%%5 no redirection takes place. If the "alue is -;TR# or ;TR#N<-;TR#5 redirection to -*;TR# can take place for -*;TR# capa'le ;-.
4, ;tranCell releaseRedirectEutra$riggers Indicates the tri!!er points where a ;- shall 'e redirected to -*;TR# in case the 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 the feature 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$o%ra7 &ince C-<%#C) state is not used o"er Iur the "alue of this parameter will 'e treated as ,%% r e!ardless of its actual "alue.
o
fastDormancy7 RR to T- at %ast Dormanc(.
o
normalRelease7 RR to T- at normal release.
o
csFallbackDch$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!e 6..= . :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 re direction 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 -ricsson RNC use dumm( "aria'les for -*;TR# cell identities when transferrin! nei!h'or information 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 $. -ach -*;TR# network shall 'e identified '( its 4N identit(. The 4N identit( information is con"e(ed o"er Iur when nei!h'or cells and frequencies are reported. This parameter is used for filterin! of re direction tar!et frequencies in case feature 4,CN or feature &hared Network &upport is ena'led.
4, -utraNetwork alias#lmn"dentities ist of alias 4N identities for the selecti"e redirection feature. hen the feature Release with Redirect to T- is acti"ated5 ;-s with home 4N*id equal to one of these alias 4N*ids will 'e redirected to the frequencies of this -* ;TR# network. ,nl( used if ReleaseRedirect+te in 4, RncFeature is acti"ated5 and &hared Network &upport is ena'led.
4, Cn,perator iphoNetworkRefsEutran Defines the -*;TR# networks to which a ;- re!istered in this CN is allowed to perform a Release with redirect. ;sed '( the 4,CN feature to filter the -*;TR# frequencies allowed for Release with redirect. ,nl( used if feature 4,CN5 descri'ed in &hared Network5 is ena'led.
4, Cn,perator CnOperator"nde- ;sed to distin!uish 'etween CN operators. The inde> represents one CN operator when the feature 4,CN5 descri'ed in &hared Network5 is ena'led. If the "alue of 4, Cn,perator CnOperator"ndeis ?6? no monitorin! of redirection to -*;TR# per CN operator is done. ,nl( used if feature 4,CN5 descri'ed in &hared Network5 is ena'led. 4, -utra%reqRelation barredCnOperatorRef Defines that the CN operator5 pointed out '( this parameter5 is not allowed to use this -utra%requenc(Relation. ;sed '( the Nri4ocn feature to filter the -* ;TR# frequencies allowed for Release with redirect to T-. ,nl( used if feature 4,CN5 descri'ed in &hared Network5 is ena'led.
3 . 2Parameters
range and deault !alues
Ta!le 1 :erator araeters
Parameter Name %tranCell**releaseRedirect "ur+ink**releaseRedirect %tranCell**releaseRedirectEutra$rigger s
Default 0alue
0alue ran)e
,%%
,%%5 -;TR#5 ;TR#N5 ;TR#N<-;TR#
,%%
,%%5 -;TR#5 ;TR#N5 ;TR#N<-;TR#
,%% for csFallbackCsRelease
,N or ,%%
mem'ers supported * csFallbackCsRelease * csFallbackDch$oFach * fach$o%ra * fastDormancy * normalRelease * dch$oFach
5 csFallbackDch$oFach 5 Dch$oFach
"ur+ink**releaseRedirectEutra$riggers mem'ers supported * csFallbackCsRelease * csFallbackDch$oFach * fach$o%ra * fastDormancy * normalRelease * dch$oFach
,%% for csFallbackCsRelease 5 csFallbackDch$oFach 5 Dch$oFach
,N for fach$o%ra5 fastDormancy5 normalRelease ,N or ,%%
,N for fastDormancy 5 normalRelease
Note7 fach$o%ra &ince C-<%#C) state is not used o"er Iur the "alue of this parameter will 'e treated as ,%% re!ardless of its actual "alue EutranFreqRelation**redirectionOrder
6
6..=
TR;-
TR;- or %#&-
"ur+ink**eutraNeighborReportSrnc
,%%
,N or ,%%
EutraNetwork**plmn"dentity
nEa
F4CCG F4NCG
EutraNetwork**alias#lmn"dentities
nEa
6..$
6
6..$
CnOperator**iphoNetworkRefsEutran
nEa
nEa
EutraFreqRelation**barredCnOperatorRef
nEa
nEa
RncFunction**robustRwrEutraEnabled
CnOperator**CnOperator"nde-
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-ample at transitions from DC) to %#C) or ;R#5 tri!!ered '( inacti"it( or fast*dormanc(. # ;- 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$ime is introduced with the IR#T ,ffload from T- feature 8FAJ 121 '427 95 to limit the returns to T- when T- has hi!h load and R#Bs are successfull( setup in CD4#. hile this timer is not (et e>pired5 the feature Release*with*Redirect to T- is inhi'ited for this ;-5 durin! a predefined time.
To support selecti"e redirection usin! the feature &hared Network &upport5 the parameter seloSup in 4, ando!er must 'e ena'led. Release ith Redirect can 'e pre"ented for some class of su'scri'ers with the help of feature &u'scri'er 'ased mo'ilit( usin! &ID 8FAJ 121 '6'7 9. It allows the RNC to differentiate 'eha"ior 'ased on the su'scri'er profile pro"ided '( the CN. # new parameter spid#re!entRwrEutra in 4, Subscr#rofile"dandling specifies the &u'scri'er rofile ID 8&ID9 "alues that are used to pre"ent Release ith Redirect. If the &ID "alue recei"ed for a ;- matches an( "alue in that parameter5 the Release ith Redirect is not allowed.
4Network Impact This section descri'es how the Release with redirect to T- feature impacts the network functions and capa'ilities.
4 . 1$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 the IR#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 the network confi!uration5 the traffic model as well as the T- network co"era!e and capacit(.
4 . 2Network
Perormance
This section pro"ides information on the impact of the feature on network performance. 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	 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$9
Introduces support for inter*workin! 'etween ;TR#N and -*;TR#.
5 . 2"#ected
Features
Dependin! on which tri!!er points are ena'led5 there are impacts on the distri'ution of ;- 'etween RRC states and transitions 'etween RRC states. This chan!e is "isi'le in the counters reflectin! these state transitions in ;TR#N cells where the Tredirection is performed. Ta'le 3 lists features that are affected '( the Release with redirect to T- feature. Ta!le ' A##ected Features Feature
Description
;TR#N Re!istration #rea )andlin! 8%#H 121 hen the fach$o%ra tri!!er are turned ,N the T-*capa'le ;- is not $609 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
5 . 3Related
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 in case the conditions for redirectin! the ;- to -*;TR# are fulfilled.
Features
The feature %requenc( riorit( at Connection Release 8FAJ 121 2'689 can also perform redirection at release of the connection. hen Release with Redirect to Tand %requenc( riorit( at Connection Release are ena'led at the same time in a cell5 the 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 to T-. ,nl( the %requenc( riorit( at Co nnection Release is e"aluated for a non* T- capa'le ;-.
The feature &u'scri'er 'ased mo'ilit( usin! &ID 8FAJ 121 '6'7 9 can 'e used to pre"ent Release ith Redirect for users with certain &u'scri'er rofile IDs5 for e>ample users without T- su'scription. %or more information a'out &u'scri'er 'ased mo'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 functions affected '( 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 with the Release with redirect to T- feature.
6 . 1*PIs The feature Release with Redirect to T- determines when a C& fall'ack from Toccurs5 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 () of the counter matches the "alue 4, Cn,perator cnOperator"nde-5 for e>ample pmRedirect,ttemptsEutra./0 . hen a redirection to T- is done5 there is some impact to e>istin! counters that are stepped '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 the R#N# Iu Release Request is A;ser Inacti"it(A. If the same Channel &witch performs a redirection 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 'e acti"ated.
;tranCell counter pm$otNoRrcConnReqCsfb"nd counts the total num'er of RRC Connection Request messa!es that included the I- C&%B IndicationJ5 not includin! retransmissions. Incremented '( 1 per connection when the RNC recei"es an RRC Connection Request messa!e that includes the I- C&%B IndicationJ from the ;- with an( -sta'lishment Cause. ;tranCell counter pmNo+oadSharingRrcConnCsfb"nd counts the total num'er of con"ersational 8emer!enc(5 ori!inatin! K terminatin!9 load sharin! RRC connection attempts5 for ;-s that included the I- C&%B IndicationJ in the RRC Connection Request. Incremented '( 1 per connection when the RNC sends a RRC Connection ReLect messa!e to a ;- usin! the C& ser"ice5 'ecause another cell 8frequenc(9 has 'een selected '( oad &harin!5 if the ;- included the I- C&%B IndicationJ in the RRC Connection Request. ;tranCell counter pm$otNoRrcConnReqCsfb"ndSucc counts the total num'er of successful RRC Connection Requests for which the ;- includes the I- C&%B IndicationJ. Incremented '( 1 when the RNC recei"es an RRC Connection &etup Complete messa!e indicatin! that the RRC connection is considered to 'e successfull( esta'lished5 for a ;- that includes the I- C&%B IndicationJ at RRC esta'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&%B IndicationJ at RRC esta'lishment. ,nl( stepped for call setup fro m idle. Incremented '( 1 in the 'est cell in the acti"e set for each s(stem*initiated release 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'lishment and 'efore R#B #ssi!nment Request. # s(stem*initiated release can 'e tri!!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 Arelease causeA set to an(thin! other than ANormal ReleaseA5 A&uccessful RelocationA5 AResource ,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 RelocationA5 AResource ,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 setup towards 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 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'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 Arelease causeA set to ANormal ReleaseA5 A&uccessful RelocationA5 AResource ,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 ANormal ReleaseA5 A&uccessful RelocationA5 AResource ,ptimisation RelocationA5 or A;ser Inacti"it(AM * a R#B #ssi!nment Request messa!e with the I- ?R#Bs to 'e setup or modified? 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 Request messa!e from the C& CN with R#Bs to 'e set up5 after the confi!uration is selected 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&%B IndicationJ in the RRC Connection Request 'ut are still considered to ha"e done a C&%B from -*;TR# since7 *the ;- is -*;TR# capa'le *the ;- did not include the I- pre*redirection info 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 when the RNC recei"es a R#N# R#B #ssi!nment Request messa!e from the C& CN with R#Bs to 'e set up5 when the confi!uration is selected 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&%B IndicationJ in the RRC Connection Request. Incremented '( 1 in the &RNC after sendin! a R#N# R#B #ssi!nment Response 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&%B IndicationJ in the RRC Connection Request 'ut are still considered to ha"e done a 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 Response 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#. 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$
E3EN$1#,R,21CSFB
arameter C&%B pro"ides o'ser"a'ilit( of the esta'lishment of the first &peech Call when a ;- has arri"ed from T- due to C& %all'ack 8C&%B9. The indication can 'e set after a C&%B at Call &etup %ailure and at R#B -sta'lishment of the first C& R#B. In all other situations N,istin! instances of 4, EutranFreqRelation can 'e selected. The parameter EutranFreqRelation**redirectionOrder needs to 'e set in the ran!e of 1..= for at least one instance. 8-*;TR# frequencies confi!ured with redirectionOrder 1 is listed first in the RRC Connection Release messa!e. -*;TR# frequencies with redirectionOrder 6 are not included in the RRC Connection Release messa!e.9 Turn on the feature Release with Redirect to T- in the ;TR#N cells where o"erlappin! T- co"era!e e>ists. This is done '( settin! the parameter %tranCell**releaseRedirect to ?-;TR#?. In case feature FAJ 121 2'685 %requenc( priorit( at RRC Connection release shall 'e acti"ated in parallel with this feature set parameter releaseRedirect to ?;TR#N<-;TR#?. -na'le selected tri!!erin! points for the cells where the feature is turned on. This is done '( confi!urin! tri!!er parameters within %tranCell**releaseRedirectEutra$riggers . Decide if detection of co"era!e or load re direction 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 the DRNC does not send this information do not ena'le redirection to -*;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 the followin! applies7
If feature 4,CN is acti"e and feature Release with Redirect to Tshall 'e acti"ated7 o
Confi!ure 4, -utraNetwork and parameter plmn"dentity .
o
Confi!ure for each CN operator the -utraNetworks that are applica'le for redirection. This is done '( 4, Cn,perator iphoNetworksRefsEutra 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 to T-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 in the 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%reqRelation redirectionOrder 6 for all -*;TR# frequencies confi!ured in the cell.
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 Release with 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 a considera'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 more distur'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 redirection is less likel( to 'e noticed '( the end user. To reduce the out of ser"ice time it is recommended that ;-s suppor t the 3 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! for a 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 Release messa!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- radio co"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 redirect to 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 access T- 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 to detect 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 from T-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$ime is introduced with the IR#T ,ffload from Tfeature 8FAJ 121 '427 95 to limit the returns to T- when T- has hi!h load and R#Bs are successfull( setup in CD4#. hile this timer is not (et e>pired5 the feature Release*with*Redirect to T- is inhi'ited for this ;-5 durin! a predefined time. hen the FAJ 121 '5887 T- Cell Reselection Dedicated riorities is acti"ated and confi!ured to pre"ent ;- from reselectin! T- cells after T- ,ffload5 the RncFunction**offloadDedic#rioEutra$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 the redirection #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 $TRA% 5 06E1++3*)&C 16+ +6E1 = (oerage+Triggered 3(A )ession (ontinuit" 5 =2E1++3*)&C 16+ +6E1 @ RA%2 Release+9 (R 5026 -ntroduction o# a ()F. -ndicator in RR( (onnection Re/ue 3 R2*1231@ 16 RA%2 Release+10 (R 517' RR( (onnection Release@ )earch tie #or E+$TRA signal #re/uencies5 3 R2*12$3$ 11 )hared %etwor* 5 16=E1++3*)&D 161 62
Cop(ri!ht
P -ricsson #B 2612O261$. #ll ri!hts reser"ed. No part of this document ma( 'e reproduce form without the written permission of the cop(ri!ht owner.
Disclaimer
The contents of this document are su'Lect to re"ision without notice due to continued pro!r methodolo!(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.
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