单项选择题
The Uplink State Flag(USF) field is part of:（）
A.MAC header B.TLLI C.RLC header
单项选择题 How many families of MCS are defined for EGPRS?（）
单项选择题 The SCTP layer in the C7 signalling protocol stack is responsible for which of the following:（）
单项选择题 What is the name of the protocol that is used between the MSC Server and the M-MGw?（）
