A fusion engine configured for execution on a ground radio station (GRS) for an unmanned aircraft system (UAS) operating environment is disclosed. In embodiments, the fusion engine tracks the wait times of UAS required to share a C2 channel while waiting for a full C2 link with the GRS, as well as the dynamic availability of C2 channels for full or shared C2 links over time. Based on the collected wait times and availability variables, the fusion engine generates congestion metrics relevant to the capacity of the GRS, e.g., its available spectrum resources, to effectively provide C2 services to every UAS operating within its coverage area. Congestion metrics include expected wait times on a shared C2 link fora UAS in service (e.g., waiting fora full C2 link) and/or the expected number of C2 channels available at the GRS at a given time.