Multi-cell Reception for Uplink Grant-Free Ultra-Reliable Low-Latency Communications

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The fifth-generation (5G) radio networks will support ultra-reliable low-latency communications (URLLC). In the uplink, the latency can be reduced by removing the time-consuming and error-prone scheduling procedure and, instead, using the grant-free (GF) transmissions. Reaching the strict URLLC reliability requirements with GF transmissions is, however, particularly challenging due to the wireless channel uncertainties and interference from other URLLC devices. As a consequence, the supported URLLC capacity and, hence, the spectral efficiency are typically low. Multi-cell reception, i.e., joint reception and combining by multiple base-stations (BS), is a technique known from long-term evolution (LTE), with the potential to greatly enhance the reliability. This paper proposes the use of multi-cell reception to increase the URLLC spectral efficiency while satisfying the strict requirements using GF transmissions in a 5G new radio (NR) scenario. We evaluate the achievable URLLC capacity for an elaborate multi-cell reception parameter space and multi-cell combining techniques. In addition, we demonstrate that rethinking of the radio resource management (RRM) in the presence of multi-cell reception is needed to unleash the full potential of multi-cell reception in the context of UL GF URLLC. It is observed that multi-cell reception, compared to a single-cell reception, can provide URLLC capacity gains from 205% to 440% when the BSs are equipped with two receive antennas and 53% to 22% when BSs are equipped with four receive antennas, depending on whether the retransmissions are enabled.

OriginalsprogEngelsk
Artikelnummer8737674
TidsskriftIEEE Access
Vol/bind7
Sider (fra-til)80208-80218
Antal sider11
ISSN2169-3536
DOI
StatusUdgivet - jul. 2019

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Communication
Antennas
Long Term Evolution (LTE)
Base stations
Scheduling

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    title = "Multi-cell Reception for Uplink Grant-Free Ultra-Reliable Low-Latency Communications",
    abstract = "The fifth-generation (5G) radio networks will support ultra-reliable low-latency communications (URLLC). In the uplink, the latency can be reduced by removing the time-consuming and error-prone scheduling procedure and, instead, using the grant-free (GF) transmissions. Reaching the strict URLLC reliability requirements with GF transmissions is, however, particularly challenging due to the wireless channel uncertainties and interference from other URLLC devices. As a consequence, the supported URLLC capacity and, hence, the spectral efficiency are typically low. Multi-cell reception, i.e., joint reception and combining by multiple base-stations (BS), is a technique known from long-term evolution (LTE), with the potential to greatly enhance the reliability. This paper proposes the use of multi-cell reception to increase the URLLC spectral efficiency while satisfying the strict requirements using GF transmissions in a 5G new radio (NR) scenario. We evaluate the achievable URLLC capacity for an elaborate multi-cell reception parameter space and multi-cell combining techniques. In addition, we demonstrate that rethinking of the radio resource management (RRM) in the presence of multi-cell reception is needed to unleash the full potential of multi-cell reception in the context of UL GF URLLC. It is observed that multi-cell reception, compared to a single-cell reception, can provide URLLC capacity gains from 205{\%} to 440{\%} when the BSs are equipped with two receive antennas and 53{\%} to 22{\%} when BSs are equipped with four receive antennas, depending on whether the retransmissions are enabled.",
    keywords = "5G new radio, URLLC, grant-free, multi-cell reception, radio resource management, system level simulation, ultra-reliable low latency communications, uplink",
    author = "Jacobsen, {Thomas Haaning} and Abreu, {Renato Barbosa} and Gilberto Berardinelli and Pedersen, {Klaus Ingemann} and Istvan Kov{\'a}cs and {E. Mogensen}, Preben",
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    Multi-cell Reception for Uplink Grant-Free Ultra-Reliable Low-Latency Communications. / Jacobsen, Thomas Haaning; Abreu, Renato Barbosa; Berardinelli, Gilberto; Pedersen, Klaus Ingemann; Kovács, Istvan; E. Mogensen, Preben.

    I: IEEE Access, Bind 7, 8737674, 07.2019, s. 80208-80218.

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

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    AU - Abreu, Renato Barbosa

    AU - Berardinelli, Gilberto

    AU - Pedersen, Klaus Ingemann

    AU - Kovács, Istvan

    AU - E. Mogensen, Preben

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