What exactly requires time sync? I think it's mainly stuff like inter-cell handover, MIMO with multiple cells streaming downlink to a single phone, these kind o

What exactly requires time sync? I think it's mainly stuff like inter-cell handover, MIMO with multiple cells streaming downlink to a single phone, these kind of things. It should work as long as the base stations are synced well -- no matter what reference. Or they just drop the features that require good sync. [Edit: maybe TDD mode? but they could settle for FDD...]