LTE system information blocks-MIB,SIB-1,2,3,4,5,6,7,8,9,10,11
The system information is very essential and the same is broadcasted by LTE eNB over logical channel BCCH. This logical channel information is further carried over transport channel BCH or carried by DL-SCH.
There are two parts in SI static part and dynamic part. Static part is called as MIB and is transmitted using BCH and carried by PBCH once every 40ms. MIB carries useful information which includes channel bandwidth, PHICH configuration details; transmit power, no. of antennas and SIB scheduling information transmitted along with other information on the DL-SCH.
Dynamic part is called as SIB and is mapped on RRC SI messages(SI-1,2,3,4,5,6,7,8,9,10,11) over DL-SCH and transmitted using PDSCH at periodic intervals. SI-1 transmitted every 80ms, SI-2 every 160ms and SI-3 every 320 ms.
System Information Blocks are grouped in SI containers. Each SI is composed of multiple SIBs. Each SI usually will have different transmission frequency and will be sent in a single sub-frame. SIBs are transmitted using BCCH mapped on DL-SCH which in turn mapped on PDSCH.
System information will be changed every BCCH modification period. Signalling Tester model MD8430A from Anritsu can be used as LTE Base Station Emulator. This will emulate LTE MIBs and SIBs over corresponding LTE channels.
| LTE system information blocks | Description |
|---|---|
| MIB | Carries physical layer information of LTE cell which in turn help receive further SIs, i.e. system bandwidth |
| SIB1 | Contains information regarding whether or not UE is allowed to access the LTE cell. It also defines the scheduling of the other SIBs. carries cell ID, MCC, MNC, TAC, SIB mapping. |
| SIB2 | Carries common channel as well as shared channel information. It also carries RRC, uplink power control, preamble power ramping, uplink Cyclic Prefix Length, sub-frame hopping, uplink EARFCN |
| SIB3 | carries cell re-selection information as well as Intra frequency cell re-selection information |
| SIB4 | carries Intra Frequency Neighbors(on same frequency); carries serving cell and neighbor cell frequencies required for cell reselection as well handover between same RAT base stations(GSM BTS1 to GSM BTS2) and different RAT base stations(GSM to WCDMA or GSM to LTE or between WCDMA to LTE etc.) . Covers E-UTRA and other RATs as mentioned |
| SIB5 | Carries Inter Frequency Neighbors(on different frequency); carries E-UTRA LTE frequencies, other neighbor cell frequencies from other RATs. The purpose is cell reselection and handover. |
| SIB6 | carries WCDMA neighbors information i.e. carries serving UTRA and neighbor cell frequencies useful for cell re-selection |
| SIB7 | carries GSM neighbours information i.e. Carries GERAN frequencies as well as GERAN neighbor cell frequencies. It is used for cell re-selection as well as handover purpose. |
| SIB8 | carries CDMA-2000 EVDO frequencies, CDMA-2000 neighbor cell frequencies. |
| SIB9 | carries HNBID (Home eNodeB Identifier) |
| SIB10 | carries ETWS prim. notification |
| SIB11 | carries ETWS sec. notification |
LTE System Information Block (SIB) Contents
Following dropdown menu will help one browse through all the LTE system information block contents. It covers LTE SIB-1, SIB-2, SIB-3, SIB-4, SIB-5, SIB-6, SIB-7, SIB-8, SIB-9, SIB-10 and LTE SIB-11.
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