system information block with IEs

1. System Information Blocks
(SIBs) in LTE
Михаил Якимов

2. SIB 1 - cell access and scheduling of other system
information (1)
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 aupported 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.

3. SIB 1 (2)
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.

4. SIB 2 - radio resource configuration information (1)
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

5. SIB 2 (2)
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

6. SIB 2 (3)
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

7. SIB3: Cell-reselection parameters for INTRA-Frequency,
INTER-Frequency and Inter-RAT (1)
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.

8. SIB3 (2)
intraFreqCellReselectionIn
fo
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

9. SIB4: Cell-reselection parameters for Neighbouring INTRA-
Frequency
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)
intraFreqNeighCellList
[1-16 instances]
List of intra-frequency neighbouring cells with specific cell re-
selection parameters

10. SIB5: Cell-reselection parameters for INTER-Frequency
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: signalled 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 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
# Cell re-selection is allowed only when Srxlev of the candiate cell is greater then
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 Abolute priority of the frequency layer
neighCellConfig information regarding the neighbouring 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

11. SIB6: Cell-reselection parameters INTER RAT Frequency
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

12. SIB7: Cell-reselection parameters INTER RAT Frequency
(GERAN)
t_ReselectionGERAN Time to trigger for reselection. Value 0 to 7 sec.
carrierFreqsInfoList[0] carries upto 16 instances of GERAN freq.
carrierFreqs
startingARFCN Start of the ARFCN
bandIndicator dcs1800 or pcs1900
followingARFCNs ARFCN groups
cellReselectionPriority absolute priority of the GERAN layer. Value 0 to 7, whereas 0 is the lowest priority
ncc_Permitted Network Color Code. Is a bitmap value
q_RxLevMin minimum RSSI value required
p_MaxGERAN maximum allowed UL transmit power
threshX_High
# Threshold (in dB) used by UE for cell re-selection to a HIGHER priority 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 frequency
# Cell re-selection is allowed only when Srxlev of the candiate cell is greater then
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

13. SIB9: Home eNB name
hnb-Name Carries the name of the home eNB

14. SIB10: ETWS primary notification
messageIdentifier
Identifies the source and type of ETWS notification (earthquake,
tsunami warning, any emergency or test message)
serialNumber
Identifies variations of an ETWS notification.
-uses various mechanisms to alert the user (display message, play a
tone or vibrate, location where the message is applicable, also
contains an update number which specifies whether a change is in
the message content or not)
warningType
# Identifies the warning type of the ETWS primary notification
(earthquake, tsunami, etc.) and
# provides information on emergency user alert and UE popup
warningSecurityInfo
# is optional, only applied when security is applied
# Provides security information for the ETWS notification

15. SIB11: ETWS secondary notification
messageIdentifier
Identifies the source and type of ETWS notification (earthquake,
tsunami warning, any emergency or test message)
serialNumber
Identifies variations of an ETWS notification.
-uses various mechanisms to alert the user (display message, play a
tone or vibrate, location where the message is applicable, also
contains an update number which specifies whether a change is in
the message content or not)
warningMessageSegmentType
[last/not last]
Indicates whether the included ETWS warning message segment is
the last segment of the complete segment or not
warningMessageSegmentNumber
# allows oedering of the message segments
# Segment number of the ETWS warning message segment contained
in the SIB. A segment number of zero corresponds to the first
segment, one corresponds to the second segment, and so on
warningMessageSegment carries actual segment of the message
dataCodingScheme
Identifies the alphabet/coding and the language applied variations of
an ETWS notification

16. SIB12: CMAS notification
messageIdentifier Identifies the source and type of CMAS notification
serialNumber Identifies variations of a CMAS notification
warningMessageSegmentType
Indicates whether the included CMAS warning message
segment is the last segment or not
warningMessageSegmentNumber
Segment number of the CMAS warning message segment
contained in the SIB. A segment number of zero
corresponds to the first segment, one corresponds to the
second segment, and so on
warningMessageSegment Carries a segment of the Warning Message
dataCodingScheme
Identifies the alphabet/coding and the language applied
variations of a CMAS notification

17. SIB13: MBMS control information
 Contains the information required to acquire
the MBMS control information associated
with one or more MBSFN areas
• mbsfn-AreaInfoList