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http://dx.doi.org/10.7840/kics.2016.41.11.1387

A Cognitive Beamforming Scheme for Cross-Tier Interference Mitigation in Heterogeneous Cellular Networks  

Seo, Ju-yeol (Division of Electrical and Electronic Engineering, College of Information Technology, Kangwon National University)
Park, Seungyoung (Division of Electrical and Electronic Engineering, College of Information Technology, Kangwon National University)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.41, no.11, 2016 , pp. 1387-1401 More about this Journal
Abstract
When a closed access policy in which only an authorized user is allowed to access to a given base station (BS) has been employed in heterogeneous cellular networks, a macro-cell user is used to experience strong cross-tier interference from its adjacent small-cell BSs to which the user is not allowed to access. To mitigate this problem, it has been proposed that a small-cell BS employs a beamforming vector which is orthogonal to the channel of the victim user. However, this technique requires considerable mutual exchange of information among the macro-cell BS, the macro-cell user, and the small-cell BS. In this paper, we propose a cognitive beamforming scheme, in which a small-cell BS employs the beamforming orthogonal to the victim users' channel without any explicit mutual information exchange. Particularly, the small-cell BS finds small- and macro-cell users experiencing the co-tier and cross-tier interferences from it, respectively. Then, it employs a beamforming which is orthogonal to the victim users' channels to mitigate the co-tier and cross-tier interferences. Using the system-level simulation, we demonstrate that the proposed scheme effectively mitigates the cross-tier interference problem.
Keywords
cognitive beamforming; cross-tier interference; co-tier interference; interference mitigation; dual-stripe apartment model; heterogeneous cellular networks;
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Times Cited By KSCI : 4  (Citation Analysis)
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