Traditional concept of having a Uplink / Downlink channels irrespective of TDD/FDD mode is the major point that defines how the spectrum is well utilised and also the ability for further aggregation.
3GPP RAT development team is working on existing Radio Network Coding to enhance the way of using the Channel without decoupling Logically (TDD) or band wise (FDD).
With this improvement, the Career Aggregation will be simpler than before and bandwidth can be provided on demand depending upon the availability with simple access procedure across different bands/RATs.
Figure 1 :- Simplified Career Aggregation Plan [by ETSI]
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