Preemptive Scheduling of Latency Critical Traffic and Its Impact on Mobile Broadband Performance

Pedersen, Klaus I.; Pocovi, Guillermo; Steiner, Jens

doi:10.1109/vtcspring.2018.8417637

Cited by 19 publications

(12 citation statements)

References 12 publications

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“…If URLLC queuing is foreseen, due to resource shortage, PS scheduler instantly overwrites part of the ongoing eMBB transmissions for immediate URLLC scheduling, at the expense of a highly degraded eMBB SE. Subsequently, enhanced PS (E-PS) scheduler [23] is recently introduced to provide an improved ergodic capacity by informing the victim eMBB users of which physical resource blocks (PRBs) have been punctured by URLLC transmissions, in order to avoid erroneous Chase combing HARQ process, i.e., punctured resources are considered information-less. Code-block (CB) based HARQ retransmission [24], [25] schemes are also proposed to reduce the overhead size of the punctured eMBB re-transmissions; however, a multi-bit HARQ ACK/NACK is required.…”

Section: A State Of the Art Urllc Scheduling Studiesmentioning

confidence: 99%

“…PS scheduler has shown sound improvement of the URLLC latency performance; however, with a highly degraded SE, due to the eMBB unrealizable punctured transmissions. [23]: E-PS scheduler is an improved version of the conventional PS scheduler, which is recently proposed to partially recover the lost eMBB capacity due to puncturing. Punctured eMBB UEs are presumed to be aware of which resources are being punctured by URLLC traffic.…”

Section: Analytical Analysis Compared To State Of the Art Urllc Scmentioning

confidence: 99%

“…Thus, victim eMBB UEs disregard the punctured PRBs from the Chase combining HARQ process in order not to spread the decoding errors. Furthermore, two code-block (CB) mapping layouts [23]- [25] are evaluated as: fully interleaved (FI), and frequency first (FF) layouts, respectively. The former indicates that CBs associated with an eMBB transport block (TB) are fully interleaved over the time and frequency resources, however, the latter means that CBs are spread over the frequency domain and condensed over the time domain.…”

Section: Analytical Analysis Compared To State Of the Art Urllc Scmentioning

confidence: 99%

See 2 more Smart Citations

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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Section: A State Of the Art Urllc Scheduling Studiesmentioning

confidence: 99%

Section: Analytical Analysis Compared To State Of the Art Urllc Scmentioning

confidence: 99%

Section: Analytical Analysis Compared To State Of the Art Urllc Scmentioning

confidence: 99%

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

Esswie

Pedersen

2018

IEEE Access

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“…The efficient multiplexing of eMBB and URLLC in downlink can be achieved by dynamic scheduling, with the high priority URLLC transmissions puncturing the eMBB allocation [4]. In uplink, similar concept can be employed with preemption schemes, both for intra-UE (for the same UE) and for inter-UE (between different UEs) traffic multiplexing.…”

Section: Introductionmentioning

confidence: 99%

System Level Analysis of eMBB and Grant-Free URLLC Multiplexing in Uplink

Abreu

Jacobsen

Pedersen

et al. 2019

2019 IEEE 89th Vehicular Technology Conference (VTC2019-Spring)

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5th generation radio networks should efficiently support services with diverse requirements. For achieving better resource utilization, the sharing of the radio channel between the different services is an attractive solution. While the downlink multiplexing can be well accomplished with dynamic scheduling, efficient multiplexing of enhanced mobile broadband (eMBB) and ultra-reliable low-latency communications (URLLC) in uplink is still an open problem. In particular, we consider the case of URLLC using grant-free allocation for sporadic transmissions, multiplexed on shared resources with eMBB with high data volume. Since the moment in which a grant-free transmission occurs is not known, URLLC and eMBB transmissions overlay. Power control settings are then assessed as a way to manage the performance trade-off between the services. Due to the complexity of 5G NR, the evaluation is based on advanced system level simulations. Insights regarding the configuration of fractional power control settings upon the coexistence of the different services are presented.

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“…Spatial diversity techniques are also considered key enablers for URLLC, to enhance the URLLC decoding ability by preserving a sufficient signalto-interference-noise-ratio (SINR) level [10,11]. Moreover, URLLC preemptive scheduling (PS) [12] is a state-of-theart technique to instantly schedule sporadic URLLC traffic with minimum queuing delay. If the radio resources are monopolized by ongoing eMBB transmissions, PS scheduler immediately overwrites part of eMBB physical resource blocks (PRBs) for the sake of the incoming URLLC traffic.…”

Section: Introductionmentioning

confidence: 99%

Capacity Optimization of Spatial Preemptive Scheduling for Joint URLLC-eMBB Traffic in 5G New Radio

Esswie¹,

Pedersen²

2018

2018 IEEE Globecom Workshops (GC Wkshps)

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Ultra-reliable and low-latency communication (URLLC) is envisioned as a primary service class of the fifth generation mobile networks. URLLC applications demand stringent radio latency requirements of 1 millisecond with 99.999% confidence. Obviously, the coexistence of the URLLC services and enhanced mobile broadband (eMBB) applications on the same spectrum imposes a challenging scheduling problem. In this paper, we propose an enhanced spatial preemptive scheduling framework for URLLC-eMBB traffic coexistence. The proposed scheduler ensures an instant and interference-free signal subspace for critical URLLC transmissions, while achieving best-effort eMBB performance. Furthermore, the impacted eMBB capacity is then recovered by limited network-assisted signaling. The performance of the proposed scheduler is evaluateeed by highly detailed system level simulations of the major performance indicators. Compared to the state-of-the-art multi-traffic schedulers from industry and academia, the proposed scheduler meets the stringent URLLC latency requirements, while significantly improving the achievable ergodic capacity.

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Preemptive Scheduling of Latency Critical Traffic and Its Impact on Mobile Broadband Performance

Cited by 19 publications

References 12 publications

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

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

System Level Analysis of eMBB and Grant-Free URLLC Multiplexing in Uplink

Capacity Optimization of Spatial Preemptive Scheduling for Joint URLLC-eMBB Traffic in 5G New Radio

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