LTE Overview 67

8/13/2019 LTE Overview 67

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LTE Overview

Course Objectives:

Understand the development of mobile communications, and Long

Term Evolution (LTE position and net!or" architecture#

Understand the protocol architecture and basic technologies of E$

UT%&'#

Understand "e LTE technologies#


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1# %adio 8rotocol &rchitecture################################################################################################################)4

1##) Control 8lane 8rotocol &rchitecture####################################################################################)4

1## User 8lane 8rotocol &rchitecture#########################################################################################)7

1#1 /)


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3#1#) 8.C8 5unctions###################################################################################################################2

3#1# 8.U /tructure######################################################################################################################24

# RR$.............................................................................................................................................................4%

#) %%C 5unctions####################################################################################################################################29

# %%C /tate############################################################################################################################################30

#1 '&/ /tate and the %elationship -ith the %%C state##########################################################################3)

#2 %%C 8rocedure####################################################################################################################################3

#2#) /stem


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1 Overview

Knowledge points

+obile communications development

-C.+& evolution

T.$/C.+& evolution

C.+&000 evolution

1.1 Background

1.1.1 Mobile Communications Evolution

The development histor from = and 1= to 1#9 = is the development histor from lo!$

speed voice services to high$speed multimedia services of mobile communications#

1=88 has been progressivel perfecting LTE %7 standard:

)# LTE %7 %&') !as fro?en in .ecember 007#

# LTE %7 %&', %&'1, and %&'2 !ere fro?en in .ecember 007##

1# LTE %7 standard !as complete b +arch 009, implementing basic LTE

functions at the first commercial use of LTE sstems#

5igure )#) $) sho!s the development and evolution of !ireless communication

technologies#

1


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5igure )#)$) .evelopment and evolution of !ireless communication technologies

1.1.2 Comparison mong !C"M# T"$%C"M# and C"M2&&&

Table )#)$)Comparison among -C.+&, T.$/C.+&, and C.+&000

/tandard -C.+& C.+&000 T.$/C.+&


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Chapter 4 Core LTE Technologies

5igure )#)$ -C.+& technolog roadmap

1.1.( T"$%C"M Evolution

DTE !ireless net!or" e6uipment supports smooth evolution of recent T. evolutionsoft!are#

T. evolution can be divided into t!o stages: standard stage of C.+& technologies and

that of O5.+& technologies#

The standard stage of C.+& technologies can smoothl evolve to @/8& !ith

spectrum efficienc close to that of LTE#

Basic version

Short-term evolution version

Mid-term evolution version

Long-term evolution version (4G)

Phase I Phase II Phase III

C"M standard O)"M standard

'*++ ,-(/oice0"ata

1 2re3uenc4 point

'*++ ,-50607

8%+08%+9MBM%0Multi$Carrier

'*++ LTEO)"MM:MO

:MT$dv

5igure )#)$1 T.$/C.+& evolution

3


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LTEF5..Fe'*FEF)0 LTE Overvie!

1.1.5 C"M2&& Evolution

C.+& One is a collection of all


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5igure )#$3 Organi?ation and establishment stages of 1=88 standards

5


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2 LTE :nde;es and -e3uirements

2.1 Overview

Knowledge points

/pectrum division

LTE sstem re6uirements

Others

8hsical channels and mapping relationship

5igure #) $ sho!s the LTE inde;es and re6uirements prescribed b 1=88#

5igure #)$ LTE inde;es and re6uirements

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2.2 )re3uenc4 Band "ivision

Table # $ lists the E$UT%& fre6uenc bands#

Table #$ E$UT%& fre6uenc bands

E$UT%&

Operating

*and

Uplin" (UL operating band */ receive

UE transmit

.o!nlin" (.L operating band */

transmit UE receive

.uple;

+ode

()L*!&w+ ()L*hi'h (,L*!&w+

(,L*hi'h

) )90 +@? G )970 +@? ))0 +@? G )40 +@? 5..

)730 +@? G )9)0 +@? )910 +@? G )990 +@? 5..

1 )4)0 +@? G )473 +@? )703 +@? G )770 +@? 5..

2 )4)0 +@? G )433 +@? ))0 +@? G )33 +@? 5..

3 72 +@? G 729 +@? 79 +@? G 792+@? 5..

710 +@? G 720 +@? 743 +@? G 773 +@? 5..

4 300 +@? G 340 +@? 0 +@? G 90 +@? 5..

7 770 +@? G 9)3 +@? 93 +@? G 90 +@? 5..

9 )429#9 +@? G )472#9 +@? )722#9 +@? G )749#9 +@? 5..

)0 )4)0 +@? G )440 +@? ))0 +@? G )40 +@? 5..

)) )24#9 +@? G )23#9 +@? )243#9 +@? G )300#9 +@? 5..

) 97 +@? G 4) +@? 47 +@? G 42 +@? 5..

)1 444 +@? G 474 +@? 42 +@? G 43 +@? 5..

)2 477 +@? G 497 +@? 437 +@? G 47 +@? 5..

H

)4 402 +@? G 4) +@? 412 +@? G 42 +@? 5..

###

11 )900 +@? G )90 +@? )900 +@? G )90 +@? T..

12 0)0 +@? G 03 +@? 0)0 +@? G 03 +@? T..

13 )730 +@? G )9)0 +@? )730 +@? G )9)0 +@? T..

1 )910 +@? G )990 +@? )910 +@? G )990 +@? T..

14 )9)0 +@? G )910 +@? )9)0 +@? G )910 +@? T..

17 340 +@? G 0 +@? 340 +@? G 0 +@? T..

19 )770 +@? G )90 +@? )770 +@? G )90 +@? T..

20 100 +@? G 200 +@? 100 +@? G 200 +@? T..

2.' +eak "ata -ate

The instantaneous do!nlin" pea" rate reaches )00 +bitBs (3 bitBsB@? at 0 +@?

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do!nlin" spectrum band (t!o transmit antennas on the net!or" side and t!o receive

antennas on the UE side#

The instantaneous uplin" pea" rate reaches 30 +bitBs (#3 bitBsB@? at 0 +@? uplin"

spectrum band (one receive antenna on the UE side#

-idebands, +


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)# The user throughput per +@? at the 3J Cumulative .istribution 5unction (C.5

must reach t!o to three times the throughput of % @/.8

# The average user throughput per +@? must reach three to four times the

throughput of % @/.8

% @/.8& uses one transmitter one receiver ()T)% !hile LTE uses t!o transmitterBt!o

receiver (T%#

Uplin":

)# The user throughput per +@? at the 3J C.5 must reach t!o to three times the

throughput of % @/U8

# The user throughput per +@? must reach t!o to three times the throughput of %

@/U8

% @/U8& uses )T%, and so does LTE#

2.7 %pectrum Eicienc4

.o!nlin": On a net!or" !ith effective load, the target LTE spectrum efficienc(measured b the bit 6uantit per site, per @?, and per second is three to four times

more efficient than % @/U8 % @/.8& uses )T)% !hile LTE uses T%#

Uplin": On a net!or" !ith effective load, the target LTE spectrum efficienc (measured

b the bit 6uantit per site, per @?, and per second is t!o to three times more efficient

than % @/U8 % @/U8& uses )T%, and so does LTE#

2.> Mobilit4

E$UT%&' can provide optimum net!or" performance for mobile users at the speed of

0)3 "mBh, high performance services at the speed of )3)0 "mBh, and cell net!or"

services at the speed of )0130 "mBh (the speed even reaches 300 "mBh at specified

bands#

oice services and other realtime services provided in the % C/ domain are supported

b 8/ domain on the E$UT%&' and all these services can reach or e;ceed the 6ualit of

UT%&' services# The interrupt time caused b handovers !ithin the E$UT%& sstem

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must be shorter than or e6ual to the handover time of the =E%&' C/ domain#


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)# E$UT%&' and UT%&'B=E%&' multi$mode terminals support

UT%&'B=E%&' measurement and handover bet!een E$UT%&' sstems and

UT%&'B=E%&' sstems#

# The E$UT%&' sstem supports inter$sstem measurement#

1# The handover interrupt time bet!een %$UT%&' and UT%&' must be shorter

than 100 ms for realtime services#

2# The handover interrupt time bet!een E$UT%&' and UT%&' must be shorter

than 300 ms for non$realtime services#

3# The handover interrupt time bet!een E$UT%&' and =E%&' must be shorter

than 100 ms for realtime services#

# The handover interrupt time bet!een E$UT%&' and =E%&' must be shorter

than 300 ms for non$realtime services#

4# 8aging information of onl one of the =E%&', UT%&, or E$UT%& sstems

needs to be monitored for multi$mode terminals in non$active state (similar to %


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' LTE rc=itecture

Knowledge points

%adio protocol structure

/) interface

> interface

'.1 %4stem rc=itecture

LTE adopts an O5.+$based air interface technolog !hich is different from those of

= and 1=# LTE adopts a flat net!or" architecture !ithin !hich E$UT%&' contains

onl e'ode*s instead of %'C, so as to optimi?e the traditional 1= net!or" architecture#

LTE supports functions of 8.C8B%LCB+&CBphsical laer protocols on the E$UT%&

user plane and functions of the %%C protocol on the control plane# 5igure 1#) $4 sho!s

the E$UT%&' sstem architecture#

5igure 1#)$4 E$UT%&' architecture

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e'ode*s are connected over an ; interface and ever e'ode* is connected to the

Evolved 8ac"et Core (E8C net!or" over an /) interface# The user plane of /)

interfaces terminates on the /erving$=ate!a (/$=- and the control plane of /)

interfaces terminates on the +obile +anagement Entit (++E# The other end of the

control plane and user plane terminates on the e'ode*# 5unctions of all 'Es in the

preceding figure are listed as follo!s:

e'ode*

*esides the original e'ode* functions, e'ode* of LTE underta"es most of

original %'C functions such as phsical laer, +&C (including @&%A, %LC

laer (including &%A functions, 8.C8, %%C, scheduling, radio access control,

access mobilit management, and radio resource management among different

cells#

LTE e'ode*s have the follo!ing functions:

+anage radio resources: %adio bearer control, radio access control, connection

mobilit control, and dnamic resource assignment of uplin" and do!nlin"

(scheduling#

Compress


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5igure 1#)$7 5unctional split bet!een E$UT%&' and E8C

'.2 -adio +rotocol rc=itecture

'.2.1 Control +lane +rotocol rc=itecture

5igure 1# $9 sho!s the control plane protocol architecture#

5igure 1#$9 Control plane protocol stac"

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The 8.C8 terminates at e'ode* and implements functions such as control plane

encrption and integrit protection#

The %LC and +&C terminate at e'ode* on the net!or" side and implement identical

functions of the user plane and control plane#

The %%C terminates at e'ode* and implements such functions as broadcast, paging,

%%C connection management, %* control, mobilit, and UE measurement reporting and

control#

The '&/ terminates at ++E and implements such functions as E8/ bearer

management, authentication, idle$mode E8/ Connection +anagement (EC+, idle$mode

EC+ paging, and securit control#

'.2.2


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'.'.1 %1 :nterace

The /) interface is defined as the interface bet!een the E$UT%&' and E8C# The /)interface contains t!o parts: the control plane /)$++E interface and user plane /)$U

interface# The /)$++E interface is defined as the interface bet!een the e'ode* and

++EM the /)$UE interface is defined as the interface bet!een the e'ode* and /$=-#

5igure 1#1 $))and5igure 1#1 $) respectivel sho! the protocol stac" architecture of

the /)$++E interface and /)$U interface#

/CT8


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The /) interface has the follo!ing ac"no!ledged signaling procedures:

E$%&* signaling procedure

E$%&* establishment

E$%&* modification

++E$initiated E$%&* release

e'ode*$initiated E$%&* release

@andover signaling procedure

@andover preparation

%esource assignment

@andover termination

@andover cancellation

8aging

'&/ transmission procedure

.irect uplin" transmission (initial UE message

.irect uplin" transmission (uplin" '&/ transmission

.irect do!nlin" transmission (do!nlin" '&/ transmission

Error indication procedure

e'ode*$initiated error indication

++E$initiated error indication

%eset

e'ode*$initiated reset

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++E$initiated reset


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5igure 1#1$)1 $

U adopt the same user plane protocol to reduce protocol processing at e'ode* data

for!ard#

'.'.2 @2 :nterace

The > interface is defined as the interface bet!een e'ode*s# The > interface contains

t!o parts: the >$C8 and >$U, !here the >$C8 is the control plane interface bet!een

e'ode*s and the >$U is the user plane interface bet!een e'ode*s# 5igure 1#1 $)2 and

5igure 1#1 $)3respectivel sho! the protocol stac" architecture of the >$C8 interface

and >$U interface#

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/CT8

interface user plane

The >$C8 has the follo!ing functions:

UE mobilit in the EC+$CO''ECTE. state !ithin the LTE sstem

Conte;t transfer from the source e'ode* to the target e'ode*

User plane channel control bet!een the source e'ode* and the target e'ode*


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Uplin" load management

=eneral > interface management and error processing

Error indication

The >$C8 interface has the follo!ing ac"no!ledged signaling procedures:

@andover preparation


UE conte;t release

Error indication

Load management

The management of load among cells is implemented over the > interface#

5igure 1#1 $)sho!s that the LO&. , &8 LO&.


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( +=4sical La4er

(.1 )rame %tructure

The LTE sstem supports the follo!ing t!o radio frame structures:

/tructure ): &pplicable to the 5.. mode#

/tructure : &pplicable to the T.. mode#

5igure 2#) $)4 sho!s the frame structure )# Ever )0 ms radio frame is divided into ten

sub$frames of fi;ed length# Each sub$frame contains t!o time slots each of !hich is 0#3

ms long#

5igure 2#)$)4 5rame structure )

5or 5.., at ever )0 ms, ten sub$frames can be used for do!nlin" transmission and

another ten sub$frames can be used for uplin" transmission# The uplin" transmission and

do!nlin" transmission are separated on the fre6uenc domain#

(.2 +=4sical -esources

The minimum resource unit for uplin"Bdo!nlin" transmission in the LTE sstem is called

the %esource Element (%E#

&t the time of data transmission, the LTE sstem consolidates uplin" and do!nlin" time$

fre6uenc domain phsical resources into %esource *loc"s (%*s for scheduling and

allocation#

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5igure 2#$)9 8hsical resource structure of uplin" slot

(.' +=4sical C=annels

The do!nlin" phsical channels contain the follo!ing channels:

)# 8hsical *roadcast Channel (8*C@

The coded *C@ transmission bloc" maps to four sub$frames !ithin an 20 ms

interval#

The 20 ms timing is obtained b blind tests, namel, no specified signaling

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indicates the 20 ms timing#

-ith e;cellent$enough channels, ever sub$frame that the 8*C@ located can

separatel decode signals#

# 8hsical Control 5ormat


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5igure 2#3$0 +apping bet!een do!nlin" transport channels and do!nlin" phsical channels

5igure 2#3$) +apping bet!een uplin" transport channels and uplin" phsical channels

(.6 +=4sical %ignals

8hsical signals correspond to several phsical laer %Es, but do not carr an

information that comes from higher laers#

The do!nlin" phsical signals include the reference signal and the snchroni?ation

signal#

%eference signal

The do!nlin" reference signals include the follo!ing three tpes of reference

signals:

Cell$specific reference signals, associated !ith non$+*/5' transmission

+*/5' reference signals, associated !ith +*/5' transmission

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UE$specific reference signals

/nchroni?ation signals

The snchroni?ation signals include the follo!ing t!o tpes of signals:

8rimar snchroni?ation signal

/econdar snchroni?ation signal

5or 5.., the primar snchroni?ation signal maps to the last O5.+ smbol of

the time slot 0 and time slot )0# The secondar snchroni?ation signal maps to the

second last O5.+ smbol of the time slot 0 and time slot )0#

The uplin" phsical signals include the reference signals#

%eference signals

The uplin" reference signals include the follo!ing t!o tpes of signals:

.emodulation reference signals, associated !ith 8U/C@ or 8UCC@ transmission

/ounding reference signals, not associated !ith 8U/C@ or 8UCC@ transmission

The demodulation reference signals and the sounding reference signals use the

same base se6uence set#

(.7 +=4sical La4er Model

The follo!ing figures sho! the phsical laer models of various tpes of channels# 'ode

*s in all of the follo!ing figures are called e'ode*s or e'ode* in LTE#

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C-C

-esource mapping

Coding 9 -M

"ata modulation

:nterleaving

MC

sc=eduler

Sin&le Transport blocks

(dynamic size S!

Node B

"eso#rce'poer

assi&nment

Mod#lation

sc)eme

Antennamappin&

ntenna mapping

C-C

-esource demapping

"ecoding 9 -M

"ata demodulation

"einterleaving

UE

ntenna demapping

Error

indication

C-C

-esource mapping

Coding 9 -M

"ata modulation

:nterleaving

MC

sc=eduler

Sin&le Transport blocks

(dynamic size S!

Node B

"eso#rce'poer

assi&nment

Mod#lation

sc)eme

Antennamappin&

ntenna mapping

C-C

-esource demapping

"ecoding 9 -M

"ata demodulation

"einterleaving

UE

ntenna demapping

Error

indication

5igure 2#4$2 8hsical laer model for 8C@ transmission

C-C

-B mapping

Coding 9 -M

"ata modulation

:nterl.

C-C

-esource mapping

Coding 9 -M

"ata modulation

:nterleaving

MC

sc=eduler

N Transport blocks

(dynamic size S1, SN!

Node B

"eso#rce'poer

assi&nment

Mod#lation

sc)eme

Antenna

mappin&

ntenna mapping

C-C

-B mapping

Coding 9 -M

"ata modulation

:nterl.

C-C

-esource demapping

"ecoding 9 -M

"ata demodulation

"einterleaving

UE

ntenna demapping

Error

indications

Semi-static

coniguration

C-C

-B mapping

Coding 9 -M

"ata modulation

:nterl.

C-C

-esource mapping

Coding 9 -M

"ata modulation

:nterleaving

MC

sc=eduler

N Transport blocks

(dynamic size S1, SN!

Node B

"eso#rce'poer

assi&nment

Mod#lation

sc)eme

Antenna

mappin&

ntenna mapping

C-C

-B mapping

Coding 9 -M

"ata modulation

:nterl.

C-C

-esource demapping

"ecoding 9 -M

"ata demodulation

"einterleaving

UE

ntenna demapping

Error

indications

Semi-static

coniguration

5igure 2#4$3 8hsical laer model for +C@ transmission

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C-C

-B mapping

Coding 9 -M

"ata modulation

:nterl.

C-C

-esource demapping

"ecoding 9 -M

"ata demodulation

"einterleaving

MC sc=eduler

Node B

"eso#rceassi&nment

Mod#lationsc)eme

Antennamappin&

+A"Q in$oAK'NAK

ntenna demapping

C-C

-B mapping

Coding 9 -M

"ata modulation

:nterl.

C-C

-esource mapping

Coding 9 -M

"ata modulation

:nterleaving

8-A

UEError

indications

"eso#rce'po(erassi&nment

Mod#lationsc)eme

8-A

.2 +ower Control

8o!er control determines the energ per resource element (E8%E# E8%E denotes the

energ prior to C8 insertion# E8%E also denotes the average energ ta"en over all

constellation points for the modulation scheme applied# Uplin" po!er control determines

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the average po!er of one .5T$/O5.+ smbol on a phsical channel#

Uplin" po!er control

Uplin" po!er control procedure controls the transmit po!er of different uplin"

phsical channels#

.o!nlin" po!er allocation

e'ode* determines the do!nlin" transmit energ per resource element#

(.>.' -andom ccess +rocedures

8rior to initiation of the non$snchroni?ed phsical random access procedure, phsical

laer shall receive the follo!ing information from the higher laers:

)# %andom access channel parameters (8%&C@ configuration, fre6uenc position,

and preamble format#

# 8arameters for determining the root se6uences and their cclic shifts in the

preamble se6uence set for the cell (inde; to root se6uence table, cclic shift

('cs, and set tpe (normal or high$speed set#

5rom the phsical laer perspective, the phsical random access procedure encompasses

the transmission of random access preamble and random access response# The remaining

messages are scheduled for transmission b the higher laer on the shared data channel

and are not considered part of the L) random access procedure#

The follo!ing steps are re6uired for the phsical random access procedure:

)# 8hsical laer procedure is triggered upon re6uest of a preamble transmission b

higher laers#

# & preamble inde;, preamble transmission po!er

(8%E&+*LEFT%&'/+


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ma;imum allo!ed po!er configured at higher laers, and 8L indicates UE$

calculated do!nlin" path loss#

2# & preamble se6uence is then selected from the preamble se6uence set using the

preamble inde;#

3# & single preamble transmission then occurs using the selected preamble se6uence

!ith transmission po!er 8%E&+*LEFT%&'/+


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5 La4er 2

Laer consists of three sublaers 8.C8, %LC, and +&C# 5igure 7 and 5igure 9

respectivel sho! Laer do!nlin" and uplin" structures#

5igure 2#7$4 Laer do!nlin" structure

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5igure 2#7$7 Laer uplin" structure

The connection points among sublaers are "no!n as the /ervice &ccess 8oints (/&8#

The service provided b 8.C8 is referred to as the radio bearer# The 8.C8 provides the

%obust @eader Compression (%O@C and securit protection# The /&8 bet!een

phsical laer and +&C laer provides transport channels and that bet!een +&C laer

and %LC laer provides logical channels#

The +&C laer provides multiple;ing and mapping of logical channels (radio bearer to

transport channels (transport bloc"#

Onl one transport bloc" is generated at each TT< () ms in the uplin" or do!nlin" in thecase of non$+


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+apping bet!een logical channels and transport channels#

+&C /ervice .ata Unit (/.U multiple;ingBdemultiple;ing#

/cheduling information report#

Error correction through @&%A

Logical channel prioriti?ation of the same UE#

UE prioriti?ation through dnamic scheduling#

/election of transmission formats#

8adding#

5.1.2 Logical C=annels

+&C provides different tpes of data transmission services# The tpe of each logical

channel is defined based on the tpe of transmitted data#

Logical channels are categori?ed into:

Control channels: used to transfer data on the control plane#

Traffic channels: used to transfer data on the user plane#

Control channels include:

*roadcast Control Channel (*CC@#

The *CC@ is a do!nlin" channel used to broadcast sstem control messages#

8aging Control Channel (8CC@#

The 8CC@ is a do!nlin" channel used to transfer paging messages and sstem

information change notifications# The 8CC@ is used to page a UE !hen the UE

cell location is un"no!n to the net!or"#

Common Control Channel (CCC@#

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The CCC@ is used to transfer control messages bet!een UEs and net!or" !hen

there is no %%C connection bet!een them#

+ulticast Control Channel (+CC@#

& point$to$multipoint do!nlin" channel used for transmitting +*+/ control

information from the net!or" to the UE, for one or several +TC@s# This channel

is onl used to UEs that receive +*+/#

.edicated Control Channel (.CC@#

& point$to$point bi$directional channel that transmits dedicated controlinformation bet!een a UE and the net!or"#This channel is used b UEs having

an %%C connection#

Traffic channels include:

.edicated Traffic Channel (.TC@#

The .TC@ is a point$to$point channel, dedicated to one UE, for the transfer of

user information#

+ulticast Traffic Channel (+TC@#

& point$to$multipoint do!nlin" channel for transmitting traffic data from the

net!or" to the UE# This channel is onl used to UEs that receive +*+/#

5.1.' Mapping Between Logical C=annels and Transport C=annels

5igure 3#) $9and5igure 3#) $10respectivel sho! the mapping bet!een do!nlin"

and uplin" logical channels and transport channels#

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5igure 3#)$9 +apping bet!een do!nlin" logical channels and transport channels

5igure 3#)$10 +apping bet!een uplin" logical channels and transport channels

5.2 -LC %ubla4er

5.2.1 -LC )unctions

The %LC sublaer provides the follo!ing functions:

Transfer of upper laer 8.Us#

Error Correction through &%A (onl for &+ data transfer#

Concatenation, segmentation and reassembl of %LC /.Us (onl for U+ and

&+ data transfer#

%e$segmentation of %LC data 8.Us (onl for &+ data transfer#

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Transfer of user data#


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6 --C

6.1 --C )unctions

+ain 5unctions of %%C include:

*roadcast of sstem information related to the '&/s

*roadcast of sstem information related to the &/s

8aging

Establishment, retention, and release of %%C connection bet!een UEs and E$

UT%&'s, including:

&llocation of temporar identifiers bet!een UEs and E$UT%&'s

Configuration of the /ignaling %adio *earers (/%*s for %%C connection

Lo! priorit and high priorit /%*s

/ecurit management including "e management

Establishment, configuration, retention, and release point$to$point %*s

+obilit management, including:

+easurement report and reporting control of the mobile UEs bet!een cells and

bet!een %&Ts#

@andover

UE cell selection and reselectionM cell selection and reselection control

Conte;t for!arding during handover

+*+/ notification

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Establishment, configuration, retention, and release of %*s for the +*+/

Ao/ management

UE measurement report and reporting control

'&/ direct transfer

6.2 --C %tate

%%C state includes %%CF


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The 8.C8B%LCB+&C features of the %%CFCO''ECTE.

The UE can transmit and receive data toBfrom the net!or"s#

The UE intercepts controlled signaling channels related to the shared data

channels to vie! that !hether the UE is allocated an data on the shared data

channel#

The UE also reports channel 6ualit information and feeds bac" information to

e'ode*#

The .%> ccle can be conformed according to the UE mobilit level to save UEpo!er and enhance resource efficienc# This function is controlled b e'ode*#

6.' % %tate and t=e -elations=ip !it= t=e --C state

The '&/ state model can be described b the t!o$dimensional state model of the E8/

+obilit +anagement state (E++ and the E8/ Connection +anagement state#

E++ state:

E++$.E%E=


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E++$%E=


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%%C connection release

%adio resource configuration

/%* additionB modification

.%* release

/%* additionB modification

+&C main reconfiguration

/emi$persistent scheduling reconfiguration

8hsical channel reconfiguration

%adio lin" failure related actions

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7 Core LTE Tec=nologies

7.1 "uple; Mode


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5igure 4#$12 +ultiple;ing scheme in LTE uplin" sstems

7.' Multi$antenna Tec=nologies

.o!nlin" multi$antenna transmission:

+ulti$antenna transmission supports t!o or four antennas# The ma;imum number of

code !ords is and irrelevant of the number of antennas, but there is a fi;ed mapping

relationship bet!een core !ords and laers# 5igure 13 sho!s the general relationship

among code !ords, laers, and antenna ports#

5igure 4#1$13 8hsical channel processing

+ulti$antenna technologies include the /.+ and transmit diversit# The /.+ supports

/U$+


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%efer to the adaptive modulation and coding (&+C that is applied !ith three

modulation schemes (A8/P, )A&+, and 2A&+ and variable code rates#

Uplin" adaptation:


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@&%A operation in uplin" is governed b the follo!ing principles:

%egardless of the content of the @&%A feedbac" (&CP or '&CP, !hen a

8.CC@ for the UE is correctl received, the UE follo!s !hat the 8.CC@ as"s

the UE to do i#e# perform a transmission or a retransmission (referred to as

adaptive retransmission#

-hen no 8.CC@ addressed to the C$%'T< of the UE is detected, the @&%A

feedbac" dictates ho! the UE performs retransmissions#

'&CP: The UE performs a non$adaptive retransmission#

&CP: The UE does not perform an UL (retransmission and "eeps the data in the

@&%A buffer#

+easurement gaps are of a higher priorit than @&%A retransmissions:

-henever an @$&%A retransmission collides !ith a measurement gap, the @$

&%A retransmission does not ta"e place#

7.5.2 -A

The &%A !ithin the %LC sublaer has the follo!ing characteristics:

The &%A retransmits %LC /.Us or %LC 8.Us (segments#

&%A retransmissions are based on either %LC status reports or @&%AB&%A

interactions#

The %LC must poll %LC status reports#

/tatus reports can be triggered b upper laers#

7.5.' 8-A0-A :nteractions


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ppendi; bbreviations

&bbreviation 5ull 'ame

1=88 1rd =eneration 8artnership 8roject

*8/P *inar 8hase /hift Peing

C&8E> Capital E;penditure

.5T .iscrete 5ourier Transform

.%> .iscontinuous %eception

E$+*+/ Evolved +ultimedia *roadcast and +ulticast /ervice

e'ode* Evolution 'ode *

E1= evolved 1=

E8C Evolved 8ac"et Core

E$UT%& Evolved Universal Terrestrial %adio &ccess

@C% @igh Chip %ate

@e'* @ome e'ode*


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ppendi; B -eerences

/' 'ame

)3#9) 5easibilit stud for evolved Universal Terrestrial %adio &ccess (UT%& and

Universal Terrestrial %adio &ccess 'et!or" (UT%&'

3#9)1 %e6uirements for Evolved UT%& (E$UT%& and Evolved UT%&' (E$UT%&'

11#100 Evolved Universal Terrestrial %adio &ccess (E$UT%& and Evolved Universal

Terrestrial %adio &ccess 'et!or" (E$UT%&', Overall description

2 3#7)2 8hsical laer aspects for evolved Universal Terrestrial %adio &ccess (UT%&

3 1#)) 8hsical Channels and +odulation

1#) +ultiple;ing and channel coding

4 1#)1 8hsical laer procedures

7 1#)2 8hsical laer G +easurements

9 1#10 /ervices provided b the phsical laer

)0 1#11) %adio %esource Control (%%C

)) 1#)02 *ase /tation (*/ radio transmission and reception

) 1#1) +edium &ccess Control (+&C protocol specification

)1

1#20) =eneral 8ac"et %adio /ervice (=8%/ enhancements for Evolved Universal

Terrestrial %adio &ccess 'et!or" (E$UT%&' access

)2 1#01 8olic and charging control architecture

LTE Overview 67

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