Carrier Aggregation in LTE

Hello Dear Experts,
Does anyone knows where can I find an easy explanation of Carrier Aggregation?

This is a feature introduced whith what we call advanced LTE.
The scheduler in MAC layer will allocate ressources to some UEs who fill the requirement from the serving cell Pcell and frol other LTE carriers which are defined to be a subject for aggregation.

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Advance in order to increase the bandwidth and data rate.
Each aggregated carrier is referred to as a component carrier (CC).
The component carrier can have a bandwidth of up to 20 MHz, and a maximum of four
component carriers can be aggregated.
The individual component carriers can also be of different bandwidths.
There are several features which support different carrier aggregation scenarios.

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https://www.3gpp.org/technologies/keywords-acronyms/101-carrier-aggregation-explained

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Here you can find an excellent doc. A really “must read” if you want to learn CA (Carrier Aggregation)

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