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Cellular connectivity to low altitude unmanned aerial vehicles (UAVs) hasreceived significant interest recently which has led to a 3GPP study onenhanced LTE support for connected UAVs in Release 15. The objective of thestudy is to investigate the capability of long-term evolution (LTE) networksfor providing connectivity to UAVs. In this article, we provide an overview ofthe key findings of the 3GPP Release-15 study-item phase. We first introduceUAV connectivity requirements and performance evaluation scenarios defined inthe study. We then discuss radio channel models and the key identifiedchallenges of using LTE networks to provide connectivity to UAVs. We summarizepotential solutions to address the challenges including interference detectionand mitigation techniques, mobility enhancements, and UAV identification.Finally, we also shed light on the key features standardized during theRelease-15 work-item phase.

An Overview of 3GPP Release-15 Study on Enhanced LTE Support for Connected Drones