Yossi Verona ‹#› LTE HO Strategy Features KPIs

main parameters for camping:
qRxLevMin (RSRP) = -140dBm
qQualMin (RSRQ) = -33dB

types of Intra-LTE HO:
Intra-RBS
X2 Inter-RBS
S1 Inter-RBS

need to define Intra frequency neighbors:
By default, UE in the

LTE network detects suitable neighbor cells, without the assistance of a list of neighbor cells sent by the serving RBS.

=0

=3dB

=1dB

= RSRP

= Both

=40ms

=0

=480ms

allow LTE to WCDMA mobility the following feature should be

activated in the eNB:
Coverage-Triggered WCDMA Session Continuity

Mode
By activating the feature “Coverage-Triggered WCDMA Session Continuity” the creation

and transmission of SIB6 in the eNB is enabled.
SIB6 contains information and parameters required by the UE to perform idle mode reselection to the WCDMA network.
No need to define specific WCDMA cells Neighbor List.
The following information is provided in SIB6:
arfcnValueUtranDl
cellReselectionPriority
threshXHigh
threshXLow
tReselectionUtra
tReselectionUtraSfMedium
tReselectionUtraSfHigh

LTE

f1/f2/f3

f1/f2/f3

SIB6

– Conn. Mode
Poor coverage evaluation process using primary threshold:

Mode
Poor coverage evaluation process using primary threshold:

Mode
Poor coverage UE handling

to allow WCDMA to LTE cell reselection (idle mode) the

following feature should be activated in the RNC:
LTE Cell Reselection (FAJ 121 1474) - ‘eutran detection’, EutranFreqRelation MO parameters.
By activating the feature creation and transmission of SIB19 in the WCDMA nodeB is enabled.
SIB19 contains information and parameters required by the UE to perform idle mode reselection to the LTE network.
No need to define specific LTE cells Neighbor List and no need to reconsider WCDMA already existing neighbors.
Cell reselection to LTE is supported by E-UTRA capable UEs in Idle Mode and in URA_PCH.
The following information is provided in SIB19:
LTE DL EARFCN (Max 8)
cellReselectionPriority
More…

LTE

f1/f2/f3

f1/f2/f3

order to allow WCDMA to LTE release with redirection in

connected mode, the following feature should be activated in the RNC:
Release with Redirect to LTE (FAJ 121 2174) – ’releaseRedirect’ Parameter.
Release with Redirect to LTE (FAJ 121 2174) is a complement to LTE Cell Reselection.
It ensures mobility to LTE for an active UE that spends little time in Idle Mode or in state URA_PCH where LTE Cell Reselection can be performed.
It is a blind redirection, fast and without compressed mode. There is no pre-allocation of resources in the target LTE system.
Release with Redirect to LTE is not supported when the best cell is located in DRNC.

LTE

f1/f2/f3

f1/f2/f3

If UE State:
Idle
Ura (FD)
Then - > ‘RRC Connection Release with redirection information (e-Utra Freq)