noun
time slot; broadcast slot
Refers to a scheduled period in a TV or radio programming lineup.
この番組は深夜の放送枠で放送されます。
This program will be broadcast in a late-night time slot.
時間帯 is a general 'time zone/period', while 放送枠 specifically refers to a broadcast programming slot.
Compound of 放送 (broadcast) and 枠 (frame/slot).