Dynamic TDD in LTE small cells

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Kerttula, Jussi
dc.contributor.author Marttinen, Aleksi
dc.contributor.author Ruttik, Kalle
dc.contributor.author Jäntti, Riku
dc.contributor.author Nazrul Alam, Mirza
dc.date.accessioned 2016-10-13T06:17:29Z
dc.date.issued 2016-12-01
dc.identifier.citation Kerttula , J , Marttinen , A , Ruttik , K , Jäntti , R & Nazrul Alam , M 2016 , ' Dynamic TDD in LTE small cells ' EURASIP Journal on Wireless Communications and Networking , vol 2016 , no. 1 . DOI: 10.1186/s13638-016-0696-z en
dc.identifier.issn 1687-1472
dc.identifier.issn 1687-1499
dc.identifier.other PURE UUID: f20abec3-a937-4316-ab92-e2ee9e42a1ef
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/dynamic-tdd-in-lte-small-cells(f20abec3-a937-4316-ab92-e2ee9e42a1ef).html
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/7093416/art_3A10.1186_2Fs13638_016_0696_z.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/22969
dc.description.abstract Dynamic time-division duplexing (TDD) enables adjustments of uplink (UL) and downlink (DL) resources flexibly according to the instantaneous traffic load. Long-Term Evolution (LTE) systems can be implemented in TDD mode (TD-LTE). However, the dynamic change of a TDD configuration has not been well supported and investigated. In large macro cells, the high transmit power of base stations (BSs) easily blocks the weaker user equipment’s (UE) UL signal (called the UL-DL interference); and therefore, neighboring cells usually operate with the same TDD configuration. In small cells, such as femtocells, the BS and UE transmission powers are in the same order and the system can afford to have overlapping UL-DL subframes. In addition, when DL load is light, the BS transmits empty DL subframes with only a reference signal (RS). In this paper, we measured the interference caused by DL RS. This interference is not negligible; and therefore, it is beneficial to reduce the amount of DL subframes by switching lightly loadedBSs to UL-heavy subframe configuration. We illustrate with simulations that this can improve system efficiency. Changing the subframe configuration dynamically has a switching-related cost. Frequent switching between subframe configurations can actually decrease throughput. We describe conditions where configuration change is beneficial. We also propose an algorithm that decreases the switching overhead and improves the ability to adapt to varying loads. en
dc.format.extent 10
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries EURASIP Journal on Wireless Communications and Networking en
dc.relation.ispartofseries Volume 2016, issue 1 en
dc.rights openAccess en
dc.subject.other Signal Processing en
dc.subject.other Computer Science Applications en
dc.subject.other Computer Networks and Communications en
dc.subject.other 213 Electronic, automation and communications engineering, electronics en
dc.subject.other 113 Computer and information sciences en
dc.subject.other 111 Mathematics en
dc.title Dynamic TDD in LTE small cells en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Communications and Networking
dc.subject.keyword Signal Processing
dc.subject.keyword Computer Science Applications
dc.subject.keyword Computer Networks and Communications
dc.subject.keyword 213 Electronic, automation and communications engineering, electronics
dc.subject.keyword 113 Computer and information sciences
dc.subject.keyword 111 Mathematics
dc.identifier.urn URN:NBN:fi:aalto-201610135069
dc.identifier.doi 10.1186/s13638-016-0696-z
dc.type.version publishedVersion


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