Systems and methods for service availability determination in packet networks
AssigneeCiena Corporation
InventorsAditya Mittal, Ashutosh Aggarwal, Rajneesh Mishra
Life of this patent
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Abstract
Service availability determination systems and methods include determining availability of a packet service in a Maintenance Interval (MI) based on frame loss measurements in short intervals Δt and marking each Δt as available or unavailable based on the frame loss measurements and an associated Frame Loss Ratio (FLR) threshold, wherein each Δt is a High Loss interval (HLI) when exceeding the FLR threshold; utilizing a sliding window of size n, n being an integer, to determine whether the packet service is available or unavailable; and utilizing an extension period after an end of the MI with the sliding window to ensure all Δt's in the MI are marked as available or unavailable.
Claims18
A service availability determination method implemented in a packet network element, comprising:
- determining availability of an Ethernet Virtual Circuit (EVC) in a Maintenance Interval (MI) based on frame loss measurements in short intervals Δt and marking each Δt as available or unavailable based on the frame loss measurements and an associated Frame Loss Ratio (FLR) threshold, wherein each Δt is a High Loss Interval (HLI) when exceeding the FLR threshold;
- utilizing a sliding window of size n, n being an integer, to determine whether the EVC is available or unavailable;
- and
- utilizing an extension period of time after an end of the MI with the sliding window to ensure all Δt's in the MI are marked as available or unavailable,
- wherein the extension period is between 0 and (n−1) times a length of each Δt.
A packet network element comprising:
- one or more ports;
- a switching fabric configured to switch packets between the one or more ports;
- and
- a controller configured to
- determine availability of an Ethernet Virtual Circuit (EVC) in a Maintenance Interval (MI) based on frame loss measurements in short intervals Δt and marking each Δt as available or unavailable based on the frame loss measurements and an associated Frame Loss Ratio (FLR) threshold, wherein each Δt is a High Loss Interval (HLI) when exceeding the FLR threshold,
- utilize a sliding window of size n, n being an integer, to determine whether the EVC is available or unavailable, and
- utilize an extension period of time after an end of the MI with the sliding window to ensure all Δt's in the MI are marked as available or unavailable,
- wherein the extension period is between 0 and (n−1) times a length of each Δt.
A packet network element comprising:
- one or more ports;
- a switching fabric configured to switch packets between the one or more ports;
- and
- a controller configured to
- determine availability of an Ethernet Virtual Circuit (EVC) in a Maintenance Interval (MI) based on frame loss measurements in short intervals Δt and marking each Δt as available or unavailable based on the frame loss measurements and an associated Frame Loss Ratio (FLR) threshold, wherein each Δt is a High Loss Interval (HLI) when exceeding the FLR threshold,
- utilize a sliding window of size n, n being an integer, to determine whether the EVC is available or unavailable, and
- utilize an extension period of time after an end of the MI with the sliding window to ensure all Δt's in the MI are marked as available or unavailable,
- wherein, at an end of the MI, if a current availability state is unavailable and the last Δt is not an HLI, the extension period is utilized until there is an HLI interval or n−1 Δt's allowing a last Δt of the MI to be marked as available.
Dependencies are inferred from the claim text.