NeTS: Small: Collaborative Research: Fine-Grained Spectrum Access for Carrier-Aggregation Based Wireless Networks

NeTS：小型：协作研究：基于载波聚合的无线网络的细粒度频谱接入

• 批准号: 1617321
• 负责人: Xinyu Zhang
• 金额: $ 17.5万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-08-01 至 2020-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1617321&HistoricalAwards=false
• 关键词: NeTS; Small; Collaborative; Research; Fine

Dynamic spectrum access brings great benefits for users in overcrowded radio spectrum to opportunistically harvest spectrum resources, which is especially useful for high date rate applications such as video conferencing and multimedia streaming. Since available spectrum may be fragmented, carrier aggregation becomes a critical enabling technique. Many recent and emerging protocols (e.g., 802.11ac WiFi, 802.11af TV whitespace networks, 3GPP LTE unlicensed, and 802.11ay millimeter-wave networks) have been incorporating carrier aggregation mechanisms. However, these mechanisms are still preliminary and heavily rely on conventional MAC/PHY which is designed for nodes sharing the same contiguous channel. As carrier aggregation networks evolve to new generations, three inherent problems will become the fundamental barrier to their efficiency, fairness, and scalability: (i) a transmitter is unable to sense medium state during transmission, (ii) more users and high spectrum dynamics worsen the medium access contention, and (iii) the need of fast spectrum agreement to aggregate multiple fragmented spectrum chunks. The objective of this research is to explore general primitives to effectively realize carrier aggregation with three research components: (i) Migrate the spectrum sensing paradigm from "detect and then transmit" to "simultaneously transmit and detect". The end goal is to overcome the efficiency and fairness problems in standard spectrum sensing mechanisms to enable asynchronous, out-of-band OFDM spectrum sensing and multi-antenna based full-duplex sensing. (ii) Address the contention issue in wideband fragmented spectrum sharing with low collision probabilities and low overhead. A spectrum arbitration mechanism is proposed, enabled by a parallel bitwise signaling scheme and a novel compound packet preamble design. (iii) Design a light-weight in-band mechanism that achieves fast synchronization and spectrum agreement, so as to overcome the substantial control channel overhead for spectrum agreement under high spectrum dynamics. The success of the proposed research will enhance radio spectrum sharing, and inspire standardization bodies to incorporate the proposed new protocol primitives for much higher performance. A continuous effort will be made to integrate the proposed research to education program, to mentor undergraduate researchers, and recruit women and minority students.

动态频谱接入为用户在拥挤的无线电频谱中获取频谱资源带来了极大的好处，尤其适用于视频会议和多媒体流媒体等高数据速率应用。由于可用频谱可能是碎片化的，因此载波聚合成为关键的使能技术。许多最新的和新兴的协议（例如，802.11ac WiFi、802.11af电视空白网络、3GPP LTE免授权和802.11ay毫米波网络）已经纳入了载波聚合机制。然而，这些机制仍然是初步的，并且严重依赖于传统的MAC/PHY，这是为共享同一连续信道的节点设计的。随着新一代载波聚合网络的发展，三个固有的问题将成为其效率、公平性和可扩展性的根本障碍：(1)发射机在传输过程中无法感知介质状态；(2)用户多和高频谱动态加剧了介质接入争用；(3)需要快速的频谱协议来聚合多个碎片频谱块。本研究的目的是探索有效实现载波聚合的通用基元，研究内容包括三个方面：(1)将频谱感知范式从“检测然后发射”迁移到“同时发射和检测”。最终目标是克服标准频谱感知机制中的效率和公平性问题，实现异步、带外OFDM频谱感知和基于多天线的全双工感知。（ii）解决低碰撞概率、低开销的宽带碎片频谱共享中的争用问题。提出了一种基于并行位信令方案和复合分组前导设计的频谱仲裁机制。（iii）设计轻量级带内机制，实现快速同步和频谱一致，克服高频谱动态下频谱一致带来的大量控制信道开销。拟议研究的成功将增强无线电频谱共享，并激励标准化机构将拟议的新协议原语纳入更高的性能。将继续努力将拟议的研究纳入教育计划，指导本科生研究人员，并招收妇女和少数民族学生。