【正文】 ............................................... 91 Change of work mode of operation........................................................................................................................... 91 Change of work mode of operation in GSM (GSM only) .............................................................................. 91 Change of work mode of operation in UMTS (UMTS only)......................................................................... 92 Change of work mode of operation at UMTS to GSM intersystem change .............................................. 92 Change of work mode of operation at GSM to UMTS intersystem change .............................................. 93 Intersystem change between GSM and UMTS ............................................................................................................ 94 List of forbidden PLMNs for GPRS service.....。 3GPP TS (202006) Technical Specification 3rd Generation Partnership Project。s .................................................................................................................... 36 GPRS MS operating in mode A or B in a work that operates in mode I ..................................................... 36 GPRS MS operating in mode A or B in a work that operates in mode II or III.......................................... 36 Core Network System Information for MM (UMTS only)........................................................................................ 36 Core Network System Information for GMM (UMTS only) .................................................................................... 37 MM sublayer states ........................................................................................................................................................... 37 MM sublayer states in the mobile station...................................................................................................................... 37 Main states.................................................................................................................................................................... 37 Substates of the MM IDLE state .............................................................................................................................. 41 The update Status .............................................................................................................................................................. 42 MM sublayer states on the work side ....................................................................................................................... 43 GPRS mobility management (GMM) sublayer states ................................................................................................. 44 GMM states in the MS...................................................................................................................................................... 44 Main states.................................................................................................................................................................... 44 Substates of state GMMDEREGISTERED .......................................................................................................... 45 Substates of state GMMREGISTERED ................................................................................................................ 46 GPRS update status ........................................................................................................................................................... 48 GMM mobility management states on the work side ............................................................................................ 48 Main States ................................................................................................................................................................... 48 Substates of state GMMREGISTERED ................................................................................................................ 49 Behaviour of the MS in MM Idle state, GMMDEREGISTERED state and GMMREGISTERED state.............. 49 Primary Service State selection....................................................................................................................................... 50 Selection of the Service State after Power On.............................................................................................................. 50 Other Cases......................................................................................................................................................................... 50 Detailed Description of the MS behaviour in MM IDLE State................................................................................. 51 Service State, NORMAL SERVICE .............................................................................................................................. 51 Service State, ATTEMPTING TO UPDATE............................................................................................................... 51 Service State, LIMITED SERVICE ............................................................................................................................... 52 3GPP 3GPP TS (202006) Release 4 4 Service State, NO IMSI .................................................................................................................................................... 52 Service State, SEARCH FOR PLMN, NORMAL SERVICE ................................................................................... 53 Service State, SEARCH FOR PLMN ............................................................................................................................ 53 Service State, RECEIVING GROUP C