24.4 dBi for both transmitter and receiver. These measurements show that pathloss exponents are 2.39 in LOS, and 4.0 in NLOS links for the case of the best Tx and Rx beams matching. 4 Left: Measurement sites of Samsung complex in Suwon, Korea, Right: Path loss exponent results The results obtained from the three measurement campaigns in 28/38 GHz bands, show that pathloss exponent in NLoS link is between 3.2 and 4.58. This range is not much discrepant from that in the conventional IMT bands (i.e. 3.67~3.91) [17]. Lastly, we would like to note that although rain attenuation will place natural limits on radio propagation in mm-wave bands, it does not much affect within the range of our interest. In case of even heavy rain with rate of 60 mm/hr, rain attenuations for 200 meter distance are only 2 dB and 3 dB in 27 GHz and 38 GHz, respectively [18][19]. Remark 2 Mm-wave frequency is feasible for mobile broadband access, i.e. IMT, over 200 meters even in outdoor NLoS environments. 4 Concluding Remarks This document summarizes the technology status and the channel measurement results to provide evidence in support of feasibility of using mm-wave frequency for IMT systems. From the standpoint of semiconductor technology, we have shown by pointing to credible references that both MMIC-based and silicon-based technologies for power amplifier are adequately developed and are now mature for implementation. To build trust in the propagation physics of the mm-wave channel, we shared the results, obtained through extensive measurement, which indicate that the observed/measured pathloss exponents are adequate for supporting a communication link over 200 meters even in outdoor NLoS environments. Based on the measurements and the analysis of the state of the semiconductor industry, it appears feasible to utilize mm-wave frequencies for IMT systems.
24.4 dBi for both transmitter and receiver. These measurements show that pathloss exponents are 2.39 in LOS, and 4.0 in NLOS links for the case of the best Tx and Rx beams matching. 4 Left: Measurement sites of Samsung complex in Suwon, Korea, Right: Path loss exponent results The results obtained from the three measurement campaigns in 28/38 GHz bands, show that pathloss exponent in NLoS link is between 3.2 and 4.58. This range is not much discrepant from that in the conventional IMT bands (i.e. 3.67~3.91) [17]. Lastly, we would like to note that although rain attenuation will place natural limits on radio propagation in mm-wave bands, it does not much affect within the range of our interest. In case of even heavy rain with rate of 60 mm/hr, rain attenuations for 200 meter distance are only 2 dB and 3 dB in 27 GHz and 38 GHz, respectively [18][19]. Remark 2 Mm-wave frequency is feasible for mobile broadband access, i.e. IMT, over 200 meters even in outdoor NLoS environments. 4 Concluding Remarks This document summarizes the technology status and the channel measurement results to provide evidence in support of feasibility of using mm-wave frequency for IMT systems. From the standpoint of semiconductor technology, we have shown by pointing to credible references that both MMIC-based and silicon-based technologies for power amplifier are adequately developed and are now mature for implementation. To build trust in the propagation physics of the mm-wave channel, we shared the results, obtained through extensive measurement, which indicate that the observed/measured pathloss exponents are adequate for supporting a communication link over 200 meters even in outdoor NLoS environments. Based on the measurements and the analysis of the state of the semiconductor industry, it appears feasible to utilize mm-wave frequencies for IMT systems.