Location-Aware POI Recommendation for Indoor Space by Exploiting WiFi Logs

Algorithm 1

Generating indoor spatiotemporal trajectory.

Require: () User-generated WiFi logs ; () POI

     fingerprint set ,

Ensure: Indoor spatio-temporal trajectory Traj.

()   Initial user trajectory .

()    Obtain the time set that user walks through

      POIs entrance according to RSSI variation.

()     Split into a subsequence set .

()   for do

()       Initial POI set .

()       for do

()              Obtain the corresponding POI at time using nearest

                 neighbour.

()              Add to .

()       end for

()    Find the element with the most times in .

()    Obtain the timestamp

()    Construct triple and add to trajectory

               .

() end for

() return Indoor Spatio-temporal trajectory .