scope:

The present document is intended to study:

a) communication models that strike a suitable trade-off between electromagnetic accuracy and simplicity for performance evaluation and optimization at different frequency bands;

b) channel models (deterministic and statistical) that include path-loss and multipath propagation effects, as well as the impact of interference for application to different frequency bands;

c) channel estimation, including reference scenarios, estimation methods, and system designs; and

d) key performance indicators and the methodology for evaluating the performance of RIS for application to wireless communications, including the coexistence between different network operators, and for fairly comparing different transmission techniques, communication protocols, and network deployments.