4.7 Article

Power-Efficient Beam Tracking During Connected Mode DRX in mmWave and Sub-THz Systems

Journal

IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
Volume 39, Issue 6, Pages 1711-1724

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSAC.2021.3071791

Keywords

Power demand; Array signal processing; Amplitude modulation; Throughput; 5G mobile communication; 3GPP; Wireless communication; Discontinuous reception (DRX); multiple-play multi-armed bandits (MP-MAB); power-efficient beam tracking; sub-terahertz (THz) communications; millimeter wave (mmWave) communications; 5G; 6G

Funding

  1. National Science Foundation [1302336, 1564142, 1547332]
  2. National Institute of Standards and Technology (NIST)
  3. Semiconductor Research Corporation (SRC)
  4. NYU WIRELESS
  5. Center for Advanced Technology in Telecommunications (CATT), New York University
  6. Direct For Computer & Info Scie & Enginr
  7. Division of Computing and Communication Foundations [1564142] Funding Source: National Science Foundation

Ask authors/readers for more resources

Bandit algorithms for link tracking in DRX at high frequencies can reduce power consumption by tracking only a fraction of available links without affecting outage and throughput performance. Simulation results show that even sub-optimal link tracking policies can achieve significant power savings with relatively little degradation in performance, especially with digital beamforming enabled at the UE.
Discontinuous reception (DRX), wherein a user equipment (UE) temporarily disables its receiver, is a critical power saving feature in modern cellular systems. DRX is likely to be aggressively used at mmWave and sub-THz frequencies due to the high front-end power consumption. A key challenge for DRX at these frequencies is blockage-induced link outages: a UE will likely need to track many directional links to ensure reliable multi-connectivity, thereby increasing the power consumption. In this paper, we explore bandit algorithms for link tracking in connected mode DRX that reduce power consumption by tracking only a fraction of the available links, but without adversely affecting the outage and throughput performance. Through detailed, system level simulations at 28 GHz (5G) and 140 GHz (6G), we observe that even sub-optimal link tracking policies can achieve considerable power savings with relatively little degradation in outage and throughput performance, especially with digital beamforming at the UE. In particular, we show that it is feasible to reduce power consumption by 75% and still achieve up to 95% (80%) of the maximum throughput using digital beamforming at 28 GHz (140 GHz), subject to an outage probability of at most 1%.

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