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E20150320 Disclosure Number: IPCOM000243849D
Publication Date: 2015-Oct-21
Document File: 2 page(s) / 34K

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Elster Solutions, LLC

208 S. Rogers Lane, Raleigh, NC 27610

Inventors:  Churan Sa, Chet Helms, Scan Scoggins, Mark Ranta, Richard Rekoske, Andrew Borleske

E20150320 -- Efficient Interval data gap-filling process


This describes a bandwidth-efficient method for delivering interval data from a metering device to an AMI head-end system (HES) while ensuring no gaps in interval data are seen by systems that consume interval data from the HES. The method has these advantages:

I) The end device must only transmit newly recorded interval data periodically, and the period need not be known to the HES.

2) The device may transmit new interval data at any time (can be event driven as opposed to schedule driven).

3) Reduces network traffic by not requiring an acknowledgement for each transmission to more efficiently utilize the available bandwidth in bandwidth-constrained networks.

4) The HES is responsible for maintaining historical state regarding gaps, not the end device - the end device just records data as it is measured.

5) When gaps in the data stream are detected by the HES, the "gap filling" process initiated is not coupled to, and does not depend on or interfere with, the normal scheduled transmission of data by the end device- in fact these could be handled by separate processes at the device and at the HES.

6) The HES can ensure all gaps are filled before publishing data to other systems, or can "give up" after a certain time and publish the data as-is.

7) Gap-filling operations, if urgent, can be prioritized urgently in the network.


To more efficiently utilize the network and reduce the amount of data traffic, end devices may push interval data periodically to an AMI head end system. When devices push interval data to AMI head end system, packets could be lost over the network. The head end system needs a way to ensure no gap in interval data.  Interval data logs in devices have sequence numbers that are used to keep the data in order. Because of these sequence numbers, AMI head end system does not have to acknowledge receipt of interval data. Acknowledg...