MIB (Master Information Block)
MIB – Master Information Block
Periodicity – 40 ms at RRC (10 ms at Physical Layer)
Location – 1st Subframe 2nd Time Slot First 4rth OFDM Symbol
Channel – PBCH
Information Elements (I.E)-
- SFN
- Number of Tx Antenna
- Bandwidth
- PHICH info
- PCID (Physical Cell ID)
SIB (System Information Block)
Types of SIB:
- SIB 1 : Cell Selection, Cell Access, SI Scheduling.
- SIB 2 : RACH, Access Barring, UL frequency Information, MBSFN Config.
- SIB 3 : Intra Frequency Cell Reselection.
- SIB 4 : Intra Frequency Neighbour Cell.
- SIB 5 : Inter Frequency Neighbour Cell.
- SIB 6 : UTRAN Neighbour Cell.
- SIB 7 : GERAN Neighbour Cell.
Note : SIBs other than SIB1 are carried in SI messages and mapping of SIBs to SI is done by “schedulingInfoList” List include in SIB1.
System Information Block Type1 (SIB 1)
- SIB1 : It contains information relevant when evaluating if a UE is allowed to access a cell and defines the scheduling of other system information.
- Its periodicity is of 80 ms and repetitions made within 80 ms.
SIB1 related information:
plmn-IdentityList : List of PLMN identities.
sib-MappingInfo : List of the SIBs mapped to this SI message. There is no mapping information of SIB2, it is always present in the first SI message listed in schedulingInfoList list.
si-Periodicity : Periodicity of the SI-message in radio frames.
Si-WindowLength: Common SI scheduling window for all SI’s.
trackingAreaCode : A trackingAreaCode that is common for all the PLMNs listed
systemInfoValueTag : indicates if a change has occurred in the SI messages.schedulingInfoList : The transmission cycles for other SIBs are determined
System Information Block Type2 (SIB 2)
- There is no mapping information of SIB2
- It is always present in the first System Information message listed in the schedulingInfoList list.
| Parameter | Description |
| ac-BarringInfo | Access Class Barring configuration |
| radioResourceConfig | used to specify common radio resource configurations in the system information and in the mobility control information |
| numberOfRA_Preambles | Number of non-dedicated random access preambles |
| Preambleintialreceivedtargetpower | |
| PowerRampingstep | |
| preamblesGroupAConfig_exist | Provides the configuration for preamble grouping. If the field is not signalled, the size of the random access preambles group A is equal to numberOfRA-Preambles |
| preambleTransMax | Maximum number of preamble transmission |
| ra_ResponseWindowSize | Duration of the RA response window. Value in subframes. Value sf2 corresponds to 2 subframes |
| mac_ContentionResolutionTimer | Timer for contention resolution. Value in subframes. Value sf8 corresponds to 8 subframes |
| maxHARQ_Msg3Tx 4 | Maximum number of Msg3 HARQ transmissions, used for contention based random access |
| prach_Config | used to specify the PRACH configuration in the system information and in the mobility control information |
| prach_ConfigIndex | Mentions Preamble format, SFN,subframe number |
System Information Block Type3 (SIB 3)
Direction: E-UTRAN => UE
RLC Mode: TM
Logical Channel: BCCH
Transport Channel: DL-SCH
The SIB3 contains cell re-selection information common for intra-frequency, inter-frequency and/or inter-RAT cell re-selection.
SIB3 also contains cell reselection priority information for the concerned carrier frequency or a set of frequencies
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