What is LTE attach call flow?

What is LTE attach call flow?

Here’s the LTE Attach Procedure Call Flow, broken down into steps, derived by 3GPP. Step 1. The UE initiates the attach procedure by transmitting an attach request to the eNodeB. Step 2. The eNodeB derives the MME from the RRC parameters carrying the old GUMMEI and the indicated Selected Network.

What is the LTE call?

LTE is called ‘Long Term Evolution’. Airtel launched the first LTE network service in India in 2012. VoLTE stands for ‘Voice over Long Term Evolution’. It also supports 4G networks. In VoLTE, you can enjoy data connectivity while calling.

How does LTE call work?

VoLTE (voice over LTE) refers to voice calls that are made over a 4G LTE network instead of more traditional calls which are made by using CSFB (Circuit-Switched Fall-back), a system that switches back to 2G or 3G technologies just before connecting a call.

What is call flow?

A call flow is a road map to how calls will be handled from the moment they enter the phone system to the end of the call. Call flows can be used to handle even the most complex call scenarios and enable great customer care.

What are LTE interfaces?

Within an LTE network, LTE Interfaces connect the various components to or within the core. Interfaces allow the MME, SGW and PGW to cooperate with other network elements (e.g. HSS or PCRF). Each one of them is built in a standard way described by 3GPP.org.

What happens when a LTE UE is powered on?

A UE performs cell search on all frequencies before selecting or re-selecting to a cell. In an LTE system, two types of synchronization signals for cell search: primary synchronization signals (PSS) and secondary synchronization signals (SSS).

How does data flow in LTE?

Packets received by a layer are called Service Data Unit (SDU) while the packet output of a layer is referred to by Protocol Data Unit (PDU). PDCP Layer submits PDCP PDUs (RLC SDUs) to RLC layer. …

Is LTE circuit switched or packet switched?

In LTE (4G) the entire network uses packet switching and has no capability for circuit switched network support. As a result, the voice and SMS services must be moved over to a packet switched network when using the LTE (4G) network.

What is call flow in Telecom?

Call flow describes the process by which a network routes a call to a mobile device. Even LTE devices still use 3G networks for most voice calls. 3G call flow is different in a GSM network than in a CDMA network.

Why is a call flow important?

By using a Call Flow, you can create a schedule. This schedule can give the incoming call the correct options based on the time of day. Call Flows can also forward the customer to another number through the prompts available. This can help in many different cases, including if there is an emergency.

What is call flow and signaling in LTE?

In fact, call flow and signaling is unique for LTE, and is driven by 3GPP standards. Call flow is how signaling and sessions are established across an LTE network.

What are the different procedures in LTE?

We will have a look at the call flow diagrams about different procedures in LTE which includes basic registration, Carrier Aggregation (band addition and removal), 4×4 MIMO activation, SMS etc. LTE is a Packet only technology which is designed for handling data traffic. There are two options of handling voice (CS) call in LTE.

What happens when a 4G LTE subscriber initiates a voice call?

Explore contents of messages exchanged during an X2 handover between two eNodeBs. A 4G LTE subscriber initiates a voice call in an LTE network that does not support VoLTE. In such cases, the UE falls back to 3G networks to establish a voice call.

What does volte mean?

Voice over LTE (VoLTE) Call Flow An iPhone setting up a VoLTE call with IMS signaling. LTE to 3G Circuit Switched Fallback (CSFB) Call Flow A 4G LTE subscriber initiates a voice call in an LTE network that does not support VoLTE. In such cases, the UE falls back to 3G networks to establish a voice call.