单项选择题
What can MS do when it is standby state？（）
A.Transfer data packets B.Receive PS or CS paging C.Do nothing D.Cell update
单项选择题 What could a MS do when its state changes from idle to ready？（）
单项选择题 When does a MS get IP address？（）
单项选择题 Old SGSN can get new SGSN’s IP address by communicating to （） when a MS requests inter_SGSN RA update.
