In 5G NR, the system information is consist of MIB and the number of SIBs, which is divided into two groups i.e. Minimum System Information (MSI) and other system information (OSI)
Minimum SI ( MSI )
- Basic information required for initial access and information for acquiring any other SI. Minimum SI consists of:
- MIB contains cell barred status information and essential physical layer information of the cell required to receive further system information, e.g. CORESET#0 configuration.
- SIB1 defines the scheduling of other system information blocks and contains information required for initial access.
- SIB1 is also referred to as Remaining Minimum SI (RMSI) and is periodically broadcast on DL-SCH (Transport Channel) or sent in a dedicated manner on DL-SCH(Transport Channel) to UEs in RRC_CONNECTED .
- SIBs are mapped from BCCH to DLSCH and DLSCH to PDSCH channels.
Other SI ( OSI )
- All SIBs are not broadcast in the MSI.
- Those SIBs can either be periodically broadcast on DL-SCH, broadcast on-demand on DL-SCH (i.e. upon request from UEs in RRC_IDLE or RRC_INACTIVE), or
- sent in a dedicated manner on DL-SCH to UEs in RRC_CONNECTED.
- Other SI consists of SIB2, SIB3, SIB4, SIB5, SIB6, SIB7, SIB8, SIB9.
MIB
- MIB stands for Master Information Block
- MIB is always mapped on BCCH (Logical channel) and carried on BCH (Transport channel), then BCH( Transport channel) is mapped on PBCH (Physical channel)
- The MIB is transmitted with the periodicity of 80 ms & Repetition made with 80 ms
- MIB includes parameters that are needed to acquire SIB1 from the cell
- Repetitions are scheduled to the period of SSB
- The size of MIB is 24-bit information
SIB1
- SIB1 stands for System Information Block 1
- SIB1 contains information relevant when evaluating –
- if a UE is allowed to access a cell and defines the scheduling of other system information.
- It also contains radio resource configuration information that is common for all UEs
- The barring information applied to the unified access control.
- SIB1 is transmitted with a periodicity of 160 ms and variable transmission repetition periodicity within 160 ms
- The default transmission repetition periodicity of SIB1 is 20 ms but the actual transmission repetition periodicity is up to network implementation
SIB2
- SIB2 stands for System Information Block 2
- SIB2 contains cell re-selection information common for intra-frequency, inter-frequency and/or inter-RAT cell re-selection (i.e. applicable for more than one type of cell re-selection but not necessarily all) as well as intra-frequency cell re-selection information other than neighbouring cell related.
SIB3
- SIB3 stands for System Information Block 3
- SIB3 contains neighbouring cell related information relevant only for intra-frequency cell re-selection. The IE includes cells with specific re-selection parameters as well as blacklisted cells.
SIB4
- SIB4 stands for System Information Block 4
- SIB4 contains information relevant only for inter-frequency cell re-selection i.e. information about other NR frequencies and inter-frequency neighbouring cells relevant for cell re-selection.
- The IE includes cell re-selection parameters common for a frequency as well as cell specific re-selection parameters.
SIB5
- SIB5 stands for System Information Block 5
- SIB5 contains information relevant only for inter-RAT cell re-selection i.e. information about E-UTRA frequencies and E-UTRAs neighbouring cells relevant for cell re-selection.
- The IE includes cell re-selection parameters common for a frequency.
SIB6
- SIB6 stands for System Information Block 6
- SIB6 contains an ETWS primary notification
SIB7
- SIB7 stands for System Information Block 7
- SIB7 contains an ETWS secondary notification
SIB8
- SIB8 stands for System Information Block 8
- SIB8 contains a CMAS notification
SIB9
- SIB9 stands for System Information Block 9
- SIB9 contains information related to GPS time and Coordinated Universal Time (UTC).
- The UE may use the parameters provided in this system information block to obtain the UTC, the GPS and the local time
References
3GPP 38.300
3GPP 38.331
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