MINE GOLD提供绿色认知通信
MINE GOLD to Deliver Green Cognitive Communications
摘要：
基于地理位置数据库的电视白空间网络减少了对频谱感知等高能耗过程的需求，可以有效实现绿色认知通信。这样一个网络的成功依赖于一个适当的商业模式，为所有参与方提供激励。在本文中，我们提出了MINE GOLD（一个模型的信息markEt的地理位置数据库），它使数据库出售频谱信息的非授权白色空间设备（WSDs）的利润。具体而言，我们专注于一个寡头垄断的信息市场与多个数据库，并研究数据库和WSDs之间的相互作用，使用一个两阶段的层次模型。在第一阶段，数据库通过优化它们的信息价格来竞争向WSD出售信息。在第二阶段，各水务署决定是否及从哪个数据库购买有关资料，以尽量利用电视空白空间。我们首先从数据库中描述了WSDs的购买行为是如何动态演变的，以及在固定信息价格下的均衡点是什么。然后分析了系统参数和数据库定价决策对市场均衡的影响，以及数据库价格竞争的均衡是什么。我们的数值结果表明，也许与直觉相反，数据库的总收入与数据库的数量并不单调。此外，数值结果表明，很大程度的正网络外部性将提高数据库的收入和系统性能。
英文摘要：
Geo-location database-assisted TV white space network reduces the need of energy-intensive processes (such as spectrum sensing), hence can achieve green cognitive communication effectively. The success of such a network relies on a proper business model that provides incentives for all parties involved. In this paper, we propose MINE GOLD (a Model of INformation markEt for GeO-Location Database), which enables databases to sell the spectrum information to unlicensed white space devices (WSDs) for profit. Specifically, we focus on an oligopoly information market with multiple databases, and study the interactions among databases and WSDs using a two-stage hierarchical model. In Stage I, databases compete to sell information to WSDs by optimizing their information prices. In Stage II, each WSD decides whether and from which database to purchase the information, to maximize his benefit of using the TV white space. We first characterize how the WSDs' purchasing behaviors dynamically evolve, and what is the equilibrium point under fixed information prices from the databases. We then analyze how the system parameters and the databases' pricing decisions affect the market equilibrium, and what is the equilibrium of the database price competition. Our numerical results show that, perhaps counter-intuitively, the databases' aggregate revenue is not monotonic with the number of databases. Moreover, numerical results show that a large degree of positive network externality would improve the databases' revenues and the system performance.
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