Path computation in wavelength switched optical networks

摘要

A path computation client (PCC) can request a path computation element (PCE) to compute a path across a wavelength switched optical network. PCC sends a request which identifies end nodes. The end nodes can support a plurality of possible values of a transmission parameter, such as modulation format or Forward Error Correction (FEC) type. The PCE computes a path between the end nodes and sends a reply to the PCC. The reply identifies the path between the end nodes and identifies a selected value of the transmission parameter for the computed path. The reply can comprise a spectrum assignment for the path. The reply can be a PCE Communication Protocol (PCEP) Reply message.

主权项

1. A method for servicing a request for path computation at a path computation element in a wavelength switched optical network, the method comprising:
receiving a request from a path computation client for computation of a path between end nodes, the request identifying the end nodes and a transmission parameter that is supported by the end nodes, the transmission parameter including a bit rate and a plurality of modulation formats; determining a plurality of values of the transmission parameter supported by the end nodes; computing one or more paths between the end nodes for the transmission parameter based on meeting a bit error rate (BER) below a set threshold, wherein the computing further comprises selecting one of the values of the transmission parameter that provides the path requiring a minimum number of frequency slots from the one or more paths computed; and sending a reply to the path computation client, wherein the reply identifies the path computed between the end nodes and the reply identifies the selected value of the transmission parameter for the computed path.