The present document defines the stage 3 specifications of the Supplementary Service Dynamic Group Number
Assignment (SS-DGNA) for the Terrestrial Trunked Radio (TETRA).
The SS-DGNA enables a user to dynamically define group identities and group related parameters to the TETRA
system and to the subscribers in the system. These definitions are used to enable group call invocations to dynamically
defined groups. The SS-DGNA specification defines the creation, modification, deletion and interrogation of group
definitions in the Switching and Management Infrastructure (SwMI), in the Mobile Station (MS).
The present document does not include the specification for access priority used for random access in uplink and call
priority used by SwMI for resource allocation in a group call. Access priority and call priority can be specified and
applied for groups using Supplementary Services Access Priority (SS-AP), Priority Call (SS-PC) and Pre-emptive
Priority Call (SS-PPC). Thus, the definition procedure of these priorities is outside the scope of the present document.
Man-Machine Interface (MMI) and charging principles are also outside the scope of the present document.
Supplementary service stage 3 specification is preceded by the stage 1 and the stage 2 specifications of the service.
Stage 1 describes the functional capabilities from the users point of view. Stage 2 defines the functional behaviour in
terms of functional entities and information flows. Stage 3 gives the precise description of the supplementary service
from the implementation point of view. It defines the protocols for the service and the encoding rules for the
information flows. It defines the processes for the functional entities and their behaviour. The described protocols and
their behaviour apply for the SwMI and for the MS and can be applied over the Inter-System Interface (ISI) between
TETRA systems.