What happens during LTE Attach procedure?
What happens during LTE Attach procedure?
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. Learn Mobile Packet Core Network in 5 Hours.
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 combined attach in LTE?
Combined Attach It means that UE simultaneously performs registration for CS network and PS network. LTE is bascially packet only (PS only).
What are the details are sent to Enodes during initial attach request?
The eNodeB sends the RRC Connection Reconfiguration message including the EPS Radio Bearer Identity to the UE, and the Attach Accept message will be sent along to the UE.
How does eNodeB select MME?
eNodeB selects an available MME to serve the UE, based typically on network topology and the location of the UE within the network, so that the best MME is selected, e.g. to reduce the probability that the MME is changed.
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 IMSI attach in LTE?
Today’s topic is IMSI (International Mobile Subscriber Identity) and GUTI (Globally Unique Temporary Identifier). These two are parameters (identifiers) used in identifying UEs in LTE networks. What is IMSI? IMSI is a unique ID that globally identifies a mobile subscriber.
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 |
