lte deep concept part1

8/18/2019 LTE Deep Concept Part1

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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


3/26

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


5/26

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


6/26

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,


10/26

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


11/26

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


12/26

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,)


&!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)


&*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 %


14/26

/!le )o!e )o%ilit+

!l ! ( i


15/26

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 ) !


16/26

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


17/26

Connecte! )o!e )o%ilit+

C t ! ) ! LTE ( i


18/26

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

• (


22/26

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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lte deep concept part1

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