Cognitive Coexistence of Non-cooperative Heterogeneous Wireless Systems

频谱共享近来已被视为增强现有无线系统的性能、满足对频谱接入的日益增长的需求以及实现新应用的重要组成部分。例如，蜂窝系统可以经由毫微微小区提供改进的覆盖和容量，其中，在由低功率基站覆盖的局部区域上共享由主网络使用的频谱。此外，频谱共享作为在存在广泛的低效利用的许可频谱的情况下频谱稀缺的矛盾的解决方案正受到越来越多的关注。在这样的场景中，在频谱的主用户和次用户之间以及在多个并置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络间通信，并且协作共享策略非常有限。因此，异构无线系统将需要共存，同时独立操作而不合作。* 本研究计划的目的是开发一个集成的物理，链路，介质访问控制和网络层的方法，用于非合作异构系统的共存。这将把实时多维频谱感知信息（发射机的数量和类型、它们的参数、位置和业务特性）纳入通信协议的设计中。* 预期的研究结果将强烈影响未来无线电频率环境的演变，其中越来越多的无线和基于认知无线电的系统将共存于同一频段。因此，频谱的有效利用将成为可能，这将为新的利益相关者带来机会，并为无线行业和消费者提供有效的替代方案，以科普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.************************