Shared wavelength group to differentiate label switched paths for congestion control in optical burst switching networks
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United States of America Patent
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Issued Date -
Oct 9, 2003
app pub date -
Apr 3, 2002
filing date -
Apr 3, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A technique is described for differentiating LSPs that contribute to congestion at an OBS node by defining Shared Wavelength Groups ('SWGs') that dedicate a certain group of wavelengths to each LSP. In one embodiment, during establishment of an LSP, an upstream OBS node suggests an SWG to support bidirectional wavelength conversion for bidirectional LSPs. While suggesting the wavelengths for the SWG, the upstream OBS node calculates the effective bandwidth of each wavelength to select the less-occupied wavelengths for the SWG. The downstream OBS nodes allocate the SWG hop-by-hop during transmission of the generalized label upstream. In one embodiment, an LSP is flagged as contributing to congestion only if the SWG of the LSP overlaps with the SWG of a congested LSP. In an alternative embodiment, an LSP is flagged as contributing to congestion only if the overlap between the SWG of that LSP and the SWG of the congested LSP exceeds a predetermined threshold.
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