Power-Efficient Beam Tracking During Connected Mode DRX in mmWave and Sub-THz Systems
Power-Efficient Beam Tracking During Connected Mode DRX in mmWave and Sub-THz Systems
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DOI：
10.1109/jsac.2021.3071791
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发表时间：
2020-10
影响因子：
16.4
通讯作者：
S. Shah;Sundar Aditya;S. Rangan
中科院分区：
文献类型：
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作者：
S. Shah;Sundar Aditya;S. Rangan
不连续接收（DRX）是现代蜂窝系统中的关键功率节省特征，其中用户设备（UE）暂时禁用其接收机。由于前端功耗高，DRX可能被积极地用于毫米波和亚太赫兹频率。在这些频率下，DRX的一个关键挑战是阻塞引起的链路中断：UE可能需要跟踪许多定向链路以确保可靠的多连接，从而增加功耗。在本文中，我们探讨了在连接模式DRX的链路跟踪，降低功耗的跟踪只有一小部分的可用链路，但没有不利影响的中断和吞吐量性能的强盗算法。通过在28 GHz（5G）和140 GHz（6G）下进行详细的系统级仿真，我们观察到即使是次优的链路跟踪策略也可以实现相当大的功率节省，而中断和吞吐量性能的下降相对较小，特别是在UE处的数字波束成形。特别是，我们表明，它是可行的，以减少75%的功耗，仍然实现高达95%（80%）的最大吞吐量使用数字波束成形在28 GHz（140 GHz），受中断概率最多为1%。
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%.