Method for transmitting a presence map of mobile terminals connected by a communication session to a mobile network covering a plurality of location areas, implemented by an appliance (GMLC, MMEi) of the mobile network capable of collecting items of information about the location of mobile terminals, the method being characterized in that it comprises: - a prior step (E3, F3b) of obtaining an item of so-called area information, originating from an appliance (PCRF) of the mobile network capable of applying a session-processing rule to a terminal according to at least its location area, the item of area information comprising at least one item of information related to the existence of at least one area among the plurality of location areas, called a special area, with which a special session-processing rule is associated, - at least one iterative step of updating a presence map (CP1, CP2) associating location area identifiers with terminal identifiers, the step comprising the following steps: ∘ collecting an item of terminal location information, comprising a location area identifier of this terminal, ∘ searching (E4, F4a), in the item of area information, for the existence of a special area corresponding to the identifier of said location area, and, ∘ when the special area exists, adding (E4, F4a) the terminal identifier and the location area identifier to the terminal presence map, - and a step (E5, F3c) of transmitting the terminal presence map (CP1, CP2) to the appliance (PCRF) of the mobile network capable of applying a session-processing rule to a terminal according to at least its location area. - a prior step (E3, F3b) of obtaining an item of so-called area information, originating from an appliance (PCRF) of the mobile network capable of applying a session-processing rule to a terminal according to at least its location area, the item of area information comprising at least one item of information related to the existence of at least one area among the plurality of location areas, called a special area, with which a special session-processing rule is associated, - at least one iterative step of updating a presence map (CP1, CP2) associating location area identifiers with terminal identifiers, the step comprising the following steps: ∘ collecting an item of terminal location information, comprising a location area identifier of this terminal, ∘ searching (E4, F4a), in the item of area information, for the existence of a special area corresponding to the identifier of said location area, and, ∘ when the special area exists, adding (E4, F4a) the terminal identifier and the location area identifier to the terminal presence map, ∘ collecting an item of terminal location information, comprising a location area identifier of this terminal, ∘ searching (E4, F4a), in the item of area information, for the existence of a special area corresponding to the identifier of said location area, and, ∘ when the special area exists, adding (E4, F4a) the terminal identifier and the location area identifier to the terminal presence map, - and a step (E5, F3c) of transmitting the terminal presence map (CP1, CP2) to the appliance (PCRF) of the mobile network capable of applying a session-processing rule to a terminal according to at least its location area.