irements need more flexibility. Flexibility brings in the necessity for more parametrization. Then the high number of parameters makes the given optimization prob- lems more difficult. Under the scope of these problems, the topic of waveform parameter Feedback information and optimization results Numerology selection or Waveform processing based on the assignment for each user user numerology association Numerology information for all users Subcarrier Feedback information and spacings for How much all users optimization results guards and redundancies? Resource allocation between all Optimization(s) for numerology assignment, waveform processing, users Possible resource allocation and resource allocation regarding the available resources Optimization results Figure 7.2 Illustrations of the given subproblems and their example relationships. 7 Multi-Numerology Waveform Parameter Assignment in 5G assignment has relationships with the other multi-numerology subjects and some of the relationships are provided in Section 7.1.2 from a wider perspective. 7.1.2 Literature Review We can relate different multi-numerology studies [6] with the waveform parameter assign- ment. Multi-numerology studies can be grouped as (i) general multi-numerology concept, (ii) INI and non-orthogonality issues, (iii) time-domain analysis of multi-numerology signals, and (iv) scheduling and resource allocation. Figure 7.3 shows the relation- ships between different topics for multi-numerology waveforms. Waveform parameter assignment can be done regarding the information on requirements and frame design considerations for multiple numerologies (Group-1). Therefore, relationships between the multi-numerology structures defined in standards and different requirements with frame design considerations should be established properly. Meanwhile, INI analysis and the related non-orthogonality issues (Group-2) are important feedbacks for waveform param- eter assignment. INI is a strong drawback considering the resulting non-orthogonality. Time-domain an