“…In accordance with the related work on scheduling [2], [3], [4], [5], [7], [10], [11], [12], [13], [15], [16], [17], [18], [19], [20], an item is simply a piece of information that a client may acquire through a single query. It is clarified that in pushbased broadcast scheduling, the term "client query" does not imply posting a request to a server, but rather waiting for the broadcast of a specific item.…”