6.14 Use of MM system information
23.2213GPPArchitectural requirementsRelease 17TS
In each cell the network broadcasts MM system information on the broadcast channel. . The "current MM system information" is used by the MM functionality in the UE respecting the rules for the UE service state of the respective MM state machine, see clause 6.6. The "current MM system information" is identified as follows:
– In RRC idle mode, when the UE camps on one cell, it receives all MM system information valid for this cell on the broadcast channel of the cell. The received MM system information is then the "current MM system information";
– In UTRAN RRC connected mode, the SRNS shall control the current MM system information valid for the UE. e.g. at SRNS relocation, the new SRNS may send applicable MM system information to the UE. The established RRC connection shall be used for transferring any new MM system information to the UE. The UE shall use any new MM system information received from the SRNC on the established RRC connection as the "current MM system information";
NOTE: The MM system information need not necessarily be sent for every SRNSs relocation, nor does it prelude MM system information being sent on other occasions.
– In E-UTRAN RRC connected mode, the UE receives all MM system information valid for this cell on the broadcast channel of the cell. The received MM system information is then the "current MM system information";
– At the RRC connection establishment, the UE uses the broadcasted MM system information of the cell where the establishment is made as the "current MM system information";
– When the UE leaves the RRC connected mode and enters RRC idle mode, the UE uses the broadcasted MM system information of the chosen cell, which is determined by the UE idle mode cell selection/re-selection process that is then performed, as the "current MM system information".