Section: 4.1.3.1.2 Substates of state GMM-DEREGISTERED
Content: The GMM-DEREGISTERED state is subdivided into several substates as explained below. The substates pertain to the whole MS (ME alone if no SIM/USIM is inserted, or ME plus SIM/USIM). The selection of the appropriate substate depends on the GPRS update status, see subclause 4.1.3.2, and on the selected cell. 4.1.3.1.2.1 GMM-DEREGISTERED.NORMAL-SERVICE Valid subscriber data is available, a suitable cell has been found and the PLMN or LA is not in the forbidden list. In this state, a request for GPRS attach is performed using the stored temporary mobile subscriber identity for GPRS (P-TMSI), routing area identification (RAI) and GPRS ciphering key sequence number in case of GU1. If the GPRS update status is GU2, the IMSI shall be used to attach for GPRS services. 4.1.3.1.2.2 GMM-DEREGISTERED.LIMITED-SERVICE Valid subscriber data is available, and a cell is selected, which is known not to be able to provide normal service. 4.1.3.1.2.3 GMM-DEREGISTERED.ATTACH-NEEDED Valid subscriber data is available and for some reason a GPRS attach must be performed as soon as possible. This state is usually of no duration, but can last, e.g. due to access class control (see subclause 4.1.1.2.1). 4.1.3.1.2.4 GMM-DEREGISTERED.ATTEMPTING-TO-ATTACH A cell is selected, a previous GPRS attach was rejected or failed due to a missing response from the network. The execution of further attach procedures depends on the GPRS attach attempt counter. No GMM procedure except GPRS attach shall be initiated by the MS in this substate. 4.1.3.1.2.5 GMM-DEREGISTERED.NO-IMSI No valid subscriber data is available (no SIM/USIM, or the SIM/USIM is not considered valid by the ME) and a cell has been selected. 4.1.3.1.2.6 GMM-DEREGISTERED.NO-CELL-AVAILABLE No cell can be selected. This substate is entered after a first intensive search failed (substate PLMN SEARCH). Cells are searched for at a low rhythm. No services are offered. 4.1.3.1.2.7 GMM-DEREGISTERED.PLMN-SEARCH The mobile station is searching for PLMNs. This substate is left either when a cell has been selected (the new substate is NORMAL-SERVICE or LIMITED-SERVICE) or when it has been concluded that no cell is available at the moment (the new substate is NO-CELL-AVAILABLE). 4.1.3.1.2.8 GMM-DEREGISTERED.SUSPENDED (A/Gb mode only) The MS shall enter this substate when entering dedicated mode and the MS limitations make it unable to communicate on GPRS channels. The MS shall leave this substate when leaving dedicated mode.