Research Article
Time in Privacy Preserving LBSs: An Overlooked Dimension
| | A spatial region | | Set of users having footprints in | | Entropy of region | | Popularity of region | | th time period, | | Number of periods from system start-up | | th time slice of a period | | , number of slices composing a period | | Time frame = | | Entropy of region , during time slice of time period | | Popularity of region , for time frame | | Generic th user of a set of users, , | | Generic th user who have footprints in in time frame | | Number of footprints of user in | | Number of footprints of user in in time frame | | Total number of footprints in a region |
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