Planning of optical connections in a WDM optical network

摘要

An exemplary technique is provided for planning a plurality of optical connections as a function of a plurality of traffic demand. In a routing step, a loopless network path is allocated to each traffic demand. Each traffic demand is allocated to a candidate optical connection or chain of candidate optical connections selected to carry the capacity of the traffic demand along the loopless network path allocated to the traffic demand. In an optimization step, a reduced set of candidate optical connections is defined by withdrawing the candidate optical connection to be withdrawn. A candidate optical connection or a chain of candidate optical connections is determined to be re-used among the reduced set of candidate optical connections. The traffic demand is re-allocated to the candidate optical connection or chain of candidate optical connections to be re-used.

主权项

1. A method for planning a plurality of optical connections in an optical network as a function of a plurality of traffic demands, wherein each traffic demand comprises a pair of end nodes and a capacity, the method comprising:
in a routing step:
to each traffic demand, allocating a loopless network path that connects the pair of end nodes of the traffic demand;defining a set of candidate optical connections suitable for fulfilling all the traffic demands, wherein the candidate optical connections are continuous connections in a transport layer of the optical network, and wherein each candidate optical connection comprises a transmission capacity and a connection path that corresponds to one of:
the loopless network path allocated to a traffic demand,a subpath of the loopless network path allocated to a traffic demand,allocating each traffic demand to a candidate optical connection or a chain of candidate optical connections selected to carry the capacity of the traffic demand between the end nodes of the traffic demand along the loopless network path allocated to the traffic demand; and in an optimization step:
selecting a candidate optical connection to be withdrawn among the set of candidate optical connections;defining a reduced set of candidate optical connections by withdrawing the candidate optical connection to be withdrawn; for each traffic demand allocated to the candidate optical connection to be withdrawn,
determining a candidate optical connection or a chain of candidate optical connections to be re-used among the reduced set of candidate optical connections, so that the candidate optical connection or chain of candidate optical connections to be re-used has a free-capacity adapted to carry the capacity of the traffic demand between the end nodes of the traffic demand;re-allocating the traffic demand to the candidate optical connection or chain of candidate optical connections to be re-used;detecting that all the traffic demands allocated to the candidate optical connection to be withdrawn have been re-allocated; and providing the reduced set of candidate optical connections.