Bandwidth exchange: an energy conserving incentive mechanism for cooperation
Bandwidth exchange: an energy conserving incentive mechanism for cooperation
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DOI：
10.1109/twc.2010.06.091263
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发表时间：
2010-06
影响因子：
10.4
通讯作者：
Dan Zhang;R. Shinkuma;N. Mandayam
中科院分区：
文献类型：
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作者：
Dan Zhang;R. Shinkuma;N. Mandayam
无线网络中的协作转发可以获得速率和分集增益，但会产生由协作节点承担的能量成本。在本文中，我们考虑了一种激励机制，称为带宽交换（BE）的节点灵活地交换传输带宽作为一种手段，提供激励转发数据，而不增加所需的总带宽或总发射功率。认知无线电和多载波系统（如正交频分多址接入（OFDMA））的出现使得这种方法与通常基于抽象的信用概念和共享价值理解的其他激励机制相比特别有吸引力。机制来研究BE在速率和覆盖增益方面的好处。我们还提出了两种基于简单概率规则的启发式转发算法，并研究了这些方法在性能方面的权衡。我们的研究结果表明，基于带宽交换的转发可以提供至少3dB的OFDMA网络中的传输功率节省相比，非合作。
Cooperative forwarding in wireless networks has shown to yield rate and diversity gains, but it incurs energy costs borne by the cooperating nodes. In this paper we consider an incentive mechanism called Bandwidth Exchange (BE) where the nodes flexibly exchange the transmission bandwidth as a means of providing incentive for forwarding data, without increasing either the total bandwidth required or the total transmit power. The advent of cognitive radios and multicarrier systems such as Orthogonal Frequency Division Multiple Access (OFDMA) with the ability to flexibly delegate and employ a number of subcarriers makes this approach particularly appealing compared to other incentive mechanisms that are often based on abstract notions of credit and shared understanding of worth.We consider a N-node wireless network over a fading channel and use a Nash Bargaining Solution (NBS) mechanism to study the benefits of BE in terms of rate and coverage gains.We also propose two heuristic algorithms based on simple probabilistic rules for forwarding and study the tradeoffs in terms of performance among these approaches. Our results reveal that bandwidth exchange based forwarding can provide transmit power savings in OFDMA networks of at least 3dB compared to noncooperation.