Multi-Service Signal Multiplexing and Isolation for Physical-Layer Network Slicing (PNS)

Lei Zhang, A. Ijaz, J. Mao, P. Xiao, R. Tafazolli
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引用次数: 6

Abstract

Network slicing has been identified as one of the most important features for 5G and beyond to enable operators to utilize networks on an as-a-service basis and meet the wide range of use cases. In physical layer, the frequency and time resources are split into slices to cater for the services with individual optimal designs, resulting in services/slices having different baseband numerologies (e.g., subcarrier spacing) and / or radio frequency (RF) front-end configurations. In such a system, the multi-service signal multiplexing and isolation among the service/slices are critical for the Physical-Layer Network Slicing (PNS) since orthogonality is destroyed and significant inter-service/ slice-band-interference (ISBI) may be generated. In this paper, we first categorize four PNS cases according to the baseband and RF configurations among the slices. The system model is established by considering a low out of band emission (OoBE) waveform operating in the service/slice frequency band to mitigate the ISBI. The desired signal and interference for the two slices are derived. Consequently, one-tap channel equalization algorithms are proposed based on the derived model. The developed system models establish a framework for further interference analysis, ISBI cancelation algorithms, system design and parameter selection (e.g., guard band), to enable spectrum efficient network slicing.
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面向物理层网络切片(PNS)的多业务信号复用与隔离
网络切片已被确定为5G及以后最重要的功能之一,使运营商能够以“即服务”为基础利用网络,并满足广泛的用例。在物理层,频率和时间资源被分割成片,以满足具有单独优化设计的服务,从而导致服务/片具有不同的基带数字(例如,子载波间隔)和/或射频(RF)前端配置。在这种系统中,多业务信号的多路复用和业务/片之间的隔离对于物理层网络切片(PNS)至关重要,因为正交性被破坏,可能产生显著的业务/片间频带干扰(ISBI)。在本文中,我们首先根据片中的基带和射频配置对四种PNS进行了分类。通过考虑在业务/片频带工作的低带外发射(OoBE)波形来减轻ISBI,建立了系统模型。导出了两个切片所需的信号和干扰。在此基础上,提出了一抽头通道均衡算法。开发的系统模型为进一步的干扰分析、ISBI抵消算法、系统设计和参数选择(例如保护带)建立了框架,以实现频谱高效的网络切片。
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