Call Setup Success Rate
Encyclopedia
Call Setup Success Rate is a term in telecommunications denoting the fraction of the attempts to make a call
which result in a connection
to the dialled number (due to various reasons not all call attempts end with a connection to the dialled number). This fraction is usually measured as a percentage of all call attempts made.
In telecommunications a call attempt invokes a call setup procedure, which, if successful, results in a connected call. A call setup procedure may fail due to a number of technical reasons. Such calls are classified as failed call attempts. In many practical cases this definition needs to be further expanded with a number of detailed specifications describing which calls exactly are counted as successfully setup and which not. This is determined to a great degree by the stage of the call setup procedure at which a call is counted as connected. In modern telecommunication systems, such as cellular (mobile) networks
, the call setup procedure maybe very complex and the point at which a call is considered successfully connected may be defined in a number of ways, thus influencing the way the call setup success rate is calculated. Please note, that if a call is connected successfully but the dialled number is busy then the call is counted as successful.
Another term, used to denote call attempts which fail during the call setup procedure, is blocked calls.
The call setup success rate in conventional (so-called land-line) networks is extremely high and is significantly above 99.9%. In mobile communication systems using radio channels the dropped-call rate is lower and may range for commercial networks between 90% and 98% or higher. The main reasons for unsuccessful call setups in mobile networks are lack of radio coverage (either in the downlink or the uplink
), radio interference between different subscribers, imperfections in the functioning of the network (such as failed call setup redirect procedures), overload of the different elements of the network (such as cells), etc.
The call setup success rate is one of the key performance indicators (KPI
) used by the network operators to assess the performance of their networks. It is assumed to have direct influence on the customer satisfaction with the service provided by the network and its operator. The call setup success rate is usually included, together with other technical parameters of the network, in a key performance indicator known as service accessibility.
The operators of telecommunication networks aim at increasing the call setup success rate as much as practical and affordable. In mobile networks this is achieved by improving radio coverage, expanding the capacity of the network and optimising the performance of its elements, all of which may require considerable effort and significant investments on the part of the network operator.
Call
Call may refer to:* A type of betting in poker* Animal communication, a song or noise made by an animal such as:** Bird call, part of a bird song* A command in square dancing, delivered by a caller* Call option, a term in stock trading...
which result in a connection
Telecommunication circuit
A telecommunication circuit is any line, conductor, or other conduit by which information is transmitted.A dedicated circuit, private circuit, or leased line is a line that is dedicated to only one use...
to the dialled number (due to various reasons not all call attempts end with a connection to the dialled number). This fraction is usually measured as a percentage of all call attempts made.
In telecommunications a call attempt invokes a call setup procedure, which, if successful, results in a connected call. A call setup procedure may fail due to a number of technical reasons. Such calls are classified as failed call attempts. In many practical cases this definition needs to be further expanded with a number of detailed specifications describing which calls exactly are counted as successfully setup and which not. This is determined to a great degree by the stage of the call setup procedure at which a call is counted as connected. In modern telecommunication systems, such as cellular (mobile) networks
Cellular network
A cellular network is a radio network distributed over land areas called cells, each served by at least one fixed-location transceiver known as a cell site or base station. When joined together these cells provide radio coverage over a wide geographic area...
, the call setup procedure maybe very complex and the point at which a call is considered successfully connected may be defined in a number of ways, thus influencing the way the call setup success rate is calculated. Please note, that if a call is connected successfully but the dialled number is busy then the call is counted as successful.
Another term, used to denote call attempts which fail during the call setup procedure, is blocked calls.
The call setup success rate in conventional (so-called land-line) networks is extremely high and is significantly above 99.9%. In mobile communication systems using radio channels the dropped-call rate is lower and may range for commercial networks between 90% and 98% or higher. The main reasons for unsuccessful call setups in mobile networks are lack of radio coverage (either in the downlink or the uplink
Uplink
A telecommunications link is generally one of several types of information transmission paths such as those provided by communication satellites to connect two points on earth.-Uplink:...
), radio interference between different subscribers, imperfections in the functioning of the network (such as failed call setup redirect procedures), overload of the different elements of the network (such as cells), etc.
The call setup success rate is one of the key performance indicators (KPI
KPI
KPI may stand for:*Key performance indicator*Kiev Polytechnic Institute*Kharkiv Polytechnic Institute*King pin inclination, see also camber angle*Kralyevich Productions, Inc*Kuwait Petroleum International...
) used by the network operators to assess the performance of their networks. It is assumed to have direct influence on the customer satisfaction with the service provided by the network and its operator. The call setup success rate is usually included, together with other technical parameters of the network, in a key performance indicator known as service accessibility.
The operators of telecommunication networks aim at increasing the call setup success rate as much as practical and affordable. In mobile networks this is achieved by improving radio coverage, expanding the capacity of the network and optimising the performance of its elements, all of which may require considerable effort and significant investments on the part of the network operator.