Attach and Default Bearer Setup Messaging ... - EventHelix.com
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Attach and Default Bearer Setup Messaging ... - EventHelix.com
EventHelix.com • telecommunication design • systems engineering • real-time and embedded systems
S1AP: eNodeB MME S1AP Initial UE Message
• •
Initial UE Message is the first message sent to the MME to establish a connection The eNode uses the eNB-UE-S1APID to uniquely identify the UE EPS attach type may be: • •
•
EPS Attach: UE is attaching only to the 4G LTE network Combined EPS/IMSI Attach:
The UE identity is specified is: • •
IMSI: If the UE has is not registered with the network Old GUTI: Subsequent attach requests identify the UE with the Old GUTI
MME updates the UE location with the HSS Origin and Destination are specified as Host and Realm (domain) The user name in the request is set to IMSI The Radio Access Technology is specified in the RAT Type •
•
It will be set to EUTRAN for LTE access
The Visited PLMN is also included in the message
Command Code
Update Location Request
Application Id
S6a interface application Host
Diameter Update Location Request
•
• telecommunication design • systems engineering • real-time and embedded systems
The HSS accesses the database and responds with user information to the MME The Aggregate Maximum Bit Rate (AMBR) occurs twice in the message: •
•
•
The first occurrence specifies the maximum bit rate for the default PDP context The second occurrence specifies the data maximum data limit via the APN. These limits are specified by the PDN
Subscriber Status: Service Granted
Diameter Update Location Answer
•
Result Code: Success
Aggregate Maximum Bit Rate Access Restriction Data
•
Maximum Requested Bandwidth Uplink Maximum Requested Bandwidth Downlink Called Station Id
MSISDN PDN Type
IPV4
PDN GW Address
APN configuration also includes: •
• telecommunication design • systems engineering • real-time and embedded systems
PDN GW Name
IP address of the PDN Gateway. This address is used to determine the default route for the traffic towards the Internet IP address assigned to the UE (Served Party IP Address)
APN Configuration Profile QoS Class Identifier Served Party IP Address 3GPP Charging Characteristics Aggregate Maximum Bit Rate
MME initiates the default route establishment by asking the SGW to create a GTP tunnel The source is identified by the fully qualified endpoint identifier with the Tunnel Endpoint Identifier (TEID) and the MME IP Address The IP Address assigned to the UE is also included along with the downlink and uplink maximum data rates allowed at the APN level The TAI and ECGI (E-UTRAN Cell Group Identifier) information identify the current location of the user
RAT Type
EUTRAN
• telecommunication design • systems engineering • real-time and embedded systems
A request to establish a context between the MME and eNodeB The message contains SGW tunneling information This message acknowledges the successful Attach to the UE. The eNodeB will pass this message to the UE
Activate Default Bearer Request • •
The message initiates the default bearer setup on the UE The eNodeB will pass this message to the UE
The MME responds with MME UE S1AP ID that was received from the eNodeB in the initial UE message The message also contains the MME UE S1AP ID The message contains the maximum aggregate bit rate information. The message also contains the information about the default eRAB. • •
• • •
•
QCI to assign session priority The maximum bit rate for the eRAB Guaranteed bit rate for the eRAB Transport Layer Address assigns the IP Address for the user plane entity on the S-GW GTP TE ID identifies the S-GW end of the user plane tunnel
ENB UE S1AP ID Downlink Aggregate Max Bitrate (AMBR) Uplink
SIAP Initial Context Setup Request
•
MME UE S1AP ID
• telecommunication design • systems engineering • real-time and embedded systems
QCI eRAB Max Bit Rate Downlink eRAB Max Bit Rate Uplink eRABs to Setup
The Attach Accept is carried as NAS payload in the Initial Context Setup Request The message specifies that the attach has been successful. The terminal is attached to the EPS only (i.e. LTE only, no SGSN registration) The T3412 timer specifies the maximum time between tracking area updates from the terminal The TAI list in the message specifies the PLMN and the Tracking Area Codes for all the registered tracking areas The message contains GUTI. GUTI uniquely identifies the UE with PLMN, MME Group, MMC code and the M-TMSI Finally, the GPRS Ready timer is included in the message. •
EPS Attach Result T3412
NAS Attach Accept
•
• telecommunication design • systems engineering • real-time and embedded systems
The Attach Accept is carried as NAS payload in the Initial Context Setup Request The EPS Bearer id identifies the bearer that needs to be activated The EPS QoS carries quality of service information: • • •
•
•
QCI to assign session priority The maximum bit rate for the bearer Guaranteed bit rate for the bearer
The Access Point Name (APN) is included in the message The PDN IP address assigned by the HSS is passed to the UE
QCI Activate Default Bearer Request
•
• telecommunication design • systems engineering • real-time and embedded systems
The eNodeB sends the Initial Context Setup Response message to the MME. The message confirms the establishment of the GTP tunnel on the S1-U interface The message contains information about the RABs that are being established at startup. The following information is present for each RAB • • •
S1AP Initial Context Setup Response
•
• telecommunication design • systems engineering • real-time and embedded systems
MME UE S1AP ID eNB UE S1AP ID E-RAB Setup List
The E-RAB ID The transport layer IP address on the eNodeB. The eNodeB GTP Tunneling ID (TEID) for the eNodeB side.
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