Inter-Slice Mobility Management in 5G: Motivations, Standard Principles, Challenges, and Research Directions

Mobility management in a sliced 5G network introduces new and complex challenges. In network-sliced environment, user mobility has to be managed among not only different base stations or access technologies but also slices. Managing slices, inter-slice mobility, motivates the need for solutions. This article, presented as tutorial, focuses on problem of from perspective 3GPP standards 5G. It provides detailed overview relevant standard principles. Accordingly, key technical gaps, challenges, corresponding research directions are identified toward achieving seamless within current slicing framework.