Joonyoung Park details the technical configuration and parameter settings for time-division multiplexing ATSC 3.0 and 5G Broadcast signals on a single RF channel, facilitated by the new CAS-muting feature in 5G Broadcast Rel-19 and ATSC 3.0's coexistence capabilities. The article explains how to reconcile timing parameters across different systems, highlighting the `min_time_to_next` field in ATSC A/321 and `L1B_frame_length_mode` in A/322, and references the newly revised ATSC A/327:2026-04 as the authoritative guideline.
This turns ATSC 3.0 plus 5G Broadcast coexistence from a concept into a timing exercise with specific fields, units, and failure modes. The practical issue is not RF sharing in the abstract; it is aligning a 1 ms 3GPP CAS cycle with ATSC’s 5 ms frame timing and A/321’s sliding min_time_to_next table. The article also shows that misconfiguration can produce buffer growth and periodic transmitter restarts, which makes the signaling details operationally important for integrators. Watch for field trials that report their CAS cycle, ATSC frame length, and chosen min_time_to_next values, since those determine whether the link stays stable.
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