Hierarchical Resource Allocation: Balancing Throughput and Energy Efficiency in Wireless Systems

Bho Matthiesen, Eduard A. Jorswieck, Petar Popovski

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Abstract

A main challenge of 5G and beyond wireless systems is to efficiently utilize the available spectrum and simultaneously reduce the energy consumption. From the radio resource allocation perspective, the solution to this problem is to maximize the energy efficiency instead of the throughput. This results in the optimal benefit-cost ratio between data rate and energy consumption. It also often leads to a considerable reduction in throughput and, hence, an underutilization of the available spectrum. Contemporary approaches to balance these metrics based on multi-objective programming theory often lack operational meaning and finding the correct operating point requires careful experimentation and calibration. Instead, we propose the novel concept of hierarchical resource allocation where conflicting objectives are ordered by their importance. This results in a resource allocation algorithm that strives to minimize the transmit power while keeping the data rate close the maximum achievable throughput. In a typical multi-cell scenario, this strategy is shown to reduces the transmit power consumption by 65% at the cost of a 5% decrease in throughput. Moreover, this strategy also saves energy in scenarios where global energy efficiency maximization fails to achieve any gain over throughput maximization.

Original languageEnglish
Title of host publication2021 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)
Number of pages6
PublisherIEEE
Publication date29 Mar 2021
Pages1-6
Article number9420039
ISBN (Print)978-1-7281-9508-7
ISBN (Electronic)978-1-7281-9507-0
DOIs
Publication statusPublished - 29 Mar 2021
Event 2021 IEEE Wireless Communications and Networking Conference Workshops (WCNCW) - Nanjing, China
Duration: 29 Mar 202129 Mar 2021

Conference

Conference 2021 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)
CountryChina
CityNanjing
Period29/03/202129/03/2021

Keywords

  • Global optimization
  • Hierarchical optimization
  • Mixed monotonic programming
  • Multi-objective programming

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