Abstract
A clear understanding of mixed-numerology signals multiplexing and isolation in the physical layer is of importance to enable spectrum efficient radio access network (RAN) slicing, where the available access resource is divided into slices to cater to services/users with optimal individual design. In this paper, a RAN slicing framework is proposed and systematically analyzed from the physical layer perspective. According to the baseband and radio frequency (RF) configurations imparities among slices, we categorize four scenarios and elaborate on the numerology relationships of slices configurations. By considering the most generic scenario, system models are established for both uplink and downlink transmissions. Besides, a low out of band emission (OoBE) waveform is implemented in the system for the sake of signal isolation and inter-service/slice-band-interference (ISBI) mitigation. We propose two theorems as the basis of algorithms design in the established system, which generalize the original circular convolution property of discrete Fourier transform (DFT). Moreover, ISBI cancellation algorithms are proposed based on a collaboration detection scheme, where joint slices signal models are implemented. The framework proposed in the paper establishes a foundation to underpin extremely diverse use cases in 5G that implement on a common infrastructure.
Highlights
T HE fifth generation (5G) wireless network and beyond is supposed to facilitate a fully mobile and connected community, where a variety of use cases with very diverse requirements in terms of throughput, latency, reliability and Manuscript received June 24, 2019; revised December 1, 2019 and February 28, 2020; accepted April 17, 2020
We verify the established physical layer radio access network (RAN) slicing system model, the proposed power compensation algorithms and the ISBI cancellation algorithms for both uplink and downlink transmissions. Both OFDM and filtered orthogonal frequency division multiplexing (F-OFDM) waveforms are considered for comparison purposes
F-OFDM waveform with a matched filter at the receiver is considered for all simulations with windowed Sinc filter, and the filter length equals to half of the discrete Fourier transform (DFT) size [23]
Summary
T HE fifth generation (5G) wireless network and beyond is supposed to facilitate a fully mobile and connected community, where a variety of use cases with very diverse requirements in terms of throughput, latency, reliability and Manuscript received June 24, 2019; revised December 1, 2019 and February 28, 2020; accepted April 17, 2020. To underpin the system algorithms design, a generalized CCP-DFT (G-CCP-DFT) is proposed and theoretically investigated Another key challenge associated with the RAN slicing in the physical layer is the mixed-numerology signals multiplexing and isolation. We systematically derive the relationships among most of the key physical layer parameters, including subcarrier spacing, symbol duration, sampling rate, DFT size and waveforms for different scenarios, which constitutes the numerology framework for the proposed systems. We later use this as the basis for our algorithms and system design.
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