What is attach request in LTE?
LTE attach procedure is the procedure in which the UE registers to the network, and creates the EPS Bearer between the UE and the PGW, in order to be able to send and receive data, to and from the PDN.
What is Emergency Attach in LTE?
The attach type IE is used for signaling either a “combined” or “emergency” attach. A UE that is “combined” attached might send a PDN connectivity request for emergency bearer services. After setup of such a bearer, if CSFB is requested, CSFB procedure will proceed with no interaction.
What is EPS only attach?
The result “EPS only” indicates that the attach request for EPS services (only) has been successful but attach for non-EPS services or “SMS only” (if requested by the UE in the ATTACH REQUEST) has failed.
How many types attach in LTE?
three different types
There are three different types of attach as listed below….Attach Type.
| Direction | Message |
|---|---|
| UE <– NW | RRC : RRC Connection Reconfiguration + NAS : Attach Accept + NAS : Activate Default EPS Bearer Context Req |
What is Guti attach?
In LTE, the GUTI is the Globally Unique Temporary ID, and identifies the mobile device to the LTE network. The GUTI is assigned to the device by the Mobility Management Entity (MME), the access network’s primary control node.
What is UE attach?
the UE establishes radio link synchronization with an eNB, the UE creates a connection for data delivery via an Attach Request message sent to the eNB, the eNB then forwards the attach request to an MME, which in its turn sends an Update Location Request to an HSS.
What is initial attach?
Cases of Initial Attach. When a UE initially attaches to a network, an MME initiates a different procedure depending on the type of such attach. The procedure begins when a user sends an Attach Request message to an MME, and ends when the MME returns an Attach Accept message to the UE.
What is SRB1 and SRB2 in LTE?
SRB1 used to transfer RRC messages which use DCCH channel. • SRB2 used to transfer RRC messages which use DCCH channel and encapsulates a NAS message. SRB1 is also used to encapsulate NAS message if SRB2 has not been configured. SRB2 has lower priority then SRB1 and it is always configured after security activation.
What is Guti and Gummei?
The GUTI (Globally Unique Temporary Identity) has two main components, the GUMMEI (Globally Unique MME Identifier) that uniquely identifies the MME that allocated the GUTI and the M-TMSI (M-Temporary Mobile Subscriber Identity) that provides for an unambiguous identity of the UE within this MME.
What is M-TMSI and S-TMSI?
The M-TMSI is a 32-digit binary number that is part of the GUTI and exclusively used in the E-UTRAN. The S-TMSI consists of the Mobility Management Entity Code (MMEC) and M-TMSI. Indeed, it is just a shorter variant of the GUTI. at 2:21 AM.
What is combined attach?
‘Combined Attach’ means the MS is making an attach to the CS and PS domains in the same time. And this will save the radio resources of the network. This will be available if the Gs interface exists between the CS domain and the PS domain. In addition, the MS should support working in both CS and PS domains.
What is DRB and SRB?
In LTE there are two main types of bearers, namely the SRB (Signalling Radio Bearer) and the DRB (Data Radio Bearer). The DRB is used to carry the data associated with an EPS bearer. If you enjoy using our glossary, here are some other useful resources you might like…
What is SRB0 and SRB1 in LTE?
SRB0 used to transfer RRC messages which use CCCH channel. • SRB1 used to transfer RRC messages which use DCCH channel. • SRB2 used to transfer RRC messages which use DCCH channel and encapsulates a NAS message.
How many types of SIBs are available in LTE?
In LTE there are 13 types of SIBs. Each SIB has its own job to do, which means, they are meant to carry information which are related to performing their assigned job.
What is IMSI and TMSI?
The Temporary Mobile Subscriber Identity (TMSI) is a temporary identification number that is used in the GSM network instead of the IMSI to ensure the privacy of the mobile subscriber. The TMSI prohibits tracing of the identity of a mobile subscriber by interception of the traffic on the radio link.
What is P TMSI in LTE?
The P-TMSI is a temporary identity issued to a GPRS enabled mobile, unique within a given RA (Routing Area), and is used by the GPRS network to page the specified mobile. The P-TMSI is comprised of 32bits and is associated with the TLLI (Temporary Logical Link Identifier).
What is the difference between IMSI and TMSI?