LTE Attach Procedure
LTE Attach Procedure
LTE Attach Procedure
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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 (PCI) can then be calculated by UE .
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UE Identities
IMEI (International Mobile Equipment Identity):
Type approval code
Manufacturer
Serial number
Additional number (usually 0)
353092052248770
System Information
System information distribution is an essential and basic feature of LTE RAN.
The UE requires system information to:
Perform idle mode tasks
PLMN selection
Cell selection and reselection
Conformity to Cell Reservations and Access Restrictions
Tracking Area registration
Originate access to the network
Terminate access including reception of paging messages
Maintain the LTE connection
Perform handover
System Information (SI) comprises the Master Information Block (MIB), the system Information
Block1 (SIB1) to SIB8. SIB1 is contained in an own RRC message, System Information Block
Type1 and cannot be combined with any other SIB, while one or more of SIB2-SIB8 can be
combined in the same SI message.
The MIB is broadcast on the Physical Broadcast Channel (PBCH). SIB1 messages and SI
messages are broadcast on the Physical Downlink Shared Channel (PDSCH) at regular intervals.
One or more of SIB 2 - SIB 8 can be combined in the same SI message
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System Information
SIB 1
i) Cell Access Related Information - PLMN Identity List, PLMN Identity, TA Code, Cell identity &
Cell Status
ii) Cell Selection Information - Minimum Receiver Level
iii) Scheduling Information - SI message type & Periodicity, SIB mapping Info, SI Window
length
SIB 2
i) Access Barring Information - Access Probability factor, Access Class Baring List, Access
Class Baring Time
ii) Semi static Common Channel Configuration - Random Access Parameter, PRACH
Configuration
iii) UL frequency Information - UL EARFCN, UL Bandwidth, additional emmission
SIB 3
i) Information/Parameters for intra-frequency cell reselections
SIB 4
i)Information on intra-frequency neighboring cells
SIB 5
i) Information on inter-frequency neighboring cells
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System Information
SIB 6
i) Information for reselection to UMTS (UTRAN) cells
SIB 7
i) Information for reselection to GSM (GERAN) cells
SIB 8
i) Information for reselection to CDMA2000 systems
SIB 9
i) Home eNodeB name for future LTE femtocell applications
SIB 10 + 11
i) ETWS (Earthquake and Tsunami Warning System) information
SIB 12
i)Commercial Mobile Alerting System (CMAS) information.
SIB 19
i)It contains Inter-RAT frequency and priority information to be used in the cell
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RRC
S1 Signaling
ERAB
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Attach Procedure
HSS
Update
Answer
Authentication
Information
Authentication
Update Location
Location
Request
UE
AMBR
Answer
Information
Request
IMSI
MME
APN (default),
AMBR, QCI
IMSI
E-UTRAN
Authentication
vector
APN, AMBR,
QCI
(KASME,
RAND,
AUTN, and XRES)
APN, AMBR, QCI
AttachAccept
Authentication
Security
Request
mode complete
command
Attach
Security
Complete
mode
Attach
IMSI
EPS
ciphering
/ GUTI (IP)algorithm
PDN
Request
Response
address
IMEI integrity
EPS
algorithm
AMBR
RAND
RES
and
andQCI
AUTN
UE capability
PCO
with DNS
UE
eNodeB
RRC
RRC
RRC
RRC
AMBR,
ARPPDN type
APN,
AMBR
and
QCI,
eNB S1u
IP, teid
PCO with
DNS
MME
S11 teid
SGW S11 & S1u teids
InitialContextSetup
initialUEMessage
downlinkNASTransport
uplinkNASTransport
uplinkNASTransport
downlinkNASTransport
InitialContextSetupResponse
uplinkNASTransport
AMBR
TAC
eNB
S1u
IP, TAC
teidQCI, ARP
Cell
id
and
Bearer
AMBR,
SGW
PGW
Create
Create Session
Session Response
Request
Default Bearer
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Attach Request
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Attach Accept
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Attach Accept
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Thank You
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