When to use Extend Cyclic Prefix (ECP)?

[ankgitm]

Ok thanks dear. I also feel globally no network used extended CP in LTE.

[RFSpecialist]

It is used country side for large delays and large cell radius.

[cheikh789]

ECP adds overhead thus decreasing the effective bit rate & lowering capacity, i.e. 6 versus 7 symbols exist per timeslot.