What is call establishment procedure in 3G?

What is call establishment procedure in 3G?

A 3G UMTS originating voice call setup involves complex signaling to set up and release the call. RRC (Radio Resource Control) signaling between the UE and RAN sets up the radio link. RANAP (Radio Access Network Application Part) signaling sets up the session between the RAN and the Core Network (MSC).

What is 3G call flow?

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.

What is a call flow process?

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 is VoLTE call flow?

Voice over LTE (VoLTE) is the standard for voice call setup in LTE networks. VoLTE uses IMS signaling to setup voice calls. The following VoLTE call flow describes the IMS call setup and release. An example of sending an SMS over IMS is also included. Sample RTP and RTCP messages are also shown in the flow.

What is GSM call flow?

GSM Call Flow (GSM Originating Call) RR connection establishment is triggered by sending the Channel Request message. This message requests the Base Station System (BSS) for allocation for radio resources for the RR connection setup. The mobile now waits for an assignment on the Access Grant Channel (AGCH).

What is CM Service Request?

CM Service Request Setup Overview CM Service Request Setup enables/disables the test set to ignore/reject CM Service Request during mobile originating call or packet mode connection establishment.

How do you create a call flow diagram?

Procedure

1. In the Project Explorer view, right-click the UML package; then click Add Diagram > Call Flow Diagram.
2. In the Call Flow Name field, type a name for the diagram, and click OK.
3. To create lifelines in the diagram that represent call flow participants, in the Palette, click Lifeline and drag it into the diagram.

What are the three types of call flow?

Attendant manages three types of call flows (inbound, outbound, and calls to the operator).

What is VoLTE protocol?

Outlined in GSMA standards, Voice over Long Term Evolution (Voice over LTE or VoLTE) is the practice of packetizing voice over the Internet Protocol (VoIP) and transporting both the signaling and media components over a 4G LTE packet switched (PS) data path.

What is RTP gap in LTE?

RTP is a protocol designed to transfer real time media payloads, including voice and video. RTP is also used to support end to end voice transfer in the VoLTE (Voice over LTE) architecture. The protocol itself provides services such as payload identification, sequential delivery and jitter correction via a timestamp.

What is MO and MT call?

Two important terms that you may find mentioned regularly are MO, which means Mobile Originated and MT, which stands for Mobile Terminated.

What are the steps in GSM call setup procedure?

Call set-up within GSM consists of the following main steps:

1. RR connection establishment.
2. Service request.
3. Authentication.
4. Ciphering mode setting.
5. IMEI Check.
6. TMSI-Reallocation.
7. Call initiation.
8. Assignment of a traffic channel.

How does a 3G UMTS originating call setup work?

A 3G UMTS originating voice call setup involves complex signaling to set up and release the call. RRC (Radio Resource Control) signaling between the UE and RAN sets up the radio link. RANAP (Radio Access Network Application Part) signaling sets up the session between the RAN and the Core Network (MSC). Click on the image to see the full call flow.

When does LTE redirect UE to UMTS network?

The LTE network will redirect the UE to UMTS network to complete the call. CS Service Notification message: This message is sent by the network when a paging request with CS call indicator was received via SGs for a UE, and a NAS signalling connection is already established for the UE.

Can a UE have data on a 2G network?

When in legacy network (3G/2G) the UE can have PS data sessions. PS data is supported in 2G network only when DTM (Dual Transfer Mode) is supported. When UE supports DTM it can have both voice and data simultaneously.

What happens in case of Mt call on LTE?

In case of MT call, our UE is registered and is in LTE network. It receives a CS service notification EPS mobility management message for an incoming call. The LTE network will redirect the UE to UMTS network to complete the call.