TABLE II. Comparative Analysis of the Proposed Scheme With Existing State-of-the-Art.

Author	Year	Objective	1	2	3	4	Pros	Cons
Gupta et al. [14]	2020	BC based medical supply scheme with priority queue to expedite delivery to critical patients	Y	N	Y	N	A criticality score assessment is proposed and smart contracts are embedded between healthcare stakeholders	Does not discuss the security issues in UAV communication
Das et al. [15]	2021	Proposes a BC, AI and IoMT enabled vaccine distribution scheme for COVID-19 disease in Internet-of-Medical-Things environment	N	N	Y	N	Utilizes BC for storing health assets of patients at cloud end through threat models and AI based analytic	Does not discusses computation offloading through edge based communication network
Zuhair et al. [16]	2021	Proposes a UAV-enabled, 6G-assisted contact tracing scheme for COVID-19 patient	Y	Y	Y	N	Explores usage of UAV for identifying potentially affected COVID-19 patients and storing their records on BC at the backdrop of 6G communication network	Does not explain the edge offloading phenomena for UAVs with high dynamics
Cheema et al. [17]	2022	Explores UAV based secured delivery of medical aids using BC	Y	N	Y	N	Proposes a BC based scheme for registering delivery agents and utilizes machine learning-based intrusion detection system for securing UAVs during in-flight operations	Does not explores communication network between UAVs and ground entities
Masuduzzaman et al. [18]	2022	Proposes an automated real-time surveillance scheme using UAV	Y	N	N	Y	Utilizes deep learning-based vehicle detection & two factor authentication for faster and secured verification	Does not discuss radio communication network between UAVs and server
Rani et al. [19]	2022	Discusses societal applications of UAV for secured and authentic delivery	Y	N	N	N	Discusses technologies like voice based authentication, GPS navigation tracking and visual detection	Does not discuss the end-to-end communication requirement with server and adversary attacks
Johannessen et al. [20]	2022	Discusses the assessment of time and cost saving for sample transport using UAVs	Y	N	N	N	Provides an analytical study on time savings of drone transport compared to ground, differing distance & route frequency, and elements to assess the UAV transportation cost	The proposed approach does not dictate assessments in heavy traffic and battery limitations of UAVs
Sham et al. [21]	2022	Examines the attitude of rural health care workers towards drone delivery	Y	N	N	N	Classifies the attitude of participants or healthcare workers based on different classes	Explores theoretical calculations based on limited factors.
Proposed	2022	Proposes a generic scheme to integrate UAV, 6G, and BC for secured vaccine distribution	Y	Y	Y	Y	Utilizes SC and 6G-enabled edge offloading technologies for handling high end UAV computations, provides very low latency compared to 5G counterpart	–

1-UAV, 2-6G, 3-BC, 4-Edge Offloading, Y-shows parameter is considered, N-shows parameter is not considered.