Communication system, node device, communication method in the communication system, and program
First Claim
1. A communication system comprising a plurality of node devices,wherein each of said plurality of node devices comprises a controller configured to:
- detect a failure on a first transmission path over which data transmission is being performed;
when said failure exists in a link or a node that is located immediately before its own node, set a single second transmission path as far as a transmission terminal node, said second transmission path that excludes a path from said transmission terminal node to a node that has detected said failure within said first transmission path;
transmit a first failure notification signal as far as said transmission terminal node over said second transmission path;
upon receipt of said first failure notification signal, switch a switch instantly for data transmission so that a path for new data transmission is the same path as a transmission path for said first failure notification signal; and
upon said transmission terminal node receiving said first failure notification signal, switch said switch to said second transmission path and perform a new data transmission over said second transmission path, whereinwhen said second transmission path overlaps with part of said first transmission path, transmit a second failure notification signal, different from the first notification signal, to one or more nodes located downstream of said first transmission path, andupon receipt of said second failure notification signal at a junction node where overlapping between the first transmission path and the second transmission ends, transmit said first failure notification signal from the junction node over said second transmission path.
1 Assignment
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Accused Products
Abstract
A communication system comprises: failure detection means that detects a failure on a first transmission path over which data transmission is being performed; transmission path setting means that, when the failure exists in a link or a node that is located immediately before its own node, sets a second transmission path as far as a transmission terminal node, the second transmission path that excludes a path from the transmission terminal node to a node that has detected the failure within the first transmission path; first failure notification means that transmits a failure notification signal as far as the transmission terminal node over the second transmission path; new path switching means that, upon receipt of the failure notification signal, switches a switch for data transmission so that a path for new data transmission is the same path as a transmission path for the failure notification signal; and data transmission means that, upon the transmission terminal node receiving the failure notification signal, switches the switch to the second transmission path and performs a new data transmission over the second transmission path.
161 Citations
10 Claims
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1. A communication system comprising a plurality of node devices,
wherein each of said plurality of node devices comprises a controller configured to: -
detect a failure on a first transmission path over which data transmission is being performed; when said failure exists in a link or a node that is located immediately before its own node, set a single second transmission path as far as a transmission terminal node, said second transmission path that excludes a path from said transmission terminal node to a node that has detected said failure within said first transmission path; transmit a first failure notification signal as far as said transmission terminal node over said second transmission path; upon receipt of said first failure notification signal, switch a switch instantly for data transmission so that a path for new data transmission is the same path as a transmission path for said first failure notification signal; and upon said transmission terminal node receiving said first failure notification signal, switch said switch to said second transmission path and perform a new data transmission over said second transmission path, wherein when said second transmission path overlaps with part of said first transmission path, transmit a second failure notification signal, different from the first notification signal, to one or more nodes located downstream of said first transmission path, and upon receipt of said second failure notification signal at a junction node where overlapping between the first transmission path and the second transmission ends, transmit said first failure notification signal from the junction node over said second transmission path. - View Dependent Claims (2, 3)
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4. A node device comprising a controller configured to:
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detect a failure on a first transmission path over which data transmission is being performed; when said failure exists in a link or a node that is located immediately before its own node, set a single second transmission path as far as a transmission terminal node, said second transmission path that excludes a path from the transmission terminal node to a node that has detected said failure within said first transmission path; transmit a first failure notification signal as far as said transmission terminal node over said second transmission path; and upon receipt of said first failure notification signal, switch a switch instantly for data transmission so that a path for new data transmission is the same path as a transmission path for said first failure notification signal, wherein when said second transmission path overlaps with part of said first transmission path, transmit a second failure notification signal, different from the first notification signal, to one or more downstream nodes over said first transmission path, and upon receipt of said second failure notification signal at a junction node where overlapping between the first transmission path and the second transmission ends, transmit said first failure notification signal from the junction node over said second transmission path. - View Dependent Claims (5, 6)
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7. A communication method in a communication system comprising:
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detecting a failure on a first transmission path over which data transmission is being performed; when said failure exists in a link or a node that is located immediately before its own node, setting a single second transmission path as far as a transmission terminal node, said second transmission path that excludes a path from said transmission terminal node to a node that has detected said failure within said first transmission path; transmitting a first failure notification signal as far as said transmission terminal node over said second transmission path; upon receipt of said first failure notification signal, switching a switch instantly for data transmission so that a path for new data transmission is the same path as a transmission path for said first failure notification signal; and upon said transmission terminal node receiving said failure notification signal, switching said switch to said second transmission path and performing a new data transmission over said second transmission path, wherein when said second transmission path overlaps with part of said first transmission path, transmitting a second failure notification signal, different from the first notification signal, to one or more nodes located downstream of said first transmission path, and upon receipt of said second failure notification signal at a junction node where overlapping between the first transmission path and the second transmission ends transmitting said first failure notification signal from the junction node over said second transmission path. - View Dependent Claims (8, 9)
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10. A non-transitory computer readable medium embedded with a computer program product comprising computer executable code, which when executed, causes a computer to execute:
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detecting a failure on a first transmission path over which data transmission is being performed; when said failure exists in a link or a node that is located immediately before its own node, setting a single second transmission path as far as a transmission terminal node, said second transmission path that excludes a path from said transmission terminal node to a node that has detected said failure within said first transmission path; transmitting a failure notification signal as far as said transmission terminal node over said second transmission path; upon receipt of said failure notification signal, switching a switch instantly for data transmission so that a path for new data transmission is the same path as a transmission path for said failure notification signal; and upon said transmission terminal node receiving said failure notification signal, switching said switch to said second transmission path and performing a new data transmission over said second transmission path, wherein when said second transmission path overlaps with part of said first transmission path, transmitting a second failure notification signal, different from the first notification signal, to one or more nodes located downstream of said first transmission path, and upon receipt of said second failure notification signal at a junction node where overlapping between the first transmission path and the second transmission ends, transmitting said first failure notification signal from the junction node over said second transmission path.
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Specification