Radio Resource Management in Cognitive Radio Networks

认知无线电是为了解决无线通信中的频谱稀缺问题而引入的一个新概念，它允许许可频谱与非许可频谱共享。对于基于认知无线电的无线网络，提供高效的频谱利用和稳定的服务是至关重要的，也是技术上的挑战。本研究将在考虑硬件、频谱移动性、多跳传输和无线信道等实际限制的情况下，通过在许可用户和非许可用户之间实现动态频谱分配来解决这一问题。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提供质量；（ii）健全的资源管理机制，以对抗潜在的频谱感知错误；（iii）采用分散式电话接纳控制方法，以保证新电话及现有电话的服务质素；（iv）在分组和呼叫两级进行容量分析的数学模型；(v)有效的频谱切换方法，在未授权用户之间实现平滑无缝的信息传播。

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. The research will help to accelerate the commercial applications of the cognitive radio technology in wireless communications. It will develop new networking protocols and control algorithms critical for implementing connections among unlicensed users, even in a dynamic network topology without infrastructure. The cutting-edge research will generate new ideas and knowledge in cognitive radio and enable the development of new products, which will foster a vital competitive edge for Canadian Information and Communication Technology industry in the international market place. The proposal will result in significant benefits to Canadian users, such as new wireless communication services and applications, safe and energy efficient equipments, and global Internet access.