Radio Equipment and Systems (RES); Trans-European Trunked Radio (TETRA); Voice Plus Data (V+D); Part 11: Supplementary Services (SS) Stage 2; Part 11-10: Priority Call (PC)
This ETS defines the stage 2 specifications of the Supplementary Service Priority Call (SS-PC) for the Trans-European Trunked Radio (TETRA). The SS-PC is defined to enable a user to have preferential access to the network resources in a TETRA system in times of congestion. The SS-PC specifies the definition@ activation@ deactivation and interrogation for the usage of low and high call priorities in the TETRA system. The SS-PC operations are defined for Switching and Management Infrastructure (SsMI)@ for the Mobile Station (MS) and for the Line Station (LS). SS-PC is defined for subscribers of one TETRA system@ but the subscribers may be located in several TETRA systems and the information flows may be delivered over the Inter System Interface (ISI). SS-PC may also be invoked for basic services within one TETRA system or for basic services that extent over ISI to several TETRA systems. The pre-emptive priorities@ Man-Machine Interface (MMI) and charging principles are outside of the scope of this ETS. Stage 2 describes the functional capabilities of the supplementary service introduced in stage 1 description. Stage 2 identifies the functional capabilities for the management and operation of the service in the SwMI@ in the MS and in the LS. Stage 2 describes also the information flows exchanged between these entities and the flows sent over the ISI. NOTE: The stage 2 description is followed by the stage 3 description@ which specifies the encoding rules for the information flows and process behaviour for the different entities in the SwMI@ the MS and LS.