关于LTE系统内切换的描述，以下说法正确的是_______. | About the description of handover in LTE system, which statements are RIGHT? ______
A.同一基站的不同扇区之间的切换属于软切换 | HANDOVER BETWEEN CELLS FROM THE SAME ENB IS SOFT HANDOVER.
B.不同基站的扇区之间的切换属于硬切换。 | HANDOVER BETWEEN CELLS FROM DIFFERENT ENB IS HARD HANDOVER.
C.基于S1口的切换属于软切换。 | HANDOVER VIA S1 INTERFACE IS SOFT HANDOVER.
D.基于X2口的切换属于硬切换。 | HANDOVER VIA X2 INTERFACE IS HARD HANDOVER.
正确答案是BD