p.8
Attach Request and RRC Connection Request
What is the purpose of the document mentioned?
To describe the LTE Attach Call Flow.
p.8
Attach Request and RRC Connection Request
What does the author welcome from others regarding the document?
Corrections of any mistakes or incorrect data.
p.3
NAS Security Procedure
What is the purpose of NAS Security Procedure?
To secure the NAS Layer between UE and MME for secure communication.
p.2
Attach Request and RRC Connection Request
What are the procedures MME needs to follow for UE attachment?
1. UE Authentication, 2. NAS Security Procedure, 3. Location Update, 4. Session Creation.
p.6
Attach Request and RRC Connection Request
What is the purpose of the PDN Connectivity Request in LTE?
To request data and IMS signaling.
p.7
Default EPS Bearer Establishment
What does the RRC Re-Configuration Complete message include?
Activate Default EPS Bearer Context Request Accept Message.
p.3
NAS Security Procedure
What message does the MME send to initiate NAS Security?
Security Mode Command Message.
p.3
NAS Security Procedure
What information does the MME include in the Security Mode Command Message?
KSIASMI, UE Security Capability, IMEISV Req.
p.4
Session Creation Procedure
What is the purpose of the Create Session Request Message?
To initiate the establishment of S5 Bearer between S-GW and P-GW.
p.3
Location Update Procedure
What does the HSS send back to the MME in response to the Location Update?
Update Location Answer message including IMSI, APN, IMEI, MSISDN, PCO, TAI, etc.
p.6
Attach Request and RRC Connection Request
What does the UE request from the network in the second PDN Connectivity Request?
The address of P-CSCF for IMS Registration.
p.7
Default EPS Bearer Establishment
What does the eNb forward to the MME after receiving the UE's response?
Activate Default EPS Bearer Context Request Accept Message.
p.1
S5 Bearer Establishment Process
What information is included in the Initial UE Message sent to MME?
Attach Request and PDN Connectivity Request (for Data).
p.4
Session Creation Procedure
What does PCRF provide in response to the CCR?
PCC Rule for the UE in Credit Control Answer (CCA).
p.2
UE Authentication in LTE
What is sent by the MME to the HSS during UE Authentication?
An 'Authentication Request' including the User Name, PLMN, etc.
p.2
UE Authentication in LTE
What does the MME verify after receiving the RES from the UE?
Whether XRES is equal to RES.
p.4
DRB Bearer Establishment
What initiates the DRB Bearer Establishment?
Initial Context Setup Request message sent by MME to eNb.
p.8
Attach Request and RRC Connection Request
What is missing in the described call flow between UE and eNB?
UE Capabilities information sharing.
p.1
Default EPS Bearer Establishment
What completes the LTE Attach procedure?
Establishment of Default EPS Bearer between UE and P-GW.
p.2
UE Authentication in LTE
How does the UE respond after receiving the Authentication Request Message?
Generates the 'RES' value and sends it back to the MME in the 'Authentication Response Message'.
p.3
Location Update Procedure
What does the MME send to the HSS during the Location Update?
Location Update message including User Name, IMEI, RAT Type, PLMN, etc.
p.4
Session Creation Procedure
What does P-GW send to PCRF after receiving the request from S-GW?
Credit Control Request (CCR).
p.5
DRB Bearer Establishment
What does the UE send in response to the Security Mode Command Request?
'Security Mode Command Response Message'.
p.2
Attach Request and RRC Connection Request
What does the MME do after understanding that the UE wants to attach to the network?
Establishes the first bearer for the UE.
p.3
NAS Security Procedure
What does the UE send in response to the Security Mode Command Message?
Security Mode Command Response Message.
p.6
Default EPS Bearer Establishment
What does MME send to eNb after receiving the Create Session Response?
E-RAB Setup Request including Activate Default EPS Bearer Context Request.
p.7
Default EPS Bearer Establishment
What message does the UE send in response to the RRC Connection Reconfiguration?
RRC Re-Configuration Complete.
p.2
UE Authentication in LTE
What does the HSS generate in response to the MME's authentication request?
An Authentication Vector (AV) consisting of RAND, AUTH, XRES, and K ASME.
p.2
NAS Security Procedure
What is initiated by the MME if the authentication is successful?
The NAS Security Procedure.
p.6
Default EPS Bearer Establishment
What message does P-GW send to PCRF in response to the Create Session Request?
Credit Control Request (CCR).
p.5
DRB Bearer Establishment
What message does the UE send after establishing the DRB Bearer?
'RRC Connection Reconfiguration Complete' Message.
p.7
Default EPS Bearer Establishment
What message does the eNb send to the UE to activate the default EPS bearer context?
RRC Connection Reconfiguration Message.
p.1
Attach Request and RRC Connection Request
What happens after eNB receives the Attach Request Message from UE?
It forwards the message to MME in the Initial UE Message.
p.4
Session Creation Procedure
What message does the MME send to initiate Session Creation?
Create Session Request Message.
p.3
Session Creation Procedure
What is the final procedure the MME is ready to initiate after Location Update?
Session Creation Procedure.
p.5
DRB Bearer Establishment
What is embedded in the 'RRC Connection Reconfiguration' message?
'Attach Accept and Activate Default EPS Bearer Context Request'.
p.2
UE Authentication in LTE
What does the MME do with the XRES value after receiving the AVs from HSS?
Keeps the XRES value and sends the remaining data to the UE in the 'Authentication Request Message'.
p.2
UE Authentication in LTE
What happens if the XRES does not match the RES?
Authentication failure occurs and the attach is rejected.
p.4
DRB Bearer Establishment
What does eNb do after receiving the Initial Context Setup Request?
Initiates the DRB Bearer Establishment Procedure.
p.5
DRB Bearer Establishment
What message does the UE send to indicate completion of the attach process?
'Attach Complete' Message.
p.1
LTE Attach Procedure Overview
What are the key components of the LTE Attach procedure?
Dowling Synchronization and Uplink Synchronization.
p.1
Attach Request and RRC Connection Request
What message does the UE send to initiate the LTE Attach procedure?
Attach Request sent to eNB in RRC Connection Request.
p.5
DRB Bearer Establishment
What is the first step in the establishment of the Data Radio Bearer (DRB)?
The eNb receives the 'Initial Context Setup Request'.
p.5
DRB Bearer Establishment
What is the purpose of the 'Modification Bearer Request'?
To indicate that the S-GW can directly communicate with the eNb for further communication.
p.1
Default EPS Bearer Establishment
What does the Default EPS Bearer Establishment include?
S5 Bearer Establishment, DRB Bearer Establishment, and S1 Bearer Establishment.
p.4
Session Creation Procedure
What does P-GW do after receiving the PCC Rule?
Installs the Policy Decision for the UE and sends Create Session Response Message to S-GW.
p.5
DRB Bearer Establishment
What is indicated by the Security Mode Command Response Message?
That the security algorithms have been completed.
p.5
DRB Bearer Establishment
What does the eNb send after the AS layer is secured?
'RRC Connection Reconfiguration' to the UE.
p.5
DRB Bearer Establishment
What response does the eNb send after receiving the 'RRC Connection Reconfiguration Complete' message?
'Initial Context Setup Response Message' to the MME.
p.5
DRB Bearer Establishment
What message does the eNb send to secure the AS Layer?
'Security Mode Command Request Message'.
p.5
DRB Bearer Establishment
What does the MME do after receiving the 'Attach Complete' message?
Sends a 'Modification Bearer Request' to the S-GW.
