Latency Critical IoT Applications in 5G: Perspective on the Design of Radio Interface and Network Architecture

Schulz, Philipp; Matthé, Maximilian; Klessig, Henrik; Simsek, Meryem; Fettweis, Gerhard; Ansari, Junaid; Ashraf, Shehzad; Almeroth, Bjoern; Voigt, Jens; Riedel, Ines; Puschmann, André; Mitschele‐Thiel, Andreas; Müller, Michael; Elste, Thomas; Windisch, Marcus

doi:10.1109/mcom.2017.1600435cm

Cited by 735 publications

(422 citation statements)

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“…Grant-free (GF) schemes have been considered as a solution for reducing the latency of uplink (UL) initiated transmissions, by skipping the steps of scheduling request and granting [3]. In case of unpredictable traffic, configured resources can be shared by a number of users to reduce waste [4].…”

Section: Introductionmentioning

confidence: 99%

Power control optimization for uplink grant-free URLLC

Abreu¹,

Jacobsen²,

Berardinelli³

et al. 2018

2018 IEEE Wireless Communications and Networking Conference (WCNC)

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Abstract-Ultra-reliable and low latency communication (URLLC) presents the most challenging use cases for fifth generation (5G) mobile networks. Traditionally the focus for mobile broadband has been to optimize the system throughput for high speed data traffic. However the optimization criteria for URLLC should focus on achieving small packets transmissions under strict targets such as 99.999% reliability within 1 ms. Power control is one candidate technology component for improving reliability and latency. In this work we investigate the power control for grant-free URLLC transmissions through extensive system level simulations in a urban outdoor scenario. We initially compare different settings for open loop power control (OLPC) with full and with fractional path loss compensation. Then we evaluate whether power boosting the retransmission can reduce the probability of packets delays under the 1 ms constraint. We also discuss the practical implication of applying power boosting. With full path loss compensation and boosting retransmissions, we show that a URLLC load such as 1200 small packets per second per cell can be achieved in the considered scenario.

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Section: Introductionmentioning

confidence: 99%

Power control optimization for uplink grant-free URLLC

Abreu¹,

Jacobsen²,

Berardinelli³

et al. 2018

2018 IEEE Wireless Communications and Networking Conference (WCNC)

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“…In which case, terminals operate in a coexistent and competitive way, continuously monitoring channels for opportunistic access. With strict reliability and latency constraints, many scenarios and particular environments [1]- [4] are emerging. Fig.…”

Section: Use Casesmentioning

confidence: 99%

Enabling Ultra-Reliable and Low-Latency Communications through Unlicensed Spectrum

et al. 2018

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In this article, we aim to address the question of how to exploit the unlicensed spectrum to achieve ultra-reliable, low-latency communications (URLLC). Potential URLLC PHY mechanisms are reviewed and then compared via simulations to demonstrate their potential benefits to URLLC. Although a number of important PHY techniques help with URLLC, the PHY layer exhibits an intrinsic trade-off between latency and reliability, posed by limited and unstable wireless channels. We then explore MAC mechanisms and discuss multi-channel strategies for achieving low-latency LTE unlicensed-band access. We demonstrate, via simulations, that the periods without access to the unlicensed band can be substantially reduced by maintaining channel access processes on multiple unlicensed channels, choosing the channels intelligently, and implementing RTS/CTS.

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“…These aspects are currently considered in the design of 5G new radio interface [18], [19], [20], with particular interest towards transmission reliability, faster procedures traffic resource allocation as well as hybrid automatic repeat request (HARQ) in both downlink and uplink directions.…”

Section: A Networking and Communication Protocolsmentioning

confidence: 99%