Power-efficient beam tracking during connected mode DRX in mmWave and sub-THz systems
| Autor: | Syed Hashim Ali Shah, Sundar Aditya, Sundeep Rangan |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Beamforming
Technology Computer Networks and Communications Computer science sub-terahertz (THz) communications Wireless communication Discontinuous reception (DRX) COMMUNICATION 0805 Distributed Computing 02 engineering and technology millimeter wave (mmWave) communications Amplitude modulation Engineering 5G mobile communication 3GPP 1005 Communications Technologies 0202 electrical engineering electronic engineering information engineering Electronic engineering Wireless Electrical and Electronic Engineering Throughput (business) 6G BLOCKAGE Science & Technology business.industry Physical layer Engineering Electrical & Electronic 020206 networking & telecommunications Throughput multiple-play multi-armed bandits (MP-MAB) Power (physics) 0906 Electrical and Electronic Engineering User equipment CARRIER AGGREGATION Array signal processing Telecommunications Power demand power-efficient beam tracking Discontinuous reception TUTORIAL Networking & Telecommunications business 5G |
| DOI: | 10.36227/techrxiv.13046447 |
| Popis: | 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 reinforcement learning-based link tracking policies 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%. |
| Databáze: | OpenAIRE |
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