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Spectrum Reuse in the Terahertz Band for In-building Small Cell Networks

Authors:
Rony Kumer Saha

Keywords: 6G; clustering; energy efficiency; in-building; small cell; spectral efficiency; spectrum reuse; THz band.

Abstract:
In this paper, we present an analytical model to reuse spectrum in the Terahertz (THz) band in small cells located within a building. We characterize Co-Channel Interference (CCI) in the 140 GHz band and derive a minimum distance between co-channel small cells subject to satisfying predefined CCI interference constraints in both intra-floor and inter-floor levels. The set of small cells in both intra-floor and inter-floor levels constitute a 3-dimensional (3D) cluster of small cells. The whole THz spectrum allocated to a Mobile Network Operator (MNO) can be reused to small cells of each cluster. We derive system-level average capacity, spectral efficiency (SE), and energy efficiency (EE) metrics for an arbitrary number of L buildings of small cells located over a macrocell coverage. With extensive numerical and simulation results and analyses, we show that the 3D clustering of small cells in a building and reusing the same spectrum in the 140 GHz band to each cluster improve both the SE and EE performances. Further, it is shown that the expected SE and EE requirements for the future Sixth-Generation (6G) mobile networks can be achieved by reusing the spectrum in a fewer number of buildings of small cells than that required when no spectrum reuse is considered.

Pages: 30 to 35

Copyright: Copyright (c) IARIA, 2021

Publication date: April 18, 2021

Published in: conference

ISSN: 2308-4413

ISBN: 978-1-61208-837-2

Location: Porto, Portugal

Dates: from April 18, 2021 to April 22, 2021