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arXiv 1105.0738cs.NI
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REFIM:一种实用的异构无线接入网干扰管理方案

REFIM: A Practical Interference Management in Heterogeneous Wireless Access Networks

Kyuho Son, Soohwan Lee, Yung Yi, Song Chong

摘要:

由于无线蜂窝网络中容量需求的增加,诸如微微小区和毫微微小区的小型小区变得越来越流行以享受空间重用增益,因此期望具有不同大小的小区以复杂的方式共存。在这样的异构环境中,干扰管理(IM)的作用变得更加重要,但是技术挑战也增加,因为遭受来自相邻小区的严重干扰的小区边缘用户的数量将自然增长。为了克服现有的静态和其他动态IM算法的低性能和/或高复杂度,我们提出了一种新的低复杂度和完全分布式的IM方案,称为RESISTANCE,在异构多小区网络的下行链路。我们首先制定一个一般的优化问题,原来需要棘手的计算复杂性的全局最优性。为了获得具有低计算和信令开销的实用解决方案,这对于低成本小小区解决方案至关重要,例如,对于毫微微小区,在REESTA中,我们基于参考用户的概念将其分解为每个BS的问题,并在时间和空间上减少回程上的反馈开销。我们通过各种配置下的广泛模拟来评估REESTING,包括实际部署BS的场景。我们发现,相比于没有IM的方案,REESTING可以产生超过40%的小区边缘用户的吞吐量提高,同时提高10~ 107%的整体性能。这等于现有集中式IM算法的大约95%的性能,已知现有集中式IM算法是接近最优的,但是由于过高的复杂性而难以在实践中实现。我们还提出,只要干扰管理良好,频谱共享政策可以优于最佳的频谱分割政策,其中子信道的数量是最佳的宏和毫微微小区之间划分。

英文摘要:

Due to the increasing demand of capacity in wireless cellular networks, the small cells such as pico and femto cells are becoming more popular to enjoy a spatial reuse gain, and thus cells with different sizes are expected to coexist in a complex manner. In such a heterogeneous environment, the role of interference management (IM) becomes of more importance, but technical challenges also increase, since the number of cell-edge users, suffering from severe interference from the neighboring cells, will naturally grow. In order to overcome low performance and/or high complexity of existing static and other dynamic IM algorithms, we propose a novel low-complex and fully distributed IM scheme, called REFIM, in the downlink of heterogeneous multi-cell networks. We first formulate a general optimization problem that turns out to require intractable computation complexity for global optimality. To have a practical solution with low computational and signaling overhead, which is crucial for low-cost small-cell solutions, e.g., femto cells, in REFIM, we decompose it into per-BS problems based on the notion of reference user and reduce feedback overhead over backhauls both temporally and spatially. We evaluate REFIM through extensive simulations under various configurations, including the scenarios from a real deployment of BSs. We show that, compared to the schemes without IM, REFIM can yield more than 40% throughput improvement of cell-edge users while increasing the overall performance by 10~107%. This is equal to about 95% performance of the existing centralized IM algorithm that is known to be near-optimal but hard to implement in practice due to prohibitive complexity. We also present that as long as interference is managed well, the spectrum sharing policy can outperform the best spectrum splitting policy where the number of subchannels is optimally divided between macro and femto cells.

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