Downlink Interference Mitigation Scheme for Two-tier OFDMA Cellular Networks
BibTeX
@MISC{Han_downlinkinterference,
author = {Jonghun Han and Saewoong Bahk},
title = {Downlink Interference Mitigation Scheme for Two-tier OFDMA Cellular Networks},
year = {}
}
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Abstract
Abstract—In a two-tier cellular network, macrocells and fem-tocells coexist. Since femtocells use low transmission power and share network resources with macrocells, they are considered as one of the promising solutions to highly congested network environments. However, since femtocells are deployed in a self-organized manner without cell-planning, they cause severe down-link interference to macro users. Therefore, this paper focuses on the interference problem of macro users caused by femtocells, so-called the coverage hole problem. Our scheme enables femtocells to cooperate with macrocell users through using the proposed uplink signaling subchan-nel (USS) and resource usage detection procedure (RUDP). It controls femtocells to adjust the amount of their resource usage adaptively, thereby clearing the downlink resources for interfered macro users. Through simple analysis and simulations, we confirm that our scheme outperforms the conventional power control scheme in terms of downlink achievable rate. I.
Keyphrases
downlink interference mitigation scheme two-tier ofdma cellular network two-tier cellular network share network resource coverage hole problem promising solution downlink achievable rate interference problem conventional power control scheme low transmission power resource usage detection procedure self-organized manner congested network environment interfered macro user macrocell user downlink resource simple analysis resource usage fem-tocells coexist severe down-link interference macro user
