Section: 4.2.5.1.7 Substate, ATTEMPTING-TO-UPDATE-MM
Content: The MS shall: - perform cell selection/reselection according to 3GPP TS 43.022[ None ]  [82] and 3GPP TS 25.304[ None ]  [98]; - receive and transmit user data and signalling information; - initiate routing area update indicating "combined RA/LA updating with IMSI attach" on the expiry of timers T3311 or T3302; - initiate routing area update indicating "combined RA/LA updating with IMSI attach" when the routing area of the serving cell has changed and the location area this cell is belonging to is not in the list of forbidden LAs. GPRS MSs in operation modes C or A shall answer to paging requests. GPRS MS in operation mode B may answer to paging requests.