Experimental studies of spectrum masks of 5G base station transmitter operating in DSS mode to estimate feasibility of accomodation of 5G network within 4G frequency channels

One of the most attractive ways to quickly deploy 5G networks when new frequency bands are not yet available to local operators is to do it on the basis of Dynamic Spectrum Sharing (DSS) solution. The DSS mode provides 5G network with access to 4G spectrum resource and the use of a single-frequency broadcast network in which one part of OFDM-signal resource blocks is used to transmit LTE (4G) resource blocks, and the other part is used to transmit 5G resource blocks. Bearing in mind that 4G operator has a relevant spectrum license to transmit LTE signals, it is necessary to show that the spectrum mask of the combined frequency channel accommodating both 4G and 5G OFDM-signal resource blocks does not exceed authorized bandwidth and ensures EMC between LTE and 5G networks. Thus, the aim of the authors was to conduct experimental studies of spectrum masks of the combined 4G/5G frequency channel for different LTE channel bandwidths in real operating conditions of 5G base stations operating in the DSS mode and demonstrate that EMC is feasible.