Analysis and optimization of interference nulling in downlink multi-antenna HetNets with offloading

Yueping Wu, Ying Cui, Bruno Clerckx

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Heterogeneous networks (HetNets) with offloading is considered as an effective way to meet the high data rate demand of future wireless service. However, the offloaded users suffer from strong inter-tier interference, which reduces the benefits of offloading and is one of the main limiting factors of the system performance. In this paper, we investigate the use of an interference nulling (IN) beamforming scheme to improve the system performance by carefully managing the inter-tier interference to the offloaded users in downlink two-tier HetNets with multi-antenna base stations. Utilizing tools from stochastic geometry, we derive a tractable expression for the rate coverage probability of the IN scheme. Then, we optimize the design parameter, i.e., the degrees of freedom that can be used for IN, to maximize the rate coverage probability. Specifically, in the asymptotic scenario where the rate threshold is small, by studying the order behavior of the rate coverage probability, we characterize the optimal design parameter. For the general scenario, we show some properties of the optimal design parameter. Finally, by numerical simulations, we show the IN scheme can outperform both the simple offloading scheme without interference management and the almost blank subframes scheme in 3GPP LTE, especially in large antenna regime.

    Original languageEnglish
    Title of host publication2015 IEEE International Conference on Communications, ICC 2015
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Pages2457-2462
    Number of pages6
    ISBN (Electronic)9781467364324
    DOIs
    Publication statusPublished - 2015 Sept 9
    EventIEEE International Conference on Communications, ICC 2015 - London, United Kingdom
    Duration: 2015 Jun 82015 Jun 12

    Publication series

    NameIEEE International Conference on Communications
    Volume2015-September
    ISSN (Print)1550-3607

    Other

    OtherIEEE International Conference on Communications, ICC 2015
    Country/TerritoryUnited Kingdom
    CityLondon
    Period15/6/815/6/12

    Bibliographical note

    Publisher Copyright:
    © 2015 IEEE.

    ASJC Scopus subject areas

    • Computer Networks and Communications
    • Electrical and Electronic Engineering

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