LTE后续演进中基于频谱聚合的协同通信

大带宽无线传输有两个实现途径，一是设计频带更宽的单一系统，一是进行不同系统间的协同设计。前者是在同一种空口内采用基于多载波的频谱聚合，后者是在不同空口之间采用基于多载波并行传输的频谱聚合。通过多载波并行传输实现系统内和系统间频谱聚合，可以充分利用现有射频技术和器件，降低设备的研制和运营成本。而系统间的频谱聚合，特别是异构系统间的频谱聚合，除了可以扩展传输带宽的基本功能之外，还可以解决频分复用系统对非对称业务的支持以及时分双工保护带的利用问题，对运营商更具有商业上的现实意义。

Spectrum Aggregation Based Cooperative Communications in the LTE Further Evolution

The wide band radio transmission may be implemented in two parallel ways： to design a new system with larger bandwidth; to construct a cooperative system based on existing systems. The former is a spectrum aggregation scheme based on multi-carrier transmission within one system, while the latter fulfills spectrum aggregation based on multi-carrier transmission among systems. On one hand, the advantage of the multi-carrier transmission scheme within system and among systems lies in that the existing Radio Frequency （RF） techniques and elements can be sufficiently utilized, so the system cost can be decreased. On the other hand, the spectrum aggregation among systems, especially among heterogeneous air-interfaces, can not only expand the basic bandwidth functions, but also fulfill efficient spectrum usage for Frequency Division Duplex （FDD） system under the unbalanced Uplink/Downlink （UL/DL） service scenario and efficient guard band usage between FDD and Time Division Duplex （TDD） system. Commercially, this solution is more significant for operators.