Cognitive Radio Resource Management for QoS Guarantees in Autonomous Femtocell Networks
Cognitive Radio Resource Management for QoS Guarantees in Autonomous Femtocell Networks
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DOI：
10.1109/icc.2010.5502784
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发表时间：
2010-05
期刊：
影响因子：
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通讯作者：
Shao-Yu Lien;Chih-Cheng Tseng;Kwang-Cheng Chen;Chih-Wei Su
中科院分区：
文献类型：
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作者：
Shao-Yu Lien;Chih-Cheng Tseng;Kwang-Cheng Chen;Chih-Wei Su
部署嵌入宏蜂窝覆盖范围的毫微微蜂窝网络可以通过多种方式极大地提高通信质量。然而，缺乏有效减轻干扰、充分利用无线电资源和提供服务质量（QoS）保证（在延迟方面）的方案，给毫微微蜂窝基站概念的实际推广带来了挑战。为了应对这些挑战，实现成功的密集毫微微蜂窝基站部署，受认知无线电技术精神的启发，本文提出了一种认知无线电资源管理（CRRM）方案。具有所提出的CRRM的毫微微小区可以自主地感测宏小区的无线资源使用情况，从而减轻干扰，而不需要集中的方式。通过分析推导指定系统QoS保证能力的CRRM有效容量，提出CRRM的最佳感知周期和无线资源分配，以在统计保证femtocell的QoS的同时实现无线资源的充分利用。数值结果表明，所提出的 CRRM 在无线资源利用效率方面优于随机方案（无 CRRM）。仿真结果也支持延迟保证性能的有效性。
Deploying femtocell networks embedded in the Macrocell coverage greatly benefits communication quality in variety manners. However, the lack of schemes to effectively mitigate detractive interference, fully utilize radio resources and provide quality-of-service (QoS) guarantee (in terms of delay) creates challenges to practically facilitate the concept of femtocell. To tackle these challenges to achieve a successful dense femtocell deployment, this paper proposes a cognitve radio resource management (CRRM) scheme which is inspired by the spirit of cognitive radio technology. Instead of the need of a centralized manner, the femtocell with the proposed CRRM can autonomously sense the radio resource usage of the Macrocell so as to mitigate interference. By analytical deriving the effective capacity of the CRRM that specifies the QoS guarantee capability of the system, the optimum sensing period and radio resource allocation are proposed for the CRRM to achieve a fully radio resource utilization while statistically guaranteeing the QoS of the femtocell. Numerical results demonstrate that the proposed CRRM outperforms the randomized scheme (without CRRM) in terms of the radio resource utilization efficiency. Simulation results also support the effectiveness on the delay guarantee performance.