MIB and SIB

What is Difference between MIB and SIB?

MIB and SIM are two types of System Information (SI) that is broadcasted in the serving are of particular cell. SI is carried by the logical channel BCCH, which in turn is carried by either of the transport channels BCH or DL-SCH.

Master information Block (MIB): is a static part of SI and contain information like number of antennas, system bandwidth,PHICH configuration, transmitted power and scheduling information on how the SIBs are scheduled together with other data on DL-SCH. MIB is transmitted on the BBCH–> PBCH with periodicity of every 40 ms.

System Information Block (SIB): is a dynamic part of SI. It carry relevant information for the UE, which helps UE to access a cell, perform cell re-selection, information related to INTRA-frequency, INTER-frequency and INTER-RAT cell selections. It is mapped on DL-SCH –>PDSCH with periodicity of every 80 ms, 160ms or 320ms for SIB1,SIB2 and SIB3 respectively.

How many types of SIBs are available in LTE?

There are 13 types of SIBs for LTE.

 What does SIB1/SIB2/ … /SIB13 do?

Each SIB carry information related to specific tasks.

SIB-1 Carries Cell access related parameters like cell ID, MCC, MNC, TAC, scheduling of other SIBs
SIB-2 Carries Common and shared channel configuration, RACH related configuration are present; RRC, uplink power control, preamble power ramping, uplink Cyclic Prefix Length, sub-frame hopping, uplink EARFCN
SIB-3 Parameters required for intra-frequency, inter-frequency and I-RAT cell re-selections
SIB-4 Information regarding INTRA-frequency neighboring cells (E-UTRA)  carries serving cell and neighbor cell frequencies required for cell reselection as well handover
SIB-5 Information regarding INTER-frequency neighboring cells (E-UTRA); carries E-UTRA LTE frequencies, other neighbor cell frequencies from other RATs.
SIB-6 Information for re-selection to INTER-RAT (UTRAN cells)
SIB-7 Information for re-selection to INTER-RAT (GERAN cells)
SIB-8 Information for re-selection to INTER-RAT (CDMA2000)
SIB-9 Information related to Home eNodeB  (FEMTOCELL)
SIB-10 ETWS (Earthquake and Tsunami Warning System) information (Primary notification)
SIB-11 ETWS (Earthquake and Tsunami Warning System) information (Secondary notification)
SIB-12 Commercial Mobile Alert Service (CMAS) information.
SIB-13 Contains the information required to acquire the MBMS control information associated with one or more MBSFN areas.

Explore below link to know more about earch and every SIB,

http://www.rfwireless-world.com/Terminology/LTE-MIB-SIB-system-information-blocks.html
On which channels SIBs are transmitted?

BCCH–> DL-SCH–> PDSCH.
Which SIBs are essential?

In LTE, for a UE to access the eNB, at the most minimum 2 SIBs are required (SIB1 and SIB2). Information regarding SIB2-SIB13 are carried in SI messages and are included in schedulingInfoList which is part of SIB1.

Why we need SIB19?
SIB 19 is needed when UE is coming back from 3G to 4G. LTE priority should be set high in 3G. SIB19 carries the absolute priority of the serving UMTS cell, the absolute priorities of the LTE frequencies, and the cell reselection thresholds.

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