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Coexistence of Wi-Fi and heterogeneous small cell networks sharing unlicensed spectrum
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Zhang, Haijun, Chu, Xiaoli, Guo, Weisi and Wang, Siyi (2015) Coexistence of Wi-Fi and heterogeneous small cell networks sharing unlicensed spectrum. IEEE Communications Magazine, Volume 53 (Number 3). pp. 158-164. doi:10.1109/MCOM.2015.7060498 ISSN 0163-6804.
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Official URL: http://dx.doi.org/10.1109/MCOM.2015.7060498
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 Wi-Fi and 4G cellular networks sharing the unlicensed spectrum. We introduce a network architecture where small cells use the same unlicensed spectrum that Wi-Fi systems operate in without affecting the performance of Wi-Fi systems. We present an almost blank subframe (ABS) scheme without priority to mitigate the co-channel interference from small cells to Wi-Fi systems, and propose an interference avoidance scheme based on small cells estimating the density of nearby Wi-Fi access points to facilitate their coexistence while sharing the same unlicensed spectrum. Simulation results show that the proposed network architecture and interference avoidance schemes can significantly increase the capacity of 4G heterogeneous cellular networks while maintaining the service quality of Wi-Fi systems.
Item Type: | Journal Article | ||||
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Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||
Library of Congress Subject Headings (LCSH): | Mobile communication systems, Wireless LANs | ||||
Journal or Publication Title: | IEEE Communications Magazine | ||||
Publisher: | IEEE | ||||
ISSN: | 0163-6804 | ||||
Official Date: | March 2015 | ||||
Dates: |
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Volume: | Volume 53 | ||||
Number: | Number 3 | ||||
Page Range: | pp. 158-164 | ||||
DOI: | 10.1109/MCOM.2015.7060498 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Date of first compliant deposit: | 29 December 2015 | ||||
Date of first compliant Open Access: | 29 December 2015 | ||||
Funder: | Guo jia zi ran ke xue ji jin wei yuan hui (China) [National Natural Science Foundation of China] (NSFC), China. Fundamental Research Funds for the Central Universities (FRFCU), Beijing University of Chemical Technology | ||||
Grant number: | 61471025 (NSFC), No. ZY1426 (FRFCU) |
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