LTE Radio Analytics Made Easy and Accessible

Despite the rapid growth of next-generation cellular networks, researchers and end-users today have limited visibility of the performance and problems of these net- works. As LTE deployments move towards small and femto cells, even operators struggle to fully understand the propagation and interference patterns affecting their service, particularly in indoor settings. This paper introduces LTEye, the first open platform to monitor and analyze LTE radio performance at a fine temporal and spatial granularity. LTEye accesses the LTE PHY layer without requiring private user information or provider support. It provides deep insights on the PHY-layer protocols deployed in these networks. LTEye's analytics enable researchers and policy makers to un- cover serious deficiencies in these networks stemming from inefficient spectrum utilization and inter-cell interference. LTEye extends synthetic aperture radar (SAR), widely used for radar and backscatter signals, to operate over cellular signals. This enables businesses and end-users to localize mobile users and capture the distribution of LTE performance across spatial locations in their facility. As a result, they can diagnose problems and better plan deployment of repeaters or femto cells. We implement LTEye on USRP software radios, and present empirical insights and analytics from multiple base stations of two operators in our locality.