Personal Location Area (PLA)
The personal location area (PLA) of u at time τ, is defined as the set of all cells, x, such that the vertex (x, τ) in the mobility graph is a NR vertex, and is connected to the vertex (X0, 0) through a feasible roaming path.
The paging algorithm is subject to one-phase paging delay: when a paging event occurs, the user is paged simultaneously in all the cells belonging to the PLA.