CIF: NeTs Small: Collaborative Research: Distributed Spectrum Leasing via Cross-Layer Cooperation

CIF：NetTS：Small：合作研究：通过跨层合作实现分布式频谱租赁 ?认知无线电？其中主（许可）和次（未许可）终端在相同带宽上共存的网络被认为是解决频谱短缺和过度拥挤的有希望的解决方案。实现这种共存的主要常规方法是：（i）底层/覆盖/交织策略，其对次级行为实施严格约束以避免对初级的干扰;以及（ii）系统范围的动态频谱分配。这两个框架都有显着的缺点，实现大规模分布式认知无线电网络，由于技术和理论的限制二级频谱感测（i）和协议和架构的严格约束（ii）。为了解决上述问题，本研究介绍和研究的新框架分布式频谱租赁通过跨层合作（DiSC）的基本机制，以指导设计的媒体访问控制/数据链路（MAC/DL）-物理（PHY）层协议在分散的认知无线电网络。根据这一框架，动态？租赁？传输机会（例如，从主节点到次终端的通信（例如，时隙）是在本地执行的，这是由在MAC/DL-PHY层处的给定服务质量（QoS）测量方面的主需求驱动的。具体来说，DiSC使每个主要终端？租赁？以MAC协议数据单元（MPDU）粒度向本地次终端提供传输机会以交换协作（中继）。该项目的目的，一方面，在理论上理解的潜力的方法从网络信息理论和网络理论的观点，另一方面，在（干净的石板和向后兼容）设计的MAC/DL-PHY协议，有效地实现DiSC在复杂的无线环境。关键词：频谱租用、动态资源分配、认知无线电、协同传输、跨层设计、多跳无线网络。

CIF: NeTS: Small: Collaborative research: Distributed Spectrum Leasing via Cross-Layer Cooperation ?Cognitive radio? networks, in which primary (licensed) and secondary (unlicensed) terminals coexist over the same bandwidth, are regarded as a promising solution to address spectral shortage and overcrowding. The main conventional approaches to enable such coexistence are: (i) Underlay/ overlay/ interweave strategies, which enforce strict constraints on the secondary behavior in order to avoid interference to the primary; and (ii) System-wide dynamic spectrum allocation. Both frameworks have significant drawbacks for implementation of large-scale distributed cognitive radio networks due to technological and theoretical limits on secondary spectrum sensing for (i) and on the stringent constraints on protocols and architectures for (ii). To address the problems highlighted above, this research introduces and studies the novel framework of Distributed Spectrum Leasing via Cross-Layer Cooperation (DiSC) as a basic mechanism to guide the design of Medium Access Control/ Data Link (MAC/DL) - Physical (PHY) layer protocols in decentralized cognitive radio networks. According to this framework, dynamic ?leasing? of a transmission opportunity (e.g., a time-slot) from a primary node to a secondary terminal is performed locally as driven by primary needs in terms of given Quality-of-Service (QoS) measures at the MAC/DL-PHY layers. Specifically, DiSC enables each primary terminal to ?lease? a transmission opportunity to a local secondary terminal at MAC Protocol Data Unit (MPDU) granularity in exchange for cooperation (relaying). The project aims, on the one hand, at a theoretical understanding of the potentiality of the approach from the standpoints of network information theory and networking theory, and, on the other, at the (clean-slate and back-compatible) design of MAC/DL-PHY protocols that effectively implements DiSC in a complex wireless environment. Keywords: Spectrum leasing, dynamic resource allocation, cognitive radio, cooperative transmission, cross-layer design, multi-hop wireless networks.