多小区无线网络中的自适应空间小区间干扰消除
Adaptive Spatial Intercell Interference Cancellation in Multicell Wireless Networks
摘要：
下行链路空间小区间干扰消除（ICIC）被考虑用于使用多个发射天线来减轻其它小区干扰。我们探讨的一个原则问题是，ICIC还是简单的标准单小区波束成形更好。我们探讨这个问题的分析，并表明，波束成形是首选的边缘SNR（信噪比）时，所有用户低（$<0$ dB），和ICIC是首选的边缘SNR高（$>10$ dB）时，例如在城市设置。在中等SNR，建议的自适应策略，其中多个基站联合选择基于用户位置的传输策略，优于两者，同时需要比纯ICIC方法更低的反馈速率。所采用的度量是总和速率，这通常是一个可疑的度量蜂窝系统，但令人惊讶的是，我们表明，即使有这个奖励功能的自适应策略也提高了公平性。当信道信息由有限反馈提供时，还研究了引起的量化误差的影响。结果表明，ICIC与精心设计的反馈策略仍然提供了显着的吞吐量增益。
英文摘要：
Downlink spatial intercell interference cancellation (ICIC) is considered for mitigating other-cell interference using multiple transmit antennas. A principle question we explore is whether it is better to do ICIC or simply standard single-cell beamforming. We explore this question analytically and show that beamforming is preferred for all users when the edge SNR (signal-to-noise ratio) is low ($<0$ dB), and ICIC is preferred when the edge SNR is high ($>10$ dB), for example in an urban setting. At medium SNR, a proposed adaptive strategy, where multiple base stations jointly select transmission strategies based on the user location, outperforms both while requiring a lower feedback rate than the pure ICIC approach. The employed metric is sum rate, which is normally a dubious metric for cellular systems, but surprisingly we show that even with this reward function the adaptive strategy also improves fairness. When the channel information is provided by limited feedback, the impact of the induced quantization error is also investigated. It is shown that ICIC with well-designed feedback strategies still provides significant throughput gain.
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