多选题 : 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）基于S1口的切换属于软切换。 | Handover via S1 interface is soft handover.
（C）基于X2口的切换属于硬切换。 | Handover via X2 interface is hard handover.
（D）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.
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