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dc.contributor.authorLiu, Chun-Hungen_US
dc.contributor.authorTsai, Hong-Chengen_US
dc.date.accessioned2018-08-21T05:54:30Z-
dc.date.available2018-08-21T05:54:30Z-
dc.date.issued2017-09-01en_US
dc.identifier.issn1536-1276en_US
dc.identifier.urihttp://dx.doi.org/10.1109/TWC.2017.2715015en_US
dc.identifier.urihttp://hdl.handle.net/11536/146048-
dc.description.abstractThis paper studies how to maximize the per-userbased throughput in an M-tier heterogeneous wireless network (HetNet) by optimally managing traffic flows among the access points (APs) in the HetNet. The APs in the first M - 1 tiers can use the licensed spectrum at the same time whereas they share the unlicensed spectrum with the APs in the Mth tier by the proposed opportunistic CSMA/CA protocol. We characterize the statistical property of the cell load and channel access probability of each AP using a general AP association scheme. For an AP in each tier, the tight bounds on its mean spectrum efficiencies in the licensed and unlicensed spectra are derived in a low-complexity form for general random channel gain and AP association weight models and they can give some insights on how channel gains, AP association weights and void AP probabilities affect the mean spectrum efficiencies. We define the per-user link throughput and per-user network throughput based on the derived the mean spectrum efficiencies and maximize them by proposing the decentralized and centralized traffic management schemes for the APs in the first M - 1 tiers under the constraint that the per-user link throughput of the tier-M APs must be above some minimum required value. Finally, a numerical example of coexisting LTE and Wi-Fi networks is provided to validate our derived results and findings.en_US
dc.language.isoen_USen_US
dc.subjectTraffic offloadingen_US
dc.subjectcoverageen_US
dc.subjectthroughputen_US
dc.subjectunlicensed spectrumen_US
dc.subjectheterogeneous networken_US
dc.subjectstochastic geometryen_US
dc.titleTraffic Management for Heterogeneous Networks With Opportunistic Unlicensed Spectrum Sharingen_US
dc.typeArticleen_US
dc.identifier.doi10.1109/TWC.2017.2715015en_US
dc.identifier.journalIEEE TRANSACTIONS ON WIRELESS COMMUNICATIONSen_US
dc.citation.volume16en_US
dc.citation.spage5717en_US
dc.citation.epage5731en_US
dc.contributor.department電信工程研究所zh_TW
dc.contributor.departmentInstitute of Communications Engineeringen_US
dc.identifier.wosnumberWOS:000409982900011en_US
Appears in Collections:Articles