Complex sentence: This is one major difference from BBU Hoteling, or base station hoteling; in the latter case, the BBUs of different base stations are simply stacked together and have no direct link among them to allow physical layer co-ordination.
Split into simpler sentences: This is one major difference from BBU Hoteling, or base station hoteling. In the later case, the BBU of different base stations are simply stacked together and has no direct link among them to allow physical layer co-ordination.