Carrier aggregation can be divided into carrier aggregation with the same frequency and carrier aggregation with different frequencies. Co-frequency carrier aggregation refers to combining multiple co-frequency carrier aggregation together, which can improve the transmission bandwidth and data rate of the system. Different frequency carrier aggregation refers to the combination of multiple carrier aggregation with different frequencies, which can achieve wider coverage and higher data rate.
In the LTE system, channel bandwidths of 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20MHz have been supported since it was first released. By using carrier aggregation technology, multiple such channel bandwidths can be bound together, thus increasing the transmission bandwidth of the system and improving the data transmission rate. For example, two 10MHz carriers can be aggregated to form a transmission bandwidth of 20MHz, thus providing a higher data rate.
In addition, the data support capability of mobile terminals is also hierarchical. For the mobile phone LTE CAT4/CAT6 standard, it is directly linked to the mobile phone chip, and then it needs the support of network operators to use it. If the province does not support high-speed data rate, even if the network side does, mobile phone users will still not be able to enjoy high-speed data service. Therefore, when using LTE carrier aggregation, it is necessary to ensure the support of mobile terminals and network operators.