Cooperative Communication Based on Spectrum Aggregation in LTE Further Evolution

摘要

The implementation of wide band radio transmission may occur in two parallel ways:designing a new system with larger bandwidth,or constructing 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 the one hand,the advantage of the multi-carrier transmission scheme within a system and among systems is that the existing Radio Frequency (RF) techniques and elements can be sufficiently utilized,so system costs can be decreased.On the other hand,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.It can also efficiently guard band usage between FDD and Time Division Duplex (TDD) systems.Commercially,this has significant implications for operators.