Joint Spectrum and Power Allocation for Inter-Cell Spectrum Sharing in Cognitive Radio Networks
Joint Spectrum and Power Allocation for Inter-Cell Spectrum Sharing in Cognitive Radio Networks
复制标题
DOI：
10.1109/dyspan.2008.36
复制
发表时间：
2008-10
期刊：
影响因子：
--
通讯作者：
Won-Yeol Lee;I. Akyildiz
中科院分区：
文献类型：
--
作者：
Won-Yeol Lee;I. Akyildiz
认知无线电（CR）网络在不降低授权用户性能的前提下，实现了对稀缺频谱资源的高利用率。由于频谱可用性随时间和空间变化，基于基础设施的CR网络需要具有动态的小区间频谱共享能力。这允许公平的资源分配以及容量最大化，并避免经典频谱共享方法中出现的饥饿问题。在本文中，提出了一种联合频谱和功率分配框架，通过以下方式解决这些问题：（i）基于许可用户活动（排他性分配）机会主义地协商额外频谱，以及（ii）为每个小区共享预留频谱（共用共享）。我们的算法占最大的小区容量，最大限度地减少对相邻小区造成的干扰，并通过一个复杂的功率分配方法保护授权用户。仿真结果表明，所提出的小区间频谱共享框架实现了更好的公平性和更高的网络容量比传统的频谱共享方法。
Cognitive radio (CR) networking achieves high utilization of the scarce spectrum resources without causing any performance degradation to the licensed users. Since the spectrum availability varies over time and space, the infrastructure-based CR networks are required to have a dynamic inter-cell spectrum sharing capability. This allows fair resource allocation as well as capacity maximization and avoids the starvation problems seen in the classical spectrum sharing approaches. In this paper, a joint spectrum and power allocation framework is proposed that addresses these concerns by (i) opportunistically negotiating additional spectrum based on the licensed user activity (exclusive allocation), and (ii) having a share of reserved spectrum for each cell (common use sharing). Our algorithm accounts for the maximum cell capacity, minimizes the interference caused to neighboring cells, and protects the licensed users through a sophisticated power allocation method. Simulation results reveal that the proposed inter-cell spectrum sharing framework achieves better fairness and higher network capacity than the conventional spectrum sharing methods.