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COST INTERACT working group (WG)1 aims at increasing the theoretical andexperimental understanding of radio propagation and channels in environments ofinterest and at deriving models for design, simulation, planning and operationof future wireless systems. Wide frequency ranges from sub-GHz to terahertz(THz), potentially high mobility, diverse and highly cluttered environments,dense networks, massive antenna systems, and the use of intelligent surfaces,are some of the challenges for radio channel measurements and modeling for nextgeneration systems. As indicated in [1], with increased number of use cases(e.g., those identified by one6G [2] and shown in Fig. 1) to be supported and alarger number of frequency bands, a paradigm shift in channel measurements andmodeling will be required. To address the particular challenges that come withsuch a paradigm shift, WG1 started the work on relevant topics, ranging fromchannel sounder design, metrology and measurement methodologies, measurements,modeling, and systematic dataset collection and analysis. In addition to thecore activities of WG1, based on the strong interest of the participants, twosub-working groups (subWGs) have been initiated as part of WG1: i) subWG1.1 onmillimeter-wave (mmWave) and THz sounding (subWG THz) and ii) subWG1.2 onpropagation aspects related to reconfigurable intelligent surfaces (RIS) (subWGRIS). This white paper has two main goals: i) it summarizes the state-of-theartin radio channel measurement and modeling and the key challenges that thescientific community will have to face over the next years to support thedevelopment of 6G networks, as identified by WG1 and its subWGs; and ii) itcharts the main directions for the work of WG1 and subWGs for the remainder ofCOST INTERACT duration (i.e., until October 2025).

White Paper on Radio Channel Modeling and Prediction to Support Future Environment-aware Wireless Communication Systems