Proposal of Channel Model Measurement Method Under Local 5G System Operation

Two types of channel model measurement methods are shown in this paper. Type 1 channel model is defined as a relation between distance and path loss for line design and Type2 is defined as a power delay profile (PDP) for MIMO design, respectively. Several measurement methods have been applied for these two channel models. These conventional measurement methods are suitable to implement before starting the system operation using the special transmitter signals. However, these methods are not suitable to use under operational system because it is not available to use these special signals. Therefore, we propose a new measurement method for the mentioned channel models under system operation. We set one receiver antenna for reference near transmitter equipment and a ratio of receiver spectrum and reference spectrum is applied for these measurements. In this proposed method, the special transmitting signal is unnecessary. We have applied this method to local 5G system under operation in Germany. A measurement of type 1 channel model is performed for both line of sight (LOS) and non-line of sight (NLOS) conditions. Especially a gradient linear approximation of the obtained measurement data at LOS condition is near to the gradient of Friis transmission equation. Furthermore, a measurement of type 2 channel model is performed and some obvious multipath signals are obtained.