General

The present document defines the general aspects of interworking at the Inter-System Interface (ISI) for Terrestrial 
Trunked Radio (TETRA) system supporting Voice plus Data (V+D). Those specify the general concepts which are the 
basis of the ISI operation between TETRA systems. It introduces the Additional Network Features (ANFs) used at 
the ISI, and specifies: 
• the general protocol mechanism upon which the definition of each ANF is based; and 
• the security related functions over the ISI. 
The specification of the general transport layer independent protocol mechanism applies to any TETRA Switching and 
Management Infrastructure (SwMI) which supports the ISI. The security requirements for the ISI only apply to SwMIs 
which support authentication or end-to-end encryption over the ISI. 
Besides the ISI general design, the present sub-part, interworking at the Inter-System Interface comprises the following 
other sub-parts: 
• General design, PSS1 over E.1 [3]; 
• General design, SIP/IP [4]; 
• Transport layer independent Additional Network Feature Individual Call (ANF-ISIIC) [5]; 
• Transport layer independent Additional Network Feature Group Call (ANF-ISIGC) [6]; 
• Transport layer independent Additional Network Feature Short Data Service (ANF-ISISDS) [7]; 
• Transport layer independent Additional Network Feature, Mobility Management (ANF-ISIMM) [8]; and 
• Generic Speech Format Implementation [9]

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 user's 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.

The present document defines the stage 3 specifications of the Supplementary Service Pre-emptive Priority Call  
(SS-PPC) for the Terrestrial 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 pre-empt resources needed for higher priority calls and the capability to pre-empt 
users from ongoing calls in order to move them to higher priority calls. SS-PPC specifies the definition, activation, 
deactivation and interrogation for the usage of pre-emptive call priorities in the TETRA system. The Switching and 
Management Infrastructure (SwMI) applies the SS-PPC priorities when it allocates the resources for calls. The SS-PPC 
operations are defined for the SwMI and for the Mobile Station (MS). 
SS-PPC is defined to 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-PPC is invoked for calls within 
one TETRA system or for calls that extend over ISI to several TETRA systems. 
Man-Machine Interface (MMI) and charging principles are 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 user's point of view. Stage 2 defines the functional behaviour in 
terms of Functional Entities (FEs) and information flows. Stage 3 gives a precise description of the supplementary 
service from the implementation point of view. It defines the protocol for the service and the encoding rules for the 
information flows. It defines the processes for the FEs and their behaviour. The described protocols and behaviour 
apply to the SwMI, for the MS and may be applied over the ISI between TETRA systems. Aspects relating to all 
supplementary services are detailed in ETSI EN 300 392-9 [3].

The present document defines the mobility management of interworking at the Inter-System Interface (ISI) for 
Terrestrial Trunked Radio (TETRA) system supporting Voice plus Data (V+D). 
The TETRA V+D Inter-working - basic operation part defines the Inter-System Interface (ISI) between the SwMIs as 
specified in the following sub-parts: 
• Transport layer independent, General design [i.5]. 
• General design, PSS1 over E.1 [13]. 
• General design, SIP/IP [i.6]. 
• Transport layer independent Additional Network Feature Individual Call (ANF-ISIIC) [9]. 
• Transport layer independent Additional Network Feature Group Call (ANF-ISIGC) [10]. 
• Transport layer independent Additional Network Feature Short Data Service (ANF-ISISDS) [i.2]. 
• Transport layer independent Additional Network Feature, Mobility Management (ANF-ISIMM) (the present 
document). 
• Generic Speech Format Implementation [i.4]. 
NOTE: These TSs are produced in analogy with Recommendation ITU-T I.130 [4]. 
The present document contains the ANF-ISIMM part. The ANF-ISIMM part defines additional Mobility Management 
(MM) services to the SwMIs. If supported, the ANF-ISIMM services complement the intra-SwMI-MM, authentication 
and key management services. In support of these, the ANF-ISIMM enables the invocation and operation of these 
services between the SwMIs over the ISI. Thus, ANF-ISIMM offers the following services: 
• Migration and restricted migration. 
• Individual subscriber and group profile update. 
• Supplementary Service profile update. 
• De-registration. 
• Group attachment/detachment. 
• Linked group attachment/detachment. 
• Individual subscriber and group database recovery. 
• Authentication, one-directionally or mutually between the individual subscriber and the home SwMI. 
• Over-The-Air-Re-keying (OTAR) for Static Cipher Key (SCK) generation and SCK delivery. 
For the following service are only included in the stage 1 descriptions: 
• Group Linking/unlinking. 
• GTSI attachment/detachment to a linking participating group from another SwMI.