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A Random Access Protocol for Pilot Allocation in Crowded Massive MIMO Systems
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.
Aalborg University, Denmark.
Aalborg University, Denmark.
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-7599-4367
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2017 (English)In: IEEE Transactions on Wireless Communications, ISSN 1536-1276, E-ISSN 1558-2248, Vol. 16, no 4, 2220-2234 p.Article in journal (Refereed) Published
Abstract [en]

The massive multiple-input multiple-output (MIMO) technology has great potential to manage the rapid growth of wireless data traffic. Massive MIMO achieves tremendous spectral efficiency by spatial multiplexing many tens of user equipments (UEs). These gains are only achieved in practice if many more UEs can connect efficiently to the network than today. As the number of UEs increases, while each UE intermittently accesses the network, the random access functionality becomes essential to share the limited number of pilots among the UEs. In this paper, we revisit the random access problem in the Massive MIMO context and develop a reengineered protocol, termed strongest-user collision resolution (SUCRe). An accessing UE asks for a dedicated pilot by sending an uncoordinated random access pilot, with a risk that other UEs send the same pilot. The favorable propagation of massive MIMO channels is utilized to enable distributed collision detection at each UE, thereby determining the strength of the contenders signals and deciding to repeat the pilot if the UE judges that its signal at the receiver is the strongest. The SUCRe protocol resolves the vast majority of all pilot collisions in crowded urban scenarios and continues to admit UEs efficiently in overloaded networks.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC , 2017. Vol. 16, no 4, 2220-2234 p.
Keyword [en]
Massive MIMO; random access; collision resolution
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:liu:diva-137397DOI: 10.1109/TWC.2017.2660489ISI: 000399395100014OAI: oai:DiVA.org:liu-137397DiVA: diva2:1096670
Note

Funding Agencies|Danish Council for Independent Research [DFF133500273]; Horizon project FANTASTIC-5G [ICT-671660]; EU FP7 Project MAMMOET [ICT-619086]; ELLIIT; CENIIT

Available from: 2017-05-18 Created: 2017-05-18 Last updated: 2017-05-18

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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
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More styles
Language
  • de-DE
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More languages
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