Cognitive Coexistence of Non-cooperative Heterogeneous Wireless Systems

频谱共享最近被视为提高现有无线系统性能、满足日益增长的频谱接入需求以及实现新应用的重要组成部分。例如，蜂窝系统可以通过毫微微小区提供更好的覆盖和容量，其中主网络使用的频谱在由低功率基站覆盖的本地区域共享。此外，频谱共享作为一种解决频谱稀缺悖论的方法正受到越来越多的关注，因为存在着大量低效利用许可频谱的情况。在这种情况下，在频谱的主用户和次用户之间以及在多个并置的次系统之间出现共存问题。通常，媒体访问控制和物理层标准不支持网间通信，协作共享策略非常有限。因此，不同的无线系统将需要共存，同时独立运行，而不需要合作。*本研究计划的目标是开发一种集成的物理层、链路层、介质访问控制和网络层的方法，用于非协作的异构系统的共存。这将把实时多维频谱感知信息(发射机的数量和类型、其参数、位置和业务特征)纳入通信协议的设计中。*预期的研究结果将对未来射频环境的演变产生重大影响，在这种环境中，越来越多不同的无线和基于认知无线电的系统将共存于相同的频段。因此，频谱将得到有效利用，这将为新的利益相关者打开机会，并为无线行业和消费者提供有效的替代方案，以应对不断增长的数据流量和服务需求。

Spectrum sharing has been recently seen as a vital ingredient in enhancing the performance of existing wireless systems, satisfying the growing demand for spectrum access, and enabling new applications. For example, cellular systems can provide improved coverage and capacity via femto cells, in which the spectrum used by the main network is shared over a local area covered by a low power base station. Furthermore, spectrum sharing is receiving increasing attention as a solution to the paradox of spectrum scarcity amid the existence of broad expanses of inefficiently utilized licensed spectrum. In such scenarios, coexistence problems arise between the primary and secondary users of the spectrum, as well as between multiple collocated secondary systems. Usually, the medium access control and physical layer standards do not support inter-network communications, and cooperative sharing strategies are very limited. Hence, heterogeneous wireless systems will need to coexist while operating independently without cooperation. ****The aim of this research program is to develop an integrated physical, link, medium access control, and network layer approach for the coexistence of non-cooperative heterogeneous systems. This will incorporate real-time multi-dimensional spectrum awareness information (number and type of transmitters, their parameters, location, and traffic characteristics) into the design of the communications protocols. ****The anticipated research results will strongly impact the evolution of the future radio frequency environment in which increasingly diverse populations of wireless and cognitive radio-based systems will coexist in the same bands. An efficient utilization of the spectrum will thus be enabled, which will open opportunities for new stakeholders, and provide effective alternatives for the wireless industry and consumers to cope with the continuously growing demand for data traffic and services.************************