A.10

B.72

C.6

D.108

A.IMPN

B.IMS

C.IMPO

D.IMPI

A.The drop rate refers to the probability of a business interruption in the business process, that is, the ratio of the number of abnormal interruptions to the total number of business operations.

B.Drop rate = number of dropped lines/successful completion of connection establishment

C.Dropping means that when the mobile phone does not send Disconnect signaling or does not receive the Disconnect/Release signaling, the mobile phone returns to the idle state, and it is regarded as a dropped call.

D.Drop refers to: Abnormal interruption of data transmission during normal data transmission of the terminal, including RRC connection abnormal interruption: or data rate is reduced to 0 for 5 seconds.

A.QCI = 5

B.QCI = 1

C.QCI = 9

D.QCI = 2

A.Filtering sessions based on C-MSISDN

B.Bearer anchor ATCF & ATGW

C.Inform the MSC to prepare to carry resources

D.Perform codec negotiation control