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Slot-Cache for Caching Aggregates of Data with Different Expiry Times

  • US 20080247313A1
  • Filed: 04/03/2007
  • Published: 10/09/2008
  • Est. Priority Date: 04/03/2007
  • Status: Active Grant
First Claim
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1. A method comprising:

  • constructing an index of a plurality of nodes associated with sensors, the plurality of nodes including leaf nodes and internal nodes, wherein the internal nodes include caches having multiple cache slots for storing sensor data having different expiry times;

    receiving a query requesting sensor data corresponding to a selected spatial region, wherein the query includes a specified expiry time for the sensor data;

    traversing through the index to identify nodes associated with a set of sensors in the selected spatial region; and

    obtaining the sensor data having an expiry time greater than the specified expiry time.

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