Activation and de-Activation of TTI Bundling Mode for Cell-edge

TEST CASE DESCRIPTION

RRM.5120 All rights reserved

Activation and de-activation of TTI bundling mode for cell-edge UEs Purpose:

The purpose of test case is to demonstrate switch to TTI bundling for Ues on cell-edge in power limit in lab environment. 1. Trigger events will be simulated in lab environment and switch from normal mode to TTI bundling will be verified. 2. Ue leaves cell edge and is in good radio condition. Switching from TTI bundling to normal mode will be verified.

Abstract:

UE is in good radio conditions and due to high MCS the measurements to start TTI bundling are not started yet by eNB although the measurements are activated for the UE. The UE moves to worse radio conditions and UE is transmitting with currentMCS number of Ues in TTI bundling is increased from 0 to 1: getNumOfUeInTtiBundlingMode(): m_ueInTtiBundlingMode: 0 , cellId: 774145 [ThreadID:157] incNumOfUeInTtiBundlingMode(): new m_ueInTtiBundlingMode: 1 , ueContextId: 18 , cellId: 774145

UE Tx power can be monitored by Ue tracer. Expected Result / Output Ue under test switches to TTI bundling. Intra-cell handover performed. Channel Type = DL_DCCH, Message Length = 36 Interpreted PDU: value DL-DCCH-Message ::= { message c1 : rrcConnectionReconfiguration : { rrc-TransactionIdentifier 1, criticalExtensions c1 : rrcConnectionReconfiguration-r8 : { mobilityControlInfo { targetPhysCellId 424, t304 ms1000, newUE-Identity '01100011 01101101'B, radioResourceConfigCommon { rach-Config { preambleInfo { numberOfRA-Preambles n40, preamblesGroupAConfig { sizeOfRA-PreamblesGroupA n32, messageSizeGroupA b144, messagePowerOffsetGroupB dB10 } }, powerRampingParameters { powerRampingStep dB2, preambleInitialReceivedTargetPower dBm-96 }, ra-SupervisionInfo { preambleTransMax n10, ra-ResponseWindowSize sf10, mac-ContentionResolutionTimer sf64 }, maxHARQ-Msg3Tx 5 }, prach-Config { rootSequenceIndex 30, prach-ConfigInfo { prach-ConfigIndex 3, highSpeedFlag FALSE, zeroCorrelationZoneConfig 12, prach-FreqOffset 5

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TEST CASE DESCRIPTION

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} }, pusch-ConfigCommon { pusch-ConfigBasic { n-SB 1, hoppingMode interSubFrame, pusch-HoppingOffset 6, enable64QAM FALSE }, ul-ReferenceSignalsPUSCH { groupHoppingEnabled FALSE, groupAssignmentPUSCH 0, sequenceHoppingEnabled FALSE, cyclicShift 0 } }, p-Max 33, ul-CyclicPrefixLength len1 }, rach-ConfigDedicated { ra-PreambleIndex 52, ra-PRACH-MaskIndex 0 } }, radioResourceConfigDedicated { mac-MainConfig explicitValue : { ul-SCH-Config { maxHARQ-Tx n8, periodicBSR-Timer sf10, retxBSR-Timer sf320,

ttiBundling TRUE }, timeAlignmentTimerDedicated sf10240 }, physicalConfigDedicated { pucch-ConfigDedicated { ackNackRepetition release : NULL }, cqi-ReportConfig { cqi-ReportModeAperiodic rm30, nomPDSCH-RS-EPRE-Offset 0, cqi-ReportPeriodic setup : { cqi-PUCCH-ResourceIndex 12, cqi-pmi-ConfigIndex 62, cqi-FormatIndicatorPeriodic widebandCQI : NULL, ri-ConfigIndex 1, simultaneousAckNackAndCQI TRUE } }, schedulingRequestConfig setup : { sr-PUCCH-ResourceIndex 18, sr-ConfigIndex 18, dsr-TransMax n64 } } }, securityConfigHO { handoverType intraLTE : { securityAlgorithmConfig

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TEST CASE DESCRIPTION

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{ cipheringAlgorithm eea2, integrityProtAlgorithm eia2 }, keyChangeIndicator FALSE, nextHopChainingCount 0 } } } } }

Action / Input Ue is in good radio condition.Ue’s SINR at least as good as before switching to TTIB.

Expected Result / Output Switch from TTIB mode to normal mode is triggered. Intra-cell handover performed. Channel Type = DL_DCCH, Message Length = 39 Interpreted PDU: value DL-DCCH-Message ::= { message c1 : rrcConnectionReconfiguration : { rrc-TransactionIdentifier 1, criticalExtensions c1 : rrcConnectionReconfiguration-r8 : { mobilityControlInfo { targetPhysCellId 424, t304 ms1000, newUE-Identity '00101010 10011010'B, radioResourceConfigCommon { rach-Config { preambleInfo { numberOfRA-Preambles n40, preamblesGroupAConfig { sizeOfRA-PreamblesGroupA n32, messageSizeGroupA b144, messagePowerOffsetGroupB dB10 } }, powerRampingParameters { powerRampingStep dB2, preambleInitialReceivedTargetPower dBm-96 }, ra-SupervisionInfo { preambleTransMax n10, ra-ResponseWindowSize sf10, mac-ContentionResolutionTimer sf64 }, maxHARQ-Msg3Tx 5 }, prach-Config { rootSequenceIndex 30, prach-ConfigInfo { prach-ConfigIndex 3, highSpeedFlag FALSE, zeroCorrelationZoneConfig 12,

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TEST CASE DESCRIPTION

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prach-FreqOffset 5 } }, pusch-ConfigCommon { pusch-ConfigBasic { n-SB 1, hoppingMode interSubFrame, pusch-HoppingOffset 6, enable64QAM FALSE }, ul-ReferenceSignalsPUSCH { groupHoppingEnabled FALSE, groupAssignmentPUSCH 0, sequenceHoppingEnabled FALSE, cyclicShift 0 } }, p-Max 33, ul-CyclicPrefixLength len1 }, rach-ConfigDedicated { ra-PreambleIndex 63, ra-PRACH-MaskIndex 0 } }, radioResourceConfigDedicated { mac-MainConfig explicitValue : { ul-SCH-Config { maxHARQ-Tx n5, periodicBSR-Timer sf10, retxBSR-Timer sf320,

ttiBundling FALSE }, drx-Config setup : { onDurationTimer psf6, drx-InactivityTimer psf4, drx-RetransmissionTimer psf4, longDRX-CycleStartOffset sf40 : 36 }, timeAlignmentTimerDedicated sf10240 }, physicalConfigDedicated { pucch-ConfigDedicated { ackNackRepetition release : NULL }, cqi-ReportConfig { cqi-ReportModeAperiodic rm30, nomPDSCH-RS-EPRE-Offset 0, cqi-ReportPeriodic setup : { cqi-PUCCH-ResourceIndex 12, cqi-pmi-ConfigIndex 74, cqi-FormatIndicatorPeriodic widebandCQI : NULL, ri-ConfigIndex 1, simultaneousAckNackAndCQI TRUE } }, schedulingRequestConfig setup : { sr-PUCCH-ResourceIndex 18, sr-ConfigIndex 30, dsr-TransMax n64

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TEST CASE DESCRIPTION

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} } }, securityConfigHO { handoverType intraLTE : { securityAlgorithmConfig { cipheringAlgorithm eea2, integrityProtAlgorithm eia2 }, keyChangeIndicator FALSE, nextHopChainingCount 0 } } } } }

4. Impacted KPI/Counters

Measurement type Counter group

LTE Cell Resource TTI bundling

TTI_BUNDLING_MODE_UE_AVG TTI_BUNDLING_GRANTS TTI_BUNDL_RETENTION_SHORT TTI_BUNDL_RETENTION_MEDIUM TTI_BUNDL_RETENTION_LONG

92 2316 1 1 0

M8011C62/ Average number of UEs configured for TTI Bundling mode The measurement provides the average number of UEs in TTI Bundling mode per sample. Each instance of a UE entering TTI Bundling Mode during the measurement interval is included in the average. Thus if, for example, a single UE is placed in TTI Bundling mode three times during the measurement interval, all of the three instances will be included in the average. The reported value is 100 times higher than the actual value (for example 1.00 is stored as 100).

M8011C63/ Number of UL grants for TTI Bundling Total number of grants for TTI Bundling.

M8011C64/ Short UE retention time in TTI Bundling mode

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TEST CASE DESCRIPTION

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The measurement represents the number of UEs that are in TTI Bundling mode for only a short period of time, which is defined as less than t1 seconds, that is retention time in TTI Bundling mode < t1 sec. M8011C65/ Medium UE retention time in TTI Bundling mode The measurement represents the number of UEs that are in TTI Bundling mode for a medium period of time. This time period is defined by a lower bound of t1 seconds and an upper bound of t2 seconds, that is retention time in TTI Bundling mode: t1