Wireless Access in Ultra-Reliable Low-Latency Communication (URLLC)

Popovski, Petar; Stefanović, Čedomir; Nielsen, Jimmy Jessen; Carvalho, Elisabeth de; Angjelichinoski, Marko; Trillingsgaard, Kasper F.; Bana, Alexandru-Sabin

doi:10.1109/tcomm.2019.2914652

Cited by 391 publications

(245 citation statements)

References 64 publications

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“…However, the situation is different for URLLC cases as the data payloads are small, with size comparable to the metadata, and transmissions are subject to tight reliability and latency constraints [59], [61]. While most of the existing contributions have mainly focused on various aspects of data scheduling (see e.g.…”

Section: B Motivation and Main Contributionsmentioning

confidence: 99%

On the Multiplexing of Data and Metadata for Ultra-Reliable Low-Latency Communications in 5G

Karimi

Pedersen

Mahmood

et al. 2020

IEEE Trans. Veh. Technol.

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This paper addresses the problem of downlink radio resource management for ultra-reliable low-latency communications (URLLC) in fifth generation (5G) systems. To support low-latency communications, we study performance of two multiplexing schemes namely in-resource control signalling and joint encoding of data and metadata. In the former, the metadata and data are separately encoded and the metadata is sent at the beginning of transmission time prior to the data. Thus, it benefits from a low-complexity receiver structure to decode the data block. The latter takes advantages of transmitting a larger blocklength to enhance the reliability and improve spectrum efficiency by jointly encoding data and metadata as a single codeword. Dealing with small URLLC payloads, the overhead and error of sending metadata are not negligible and have a significant impact on the system performance in terms of resource usage the reliability of transmission. For each scheme, we derive expressions for the outage probability and resource usage by taking into account impacts of the finite blocklength payloads, overhead and error of sending metadata, and probability of error in uplink feedback channel. We propose a novel framework for joint data and metadata link adaptation to minimize the average number of allocated resources, while ensuring the stringent URLLC quality of service requirements. An optimization problem is formulated for each scheme that is mixed-integer nonconvex problem, difficult to solve in polynomial time. Solutions based on successive convex optimization are proposed. Numerical evaluations show that the proposed algorithms perform close to the optimal solution and demonstrate remarkable gains of up to 27% improvement in resource usage. Finally, we present sensitivity analysis of the results for various network parameters.

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Section: B Motivation and Main Contributionsmentioning

confidence: 99%

On the Multiplexing of Data and Metadata for Ultra-Reliable Low-Latency Communications in 5G

Karimi

Pedersen

Mahmood

et al. 2020

IEEE Trans. Veh. Technol.

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“…These novel applications have very stringent and diverse communication requirements such as coverage, data rate, latency and reliability. To meet these diverse communication requirements of diverse applications, the International Telecommunication Union (ITU) has classified fifth-generation new-radio (5G NR) services into three categories: ultra-reliable and low-latency communication (URLLC), enhanced mobile broadband (eMBB), and massive machine type communication (mMTC) [1]. Among these services, URLLC is designed for the eventdriven, mission-critical, and industrial scenarios, in which it can contribute to meet the quality-of-service (QoS) requirements such as ultra-low latency and ultra-high reliability.…”

Section: Introductionmentioning

confidence: 99%

Contract-Based Scheduling of URLLC Packets in Incumbent EMBB Traffic

et al. 2020

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Recently, the coexistence of ultra-reliable and low-latency communication (URLLC) and enhanced mobile broadband (eMBB) services on the same licensed spectrum has gained a lot of attention from both academia and industry. However, the coexistence of these services is not trivial due to the diverse multiple access protocols, contrasting frame distributions in the existing network, and the distinct quality of service requirements posed by these services. Therefore, such coexistence drives towards a challenging resource scheduling problem. To address this problem, in this paper, we first investigate the possibilities of scheduling URLLC packets in incumbent eMBB traffic. In this regard, we formulate an optimization problem for coexistence by dynamically adopting a superposition or puncturing scheme. In particular, the aim is to provide spectrum access to the URLLC users while reducing the intervention on incumbent eMBB users. Next, we apply the one-to-one matching game to find stable URLLC-eMBB pairs that can coexist on the same spectrum. Then, we apply the contract theory framework to design contracts for URLLC users to adopt the superposition scheme. Simulation results reveal that the proposed contract-based scheduling scheme achieves up to 63% of the eMBB rate for the "No URLLC" case compared to the "Puncturing" scheme. INDEX TERMS Contract theory, enhance mobile broadband (eMBB), fifth-generation new radio, matching theory, scheduling, ultra-reliable and low-latency communication (URLLC).

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“…The fifth generation (5G) of the mobile networks is envisioned to feature different service classes: ultra-reliable low-latency communications (URLLC), massive machine type communications (mMTC), and enhanced mobile broadband (eMBB). While eMBB aims at high spectral efficiency, hard latency (e.g., 1 ms) and reliability requirements (target BLER in between 10 -5 and 10 -9 ) are essential for URLLC applications [1][2][3][4]. In essence, the stringent latency and reliability requirements of URLLC enable new emerging use cases such as factory automation, drone communication, remote control and remote surgery.…”

Section: Introductionmentioning

confidence: 99%

“…In essence, the stringent latency and reliability requirements of URLLC enable new emerging use cases such as factory automation, drone communication, remote control and remote surgery. An important use case for URLLC is factory automation with latency requirement of 1 ms and reliability requirement of 99.999% [1][2][3][4]. For such use case, it is crucial to assess the overall system level performance for a co-existence scenario where a local factory network has to fulfill the desired latency and reliability requirements while being interfered by the overlaid macro network offering wide area coverage in the same frequency band.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation for the Co-Existence of eMBB and URLLC Networks: Synchronized versus Unsynchronized TDD

Challita

Hiltunen

Tercero

2019

2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)

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To ensure the high level of automation required in today's industrial applications, next-generation wireless networks must enable real-time control and automation of dynamic processes with the requirements of extreme low-latency and ultrareliable communications. In this paper, we provide a performance assessment for the co-existence of a macro (eMBB) and a local factory (URLLC) network and evaluate the network conditions under which the latency and reliability requirements of factory automation applications are met. In particular, we evaluate the coexistence of the eMBB and URLLC networks under two scenarios: (i) synchronized TDD, in which both networks follow the same TDD pattern, and (ii) unsynchronized TDD, in which the eMBB and URLLC networks follow different TDD patterns. Simulation results show that the high downlink interference from the macro base stations towards the factory results in a reduction of the downlink URLLC capacity and service availability in case of synchronized TDD and a reduction of the uplink URLLC capacity and service availability in case of unsynchronized TDD. Finally, it is shown that a promising case for co-existence is the adjacent channel allocation, for both synchronized and unsynchronized TDD deployments. Here, the required isolation to protect the URLLC network in the worst-case scenario where the factory is located next to a macro site can be handled via the factory wall penetration loss (e.g., considering high concrete or metal-coated building walls) along with other solutions such as filters, larger separation distance, and band pairing. Index Terms -5G, URLLC, eMBB, factory automation, coexistence, unsynchronized TDD.I.

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Wireless Access in Ultra-Reliable Low-Latency Communication (URLLC)

Cited by 391 publications

References 64 publications

On the Multiplexing of Data and Metadata for Ultra-Reliable Low-Latency Communications in 5G

On the Multiplexing of Data and Metadata for Ultra-Reliable Low-Latency Communications in 5G

Contract-Based Scheduling of URLLC Packets in Incumbent EMBB Traffic

Performance Evaluation for the Co-Existence of eMBB and URLLC Networks: Synchronized versus Unsynchronized TDD

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