What is call setup process?
In telecommunication, call setup is the process of establishing a virtual circuit across a telecommunications network. Call setup is typically accomplished using a signaling protocol.
What are the steps in GSM call setup procedure?
Call set-up within GSM consists of the following main steps:
- RR connection establishment.
- Service request.
- Ciphering mode setting.
- IMEI Check.
- Call initiation.
- Assignment of a traffic channel.
How a call is established in GSM network?
The call is routed through the telephone network to the closest MSC to the called GSM subscriber. Next, Gateway MSC checks with HLR, asking “Where is the GSM subscriber?” After that, the call is established to the actual MSC/VLR (Visiting MSC) either directly or through the fixed or international telephone network.
What is call set up success rate?
Definition: Call Setup Success Rate or CSSR CSSR is used to describe the fraction of attempts made while making a call resulting in a successful connection to the dialed number. The fraction in the process is the percentage of all the attempted calls.
How do you calculate call setup success rate?
The CSSR can be obtained through traffic measurement and drive tests. The ideal value of CSSR is 1 i.e. the network should be capable of accepting 100 % of the calls made. The formula used for calculating CSSR is: CSSR = Successful Assignments/Call-related Requests × 100%.
What is full GSM?
GSM (Global System for Mobile communication) is a digital mobile network that is widely used by mobile phone users in Europe and other parts of the world.
What is MOC and MTC in telecom?
Mobile Terminated Call ( MTC ) refers to a call within a telephone network in which the destination terminal is a mobile phone . The opposite term, in which the calling terminal is a cell phone, is called Mobile Originated Call ( MOC ).
How can I improve my call completion rate?
The ratio of the number of completed calls to the total number of attempted calls. This ratio is typically expressed as either a percentage or a decimal fraction. The call completion rate can be improved by increasing the number of calls made, increasing the percentage of calls completed, or both.
What is DCR in telecom?
In telecommunications, the dropped-call rate (DCR) is the fraction of the telephone calls which, due to technical reasons, were cut off before the speaking parties had finished their conversational tone and before one of them had hung up (dropped calls). This fraction is usually measured as a percentage of all calls.
What is call completion rate?
The Call Completion rate refers to the total number of calls that are initiated and connected successfully, in comparison to the number of calls that fail. A call failure can occur when there is an incorrect phone number, a non-answer, or a customer declines the call.
What is MSC in GSM?
Description. The mobile switching center (MSC) is the primary service delivery node for GSM/CDMA, responsible for routing voice calls and SMS as well as other services (such as conference calls, FAX, and circuit-switched data).
What is MTC in CDR?
When a station calls a mobile station, we can term it as a Mobile Terminated Call (MTC). For e.g. when a call is made from a MTNL landline to an Airtel mobile phone we call it as an MTC. The mobile terminated call set-up is described below. Initially the user dials the mobile number.
What is the data rate of FACCH?
The FACCH is used for in-call signalling, including call disconnect, handover and the later stages of call setup. It has a payload data rate of 9.2 kbit/s when paired with a full-rate channel (FACCH/F) and 4.6 kbit/s when paired with a half-rate channel (FACCH/H).
When does The FACCH take over control of a call?
This is the point when the FACCH takes over all control transactions. The core network sends the Alerting message when the called party alerting has been verified. When the called party answers, the network sends the Connect message. The MS replies with the Connect Acknowledge message and the call becomes active.
When does the TCH+FACCH assignment occur?
The TCH+FACCH assignment can occur at any time during the transaction, depending on the assignment type used by the network. The network starts the call on the SDCCH and assigns the TCH+FACCH after sending CC Call Proceeding. Call setup then completes on the FACCH.
What is the difference between the SDCCH and The FACCH?
The SDCCH uses 4-burst block interleaving in a 51-multiframe. The FACCH is always paired with a traffic channel. The FACCH is a blank-and-burst channel that operates by stealing bursts from its associated traffic channel. Bursts that carry FACCH data are distinguished from traffic bursts by stealing bits at each end of the midamble.