Carrier aggregation is the most demanded feature out of the LTE-Advanced (3GPP Release 10) feature set. This feature allows the aggregation of component carrier that for instance reside in different frequency bands. Especially U.S.-based network operator show a strong interest in carrier aggregation, as it is the way out of the very fragmented spectrum allocation here in the U.S. Carrier aggregation is adding some complexity to LTE and of course our customers have an interest to understand the feature in greater detail as well as how our solutions, especially the CMW500, could be utilized to test carrier aggregation. The attached TechPaper is our response to this demand. On 12 pages carrier aggregation is described with all of its aspects, different types and modes, impact on signaling procedures and how to test using Rohde&Schwarz turnkey solutions, including CMW500.