Читать книгу Unmanned Aerial Vehicles for Internet of Things (IoT) - Группа авторов - Страница 41

Cellular-tech. like emerging 5G technology & LTE are likely to be a candidate for UAS development. It ensures [25]:

Table 1.2 Frequency bands.

Region 1	Region 2	Region 3
12.5–12.75 GHz for space to Earth	10.95–11.2 GHz for space to Earth	12.2–12.75 GHz for space to Earth
14.0–14.47 GHz for Earth to space	11.45–11.7 GHz for space to Earth	14.0–14.47 GHz for Earth to space
19.7–20.2 GHz for space to Earth	11.7–12.2 GHz for space to Earth	19.7–20.2 GHz for space to Earth
29.5–30.0 GHz for Earth to space	14.0–14.47 GHz for Earth to space	29.5–30.0 GHz for Earth to space
	19.7–20.2 GHz for space to Earth
	29.5–30.0 GHz for Earth to space

 - High mobility

 - Increased reliability & quality of services

 - Ubiquitous coverage

 - Robust security Radio Division.

Numerous telecom companies are conducting trials for UAS operation in cellular LTE network and consequently, the problems faced are [26]:

 - Optimization of the cellular requirement for drones: Cellular networks are needed to be distinguished from the one which is currently in use by worldwide users for optimal operation (e.g. Noise avoidance) of UAs in cellular networks.

 - Handover optimization: While in operation it is obvious UAs are going to receive signals from multiple base stations. Therefore, handover will be frequent which will lead to heavy signaling overheads.

 - Interference mitigation: When airborne UA will receive signals from multiple base stations hence there will be interference.