Regenerators placement mechanism for wavelength switched optical networks
View Patent ↗The method of placing regenerators along a trail connecting a source network node with a destination network node of an automatically switched optical network first identifies N tentative regeneration sites and n+1 optical paths along the trail. Wavelengths are assigned to each optical path, and the performance of the trail is assessed based on regenerator placement data and wavelength assignment data.
1. A method of establishing a connection between a source node and destination node of an automatically switched optical network in response to a connection request from a user, comprising:
(a) engineering a regenerator path between said source and destination nodes including a first route and a wavelength-upgraded variant of the first route, based on current network configuration, network performance and on constraints in said request from the user; and
(b) attempting to establish said connection along said first route of the regenerator path, wherein upon failure of the first route, connection is attempted along said wavelength-upgraded variant of said first route.
2. The method as claimed in claim 1 , further comprising:
(c) during step (b) engineering a further regenerator path including a second route and a wavelength-upgraded variant of the second route between said source and destination nodes while attempting to establish a connection using previously-engineered paths; and
(d) if step (b) fails, attempting to establish said connection along said further regenerator path.
3. The method as claimed in claim 2 , further comprising (e) repeating steps (a) to (d) for a still further regenerator path until a connection is successfully established.
4. The method as in claim 1 wherein the resources comprise wavelengths and regenerators.
5. A method of establishing a connection between a source node and destination node of an automatically switched optical network in response to a connection request, comprising:
(a) modifying a transmission wavelength in a first route segment of a regenerator path between a source and destination node, including a wavelength-upgraded variant of the first route segment, based on current network configuration, network performance and constraints in a connection request; and
(b) attempting to establish a connection between the source node and destination node along the first route segment, wherein upon failure of the first route segment, a connection is attempted along the wavelength-upgraded variant of the first route segment.
6. A network management hardware system for establishing a connection between a source node and destination node of an automatically switched optical network in response to a connection request, the system operable to:
(a) modify a transmission wavelength in a first route segment of a regenerator path between a source and destination node, including a wavelength-upgraded variant of the first route segment, based on current network configuration, network performance and constraints in a connection request; and
(b) attempt to establish a connection between the source node and destination node along the first route segment, wherein upon failure of the first route segment, the system is further operable to attempt a connection along the wavelength-upgraded variant of the first route segment.