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

协同研究：跨层合作的分布式频谱租赁？认知无线电?主终端（授权）和从终端（未授权）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问题的一种很有前途的解决方案。实现这种共存的主要传统方法是：(i)底层/覆盖/交织策略，对次要行为实施严格约束，以避免对主要行为的干扰；（ii）全系统动态频谱分配。这两种框架在实现大规模分布式认知无线电网络方面都有明显的缺点，这是由于(i)在二次频谱传感方面的技术和理论限制，以及（ii）在协议和架构方面的严格限制。为了解决上述突出的问题，本研究引入并研究了通过跨层合作的分布式频谱租赁（DiSC）的新框架，作为指导分散认知无线电网络中介质访问控制/数据链路(MAC/DL) -物理层（PHY）协议设计的基本机制。根据这个框架，动态租赁？一个传输机会（例如，一个时隙）从一个主节点到一个辅助终端在本地执行，在MAC/DL-PHY层根据给定的服务质量（QoS）措施的主要需求驱动。具体来说，DiSC使每个主终端能够“租用”。以MAC协议数据单元（MPDU）粒度向本地二级终端传输的机会，以换取合作（中继）。一方面，该项目旨在从网络信息理论和网络理论的角度对该方法的潜力进行理论理解，另一方面，在复杂的无线环境中有效实现DiSC的MAC/DL-PHY协议的（从头开始和向后兼容）设计。关键词：频谱租赁，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.