Encoding and compression of a location beacon database
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United States of America Patent
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Mar 10, 2009
Grant Date -
Sep 7, 2006
app pub date -
Mar 1, 2006
filing date -
Mar 4, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A method of delta-encoding and compressing a table containing 6-byte MAC addresses is provided. The MAC addresses are sorted, a first MAC address is stored, and only the binary differences between succeeding MAC addresses are stored. A method of reading a delta-encoded and compressed MAC address table is provided. A first unencoded MAC address is read. The remaining MAC addresses are generated by successively adding stored binary differences to the result of the previous addition. A method of encoding and compressing a location table is provided. A reference latitude and longitude is selected and stored. The offsets from the reference latitude and longitude are stored for the remaining locations. A method of reading an encoded location table is provided. A stored reference latitude and longitude is read. Stored offsets are read and applied to the reference latitude and longitude to generate a set of latitude and longitude locations.
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