Joint User Association and Interference Coordination in Heterogeneous Cellular Networks
Joint User Association and Interference Coordination in Heterogeneous Cellular Networks
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DOI：
10.1109/lcomm.2013.102113.131836
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发表时间：
2013-10
期刊：
影响因子：
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通讯作者：
Yinghao Jin;Ling Qiu
中科院分区：
文献类型：
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作者：
Yinghao Jin;Ling Qiu
在这封信中，考虑了异构蜂窝网络中的用户关联问题以及基于几乎空白子帧（ABSF）的干扰协调（IC）技术。首先，我们将组合优化问题表述为网络范围效用最大化问题，其解决方案是 NP 困难的。幸运的是，我们发现最佳的ABSF密度是脆弱用户数量与总用户的比率。基于这种关系，原始问题被简化为纯粹的最优用户关联问题。然后，我们针对重新表述的问题提出了一种基于边际效用的用户关联算法。仿真结果显示了我们提出的方案的效率。
In this letter, the user association problem in conjunction with almost blank subframe (ABSF) based interference coordination (IC) technique is considered in heterogeneous cellular networks. First, we formulate the combinatorial optimization problem as a network-wide utility maximization problem, whose solution is NP-hard. Fortunately, we reveal that the optimal ABSF density is the ratio of the number of vulnerable users and total users. Based on this relationship, the original problem is reduced to a pure optimal user association problem. Then, we propose a marginal utility based user association algorithm for the reformulated problem. Simulation results show the efficiency of our proposed scheme.