이종 셀룰러 네트워크에서 계층간 협력 통신을 고려하는 사용자 접속 기법
A User Association Technique Considering Cooperative Transmissions in Heterogeneous Cellular Networks
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초록
본 논문에서는 이종 셀룰러 네트워크의 하향링크에서 사용자들의 비례공평성을 최대화하는 계층간 협력 통신을 고려한 사용자 접속 기법을 제안한다. 이를 위해 계층간 협력 통신을 통해 서비스를 받는“계층간 사용자”를 소개하고이를 고려한 사용자간의 공평성을 최대화하는 펨토셀 자기 구성 문제를 정의한다. 하지만 이 문제에 대해 직접적으로푸는 것은 어려울 뿐만 아니라 가능한 모든 경우에 대해 광범위한 조사를 해야하므로 앞서 정의된 문제를 근사화한 사용자 접속 기법을 제안한다. 모의실험을 통해 최대 수신전력을 기반으로 사용자 접속을 하는 기존 기법보다 제안하는사용자 접속 기법을 통해 사용자 간의 비례공평성이 훨씬 더 좋아지는 것을 확인하였다.
Abstract
In this paper, we propose a user association scheme considering a cooperative communication in downlink for heterogeneous cellular networks. A ''cross-tier'' user associated with both a macro-cell and a femto-cell is defined as a cross-tier coordination method between the macro- and femto-cells. Considering the cross-tier coordination for mitigating cross-tier interference, a self-organization problem for femto-cells is formulated to maximize fairness among users. However, it is intractable to directly solve the problem and the formulated problem requires extensive search space for all possible scenarios. Instead, we approximate the original problem and propose a user association algorithm. From Monte-carlo simulation, it is shown that the proposed scheme can improve fairness among users compared to conventional schemes.
참고문헌 (17)
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