radio link failure-pa2

8/18/2019 Radio Link Failure-PA2

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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



(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



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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RLF< S#9 Read Failure durin1 RLFReco+ery


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RLF< >andoff Failure and S#9 Read Failure

>"ML3Format3RLF3>andoff3Failure3&3S#93Read3Failure


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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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RLF< Ma; RLC Retransmission 'rror


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RLF< Ma; RLC Retransmission 'rror


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IP# #mpact


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P SC> "4rou14put #mpact due to RLF


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Lo- RSRP -4en RLF >appened


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Lo- S#!R -4en RLF >appened


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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

radio link failure-pa2

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