The diversity of carrier aggregation across regions is increasing. Not only are the number of frequency band combinations multiplying, but we are now moving into an era of increasing CCs (component carriers), from 2CC to 3CC and soon 4CC.
|Band Combination||Multiplexer||Separate Antenna||Primary Region of Use|
|B1 + B3||x||China, Korea, Europe|
|B25 + B66||x||North America|
|B3 + B7||x||x||Europe, Middle East, Africa|
|B1 + B3 + B7||x||x||Korea|
|B3 + B7 + B20||x||x||Europe, Middle East, Africa|
|B39 + B41||x||China|
|B1 + B3 + B8||x||Japan|
Enabling carrier aggregation requires simultaneous communication on multiple CCs. In some cases, the RF front-end must support multiple transmit and/or receive paths between the antenna(s) and the transceiver.