Effective Energy Efficiency of Ultra-reliable Low Latency Communication

Mohammad Shehab, Hirley Alves, Eduard A. Jorswieck, Endrit Dosti, Matti Latva-aho

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Effective capacity (EC) defines the maximum communication rate subject to a specific delay constraint, while effective energy efficiency (EEE) indicates the ratio between EC and power consumption. We analyze the EEE of ultrareliable networks operating in the finite-blocklength regime. We obtain a closed-form approximation for the EEE in quasistatic Nakagami- m (and Rayleigh as subcase) fading channels as a function of power, error probability, and latency. Furthermore, we characterize the quality-of-service constrained EEE maximization problem for different power consumption models, which shows a significant difference between finite and infinite-blocklength coding with respect to EEE and optimal power allocation strategy. As asserted in the literature, achieving ultrareliability using one transmission consumes a huge amount of power, which is not applicable for energy limited Internet-of-Things devices. In this context, accounting for empty buffer probability in machine-type communication (MTC) and extending the maximum delay tolerance jointly enhances the EEE and allows for adaptive retransmission of faulty packets. Our analysis reveals that obtaining the optimum error probability for each transmission by minimizing the nonempty buffer probability approaches EEE optimality, while being analytically tractable via Dinkelbach's algorithm. Furthermore, the results illustrate the power saving and the significant EEE gain attained by applying adaptive retransmission protocols, while sacrificing a limited increase in latency.

Original languageEnglish
Article number9328474
Pages (from-to)11135-11149
Number of pages15
JournalIEEE Internet of Things Journal
Volume8
Issue number14
Early online date2021
DOIs
Publication statusPublished - 15 Jul 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Delays
  • Effective energy efficiency
  • Error probability
  • finite blocklength
  • IoT
  • Measurement
  • optimal power allocation.
  • Power demand
  • Reliability
  • Resource management
  • Ultra reliable low latency communication
  • URLLC

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