Coexistence of Wi-Fi and Heterogeneous Small Cell Networks Sharing Unlicensed Spectrum
Haijun Zhang, Xiaoli Chu, Weisi Guo, Siyi Wang

TL;DR
This paper explores how Wi-Fi and small cell cellular networks can coexist in unlicensed spectrum bands, proposing interference mitigation techniques to enhance capacity without degrading Wi-Fi performance.
Contribution
It introduces a novel network architecture and interference avoidance schemes enabling coexistence of Wi-Fi and small cell networks sharing unlicensed spectrum.
Findings
Significant capacity increase for 4G small cell networks.
Wi-Fi performance remains unaffected by coexistence strategies.
Proposed schemes outperform existing interference mitigation methods.
Abstract
As two major players in terrestrial wireless communications, Wi-Fi systems and cellular networks have different origins and have largely evolved separately. Motivated by the exponentially increasing wireless data demand, cellular networks are evolving towards a heterogeneous and small cell network architecture, wherein small cells are expected to provide very high capacity. However, due to the limited licensed spectrum for cellular networks, any effort to achieve capacity growth through network densification will face the challenge of severe inter-cell interference. In view of this, recent standardization developments have started to consider the opportunities for cellular networks to use the unlicensed spectrum bands, including the 2.4 GHz and 5 GHz bands that are currently used by Wi-Fi, Zigbee and some other communication systems. In this article, we look into the coexistence of…
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