This thesis was done for the Nokia Mobile Network (MN) L1 organization. The objective of the thesis was to study feature splitting and sub feature refinement processes and study how to improve the long lead time of SW development entity items, which are used by the MN L1 organization. The problem statement was that it takes several SW development feature builds before it is possible to start testing the functionality of the feature. In many earlier customer features sub feature splitting and refinement were not done based on the latest MN way of working processes, and SW development entity items were split horizontally by different components, instead of vertically based on e-2-e feature functionality point of view.

The actual study was carried out using three selected 5G FOT pilot features in the 22R1 System program. During the pilot features, it was tested and assessed how the actual feature splitting and sub feature refinement processes are working in practice based on the Nokia MN processes and guidelines, and if any improvements and/or process changes are required.

The outcome of this study is that the feature splitting and sub feature refinement SW Development processes mainly exist, but the processes are not well known by different MN organizations. Based on that, new training and communication sessions are recommended to improve the current situation. Also based on defined KPI targets, my conclusion is that the long lead time of SW development entity items in the MN L1 organization is caused by the long competence area items.

The recommendation of the needed process changes is included in this study to ensure that feature splitting and sub feature refinement in SW development is working as planned in the future according to the Nokia MN processes.