Structure of System Information in UMTS Mobile Sysytem
System
information :
MIB
(Master Information Block )
SB
(Scheduling Block )
SIB (System Information
Block )
System information is used for the network to broadcast network information to UEs camping
on a cell so as to control the behavior of UEs.
- MIB
- When selecting a new cell, the UE reads the MIB. The UE may locate the MIB by
predefined scheduling information. The IEs in the MIB includes MIB value tag, PLMN
type, PLMN identity, reference and scheduling information for a number of SIBs in a
cell or one or two SBs in a cell.
- SB
- Scheduling Block (SB) gives reference and scheduling information to other SIBs. The
scheduling information of a SIB may be included in only one of MIB and SB.
- SIB
- System Information Block (SIB) contains actual system information. It consists of
system information elements (IEs) with the same purpose.
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And below the details for every SIB:
SIB1: Contains the system information for NAS and the
timer/counter for UE
- SIB2: Contains the URA information
- SIB3: Contains the parameters for
cell selection and cell reselection
- SIB5: Contains parameters for the
common physical channels of
the cell
-SIB7: Contains the uplink interference level and the
refreshing
timer for SIB7
- SIB11:
Contains measurement controlling information
-SIB4:
Contains parameters for cell selection and cell re-selection while UE is in
connected
mode
- SIB6: Contains parameters for the common physical channels of the cell
while UE is in
connected
mode
-SIB8: Contains
the CPCH static information
- SIB9: Contains the CPCH dynamic information
-SIB10:
Contains information to be used by UEs having their DCH controlled by a DRAC
procedure.
Used in FDD mode only. To be used in CELL_DCH state only. Changes so often,
its
decoding is controlled by a timer
- SIB12: Contains measurement controlling information in connecting mode
-SIB13: Contains
ANSI-41 system information
- SIB14: Contains the information in TDD mode
-SIB15:
Contains the position service information
- SIB16: Contains the needed pre-configuration information for handover
from other RAT to
UTRAN
-SIB17:
Contains the configuration information for TDD
-SIB18:
Contains the PLMN identities of the neighboring cells
- To be used in shared networks to help with the
cell reselection process
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