NeTS:Small:Collaborative Research:Holistic Transparent Performance Assurance within the Crowded Spectrum

该奖项是根据2009年《美国复苏和再投资法案》(Public Law 111-5)资助的。Chap商用现成无线设备正越来越多地被用于性能敏感的应用，如带有身体传感器的患者监护和多媒体和游戏的家庭网络。然而，当无线通信使用相同或相邻的无线电频率时，它们可能会相互干扰。随着公共2.4 GHz频谱被包括802.11b/g路由器、ZigBee传感器、蓝牙耳机和无绳电话在内的各种设备所填充，这成为一个日益严重的问题。现有的干扰缓解方案与特定平台的物理层/MAC层紧密绑定，因此通常无法在不牺牲系统性能的情况下在同一网络中共存。该项目开发了一个全面的透明性能保证(HTPA)框架，以支持拥挤频谱中对性能敏感的应用程序。HTPA包括1)频谱剖析器，用于对不同类型无线环境中的频谱使用和动态外部、内部和平台间干扰进行建模；2)虚拟媒体访问控制层，用于提供统一接口以透明地表示、监控和调度底层无线电资源；以及3)流和系统性能保证组件，用于为每个单独的数据流调度无线电资源，并基于系统知识、MAC抽象和动态频谱模型利用网络干扰。HTPA使网络设计人员能够系统地了解和缓解异类无线设备之间存在的复杂干扰的影响，并为未来在未经许可的频谱中运行的商业无线平台的标准化提供参考模型。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Cheap commercial off-the-shelf wireless devices are being increasingly deployed for performance-sensitive applications such as patient monitoring with body sensors and home networking for multimedia and gaming. However, wireless communications may interfere with each other when they use the same or adjacent radio frequencies. This becomes a growing issue as the public 2.4GHz spectrum is being populated by a variety of devices, including 802.11b/g routers, ZigBee sensors, Bluetooth headsets, and cordless phones. Existing interference mitigation schemes are tightly tied with the physical/MAC layers of particular platforms, and hence often cannot co-exist in the same network without sacrificing the system performance. This project develops a Holistic Transparent Performance Assurance (HTPA) framework to support performance-sensitive applications in the crowded spectrum. HTPA consists of 1) a spectrum profiler that models the spectrum usage and dynamic external, intra- and inter-platform interferences in heterogeneous wireless environments; 2) a virtualized medium access control layer that provides unified interfaces for transparently representing, monitoring, and scheduling the underlying radio resources; and 3) a stream and system performance assurance component that schedules radio resources for each individual data stream, and harnesses network interference based on the system knowledge, MAC abstractions, and dynamic spectrum models. HTPA enables network designers to systematically understand and mitigate the impact of complex interference that exist between heterogeneous wireless devices, and provides reference models for the standardization of future commercial wireless platforms operating in unlicensed spectrums.