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Multi-Cell Interference Exploitation: Enhancing the Power Efficiency in Cell Coordination
IEEE Transactions on Wireless Communications ( IF 10.4 ) Pub Date : 2020-01-01 , DOI: 10.1109/twc.2019.2946818
Zhongxiang Wei , Christos Masouros , Kai-Kit Wong , Xin Kang

In this paper, we propose a series of novel coordination schemes for multi-cell downlink communication. Starting from full base station (BS) coordination, we first propose a fully-coordinated scheme to exploit beneficial effects of both inter-cell and intra-cell interference, based on sharing both channel state information (CSI) and data among the BSs. To reduce the coordination overhead, we then propose a partially-coordinated scheme where only intra-cell interference is designed to be constructive while inter-cell is jointly suppressed by the coordinated BSs. Accordingly, the coordination only involves CSI exchange and the need for sharing data is eliminated. To further reduce the coordination overhead, a third scheme is proposed, which only requires the knowledge of statistical inter-cell channels, at the cost of a slight increase on the transmission power. For all the proposed schemes, imperfect CSI is considered. We minimize the total transmission power in terms of probabilistic and deterministic optimizations. Explicitly, the former statistically satisfies the users’ signal-to-interference-plus-noise ratio (SINR) while the latter guarantees the SINR requirements in the worst case CSI uncertainties. Simulation verifies that our schemes consume much lower power compared to the existing benchmarks, i.e., coordinated multi-point (CoMP) and coordinated-beamforming (CBF) systems, opening a new dimension on multi-cell coordination.

中文翻译:

多小区干扰利用:提高小区协调的功率效率

在本文中,我们为多小区下行链路通信提出了一系列新颖的协调方案。从全基站 (BS) 协调开始,我们首先提出了一种全协调方案,以在 BS 之间共享信道状态信息 (CSI) 和数据的基础上,利用小区间和小区间干扰的有益效果。为了减少协调开销,我们然后提出了一种部分协调的方案,其中只有小区间干扰被设计为建设性的,而小区间被协调的基站联合抑制。因此,协调仅涉及CSI交换并且消除了共享数据的需要。为了进一步减少协调开销,提出了第三种方案,它只需要统计小区间信道的知识,以传输功率略有增加为代价。对于所有提出的方案,都考虑了不完美的 CSI。我们根据概率和确定性优化来最小化总传输功率。明确地说,前者在统计上满足用户的信干噪比(SINR),而后者保证在最坏情况下 CSI 不确定性下的 SINR 要求。仿真验证了我们的方案与现有基准(即协调多点 (CoMP) 和协调波束成形 (CBF) 系统)相比消耗的功率要低得多,从而开启了多小区协调的新维度。前者在统计上满足用户的信干噪比(SINR),而后者保证在最坏情况下CSI不确定性下的SINR要求。仿真验证了我们的方案与现有基准(即协调多点 (CoMP) 和协调波束成形 (CBF) 系统)相比消耗的功率要低得多,从而开启了多小区协调的新维度。前者在统计上满足用户的信干噪比(SINR),而后者保证在最坏情况下CSI不确定性下的SINR要求。仿真验证了我们的方案与现有基准(即协调多点 (CoMP) 和协调波束成形 (CBF) 系统)相比消耗的功率要低得多,从而开启了多小区协调的新维度。
更新日期:2020-01-01
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