International Journal of Vehicular Technology / 2011 / Article / Tab 1

Research Article

Time in Privacy Preserving LBSs: An Overlooked Dimension

Table 1

Notation table.

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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