Workload; Confusion; Communication Breakdown; Situational Awareness
ATC Issue All Types; Conflict Ground Conflict; Critical; Deviation / Discrepancy - Procedural Clearance; Ground Incursion Runway
Air Traffic Control Separated Traffic; Air Traffic Control Issued New Clearance; Flight Crew Took Evasive Action
Procedure; Airport
Initial taxi instructions Taxi to [Runway] XXL hold short XXL at BRAVO. Holding short tower asked if we were on frequency and cleared us to cross RWY XXL right turn on ECHO cross RWY XYR (freq clutter). Ground Control was combined with heavy radio traffic; call signs blocked aircraft transmissions overlapping (stepped on). Still thinking we were to use RWY XXL (clearance to RWY XXR was blocked after crossing RWY XYL/XZR) holding short monitoring Tower. We were instructed to Line up and wait (RWY number blocked). As we moved approximately 10 feet forward we noticed aircraft on final. Stopped. Tower advised aircraft was on about a 1-2 mile final to go-around 'aircraft on runway.' Aircraft on final acknowledged; but said there was no one on runway (frequency cluttered; Tower told aircraft to go-around a second and third time even though they had already initiated go-around). Tower then instructed us to line up and wait RWY XXL. We were subsequently cleared for takeoff RWY XXL; original runway issued in taxi instructions. Climbing out Departure Control said they did not know what happened but gave us a phone number to call. After landing at ZZZ I called. The gentleman answering said nothing of situation asked for my name; phone number; address and certificate number and said thank you. I feel the heavy traffic on combined ground control frequency led to confusion. They have two ground control frequencies and should use them when traffic is busy.
C560XL pilot reported a runway incursion due to a communication breakdown caused by heavy radio traffic.