Method for detecting mis-insertion of ATM cell, ATM communication system and ATM communication equipment
AssigneeKabushiki Kaisha Toshiba
InventorKoichi Kawabe
Life of this patent
Estimating the term…
Abstract
Utilizing a fact that a header of an ATM cell of which error was not able to be corrected thoroughly by a radio receiver tends to have a certain pattern, a connection designated for a cell having such a certain header pattern is set to insert the particular ATM cell therein, and mis-insertion is detected at an AAL termination section (or an ATM switch) of an ATM communication equipment which is a terminating point of the connection.
Claims12
A method of detecting a mis-insertion of an ATM cell in an ATM communication system using an ATM network having a plurality of ATM communication units disposed for transmitting and receiving ATM cells, comprising:
- setting a special connection, which corresponds to a connection that is not used in a regular operation, in the ATM communication units, for transferring a mis-insertion cell that has become an ATM cell in which a virtual path identifier VPI and a virtual channel identifier VCI have particular values;
- and
- discriminating the mis-insertion of the ATM cell by detecting the mis-insertion cell having the particular VPI and VCI values, which is transferred by the special connection, at a terminating point of the special connection.
An ATM communication system in which a plurality of ATM communication units for transmitting and receiving ATM cells are disposed, comprising:
- special connection setting means, disposed in the ATM communication unit, for setting a special connection which corresponds to a connection that is not used in a regular operation, for transmitting a mis-insertion cell that has become an ATM cell in which a virtual path identifier VPI and a virtual channel identifier VCI have particular values;
- and
- cell mis-insertion discriminating means disposed at a terminating point of the special connection set by the special connection setting means, for discriminating a mis-insertion of the ATM cell having the particular VPI and VCI values by detecting the mis-insertion cell transferred through the special connection.
An ATM communication unit for transmitting and receiving an ATM cell by setting a connection according to a virtual path identifier VPI and a virtual channel identifier VCI, comprising:
- special connection setting means for setting a special connection, which corresponds to a connection that is not used in a regular operation, for transferring a mis-insertion cell that has become an ATM cell in which the virtual oath identifier VPI and the virtual channel identifier VCI have particular values;
- ATM switching means for routing the mis-insertion cell having the particular VPI and VCI values based on the special connection that is set by the special connection setting means;
- an AAL termination section that terminates the special connection set by the special connection setting means;
- cell detecting means for detecting the mis-insertion cell at the AAL termination section;
- and
- cell mis-insertion discriminating means for discriminating the mis-insertion of the ATM cell based on a detection output of the cell detecting means.
Dependencies are inferred from the claim text.