Advanced coordinated beamforming for the downlink of future LTE cellular networks

George C. Alexandropoulos 1 Paul Ferrand 1 Jean-Marie Gorce 2 Constantinos B. Papadias 3
2 SOCRATE - Software and Cognitive radio for telecommunications
Inria Grenoble - Rhône-Alpes, UCBL - Université Claude Bernard Lyon 1, CITI - CITI Centre of Innovation in Telecommunications and Integration of services
Abstract : Modern cellular networks in traditional frequency bands are notoriously interference-limited especially in urban areas, where base stations are deployed in close proximity to one another. The latest releases of Long Term Evolution (LTE) incorporate features for coordinating downlink transmissions as an efficient means of managing interference. Recent field trial results and theoretical studies of the performance of joint transmission (JT) coordinated multi-point (CoMP) schemes revealed, however, that their gains are not as high as initially expected, despite the large coordination overhead. These schemes are known to be very sensitive to defects in synchronization or information exchange between coordinating bases stations as well as uncoordinated interference. In this article, we review recent advanced coordinated beamforming (CB) schemes as alternatives, requiring less overhead than JT CoMP while achieving good performance in realistic conditions. By stipulating that, in certain LTE scenarios of increasing interest, uncoordinated interference constitutes a major factor in the performance of CoMP techniques at large, we hereby assess the resilience of the state-of-the-art CB to uncoordinated interference. We also describe how these techniques can leverage the latest specifications of current cellular networks, and how they may perform when we consider standardized feedback and coordination. This allows us to identify some key roadblocks and research directions to address as LTE evolves towards the future of mobile communications.
Type de document :
Article dans une revue
IEEE Communications Magazine, Institute of Electrical and Electronics Engineers, 2016, 54 (7), pp.54 - 60. 〈10.1109/MCOM.2016.7509379〉
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https://hal.inria.fr/hal-01395615
Contributeur : Jean-Marie Gorce <>
Soumis le : vendredi 11 novembre 2016 - 10:25:50
Dernière modification le : mardi 16 janvier 2018 - 16:13:59

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George C. Alexandropoulos, Paul Ferrand, Jean-Marie Gorce, Constantinos B. Papadias. Advanced coordinated beamforming for the downlink of future LTE cellular networks. IEEE Communications Magazine, Institute of Electrical and Electronics Engineers, 2016, 54 (7), pp.54 - 60. 〈10.1109/MCOM.2016.7509379〉. 〈hal-01395615〉

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