96 bins results in the maximum channel BW of 200 MHz for 60 kHz SCS. The number of subcarriers (107) for the synchronization channel would set the min- imum channel bandwidth to 10 MHz for 60 kHz SCS, but the current channelization in FR2 bands only requires 50 MHz minimum channel bandwidth. Given the smaller frequency range in FR2 (about one octave) compared to FR1 (more than a decade), only two SCSs are useful. Table 12.4 reports the same elements as for FR1 in Section 12.3.1 in terms of the max- imum RBs for CP-OFDM and DFT-s-OFDM, related SU in %, and associated minimum guard bands for the 60 and 120 kHz SCSs. It is to be noted that only up to 95% SU is achieved. Refer to Section 12.3.1 for a detailed explanation of the sub-carrier and RB alignment rules which are common to all frequency ranges and the resulting half SCS shift and SU. 12.4.2 FR2 Bands In the Release 15 specifications, there are a very limited number of FR2 bands, and most of them are concentrated in the 24-30 GHz region with some overlap (Table 12.5). The 12 5G RF Design Challenges Table 12.4 Supported channel bandwidths in FR2 and associated spectrum utilization. FR2 Channel BW (MHz) Parameters (kHz) DFT-s-OFDM and CP-OFDM SU [#RB] DFT-s-OFDM and CP-OFDM SU [max%] Min. guard band (MHz) Table 12.5 Release 15 FR2 bands. Frequency range (MHz) Regions 26 500-29 500 Korea, Japan 24 250-27500 Europe, China 37 000-40 000 United States 1500-28350 United States reason for a separate band in that sub-range is linked to the regional footprint of bands, while implementing the full sub-range would be challenging due to the 20% relative bandwidth. All bands use TDD duplex mode, which is a prerequisite for beamforming operation in the current specification. 12.4.3 FR2 Key RF Parameters Unlike for the FR1 operation, UE RF conformance tests at FR2 cannot be performed at the antenna port using coaxial cables. Consequently, all of the 38.101-2 requirements are measured OTA, and in the beamforming operation. In FR1, OTA measurements consist of total radiated po