What are the steps in GSM call setup procedure?

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 GSM call flow?

A GSM mobile phone uses a Random Access Channel (RACH) to request a dedicated channel from the base station. The base station responds with a Radio Resource Assignment on the Access Grant Channel (AGCH). The base station then sends the call to the mobile switching center (MSC) via the base station controller (BSC).

How do GSM calls work?

A call originating from a mobile device (MS) in the GSM network is routed through the core network to the destination party. To connect to the GSM network, an MS first connects to a radio network, which is in charge of handling messaging between devices and the core network.

How mobile terminated call is achieved?

When a station calls a mobile station, we can term it as a Mobile Terminated Call (MTC). If so then an MSRN (Mobile Subscriber Roaming Number) is requested from the subscriber’s current VLR. After receiving the MSRN, the HLR determines the MSC responsible for the mobile station and sends this information to the GMSC.

What is handover in GSM?

Handover or hand off is a process in telecommunication and mobile communication in which cellular transmission (voice or data) is transferred from one base station (cell site) to another without losing connectivity to the cellular transmission.

What is GSM vs CDMA?

GSM handsets came with a SIM card slot, while CDMA phones did not. In other words, CDMA is a handset-based standard, with a phone number linked to a particular device. If you wanted to upgrade to another phone, you would have to get in touch with the network carrier, de-activate the old device and activate the new one.

Is flow GSM or CDMA?

FLOW uses the GSM standard for 2G which is accessible on 850 and 1900 MHz. It provides data connectivity exclusively using GPRS and EDGE. All FLOW markets have GSM coverage.

How do you make 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 is GSM service call?

During a GSM call, speech is converted from analogue sound waves to digital data by the phone itself, and transmitted through the mobile phone network by digital means. (Though older parts of the fixed Public Switched Telephone Network may use analog transmission.)

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.