Radio Resource Management in Cognitive Radio Networks

认知无线电是为了解决无线通信中频谱稀缺问题而提出的一种新概念，它允许授权用户与非授权用户共享频谱。对于基于认知无线电的无线网络，提供高效的频谱利用率和稳定的服务是关键和技术上具有挑战性的。拟议的研究将解决这个问题，通过实现授权和未授权用户之间的动态频谱分配的硬件，频谱移动性，多跳传输和无线信道的实际限制的考虑下。特别是，拟议的研究将开发（i）分布式资源分配算法，以提高频谱利用率和服务质量的规定;（ii）强大的资源管理机制，以打击潜在的频谱感知错误;（iii）分布式呼叫准入控制方法，以保证服务质量的满意度，以新的和现有的呼叫;（iv）用于分组和呼叫级别的容量分析的数学模型;以及（v）用于在未授权用户之间平滑和无缝地传播信息的有效频谱切换方法。

Cognitive radio is a new concept, which is introduced to solve the spectrum scarcity issue in wireless communications by allowing the share of licensed spectrum with unlicensed users. For cognitive radio based wireless networks, the provisioning of both efficient spectrum utilization and stable services is critical and technically challenging. The proposed research will address this issue through achieving dynamic spectrum allocation between licensed and unlicensed users under the consideration of practical limitations on hardware, spectrum mobility, multihop transmission, and wireless channels. In particular, the proposed research will develop (i) distributed resource allocation algorithms for improved spectrum utilization and quality of service provisioning; (ii) robust resource management mechanisms to combat the potential spectrum sensing errors; (iii) distributed call admission control methods to guarantee the quality of service satisfaction to both new and existing calls; (iv) mathematical models for capacity analysis at both packet and call levels; and (v) effective spectrum handoff methods for smooth and seamless information dissemination among unlicensed users.