Analysis of Broadcast Signaling for Millimeter Wave Cell Discovery

Yilin Li, Jian Luo, M. Castañeda, N. Vučić, Wen Xu, G. Caire
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引用次数: 6

Abstract

Millimeter wave (mm-wave) communication is essential for the next generation cellular networks. To exploit mm-wave frequencies, directional transmissions have to be applied to compensate the high propagation loss. Due to directional transmissions, initial access procedure of mm-wave communication systems needs specific design compared to conventional networks operating at sub-6 GHz. This paper focuses on an important step in the initial access procedure, namely broadcast signaling design for cell discovery. An analysis of such design is conducted based on an information theoretical approach, where four fundamental beam patterns, which cover most of the design options, are compared. Their performances in terms of cell discovery latency and signaling overhead are analyzed. The analysis reveals three key findings: (i) the average cell discovery latency depends only on beam duration and frame length, if the entire beacon interval can be accommodated in one frame; (ii) for low latency, single beam exhaustive scanning provides the best performance, but results in high signaling overhead; (iii) simultaneous multi-beam scanning can significantly reduce the overhead, and provide the flexibility to achieve trade-off between latency and overhead. The analytical results are verified by extensive simulations.
毫米波小区发现的广播信令分析
毫米波通信对下一代蜂窝网络至关重要。为了利用毫米波频率,必须采用定向传输来补偿高传播损耗。由于定向传输的原因,与传统的6 GHz以下网络相比,毫米波通信系统的初始接入过程需要特殊的设计。本文重点研究了初始接入过程中的一个重要步骤,即用于小区发现的广播信令设计。对这种设计进行了基于信息理论方法的分析,其中四种基本光束模式,涵盖了大多数设计选项,进行了比较。从蜂窝发现延迟和信令开销两方面分析了它们的性能。分析揭示了三个关键发现:(i)如果整个信标间隔可以容纳在一帧中,则平均蜂窝发现延迟仅取决于波束持续时间和帧长度;(ii)对于低延迟,单波束穷举扫描提供最佳性能,但导致高信号开销;(iii)同时多波束扫描可以显著降低开销,并提供灵活性,以实现延迟和开销之间的权衡。通过大量的仿真验证了分析结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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