Leveraging massive MIMO spatial degrees of freedom to reduce random access delay

Ahsan, Fatima; Sabharwal, Ashutosh

doi:10.1109/acssc.2017.8335719

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…Thanks to mMIMO advances, large spatial diversity and multiplexing gains coupled with a large array gain can now be realized seamlessly. In addition, such advancements of mMIMO can be exploited to significantly enhance transmission reliability and spectral efficiency along with other critical performance metrics [23]- [28]. Thus, mMIMO has the potential for a substantial impact on GF random access in supporting a large number of URLLC devices [29]- [31].…”

Section: A Backgroundmentioning

confidence: 99%

Enabling Grant-Free URLLC: An Overview of Principle and Enhancements by Massive MIMO

Ding

Pokhrel

Park

et al. 2022

IEEE Internet Things J.

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Enabling ultra-reliable low-latency communication (URLLC) with stringent requirements for transmitting data packets (e.g., 99.999% reliability and 1 millisecond latency) presents considerable uplink transmission challenges. For each packet transmission over dynamically allocated network radio resources, the conventional random access protocols are based on a request-grant scheme. This induces excessive latency and necessitates reliable control signalling, resulting in overhead. To address these problems, grant-free (GF) solutions are proposed in the fifth-generation (5G) new radio (NR). In this paper, an overview and vision of the state-of-the-art in enabling GF URLLC are presented. In particular, we first provide a comprehensive review of NR specifications and techniques for URLLC, discuss underlying principles, and highlight impeding issues of enabling GF URLLC. Furthermore, we briefly explain two key phenomena of massive multiple-input multiple-output (mMIMO) (i.e., channel hardening and favorable propagation) and build several deep insights into how celebrated mMIMO features can be exploited to address the issues and enhance the performance of GF URLLC. Moving further ahead, we examine the potential of cell-free (CF) mMIMO and analyze its distinctive features and benefits over mMIMO to resolve GF URLLC issues. Finally, we identify future research directions and challenges in enabling GF URLLC with CF mMIMO.

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Section: A Backgroundmentioning

confidence: 99%

Enabling Grant-Free URLLC: An Overview of Principle and Enhancements by Massive MIMO

Ding

Pokhrel

Park

et al. 2022

IEEE Internet Things J.

View full text Add to dashboard Cite

show abstract

“…Thanks to mMIMO advances, large spatial diversity and multiplexing gains coupled with a large array gain can now be realized seamlessly. In addition, such advancements of mMIMO can be exploited to significantly enhance the transmission reliability and spectral efficiency along with other critical performance metrics [23]- [28]. Thus, mMIMO has the potential for substantial impact on GF random access in supporting a large number of URLLC devices [29]- [31].…”

Section: Introductionmentioning

confidence: 99%

Enabling Grant-Free URLLC: An Overview of Principle and Enhancements by Massive MIMO

Ding¹,

Pokhrel²,

Park³

et al. 2021

Preprint

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<div>Enabling ultra-reliable low-latency communication (URLLC) with stringent requirements for transmitting data packets (e.g., 99.999% reliability and 1 millisecond latency) presents considerable challenges in uplink transmissions. For each packet transmission over dynamically allocated network radio resources, the conventional random access protocols are based on a request- rant scheme. This induces excessive latency and necessitates reliable control signalling, resulting overhead. To address these problems, grant-free (GF) solutions are proposed in the fifth-generation (5G) new radio (NR). In this paper, an overview and vision of the state-of-the-art in enabling GF URLLC are presented. In particular, we first provide a comprehensive review of NR specifications and techniques for URLLC, discuss underlying principles, and highlight impeding issues of enabling GF URLLC. Furthermore, we explain two key phenomena of massive multiple-input multiple-output (mMIMO) (i.e., channel hardening and favorable propagation) and build several deep insights into how celebrated mMIMO features can be exploited to enhance the performance of GF URLLC. Moving further ahead, we examine the potential of cell-free (CF) mMIMO and analyze its distinctive features and benefits over mMIMO to resolve GF URLLC issues. Finally, we identify future research directions and challenges in enabling GF URLLC with CF mMIMO.</div>

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Spatial Based Pilot Allocation (SBPA) in Crowded Massive MIMO Systems

Afshar

Vakili

2021

Wireless Pers Commun

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Leveraging massive MIMO spatial degrees of freedom to reduce random access delay

Cited by 5 publications

References 7 publications

Enabling Grant-Free URLLC: An Overview of Principle and Enhancements by Massive MIMO

Enabling Grant-Free URLLC: An Overview of Principle and Enhancements by Massive MIMO

Enabling Grant-Free URLLC: An Overview of Principle and Enhancements by Massive MIMO

Spatial Based Pilot Allocation (SBPA) in Crowded Massive MIMO Systems

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