A.MS---SGSN B.SGSN---GGSN C.SGSN---HLR D.GGSN---DNS
A.MS---SGSN B.SGSN---HLR C.SGSN---GGSN D.SGSN---MSC
A.Cell update B.RA update C.Combined RA/LA update D.Cancel Lacation