System Information Block -5 in LTE (SIB-5)

 Ø  Contains information relevant only for inter-frequency cell re-selection i.e. information about other E‑UTRA frequencies and inter-frequency neighboring cells relevant for cell re-selection

 Ø  Includes cell re-selection parameters common for a frequency as well as cell specific re-selection parameters

Information’s:

InterFreqCarrierFreqInfo	can be specified upto 8 carrier frequencies
dl-CarrierFreq	carrier frequency helps the UE to search the cells
q-RxLevMin	Minimum RSRP value of the inter-frequency cell. Value -70 to -22 dBm. Actual value: signaled value * 2
p-Max	maximum allowed UL transmit power of the cell
t-ReselectionEUTRA	Defines the time to trigger for cell reselection. Value 0 to 7 sec.
t-ReselectionEUTRA-SF	scaling factors for Medium and High mobility
threshX-High	# Threshold (in dB) used by UE for cell re-selection to a HIGHER priority #  The Srxlev of the candiate cell is greater than threshX_High # Value 0 to 31 dB. Actual value= Signaled value * 2
threshX-Low	# Threshold (in dB) used by UE for cell re-selection to a LOWER priority #  Cell re-selection is allowed only when Srxlev of the candiate cell is greater than threshX_Low and RSRP of serving cell is less than the value of ThreshServingLow singalled within SIB3 # Value 0 to 31 dB. Actual value= Signaled value * 2
allowedMeasBandwidth	defined in terms of Resouce blocks associated with a specific channel bandwidth
cellReselectionPriority	defines the priority of the frequency layer
neighCellConfig	information regarding the neighboring cells
q-OffsetFreq	defines the RSRP measurement offset, applied to all cells on the specified RF carrier
interFreqBlackCellList	the mentioned cells are no considered for cell reselection

System Information Block -4 in LTE (SIB-4)

 Ø  Contains neighboring cell related information relevant only for intra-frequency cell re-selection

 Ø  Includes cells with specific re-selection parameters as well as blacklisted cells

 Ø  All the contents of SIB4 are optional because UE's can automatically detect and complete neighbor INTRA_frequency cells

Information’s:

intraFreqNeighCellList [1-16 instances]	List of intra-frequency neighbouring cells with specific cell re-selection parameters
IntraFreqNeighCellInfo
physCellId	Physical CellID of the neighbour cell
q-OffsetCell	specifies the offset between the two cells. Value -24 - +24dB
intraFreqBlackCellList [1-16 instances]	List of blacklisted intra-frequency neighbouring cells. These type of cells are not considered for cell re-selection
csg_PhysCellIdRange	Set of physical cell identities reserved for CSG cells on the frequency on which this field was received. The received csg-PhysCellIdRange applies if less than 24 hours has elapsed since it was received and it was received in the same primary PLMN. This field is Optional (mandatory for CSG cell)

System Information Block -3 in LTE (SIB-3)

 Ø  contains Cell re-selection information common for intra-frequency, inter-frequency and inter-RAT cell re-   selection (i.e. applicable for more than one type of cell re-selection but not necessarily all)

 Ø  intra-frequency cell re-selection information other than neighbouring cell related

Information’s:

cellReselectionInfoCommon	Cell re-selection information common for cells
q_Hyst	This specifies the hysteresis value for cell re-selection ranking criteria. The specified value is added to the serving cell RSRP measurement.
speedStateReselectionPars	Speed dependent reselection parameters. If this field is absent then mobility State Parameters is not present. If q_hystSF is present then it is added to q_hyst. Carrier (-) value so as to reduce the ranking of the serving cell and allows cellreselection to occur easily.
cellReselectionServingFreqInfo	Information for Cell re-selection to inter-frequency and inter-RAT cells
s_NonIntraSearch	#used to trigger Interfrequency and IRATfrequency measurements for cell reselection when: - TARGET Interfreq. has lower or equal priority - IRAT freq. has a lower priority # specifies the Srxlev threshold (in dB) for E-UTRAN inter-frequency and inter-RAT measurements. #If the field s-NonIntraSearchP is present, the UE applies the value of s-NonIntraSearchP. # Otherwise if neither s-NonIntraSearch nor s-NonIntraSearchP is present, the UE applies the (default) value of infinity for SnonIntraSearchP.
threshServingLow	This specifies the Srxlev threshold (in dB) below which the serving cell must fall before reselecting towards a lower priority RAT/ frequency. Value in between 0-31dB. Actual value=signalled value*2
cellReselectionPriority	explains the absolute priority of the concerned serving cell frequency /set of frequencies (GERAN)/ bandclass (CDMA2000), as used by the cell reselection procedure. Corresponds with parameter "priority". Value is between 0-7 where 0 means: lowest priority.
intraFreqCellReselectionInfo	Cell re-selection information common for intra-frequency cells
q_RxLevMin	Minimum required RSRP for cell reselection. value -70 - 22 dbm, Actual value=signalled value*2
s_IntraSearch	# used to trigger intrafreq. measurements # specifies the Srxlev threshold (in dB) for intra-frequency measurements. # If the field s-IntraSearchP is present, the UE applies the value of s-IntraSearchP instead. Otherwise if neither 09s-IntraSearch nor s-IntraSearchP is present, the UE applies the (default) value of infinity for SIntraSearchP.
presenceAntennaPort1	is used to09 indicate whether all the neighboring cells use 09Antenna Port 1.  When set to TRUE, the UE may assume that at least two cell-specific antenna ports are used in all neighboring cells.
neighCellConfig	used to provide the information related to MBSFN and TDD UL/DL configuration of neighbor cells.
t_ReselectionEUTRA	# specifies the cell reselection timer value # defines time to trigger for cell reselection # The parameter can be set per E-UTRAN frequency
p_Max	# max. allowed UL transmit power for intra-frequency neighboring E-UTRA cells. If absent the UE applies the maximum power according to the UE capability

System Information Block -2 in LTE (SIB-2)

 Ø  The IE SystemInformationBlockType2 contains radio resource configuration information that is common for all UEs.

 Ø  It carries Common and shared channel configuration, RACH related configuration, Timers, UL Power controls.

 Ø  Without this SIB UE cannot initiate ATTACH procedure.

 Ø  SIB2 is not specifically included in the scheduling information in SIB1 but it is always mapped to the SI message that corresponds to the first entry in the list of SI messages in schedulingInfoList in SIB1

Information’s:

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
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
powerRampingParameters
powerRampingStep	Power ramping factor
preambleInitialReceivedTargetPower	Initial preamble power
ra_SupervisionInfo
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
modificationPeriodCoeff	Actual modification period, expressed in number of radio frames= modificationPeriodCoeff * defaultPagingCycle. n2 corresponds to value 2
defaultPagingCycle	Default paging cycle, used to derive ‘T’. Value rf32 corresponds to 32 radio frames
nB	is used as one of parameters to derive the Paging Frame and Paging Occasion
prach_Config rootSequenceIndex	used to specify the PRACH configuration in the system information and in the mobility control information
prach_ConfigIndex	Specifies the: Preamble format: 0-4 (For frame structure 1 preamble format is 0-3 and for frame structure 2 it is 0-4) SFN: whether it will be EVEN no. frmae OR any frame subframe number: carrier the subframe no. within the SFN
highSpeedFlag	TRUE corresponds to Restricted set and FALSE to Unrestricted set
zeroCorrelationZoneConfig	used for Preamble generation
pdsch_Config	used to specify the common and the UE specific PDSCH configuration
pusch_Config	used to specify the common PUSCH configuration and the reference signal configuration for PUSCH and PUCCH
pucch_Config	used to specify the common and the UE specific PUCCH configuration
soundingRS_UL_Config	used to specify the uplink Sounding RS configuration
uplinkPowerControl	used to specify parameters for uplink power control in the system information and in the dedicated signaling
ue_TimersAndConstants	Timer values
freqInfo	UL carrier frequency and bandwidth
timeAlignmentTimerCommon	Used to control how long the UE is considered uplink time aligned. Value in subframes

System Information Block -1 in LTE (SIB-1)

SIB1 contents assist the UE when it is evaluating cell access and also defines the scheduling of other system information.

 Ø  SIB1 is broadcasted at every 80 ms and is repeated within 80ms 

 Ø  The first transmission is made at SubFrame 5 for which SFN mod 8 = 0

 Ø  Repetitions are scheduled in SubFrame 5 for which SFN mod 2 = 0

Information’s:

PLMN-Identity	Consists of MCC and MNC. The first listed one is the Primary PLMN
p-Max	Value applicable for the cell. If absent the UE applies the maximum power according to the UE capability. If eNB configures the value more than the value supported by the UE then UE will set the max value supported by the UE capability. Example UE Catagory 3 supports max 23 db
cellReservedForOperatorUse	As defined by operator (Reserved/Not_reserved)
trackingAreaCode	TAC which is common to the PLMN Identities
cellIdentity	Identifies a cell within the PLMN
cellBarred	If Barred then UE is not allowed to camp on the cell
intraFreqReselection	If enabled, UE will be able to perform Cell-reselection to INTRA-frequency cells
q_RxLevMin	Minimum required RX level in the cell
q_RxLevMinOffset	Actual value Qrxlevminoffset = IE value * 2 [dB]. Only applied when a cell is evaluated for cell selection as a result of a periodic search for a higher priority PLMN while camped normally in a VPLMN [5]. During this periodic search for higher priority PLMN the UE may check the S criteria of a cell using parameter values stored from a different cell of this higher priority PLMN. Affects the minimum required Rx level in the cell.
freqBandIndicator	indicates the E-UTRA operating band
schedulingInfoList	information regarding the presence of SIB type; other than SIB1
si_Periodicity	Periodicity of the SI-message in radio frames (SI will be transmitted within the specified radio frame)
sib_MappingInfo	Carries the List of the SIBs mapped. SIB2 is always present in the first element of schedulingInfoList
si_WindowLength	specifies that a SIB should be transmitted somewhere within the specified window length. Value is in ms. This window starts at the starting sub-frame of the mentioned si_periodicity. SIBs can be received in any of the sub-frame as mentioned in the WindowLength.
systemInfoValueTag	indicates if a change has occurred in the SI messages. UEs may use systemInfoValueTag, e.g. upon return from out of coverage, to verify if the previously stored SI messages are still valid. Additionally, the UE considers stored system information to be invalid after 3 hours from the moment it was successfully confirmed as valid, unless specified otherwise. Common for all SIBs other than MIB, SIB1, SIB10, SIB11 and SIB12.

System Information Block in LTE (SIB)

SIB’s	Details
SIB-1	Cell access related parameters and scheduling of other SIBs
SIB-2	Common and shared channel configuration, RACH related configuration are present
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)
SIB-5	Information regarding INTER-frequency neighboring cells (E-UTRA)
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.

Scenarios where UE acquire SIBs:

Ø   UE is powered on (selecting a cell)

Ø   Cell re-selection

Ø   After HO completion

Ø   After entering E-UTRAN from another RAT

Ø   coming out of OUT OF COVERAGE situation

Ø   receiving a notification that SYSTEM INFORMATION has changed

Ø   receiving an indication about the presence of ETWS (Primary/Secondary), CMAS notification

Ø   receiving a request from CDMA 2000 upper layers

Ø   exceeding the maximum validity duration of SIBs

LTE Call Flow