Cell-free massive multiple-input multiple-output systems are expected to provide faster and more robust connections to user equipments (UEs) by cooperation of a massive number of distributed access points (APs). Energy efficiency (EE) is becoming an important indicator to design and operate networks; to improve EE, use of sleep-mode of APs (SMA), also called AP switch on/off, for selected APs has been investigated. Although previous works analyze the performance of SMA in the presence of user-centric clustering (UCC), these two techniques are assumed to not affect each other. In this paper, we propose a new greedy combining algorithm (GCA), where SMA and UCC work alternately to obtain better performance, and show its superiority over a conventional algorithm. Example simulations show that GCA can achieve 44% higher total EE for 8 UEs and 59% for 16 UEs with 64 APs. Additionally, GCA also provides higher minimum spectral efficiency thanks to its structure of the algorithm.


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    Titel :

    Joint AP On/Off and User-Centric Clustering for Energy-Efficient Cell-Free Massive MIMO Systems


    Beteiligte:
    Ito, Masaaki (Autor:in) / Kanno, Issei (Autor:in) / Amano, Yoshiaki (Autor:in) / Kishi, Yoji (Autor:in) / Chen, Wei-Yu (Autor:in) / Choi, Thomas (Autor:in) / Molisch, Andreas F. (Autor:in)


    Erscheinungsdatum :

    2022-09-01


    Format / Umfang :

    865740 byte





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch