SIB6 in LTE

SIB6: Cell-reselection parameters INTER RAT Frequency

• contains information relevant only for inter-RAT cell re-selection (information about UTRA frequencies and UTRA neighbouring cells relevant for cell re-selection.
• includes cell re-selection parameters common for a frequency

Signalling radio bearer: N/A
RLC-Mode: TMLogical channel: BCCH
Direction: E‑UTRAN to UE

Important contents of SystemInformationBlockType6

carrierFreqListUTRA_FDD/TDD
    carrierFreq
    cellReselectionPriority
    threshX_High
    threshX_Low
    q_RxLevMin
    p_Max
    q_QualMin
t_ReselectionUTRA
t_ReselectionUTRA_SF
    SF_Medium
    SF_High

Field Descriptions:

carrierFreqListUTRA_FDD/TDD	Information specified for up to 16 instances of RF carriers for FDD or TDD
carrierFreq	carrier frequency helps the UE to seach
cellReselectionPriority	defines the absolute priority of the UMTS. Value 0-7, 0 is the lowest priority
threshX_High	# Threshold (in dB) used by UE for cell re-selection to a HIGHER priority UMTS frequency #  The Srxlev of the candiate cell is greater then 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 UMTS frequency #  Cell re-selection is allowed only when Srxlev of the candiate cell is greater then threshX_Low and RSR of serving cell is less than the value of ThreshServingLow singalled within SIB3 # Value 0 to 31 dB. Actual value= Signaled value * 2
q_RxLevMin	minimum RSCP requirement for candiate UMTS cell. Value -60 to -13 dB. Actual value= Signaled value * 2 +1
p_Max	Value applicable for the intra-frequency neighbouring E-UTRA cells. If absent the UE applies the maximum power according to the UE capability
q_QualMin	# minimum Ec/Io requirement for candiate UMTS cell. Value -24 to 0 dB # applicable for FDD only
t_ReselectionUTRA	# defines the time to trigger cell re-selection # value 0 - 7 seconds
t_ReselectionUTRA_SF	# defines the time to trigger cell re-selection # value 0 - 7 seconds # Scaling factors used for Medium and High mobility # Scaling Factors value 0.25, 0.5, 0.75, 1.0. These values decrease the value of T_reselection which allows more rapid cell re-selections

SIB4 in LTE

SIB4: Cell-reselection parameters for Neighbouring INTRA-Frequency

• contains neighbouring cell related information relevant only for intra-frequency cell re-selection
• includes cells with specific re-selection parameters as well as blacklisted cells
• All the contents of SIB4 are optional because UE's can automatically detect and complete neighbour INTRA_frequency cells

Signalling radio bearer: N/A
RLC-Mode: TM
Logical channel: BCCH
Direction: E‑UTRAN to UE

Important contents of SystemInformationBlockType4
intraFreqNeighCellList
      physCellId
      q-OffsetCell
intraFreqBlackCellList
     physCellId Range
Cellcsg_PhysCellId
     physCellId Range

Field Descriptions:

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)

SIB3 in LTE

SIB3: Cell-reselection parameters for INTRA-Frequency, INTER-Frequency and Inter-RAT

• 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)
• intra-frequency cell re-selection information other than neighbouring cell related

Signalling radio bearer: N/A
RLC-Mode: TM
Logical channel: BCCH
Direction: E‑UTRAN to UE

Important contents of SystemInformationBlockType3
cellReselectionInfoCommon   q_Hyst
     speedStateReselectionPars_exist
cellReselectionServingFreqInfo   s_NonIntraSearch
     threshServingLow
     cellReselectionPriority
intraFreqCellReselectionInfo   q_RxLevMin
     s_IntraSearch
     presenceAntennaPort1
neighCellConfig
p_Max

Field Descriptions:

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 neighbouring 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 neighbouring cells.
neighCellConfig	used to provide the information related to MBSFN and TDD UL/DL configuration of neighbour 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 neighbouring E-UTRA cells. If absent the UE applies the maximum power according to the UE capability

SIB2 in LTE

SIB-2: an IMPORTANT SIB

• The IE SystemInformationBlockType2 contains radio resource configuration information that is common for all UEs.
• It carries Common and shared channel configuration, RACH related configuration, Timers, UL Power controls.
• Without this SIB UE cannot initiate ATTACH procedure.
• 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

Signalling radio bearer: N/A
RLC-Mode: TM
Logical channel: BCCH
Direction: E‑UTRAN to UE  

Important contents of SystemInformationBlockType2
rach_ConfigCommon
radioResourceConfigCommon
  numberOfRA_Preambles
    preamblesGroupAConfig_exist
    powerRampingParameters
    powerRampingStep
    preambleInitialReceivedTargetPower
    ra_SupervisionInfo
    preambleTransMax
    ra_ResponseWindowSize
  mac_ContentionResolutionTimer
  maxHARQ_Msg3Tx 4
bcch_Config
pcch_Config
prach_Config
pdsch_ConfigCommon
pusch_ConfigCommon
pucch_ConfigCommon
soundingRS_UL_ConfigCommon
uplinkPowerControlCommon
ue_TimersAndConstants
freqInfo
timeAlignmentTimerCommon   

Field Descriptions:

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
bcch_Config
modificationPeriodCoeff	Actual modification period, expressed in number of radio frames= modificationPeriodCoeff * defaultPagingCycle. n2 corresponds to value 2
pcch_Config
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	used to specify the PRACH configuration in the system information and in the mobility control information
rootSequenceIndex
prach_ConfigIndex	mentions 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 (Look for the table in TS36.211 - Table 5.7.1-2)
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 signalling
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