Contract-Based Interference Coordination in Heterogeneous Cloud Radio Access Networks
Contract-Based Interference Coordination in Heterogeneous Cloud Radio Access Networks
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DOI：
10.1109/jsac.2015.2416985
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发表时间：
2015-03
影响因子：
16.4
通讯作者：
M. Peng;Xinqian Xie;Q. Hu;Jie Zhang;H. Poor
中科院分区：
文献类型：
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作者：
M. Peng;Xinqian Xie;Q. Hu;Jie Zhang;H. Poor
异构云无线电接入网络（H-CRAN）是通过将云计算嵌入异构网络来提高频谱和能量效率的潜在解决方案。远程无线头端（RRH）之间的干扰可以通过基带单元（BBU）池中的集中式协作处理来抑制，而RRH与宏基站（MBS）之间的层间干扰在H-CRAN中仍然是具有挑战性的。为了减轻这种层间干扰，本文提出了一种基于合同的干扰协调框架，该框架包含三种调度方案，并将下行链路传输间隔相应地分为三个阶段。该框架的核心思想是选择覆盖所有RRH的BBU池作为向MBS提供合同的委托人，MBS作为代理人根据个人理性约束决定是否接受合同。当委托人和代理人都获得了完美的信道状态信息（CSI）时，最大化基于速率的效用的最优合同设计。此外，合同优化的情况下，只有部分CSI可以从实际的信道估计，以及解决。蒙特卡洛仿真验证了分析结果，仿真结果表明，所提出的框架可以显著提高传输数据速率，从而证明了基于合同的解决方案的有效性。
Heterogeneous cloud radio access networks (H-CRANs) are potential solutions for improving both spectral and energy efficiencies by embedding cloud computing into heterogeneous networks. The interference among remote radio heads (RRHs) can be suppressed with centralized cooperative processing in the base band unit (BBU) pool, while the inter-tier interference between RRHs and macro base stations (MBSs) is still challenging in H-CRANs. In this paper, to mitigate this inter-tier interference, a contract-based interference coordination framework is proposed, in which three scheduling schemes are involved, and the downlink transmission interval is divided into three phases accordingly. The core idea of the proposed framework is that the BBU pool covering all RRHs is selected as the principal that would offer a contract to the MBS, and the MBS as the agent decides whether to accept the contract or not according to an individual rational constraint. An optimal contract design that maximizes the rate-based utility is derived when perfect channel state information (CSI) is acquired at both principal and agent. Furthermore, contract optimization under the situation in which only partial CSI can be obtained from practical channel estimation is addressed as well. Monte Carlo simulations are provided to confirm the analysis, and simulation results show that the proposed framework can significantly increase the transmission data rates over baselines, thus demonstrating the effectiveness of the proposed contract-based solution.