UNION: A Trust Model Distinguishing Intentional and Unintentional Misbehavior in Inter-UAV Communication

Table 1

Unintentional packet drop reasons.

Layer	Reasons
Physical layer	Signal attenuation/masking/fading/interference
	Signal reflection/diffraction/refraction
	Multipath
	Mobility
	Obstacles
	Bandwidth occupation
	etc.
MAC layer	Collision
	Hidden-exposed station problem
	Near-far problem
	Mobility
	Energy
	Handover
	Clustering
	etc.
Network layer	Mobility
	Queuing
	Network fragmentation/association
	ID (IP configuration)
	Time-To-Live
	Handover
	Clustering
	etc.