On Providing Downlink Services in Collocated Spectrum-Sharing Macro and Femto Networks
On Providing Downlink Services in Collocated Spectrum-Sharing Macro and Femto Networks
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DOI：
10.1109/twc.2011.101511.110237
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发表时间：
2011-10
影响因子：
10.4
通讯作者：
Xiaoli Chu;Yuhua Wu;D. López-Pérez;Xiaofeng Tao
中科院分区：
文献类型：
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作者：
Xiaoli Chu;Yuhua Wu;D. López-Pérez;Xiaofeng Tao
毫微微蜂窝基站已被无线行业视为一种经济高效的解决方案，不仅可以改善室内服务提供，还可以减轻已经不堪重负的宏网络的流量。由于频谱可用性和网络基础设施的考虑，宏网络可能必须与重叠的毫微微蜂窝基站共享频谱。在频谱共享的宏和毫微微网络中，由宏蜂窝基站（MBS）和毫微微蜂窝接入点（FAP）的不同传输功率引起的小区间干扰，再加上可能密集部署的毫微微蜂窝，可能会产生死点，无法向宏或毫微微用户保证可靠的服务。在本文中，基于对基于并置频谱共享正交频分多址（OFDMA）的宏和毫微微网络的下行链路（DL）中断概率（OP）的全面分析，我们为FAP设计了一种分散策略，以根据其与最近MBS的距离来自我调节其传输功率水平和无线电资源的使用。仿真结果表明，导出的 DL OP 的封闭式下界是严格的，并且所提出的分散式 femtocell 自调节策略能够保证目标宏和 femto 服务区域中可靠的 DL 服务，同时提供卓越的空间复用性，即使每个小区站点部署大量频谱共享 femtocell。
Femtocells have been considered by the wireless industry as a cost-effective solution not only to improve indoor service providing, but also to unload traffic from already overburdened macro networks. Due to spectrum availability and network infrastructure considerations, a macro network may have to share spectrum with overlaid femtocells. In spectrum-sharing macro and femto networks, inter-cell interference caused by different transmission powers of macrocell base stations (MBSs) and femtocell access points (FAPs), in conjunction with potentially densely deployed femtocells, may create dead spots where reliable services cannot be guaranteed to either macro or femto users. In this paper, based on a thorough analysis of downlink (DL) outage probabilities (OPs) of collocated spectrum-sharing orthogonal frequency division multiple access (OFDMA) based macro and femto networks, we devise a decentralized strategy for an FAP to self-regulate its transmission power level and usage of radio resources depending on its distance from the closest MBS. Simulation results show that the derived closed-form lower bounds of DL OPs are tight, and the proposed decentralized femtocell self-regulation strategy is able to guarantee reliable DL services in targeted macro and femto service areas while providing superior spatial reuse, for even a large number of spectrum-sharing femtocells deployed per cell site.