Adaptive base station cooperation and subchannel reallocation at cell edge in cellular networks with fractional frequency reuse
Adaptive base station cooperation and subchannel reallocation at cell edge in cellular networks with fractional frequency reuse
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DOI：
10.1109/pimrc.2009.5449799
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发表时间：
2009-09
期刊：
影响因子：
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通讯作者：
Liang Xu;Koji Yamamoto;H. Murata;S. Yoshida
中科院分区：
文献类型：
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作者：
Liang Xu;Koji Yamamoto;H. Murata;S. Yoshida
本文主要研究了基站协作技术在分数频率复用（FFR）网络中的应用。在WiMAX等OFDMA蜂窝系统中，相邻小区的边缘移动站（MSs）使用不同的子信道进行分离传输，分数频率复用被认为是一种很有前途的避免小区间干扰问题的方案。但是，FFR的问题是小区边缘频谱效率（SE）比小区中心低得多。BSC技术利用相邻BSs对同一信道的一个小区边缘MS进行协同传输，可以提高小区边缘SE。然而，由于一个小区的边缘MS有更多的BSs传输信号，使用BSC也会增加小区间的干扰，这可能会降低网络性能。在本文中，重点关注这种权衡，我们提出了一种自适应平衡计分卡方案，其中平衡计分卡仅对细胞边缘MSs执行，该方案可以实现显着的容量增加，而细胞间干扰仅略有增加。为了进一步提高自适应平衡计分卡方案的性能，提出了一种信道重分配方案。仿真结果表明，与传统的FFR方案相比，所提方案能有效提高FFR网络的性能。
The present paper focuses the application of the base station cooperation (BSC) technique in fractional frequency reuse (FFR) networks. Fractional frequency reuse is considered to be a promising scheme for avoiding the inter-cell interference problem in OFDMA cellular systems, such as WiMAX, in which the edge mobile stations (MSs) of adjacent cells use different subchannels for separate transmission. However, the problem of FFR is that the cell edge spectral efficiency (SE) is much lower compared to that of the cell center. The BSC technique, in which adjacent BSs perform cooperative transmission for one cell edge MS with the same channel, may improve the cell edge SE. However, since more BSs transmit signals for one cell edge MS, the use of BSC can also increase the inter-cell interference, which might degrade the network performance. In the present paper, with a focus on this tradeoff, we propose an adaptive BSC scheme in which BSC is only performed for the cell edge MSs that can achieve a significant capacity increase with only a slight increase in inter-cell interference. Moreover, a channel reallocation scheme is proposed in order to further improve the performance of the adaptive BSC scheme. The simulation results reveal that, compared to the conventional FFR scheme, the proposed schemes are effective for improving the performance of FFR networks.