LTE系统内的切换，通常从＿＿＿＿＿信令开始，到＿＿＿＿＿＿信令结束
A.EUTRAN HANDOVER REQUEST
B.MEASUREMENT REPORT
C.RRCCONNECTIONRECONFIGURATIOCOMPLETE
D.RRCCONNECTIONREESTABLISHMENTCOMPLETE
正确答案是BC