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8/18/2019 LTE Deep Concept Part1
1/26
LTE Deep ConceptExpert Preparation
Part-1 Yoyok Dwi [email protected]
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States in UTRAN, GERAN, E-UTRA
• The following transitions are spp
E-UTRARRC_COECTE
DCE!!_DC"
CE!!_#AC"
CE!!_PC"URA_PC"
UTRA_$D!EE-UTRA
RRC_$D!E
%&'_Conn(ct(d
%&'_$dl(%PR&_Pack(t_$d
(
%PR&_Pack(t_Tran)*(
#an!o$er
Reselection
Reselection
Connection Esta%lish&ent'Connection Release
Connection Esta%lish&ent'Connection Release
#an!o$er
CC( wit
h optional NACC
Reselection
CC(
CC(, Reselection
Connection Esta%lishConnection Release
LTE
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E)) * EC) States Transitions
EMM_Deregistered
ECM_Idle
Power On
Registration (Attach)
EMM_Registered
ECM_Connected
• Allocate S-TMSI
• Allocate IP address + default bearer • Authentication• Establish security context
• Release RRC + S1 connection
• Confiure !R" for #ain• e$% initiated &inacti'ity ti(er)
EMM_
EC
Release due to
Inactivit
• Acti'ate RRC + S1 connection
!ew Tra""icDeregistration (Detach)Change PLM!
• Release S-TMSI• Release IP addresses• *E MME or ,SS initiated
Ti#eout o" Periodic TA
$%date
• Release S-TMSI
• Release IP addresses
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Attach acce#t
!etach Attach reect
TA* Reect All %earer !eacti'ated
EMM-!ERE.ISTERE! EMM-RE.ISTERE!
EMM states in *E
Attach acce#tTA* Acce#t
!etach Attach reect
TA* Reect All %earer !eacti'ated
EMM-!ERE.ISTERE! EMM-RE.IST
EMM states in MME
)o%ilit+ )anage&ent States•Denition of &ain EPS )o%ilit+ )anage&ent states
• E''-DERE%$&TEREDo The UE is not reacha%le %+ a ))E
o UE context can still %e store! in the UE an! ))E
• E''-RE%$&TERED
/ UE enters to E))-Registere! with Attach or Trac.ing Area Up!ate proce!re
/ The UE location is .nown with accrac+ of the trac.ing area list
/ UE has at least one acti$e PDN connection
/ After !etach proce!re the state is change! to E))-DEREG/STERED
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RRC Established
RRC Released
ECM-I!0E ECM-C$$ECTE!
ECM states in *E
S1 Established
S1 Released
ECM-I!0E ECM-C$$E
ECM states in MME
Connection )anage&ent States•Denition of EPS Connection )anage&ent states
• EC'-$D!Eo No NAS signaling connection %etween UE an! networ. exists
o /n the E))-REG/STERED an! EC)-/DLE state, the UE shall perfor& TAU, Perio!ic TAU, SAnswer to paging for& ))E with Ser$ice UE an! ))E enter the EC)-C(NNECTED stat
connection is esta%lishe!• EC'-COECTED
o UE location is .nown in the ))E with an accrac+ of a ser$ing eNo!e1
o There exists a signaling connection %etween the UE an! the ))E
o The S2 release proce!re changes the state at %oth UE an! ))E fro& EC)-C(NNECTE
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Cell Search 32'45
&' P Pri#ar nchroniation ignal
(Ti#e*slot + ,re-uenc snchroniation
. Phsical cell id (/0&01) )
1' econdar nchroniation ignal
(,ra#e snchroniation
. Phsical Cell id grou% (&''&23) )
4' P5C6 7 Phsical 5roadcast Channel
&MI5 7 !0 syste( band2idth P,IC, confiuration)
8' DL Re"erence ignals
(Channel esti#ation + #easure#ents
e!ode5
$E
MI% 3 Master Infor(ation %loc4
P,IC, 3 Physical ,AR5 Indicator Channel
Re&7hph+
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Cell Search 34'45
9' PC,IC6 Phsical Control ,or#at Indicator Channel
&,o2 (any 6!M sy(bols &178) in the
beinnin of the sub-fra(e are for P!CC,)
2' PDCC6 Phsical Downlin: Control Channel
&Resource allocation for P!SC, )
;' PDC6 Phsical Downlin: hared Channel
&SI%s9 Cell lobal I! #ara(eters for cellselection : reselection ; )
e!ode5
$E
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Ran!o& Access 32'453' PRAC6 %rea#=le (A)
3' PRAC6 %rea#=le (C)
'
'
'
e!ode5$E
Challenge>
Se'eral *Es (ay send the sa(e #rea(ble< ,o2 to sol'e the
collision =
olution>
< contention resolution
(A 7&st rando# %rea#=le?)
(C 78rd rando# %rea#=le)
8 9: Ran!o& Access Prea&%le Signatres a$aila%leper Cell
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Ran!o& Access 34'45
@' PC,IC6 Phsical Control ,or#at Indicator Channel
&,o2 (any 6!M sy(bols &178) in thebeinnin of the sub-fra(e are for P!CC,)
&/' PDCC6 Phsical Downlin: Control Channel
(Resource allocation "or PDC6)
&&' PDC6 Phsical Downlin: hared Channel
(Rando# Access res%onse> ID o" the received
%rea#=le0 C*R!TI)e!ode5
$E
C-R$TI9 Cell Radio $et2or4 Te(#orary Identity
res#onse to RAC, Prea(ble on P!SC,
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Contention Resoltion for the /nitial Access
3' PRAC6 Prea#=le
&&' PDC6 Phsical Downlin: hared Channel
&1' P$C6 Phsical $%lin: hared Channel
(Rando# Access res%onse> ID o" received %rea#=le0
$L resources "or T?0 C*R!TI)
(RRC> RRC Connection Re-uest0 ?C*R!TI0
TMI or rando( nu(ber )
&8' PDC6 Phsical Downlin: hared Channel
(Contention Resolution0 C*R!TI + TMI or
rando( nu(ber )
e!ode5
$E
TMSI 3 Te(#orary Mobile SubscriberIdentity
8 UL grant ⇒ PUSC# resorces
se'eral *E 2ith sa(e
RAC, Prea(ble Sinature
⇒ ettin sa(e *0 rant
⇒ collision 2ith RRC
Connection Re>uest
All other *Es not rece
ans2er &TMS
→ restart Rando( A
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7hat are the Next Steps6
T+( random acc()) proc(d,r( i) ),cc())*,lly ni)+(d
(t )t(p)/
- RRC Conn(ction E)ta0li)+m(nt
- R(gi)tration
- UE-C )ignaling Attac+2
"ig+(r lay(r )ignaling -3 not )+own +(r(
$E
Now / a& connecte! so / can!ownloa! the we% pagefro& the /nternetwwwfastconnorg
e!od
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DL Trans&ission
1' P$CC6 Phsical $%lin: Control Channel (or P$C6)
&CBI based on !0 reference sinals (easure(ents)
8' PC,IC6 Phsical Control ,or#at Indicator Channel&,o2 (any sy(bols &178) in the beinnin of the
sub-fra(e are for P!CC,)
4' PDCC6 Phsical Downlin: Control Channel
&!0 assin(ent for P!SC,9 Modulation @ codin
resource bloc4s)
9' PDC6 Phsical Downlin: hared Channel
(user data initial trans#ission)
2' P$CC6 Phsical $%lin: Control Channel (or P$C6)
&ACB: $ACB for ,AR5)
;' PDC6 Phsical Downlin: hared Channel
&user data e'entual re-trans(ission)
&' DL Re"erence signals
e!ode5
$E
C5I 3 Channel 5uality Indicator
ACB 3 Ac4no2led(ent
$ACB 3 $eati'e ACB
,AR5 3 ,ybrid Auto(atic
Re#eat Re>uest
⇒ Channel Esti(ate : C5I
C5I a
d
P
8 Ph+sical Resorce Allocation
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UL Trans&ission&' P$CC6 Phsical $%lin: Control Channel (or P$C6)
&*0 schedulin re>uest)
1' $L ounding Re"erence ignal R
&used by $ode-% for channel de#endent schedulin)
8' $L De#odulation Re"erence ignal
&*0 channel esti(ation de(odulation li4e !PCC, in *MTS)
4' PDCC6 Phsical Downlin: Control Channel
&*0 rant / ca#acity allocation)
9' P$C6 Phsical $%lin: hared Channel
(user data < initial trans#ission)
2' P6lC6 Phsical 6ARB Indicator Channel
&ACB: $ACB for ,AR5)
;' P$C6 Phsical $%lin: hared Channel
&user data e'entual re-trans(ission)
e!ode5
$E
!PCC, 3 !edicate PhysicalControl Channel
ACB 3 Ac4no2led(ent
$ACB 3 $eati'e ACB,AR5 3 ,ybrid Auto(atic
Re#eat Re>uest
8 sche!ling re0est onl+ nee!e! for applications with ;oS li.e %
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/!le )o!e )o%ilit+
!l ! ( i
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LTE TDD 4=>> )#? 2st Carrier
LTE @DD B> )#? 34::=5
0TE Cell Reselection to 0o2er Priority 0TE 6re>uency
0Rxle$&eas 0Rxle$&in sNon/ntrsearch
0RxLe$)eas 3Ser$ingCell5 threshSer$Low0Rxle$&eas 3NonSer$ingCell5 0Rxle$&in/nter@ inter@r0ThrLinterTResEt
0Rxle$&eas 3NonSer$ingCell5 0Rxle$&in/nter@ inter@interTResEt
*E Preferred ca(#in on 0TE 1st Carrier
/!le )o!e F LTE ($er$iew
LTE TDD 4=>> )#? 4n! Carrier
A0) Priority /4
A0) Priority /5
A0) Priority /6
0TE Cell Reselection to ,iher Priority 0TE 6re>uency
0Rxle$&eas 0Rxle$&in sNon/ntrsearch
/!l ) !
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a d7m 0 d7m
c !1&
dd7m ( d7m
s/ntrasearch sNon/ntrsearch
inter@r0ThrL3@DD5
threshSr$Low0rxle$&in 3U
0rxle$&ininter@ 3
/!le )o!e
• Cell Selection * Reselection
7hen RSRP -94 !1&
UE starts to &easreintra-fre0 neigh%ors
Reselection to other intra LTE cell willhappen"2 7hen neigh%or is =!1 %etter than
ser$ing4 @or a ti&e
LNCEL"tReselEtr 2s= AND &ore than 2 s has elapse! since
the UE ca&pe! in the crrrent cell
7hen RSRP -2>9 !1& UEstarts to &easre on LTE
3/nter@re0enc+ Neigh%or5
Reselection to LTE /nter cell willhappen"2 7hen ser$ing is %elow -!!1&
AND LTE neigh%orHs RSRP is%etter than -c !1&
4 @or a ti&e/R@/)"intertResEt 2s
= AND &ore than 2 s has elapse!since the UE ca&pe! in thecrrent cell
c !1&
inter@r0ThrL3TDD5
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Connecte! )o!e )o%ilit+
C t ! ) ! LTE ( i
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TDD
TDD
/ntra Cell #an!o$er
Connecte! )o!e F LTE ($er$iew
@DD
TDD TDD
TDD TDD
@DD@DD@DD
Ear*cnDl /89:6:
Ear*cnDl /;558
Ear*cnDl /89;::
/nter @re0enc+ #an!o$er 3/@#(5
Connecte! )o!e
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Connecte! )o!e
Con!ential
• /ntra an! /nter-fre0enc+ #an!o$ers
a d7m 0 d7m c d7m d d7m ( d7
* d7m g d7m
T+r()+old1
T+r()+old;a
T+r()+old;$nt(r#r(< T+r()+old8$nt(r#r(<
T+r()+old8a
T+r(T+r()+old8
+ d7mT+r()+old8a$nt(r#r(<
(nl+ Ser$ingCell)easre&ent
UE &easreintra @re0enc+Neigh%ors
UE stops to&easre inter@re0enc+Neigh%ors
Trigger" RSRP a%o$e Threshol!xa
Trigger" RSRP %elow Threshol!x
UE &easreinter @re0enc+Neigh%ors
UE perfor& #(Neigh%or
UE perfor& #(to inter @re0Neigh%or
LTE RR)" Power Control 32'95
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LTE RR)" Power Control 32'95
•Downlink/
/ There is no adapti=( or dynamic pow(r control in D! %t )(mi-)tatic pow(r)(tting
/ eNo!e1 gi$es >at pow(r )p(ctral d(n)ity d7m?PR72 for the sche!le!resorces"
• The power for all the PR1s is the sa&e
• /f there are PR1s not sche!le! that power is not se! %t the power of there&aining sche!le! PR1s !oesnHt change"
/ Total Tx power is &ax when all PR1s are sche!le! /f onl+ 2'4 of thePR1s are sche!le! the Tx power is 2'4 of the Tx power &ax 3 ie Txpower &ax -=!15
/ Se&i-static" PDSC# power can %e a!Iste! $ia (*) para&eters
• Cell Power Re!ction le$el CELLJP7RJRED K>2> !1 attenation in >2 !1steps
$mpro=( c(ll (dg( 0(+a=io,r r(d,c( int(r-c(ll int(r*(r(nc( pow(con),mption
Power Control 34'95 Downlin. Power 1oosting for Control Ch
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Power Control 34'95 Downlin. Power 1oosting for Control Ch
• (
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Uplink/
• UL PC is a &ix of Op(n !oop Pow(r Control * Clo)(d !oop Pow(r Control"
• Close! Loop PC co&ponent f3i5" )a.es se of fee!%ac. fro& the eN1 @ee!%ac. are TCP co&&an!s$ia PDCC# to instrct the UE to increase or !ecrease its Tx power
$mpro=( c(ll (dg( 0(+a=io,r r(d,c( int(r-c(ll int(r*(r(nc( and powcon),mption
• UL Power control is Slow power control"
/ No nee! for fast power control as in =G" ifUE Tx power was high it incre&ente! theco-channel for other UEs
/ /n LTE all UEs resorces are orthogonal infre0enc+ * ti&e
TPC" Trans&it Power Control
Pow(r Control 5?42
)}[()()()())((log10,min{)( _ 010
dBmi f i PL j j P i M P i P TF PUSCH PUSCH CMAX PUSCH +∆+⋅++= α
Power Control 3B'95
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Power Control 3B'95
Uplink cont.2/
• UL PC is a &ix of (pen Loop Power Control * Close! Loop Power Control"
• PC'AB" &ax UE Tx power accor!ing to UE power classM eg 4=!1& for class =
• 'PU&C"" allocate! PR1s The UE Tx Power is increase! proportionall+ to the of allocate! R1s
Re&aining ter&s of the for&la are per R1
• P:_PU&C"" eN1 recei$e! power per R1 when ass&ing path loss > !1 Depen!s on O
• / Path loss co&pensation factor Three $ales"
/ O >, no co&pensation of path loss
/ O 2, fll co&pensation of path loss 3con$entional co&pensation5
/ O Q > ,2 , fractional co&pensation• P!" DL Path loss calclate! %+ the UE
• D(lta_T#" increases the UE Tx power to achie$e the re0ire! S/NR when trans&itting a large n&%%its per RE /t lin.s the UE Tx power to the )CS
)}[()()()())((log10,min{)( _ 010
dBmi f i PL j j P i M P i P TF PUSCH PUSCH CMAX PUSCH +∆+⋅++= α
Con$entional * @ractional Power Control 39'95
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Con$entional * @ractional Power Control 39'95
• Con=(ntional PC )c+(m()"• Atte&pt to &aintain a constant S/NR at the recei$er• UE increases the Tx power to fll+ co&pensate for increases in the path loss
/ #ractional PC )c+(m()"• Allow the recei$e! S/NR to !ecrease as the path loss increases• UE Tx power increases at a re!ce! rate as the path loss increases /ncreases in path
loss are onl+ partiall+ co&pensate!• F/ /&pro$e air interface ecienc+ * increase a$erage cell throghpts %+ re!cing
/ntercell interference
/ =GPP species fractional power control for the PUSC# with the option to !isa%le it * re$ert tocon$entional %ase! on O
Con$entional PowerControl" O2
/f Path Loss increases %+2> !1 the UE Tx powerincreases %+ 2> !1
@ractional PowControl" O Q
/f Path Loss inc%+ 2> !1 the Upower increas2> !1
UE TxPower
UE TxPower
ULS/NR
ULS/NR
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