Section: 5.2.2.4 Substate when back to state EMM-DEREGISTERED from another EMM state
Content: When returning to state EMM-DEREGISTERED, the UE shall select a cell as specified in 3GPP TS 36.304[ Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) procedures in idle mode ]  [21]. The substate depends on the result of the cell selection procedure, the outcome of the previously performed EMM specific procedures, on the EPS update status of the UE, on the tracking area data stored in the UE, on the presence of the USIM, on the UE configuration and on the reason for moving to EMM-DEREGISTERED: - If no cell has been found, the substate is NO-CELL-AVAILABLE, until a cell is found. - If no USIM is present or if the inserted USIM is considered invalid by the UE, the substate shall be NO-IMSI. - If a suitable cell has been found and the PLMN or tracking area is not in the forbidden list, the substate shall be NORMAL-SERVICE. - If an attach shall be performed (e.g. network requested re-attach), the substate shall be ATTEMPTING-TO-ATTACH. - If a PLMN reselection (according to 3GPP TS 23.122[ Non-Access-Stratum (NAS) functions related to Mobile Station (MS) in idle mode ]  [6]) is needed, the substate shall be PLMN-SEARCH. - If the selected cell is known not to be able to provide normal service, the substate shall be LIMITED-SERVICE; - If the selected cell is a non-3GPP cell, the substate shall be NO-CELL-AVAILABLE; and - If the UE is configured for eCall only mode as specified in 3GPP TS 31.102[ Characteristics of the Universal Subscriber Identity Module (USIM) application ]  [17], T3444 and T3445 have expired or are not running, and substate PLMN-SEARCH is not required, the substate shall be eCALL-INACTIVE.