Achieving Ultra-Reliable Low-Latency Communications: Challenges and Envisioned System Enhancements

Pocovi, Guillermo; Shariatmadari, Hamidreza; Berardinelli, Gilberto; Pedersen, Klaus I.; Steiner, Jens; Li, Zexian

doi:10.1109/mnet.2018.1700257

Cited by 132 publications

(87 citation statements)

References 9 publications

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“…The simulator models the 5G NR design, adopting the commonly agreed mathematical models in 3GPP for radio propagation, traffic models, key performance indicators, etc [10]. The same simulator was also used in the earlier URLLC studies published in [4], [13], [17]. The network layout is a single layer urban macro network consisting of 7 sites, each having 3 sectors composing a regular hexagonal grid topology with 500 meters of inter-site distance (ISD), using wrap-around [21].…”

Section: Simulation Methodologymentioning

confidence: 99%

“…Meeting the strict URLLC requirements with a 10 −5 packet failure probability within 1 ms is very challenging [1]. Many technology components towards achieving this have been investigated such as short transmission time intervals (TTIs) [2], semi-persistent scheduling (SPS) [3], fast hybrid automatic repeat request (HARQ) [4], and robust error correction coding [5].…”

Section: Introductionmentioning

confidence: 99%

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Joint Resource Configuration and MCS Selection Scheme for Uplink Grant-Free URLLC

Jacobsen

Abreu

Berardinelli

et al. 2018

2018 IEEE Globecom Workshops (GC Wkshps)

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Ultra-reliable and low-latency communications (URLLC) addresses the most challenging set of services for 5G New Radio. Uplink grant-free transmissions is recognized as a promising solution to meet the ambitious URLLC target (1 ms latency at a 99.999% reliability). Achieving such a high reliability comes at the expense of poor spectral efficiency, which ultimately affects the load supported by the system. This paper proposes a joint resource allocation solution including multiple modulation and coding schemes (MCSs) and power control settings for grant-free uplink transmissions on shared resources. The scheme assigns smaller bandwidths parts and higher MCS to the UEs in good average channel conditions, reducing the probability of fully overlapping transmissions. The performance analysis shows that the scheme is capable of increasing the system outage capacity by ∼90%, compared to prior art solutions using a conservative single-MCS configuration with fully overlapping transmissions.

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Section: Simulation Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Joint Resource Configuration and MCS Selection Scheme for Uplink Grant-Free URLLC

Jacobsen

Abreu

Berardinelli

et al. 2018

2018 IEEE Globecom Workshops (GC Wkshps)

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“…2 Notice that we focus the analysis on the reference user only. 3 BBU at CRAN enables coordinated multipoint transmission similar to scenario described in [4], [5] and [12]. with,…”

Section: System Modelmentioning

confidence: 99%

“…Some of the major challenges and key component issues related to ultra-reliability are enhanced control channel reliability, link adaptation, interference mitigation. Also, notice that coexistence with other services such as eMBB is related with pre-emptive scheduling and link adaptation [3]. These metrics make physical layer design of URLLC very complicated [4].…”

Section: Introductionmentioning

confidence: 99%

Achieving Ultra-Reliable Communication via CRAN-Enabled Diversity Schemes

Kharel

López

Alves

2019

2019 European Conference on Networks and Communications (EuCNC)

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Internet of things is in progress to build a smart society, and wireless networks are critical enablers for many of its use cases. In this paper, we present a multi-coordinated transmission scheme to achieve ultra-reliability for critical machine-type wireless communication networks. We take advantage of diversity, which is fundamental for dealing with fading channel impairments, and for achieving ultra-reliable region of operation in order of five 9's as defined by 3GPP standardization bodies. We evaluate an interference-limited network composed of multiple remote radio heads that are allowed to cooperate, by keeping silence thus reducing interference, or by performing more elaborated strategies such as maximal ratio transmission, in order to serve a user equipment with ultra-reliability. We provide extensive numerical analysis and discuss the gains of cooperation by the centralized radio access network.

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“…For instance, to satisfy such unprecedented URLLC requirements, the system should be forcibly engineered such that blocking URLLC packets is a rare event. This can be achieved by setting an extremely tight block error rate (BLER) to preserve a sufficient URLLC signal-to-interference-noiseratio (SINR) [10]. Consequently, URLLC users must fulfill their outage capacity of interest [11] at the expense of the overall ergodic capacity, leading to a severe loss of the network SE.…”

Section: Introductionmentioning

confidence: 99%

Opportunistic Spatial Preemptive Scheduling for URLLC and eMBB Coexistence in Multi-User 5G Networks

Esswie

Pedersen

2018

IEEE Access

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The fifth generation (5G) of the mobile networks is envisioned to feature two major service classes: ultra-reliable low-latency communications (URLLC) and enhanced mobile broadband (eMBB). URLLC applications require a stringent one-way radio latency of 1 ms with 99.999% success probability while eMBB services demand extreme data rates. The coexistence of the URLLC and eMBB quality of service (QoS) on the same radio spectrum leads to a challenging scheduling optimization problem, that is vastly different from that of the current cellular technology. This calls for the novel scheduling solutions which cross-optimize the system performance on a user-centric, instead of network-centric basis. In this paper, a null-space-based spatial preemptive scheduler for joint URLLC and eMBB traffic is proposed for the densely populated 5G networks. Proposed scheduler framework seeks for cross-objective optimization, where the critical URLLC QoS is guaranteed while extracting the maximum possible eMBB ergodic capacity. It utilizes the system spatial degrees of freedom in order to instantly offer an interference-free subspace for the critical URLLC traffic. Thus, a sufficient URLLC decoding ability is always preserved, and with the minimal impact on the eMBB performance. Analytical analysis and extensive system level simulations are conducted to evaluate the performance of the proposed scheduler against the state-of-the-art scheduler proposals from industry and academia. Simulation results show that the proposed scheduler offers extremely robust URLLC latency performance with a significantly improved ergodic capacity.INDEX TERMS 5G, radio resource management, scheduling, ultra-reliable low-latency communications (URLLC), enhanced mobile broadband (eMBB), MU-MIMO, preemptive, null space.

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Achieving Ultra-Reliable Low-Latency Communications: Challenges and Envisioned System Enhancements

Cited by 132 publications

References 9 publications

Joint Resource Configuration and MCS Selection Scheme for Uplink Grant-Free URLLC

Joint Resource Configuration and MCS Selection Scheme for Uplink Grant-Free URLLC

Achieving Ultra-Reliable Communication via CRAN-Enabled Diversity Schemes

Opportunistic Spatial Preemptive Scheduling for URLLC and eMBB Coexistence in Multi-User 5G Networks

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