SIB7 in LTE

SIB7: Cell-reselection parameters INTER RAT Frequency (GERAN)

• contains information relevant only for inter-RAT (GERAN) cell re-selection 

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

 

Important contents of SystemInformationBlockType7

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