A power-efficient coverage scheme for cell-edge users using cognitive beamforming

Zarrebini-Esfahani, Azar, Le, Tuan Anh ORCID: https://orcid.org/0000-0003-0612-3717 and Nakhai, Mohammad Reza (2013) A power-efficient coverage scheme for cell-edge users using cognitive beamforming. IEEE 24th International Symposium on Personal Indoor and Mobile Radio Communications (PIMRC), 2013 . pp. 3028-3032. ISSN 2166-9570 [Article] (doi:10.1109/PIMRC.2013.6666666)

Abstract

This paper addresses the problem of strong intercell interference on cell-edge users in conventional cellular networks by deploying cognitive cells within the vicinity of primary cell borders. The cognitive base stations serve primary cell-edge users within the cognitive cells. In return, the cognitive base stations are rewarded by the same spectrum allocated to the primary base stations to serve secondary users. We propose a strategy that is formulated as an optimization problem for the cognitive cell to minimize the total transmit power of the cognitive base station. This optimization problem is subjected to maintain a controlled level of interference at the primary outer-cell users falling outside of the cognitive cell and to assure required levels of signal-to-noise-plus-interference-ratio (SINR) at all primary cell-edge and secondary users within the cognitive cell. Simulation results confirm that the beamforming scheme in conjunction with the proposed cognitive structure lead to a significant reduction in overall power transmitted in the network.

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