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arXiv 1102.4176cs.NI
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基于契约的协作频谱共享

Contract-Based Cooperative Spectrum Sharing

Lingjie Duan, Lin Gao, Jianwei Huang

摘要:

提供适当的经济激励对于动态频谱共享的成功至关重要。合作频谱共享是实现这一目标的有效途径之一。在协作频谱共享中,次要用户(SU)中继主要用户(PU)的业务,以换取用于SU自己的通信需求的专用传输时间。本文研究了不完全信息下的协作频谱共享问题,其中SU的类型(中继信道增益和功耗评估)是私有信息,不为PU所知。受契约理论的启发,我们将网络建模为劳动力市场。单一的PU是向SU提供合同的雇主。该合同由一组合同项组成,这些合同项表示频谱接入时间(即,奖励)和中继功率(即,贡献)。SU是雇员,他们每个人都选择最好的合同项目来最大化他的收益。我们研究了弱和强不完全信息情形下的最优契约设计。首先,我们为两种情形下的可行契约提供了充分必要条件。在弱不完全信息的情况下,我们进一步推导出最优的合同,达到相同的最大PU的效用在完全信息基准。在强不完全信息的情况下,我们提出了一个分解和比较算法,实现了接近最优的合同。我们的未来表明,PU的平均效用损失由于次优算法和强大的不完全信息都相对较小(小于2%和1:3%,分别在我们的数值结果与两个SU类型)。

英文摘要:

Providing proper economic incentives is essential for the success of dynamic spectrum sharing. Cooperative spectrum sharing is one effective way to achieve this goal. In cooperative spectrum sharing, secondary users (SUs) relay traffics for primary users (PUs), in exchange for dedicated transmission time for the SUs' own communication needs. In this paper, we study the cooperative spectrum sharing under incomplete information, where SUs' types (capturing their heterogeneity in relay channel gains and evaluations of power consumptions) are private information and not known by PUs. Inspired by the contract theory, we model the network as a labor market. The single PU is the employer who offers a contract to the SUs. The contract consists of a set of contract items representing combinations of spectrum accessing time (i.e., reward) and relaying power (i.e., contribution). The SUs are employees, and each of them selects the best contract item to maximize his payoff. We study the optimal contract design for both weak and strong incomplete information scenarios. First, we provide necessary and sufficient conditions for feasible contracts in both scenarios. In the weak incomplete information scenario, we further derive the optimal contract that achieves the same maximum PU's utility as in the complete information benchmark. In the strong incomplete information scenario, we propose a Decompose-and-Compare algorithm that achieves a close-to-optimal contract. We future show that the PU's average utility loss due to the suboptimal algorithm and the strong incomplete information are both relatively small (less than 2% and 1:3%, respectively, in our numerical results with two SU types).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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