System Information Block Type 6 or with abbreviated version SIB6 contains UTRAN frequency related information and relevant only for cell re-selection from LTE to WCDMA. The message includes frequencies with specific re-selection parameters. SIB6 is transmitted from the network to UE through BCCH -> DL-SCH -> PDSCH channels.
Here the list of carried information from the network to UE through SIB6:
Carrier Freq List UTRA-FDD: contains information about UTRA FDD frequency carriers relevant for inter-RAT cell re-selection from E-UTRA to UTRAN FDD.
DL Carrier Freq: indicates the DL UARFCN of the neighboring cell on the UTRAN frequency.
Cell Reselection Priority: indicates the cell reselection priority of the neighboring UTRAN frequency. The value 0 indicates the lowest priority.
threshX-High: UTRAN high priority threshold, the threshold used when reselecting from a lower priority LTE frequency to higher priority UTRAN frequency. Actual value in dB is obtained by multiplying by 2.
threshX-Low: UTRAN lower priority threshold, the threshold used when reselecting from a higher priority LTE frequency to lower priority UTRAN frequency. Actual value in dB is obtained by multiplying by 2.
q-RxLevmin: required minimum received RSCP level on this UTRA frequency carrier. Actual value in dBm is obtained by multiplying by 2 plus 1.
q-QualMin: minimum quality level (EcNo) required for a cell on the UTRAN frequency to become a candidate for reselection.
p-MaxUTRA: this parameter is used to limit the allowed UE uplink transmission power on this UTRA FDD carrier frequency.
t-ReselectionUTRA: indicates the evaluation period for a UE to determine whether to reselect a neighboring UTRAN cell to camp on.
sf-Medium: specifies scaling factor for t-ReselectionUTRA for inter-RAT reselection to UTRA in Medium-mobility state. Value oDot25 corresponds to 0.25, oDot5 corresponds to 0.5 etc.
sf-High: specifies scaling factor for t-ReselectionUTRA for inter-RAT reselection to UTRA in High-mobility state. Value oDot25 corresponds to 0.25, oDot5 corresponds to 0.5 etc.
SIB6 carried information:
Example for SIB6, taken from drive-test tool:
systemInformation[0]BCCH-DLSCH-Message=
message = c1 = systemInformation =
criticalExtensions = systemInformation-r8 =
sib-TypeAndInfo = SEQUENCE OF CHOICE
CHOICE(1) = sib6 =
carrierFreqListUTRA-FDD = SEQUENCE OF
CarrierFreqUTRA-FDD (0) =
carrierFreq = 10787
cellReselectionPriority = 4
threshX-High = 2
threshX-Low = 1
q-RxLevmin = -58
p-MaxUTRA = 24
q-QualMin = -22
CarrierFreqUTRA-FDD (1) =
carrierFreq = 10787
cellReselectionPriority = 3
threshX-High = 6
threshX-Low = 6
q-RxLevmin = -58
p-MaxUTRA = 24
q-QualMin = -18
t-ReselectionUTRA = 1
t-ReselectionUTRA-SF
sf-Medium : lDot0
sf-High : oDot75
* Note: there are some parameters which might not be seen in the message list from drive-test tool, so it means this parameter was not configured in the network by the engineers.