scope:

The present document specifies the Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) pro forma for the VoLTE/ViLTE interoperability test description over 4G/early 5G in physical/virtual environments in compliance with the relevant requirements and in accordance with the relevant guidance given in ISO/IEC 9646-7 [i.3] and ETSI ETS 300 406 [i.4].

The test notation used in the ATS is TTCN-3 (see ETSI ES 201 873-1 [i.5]).

The following test specification and design considerations can be found in the body of the present document:

• the overall test suite structure;

• the testing architecture;

• the test methods and port definitions;

• the test configurations;

• TTCN styles and conventions;

• the partial PIXIT pro forma;

• the modules containing the TTCN-3 ATS.

Annex A provides the Partial Implementation Extra Information for Testing (PIXIT) pro forma.

Annex B provides the Abstract Test Suite (ATS) part of the ATS.