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    Threshold power based UE admittance and contention free resource allocation for interference mitigation in cognitive femtocells

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    Authors
    Safdar, Ghazanfar Ali
    Tariq, Faisal
    Kpojime, Harold Orduen
    Affiliation
    University of Bedfordshire
    Queen Mary University of London
    Issue Date
    2017-11-17
    Subjects
    femtocells
    power control
    spectrum allocation
    scheduling
    G420 Networks and Communications
    
    Metadata
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    Abstract
    Femtocells are aimed at providing strong coverage in the indoor area where typical macrocell coverage is very poor. It has hugely attracted network operators and stakeholders mainly due to its simple plug and play operation and low cost. Femtocells operate on a much lower power compared to macrocell and thus provide a number of benefits including energy efficiency and frequent spatial reuse of the spectrum. Femtocells are overlaid on macrocells and designed to co-exist with them sharing the same spectrum pool. However, since they are deployed by the end user, no pre-deployment resource planning is possible. So, interference among the femtocells as well as between femtocells and macrocells remain a major bottleneck for successful operation of femtocell networks. This paper proposes a novel threshold power based admittance and contention free resource allocation for interference mitigation in cognitive femtocell networks. In our proposed scheme, a Femtocell Access Point with Cognitive radio capability known as Cognitive Femtocells (CF), sets a threshold value on the mutual interference between itself and a close by macrocell user equipment (MUE). To mitigate cross-tier interference, a CF classifies MUEs with higher than threshold interference value as Undesirable MUEs (UMUEs) and subsequently admits it as one of its user equipment. MUEs with lower than threshold interference values are classified as Desirable MUEs (DMUEs). To mitigate co-tier interference, proposed scheme introduces a scheduling engine which employs matching policy attributes and assigns resource blocks (RBs) of unique DMUEs to CFs to avoid any possible contention problems, thus providing improved co-tier interference. System level simulations have been performed to demonstrate effectiveness of scheme and significant performance improvement in terms of SINR, throughput and spectrum efficiency.
    Citation
    Safdar GA, Tariq F, Kpojime HO (2017) 'Threshold power based UE admittance and contention free resource allocation for interference mitigation in cognitive femtocells', Wireless Personal Communications, 95 (2), pp.1601-1616.
    Publisher
    Springer
    Journal
    Wireless Personal Communications
    URI
    http://hdl.handle.net/10547/623048
    DOI
    10.1007/s11277-016-3870-z
    Additional Links
    https://link.springer.com/article/10.1007/s11277-016-3870-z
    Type
    Article
    Language
    en
    ISSN
    0929-6212
    ae974a485f413a2113503eed53cd6c53
    10.1007/s11277-016-3870-z
    Scopus Count
    Collections
    Computing

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