R1 operating bands are captured in TS 38.101-1 and are intended to be verified by conducting measurements similar to LTE and has been recently extended to 7.125 GHz to encompass newly available spectrum above 5.925 GHz. The requirements for FR2 operating bands are captured in TS 38.101-2 and can only be verified using radiated measurements, which is a big difference compared to LTE. However, RF requirements are not directly defined for frequency ranges; instead, RF requirements are still associated with operating bands and channel bandwidths, and therefore in the next paragraph we discuss how the new 5G operating bands are numbered. 12.2.2.1 5G Operating Band Numbering Scheme 3G Wideband Code-Division Multiple Access (WCDMA) band numbers were using Roman numerals, that is, capital letters, band I being the most widespread WCDMA band at 2 GHz. Then, in 4G, LTE band numbers used standard Arabic numerals, and where LTE and WCDMA have the same frequency arrangement, then the band num- bers match. For 5G, it was decided to use Arabic numerals similar to LTE but with the n-prefix as it was deemed beneficial to keep an easy linkage between 5G, LTE, and WCDMA band numbering. Therefore, if an LTE and 5G band have the same frequency arrangement, then LTE and 5G have the same band number, but 5G uses the n-prefix. As an example, WCDMA band I corresponds to LTE band 1 and 5G band nl. From Release 15 onward, 3GPP decided to allocate operating band numbers in such a way that 5G FR1 bands will have band numbers between n65 and n256, and 5G FR2 bands will have band numbers starting from n257. New LTE Frequency Division Duplex (FDD) bands will share band numbers with 5G FR1 bands, and band numbers 12 5G RF Design Challenges Table 12.1 5G VS. LTE band number scheme. 5G FR1/FR2 Band # Duplex Band # Duplex Legacy LTE FDD band numbers Legacy LTE TDD band numbers New LTE/5G FR1 band All duplex All duplex numbers modes modes New 5G FR2 band n257 and numbers above are assigned on a first-come, first-served basis. As an exception, new LT