This European Telecommunication Standard (ETS) defines the stage 2 specifications of the Supplementary Service Pre-emptive Priority Call (SS-PPC) for the Trans-European Trunked Radio (TETRA). SS-PPC enables a user to have preferential access to the network resources in a TETRA system in times of congestion including pre-emption of calls. SS-PPC is applicable for pre-emptive priorities including the emergency priority. SS-PPC includes the capability to re-empt resources needed for higher priority calls and the capability to preempt users from ongoing call
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