Method for optimizing a mostly optical network
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorTibor Clinkler
Life of this patent
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Abstract
Method for forming the virtual topology (21-45) of an ATM-layer where the ATM-layer is carried over an optical network (1) where inputs such as the physical topology (2-8, 11-16) and constraints of physical nature are given, thereafter forming node-pairs with end-to-end connections according to some known optimal routing algorithm, and finally applying a non-deterministic mathematical approach to obtain an optimal virtual topology with the objective of minimising the need for necessary electrical processing (50, 60, 70, 80) in the nodes (11-16) of the network (1).
Claims4
A method for optimizing the routing of a data stream using Asynchronous Transfer Mode (ATM) over an optical network employing Wavelength Division Multiplexing (WDM), wherein said network comprises a plurality of nodes interconnected by physical links comprised of optical transmission media suitable for carrying data at a plurality of carrier wavelengths, said method comprising the steps of:
- determining the number of hops for a plurality of logical links between pairs of said nodes, wherein each logical link is associated with a distinct Virtual Path Channel (VPC);
- assigning a first carrier wavelength to each logical link having only one hop;
- and
- for each logical link having more than one hop, i) employing a non-deterministic algorithm with the objective function of minimizing the total number of hops to separate each logical link into a sequence of logical link portions, or Virtual Path Links (VPLs);
- ii) selectively grouping at least a first VPL associated with a first VPC with a second VPL associated with a second VPC to form Virtual Paths (VPs) between adjacent ones of said nodes;
- and iv) assigning a second carrier wavelength to each said VP.
Dependencies are inferred from the claim text.