lte attach procedure

8/9/2019 LTE Attach Procedure

1/34


2/34

All Rights Reserved Alcatel-Lucent2 |

1. LTE Network Architecture2. Cell Search3. UE Identities4. Syste In!oration". #ando Access $rocedure

%. Attach $rocedure


3/34

All Rights Reserved Alcatel-Lucent |

!P" #et$ork Architecture!P" #et$ork Architecture


4/34

All Rights Reserved Alcatel-Lucent% |

The cell search procedure allows the UE to acquire the slot and frame synchronization and to get the downlink

cell ID and cell ID group associated with the cell. The Physical cell ID (PI! can then "e calculated "y UE .


5/34

All Rights Reserved Alcatel-Lucent& |


6/34

All Rights Reserved Alcatel-Lucent' |

I#$I (International #o"ile $u"scri"er Identity!%&Mobile Country Code (MCC)

&Mobile Network Code (MNC)&Mobile Subscriber Identification Number (MSIN) identifying the mobile subscriber

within a PLMN.

!!!"###$##%&'

'lo"ally Unique Temporary UE Identity ('UTI!%&*+I, - *MMI,M/+MSI,0&*MMI, - MCC,MNC,MM Identifier,&MM Identifier, - MM rou1 I2,MM Code,

!!!"#%33#4!!4#&%34$%##

$T#$I is a com"ination of the ##Eand the #T#$I

!!4#&%34$%##

I#EI (International #o"ile Equipment Identity!%&+y1e a11ro5al code&Manufacturer&Serial number&6dditional number (usually #)

3#'&&4"$$#

(! )dentities(! )dentities


7/34All Rights Reserved Alcatel-Lucent* |

"+stem )n,ormation"+stem )n,ormation$ystem information distri"ution is an essential and "asic feature of )TE *+,.

The UE requires system information to%

& Perform idle mode tasks

- P)#, selection

- ell selection and reselection

- onformity to ell *eserations and +ccess *estrictions

- Tracking +rea registration

& /riginate access to the network& Terminate access including reception of paging messages

& #aintain the )TE connection

& Perform handoer

$ystem Information ($I! comprises the #aster Information 0lock (#I0!1 the system Information

0lock2 ($I02! to $I03. $I02 is contained in an own ** message1 $ystem Information 0lockType2 and cannot "e com"ined with any other $I01 while one or more of $I04$I03 can "e

com"ined in the same $I message.

The #I0 is "roadcast on the Physical 0roadcast hannel (P05!. $I02 messages and $I

messages are "roadcast on the Physical Downlink $hared hannel (PD$5! at regular interals.

/ne or more of $I0 4 $I0 3 can "e com"ined in the same $I message


8/34All Rights Reserved Alcatel-Lucent |

$I0 2

i! ell +ccess *elated Information P)#, Identity )ist1 P)#, Identity1 T+ ode1 ell identity 6

ell $tatusii! ell $election Information #inimum *eceier )eel

iii! $cheduling Information $I message type 6 Periodicity1 $I0 mapping Info1 $I 7indow

length

$I0 4

i! +ccess 0arring Information +ccess Pro"a"ility factor1 +ccess lass 0aring )ist1 +ccess

lass 0aring Timeii! $emi static ommon hannel onfiguration *andom +ccess Parameter1 P*+5

onfiguration

iii! U) frequency Information U) E+*8,1 U) 0andwidth1 additional emmission

$I0 9

i! Information:Parameters for intrafrequency cell reselections

$I0 ;

i!Information on intrafrequency neigh"oring cells

$I0 () $ith ==! change#et$ork Attach 6ased on >() $ith ==! change


27/34

All Rights Reserved Alcatel-Lucent2* |

#et$ork Attach 6ased on >() $ith ==! change#et$ork Attach 6ased on >() $ith ==! change


28/34

All Rights Reserved Alcatel-Lucent

UE eNode(

))E

$*+S*+

e!ault (earer

SS

initial*Message&+6C

##C

6ttach 7e8uest

&IMSI 9 *+I&IMI&* ca1ability

6uthentication

Information 7e8uest&IMSI

6uthentication Information

6nswer&/*+76N 6uthentication 5ector

(:6SM0 76N20 6*+N0 and ;7S)

downlinkNASTransort

6uthentication

7e8uest&76N2 and 6*+N

##C

6uthentication

7es1onse&7S

##C##C

ulinkNASTransortdownlinkNASTransort

Security mode command

&PS ci1hering algorithm&PS integrity algorithm

##C

Security ode colete

##C

ulinkNASTransort

Create Session 7e8uest&6PN0 6M


29/34


L! Attach 8all 3lo$ 0 !9A La+er =essagesL! Attach 8all 3lo$ 0 !9A La+er =essages


31/34


Attach Re?uestAttach Re?uest


32/34


Attach AcceptAttach Accept


34/34

Thank ouThank ou

lte attach procedure

Documents