A.Establish Cause B.LAC&CI C.Random Reference D.TA E.IMSIorTMSI
A.LAPD B.DTAP C.BSSMAP D.MAP E.MTP
A.小區(qū)內部切換 B.BTS內部切換 C.BSC內部切換 D.MSC內部切換、MSC外部切換