Dl Max Throughput

BTS3900, BTS3900 LTE

MOD TCPACKCTRLALGO

LST TCPACKCTRLALGO

Indicates the maximum downlink throughput in the TCP ACK control algorithm. If this parameter is set to 0, the downlink throughput in the TCP ACK control algorithm is not under control.

NO

NO

NO

LOFD-001026 / TDLOFD-001028

TCP Proxy Enhancer(TPE)

Interval Type

0~4294967295

N/A

bit/s

0~4294967295

0

0

Engineering Design

TcpAckCtrlAlgo

None

Read & Write

No (And no impact on the UE in idle mode)

N/A

N/A

None

The parameter modification has no impact on the equipment.

If the parameter value is smaller than the data rate over the air interface, the downlink throughput will decrease. If the parameter value is much greater than the data rate over the air interface, the TCP ACK control algorithm cannot take effect.

BTS3900: V100R008C00

BTS3900 LTE: V100R005C00

Radio

L

DL Throughput Threshold

BTS3900, BTS3900 LTE

MOD TCPACKLIMITALG

LST TCPACKLIMITALG

Indicates the maximum downlink service throughput that can be set by the TCP ACK limit algorithm. When this switch is set to on, the ACK burst of downlink TCP services is avoided and the KPIs related to the downlink throughput are improved.

NO

NO

NO

None

None

Interval Type

1~4194304

N/A

kbit/s

1~4194304

153600

153600

Engineering Design

TCPACKLIMITALG

None

Read & Write

N/A

N/A

N/A

None

The parameter modification has no impact on the equipment.

When the value of this parameter is less than the actual data rate on the air interface, the downlink throughput of TCP services decreases.

When the value of this parameter is much greater than the actual data rate on the air interface, the TCP ACK buffer transmit function becomes invalid.

BTS3900: V100R009C00

BTS3900 LTE: V100R009C00

Transport

L

Uplink PRB threshold

BTS3900, BTS3900 LTE

MOD CELLSHUTDOWN

LST CELLSHUTDOWN

Indicates the uplink PRB threshold for starting intelligent power-off of carriers in the same coverage for the cell.

NO

NO

NO

LOFD-001042 / TDLOFD-001042

Intelligent Power-Off of Carriers in the Same Coverage

Interval Type

0~100

N/A

%

0~100

20

20

Default/Recommended Value

CellShutdown

In the CellShutdown MO, the sum of UlPrbThd and UlPrbOffset must be smaller than or equal to 100.

Read & Write

No (And no impact on the UE in idle mode)

N/A

N/A

None

The parameter modification has no impact on the equipment.

None

BTS3900: V100R008C00

BTS3900 LTE: V100R002C00

Radio

L

Downlink PRB threshold

BTS3900, BTS3900 LTE

MOD CELLSHUTDOWN

LST CELLSHUTDOWN

Indicates the downlink PRB threshold for starting intelligent power-off of carriers in the same coverage for the cell.

NO

NO

NO

LOFD-001042 / TDLOFD-001042

Intelligent Power-Off of Carriers in the Same Coverage

Interval Type

0~100

N/A

%

0~100

20

20

Default/Recommended Value

CellShutdown

In the CellShutdown MO, the sum of DlPrbThd and DlPrbOffset must be smaller than or equal to 100.

Read & Write

No (And no impact on the UE in idle mode)

N/A

N/A

None

The parameter modification has no impact on the equipment.

None

BTS3900: V100R008C00

BTS3900 LTE: V100R002C00

Radio

L

DL schedule switch

BTS3900, BTS3900 LTE

MOD CELLALGOSWITCH

LST CELLALGOSWITCH

Indicates the switches related to downlink scheduling in the cell.

FreqSelSwitch: Indicates whether to enable frequency selective scheduling. If this switch is on, data is transmitted on the frequency band in good signal quality.

ServiceDiffSwitch: Indicates whether to enable service differentiation. If this switch is on, service differentiation is applied. If this switch is off, service differentiation is not applied.

SpsSchSwitch: Indicates whether to enable semi-persistent scheduling during talk spurts of VoIP services. If this switch is on, semi-persistent scheduling is applied during talk spurts of VoIP services. If this switch is off, dynamic scheduling is applied during talk spurts of VoIP services.

MBSFNShutDownSwitch: Indicates whether to enable Multimedia Broadcast multicast service Single Frequency Network (MBSFN) subframe shutdown. If this switch is on, MBSFN subframe shutdown is applied. If this switch is off, MBSFN subframe shutdown is not applied. This switch is valid only when SymbolShutdownSwitch is on. If the MBSFN shutdown switch is on, the setting of the switch for mapping SIBs to SI messages becomes invalid. The latter can be specified by the SiMapSwitch parameter in the CellSiMap MO. If the MBSFN subframe shutdown switch is off, the setting of the switch for mapping SIBs to SI messages becomes valid. MBSFN subframe shutdown applies only to LTE-only base stations.

NonGbrBundlingSwitch: Indicates whether to enable downlink non-GBR packet bundling. If this switch is on, delay of non-GBR services can be controlled in non-congestion scenarios. If this switch is off, delay of non-GBR services cannot be controlled.

EnAperiodicCqiRptSwitch: Indicates whether to enable enhanced aperiodic channel quality indicator (CQI) reporting. If this switch is on, the eNodeB triggers aperiodic CQI reporting for a UE based on downlink services of the UE and the interval at which the UE sends periodic CQI reports. If this switch is off, UEs under non-frequency selective scheduling do not trigger aperiodic CQI reporting based on downlink services and triggers an aperiodic CQI reporting if no valid periodic CQI reports are sent in eight consecutive periodic CQI reporting periods.

DlMbrCtrlSwitch: Indicates whether to enable downlink scheduling based on the maximum bit rate (MBR) and guaranteed bit rate (GBR) on the GBR bearer. If this switch is on, the eNodeB performs downlink scheduling on GBR bearers based on the MBR and GBR. If this switch is off, the eNodeB performs downlink scheduling on GBR bearers based on the GBR only.

MbrDlSchSwitch: Indicates whether the eNodeB performs downlink scheduling based on MBR. If this switch is on, the eNodeB determines priorities of UEs based on the MBR in downlink scheduling. This parameter applies only to LTE TDD cells.

UeAmbrDlSchSwitch: Indicates whether the eNodeB performs downlink scheduling based on the aggregate maximum bit rate (AMBR) of UEs. If this switch is on, the eNodeB determines priorities of UEs based on the AMBR of UEs in downlink scheduling. This parameter applies only to LTE TDD cells.

EpfEnhancedSwitch: Indicates whether to enable enhanced proportional fair (EPF) for downlink scheduling. EPF for downlink scheduling is enabled only when this switch is on.

AperiodicCqiTrigOptSwitch: Indicates whether to trigger aperiodic CQI optimization. If this switch is on, a UE performing initial access triggers aperiodic CQI reporting based on related triggering conditions after the DLMAC instance has been established for 200 ms and the eNodeB receives MSG5. Consider that aperiodic CQI reporting is triggered by invalid CQI reports in eight consecutive CQI reporting periods. If cyclic redundancy check (CRC) on aperiodic CQI reports fails, aperiodic CQI reporting is not repeatedly triggered when DRX is enabled; or aperiodic CQI reporting is triggered after eight TTIs when DRX is disabled. If this switch is off, a UE performing initial access triggers aperiodic CQI reporting based on related triggering conditions after the DLMAC instance has been established for 200 ms. Consider that aperiodic CQI reporting is triggered by invalid CQI reports in eight consecutive CQI reporting periods. If CRC on aperiodic CQI reports fails, aperiodic CQI reporting is triggered after eight TTIs regardless of the DRX status.

VoipTbsBasedMcsSelSwitch: Indicates whether the modulation and coding scheme (MCS) index is selected based on the transport block size (TBS) in downlink scheduling for VoIP services. If this switch is on, the MCS index is selected based on the TBS in downlink scheduling for VoIP services. If this switch is off, the MCS index is not selected based on the TBS in downlink scheduling for VoIP services.

UeSigMcsEnhanceSwitch: Indicates whether to enable or disable the optimized MCS algorithm for UE signaling. The optimized MCS algorithm for UE signaling takes effect after this switch is on. This parameter applies only to LTE TDD cells.

PagingInterfRandSwitch: Indicates whether to enable or disable interference randomizing for paging messages. If this switch is on, interference randomizing is enabled for paging messages. This switch is valid only in TDD mode.

DlSingleUsrMcsOptSwitch: Indicates conditions for lowering the modulation and coding scheme (MCS) for a single UE. When this switch is on, the MCS can be lowered for a UE if the UE is the only UE to be scheduled in a transmission time interval (TTI). When this switch is off, the MCS can be lowered for a UE if there are only 10 percent of TTIs having UEs to schedule in each sparse packet determination period and the UE is the only UE to be scheduled in each TTI.

SubframeSchDiffSwitch: Indicates whether subframes 3 and 8 perform scheduling based on increased number of uplink scheduling UEs when subframe configuration type 2 is used. If this switch is on, subframes 3 and 8 perform scheduling based on increased number of uplink scheduling UEs when subframe configuration type 2 is used. If this switch is off, subframes 3 and 8 perform scheduling based on the policy that other downlink subframes adopt when subframe configuration type 2 is used. This switch is dedicated to LTE TDD cells.

TailPackagePriSchSwitch: Indicates the switch that controls the scheduling of downlink connected tail packages in the bearer. If this switch is on, the connected tail package is scheduled preferentially in the next TTI, which reduces the delay and increases the transmission rate. If this switch is off, the scheduling strategy of the connected tail package is the same as other downlink subframes. This switch is dedicated to LTE TDD cells.

FreqSelJudgeIgnorDopplerSwitch: Indicates whether Doppler determination conditions are considered during channel frequency selective scheduling determination. Doppler determination conditions are considered only when this option is deselected. This option applies only to LTE FDD.

SIB1InterfRandSwitch: Indicates whether to enable SIB1 interference randomizing. If this switch is on, interference randomizing is enabled for SIB1. This switch applies only to LTE TDD cells.

Disuse Statement:ServiceDiffSwitch_IN_BITMAP: This parameter will be removed in later versions. In this version, the setting of this parameter is still synchronized between the U2000 and the eNodeB, but it is no longer used internally. Therefore, avoid using this parameter.

NO

NO

NO

LOFD-001016 / TDLOFD-001016

LOFD-00101502 / TDLOFD-00101502

LOFD-001109 / TDLOFD-001109

LOFD-001070 / TDLOFD-001070

TDLOFD-070224

LBFD-002025 / TDLBFD-002025

LBFD-002031 / TDLBFD-002031

LBFD-070102 / TDLBFD-070102

LBFD-060202

VoIP Semi-persistent Scheduling

Dynamic Scheduling

DL Non-GBR Packet Bundling

Symbol Power Saving

Scheduling Based on Max Bit Rate

Basic Scheduling

Support of aperiodic CQI reports

MBR>GBR Configuration

Enhanced DL Frequency Selective

Bit Field Type

FreqSelSwitch(FreqSelSwitch), ServiceDiffSwitch(ServiceDiffSwitch), SpsSchSwitch(SpsSchSwitch), MBSFNShutDownSwitch(MBSFNShutDownSwitch), NonGbrBundlingSwitch(NonGbrBundlingSwitch), EnAperiodicCqiRptSwitch(EnAperiodicCqiRptSwitch), DlMbrCtrlSwitch(DlMbrCtrlSwitch), MbrDlSchSwitch(MbrDlSchSwitch), UeAmbrDlSchSwitch(UeAmbrDlSchSwitch), EpfEnhancedSwitch(EpfEnhancedSwitch), AperiodicCqiTrigOptSwitch(AperiodicCqiTrigOptSwitch), VoipTbsBasedMcsSelSwitch(VoipTbsBasedMcsSelSwitch), PagingInterfRandSwitch(PagingInterfRandSwitch), DlSingleUsrMcsOptSwitch(DlSingleUsrMcsOptSwitch), SubframeSchDiffSwitch(SubframeSchDiffSwitch), TailPackagePriSchSwitch(TailPackagePriSchSwitch), UeSigMcsEnhanceSwitch(UeSigMcsEnhanceSwitch), FreqSelJudgeIgnorDopplerSwitch(FreqSelJudgeIgnorDopplerSwitch), SIB1InterfRandSwitch(SIB1InterfRandSwitch)

FreqSelSwitch~0, ServiceDiffSwitch~1, SpsSchSwitch~2, MBSFNShutDownSwitch~3, NonGbrBundlingSwitch~4, EnAperiodicCqiRptSwitch~5, DlMbrCtrlSwitch~6, MbrDlSchSwitch~7, UeAmbrDlSchSwitch~8, EpfEnhancedSwitch~9, AperiodicCqiTrigOptSwitch~10, VoipTbsBasedMcsSelSwitch~11, PagingInterfRandSwitch~12, DlSingleUsrMcsOptSwitch~13, SubframeSchDiffSwitch~14, TailPackagePriSchSwitch~15, UeSigMcsEnhanceSwitch~16, FreqSelJudgeIgnorDopplerSwitch~17, SIB1InterfRandSwitch~18

None

FreqSelSwitch, ServiceDiffSwitch, SpsSchSwitch, MBSFNShutDownSwitch, NonGbrBundlingSwitch, EnAperiodicCqiRptSwitch, DlMbrCtrlSwitch, MbrDlSchSwitch, UeAmbrDlSchSwitch, EpfEnhancedSwitch, AperiodicCqiTrigOptSwitch, VoipTbsBasedMcsSelSwitch, PagingInterfRandSwitch, DlSingleUsrMcsOptSwitch, SubframeSchDiffSwitch, TailPackagePriSchSwitch, UeSigMcsEnhanceSwitch, FreqSelJudgeIgnorDopplerSwitch, SIB1InterfRandSwitch

FreqSelSwitch:Off, ServiceDiffSwitch:Off, SpsSchSwitch:Off, MBSFNShutDownSwitch:Off, NonGbrBundlingSwitch:Off, EnAperiodicCqiRptSwitch:Off, DlMbrCtrlSwitch:Off, MbrDlSchSwitch:Off, UeAmbrDlSchSwitch:Off, EpfEnhancedSwitch:Off, AperiodicCqiTrigOptSwitch:Off, VoipTbsBasedMcsSelSwitch:Off, PagingInterfRandSwitch:Off, DlSingleUsrMcsOptSwitch:Off, SubframeSchDiffSwitch:Off, TailPackagePriSchSwitch:Off, UeSigMcsEnhanceSwitch:Off, FreqSelJudgeIgnorDopplerSwitch:Off, SIB1InterfRandSwitch:On

FreqSelSwitch:Off,

ServiceDiffSwitch:Off,

SpsSchSwitch:Off,

MBSFNShutDownSwitch:Off,

NonGbrBundlingSwitch:Off,

EnAperiodicCqiRptSwitch:Off,

DlMbrCtrlSwitch:Off,

MbrDlSchSwitch:Off,

UeAmbrDlSchSwitch:Off,

EpfEnhancedSwitch:Off,

AperiodicCqiTrigOptSwitch:Off,

VoipTbsBasedMcsSelSwitch:Off,

UeSigMcsEnhanceSwitch:Off,

DlSingleUsrMcsOptSwitch:Off,

SubframeSchDiffSwitch:Off,

TailPackagePriSchSwitch:Off,

FreqSelJudgeIgnorDopplerSwitch:Off,

SIB1InterfRandSwitch:On

Engineering Design

CellAlgoSwitch

OutOfBandRelaySwitch under the RelaySwitch parameter in the CellAlgoSwitch MO cannot be turned on when MBSFNShutDownSwitch under the DlSchSwitch parameter is turned on.

If SuperCombCellSwitch of SfnAlgoSwitch in the CellAlgoSwitch MO is set to on, SpsSchSwitch of DlSchSwitch in the CellAlgoSwitch MO must be deselected.

Read & Write

No (And no impact on the UE in idle mode)

N/A

N/A

None

The parameter modification has no impact on the equipment.

FreqSelSwitch: If this switch is on, the subband CQIs reported by UEs are used in downlink scheduling for UEs that meet the requirements for frequency selection, thereby increasing the spectrum efficiency for UEs. If this switch is off, wideband CQIs reported by UEs are used in downlink scheduling for all UEs.

ServiceDiffSwitch: If this switch is on, the eNodeB performs differentiated control on different services carried by non-GBR bearers. When the cell is congested, the data rate of different services on the Uu interface can be controlled based on customized priorities, ensuring that data transmission priorities of different services can be dynamically adjusted. If this switch is off, the eNodeB does not perform differentiated control on different services carried by non-GBR bearers.

SpsSchSwitch: If this switch is on, the eNodeB performs semi-persistent scheduling on VoIP services, and PDCCH resource overhead and CQI reporting overhead decrease, which increases the VoIP traffic volume. If this switch is off, the eNodeB performs dynamic scheduling on VoIP services, and PDCCH resource overhead increases. As a result, the VoIP traffic volume decreases, but the QoS of VoIP services improves.

MBSFNShutDownSwitch: If this switch is on, more energy can be conserved, but resource scheduling delay is prolonged. If this switch is off, opposite effects are generated.

EnAperiodicCqiRptSwitch: Turning on this switch leads to timely report of downlink channel quality and increased downlink data rate. Because more control channel elements (CCEs) are consumed by aperiodic CQI reporting, it is recommended that the PdcchSymNumSwitch parameter be set to ECfiAdaptionON to decrease the number of symbols consumed by enhanced aperiodic CQI reporting, thereby further increasing downlink data rates. Turning off this switch has no impact on network performance.

DlMbrCtrlSwitch: If the MBR is greater than the GBR and a GBR bearer is set up for a UE, the eNodeB allocates more RBs to downlink GBR services after this switch is turned on, thereby increasing the downlink traffic volume on the GBR bearer. If the MBR is equal to the GBR and only the non-GBR bearer is set up for a UE, turning on this switch has no impact on network performance. If the MBR is equal to the GBR and a GBR bearer is set up for a UE: (1) Setting this switch to on has no impact on network performance when RBs for downlink services are sufficient. (2) Non-GBR services are affected by GBR services after this switch is on when RBs for downlink services are insufficient. Setting this switch to off has no impact on network performance.

MbrDlSchSwitch/UeAmbrDlSchSwitch: If the switch is on, throughput of UEs with greater MBR/AMBR increases, and throughput of UEs with smaller MBR/AMBR decreases. In addition, system throughput may also be affected by the differences between MBRs/AMBRs of UEs and the distribution of UEs in the cell. If this switch is off, the throughput differences between UEs with different MBRs/AMBRs decrease. In addition, system throughput is not affected by the differences between MBRs/AMBRs of UEs or the distribution of UEs in the cell.

EpfEnhancedSwitch: Setting this switch to on increases downlink user throughput and improves user experience. Turning off this switch has no impact on network performance.

AperiodicCqiTrigOptSwitch: Setting this switch to on reduces PDCCH resources to be consumed and increases downlink throughput. Setting this switch to off has no impact on network performance.

VoipTbsBasedMcsSelSwitch: Setting this switch to on decreases the number of hybrid automatic repeat request (HARQ) retransmissions for VoIP services and the scheduling delay of UEs in and near the cell center.

DlSingleUsrMcsOptSwitch: If this switch is on and the load is low, the local cell throughput increases; however, the interference with neighboring cells increases, the neighboring cell throughput decreases, and the IBLER increases. If this switch is off, network performance is not affected.

UeSigMcsEnhanceSwitch: If this switch is on, the UE throughput increases, and the UE MCS distribution is optimized. However, the RRC reestablishment success rate slightly decreases, and the service drop rate increases. If this switch is off, the UE throughput decreases, the UE MCS distribution deteriorates. However, the RRC reestablishment success rate and service drop rate are not affected.

SubframeSchDiffSwitch: If this switch is on, the number of uplink UEs scheduled increases but the number of downlink UEs scheduled decreases; as a result, the uplink PRB usage increases but the downlink PRB usage may decrease slightly. If this switch is off, the number of uplink UEs scheduled decreases and as a result the uplink PRB usage decreases.

TailPackagePriSchSwitch: If this switch is on, the connected tail package is scheduled preferentially in the next TTI, which shortens the delay and increases the transmission rate. If this switch is off, the connected tail package is not scheduled preferentially in the next TTI, which prolongs the delay and decreases the transmission rate.

FreqSelJudgeIgnorDopplerSwitch: If this option is selected, Doppler determination conditions are not considered during channel frequency selective scheduling determination. You are advised to select this option when the number of UEs in low-speed mobility is large, so as to increase downlink frequency selective scheduling gains. If this option is deselected, Doppler determination conditions are considered during channel frequency selective scheduling determination. You are advised to deselect this option when the number of UEs in high-speed mobility is large, so as to avoid negative gains caused by frequency selective scheduling on UEs in high-speed mobility.

SIB1InterfRandSwitch: If this switch is on, the RBs scheduled for neighboring cells do not overlap. The interference caused by the RBs for SIB1s of the neighboring cells to the same target cell is evenly distributed on the entire band. In this way, the SIB1 demodulation capability in the target cell is improved, reducing the service drops caused by SIB1 demodulation failures. If this switch is off, the RBs scheduled for neighboring cells overlap.

BTS3900: V100R008C00

BTS3900 LTE: V100R003C00

Radio

L

CQI Adjust Algorithm Switch

BTS3900, BTS3900 LTE

MOD CELLALGOSWITCH

LST CELLALGOSWITCH

CqiAdjAlgoSwitch: Indicates whether to allow the eNodeB to adjust the UE-reported CQI based on the initial block error rate (IBLER).

If this switch is On, the CQI adjustment algorithm is enabled. In this case, the eNodeB adjusts the UE-reported CQI based on the IBLER.

If this switch is off, the CQI adjustment algorithm is disabled. In this case, the eNodeB does not adjust the UE-reported CQI based on the IBLER.

StepVarySwitch: Indicates whether to enable the variable-step-based adjustment algorithm.

If this switch is On, the variable-step-based adjustment algorithm is enabled to accelerate the convergence of IBLER. In this case, rapid adjustment at large steps is applied if there is a relatively large difference between the measured IBLER and target IBLER; fine-tuning at small steps is applied if the measured IBLER approaches the target IBLER.

If this switch is off, the adjustment is performed at a fixed step.

DlVarIBLERtargetSwitch: Indicates whether to enable downlink target IBLER adaption.

If this switch is On, the downlink target IBLER is adjusted based on the size of transport blocks (TBs) to improve the spectral efficiency.

If this switch is off, the target IBLER is determined based on the setting of DlEnVarIblerTargetSwitch.

TddBundlingCqiAdjOptSwitch: Indicates whether to use optimized CQI adjustment algorithm in ACK bundling mode.

If this switch is On, the optimized CQI adjustment algorithm is used.

If this switch is off, the optimized CQI adjustment algorithm cannot be used.

TddMultiplexingCqiAdjOptSwitch: Indicates whether to use the optimized CQI adjustment algorithm in ACK multiplexing mode.

If this switch is On, the optimized CQI adjustment algorithm is used.

If this switch is off, the optimized CQI adjustment algorithm cannot be used.

AdaptiveStepVarySwitch: Indicates whether to enable adaptive step change in CQI adjustment.

If this switch is On, significant changes in the signal quality can be detected, and the CQI adjustment is performed at a large step, accelerating the IBLER convergence.

If this switch is off, the CQI adjustment is performed at a fixed step.

DlCqiAdjDeltaOptSwitch: Indicates whether to enable optimization on downlink CQI adjustment. If this switch is off, the CQI adjustment is calculated based on the following formula: CQI adjustment = (Number of ACKs for initial transmissions x CQI adjustment per ACK + Number of NACKs for initial transmissions x CQI adjustment per NACK)/(Number of NACKs for initial transmissions + Number of ACKs for initial transmissions). If this switch is On, the CQI adjustment is calculated based on the following formula: CQI adjustment = Number of ACKs for initial transmissions x CQI adjustment per ACK + Number of NACKs for initial transmissions x CQI adjustment per NACK).

DlEnVarIblerTargetSwitch: Indicates whether to enable enhanced downlink target IBLER adaption. If this switch is On, the downlink target IBLER is adaptively adjusted based on CQI fluctuation and TB size. If this switch is off, the downlink target IBLER policy is controlled by DlVarIBLERtargetSwitch. This switch applies only to FDD cells.

DlRetxTbsIndexAdjOptSwitch: Indicates whether to enable transport block size (TBS) index adjustment optimization in retransmissions.

If this switch is On, TBS index adjustment optimization in retransmissions is enabled. The TBS index is lowered for the scheduling of the last two retransmissions, and the TBS index is determined based on the CQI adjustment for the scheduling of other retransmissions. If this switch is off, TBS index adjustment optimization in retransmissions is disabled. The TBS index is determined based on the CQI adjustment for the scheduling of all retransmissions.

CfiConvertOptSwitch: Indicates whether to enable CFI calculation optimization. If this switch is turned on, new CFI calculation tables for normal and special subframes are used to ensure more accurate MCS selection in normal and special subframes and facilitate IBLER convergence to the target value. If this switch is turned off, the original CFI calculation tables for normal and special subframes are used. This switch applies only to LTE TDD networks.

BundlingOptThdSwitch: Indicates whether to adjust the MCS index threshold for enabling the optimized CQI adjustment algorithm in TDD bundling mode. If this switch is turned on, the lower MCS index threshold for enabling the optimized CQI adjustment algorithm in TDD bundling mode is changed from MCS index 6 to MCS index 0. If this switch is turned off, the lower MCS index threshold for enabling the optimized CQI adjustment algorithm in TDD bundling mode is MCS index 6. This switch applies only to LTE TDD networks.

NO

NO

NO

LOFD-00101501 / TDLOFD-00101501

LOFD-00101502 / TDLOFD-00101502

CQI Adjustment

Dynamic Scheduling

Bit Field Type

CqiAdjAlgoSwitch(CqiAdjAlgoSwitch), StepVarySwitch(StepVarySwitch), DlVarIBLERtargetSwitch(DlVarIBLERtargetSwitch), TddBundlingCqiAdjOptSwitch(TddBundlingCqiAdjOptSwitch), TddMultiplexingCqiAdjOptSwitch(TddMultiplexingCqiAdjOptSwitch), AdaptiveStepVarySwitch(AdaptiveStepVarySwitch), DlCqiAdjDeltaOptSwitch(DlCqiAdjDeltaOptSwitch), DlEnVarIblerTargetSwitch(DlEnVarIblerTargetSwitch), DlRetxTbsIndexAdjOptSwitch(DlRetxTbsIndexAdjOptSwitch), CfiConvertOptSwitch(CfiConvertOptSwitch), BundlingOptThdSwitch(BundlingOptThdSwitch)

CqiAdjAlgoSwitch~0, StepVarySwitch~1, DlVarIBLERtargetSwitch~2, TddBundlingCqiAdjOptSwitch~3, TddMultiplexingCqiAdjOptSwitch~4, AdaptiveStepVarySwitch~5, DlCqiAdjDeltaOptSwitch~6, DlEnVarIblerTargetSwitch~7, DlRetxTbsIndexAdjOptSwitch~8, CfiConvertOptSwitch~9, BundlingOptThdSwitch~10

None

CqiAdjAlgoSwitch, StepVarySwitch, DlVarIBLERtargetSwitch, TddBundlingCqiAdjOptSwitch, TddMultiplexingCqiAdjOptSwitch, AdaptiveStepVarySwitch, DlCqiAdjDeltaOptSwitch, DlEnVarIblerTargetSwitch, DlRetxTbsIndexAdjOptSwitch, CfiConvertOptSwitch, BundlingOptThdSwitch

CqiAdjAlgoSwitch:On, StepVarySwitch:Off, DlVarIBLERtargetSwitch:Off, TddBundlingCqiAdjOptSwitch:Off, TddMultiplexingCqiAdjOptSwitch:Off, AdaptiveStepVarySwitch:Off, DlCqiAdjDeltaOptSwitch:Off, DlEnVarIblerTargetSwitch:Off, DlRetxTbsIndexAdjOptSwitch:Off, CfiConvertOptSwitch:Off, BundlingOptThdSwitch:Off

In LTE FDD: CqiAdjAlgoSwitch:On, StepVarySwitch:Off, DlVarIBLERtargetSwitch:On, TddBundlingCqiAdjOptSwitch:Off, TddMultiplexingCqiAdjOptSwitch:Off, AdaptiveStepVarySwitch:Off, DlCqiAdjDeltaOptSwitch:Off, DlEnVarIblerTargetSwitch:Off, DlRetxTbsIndexAdjOptSwitch:Off

In LTE TDD: CqiAdjAlgoSwitch:On, StepVarySwitch:Off, DlVarIBLERtargetSwitch:Off, TddBundlingCqiAdjOptSwitch:Off, TddMultiplexingCqiAdjOptSwitch:Off, AdaptiveStepVarySwitch:Off, DlEnVarIblerTargetSwitch:Off, DlRetxTbsIndexAdjOptSwitch:Off, CfiConvertOptSwitch:Off, BundlingOptThdSwitch:off

Engineering Design

CellAlgoSwitch

None

Read & Write

No (And no impact on the UE in idle mode)

N/A

N/A

None

The parameter modification has no impact on the equipment.

CqiAdjAlgoSwitch: If this switch is on, the UE reports CQIs more accurately, increasing the downlink rate. If this switch is off, the UE may report CQIs inaccurately, decreasing the downlink rate.

StepVarySwitch: If this switch is on, the IBLER convergence rate can be adjusted based on site scenarios, increasing the downlink rate in some scenarios. If this switch is off, the IBLER convergence rate cannot be adjusted, decreasing the downlink rate in some scenarios.

DlVarIBLERtargetSwitch: If this switch is on, the IBLER target value can be adjusted in some scenarios, increasing the downlink rate. If this switch is off, the IBLER target value cannot be adjusted, decreasing the downlink rate in some scenarios.

TddBundlingCqiAdjOptSwitch: If this switch is on, UEs using the ACK bundling mode enable the optimized CQI adjustment algorithm and choose a more proper MCS mode, increasing downlink throughput of each UE and cell average downlink throughput. If this switch is off, UEs using the ACK bundling mode enable the non-optimized CQI algorithm, which may result in a lower MCS value, smaller downlink throughput of each UE, and smaller cell average downlink throughput.

TddMultiplexingCqiAdjOptSwitch: If this switch is on, UEs using the ACK multiplexing mode enable the optimized CQI adjustment mechanism and choose a more proper MCS mode, increasing downlink throughput of each UE and cell average throughput. If this switch is off, UEs using the ACK multiplexing mode enable the non-optimized CQI mechanism, which may result in an incorrect MCS value for special subframes and decrease downlink throughput of each UE and cell average downlink throughput.

AdaptiveStepVarySwitch: If this switch is on, the CQI adjustment is performed at a large step in case of significant signal quality changes, accelerating the IBLER convergence and therefore increasing the downlink throughput. If this switch is off, the CQI adjustment is performed at a fixed step, which has no impact on network performance.

DlCqiAdjDeltaOptSwitch: If this switch is on, the IBLER convergence performance improves and downlink throughput increases. However, the RBLER and service drop rate may also increase.

Setting this switch to off has no impact on network performance.

DlEnVarIblerTargetSwitch: If this switch is on, downlink throughput increases when channel quality fluctuates greatly or slightly or the proportion of small-packet services is high. However, the RBLER may increase. Setting this switch to off has no impact on network performance.

DlRetxTbsIndexAdjOptSwitch: If this switch is on, both the downlink RBLER and the service drop rate decrease, but downlink throughput may also decrease slightly. Setting this switch to off has no impact on network performance.

CfiConvertOptSwitch: If this switch is turned on, the CFI calculation tables for normal and special subframes are optimized. In this case, the MCS index is increased to improve downlink throughput. However, the service drop rate may slightly increase.

BundlingOptThdSwitch: If this switch is turned on, the MCS index threshold for enabling the optimized CQI adjustment algorithm in TDD bundling mode decreases. In this case, when the downlink target IBLER adaption algorithm is disabled, the optimized CQI adjustment algorithm in TDD bundling mode helps increase the throughput of CEUs with an MCS index ranging from 0 to 6. However, the IBLER, MCS index, and service drop rate may also increase.

BTS3900: V100R008C00

BTS3900 LTE: V100R001C00

Radio

L

RB Priority MCS Select Strategy

BTS3900, BTS3900 LTE

MOD CELLDLSCHALGO

LST CELLDLSCHALGO

Indicates how to apply the policy of increasing the number of resource blocks (RBs) to lower the modulation and coding scheme (MCS) index. If this parameter is set to SINGLEUSER_STRATEGY, the policy is applied to a single RRC_CONNECTED UE whose capability is limited (Maximum number of DL-SCH transport block bits received within a TTI of the UE is less than the maximum TBS with the total number of PRBs). The policy is applied to a single service when the following conditions are met within a measurement period: (1) this parameter is set to SINGLEUSER_STRATEGY; (2) the service is the only service to be scheduled in the cell; (3) the proportion of the transmission time intervals (TTIs) in which RBs are expected to be surplus is less than a specified threshold. If this parameter is set to MULTIUSER_STRATEGY, the policy is applied to the last capability-limited UE to be scheduled. If this parameter is set to MULTIUSER_STRATEGY and the proportion of TTIs in which RBs are expected to be surplus is less than a specified threshold within a measurement period, this strategy is applied to the last UE to be scheduled. If this parameter is set to MULTIUSR_LOWMCSLIMIT_STRATEGY, the policy is applied to the last capability-limited UE to be scheduled. If this parameter is set to MULTIUSR_LOWMCSLIMIT_STRATEGY and the proportion of TTIs in which RBs are expected to be surplus is less than a specified threshold within a measurement period, this strategy is applied to the last UE to be scheduled, and the MCS index decreases by a maximum of 3. This parameter applies only to LTE FDD networks.

NO

NO

NO

LOFD-00101501

LOFD-00101502

CQI Adjustment

Dynamic Scheduling

Enumeration Type

SINGLEUSER_STRATEGY(Single User Strategy), MULTIUSER_STRATEGY(Multiple User Strategy), MULTIUSR_LOWMCSLIMIT_STRATEGY(Multiple User Lower MCS Limited Strategy)

SINGLEUSER_STRATEGY~0, MULTIUSER_STRATEGY~1, MULTIUSR_LOWMCSLIMIT_STRATEGY~2

None

SINGLEUSER_STRATEGY, MULTIUSER_STRATEGY, MULTIUSR_LOWMCSLIMIT_STRATEGY

SINGLEUSER_STRATEGY(Single User Strategy)

SINGLEUSER_STRATEGY(Single User Strategy)

Default/Recommended Value

CellDlschAlgo

None

Read & Write

No (And no impact on the UE in idle mode)

N/A

N/A

None

The parameter modification has no impact on the equipment.

If this parameter is set to MULTIUSER_STRATEGY, throughput of capability-limited UEs in and near the cell center increases, downlink throughput also increases when the cell is lightly loaded, the small-packet service delay decreases, but interference on neighboring cells increases. If this parameter is set to MULTIUSR_LOWMCSLIMIT_STRATEGY, the number of RBs to be increased for the scheduling of small-packet services is limited, interference on neighboring cells decreases, downlink throughput increases in scenarios with medium or light loads. In this case, you are advised to set the RBPriMcsSelectRatioThd parameter to a larger value to further decrease the small-packet service delay and increase downlink throughput. If this parameter is set to SINGLEUSER_STRATEGY, the small-packet service delay decreases and throughput increases in scenarios where a single UE needs to be scheduled.

BTS3900: V100R010C10

BTS3900 LTE: V100R010C10

Radio

L

PDCCH Max Code Rate

BTS3900, BTS3900 LTE

MOD CELLPDCCHALGO

LST CELLPDCCHALGO

Indicates the maximum coding rate on the PDCCH. The coding rate on the PDCCH cannot exceed this parameter value. Otherwise the PDCCH aggregation level must be increase.

NO

NO

NO

LBFD-002003 / TDLBFD-002003

Physical Channel Management

Interval Type

75~120

N/A

None

0.75~1.2, step:0.01

75

75

Default/Recommended Value

CellPdcchAlgo

None

Read & Write

No (And no impact on the UE in idle mode)

N/A

N/A

The actual value is equal to the GUI value divided by 100. The default GUI value is 75, corresponding to an actual value of 0.75.

The parameter modification has no impact on the equipment.

If this parameter is set to a smaller value, the maximum coding rate on the PDCCH is smaller, and the PDCCH aggregation level will be higher. In this case, the PDCCH coverage is better, but the system capacity is smaller. A larger value of this parameter results in the opposite effects.

BTS3900: V100R010C00

BTS3900 LTE: V100R010C00

Radio

L