Asymmetry balancing in OFDMA-TDD cellular networks

Ellina Foutekova, Sinan Sinanovic, Harald Haas

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


    The purpose of this paper is to compare two interference avoidance techniques for time division duplex (TDD) wireless networks, viz.: a novel technique termed asymmetry balancing and the known zone division (ZD) principle. Both asymmetry balancing and ZD strive to reduce the same-entity interference (mobile station (MS)-to-MS and base station (BS)-to-BS) that occurs during crossed slots, i.e. slots which are simultaneously used for uplink (UL) in one cell and for downlink (DL) in a neighbouring cell. Asymmetry balancing eliminates crossed slots by synchronising the TDD switching point (SP) among cells. Cell-specific asymmetry demands are still maintained through cooperation among the entities in the network. ZD, on the other hand, reduces same-entity interference by decreasing transmission range. This study demonstrates that asymmetry balancing achieves more than 100% higher spectral efficiencies than ZD for the considered scenarios.
    Original languageEnglish
    Title of host publicationIEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2008)
    Number of pages5
    ISBN (Print)9781424426430
    Publication statusPublished - 2008


    • wireless networks
    • asymmetry balancing
    • cellular networks


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