The conditions for beginning and end of inter-RAT measurements are listed in Table 17:
Conditions for the inter-RAT measurements period. During that period, a decision about whether to initiate an inter-RAT handover or not is made; consequently, after a
successful target cell selection, a handover preparation phase is initiated.
Table 17 Conditions for the inter-RAT measurements period
Beginning of inter-RAT measurements* End of inter-RAT measurements**
The quality of serving cell becomes worse than threshold1 - hysteresis.
The quality of serving cell becomes better than threshold1 + hysteresis.
AND OR
The quality of inter-RAT neighbor cell becomes better than threshold2 + hysteresis.
The quality or power of inter-RAT neighbor cell becomes worse than threshold2 -hysteresis.
g
Note: * Both conditions must be met before the inter-RAT measurements begin.** Either of the conditions must be met before the inter-RAT measurements are ended.
3.4.3 LTE2572: system impact
Interdependencies between features
The following feature must be activated before activating the LTE2572: RSRQ-based B2 feature:
• LTE1198: RSRQ-triggered Mobility
The RSRQ-based A2 event takes a major role in the RSRQ-based B2 event;
therefore, the LTE1198: RSRQ-triggered Mobility feature needs to be enabled.
Impact on interfaces
The LTE2572: RSRQ-based B2 feature has no impact on interfaces.
Impact on network management tools
The LTE2572: RSRQ-based B2 feature has no impact on network management tools.
Impact on system performance and capacity
The LTE2572: RSRQ-based B2 feature has no impact on system performance or capacity.
3.4.4 LTE2572 reference data
Requirements
Table 18 LTE2572 hardware and software requirements Multiradio 10
BTS
Nokia AirScale BTS
Flexi Zone Micro BTS
Flexi Zone Access Point
FDD-LTE 17 Not supported FL17 FL17 FL17 FL17
Flexi Zone Controller
OMS UE NetAct MME SAE GW
FL17 LTE OMS 16A 3GPP R8 NetAct 17.2 Support not required
Support not required
Alarms
There are no alarms related to the LTE2572: RSRQ-based B2 feature.
BTS faults and reported alarms
There are no faults related to the LTE2572: RSRQ-based B2 feature.
Commands
There are no commands related to the LTE2572: RSRQ-based B2 feature.
Measurements and counters
There are no measurements or counters related to the LTE2572: RSRQ-based B2 feature.
Key performance indicators
There are no key performance indicators related to the LTE2572: RSRQ-based B2 feature.
Parameters
Table 19 New parameters introduced by LTE2572
Full name Abbreviated name Managed object
Parent structure
Activate RSRQ-based B2 actRsrqInterRatMo bility
LNBTS
-RSRQ B2 GERAN threshold1
b2Threshold1RsrqG ERAN
LNHOG rsrqB2GERANMobili tyParams
RSRQ B2 GERAN time to trigger
b2TimeToTriggerRs rqGERANMeas
LNHOG rsrqB2GERANMobili tyParams
RSRQ B2 GERAN hysteresis
hysB2ThresholdRsr qGERAN
LNHOG rsrqB2GERANMobili tyParams
RSRQ B2 GERAN report interval
reportIntervalRsr qGERAN
LNHOG rsrqB2GERANMobili tyParams
RSRQ B2 HRPD threshold1 b2Threshold1RsrqH rpd
LNHOH rsrqB2HrpdMobilit yParams
RSRQ B2 HRPD time to trigger
b2TimeToTriggerRs rqHrpdMeas
LNHOH rsrqB2HrpdMobilit yParams
Table 19 New parameters introduced by LTE2572 (Cont.) Full name Abbreviated name Managed
object
Parent structure
RSRQ B2 HRPD hysteresis hysB2ThresholdRsr qHrpd
LNHOH rsrqB2HrpdMobilit yParams
RSRQ B2 HRPD report interval
reportIntervalRsr qHrpd
LNHOH rsrqB2HrpdMobilit yParams
RSRQ B2 UTRA threshold1 b2Threshold1RsrqU tra
LNHOW rsrqB2UtraMobilit yParams
RSRQ B2 UTRA time to trigger
b2TimeToTriggerRs rqUtraMeas
LNHOW rsrqB2UtraMobilit yParams
RSRQ B2 UTRA hysteresis hysB2ThresholdRsr qUtra
LNHOW rsrqB2UtraMobilit yParams
RSRQ B2 UTRA report interval
reportIntervalRsr qUtra
LNHOW rsrqB2UtraMobilit yParams
RSRQ B2 1XRTT threshold1
b2Threshold1RsrqR tt
LNHOX rsrqB2RttMobility Params
RSRQ B2 1XRTT time to trigger
b2TimeToTriggerRs rqRttMeas
LNHOX rsrqB2RttMobility Params
RSRQ B2 1XRTT hysteresis
hysB2ThresholdRsr qRtt
LNHOX rsrqB2RttMobility Params
RSRQ B2 1XRTT report interval
reportIntervalRsr qRtt
LNHOX rsrqB2RttMobility Params
For parameter descriptions, see LTE Radio Access Operating Documentation/Reference/Parameters.
Sales information
Table 20 LTE2572 sales information
Product structure class License control Activated by default Application software (ASW) SW Asset Monitoring No
3.4.5 Activating LTE2572
Instructions to activate the LTE2572: RSRQ-based B2 feature using the BTS Site Manager
Before you start
• The activation procedure requires the following:
– The eNB must be operational, and the RNW database must be running.
– The LTE2572: RSRQ-based B2 feature must be deactivated; its LNBTS activation parameter actRsrqInterRatMobility must be set to false.
– The LTE1198 feature must be configured.
– Any relevant inter-RAT mobility functionalities are activated.
– Vendor-specific parameters are configured in the vendor file.
– Mandatory and optional operator-specific parameters are configured.
Procedure
1 Start the BTS Site Manager application and establish the connection to the BTS.
2 Start commissioning.
Sub-steps
a) Select View ► Commissioning or click Commissioning on the View Bar on the left.
The BTS Site checkbox, located in the Target section, is selected by default.
This is the recommended setting.
b) Use the Template, Manual, or Reconfiguration option, depending on the actual state of the BTS.
3 Proceed to the Radio Network Configuration page.
4 Go to the LNBTS object.
Object path: MRBTS ► LNBTS
5 Set the actRsrqInterRatMobility value to true.
g
Note: As an alternative, activation can also be done by reconfiguring the mandatory and optional operator-specific parameters.6 Send the commissioning plan file to the BTS.
Sub-steps
a) Go to the Send Parameters page.
b) Select an appropriate Send option.
• If the BTS has not been commissioned, select All parameters.
• If the BTS has been already commissioned, select Only changes.
c) Click Send Parameters.
Result
Expected outcome
The Flexi Multiradio BTS supports inter-RAT mobility based on the B2 RSRQ measurement reporting.