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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.