Contention-Based Access for Ultra-Reliable Low Latency Uplink Transmissions

Singh, Bikramjit; Tirkkonen, Olav; Li, Zexian; Uusitalo, Mikko A.

doi:10.1109/lwc.2017.2763594

Cited by 133 publications

(87 citation statements)

References 11 publications

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“…We generate multiple instances of (N, H), i.e. number of transmitting devices, their channel gains and patterns accordingly (DSA or Steiner), and evaluate the effective SNR according to (4) and (5). Figures 4 and 5 show the outage probability performance as function of the SINR threshold θ, for the MRC receiver in the collision and MUI models, with random and deterministic repetition coding.…”

Section: B Multi-user Interference Modelmentioning

confidence: 99%

Non-Orthogonal Contention-Based Access for URLLC Devices with Frequency Diversity

Boyd

Kotaba

Tirkkonen

et al. 2019

2019 IEEE 20th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

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We study coded multichannel random access schemes for ultra-reliable low-latency uplink transmissions. We concentrate on non-orthogonal access in the frequency domain, where users transmit over multiple orthogonal subchannels and inter-user collisions limit the available diversity. Two different models for contention-based random access over Rayleigh fading resources are investigated. First, a collision model is considered, in which the packet is replicated onto K available resources, K ≤ K of which are received without collision, and treated as diversity branches by a maximum-ratio combining (MRC) receiver. The resulting diversity degree K depends on the arrival process and coding strategy. In the second model, the slots subject to collisions are also used for MRC, such that the number of diversity branches K is constant, but the resulting combined signal is affected by multiple access interference. In both models, the performance of random and deterministic repetition coding is compared. The results show that the deterministic coding approach can lead to a significantly superior performance when the arrival rate of the intermittent URLLC transmissions is low.

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Section: B Multi-user Interference Modelmentioning

confidence: 99%

Non-Orthogonal Contention-Based Access for URLLC Devices with Frequency Diversity

Boyd

Kotaba

Tirkkonen

et al. 2019

2019 IEEE 20th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

Self Cite

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“…In a context similar to what we consider here, the authors in [10] propose to send these replicas in consecutive TTIs, where the resources used by each replica are randomly selected from the set of available RUs in each TTI; our scheme provides more flexibility in the resource allocation process of these replicas, which results in less collisions between the (re)transmitted packets. In [11], an uplink transmission scheme is proposed in which the resources are split into shared and dedicated parts.…”

Section: Sporadic Packet Arrivalsmentioning

confidence: 99%

“…We take as baseline the Aloha-like scheme where each packet is transmitted once in one of the available resources (called URT of Unique Random Transmission). We also simulate the scheme of [10] where the replicas are sent in consecutive TTIs (called OT for One Transmission per TTI). In order to have comparable results between OT and RT, we consider the same number of replicas (β = 2) in both (UT corresponds to one replica).…”

Section: A Computation Of the Loss Probabilitymentioning

confidence: 99%

Radio Resource Allocation and Retransmission Schemes for URLLC Over 5G Networks

Elayoubi

Brown

Deghel

et al. 2019

IEEE J. Select. Areas Commun.

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Low latency targets for Ultra-Reliable Low Latency Communications (URLLC) may be conflicting with their stringent reliability requirements due to the need for re-transmissions. We explore in this paper the different resource allocation schemes for transmissions and re-transmissions depending on the requirements of the underlying service and on the traffic characteristics, focusing on Industrial Internet of Things (IIoT). We namely consider schemes with individual reservation versus a pool of contention-based reserved resources. We provide novel resource allocation schemes for initial transmissions and re-transmissions and derive corresponding analytical models for loss rates. We then show how to set the system parameters that allow meeting the URLLC requirements with low resource consumption.

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“…For example, the authors in [8] optimized the transmission power, bandwidth and antenna allocation to maximize the energy efficiency in URLLC. In [12], the authors studied the optimal number of consecutive multiple transmissions based on the allocated wireless resource for randomly emerging URLLC packet transmission. In [13], the authors analyzed the feasibility that using multiple available communication interfaces to maintain QoS requirements in URLLC.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Communication QoS Design for Real-Time Wireless Control Systems

et al. 2020

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In the coming fifth-generation (5G) cellular networks, ultra-reliable and low-latency communication (URLL-C) is treated as an indispensable service to enable real-time wireless control systems. However, the extremely high qualityof-service (QoS) in URLLC causes significant wireless resource consumption. Moreover, to obtain good control performance may not always require extremely high communication QoS. In this paper, we propose a communication-control co-design scheme to reduce wireless resource consumption, where we obtain a dynamic communication QoS design method to reduce the energy consumption by jointly using extremely high QoS and a relatively low QoS. In this scheme, we first explore the control process served by different communication QoS levels and find that the whole control process can be divided into two phases, where different QoS levels have their advantages in different phases. Then, we obtain a threshold to decide when the extremely high QoS or relatively low QoS should be provided by communications. Simulation results demonstrate that our method can effectively reduce communication energy consumption while maintaining good control performance.

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Contention-Based Access for Ultra-Reliable Low Latency Uplink Transmissions

Cited by 133 publications

References 11 publications

Non-Orthogonal Contention-Based Access for URLLC Devices with Frequency Diversity

Non-Orthogonal Contention-Based Access for URLLC Devices with Frequency Diversity

Radio Resource Allocation and Retransmission Schemes for URLLC Over 5G Networks

Dynamic Communication QoS Design for Real-Time Wireless Control Systems

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