  Drones are begin used for various purposes such as border security,
surveillance, cargo delivery, visual shows and it is not possible to overcome
such intensive tasks with a single drone. In order to expedite performing such
tasks, drone swarms are employed. The number of drones in a swarm can be high
depending on the assigned duty. The current solution to authenticate a single
drone using a 5G new radio (NR) network requires the execution of two steps.
The first step covers the authentication between a drone and the 5G core
network, and the second step is the authentication between the drone and the
drone control station. It is not feasible to authenticate each drone in a swarm
with the current solution without causing a significant latency.
  Authentication keys between a base station (BS) and a user equipment (UE)
must be shared with the new BS while performing handover. The drone swarms are
heavily mobile and require several handovers from BS to a new BS. Sharing
authentication keys for each drone as explained in 5G NR is not scalable for
the drone swarms. Also, the drones can be used as a UE or a radio access node
on board unmanned aerial vehicle (UxNB). A UxNB may provide service to a drone
swarm in a rural area or emergency. The number of handovers may increase and
the process of sharing authentication keys between UxNB to new UxNB may be
vulnerable to eavesdropping due to the wireless connectivity.
  In this work, we present a method where the time and the number of the
communication for the authentication of a new drone joining the swarm are less
than 5G NR. In addition, group-based handover solutions for the scenarios in
which the base stations are terrestrial or mobile are proposed to overcome the
scalability and latency issues in the 5G NR.
