Reselection from 4G to 3G
Set from LTE side
Parameter
QrxLevmin (LTE)
Snonintrasearch
Value TDD
-128
18
Threshold Serving
low
Value FDD
-120
8
10
QrxLevmin (3G)
-116
-116
Theshold x Low
LTE (7) , 3G
(5,4,3)
LTE (7) , 3G
(5,4,3)
1sec
1sec
Reselection Priority
Time to Trigger
Description
Indicates the minimum required Rx
Indicates the measurement trigger
threshold for reselection to inter-fre
inter-RAT cells
Indicates the threshold used in the
of reselection to a cell on a lower p
UTRAN frequency (UTRAN)
Indicates the minimum quality leve
for a cell on the UTRAN frequency t
candidate for reselection
Indicates the minimum RX level req
neighboring cell on the UTRAN freq
become a candidate for reselection
Indicates the cell reselection priorit
neighboring UTRAN frequency. The
indicates the lowest priority
Indicates the evaluation period for
determine whether to reselect a UT
camp on.
Equation
RSRP_Serv< QrxLevmin+ Threshold Serving low
AND
RSCP_Tar> QrxLevmin+ Theshold x Low
TDD
Reselect to 3G when Serving LTE is lower than
FDD
Reselect to 3G when Serving LTE is lower than
Reselection from 3G to 4G
Set from UMTS side
-118
and Target 3G is better than
-111
-112
and Target 3G is better than
-111
Parameter
Qrxlevmin (LTE)
Value TDD
-114
Thresh x high
Value FDD
-108
Description
Minimum required Rx Level on the po
cell to be become a candidate for res
Added to the QrxLevmin
Equation
RSRP_Targ(LTE)> Qrxlevmin+ Thresh x high
TDD
Reselect to 4G when Target 4G is higher than
FDD
Reselect to 4G when Target 4G is higher than
-114
-108
Redirection from 4G to 3G
Set from LTE side
Parameter
A1 Event RSRP (Stop
Value TDD
Value FDD
-137
-104
Description
Indicates the RSRP threshold for inte
Measurement)
A2 Event Start
Measurement
A2 Hysteresis
Time to Trigger
Blind Redirection offset
B1
-141
-110
640ms
480ms
-103
-103
measurement event A1. When the m
RSRP value of the serving cell excee
threshold, an event A1 report will be
Indicates the RSRP threshold for inte
measurement event A2.
When the measured RSRP value of t
cell is below this threshold, an event
will be sent
Indicates the hysteresis for inter-RAT
measurement events A1 and A2. Thi
parameter is used to prevent freque
triggering of event evaluation cause
signal fluctuation
When detecting that the signal quali
serving cell meets the entering cond
UE does not send a measurement re
eNodeB immediately. Instead, the UE
report only when the signal quality c
meets the entering condition during
to-trigger.
Indicates the offset of the event A2 t
for inter-RAT blind redirections relativ
event A2 threshold for handovers.
Indicates the RSCP threshold for eve
related to coverage-based inter-RAT
to UTRAN.
This parameter specifies the require
RSCP of the target UTRAN cell
B1 Hysteresis
Time to Trigger
640ms
640ms
Indicates the hysteresis for event B1
inter-RAT handover to UTRAN
Indicates the time-to-trigger for even
related to inter-RAT handover to UTR
Equation
Starting Meas Criterion:
RSRP_Serv <A2-Hys
Triggering Redirection (B1)
RSCP_Lev > Thresh (B1)+ Hys
OR
RSRP_Serv <A2-Hys-Blind Redirection offset
TDD
Start UTRAN Measurement when A2 Criteria met at
-104
-143
do Redirection when UTRAN RSCP be
-108
do Redirection when UTRAN RSCP be
FDD
Start UTRAN Measurement when A2 Criteria met at
-104
CSFB
Event based: Release LTE with UTRAN frequency list with Priorities.
