A Centralized and Scalable Uplink Power Control Algorithm in Low SINR Scenarios

Xuesong Cai, István Z. Kovács, Jeroen Wigard, Preben E. Mogensen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Power control is becoming increasingly essential for the fifth-generation (5G) and beyond systems. An example use-case, among others, is the unmanned-aerial-vehicle (UAV) communications where the nearly line-of-sight (LoS) radio channels may result in very low signal-to-interference-plus-noise ratios (SINRs). The authors in (Chiang et al., 2007) proposed to efficiently and reliably solve this kind of non-convex problem via a series of geometrical programmings (GPs) using condensation approximation. However, it is only applicable for a small-scale network with several communication pairs and practically infeasible with more (e.g., tens of) nodes to be jointly optimized. We therefore in this paper aim to provide new insights into this problem. By properly introducing auxiliary variables, the problem is transformed to an equivalent form which is simpler and more intuitive for condensation. A novel condensation method with linear complexity is also proposed based on the form. The enhancements make the GP-based power control feasible for both small- and especially large-scale networks that are common in 5G and beyond. The algorithm is verified via simulations. A preliminary case study of uplink UAV communications also shows the potential of the algorithm.

Original languageEnglish
JournalI E E E Transactions on Vehicular Technology
Volume70
Issue number9
Pages (from-to)9583-9587
Number of pages5
ISSN0018-9545
DOIs
Publication statusPublished - Sep 2021

Keywords

  • 5G mobile communication
  • Interference
  • Power control
  • Quality of service
  • Resource management
  • Signal to noise ratio
  • Uplink

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