Method and apparatus for control in ATM

A call admission control apparatus in an asynchronous transfer mode, comprising:

• first storage means for storing first data which include information concerning upper bounds of probability distributions of the number of arrivals for a plurality of values of arrival rate;
• arrival rate determining means for determining an upper bound of a probability distribution of an arrival rate in a call admitted state which is to be evaluated;
• cell length determining means for determining, by using said first data, an upper bound of a probability distribution of a cell length which is given by upper bounds of probability distributions of the number of arrivals along said determined upper bound of the probability distribution of the arrival rate;
• parameter determining means for determining, by using said upper bound of the probability distribution of the cell length, upper limits of parameters representing quality of service in said call admitted state;
• judging means for judging whether to admit or reject a requested call on the basis of said evaluated quality of service;
• rejecting means for rejecting the requested call when the requested call is judged to be rejected by the judging means;
• and
• admitting means for admitting the requested call when the requested call is judged to be admitted by the judging means.

A cell flow rate monitoring method in an asynchronous transfer mode, comprising the steps of:

• a) storing first data which include information concerning upper bounds of the probability distributions of the number of arrivals for a plurality of values of arrival rate;
• b) determining an upper bound of a probability distribution of an arrival rate;
• c) determining, by using said first data, an upper bound of a probability distribution of a cell length which is given by upper bounds of probability distributions of the number of arrivals along said determined upper bound of the probability distribution of the arrival rate;
• d) determining a threshold value for the cell flow rate at an outgoing line side by using said upper bounds of the probability distributions of the number of arrivals, said upper bound of the probability distribution of the cell length, and said upper bound of the probability distribution of the arrival rate;
• e) judging abnormality in the cell flow rate at the outgoing line side on the basis of said threshold value;
• and
• f) adjusting the number of arrivals when an abnormality is judged to exist.

A cell flow rate monitoring apparatus in an asynchronous transfer mode, comprising:

• first storage means for storing first data which include information concerning upper bounds of the probability distributions of the number of arrivals for a plurality of values or arrival rate;
• arrival rate determining means for determining an upper bound of a probability distribution of an arrival rate;
• cell length determining means for determining, by using said first data, an upper bound of a probability distribution of a cell length which is given by the upper bounds of the probability distributions of the number of arrivals along said determined upper bound of the probability distribution of the arrival rate;
• threshold value determining means for determining a threshold value for the cell flow rate at an outgoing line side by using said upper bounds of the probability distributions of the number of arrivals, said upper bound of the probability distribution of the cell length, and said upper bound of the probability distribution of the arrival rate;
• abnormality judging means for judging abnormality in the cell flow rate at the outgoing line side on the basis of said threshold value;
• and
• means for adjusting the number of arrivals in response to judging by said abnormality judging means that said threshold value is exceeded.

An internetwork connection method, in an asynchronous transfer mode, for connecting a first network to a second network via a user parameter control, comprising the steps of:

• a) storing first data for said first network, said first data including information concerning upper bounds of probability distributions of the number of arrivals for a plurality of values of arrival rate;
• b) determining an upper bound of a probability distribution of an arrival rate in said first network;
• c) determining, by using said first data, an upper bound of a probability distribution of a cell length which is given by upper bounds of probability distributions of the number of arrivals along said determined upper bound of the probability distribution of the arrival rate by using a transition probability matrix containing characteristics of said user parameter control;
• d) determining, by using said upper bound of the probability distribution of the cell length, upper limits of parameters representing the quality of service when said first network is connected to said second network;
• e) judging whether to connect or reject a connection of said first and second networks on the basis of said evaluated quality of service;
• f) rejecting the connection when the connection is judged to be rejected in step e;
• and
• g) connecting said networks when a connection between said networks is judged to be acceptable in step e.

An internetwork connection apparatus, in an asynchronous transfer mode, for connecting a first network to a second network via a user parameter control, comprising:

• first storage means for storing first data for said first network,, said first data including information concerning upper bounds of probability distributions of the number of arrivals for a plurality of values of arrival rate;
• arrival rate determining means for determining an upper bound of a probability distribution of an arrival rate in said first network;
• cell length determining means for determining, by using said first data, an upper bound of a probability distribution of a cell length which is given by the upper bounds of the probability distributions of the number of arrivals along said determined upper bound of the probability distribution of the arrival rate by using a transition probability matrix containing characteristics of said user parameter control;
• parameter determining means for determining, by using said upper bounds of the probability distribution of the cell length, upper limits of parameters representing the quality of service when said first network is connected to said second network;
• judging means for judging whether to connect or reject connection of said first and second networks based on said quality of service;
• rejecting means for rejecting the connection when the connection is judged to be rejected by the judging means;
• and
• connecting means for connecting said first and second networks when the judging means judges a connection is acceptable.