A.MS
B.BSS
C.SGSN
D.GGSN

A.MS
B.SGSN
C.HLR
D.GGSN

A.TMSI
B.IMSI
C.TLLI
D.IP address

A.MSC
B.HLR
C.SGSN
D.GGSN

A.GPRS Service Network
B.GPRS Service Node
C.GPRS support Node
D.GPRS support Network

A.Cell Selection
B.Attach
C.PDP Context Activation
D.RA update

A.Cell
B.RA
C.LA
D.PLMN

A.GGSN
B.PCU
C.SGSN
D.DNS

A.Class A
B.Class B
C.Class C
D.Class D

A.空分复用
B.时分复用
C.码分复用
D.不复用

A.Ga
B.Gb
C.Gc
D.Gn