A survey on Cellular-connected uavs: Design Challenges, Enabling 5G/B5g innovations, and Experimental Advancements



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6.3. Summary of Lessons Learnt
The important lessons learnt from this section are listed
as follows:
• The solutions proposed to the technical synergistic
challenges of 5G/B5G systems with UAV technology
must be validated and tested for correctness. Hence,
the key design considerations of cellular-connected
UAV necessitate sound measurement campaigns, field
trials, simulations and working prototypes to study the
behaviour with real-world scenarios. The experimen-
tal testbeds and field measurements have significant
practical relevance, because these are very conducive
for realistic evaluation of the system under study.
D. Mishra et al.:
Preprint submitted to Elsevier
Page 23 of 30


A Survey on Cellular-connected UAVs: Design Challenges, Enabling 5G/B5G Innovations, and Experimental Advancements
Table 9
Comparison of existing works on field trials and measurement campaigns
Reference Work Cellular Network
Trial Environment
Performance Metric
[
94
]
4G LTE
Suburban
RSRP, RSRQ, SINR, downlink latency, resource utilization
[
95
]
5G New Radio
Rural
RSRP, SNR, Throughput, 5G connectivity
[
96
]
4G LTE
Mixed Suburban
Cellular connectivity for low altitude UAVs
[
97
]
4G LTE
Rural
RSRP, RSRQ, SINR, Effect of altitude on UAV
[
86
]
4G LTE
Rural, Suburban, and Urban Throughput degradation, Interference, Uplink signal power
[
98
]
4G LTE-A
Unknown
RSRP, RSRQ, SINR, PCI, UL/DL throughput, EARFCN
[
99
]
4G LTE
Rural
Cellular-connected UAV identification
[
100
]
4G LTE
Urban
Channel propagation models
[
101
]
4G LTE
Rural
RSSI, RSRP, RSRQ, uplink/downlink throughput
• Most of the existing literature relies on software sim-
ulations to evaluate the technical aspects of proposed
solutions. Few works have shown to conduct field
measurement campaigns to observe and study the be-
haviour of cellular-connected UAV such as handovers,
cell association, signal strength reduction, radio link
status, interference mitigation etc. Very few works fo-
cus on design and development of real-world working
prototypes of cellular-connected UAV, because such
efforts are time-taking and highly complex. Prototyp-
ing works are still in its infancy stage and hence, call
for more contributions in this regard.

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