A management method is described, the management method implemented by a core network entry device. The method comprises, for at least one terminal connected to the mobile access network via an access point, following the receipt of an NAS request from the terminal, detecting whether a contention period is associated with this terminal. If not, a contention period to be applied for sending NAS requests to the network core is associated with and transmitted to the terminal. If a contention time is associated with the terminal and has not been respected by the terminal a temporary identifier allocated to the terminal for communicating with the network core is sent to the terminal via the access point, and a control message comprising at least a part of the temporary identifier is sent to the access point, the control message requiring blocking by the access point of all or part of the requests sent by a terminal which contains at least one part of the temporary identifier.