5G Multi-RAT LTE-WiFi Ultra-Dense Small Cells: Performance Dynamics, Architecture, and Trends

Olga Galinina, Alexander Pyattaev, Sergey Andreev, Mischa Dohler, Yevgeni Koucheryavy

    Research output: Contribution to journalArticleScientificpeer-review

    155 Citations (Scopus)


    The ongoing densification of small cells yields an unprecedented paradigm shift in user experience and network design. The most notable change comes from cellular rates being comparable to next-generation WiFi systems. Cellular-to-WiFi of-floading, the standard modus operandi of recent years, is therefore shifting towards a true integration of both technology families. Users in future 5G systems will thus likely be able to use 3GPP, IEEE, and other technologies simultaneously, so as to maximize their quality of experience. To advance this high-level vision, we perform a novel performance analysis specifically taking the system-level dynamics into account and thus giving a true account on the uplink performance gains of an integrated multi radio access technology (RAT) solution versus legacy approaches. Further, we advocate for an enabling architecture that embodies the tight interaction between the different RATs, as we lay out a standardization roadmap able to materialize the envisaged design. 3GPP-compliant simulations have also been carried out to corroborate the rigorous mathematical analysis and the superiority of the proposed approach.

    Original languageEnglish
    Pages (from-to)1224-1240
    Number of pages17
    JournalIEEE Journal on Selected Areas in Communications
    Issue number6
    Publication statusPublished - Jun 2015
    Publication typeA1 Journal article-refereed


    • Network densification
    • cellular offloading
    • 5G architecture
    • integrated LTE-WiFi small cells
    • system-level dynamics
    • performance analysis
    • TIER
    • DESIGN

    Publication forum classification

    • Publication forum level 3


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