Association in Dense Cell-Free mmWave Networks

Rizqi Hersyandika, Qing Wang, Sofie Pollin

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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We exploit a dense cell-free mmWave network where User Equipments (UEs) are served by multiple highly directional beams provided by multiple Base Stations (BSs) simultaneously. Such multi-beam scenarios can either offer high spectral efficiency when different information is transmitted through each beam or a diversity gain when each beam transmits the same information. However, this increased spectral efficiency or diversity gain costs a more complex network association phase. A UE requires finding multiple nearby serving BSs and determining the optimal beam pair for each one. Thus, an efficient association process is urgently needed. In this work, we propose a UE-initiated association method for dense cell-free mmWave networks. We design an efficient beam training mechanism with multiple BSs using hybrid beamforming. We evaluate the proposed association method under different network configurations. The simulation results show that compared to traditional solutions, our proposed association method can lead to maximally 100% faster beam training and reduce energy consumption by up to 77%. The proposed UE-initiated association method is also scalable to the number of RF chains and antennas at BSs and UEs, making it very suitable for dense cell-free networks.
Original languageEnglish
Title of host publicationICC 2021 - IEEE International Conference on Communications
Subtitle of host publicationProceedings
Place of PublicationPiscataway
Number of pages6
ISBN (Electronic)978-1-7281-7122-7
ISBN (Print)978-1-7281-7123-4
Publication statusPublished - 2021
EventICC 2021 - IEEE International Conference on Communications - Virtual at Montreal, Canada
Duration: 14 Jun 202123 Jun 2021


ConferenceICC 2021 - IEEE International Conference on Communications
CityVirtual at Montreal

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.


  • Cell-free network
  • millimeter-wave (mmWave)
  • association
  • beam training
  • hybrid beamforming


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