What are LTE bands?

The configured multiple serving cells (primary cell (PCell) and secondary cell (SCell)) are aggregated together to serve the UE . The PCell perform random access (RA) procedure, radio link monitoring (RLM), handover procedure and PUCCH transmission.

CA Bandwidth Class Definition It means that total aggregated RB should be less than 100 . Following shows some example cases which is allowed and not allowed configuration. Case 1 : PCC = 10 Mhz (max 50 RB), SCC = 10 Mhz (max 50 RB). It would give max aggregated RB is 50 RB +50 RB which is <= 100. So this is allowed.

A primary component carrier (PCC) is complemented with one or several secondary component carriers (SCC) . The PCC handles all the control signaling while the SCC is used to increase the data throughput. The carriers can be FDD, TDD or a mix of FDD and TDD with location in one or multiple frequency bands.

If you aggregate two component carriers then it will be 2CA . Whereas, if there are three or four carriers – then it is 3CA or 4CA respectively. The more the component carriers, the better will be the data speed. Types of CA. However, the most common one is wireless communication.