LBR Location Analysis – MIT Dataset (Oct)
I wanted to see what the real picture was when using cell towers for location, so for a run of LBR on the MIT Dataset for October, I collected details about every message hop. I compared the timestamps for the hops to the cell tower information in the database, to find out which cell tower each node involved in the message hop was recorded as using.
Colocated: (same cell) 2247
Not-Colocated: (different cells) 15688
One sided: (only one sees cell) 13452
No data: (no cells seen) 3211
Count: (total number of hops evaluated) 31387
These results are slightly concerning, as roughly half of the hops between nodes happened when nodes reported different locations (cell towers ID), 10% of hops did not record any cell tower information at all, and in 42% of hops, only one node reported a location. This seems to demonstrate that we cannot rely on cell tower information to give us an accurate idea of the co-location of people. However, it might still prove useful to use the cell tower location for generating general mobility statistics, which could be used as routing metrics. Davide mentioned he had some ideas about these sort of statistics.
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