Towards a space based infrastructure for 5G and beyond 5G networks

A 5G and beyond 5G space-based infrastructure comprising space, ground, user and network segment is investigated based on a previous use-case assessment and technical feasibility. Using an iterative approach, we first identify a low-earth orbit and the frequency bands S and Ka as the most promising candidates for a mid-term scenario. In a second step, the mid-term architecture is further detailed with assumptions made for a regenerative payload processing, user and feeder links as well as inter-satellite links leading to an estimation of a medium satellite size with ~2.6kW power. The payload is supporting 16 beams and 2 feeder links and we estimate a total sellable capacity of 1.9 Tbit/s with 180 satellites providing continuous global coverage. This capacity can be shared among the different identified mid-term use-cases. For the long-term and for supporting additional use-cases as well as higher data rates, lower satellite orbits and higher frequency bands such as Q- and V-Band need to be adopted.

I. Introduction

This paper describes the results of a study to assess the dependencies between different aspects of architecture design and the evaluation criteria incl. key performance indicators (KPIs). In order to identify potential system architecture, we evaluate the following aspects: (i) frequency bands for operation, (ii) space architecture, (iii) 5G air interfaces and waveforms, (iv) user terminal design, and (v) network segment. The assessment of use cases and business-related aspects result in the mission, user, service and system requirements for the discussion of the above listed system aspects. KPIs and evaluation criteria for assessment of the overall system are deduced from use case specific requirements. Additional evaluation criteria, are included in order to account for satcom specific characteristics.