Carrier aggregation is a technique used in mobile networks to increase bandwidth by combining two or more channels. The technology was initially deployed for 3G HSPA+ to enable higher data rates for bursty application. In 4G, carrier aggregation is adopted as part of LTE-Advanced to aggregate a maximum of five component carriers of 1.4, 3, 5, 10, 15 or 20 MHz in order to increase bandwidth, and thereby increase the bitrates. The maximum aggregated bandwidth achievable using carrier aggregation in LTE-Advanced is 100 MHz.