NDLI: Channel assignment and opportunistic spectrum access in two-tier cellular networks with cognitive small cells

Content Provider	IEEE Xplore Digital Library
Author	ElSawy, H. Hossain, E.
Copyright Year	2013
Abstract	Cognitive small cells using opportunistic spectrum access (OSA) are envisioned to be a key technology for future generation multi-tier cellular wireless networks. In a multi-tier cellular network with universal frequency reuse, macrocell users may suffer performance degradation due to inter-tier interference caused by closed-access small cells. On the other hand, when the traffic load served by the macro network tier is high, the OSA performance of the small cells will be poor. However, similar to that for the macrocell users, the quality-of-service (QoS) performance of the small cell users need to be guaranteed. Therefore, efficient channel sharing mechanisms need to be developed for macrocell and small cell users. In this paper, we investigate on two extremal channel assignment techniques, namely, the random channel assignment (RCA) and the sequential channel assignment (SCA) techniques in the macro tier in order to accommodate the overlaid cognitive small cells with an acceptable OSA performance. We show that, for downlink transmission, while the RCA scheme offers a low intra-tier interference for macro users, it results in a degraded OSA performance (in terms of probability of successful channel access) for the small cells. On the other hand, the SCA scheme enhances the OSA performance of the small cells at the expense of increased intra-tier interference for macro users. To quantify the performance gain achieved due to OSA by the small cells for these two channel assignment schemes, we compare the coverage probability of a generic macro user when the small cells are cognitive and when the small cells aggressively use the spectrum.
Sponsorship	IEEE Commun. Soc.
Starting Page	4477
Ending Page	4482
File Size	281421
Page Count	6
File Format	PDF
ISBN	9781479913534
DOI	10.1109/GLOCOMW.2013.6855656
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-12-09
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Interference Scattering Channel allocation Sensors Signal to noise ratio Probability Aggregates stochastic geometry Multi-tier cellular networks cognitive small cells opportunistic spectrum access
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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