System and method for learning transmission band of multiplex packet

A method of controlling a connection type exchange including trunk interface connected to a trunk line, medium pattern memory means for storing, in correspondence with the trunk interface, medium patterns indicative of combinations of communication media of terminals corresponding to previously registered call data and limit medium pattern memory means for storing, in correspondence with the trunk interface, limit medium patterns used as bases for judging whether a new call is to be accepted or not, wherein the exchange performs an actual packet communication after determining a communication path and a communication channel in accordance with the previously registered call data prior to a communication between the terminals;

• the method comprising the steps of:
• measuring, when the medium patterns stored in the medium pattern memory means reach the limit medium patterns stored in the limit medium pattern memory means, the number of communication packets per unit time in the trunk interface;
• estimating a normal distribution value of the number of communication packets in the actual packet communication corresponding to the medium patterns stored in the medium pattern memory means on the basis of the measured number of communication packets per unit time;
• obtaining communicable new limit medium patterns in correspondence with the estimated normal distribution value;
• updating the limit medium patterns stored in the limit medium pattern memory means by the obtained new limit medium patterns;
• comparing the medium patterns stored in the medium pattern memory means and the limit medium patterns stored in the limit medium pattern memory means to judge whether the new call is to be accepted or not;
• and
• controlling the connection type exchange to establish a communication channel between the terminals so that the terminals may exchange data when judgment is made that the new call is to be accepted.

A connection type exchange which, prior to a communication between terminals, determines a communication path and a communication channel through each trunk line in accordance with previously registered call data for performing actual packet communication, comprising:

• a plurality of terminal interfaces each connected to one of the terminals;
• measuring means provided in each terminal interface for measuring the number of communication packets per unit time from the terminal;
• first memory means provided in each terminal interface for storing a mean value and a variance value of the number of communication packets from the terminal, the mean value and the variance value being calculated on the basis of the number of communication packets measured by the measuring means;
• second memory means for storing a means value and a variance value of the number of communication packets from the terminal corresponding to all of calls already registered in the trunk line;
• estimating means for receiving the mean value and the variance value of the number of communication packets from the terminal, which are stored in the first memory means, and the mean value and the variance value of the number of communication packets from the terminal corresponding to all of the calls already registered in the trunk line, which are stored in the second memory means, and estimating an operational transmission band of the trunk line on the basis of the received means values and variance values;
• call acceptance judging means for judging whether a new call is to be accepted or not by comparing the operational transmission band of the trunk line estimated by the estimating means and a maximum operation transmission band of the trunk line;
• and
• communication channel establishing means for establishing a communication channel between the terminals so that the terminals may exchange data when said call acceptance judging means judges that the new call is to be accepted.

A method of controlling a connection type exchange including a plurality of terminal interfaces each connected to a terminal, measuring means provided in each terminal interface for measuring the number of communication packets per unit time, first memory means provided in each terminal interface for storing a mean value and a variance value of the number of communication packets from the terminal, the means value and the variance value being calculated on the basis of the number of communication packets measured by the measuring means, and second memory means for storing a mean value and a variance value of the number of communication packets from the terminal corresponding to all of calls already registered in a trunk line, wherein the exchange, prior to a communication between the terminals, determined a communication path and a communication channel through each terminal in correspondence with previously registered call data for performing actual packet communication, the method comprising the steps of:

• when a new call is issued from the terminal, estimating an operational transmission band of the trunk line on the basis of the mean value and the variance value of the number of communication packets from the terminal, which are stored in the first memory means, and the mean value and the variance value of the number of communication packets from the terminal corresponding to all of the calls already registered in the trunk line, which are stored in the second memory means;
• judging whether a new call is to be accepted or not by comparing the operational transmission band of the trunk line estimated in the estimating step and a maximum operational transmission band of the trunk line;
• and
• controlling the connection type exchange to establish a communication channel between the terminals so that the terminals may exchange data when judgment is made that the new call is to be accepted.