Method of controlling data transmission in ATM network with cell loss priority level

Claim 1

A method of controlling data transmission in an Asynchronous Transfer Mode (ATM) network, in which data are transmitted in units of cells, a group of cells are transmitted from a terminal to the network by setting up a virtual channel, and a plurality of virtual channels are multiplexed at the network, comprising the steps of: providing a cell loss priority field in each cell to be transmitted with a cell loss priority level for distinguishing loss tolerable cells and loss intolerable cells, by a terminal; declaring from the terminal to the network a traffic characteristic for the loss intolerable cells with a higher cell loss priority level in each virtual channel to be set up at a time of a connection set up request; and carrying out at the network a connection admission control by estimating a cell loss rate for the loss intolerable cells on a basis of the traffic characteristic declared at the declaring step, such that only the cell loss rate for the loss intolerable cells in the multiplexed virtual channels is secured by the network on a basis of the estimated cell loss rate for the loss intolerable cells.

Claim 2

A method of controlling data transmission in an Asynchronous Transfer Mode (ATM) network, in which data are transmitted in units of cells, a group of cells are transmitted from a terminal to the network by setting up a virtual channel, and a plurality of virtual channels are multiplexed at the network, comprising the steps of: providing a cell loss priority field in each cell to be transmitted with a cell loss priority level for distinguishing loss tolerable cells and loss intolerable cells, by a terminal; declaring from the terminal to the network a traffic characteristic for the loss intolerable cells with a higher cell loss priority level in each virtual channel to be set up at a time of a connection set up request; and carrying out at the network a connection admission control by estimating a cell loss rate for the loss intolerable cells on a basis of the traffic characteristic declared at the declaring step, such that only the cell loss rate for the loss intolerable cells in the multiplexed virtual channels is secured by the network on a basis of the estimated cell loss rate for the loss intolerable cells.

Claim 7

A method of controlling data transmission in an Asynchronous Transfer Mode (ATM) network, in which data are transmitted in units of cells, a group of cells are transmitted from a terminal to the network by setting up a virtual channel, and a plurality of virtual channels are multiplexed at the network, comprising the steps of: providing a cell loss priority field in each cell to be transmitted with a cell loss priority level for distinguishing loss tolerable cells and loss intolerable cells, by a terminal; declaring from the terminal to the network traffic characteristics for the loss intolerable cells with a higher cell loss priority level and the loss tolerable cells with a lower cell loss priority level in each virtual channel to be set up at a time of a connection set up request; and carrying out at the network a connection admission control by estimating cell loss rates for the loss intolerable cells and the loss tolerable cells separately on a basis of the declared traffic characteristics, such that the cell loss rates for the loss intolerable cells and the loss tolerable cells in the multiplexed virtual channels are secured separately by the network on a basis of the estimated cell loss rates for the loss intolerable cells and the loss tolerable cells.

Claim 8

A method of controlling data transmission in an Asynchronous Transfer Mode (ATM) network, in which data are transmitted in units of cells, a group of cells are transmitted from a terminal to the network by setting up a virtual channel, and a plurality of virtual channels are multiplexed at the network, comprising the steps of: providing a cell loss priority field in each cell to be transmitted with a cell loss priority level for distinguishing loss tolerable cells and loss intolerable cells, by a terminal; declaring from the terminal to the network traffic characteristics for the loss intolerable cells with a higher cell loss priority level and the loss tolerable cells with a lower cell loss priority level in each virtual channel to be set up at a time of a connection set up request; and carrying out at the network a connection admission control by estimating cell loss rates for the loss intolerable cells and the loss tolerable cells separately on a basis of the declared traffic characteristics, such that the cell loss rates for the loss intolerable cells and the loss tolerable cells in the multiplexed virtual channels are secured separately by the network on a basis of the estimated cell loss rates for the loss intolerable cells and the loss tolerable cells.

Claim 13

A method of controlling data transmission in an Asynchronous Transfer Mode (ATM) network, in which data are transmitted in units of cells, a group of cells are transmitted from a terminal to the network by setting up a virtual channel, and a plurality of virtual channels are multiplexed at the network, comprising the steps of: providing a cell loss priority field in each cell to be transmitted with a cell loss priority level for distinguishing loss tolerable cells and loss intolerable cells, by a terminal; declaring from the terminal to the network a ratio of numbers of the loss intolerable cells with a higher cell loss priority level and the loss tolerable cells with a lower cell loss priority level in each virtual channel to be set up at a time of a connection set up request; classifying at the network the virtual channels into a plurality of virtual channel classes according to the ratio declared at the declaring step; dividing at the network a communication resource into a plurality of sub-resources in correspondence with the plurality of the virtual channel classes; and carrying out at the network a connection admission control for each of the virtual channel classes classified at the classifying step separately.

Claim 14

A method of controlling data transmission in an Asynchronous Transfer Mode (ATM) network, in which data are transmitted in units of cells, a group of cells are transmitted from a terminal to the network by setting up a virtual channel, and a plurality of virtual channels are multiplexed at the network, comprising the steps of: providing a cell loss priority field in each cell to be transmitted with a cell loss priority level for distinguishing loss tolerable cells and loss intolerable cells, by a terminal; declaring from the terminal to the network a ratio of numbers of the loss intolerable cells with a higher cell loss priority level and the loss tolerable cells with a lower cell loss priority level in each virtual channel to be set up at a time of a connection set up request; classifying at the network the virtual channels into a plurality of virtual channel classes according to the ratio declared at the declaring step; dividing at the network a communication resource into a plurality of sub-resources in correspondence with the plurality of the virtual channel classes; and carrying out at the network a connection admission control for each of the virtual channel classes classified at the classifying step separately.