Conference paper Open Access

Joint Transmission with Dummy Symbols for Dynamic TDD in Ultra-Dense Deployments

Haris Celik; Ki Won Sung


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  <identifier identifierType="DOI">10.5281/zenodo.886558</identifier>
  <creators>
    <creator>
      <creatorName>Haris Celik</creatorName>
      <affiliation>KTH Royal Institute of Technology</affiliation>
    </creator>
    <creator>
      <creatorName>Ki Won Sung</creatorName>
      <affiliation>KTH Royal Institute of Technology</affiliation>
    </creator>
  </creators>
  <titles>
    <title>Joint Transmission with Dummy Symbols for Dynamic TDD in Ultra-Dense Deployments</title>
  </titles>
  <publisher>Zenodo</publisher>
  <publicationYear>2017</publicationYear>
  <subjects>
    <subject>Joint transmission; dummy symbols; dynamic TDD; ultra-dense network</subject>
  </subjects>
  <dates>
    <date dateType="Issued">2017-06-12</date>
  </dates>
  <resourceType resourceTypeGeneral="ConferencePaper"/>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://zenodo.org/record/886558</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsVersionOf">10.5281/zenodo.886557</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode">Creative Commons Attribution Non Commercial No Derivatives 4.0 International</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">&lt;p&gt;Dynamic time-division duplexing (TDD) is considered a promising solution to deal with fast-varying traffic often found in ultra-densely deployed networks. At the same time, it generates more interference which may degrade the performance of some user equipment (UE). When base station (BS) utilization is low, some BSs may not have an UE to serve. Rather than going into sleep mode, the idle BSs can help nearby UEs using joint transmission. To deal with BS-to-BS interference, we propose using joint transmission with dummy symbols where uplink BSs serving uplink UEs participate in the precoding. Since BSs are not aware of the uplink symbols beforehand, any symbols with zero power can be transmitted instead to null the BS-to-BS interference. Numerical results show significant performance gains for uplink and downlink at low and medium utilization. By varying the number of participating uplink BSs in the precoding, we also show that it is possible to successfully trade performance in the two directions.&lt;/p&gt;</description>
  </descriptions>
  <fundingReferences>
    <fundingReference>
      <funderName>European Commission</funderName>
      <funderIdentifier funderIdentifierType="Crossref Funder ID">10.13039/100010661</funderIdentifier>
      <awardNumber awardURI="info:eu-repo/grantAgreement/EC/H2020/671680/">671680</awardNumber>
      <awardTitle>Mobile and wireless communications Enablers for Twenty-twenty (2020) Information Society-II</awardTitle>
    </fundingReference>
  </fundingReferences>
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