Tractable Resource Management With Uplink Decoupled Millimeter-Wave Overlay in Ultra-Dense Cellular Networks
2016 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 15, no 6, 4362-4379 p.Article in journal (Refereed) PublishedText
The forthcoming 5G cellular network is expected to overlay millimeter-wave (mmW) transmissions with the incumbent micro-wave (mu W) architecture. The overall mm-mu Wresource management should, therefore, harmonize with each other. This paper aims at maximizing the overall downlink (DL) rate with a minimum uplink (UL) rate constraint, and concludes: mmWtends to focus more on DL transmissions while mu W has high priority for complementing UL, under time-division duplex (TDD) mmW operations. Such UL dedication of mu W results from the limited use of mmW UL bandwidth due to excessive power consumption and/or high peak-to-average power ratio (PAPR) at mobile users. To further relieve this UL bottleneck, we propose mmW UL decoupling that allows each legacy mu Wbase station (BS) to receive mmW signals. Its impact on mm-mu W resource management is provided in a tractable way by virtue of a novel closed-form mm-mu W spectral efficiency (SE) derivation. In an ultra-dense cellular network (UDN), our derivation verifies mmW (or mu W) SE is a logarithmic function of BS-to-user density ratio. This strikingly simple yet practically valid analysis is enabled by exploiting stochastic geometry in conjunction with real three-dimensional (3-D) building blockage statistics in Seoul, South Korea.
Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2016. Vol. 15, no 6, 4362-4379 p.
Ultra-dense cellular networks, millimeter-wave, heterogeneous cellular networks, radio resource management, time-division duplex, uplink decoupling, stochastic geometry, 3D blockage model
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-189941DOI: 10.1109/TWC.2016.2540626ISI: 000378506600043ScopusID: 2-s2.0-84976312644OAI: oai:DiVA.org:kth-189941DiVA: diva2:950180
QC 201607282016-07-282016-07-252016-07-28Bibliographically approved