Directed Handover Mechanism for Effective Doppler Reduction in LTE Cellular Telemetry
Abstract
Aeronautical mobile telemetry needs for providing communication to very high-speed test articles falls beyond the nominal operating envelope of cellular LTE systems. Laboratory experimentation on operational LTE networks demonstrates the limitations on LTE uplink and downlink separately, illustrating the limits of frequency offset compensation procedures typically encountered in commercial systems. To address the limitation, a test range telemetry cellular network is devised to provide coverage and supervised handover mechanisms that are directed by a centralized control entity designed to reduce maximum Doppler shift. The method to exercise directed handover is illustrated in this talk and the expected reduction in the apparent Doppler to a test article is demonstrated. The technique uses standard mechanisms for informing base stations of the channel conditions observed at the mobile, selection of the settings for triggering of handover events and the choice of desirable overall LTE parameters for test range applications. To make use of the base stations authorityto make handover decisions a deviation from typical LTE procedures is needed and a description of the necessary interventions within the Radio Access Network are discussed. We describe the laboratory experiment setup used to verify the performance of handovers under conditions that can be encountered in the test range. The experiments provide us with guidance on designing the LTE radio access network and applying centralized control so as to stay within acceptable performance limits. A set of rules is deduced from these experimental observations, which are used for the near real-time control of a cellular telemetry network to allow use of LTE systems for AMT applications.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 16, 2018
- Accession Number
- AD1056926
Entities
People
- Achilles Kogiantis
- Anthony Triolo
- Dan Harasty
- Herb Van Helmondt
- Jeffery Young
- Kiran Rege
- Nan Maung
- William R. Johnson