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Section 8Radio Link Failure Analysis
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Section )*ecti+es
Describe Radio Link Failure (RLF) Procedures.Explain how to Analyze RLF Lo sDescribe RLF !ase "tudiesDescribe #P$ $%pact due to RLF
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RLF Procedures +er+ie-
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Radio Link Failure /RLF0 +er+ie-
urin1 L"' acti+e data session RRC is inRRC3C !!'C"' State
#n RRC3C !!'C"' State $' can declare RLFunder +arious conditions
"o Restore t4e RRC Connection $' #nitiates RLFReco+ery procedure
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64at is RLF and Reco+ery7
A $' in RRC Connected Mode 4as already esta)lis4ed Si1nalin1 Radio 9earers /i%e SR9: SR920 efault Radio 9earers /i%e R9s0 Security Conte;t is acti+ated%
64en a $' in RRC Connected Mode declares RLF RRC S4all< Stop all runnin1 timers e;cept ",2=
Reset Radio Resources for all R9s Release MAC RLC P CP P>Y Confi1urations in order to Suspend all
SR9s and R9s Security Conte;t is still acti+e
$' initiates RLF Reco+ery to resume SR9: and net-ork confi1uresSR92 & R9s%
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RLF Scenarios
Radio LinkFailure
2.RRC ConnectionRe-configuration failure
3.Handover Failure (HO
Target Cell AcquisitionFailure
!."L #$%sical La%er Failure
(#"CCH &L'R !)*
+.Hndover Failure (T3)+e, ir%- RACH Failure
.RLC /nrecovera0le'rror
1.#"C# ntegrit% c$eckfailure .4AC RACH #ro0le5
detection
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:%RLF< o-nlink P4ysical Layer Failure
& Additional fields not shown
Out-of-Sync indicati
T310 started
RLF declared
N310: n5
N311: n1
T310: 2000 ms
DR !ycle: "
radio frames
#$ estimates Do%nlin& radio lin& 'uality in terms of (D!!) *L$R + todetect (,ysical Layer FailureRLF is declared after:
– N310 Out-of-Sync indications (D!!) *L$R . / out and t,e
– T,e su se'uent e iry of T310 in t,e a sence of N311 4n-Syncindicators
= 2=== .=== ?=== 8=== :==== :2=== :.=== :?=== :8=== 2=====
2
.
?
8
:=
:2
:.
:?
:8
QoutQinP CC> 9L'R /B0 6
P CC> P>#C> 9L'R D :=B
* L $ R - + 0
Time ms
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#$ estimates Do%nlin& radio lin& 'uality in terms of (D!!) *L$R + todetect (,ysical Layer Failure
– N310 Out-of-Sync indications (D!!) *L$R . / out starts T310– T310 sto ed due to rece tion of N311 4n-Sync indicators (D!!)
*L$R / in– RLF not declared
Out-of-Sync indication
T310 started
T310 sto ed reco6ery
4n-Sync indication
N310: n5
N311: n1
T310: 2000 ms
DR !ycle: "radio frames
= 2=== .=== ?=== 8=== :==== :2=== :.=== :?=== :8=== 2=====
2
.
?
8
:=
:2
:.
:?
:8
QoutQinP CC> 9L'R /B0
P CC> 9L'R D :=B
*
L $ R - + 0
Time ms
o-nlink P4ysical Layer Failure Reco+ery
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2%RLF < RRC Connection Re confi1urationFailure
UE Evaluates all parameters of the RRC Connection
Reconfiguration message
UE eNodeB
alidation of RRC Connection
Reconfi1uration Failure
RLF
RRC Connection Reconfi1
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,%RLF < >ando+er Failure
RRC Connection Reconfiguration specifies Target eNodeB C-RNTI,
Radio Resource info, Dedicated RAC Info, !ecurit"Config # etc$
UE!ource
eNBTarget
eNB
Perform "ar1et e!ode9FreGuency AcGuisition andP4ysical Cell # Specified
9ut 'ncounters Failure
RLF
Measurement Report>ando+er ReGuest
>ando+er ReGuest AckRRC Connection Reconfi1
S! Status "ransfer
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.%RLF < >ando+er Failure /",=. ';piryRAC> Failure0
UE!ource
eNBTarget
eNB
Perform "ar1et e!ode9FreGuency AcGuisition andP4ysical Cell # Specified
RLF
Measurement Report>ando+er ReGuest
>ando+er ReGuest AckRRC Connection Reconfi1
S! Status "ransfer
M#9 and S#9 +er4ead Messa1es
RAC> Failure &",=. ';piry
",=.9e1ins
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",=.
RAC> pream)le transmissions
#$ declares RLF follo%in7 failure to successfullycom lete t,e ,ando6er %it,in T308
RLF declared
)ando6er Re'uested9c'uisitionSuccessfulR9!) started
6
(ream le Trans;a : 8
>ando+er Failure H ",=. ';piry
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;a Re-TT,res,old: <
UE eNB
6
6
6
6
66
Failure to send a s eci=c RL! (D# after attem tin7 ;a
Retransmissions causes RLF>
RLF isdeclared
(D# re-transmissions
1st (D#transmission
6
5%RLF < RLC Retransmission 'rror
RLF
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?%RLF < P CP #nte1rity C4eck Failure
All !ignaling %essages are &oth Ciphering and Integrit" protected
& Additional fields not shown
RRC 'DC'
Si1nalin1 #nte1rityprotection
Failure
RLF
#nte1rity Protection Failure
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(ream leTrans ;a : <R9-Res onseSi?e: sf3 3 ms
ream le senta7ain after 3@3 ms
if no res onse orac&oA
Failure to R9!) B%,en #LCDL data arri6es in !onnected state
causes RLF>
6
Rando5 Access
= ,= ?= E=
#$ in !onnectedstateeN* sto s7rants
RLF is declared
Random 9ccess isstarted
"ime /ms0
& a
t a / ) y
t e s
07e8 /L
"ata
@%RLF < MAC RAC> Pro)lem etection/Connected Mode< $L "ime Ali1nment "imer e;pired or RAC> Failure0
RLF
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RLF Reco+ery Procedure / : of 2 0
$' starts ",:: "imer and initiates Cell SelectionProcedure
After Successful Cell Selection Procedure /successfulM#9 decodin10 $' stops ",:: "imer and reads S#9sfrom P SC>$' #nitiates ",=: "imer & RRC Re esta)lis4mentprocedures and RRC Confi1ures lo-er layers toacti+ate SR9:SR92 and R9s are confi1ured upon recei+in1 RRCConnection Re confi1uration messa1e from ' $"RA!after RLF Reco+ery
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4f 9S Security ,as een acti6ated rior to RLF #$ remains in t,eRR! !onnected state
– Sus ends SR*1E releases SR*2 and DR*s– Tri77er reco6ery rocedures
4f 9S Security ,as not een acti6ated #$ transitions to RR! 4dlestate
Transition to RRC IDLEstate
RLF Declared, Cell Reselection
startedCell Reselectionsuccessful
Re-esta lis,ment successful
",::
Cell Reselection
",=:
Connection Reesta0lis$5ent
9R&!resu5es
Reselection and !onnection Re-esta lis,ment rocedures are used toreco6er from RLF
RLF Reco+ery Procedure / 2 of 2 0
9R&2 : "R&resu5es
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RLF Reco+ery Call flo-
UE eNB
Suspend SR9: & ReleaseSR92 R9s & initiateCell Selection Process
RLF
RRC Connection Re esta)lis4ment ReGuest ms1
RRC Connection Re esta)lis4ment
RRC Connection Re esta)lis4ment Complete
RRC Connection Re Confi1uration
RRC Connection Re Confi1uration Complete
ResumeSRB1ResumeSRB2 & DRB
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RLF Lo1 Analysis
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arious '+ents /: of 20
' '!"3L"'3RRC3RA # 3L#!I3FA#L$R'
"4is Counter indicates 4o- many times $' declared RLF since po-er up%
' '!"3L"'3RRC3"#M'R3S"A"$S
"imer alue indicates t4e remainin1 amount of time%
' '!"3L"'3RRC3!'63C'LL3#!
Cause indicates Cell Selection Re Selection or >ando+er
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arious '+ents /2 of 20
' '!"3L"'3RAC>3ACC'SS3S"AR"
RAC> Cause indicates -4at caused t4e $' to start RAC> Procedure
' '!"3L"'3RAC>3ACC'SS3R'S$L"
RAC> Result indicates -4et4er RAC> is a)orted successful or 4as pro)lem
' '!"3L"'3MAC3"#M'R
"imer "ype indicates -4et4er it is "imin1 Ad+ance /"A0 Random Access/RA0 Contention "imer or RAC> 9ack off "imer
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L"' ML: #nitial AcGuisition Results /=;9:@?0
"4is lo1 packet pro+ides information a)out eac4initial acGuisition attempt% #t is sent -4ene+er RRCreGuests initial acGuisition%
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L"' ML: Random Access ReGuest /=;9:?@0
Random Access ReGuest /MSJ:0 transmission isused )y $' to transmit PRAC> Pream)le and $'uses RA R!"# #dentifier
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L"' ML: Random Access Response /=;9:?80
Random Access Response /MSJ 20 Reporttransmitted on L SC> carries $' $plink "imin1
Ad+ance R!"# "ype and its +alue P$SC> Resourcesfor MSJ, "ransmission%
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L"' ML: $' #dentification Messa1e /=;9:?E0
$' #dentification Messa1e /MSJ ,0 carries t4e $'#dentifier and is transmitted usin1 P$SC>Resources in MSJ2 %
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L"' ML: Contention Resolution Ms1 /=;9:?A0
Contention Resolution Messa1e /MSJ .0 resol+est4e contention due to multiple $'s tryin1 to accesst4e system usin1 t4e same Random AccessResource%
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RRC Connection Re esta)lis4ment ReGuest/=;9=C=0
RRC Connection Re esta)lis4ment ReGuest is sent )yt4e $' to initiate RRC Connection Re esta)lis4ment%
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RRC Connection Re esta)lis4mentResponse /=;9=C=0
RRC Connection Re esta)lis4ment Response is sent)y t4e e!ode9 to esta)lis4 SR9:%
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RRC Connection Re esta)lis4ment Complete/=;9=C=0
$' sends RRC Connection Re esta)lis4ment Completemessa1e after successful SR9: Confi1uration %
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RRC Connection Re confi1uration /=;9=C=0
!et-ork sendsRRC ConnectionRe confi1uration
includin1 SR92Resources %
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RRC Connection Re confi1uration Complete/=;9=C=0
After Successful SR92 Confi1uration $' sends RRCConnection Re confi1uration Messa1e %
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L"' RLC $L AM ALL P $ /=;9=E20
"4is Packet is used f or lo11in1 all control and data AM P $s for SR9 as -ell as R9 sent on $L
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RLF Case Studies
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RLF Reco+ery /: of ,0
1. UE Received RRC Connection Reconfiguration (0xB0C0) @ 00:00:30:789UE i configured !it" U# $%C and &' #a er
*. UE +ec,ared R#- (01 08) @ 00:00:30:791 due to RRC ConnectionReconfiguration /a,idation -ai,ure (Rea on not ca tured in R#- Event)
3. UE nitiated R#- Recover and ucce fu,, ac2uired Ce,, d 397 (0xB17 )@ 00:00:30:88
. UE 4ent RRC Connection Ree ta5,i "6ent Re2ue t (0xB0C0) @00:00:00:9
. e odeB Re onded !it" RRC Connection Ree ta5,i "6ent 6e ageinc,uding 4RB1 Configuration (0xB0C0) @ 00:00:31:0
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RLF Reco+ery /2 of ,0
. %fter 4ucce fu, 4RB1 Configuration UE end RRCConnectionRee ta5,i "6entCo6 ,ete (0xB0C0) @ 00:00:31:0 1
7. e odeB Configure 4RB* and +RB t"roug" RRC ConnectionReconfiguration (0xB0C0) @ 00:00:31:133
8. %fter 4ucce fu, Reconfiguration of 4RB* and +RB UE end RRCConnection Reconfiguration Co6 ,ete $e age (0xB0C0) @ 00:00:31:137
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RLF Reco+ery /, of ,0
>"ML3Format3RLF3Reco+ery3Procedure
http://var/www/apps/conversion/tmp/scratch_7/RLF_Recovery_Procedure/COMPLETE_RLF_ReconfigurationFailure%20and%20RLF%20Recovery.htmlhttp://var/www/apps/conversion/tmp/scratch_7/RLF_Recovery_Procedure/COMPLETE_RLF_ReconfigurationFailure%20and%20RLF%20Recovery.html
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RLF < RRC Connection Reconfi1urationFailure /: of .0
1. UE Received RRC Connection Reconfiguration (0xB0C0) @ 0*:3*:13:3 0UE i configured !it" U# $%C and &' #a er
*. UE +ec,ared R#- (01 08) @ 0*:3*:13:3 3
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RLF < RRC Connection Reconfi1urationFailure /2 of .0Parameters
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RLF< RRC Connection Reconfi1urationFailure /. of .0
HT4L;For5at;RLF;RRC;Connection;Reconfiguration;Failure
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RLF< RAC> Pro)lem /: of ,0
1. UE Received 4 B* $e age !it" &R%C' Configuration (0xB0C0) @0 :00:*3: 10&rea65,e ran $ax ; n
*. UE U# +ata arriva, triggered contention 5a ed R%C' &rocedure . #oo< for E/E =# E=R%C'=%CCE44=4 %R @ 0 :00:38:730
3. UE ent &R%C' $ax &rea65,e @ 0 :00:38:707>71 >7**>730>738>7 *
. UE $%C #a er Rando6 %cce i6er ex ired (E/E =# E=$%C= $ER) @0 :00:38:730>7
. E/E =# E=R%C'=%CCE44=RE4U# ndicated R%C' "a ro5,e6 @0 :00:38:7
. E/E =# E=RRC=R%+ ?=# =-% #URE dec,ared @ 0 :00:38:7
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RLF< RAC> Pro)lem /2 of ,0
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RLF< RAC> Pro)lem /, of ,0
>"ML3Format3RLF3RAC>3Pro)lem
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RLF< >andoff Failure and S#9 ReadFailure /: of 50
1. UE Received RRC Connection Reconfiguration $e age fro6 4ource Ce,,+ ; 397 inc,uding $o5i,it Contro, nfo (0xB0C0) @ 0 : 9:38:*1*arget&" Ce,, + ; 11
*. -ro6 # E ##1 444 Re u,t it i o5 erved t"at UE fai,ed to %c2uire Ce,,+;11 @ 0 : 9:38:**8
3. UE 4tarted 30 ; 006 i6er E/E =# E=RRC= $ER=4 % U4@0 : 9:38:*3*
. UE 4to ed 30 at *6 E/E =# E=RRC= $ER=4 % U4@0 : 9:38:*3*
. E/E =# E='?=-% #URE i dec,ared 5 UE and R#- @ 0 : 9:38:*3*
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. UE +ec,ared 14
R#- E/E =# E=RRC=R%+ ?=# =-% #URE @0 : 9:38:*3* 7.UE %tte6 ted R#- Recover and RRC Connection Ree ta5,i "6ent
Re2ue t @ 0 : 9:38: *R#- Recover ried on arget &" Ce,, + ; 11
8. -ro6 # E ##1 444 Re u,t it i o5 erved t"at UE fai,ed to %c2uire Ce,,+;11 @ 0 : 9:38:**8
9. UE -ai,ed to read t"e 4 B nfor6ation on Ce,, + ; 11 E/E E =# E=RRC=4 B=RE%+=-% #URE @0 : 9:39:771
10. UE +ec,ared * nd R#- E/E =# E=RRC=R%+ ?=# =-% #URE @0 : 9:39:771
RLF< >andoff Failure & S#9 Read Failure /2 of 50
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RLF< >andoff Failure /, of 50
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RLF< >andoff Failure /. of 50
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RLF< >andoff Failure /5 of 50
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52 Qualcomm Proprie tary & Confidential MAY C !"A#! $%S% A! #!"'R!A"# !AL '(P R" C !"R LL' #!F RMA"# !
RLF< S#9 Read Failure durin1 RLFReco+ery
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5, Qualcomm Proprie tary & Confidential MAY C !"A#! $%S% A! #!"'R!A"# !AL '(P R" C !"R LL' #!F RMA"# !
RLF< >andoff Failure and S#9 Read Failure
>"ML3Format3RLF3>andoff3Failure3&3S#93Read3Failure
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5. Qualcomm Proprie tary & Confidential MAY C !"A#! $%S% A! #!"'R!A"# !AL '(P R" C !"R LL' #!F RMA"# !
RLF< Ma; RLC Retransmission Failure /: of 50
1. UE Received 4RB* and +RB1 Configuration t"roug" RRC ConnectionReconfiguration $e age @ 08:00:11:*80-or +RB U ,in< R#C 6axRetx "re "o,d ; t8
*. +uring U ,in< +ata ran fer R#C &+U 4e2uence u65er (4 ) 973 itran 6itted @ 08:01:11:8*
3. "e a6e 4 i Retran 6itted 8 ti6e 5a ed on 6axRetx "re "o,dconfiguration . R#C Retran 6i ion i done to recover t"e U# +ata
ran 6i ion -ai,ure . (# E R#C U# %$ %## &+U)
. Retran 6i ion i6e 4ta6 : 08:01:11:8 7>873>89 >9*1>9 >97*08:01:1*:017>0
. UE dec,ared R#- # E=RRC=R%+ ?=# =-% #URE @ 08:01:1*:0 1
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55 Qualcomm Proprie tary & Confidential MAY C !"A#! $%S% A! #!"'R!A"# !AL '(P R" C !"R LL' #!F RMA"# !
RLF< Ma; RLC Retransmission 'rror
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5? Qualcomm Proprie tary & Confidential MAY C !"A#! $%S% A! #!"'R!A"# !AL '(P R" C !"R LL' #!F RMA"# !
RLF< Ma; RLC Retransmission 'rror
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58 Qualcomm Proprie tary & Confidential MAY C !"A#! $%S% A! #!"'R!A"# !AL '(P R" C !"R LL' #!F RMA"# !
IP# #mpact
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5E Qualcomm Proprie tary & Confidential MAY C !"A#! $%S% A! #!"'R!A"# !AL '(P R" C !"R LL' #!F RMA"# !
P SC> "4rou14put #mpact due to RLF
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?= Qualcomm Proprie tary & Confidential MAY C !"A#! $%S% A! #!"'R!A"# !AL '(P R" C !"R LL' #!F RMA"# !
Lo- RSRP -4en RLF >appened
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?: Qualcomm Proprie tary & Confidential MAY C !"A#! $%S% A! #!"'R!A"# !AL '(P R" C !"R LL' #!F RMA"# !
Lo- S#!R -4en RLF >appened
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?2 Qualcomm Proprie tary & Confidential MAY C !"A#! $%S% A! #!"'R!A"# !AL '(P R" C !"R LL' #!F RMA"# !
64at did -e learn7
'hat is Radio Link Failure (RLF) and its Reco eryProcedure.Analysis o RLF Lo sRLF !ase "tudies#P$ $%pact due to RLF
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"est Plan aspects and performance metrics
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