Service Specific Load Management

Service specific load management

Service specific load management

contentIntroductionBenefitsFeature DescriptionNetwork RequirementsNew ParametersNew Counters and EventsNetwork ImpactSSLM Test ScopeSummary


IntroductionIn a Load Management ContextThe feature introduces enhanced control of the UE selection process for inter-frequency load balancing and IRAT offload to WCDMA.

UE selection for Load Balancing action is based on UE services (QCI)Load measurementDetermine traffic load in each individual cellUE selection for load balancing actionDetermine and offload suitable UEsLoad information exchangeRequest and exchange load information between cellsLoad balancing action magnitudeDetermine the amount of offloading needed to balance loadcontentIntroductionBenefitsFeature DescriptionNetwork RequirementsNew ParametersNew Counters and EventsNetwork ImpactSSLM Test ScopeSummary

Benefitsbenefits of sSLMThe feature allows the operator to control how users are selected for load management action based on used service(s)

Possibility to require better (target) coverage for users with a certain service (e.g. VoIP) to qualify for load-triggeredSimilar support is available for coverage-triggered mobility as of L12A

Possibility to inhibit users with a certain service (e.g. VoIP) from load-triggered handovers to a higher E-UTRAN frequency

Possibility to inhibit users with a certain service (e.g. VoIP) from load-triggered handovers to a UTRAN frequency

Possibility to require that a user has a certain service (e.g. VoIP) in order to qualify for load-triggered handovers to a UTRAN frequency


Feature DescriptionSSLM new functionality in L14APossibility to apply an offset to the A4/B1 (IFLB/IRAT Offload threshold) depending on QCI (new in L14A)Configurable offset per (frequency relation, QCI)If a user has several bearers, the bearer which QCI has largest offset will apply

Possibility to exclude UEs from load balancing depending on QCIConfigurable per (frequency relation, QCI)A QCI can be configured as forbidden from load-triggered handoverA QCI can be configured as required for load-triggered handover (new in L14A)If more than one QCI is configured as required then a user with at least one required QCI is qualified for load-triggered handoverIn case of conflict, forbidden overrides required

By default a QCI is allowed for load-triggered handoverSuch a QCI will not inhibit a load-triggered handover for a user with the QCI (it is neither forbidden nor required)

Feature DescriptionSSLM voip exampleNote that only load relations from one cell are illustrated

FrequencyDistanceUTRAN cellE-UTRAN cellsVoIP users are completely inhibited from IRAT offload to the UTRAN frequencyThe A4 threshold (required to qualify for load balancing action) for VoIP users is 3 dB higher to the higher E-UTRAN frequencyNo specific constraints for VoIP users to the lower E-UTRAN frequencyFeature Descriptionmom structureImpact on Parameters


Network requirementsSSLM part of LM features As a prerequisite at least one of the following features shall be enabled and Operable.

FAJ 121 3009 (Inter-frequency Load Balancing) L12B FAJ 121 3048 (IRAT Offload to WCDMA) L13BFAJ 121 3061 (Inter-frequency Offload) L14AcontentIntroductionBenefitsFeature DescriptionNetwork RequirementsNew ParametersNew Counters and EventsNetwork ImpactSSLM Test ScopeSummary

NEW PARAMETERSINTRODUCED PARAMETERSMOLevelParameter nameDescriptionRangeE//DefaultEUtranFreqRelationlbA4ThresholdRsrpOffsetQCI specific offset for the absolute threshold a4ThresholdRsrp used for load management

Unit: 1 dB0..240EUtranFreqRelationlbQciProfileHandlingSpecifies QCI profile handling with regard to load managementALLOWED,FORBIDDEN,REQUIRED ALLOWEDEUtranFreqRelationqciProfileRefRefers to the QCI profile MO, QciProfilePredefined or QciProfileOperatorDefined. N/ANAUtranFreqRelationlbUtranB1ThresholdRscpOffsetQCI specific offset to the threshold b1ThresholdRscp used for load management

Unit: 1 dB0..240UtranFreqRelationlbQciProfileHandlingSpecifies QCI profile handling with regard to load managementALLOWED,FORBIDDEN,REQUIRED ALLOWEDUtranFreqRelationqciProfileRefRefers to the QCI profile MO, QciProfilePredefined or QciProfileOperatorDefined. N/ANAEUTRANUTRANcontentIntroductionBenefitsFeature DescriptionNetwork RequirementsNew ParametersNew Counters and EventsNetwork ImpactSSLM Test ScopeSummary

New counters & eventsSSLM observabilityNo new counters are introduced in this feature.

No new pmEvents are introduced. The following existing events are reused.EventEvent ParameterDescriptionINTERNAL_EVENT_LB_MEAS_UEEVENT_PARAM_FREQTarget frequencyEVENT_PARAM_NR_OF_UESNumber of UE that are selected to perform event A4 measurement on one target frequencyINTERNAL_EVENT_LB_QUAL_UEEVENT_PARAM_NEIGHBOR_CGICGI of neighbor target cells for which UE fulfilled event A4 criteriaEVENT_PARAM_NR_OF_UESNumber of UE that fulfilled event A4 criteriaMOCounter nameDescriptionExisting/New/LevelModifiedEUtranFreqRelation pmLbMeasuredUe Records the number of UEs selected for measurements qualifying for load balancing action towards cells on the related frequencyExistingUtranFreqRelationpmLbMeasuredUe Records the number of UEs selected for measurements qualifying for load balancing action towards cells on the related frequencyExistingEUtranFreqRelation pmLbQualifiedUe Records the number of UEs qualified for load balancing action towards the related cell. ExistingUtranFreqRelationpmLbQualifiedUe Records the number of UEs qualified for load balancing action towards the related cell. ExistingcontentIntroductionBenefitsFeature DescriptionNetwork RequirementsNew ParametersNew Counters and EventsNetwork ImpactSSLM Test ScopeSummary

Network impactNo impact is expected from this featurecontentIntroductionBenefitsFeature DescriptionNetwork RequirementsNew ParametersNew Counters and EventsNetwork ImpactSSLM Test ScopeSummary

SSLM test scopetest casesAssumptions:

All test cases are executed with the following configuration:

All test cases are executed with 700MHz and 2100MHz band, not other band unless specifically specified in individual test cases. All test cases are executed with 10MHz bandwidth by default unless explicitly stated by individual test cases

SSLM Test scope was divided in the following groupsFeature ActivationMobility

sslm test casesTest TypeTC NumberTest Descriptions Lab/FieldFeature ActivationSSLM_01Demonstrate the license handling and feature activation for Service specific load Management: ServiceSpecificLoadMgmt.LabMOBILITYSSLM_02Verify IFLB for UE with REQUIRED QCI1LabMOBILITYSSLM_03Verify IFLB for UE with QCI1 REQUIRED with additional lbA4ThresholdRsrpOffsetLabMOBILITYSSLM_04Verify IFLB for UEs with QCI1 FORBIDDEN, QC5 ALLOWED, QCI8 REQUIREDLabMOBILITYSSLM_05Verify IROW for UE with REQUIRED QCI8 and QCI FORBIDDENLabMOBILITYSSLM_06Verify IROW for UE with REQUIRED QCI8 with additional lbUtranB1ThresholdRscpOffsetLabsslm_IFLB_03Verify IFLB for UE with REQUIRED QCI1 with additional lbA4ThresholdRsrpOffsetObjective: To verify that UE with QCI1 is qualified for load balanced when the target measured cell has a better coverage i.e a4ThresholdRsrp + lbA4ThresholdRsrpOffset on QCI1Parameter Settings:

Pass/Fail Criteria: UE remains on source cell until VoLTE call is placed and target cell RSRP exceeds the total threshold (rsrp+offset) then UE moves to target cell.

MO Parameters GS value Test ValueServing Cell eutranFreqToQciProfileRelation,QciProfilePredefined=qci1lbQciProfileHandlingRequiredeutranFreqToQciProfileRelation,QciProfilePredefined=qci1lbA4ThresholdRsrpOffset3eutranFreqToQciProfileRelation,QciProfilePredefined=qci5lbQciProfileHandlingAllowedeutranFreqToQciProfileRelation,QciProfilePredefined=qci8lbQciProfileHandlingAllowedQciProfilePredefined qciSubscriptionQuanta QCI 1:50500QCI 5:2QCI 8:100LoadBalancingFunction lbCeiling 200200LoadBalancingFunction lbThreshold 3030ReportConfigEUtraInterFreqLb hysteresisA4 1010ReportConfigEUtraInterFreqLb a4ThresholdRsrp -106-90EutranCellRelation loadBalancing 0 (Not Allowed)1 (Allowed) Neighbor Cell EUtranCellFDD cellSubscriptionCapacity 20000 20000 QciProfilePredefined qciSubscriptionQuanta QCI 1:50500QCI 5:2QCI 8:100EutranCellRelation loadBalancing 0 (Not Allowed)0 (Not Allowed) sslm_IFLB_04Verify IFLB for UEs with QCI1 forbidden, QCI5 Allowed & QCI8 RequiredObjective: Verify IFLB for UEs with QCI1 FORBIDDEN, QC5 ALLOWED, QCI8 REQUIRED

Parameter Settings:

Pass/Fail Criteria: UE remains on source cell until VoLTE call is terminated then UE moves to target cell.

MO Parameters GS value Test ValueServing Cell EUtranCellFDD cellSubscriptionCapacity 10000 10000 eutranFreqToQciProfileRelation,QciProfilePredefined=qci1lbQciProfileHandlingForbiddeneutranFreqToQciProfileRelation,QciProfilePredefined=qci5lbQciProfileHandlingAllowedeutranFreqToQciProfileRelation,QciProfilePredefined=qci8lbQciProfileHandlingRequiredQciProfilePredefined qciSubscriptionQuanta QCI 1:50500QCI 5:2QCI 8:100LoadBalancingFunction lbCeiling 200200LoadBalancingFunction lbThreshold 3030ReportConfigEUtraInterFreqLb hysteresisA4 1010ReportConfigEUtraInterFreqLb a4ThresholdRsrp -106-90EutranCellRelation loadBalancing 0 (Not Allowed)1 (Allowed) Neighbor Cell EUtranCellFDD cellSubscriptionCapacity 20000 20000 QciProfilePredefined qciSubscriptionQuanta QCI 1:50500QCI 5:2QCI 8:100EutranCellRelation loadBalancing 0 (Not Allowed)0 (Not Allowed) SSLM_IROW_06Verify IROW for UE with REQUIRED QCI8 with additional lbUtranB1ThresholdRscpOffsetObjective: To verify that UEs with QCI8 is qualified for offload when the target cell has a better coverage i.e B1Rscp + B1RscpOffset on QCI8Parameter Settings:

Pass/Fail Criteria: When target cell reaches B1 threshold + B1 offset UE will be moved to the target cell.

MO Parameters GS Value Test ValueServing Cell EUtranCellFDDlbUtranOffloadThreshold 1ExternalUtranCellFDDlbUtranCellOffloadCapacity 20000 LoadBalancingFunctionlbUtranOffloadBackoffTime 60EUtranCellFDD cellSubscriptionCapacity 10000 3000eutranFreqToQciProfileRelation,QciProfilePredefined=qci8lbQciProfileHandlingRequiredeutranFreqToQciProfileRelation,QciProfilePredefined=qci8lbUtranB1ThresholdRscpOffset5QciProfilePredefined qciSubscriptionQuanta QCI 1:50500QCI 5:2QCI 8:100LoadBalancingFunction lbCeiling 200200LoadBalancingFunction lbThreshold 3030UtranCellRelationisHoAllowed false true ReportConfigInterLbUtranB1ThresholdRscp -100UtranCellRelationloadBalancing 2 (OFFLOAD) contentIntroductionBenefitsFeature DescriptionNetwork RequirementsNew ParametersNew Counters and EventsNetwork ImpactSSLM Test ScopeSummary

summaryThe feature is an add-on to features Inter-frequency Load Balancing, Inter-RAT Offload to WCDMA and Inter-frequency Offload

OSS - CEX Self Organized Networks provides support for filtering out cells on a certain source frequency relation towards target frequency and apply the settings to all objects found.

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Service Specific Load Management