Spectrum leasing to cooperating secondary ad hoc networks
Spectrum leasing to cooperating secondary ad hoc networks
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DOI：
10.1109/jsac.2008.080118
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发表时间：
2008-01-01
影响因子：
16.4
通讯作者：
Pickholtz, R.
中科院分区：
文献类型：
--
作者：
Simeone, O.;Stanojev, I.;Pickholtz, R.
认知无线电（或二次频谱接入）的概念目前作为一种有前景的范例正在被研究，它通过允许授权（主）用户和非授权（次）用户在同一带宽中共存来实现频率资源的高效利用。根据认知无线电的产权模型，主终端拥有给定的带宽，并可能决定将其在一部分时间内出租给次节点以换取适当的报酬。在本文中，我们提出并分析了这一框架的一种实现方式，即主链路有可能将其拥有的频谱出租给一个由次节点组成的自组织网络，以换取分布式空时编码形式的合作。一方面，主链路试图在速率或中断概率方面最大化其服务质量，同时考虑合作可能带来的贡献。另一方面，二次自组织网络中的节点根据分布式功率控制机制在租用的时隙内相互竞争进行传输。所研究的模型被方便地置于斯塔克尔伯格博弈的框架内。我们既考虑了具有完全信道状态信息和信息论传输策略的基准场景，也考虑了具有长期信道状态信息和随机分布式空时编码的更实用模型。分析和数值结果表明，基于以二次频谱接入换取合作的频谱租赁是认知无线电的一个有前景的框架。
The concept of cognitive radio (or secondary spectrum access) is currently under investigation as a promising paradigm to achieve efficient use of the frequency resource by allowing the coexistence of licensed (primary) and unlicensed (secondary) users in the same bandwidth. According to the property-rights model of cognitive radio, the primary terminals own a given bandwidth and may decide to lease it for a fraction of time to secondary nodes in exchange for appropriate remuneration. In this paper, we propose and analyze an implementation of this framework, whereby a primary link has the possibility to lease the owned spectrum to an ad hoc network of secondary nodes in exchange for cooperation in the form of distributed space-time coding. On one hand, the primary link attempts to maximize its quality of service in terms of either rate or probability of outage, accounting for the possible contribution from cooperation. On the other hand, nodes in the secondary ad hoc network compete among themselves for transmission within the leased time-slot following a distributed power control mechanism. The investigated model is conveniently cast in the framework of Stackelberg games. We consider both a baseline scenario with full channel state information and information-theoretic transmission strategies, and a more practical model with long-term channel state information and randomized distributed space-time coding. Analysis and numerical results show that spectrum leasing based on trading secondary spectrum access for cooperation is a promising framework for cognitive radio.