Optimality Properties and Low-Complexity Solutions to Coordinated Multicell Transmission
Optimality Properties and Low-Complexity Solutions to Coordinated Multicell Transmission
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DOI：
10.1109/glocom.2010.5683353
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发表时间：
2010-12
期刊：
影响因子：
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通讯作者：
Emil Björnson;M. Bengtsson;B. Ottersten
中科院分区：
文献类型：
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作者：
Emil Björnson;M. Bengtsson;B. Ottersten
基站协作通过多个基站协调干扰和服务小区边缘终端，理论上可以提高多小区系统的吞吐量。在实践中，协作的程度受到回程信令和计算需求的增加的限制。为了解决这些问题，我们提出了一种新的分布式合作结构，每个基站有责任对一组终端的干扰，而只为他们的一个子集的数据。考虑了加权和速率最大化问题，利用拉格朗日对偶理论推导了波束形成最优性条件和最优传输结构。这导致分布式低复杂度的传输策略，在一个典型的城市多小区环境中测量的多天线信道进行评估。
Base station cooperation can theoretically improve the throughput of multicell systems by coordinating interference and serving cell edge terminals through multiple base stations. In practice, the extent of cooperation is limited by the increase in backhaul signaling and computational demands. To address these concerns, we propose a novel distributed cooperation structure where each base station has responsibility for the interference towards a set of terminals, while only serving a subset of them with data. Weighted sum rate maximization is considered, and conditions for beamforming optimality and the optimal transmission structure are derived using Lagrange duality theory. This leads to distributed low-complexity transmission strategies, which are evaluated on measured multiantenna channels in a typical urban multicell environment.