A.UE小區(qū)間切換 B.UE跨系統(tǒng)重選 C.傳輸用戶業(yè)務(wù)數(shù)據(jù) D.空中接口參數(shù)
A.MME和SGW B.MME和HSS C.SGW和PGW D.eNodeB和MME
A.S1-U B.S1-MME C.X1 D.X2