REM-Based Handover Algorithm for Next-Generation Multi-Tier Cellular Networks

Abstract : —The strongest-cell criterion has been extensively used for handover algorithms during the last cellular-network generations. When network topologies become multi-layered, it results in abrupt behaviors such as the ping-pong effect as a consequence of the power gap between tiers and their irregular deployment. This effect not only affects users' quality of experience but also introduces a significant network overhead. Therefore, we propose an original handover algorithm based on predicted incomplete channel states from a Radio Environment Map to reduce this effect. The proposed algorithm is user triggered, network assisted, and fully backward compatible with LTE-A. Moreover, we evaluate the performance of our proposed algorithm against LTE-A in a two-tier cellular network for different user speeds following the guidelines outlined by the 3GPP on diverse matters (channel, mobility, wrapping, etc.). When applying realistic timing, our results reveal a highly substantial improvement in the number of ping-pong handovers regardless of the handover policy adopted in comparison to LTE-A without sacrificing users' experience; for instance, we obtain at least an order of magnitude decrease in the ping-pong rate at the expense of losing less than 9 percent in spectral efficiency.
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Cristo Suarez-Rodriguez, B Jayawickrama, Faouzi Bader, E Dutkiewicz, Michael Heimlich. REM-Based Handover Algorithm for Next-Generation Multi-Tier Cellular Networks. IEEE Wireless Communications and Networking Conference (IEEE WCNC'2018), Apr 2018, Barcelone, Spain. ⟨10.1109/wcnc.2018.8377242⟩. ⟨hal-01705711⟩

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