An Efficient Fronthaul Scheme Based on Coaxial Cables for 5G Centralized Radio Access Networks

The 5G mobile communication systems introduce multiples functional splits between base station elements, new transmission bands and a large number of antennas supporting beamforming. In this scenario, a viable strategy to avoid building penetration losses is to deploy the antenna elements indoor and...

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Published inIEEE transactions on communications Vol. 69; no. 2; pp. 1343 - 1357
Main Authors Acatauassu, Diogo, Lica, Moyses, Ohashi, Aline, Fernandes, Andre Lucas Pinho, Freitas, Marx, Costa, Joao C. W. A., Medeiros, Eduardo, Almeida, Igor, Cavalcante, Andre Mendes
Format Journal Article
LanguageEnglish
Published New York IEEE 01.02.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
5G mobile communication
Antennas
Beamforming
C-RAN
Coaxial cables
Communication cables
fronthaul
Mobile antennas
Network latency
Physical layer
Radio access networks
Radio equipment
radio-over-coaxial
small cells
Transmitting antennas
Urban areas
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Abstract The 5G mobile communication systems introduce multiples functional splits between base station elements, new transmission bands and a large number of antennas supporting beamforming. In this scenario, a viable strategy to avoid building penetration losses is to deploy the antenna elements indoor and use a fronthaul link to establish the connection between them and the rest of the radio access network. This work explores a 5G fronthaul scheme based on analog radio over coaxial cables, leveraging this existing fixed access infrastructure to facilitate 5G deployments. Results indicate that the fronthaul solution discussed here is able to support the high capacity requirement of 5G, with the additional benefits of low transmit power, low latency and low cost. The main novelty of this paper is to investigate the potential of this kind of fronthaul architecture considering both the physical layer and economic aspects.
AbstractList The 5G mobile communication systems introduce multiples functional splits between base station elements, new transmission bands and a large number of antennas supporting beamforming. In this scenario, a viable strategy to avoid building penetration losses is to deploy the antenna elements indoor and use a fronthaul link to establish the connection between them and the rest of the radio access network. This work explores a 5G fronthaul scheme based on analog radio over coaxial cables, leveraging this existing fixed access infrastructure to facilitate 5G deployments. Results indicate that the fronthaul solution discussed here is able to support the high capacity requirement of 5G, with the additional benefits of low transmit power, low latency and low cost. The main novelty of this paper is to investigate the potential of this kind of fronthaul architecture considering both the physical layer and economic aspects.
Author Freitas, Marx
Almeida, Igor
Cavalcante, Andre Mendes
Ohashi, Aline
Fernandes, Andre Lucas Pinho
Costa, Joao C. W. A.
Medeiros, Eduardo
Acatauassu, Diogo
Lica, Moyses
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  organization: Ericsson Research, Ericsson Telecomunicações S.A. (Ericsson Brasil), Indaiatuba 13337-300, Brazil
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Cites_doi 10.1109/ISWCS.2019.8877154
10.1109/LWC.2018.2855140
10.1109/COMST.2016.2532458
10.1109/ICC.2015.7248458
10.1109/WCNC.2018.8376975
10.1109/GLOCOMW.2010.5700416
10.1016/j.osn.2015.01.001
10.1109/PIMRC.2015.7343506
10.1364/OFC.2018.M4C.2
10.5753/sbrc.2019.7371
10.1109/WCNC.2017.7925638
10.1109/COMST.2018.2868805
10.1109/GLOCOM.2017.8254974
10.1109/TCSII.2020.2983794
10.1109/JSAC.2017.2710582
10.1109/59.867155
10.1109/ACCESS.2016.2556011
10.1109/GLOCOMW.2010.5700181
10.1109/NANA.2018.8648729
10.1109/LCOMM.2016.2562100
10.1364/JOCN.11.000600
10.1109/MCOM.2010.5402664
10.1109/PIMRC.2004.1368848
10.1109/ICASSP.2019.8682722
10.1109/CSCN.2015.7390439
10.1109/CAMAD.2018.8514967
10.1109/MCOM.2013.6515063
10.1002/bltj.10053
10.1109/PIMRC.2010.5671957
10.1109/JSAC.2018.2874144
10.1109/MCOM.2019.1800850
10.1109/ICC.2017.7996428
10.1109/PIMRC.2017.8292173
10.1109/EuCNC.2017.7980784
10.1109/TBC.2017.2786032
10.1109/COMST.2014.2355255
10.1109/ICC.2016.7511479
10.1109/TWC.2019.2908369
10.1109/WCNCW.2012.6215477
10.1109/JSAC.2014.2328098
10.1109/JLT.2010.2045103
10.1109/JLT.2013.2274193
10.1109/COMST.2017.2773462
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References ref58
ref14
ref53
ref52
(ref61) 2004
ref55
ref11
ref54
ref10
johnson (ref47) 2003
ref17
ref19
ref18
(ref13) 2018
cloonan (ref16) 2015
ref50
casier (ref51) 2009
cloonan (ref49) 2016
lu (ref22) 2014; 91
ref46
ref45
ref42
zaidi (ref4) 2017; 94
ref41
ref44
ref43
(ref48) 2017
(ref1) 2019
(ref59) 0
cable (ref57) 0
matera (ref28) 2018
ref8
ref7
ref9
ref6
ref5
ref40
ref35
ref34
ref37
ref36
ref31
ref30
ref33
ref32
ref2
ref39
ref38
ref24
ref23
ref26
ref25
ref20
(ref15) 2016
ref21
ref27
afonso (ref60) 2013
ref29
(ref56) 0
(ref3) 2018
(ref12) 2017
References_xml – ident: ref36
  doi: 10.1109/ISWCS.2019.8877154
– ident: ref33
  doi: 10.1109/LWC.2018.2855140
– ident: ref2
  doi: 10.1109/COMST.2016.2532458
– ident: ref23
  doi: 10.1109/ICC.2015.7248458
– ident: ref44
  doi: 10.1109/WCNC.2018.8376975
– year: 0
  ident: ref57
  publication-title: Primus Cable Home Page
  contributor:
    fullname: cable
– ident: ref18
  doi: 10.1109/GLOCOMW.2010.5700416
– ident: ref52
  doi: 10.1016/j.osn.2015.01.001
– year: 2016
  ident: ref49
  article-title: Using DOCSIS to meet the larger bandwidth demand of the 2020 decade and beyond
  publication-title: Proc SCTE Spring Tech Forum Soc Cable Telecommun Eng
  contributor:
    fullname: cloonan
– year: 2003
  ident: ref47
  publication-title: High-Speed Signal Propagation Advanced Black Magic
  contributor:
    fullname: johnson
– ident: ref24
  doi: 10.1109/PIMRC.2015.7343506
– ident: ref45
  doi: 10.1364/OFC.2018.M4C.2
– year: 2015
  ident: ref16
  article-title: 'Lessons from telco & wireless providers: Extending the life of the HFC plant with new technologies
  publication-title: Proc SCTE Spring Tech Forum Soc Cable Telecommun Eng
  contributor:
    fullname: cloonan
– ident: ref54
  doi: 10.5753/sbrc.2019.7371
– ident: ref27
  doi: 10.1109/WCNC.2017.7925638
– year: 0
  ident: ref56
  publication-title: Digi-Key Home Page
– year: 2018
  ident: ref28
  article-title: Analog MIMO radio-over-copper: Prototype and preliminary experimental results
  publication-title: arXiv 1809 05363
  contributor:
    fullname: matera
– ident: ref6
  doi: 10.1109/COMST.2018.2868805
– year: 2019
  ident: ref1
  publication-title: Cisco visual networking index Forecast and trends 2017-2022
– year: 2018
  ident: ref13
  publication-title: International Broadband Scorecard Includes EU5 and EU28 Broadband Scorecard
– ident: ref42
  doi: 10.1109/GLOCOM.2017.8254974
– ident: ref37
  doi: 10.1109/TCSII.2020.2983794
– year: 2018
  ident: ref3
  publication-title: Study on New Radio (NR) Access Technology
– ident: ref38
  doi: 10.1109/JSAC.2017.2710582
– ident: ref53
  doi: 10.1109/59.867155
– ident: ref7
  doi: 10.1109/ACCESS.2016.2556011
– volume: 94
  start-page: 1
  year: 2017
  ident: ref4
  article-title: 5G new radio: Designing for the future
  publication-title: Ericsson Review Technology
  contributor:
    fullname: zaidi
– ident: ref19
  doi: 10.1109/GLOCOMW.2010.5700181
– ident: ref32
  doi: 10.1109/NANA.2018.8648729
– volume: 91
  start-page: 38
  year: 2014
  ident: ref22
  article-title: Connecting the Dots: Small cells shape up for high-performance indoor radio
  publication-title: Ericsson Rev
  contributor:
    fullname: lu
– ident: ref25
  doi: 10.1109/LCOMM.2016.2562100
– ident: ref10
  doi: 10.1364/JOCN.11.000600
– year: 2016
  ident: ref15
  publication-title: LTE Evolved Universal Terrestrial Radio Access (E-UTRA) Base Station (BS) Radio Transmission and Reception
– ident: ref58
  doi: 10.1109/MCOM.2010.5402664
– ident: ref39
  doi: 10.1109/PIMRC.2004.1368848
– ident: ref35
  doi: 10.1109/ICASSP.2019.8682722
– year: 2017
  ident: ref12
  publication-title: Study on Scenarios and Requirements for Next Generation Access Technologies
– ident: ref50
  doi: 10.1109/CSCN.2015.7390439
– ident: ref14
  doi: 10.1109/CAMAD.2018.8514967
– ident: ref21
  doi: 10.1109/MCOM.2013.6515063
– year: 2004
  ident: ref61
  article-title: Fiber access network: A cable operator's perspective
  publication-title: Proc ITU-T Workshop All Star Netw Access
– ident: ref55
  doi: 10.1002/bltj.10053
– ident: ref17
  doi: 10.1109/PIMRC.2010.5671957
– ident: ref31
  doi: 10.1109/JSAC.2018.2874144
– ident: ref46
  doi: 10.1109/MCOM.2019.1800850
– ident: ref29
  doi: 10.1109/ICC.2017.7996428
– year: 0
  ident: ref59
  publication-title: Universal Small Cell 800 Series
– ident: ref43
  doi: 10.1109/PIMRC.2017.8292173
– ident: ref30
  doi: 10.1109/EuCNC.2017.7980784
– ident: ref40
  doi: 10.1109/TBC.2017.2786032
– ident: ref5
  doi: 10.1109/COMST.2014.2355255
– ident: ref26
  doi: 10.1109/ICC.2016.7511479
– year: 2009
  ident: ref51
  article-title: Techno-economic evaluation of a next generation access network deployment in a competitive setting
  contributor:
    fullname: casier
– ident: ref34
  doi: 10.1109/TWC.2019.2908369
– ident: ref20
  doi: 10.1109/WCNCW.2012.6215477
– ident: ref11
  doi: 10.1109/JSAC.2014.2328098
– year: 2013
  ident: ref60
  article-title: Techno-economic analysis of access network: Decision tools
  contributor:
    fullname: afonso
– ident: ref8
  doi: 10.1109/JLT.2010.2045103
– ident: ref9
  doi: 10.1109/JLT.2013.2274193
– year: 2017
  ident: ref48
  publication-title: TR-285 Broadband Copper Cable Models
– ident: ref41
  doi: 10.1109/COMST.2017.2773462
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Snippet The 5G mobile communication systems introduce multiples functional splits between base station elements, new transmission bands and a large number of antennas...
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StartPage 1343
SubjectTerms 5G mobile communication
Antennas
Beamforming
C-RAN
Coaxial cables
Communication cables
fronthaul
Mobile antennas
Network latency
Physical layer
Radio access networks
Radio equipment
radio-over-coaxial
small cells
Transmitting antennas
Urban areas
Title An Efficient Fronthaul Scheme Based on Coaxial Cables for 5G Centralized Radio Access Networks
URI https://ieeexplore.ieee.org/document/9269373
https://www.proquest.com/docview/2490802094
Volume 69
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