LTE Performance Parameters

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1 Uplink Resource Allocation ... 5

1.1 SRS Resource Allocation ... 5

1.1.1 SrsSubframeCfg (SRS subframe configuration) ... 5

1.1.2 SrsSubframeRecfSwitch (SRS subframe tree reconfiguration switch) ... 6

1.1.3 AnSrsSimuTrans (SRS ACK/NACK simultaneous transmission) ... 6

1.2 Uplink Scheduling ... 7

1.2.1 Scheduling in Each TTI ... 7

1.2.2 Physical Layer Measurement Result Processing ... 10

2 Downlink Resource Allocation ... 12

2.1 PUCCH Resource Allocation ... 12

2.1.1 DeltaShift (Delta Shift) ... 12

2.1.2 SriAdaptiveSwitch (SRI adaptive switch) ... 13

2.1.3 FixedSriPeriod (SRI Period) ... 13

2.1.4 PucchSwitch (PUCCH algorithm switch) ... 14

2.1.5 SriLowLoadThd (SRI Low Load Threshold) ... 15

2.2 Downlink CQI Adjustment ... 16

2.2.1 CqiAdjAlgoSwitch (CQI adjust algorithm switch) ... 16

2.3 Downlink Scheduling ... 16

2.3.1 DlschPriorityFactor (Downlink scheduling priority factor) ... 16

2.3.2 DlMinGbr (Downlink MinGBR) ... 17

2.3.3 DlschStrategy (Downlink scheduling Strategy) ... 18

2.3.4 BtServiceWeight (Bt Service Weight) ... 18

2.3.5 OtherServiceWeight (Other Service Weight) ... 19

2.4 PDCCH Resource Allocation ... 20

2.4.1 CCEUseRatio (CCE use ratio) ... 20

3 Downlink ICIC ... 22

3.1 DlIcicSwitch (DlIcic algorithm switch) ... 22

3.2 BandMode (Downlink band division scheme) ... 22

3.3 A3Offset (Downlink ICIC A3 offset) ... 23

3.4 Hysteresis (DownLink ICIC measurement hysteresis) ... 24

3.5 TimeToTrigger (DownLink ICIC measurement time to trigger) ... 24

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3.9 TriggerQuantity (DownLink ICIC measurement trigger quantity)... 27

3.10 ReportQuantity (DownLink ICIC measurement report quantity)... 28

4 Downlink MIMO ... 29

4.1 MIMOADAPTIVESWITCH (MIMO adaptive switch) ... 29

4.2 FIXEDMIMOMODE (Fixed MIMO mode) ... 29

4.3 MAXMIMORANKPARA (maximum number of MIMO layers) ... 30

5 Mobility Control ... 31

5.1 Intra-RAT Handover ... 31

5.1.1 Handover Algorithm Switch ... 31

5.1.2 Intra-RAT Handover Common Parameter ... 35

5.1.3 Intra-Frequency Handover ... 37

5.1.4 Measurement-Related Parameters ... 44

5.2 Cell Reselection Parameters ... 46

5.2.1 QRxLevMin (Minimum required RX level) ... 46

5.2.2 QRxLevMinOffset (Minimum required RX level offset) ... 46

5.2.3 QQualMin (Minimum required RX quality level) ... 47

5.2.4 QQualMinOffset (Minimum required RX quality level offset) ... 48

5.2.5 SIntraSearch (Threshold for intra frequency measurements) ... 48

5.2.6 ThrshServLow (Serving frequency lower priority threshold) ... 49

5.2.7 SNonIntraSearch (Threshold for EUTRAN inter-frequency and inter-RAT measurements) ... 50

5.2.8 SIntraSearchQ (RSRQ Threshold for intra frequency measurements)... 51

5.2.9 CellReselPriority (Cell reselection priority) ... 51

5.2.10 QRxLevMin (Minimum required RX level) ... 52

5.2.11 QqualMin (Minimum RX signal quality) ... 53

5.2.12 MeasBandWidth (Measurement bandwidth) ... 53

5.2.13 CellQoffset (Cell offset) ... 54

5.2.14 QoffsetFreq (Frequency offset) ... 55

5.2.15 Qhyst (Hysteresis value for ranking criteria) ... 55

5.2.16 TReselEutran (Cell reselection timer value for EUTRAN) ... 56

5.2.17 PMax (Max transmit power allowed) in CellResel ... 57

5.2.18 TreselectionHrpd (Cell reselection timer for HRPD) ... 58

6 Load Control... 59

6.1 Load Control Algorithm ... 59

6.1.1 UlLdcSwitch (Switch for the Uplink Load Control Algorithm) ... 59

6.1.2 DlLdcSwitch (Switch for the Downlink Load Control Algorithm) ... 60

6.2 Admission Control ... 60

6.2.1 GbrUsageSwitch (Switch for Detecting the Number of PRBs Occupied by GBR Services) ... 60

6.2.2 GbrRbUsedHighThd (GBR used resource high proportion threshold) ... 61

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6.2.6 UlRbLowThd (Uplink RB used ratio low threshold) ... 64

6.2.7 UlRbHighThd (Uplink RB used ratio high threshold) ... 64

6.2.8 MaxNonGBRBearerNum (Non-GBR max bearer number) ... 65

6.3 Random Access Control ... 66

6.3.1 RootSequenceIdx (Root sequence index) ... 66

6.3.2 PreambleFmt (Preamble format) ... 66

6.3.3 HighSpeedFlag (High speed flag) ... 67

6.4 Mapping from SIBs to SI Messages ... 67

6.4.1 SiMapSwitch (SIB mapping SI algorithm switch) ... 67

6.4.2 Sib2Period (SIB2 period) ... 68

7 Power Control ... 75

7.1 Uplink Power Control ... 75

7.1.1 PUSCH ... 75

7.1.2 PUCCH ... 77

7.1.3 PRACH ... 78

7.2 Downlink Power Control ... 80

7.2.1 PDSCH ... 80 7.2.2 PDCCH ... 86 7.2.3 PHICH ... 87 7.2.4 PCFICH ... 89 7.2.5 PBCH ... 89 7.2.6 SCH ... 90 7.2.7 PRS ... 91

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1

Uplink Resource Allocation

1.1 SRS Resource Allocation

1.1.1 SrsSubframeCfg (SRS subframe configuration)

Description

Meaning: This parameter indicates the index for initial cell-level SRS subframe configuration. Value type: enumeration

Value range: SC0(0), SC1(1), SC2(2), SC3(3), SC4(4), SC5(5), SC6(6), SC7(7), SC8(8), SC9(9), SC10(10), SC11(11), SC12(12), SC13(13), SC14(14)

Adjustment step: N/A Unit: none

Default value: SC3(3) for FDD, SC0(0) for TDD Parameter relationship: none

Impact scope: cell

Setting

The protocol specifies that the number of subframe trees is configurable within a 10-ms measurement period. If the number of UEs is small, a small amount of cell-level SRS subframe resources is configured. This reduces the usage of PUSCH resources. If the cell load is light, a small and fixed amount of cell-level SRS resources can be configured. The current algorithm supports adaptive configuration of cell-level subframes. For example, the subframes can be configured every 2 or 5 milliseconds as required. This parameter affects the configuration of cell-level SRS subframes. If the number of configured cell-level subframes increases, the uplink cell throughput decreases.

Related Commands

LST SRSCFG

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1.1.2 SrsSubframeRecfSwitch (SRS subframe tree reconfiguration

switch)

Description

Meaning: This parameter indicates whether the function of reconfiguring cell-level subframe trees is enabled. If this parameter is set to ON, the number of cell-level SRS subframes adjusts adaptively based on the cell load. If this parameter is set to OFF, the cell-level SRS subframe configuration is fixed.

Value type: enumeration Value range: ON, OFF Adjustment step: N/A Unit: none

Default value: on

Parameter relationship: none Impact scope: cell

Setting

This parameter is set to ON by default. If this parameter is set to OFF, cell-level SRS subframes cannot be reconfigured. As a result, SRS resources are unavailable to UEs that newly accessed the network.

Related Commands

LST CELLALGOSWITCH

MOD CELLALGOSWITCH: LocalCellId=x, SrsAlgoSwitch=SrsSubframeRecfSwitch-x;

1.1.3 AnSrsSimuTrans (SRS ACK/NACK simultaneous

transmission)

Description

Meaning: This parameter indicates whether the SRS and ACK/NACK (AN) or scheduling request (SR) can be transmitted in the same transmission time interval (TTI).

Value type: bool

Value range: BOOLEAN_FALSE(False), BOOLEAN_TRUE(True) Adjustment step: N/A

Unit: none

Default value: BOOLEAN_TRUE(True) Parameter relationship: none

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Setting

If this parameter is set to BOOLEAN_TRUE, the AN or SR is truncated, and the SRS and AN or SR can be transmitted in the same TTI. If this parameter is set to BOOLEAN_FALSE, the AN or SR is not truncated, and the SRS is discarded if the SRS and AN or SR are

transmitted in the same TTI.

This parameter is set to BOOLEAN_TRUE by default. This parameter can be set to

BOOLEAN_FALSE to ensure AN or SR performance if the PUCCH demodulation

performance cannot meet requirements.

If this parameter is set to BOOLEAN_TRUE, the AN or SR demodulation performance may be affected. If this parameter is set to BOOLEAN_FALSE, timeout may occur.

Related Commands

LST SRSCFG

MOD SRSCFG: LocalCellId=x, AnSrsSimuTrans=x;

1.2 Uplink Scheduling

1.2.1 Scheduling in Each TTI

1.2.1.1 UlschStrategy (Uplink Scheduling Strategy)

Description

Meaning: This parameter indicates the uplink scheduling policy that determines the

scheduling priority and the scheduling order in which UEs are arranged on the uplink. There are four uplink scheduling policies: MAX C/I, proportional fair (PF), round robin (RR), and enhanced proportional fair (EPF).

Value type: enumeration

Value range: ULSCH_STRATEGY_EPF(EPF), ULSCH_STRATEGY_MAX_CI(MAX_CI), ULSCH_STRATEGY_PF(PF), ULSCH_STRATEGY_RR(RR)

Default value: ULSCH_STRATEGY_EPF(EPF) Parameter relationship: none

Impact scope: cell

Setting

If the Max C/I scheduling policy is used, UEs for which channel quality is good are scheduled first. The spectral efficiency improves but the quality of service (QoS) and fairness cannot be ensured. The Max C/I scheduling policy can be used to verify the maximum system capacity. The RR scheduling policy ensures fairness but lowers the system capacity. This scheduling policy can be used to verify the upper threshold of system scheduling fairness. The PF

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scheduling policy balances between spectral efficiency and fairness. This scheduling policy can be used to verify the system capacity, coverage, and fairness. In the EPF scheduling policy, the QoS, system capacity, and frequency selection are balanced. The basic scheduling policies MAX C/I, PF, and RR are used in performance tests. The EPF scheduling policy is intended for commercial use.

Impact of parameter setting on network performance: If this parameter is set to

ULSCH_STRATEGY_EPF, the QoS is guaranteed, and the coverage, capacity, and fairness

are balanced. If this parameter is set to ULSCH_STRATEGY_MAX_CI, the system capacity is maximized, but the coverage, fairness, and QoS are not ensured. If this parameter is set to ULSCH_STRATEGY_PF, a tradeoff among the coverage, capacity, and fairness is reached, but the QoS is not guaranteed. If this parameter is set to ULSCH_STRATEGY_RR, the eNodeB ensures that each UE has an equal opportunity to be scheduled on the uplink, but the capacity, coverage, and QoS are not ensured.

Related Commands

LST CELLULSCHALGO

MOD CELLULSCHALGO: LocalCellId=x, UlschStrategy=ULSCH_STRATEGY_x;

1.2.1.2 PreAllocationSwitch (Pre-Allocation Switch)

Description

Meaning: This parameter indicates whether the pre-allocation algorithm is enabled. Value type: enumeration

Value range: ON, OFF Adjustment step: N/A Unit: none

Default value: on

Setting

The pre-allocation algorithm can reduce the end-to-end service latency when the uplink load is light. No resource is available for pre-allocation when the uplink load is heavy.

Parameter adjustment scenario:

 This parameter can be set to ON to decrease the end-to-end service latency.

 This parameter can be set to OFF to maintain the UE standby time during pre-allocation.

 _{This parameter can be set to OFF to clear the interference caused by pre-allocation.}

Impact of parameter setting on network performance: Setting this parameter to ON reduces the probability of UE entering the DRX state, shortens the UE standby time, and increases interference with neighboring cells.

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Related Commands

LST CELLALGOSWITCH:

MOD CELLALGOSWITCH: LocalCellId=x, UlSchSwitch=PreAllocationSwitch-x;

1.2.1.3 PreAllocationMinPeriod (minimal period of pre-allocation)

Description

Meaning: This parameter indicates the minimum interval between pre-allocations. The interval between pre-allocations of one UE must be longer than or equal to the value of this parameter. If this parameter is set to 1, a UE is pre-allocated in every TTI.

Value type: integer Value range: 1 to 10 Adjustment step: 1 Unit: ms

Default value: 5

Parameter relationship: This parameter is valid only when PreAllocationSwitch is set to ON. Impact scope: cell

Setting

This parameter is used to control the impact of pre-allocation on UE standby time. Increasing the value of this parameter reduces the number of times UEs can be pre-allocated and

increases the UE standby time. Decreasing the value of this parameter increases the number of times UEs can be pre-allocated and reduces the UE standby time.

 _{If a decrease in the pre-allocation interval is required, you are advised to decrease the}

value of this parameter.

 If an increase in the UE standby time is required, you are advised to increase the value of this parameter.

Related Commands

LST CELLULSCHALGO

MOD CELLULSCHALGO: LocalCellId=x, PreAllocationMinPeriod =x;

1.2.1.4 PreAllocationSize (data size of pre-allocation)

Description

Meaning: This parameter indicates the data amount pre-allocated to each UE. Value type: integer

Value range: 45 to 1500 Adjustment step: 1

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Unit: byte Default value: 80

Parameter relationship: This parameter is valid only when PreAllocationSwitch is set to ON. Impact scope: cell

Setting

This parameter determines the amount of bandwidth resources pre-allocated to UEs based on an estimated amount of service data. If the data amount specified by this parameter matches the service type, there is a low probability that the data is fragmented at the Media Access Control (MAC) layer. As a result, the service latency is short. If the data amount specified by this parameter is less than the actual amount of data to be transmitted, there is a high

probability that the data is fragmented at the MAC layer. As a result, the service latency is long. If the data amount specified by this parameter is greater than the actual amount of data to be transmitted, resources are wasted and interference increases.

 If the end-to-end latency is long, you are advised to increase the value of this parameter.

 _{If the transmitted data is less than the pre-allocated data amount, you are advised to}

decrease the value of this parameter until the pre-allocated data amount is equal to the transmitted data amount.

Related Commands

LST CELLULSCHALGO

1.2.2 Physical Layer Measurement Result Processing

1.2.2.1 SinrAdjustSwitch (SINR adjust switch)

Description

Meaning: This parameter indicates whether the eNodeB adjusts the SINR based on the ACK/NACK message received when HARQ is enabled on the uplink.

Default value: ON

Setting

Due to inaccurate channel evaluation, inaccurate SINR measurement, or delays, the actual channel conditions may not be suitable for the UE MCS and the measured IBLER is higher

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than the target IBLER. The eNodeB uses the SINR adjustment algorithm to counteract the measurement error.

Related Commands

LST CELLALGOSWITCH

MOD CELLALGOSWITCH: LocalCellId=x, UlSchSwitch=SinrAdjustSwitch-x;

1.2.2.2 SinrAdjustTargetIbler (SINR target IBLER adjustment)

Description

Meaning: This parameter indicates the target IBLER for the SINR adjustment algorithm. Value type: double

Value range: 1 to 99 Adjustment step: N/A Unit: %

Default value: 10

Setting

On the physical layer, the IBLER decides the SINR threshold for MCS switches, which is 10% by default. On the data link layer, the SINR adjustment increases with the IBLER. Due to the diversity combination gains, if the SINR adjustment step is large, a high-order MCS is used and system throughout increases.

Parameter adjustment scenario: This parameter must set to maximize the system throughput when HARQ and uplink SINR adjustment are enabled.

Impact of parameter setting on network performance: This parameter is set to achieve a balance between the initial MCS order and the number of retransmissions. The setting of this parameter affects cell throughput.

Related Commands

LST CELLULSCHALGO

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2

Downlink Resource Allocation

2.1 PUCCH Resource Allocation

2.1.1 DeltaShift (Delta Shift)

Description

Meaning: This parameter indicates the cyclic shift offset between two ACK or scheduling request indication (SRI) cord channels that use the same orthogonal cover (OC) code. Value type: enumeration

Value range: DS1_DELTA_SHIFT(ds1), DS2_DELTA_SHIFT(ds2), DS3_DELTA_SHIFT(ds3)

Unit: none

Default value: none

Setting

Recommended value:

 Set this parameter to DS2_DELTA_SHIFT(ds2) for a cell configured with the normal cyclic prefix (CP) when the LBBPc is used.

 _{Set this parameter to DS3_DELTA_SHIFT(ds3) for a cell configured with the extended}

CP when the LBBPc is used.

 Set this parameter to DS1_DELTA_SHIFT(ds1) for a cell configured with the normal CP when the LBBPd is used.

 Set this parameter to DS3_DELTA_SHIFT(ds3) for a cell configured with the extended CP when the LBBPd is used.

Increasing the value of this parameter reduces the maximum number of ACK or SRI UEs that an RB supports for multiplexing and reduces the PUCCH capacity. If this parameter is set to a small value, the ACK or the SRI code channels may not be orthogonal.

Related Commands

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MOD PUCCHCFG: LocalCellId=x, DeltaShift=DSX_DELTA_SHIFT;

2.1.2 SriAdaptiveSwitch (SRI adaptive switch)

Description

Meaning: This parameter indicates whether SRI periodic adjustment is enabled. Value type: enumeration

Value range: ON, OFF Adjustment step: N/A Unit: none

Default value: ON

Parameter relationship: none Impact scope: eNodeB Recommended value: ON

Setting

If this parameter is set to ON, the maximum number of SRI UEs supported in a cell increases without using more uplink control signaling resources or increasing the number of ACK or SRI cord channels. However, the average uplink scheduling delay increases when the PUCCH is heavily loaded. If this parameter is set to OFF and the number of ACK or SRI code channel remains unchanged, the maximum number of SRI UEs supported in a cell decreases.

If SRI periodic adjustment is enabled and the PUCCH is heavily loaded, more UEs can be allocated SRI resources for network access.

Related Commands

LST GLOBALPROCSWITCH;

MOD GLOBALPROCSWITCH: SriAdaptiveSwitch=x;

2.1.3 FixedSriPeriod (SRI Period)

Description

Meaning: This parameter indicates the period of SRI. Value type: enumeration

Value range: ms5, ms10, ms20, ms40 Adjustment step: N/A

Unit: ms

Default value: ms10

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Impact scope: eNodeB

Recommended value: If UEs are on an ultra-high speed train, set this parameter to ms10. For other scenarios, set the parameter based on the QCI of services. If the configuration of TDD uplink and downlink subframe ratio is 0 or 1, set this parameter to ms5 for services with QCI3 or QCI5; ms10 for services with QCI1, QCI2 or QCI7; 20ms for services with QCI4, QCI6, QCI8, or QCI9.

Setting

Increasing the value of this parameter increases the average SRI period for UEs and the maximum number of SRI UEs supported in a cell. However, the average uplink scheduling delay may increase. Decreasing the value of this parameter reduces the maximum number of SRI UEs supported in a cell.

Related Commands

LST CELLSTANDARDQCI

MOD CELLSTANDARDQCI: SriPeriod=x;

2.1.4 PucchSwitch (PUCCH algorithm switch)

Description

Meaning: This parameter indicates whether self-adaptive PUCCH resource adjustment is enabled.

Default value: ON

Recommended value: You are advised to set this parameter to OFF for UEs on ultra-high speed trains. In other scenarios, set this parameter to ON.

Setting

If this parameter is set to ON, PUCCH resource increases or decreases self-adaptively based on the load on the PUCCH, optimizing PUCCH resource utilization and reducing uplink control signaling overhead. However, when PUCCH resource decreases, the eNodeB may need to reallocate PUCCH resources to a few UEs, using more downlink resources. If this parameter is set to OFF, uplink control signaling overhead increases.

Related Commands

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MOD CELLALGOSWITCH: PucchAlgoSwitch=PucchSwitch-x;

2.1.5 SriLowLoadThd (SRI Low Load Threshold)

Description

Meaning: This parameter indicates the threshold for entering the low load state of SRI resources.

Value type: integer Value range: 0 to 50 Adjustment step: 1 Unit: none

Default value: 10

Recommended value:

 In FDD mode with the bandwidth of 1.4 MHz or 3 MHz, set this parameter to 0.

 In FDD mode with the bandwidth of 5 MHz or 10 MHz, set this parameter to 10.

 In FDD mode with the bandwidth of 15 MHz or 20 MHz, set this parameter to 20.

 _{In TDD mode with the bandwidth of 1.4 MHz or 3 MHz, set this parameter to 0.}  _{In TDD mode with the bandwidth of 5 MHz or 10 MHz, set this parameter to 10.}  _{In TDD mode with the bandwidth of 15 MHz or 20 MHz, set this parameter to 20.}

Setting

You are advised to retain the default value of the parameter. If adjustments are inevitable, do not set this parameter to a value much greater than the default value, because this may lead to incorrect decisions on the load status of SRI resources. The recommended maximum value of this parameter is 20 if the downlink bandwidth is less than 10 MHz and 40 for other

bandwidths.

Increasing the value of this parameter reduces the SRI resources in a cell. Decreasing the value of this parameter increases the SRI resources of a cell.

Related Commands

LST CELLPUCCHALGO;

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2.2 Downlink CQI Adjustment

2.2.1 CqiAdjAlgoSwitch (CQI adjust algorithm switch)

Description

Meaning: This parameter indicates whether the eNodeB is allowed to adjust the UE-reported CQIs based on the IBLER.

Value type: enumeration Value range: ON, OFF Unit: none

Default value: ON

Setting

If this parameter is set to ON, the IBLER of a UE is maintained around the target value and the system throughout is optimized. If this parameter is set to OFF, the IBLER of a UE may be much higher than the target value and the system throughout cannot be optimized.

Related Commands

LST CELLALGOSWITCH

MOD CELLALGOSWITCH: LocalCellId=x,

CqiAdjAlgoSwitch=CqiAdjAlgoSwitch-x&StepVarySwitch-0;

2.3 Downlink Scheduling

2.3.1 DlschPriorityFactor (Downlink scheduling priority factor)

Description

Meaning: This parameter indicates the weight factor used in the calculation of connection priorities during downlink scheduling.

Value type: interval Value range: 0 to 1000 Unit: 0.001

Default value: none

Parameter relationship: This parameter must be set to a value that ensures the following condition is met:



QCI6





QCI7





QCI8





QCI9_{. In addition, this parameter is valid for}

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Setting

Recommended value: 1000 for QCI6; 900 for QCI7; 800 for QCI8; 700 for QCI9

The value of this parameter is an important factor in determining the scheduling priority of a UE and the amount of physical resources that the eNodeB allocates to a UE in a period of time. Increasing the value of this parameter enhances the scheduling priority of and increases the amount of RB resources allocated for QCIx services. Decreasing the value of this

parameter lowers the scheduling priority of and reduces the amount of RB resources allocated for QCIx services.

Related Commands

LST STANDARDQCI

MOD STANDARDQCI: Qci=QCIx, DlschPriorityFactor=x;

2.3.2 DlMinGbr (Downlink MinGBR)

Description

Meaning: This parameter indicates the minimum data rate for QCIx non-GBR services. This parameter is used to guarantee that non-GBR services can be scheduled even in network congestion.

Value range: MinGbrRate_0_KB, MinGbrRate_1_KB, MinGbrRate_2_KB,

MinGbrRate_4_KB, MinGbrRate_8_KB, MinGbrRate_16_KB, MinGbrRate_32_KB, MinGbrRate_64_KB, MinGbrRate_128_KB, MinGbrRate_256_KB, MinGbrRate_512_KB Unit: kbyte/s

Default value: MinGbrRate_1_KB

Parameter relationship: The minimum data rate guaranteed for non-GBR services equals to that for GBR services. The scheduling of both non-GBR services and GBR services must be guaranteed. Therefore, this parameter must not be set too large. In addition, this parameter is valid for QCI6, QCI7, QCI8, and QCI9 services.

Setting

Increasing the value of this parameter increases the minimum data rate of QCIx services. Decreasing the value of this parameter reduces the minimum data rate of QCIx services.

Related Commands

LST STANDARDQCI

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2.3.3 DlschStrategy (Downlink scheduling Strategy)

Description

Meaning: This parameter indicates the downlink scheduling type. Value type: enumeration

Value range:

DLSCH_PRI_TYPE_EPF, DLSCH_PRI_TYPE_PF, DLSCH_PRI_TYPE_MAX_CI, DLSCH_PRI_TYPE_RR

Unit: none

Default value: DLSCH_PRI_TYPE_EPF Parameter relationship: none

Setting

If this parameter is set to DLSCH_PRI_TYPE_PF, the proportional fair algorithm is implemented and the channel quality and fairness are balanced in scheduling. If this parameter is set to DLSCH_PRI_TYPE_MAX_CI, the Max C/I algorithm is implemented and UEs with optimal channel quality are preferentially scheduled. If this parameter is set to DLSCH_PRI_TYPE_RR, the round robin algorithm is implemented and UEs in a cell are scheduled in turns.

The preceding scheduling policies are implemented regardless of UE QoS configuration. If this parameter is set to DLSCH_PRI_TYPE_EPF, the proportional fair algorithm is implemented with the QoS of services taken into consideration.

Related Commands

LST CELLDLSCHALGO;

MOD CELLDLSCHALGO: LocalCellId=x, DlschStrategy=x;

2.3.4 BtServiceWeight (Bt Service Weight)

Description

Meaning: This parameter indicates the weighting factor for BT services when DlschStrategy is set to DLSCH_PRI_TYPE_EPF.

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Parameter relationship: The value of this parameter must not be greater than the value of

OtherServiceWeight.

Impact scope: cell

Setting

The value of this parameter is an important factor in determining the scheduling priority of a UE and the amount of physical resources that the eNodeB allocates to a UE. Increasing the value of this parameter enhances the scheduling priority of and increases the amount of RB resources allocated to BT services. Decreasing the value of this parameter lowers the scheduling priority of and reduces the amount of RB resources allocated for BT services.

Related Commands

LST CELLDLSCHALGO;

MOD CELLDLSCHALGO: LocalCellId=x, BtServiceWeight=x;

2.3.5 OtherServiceWeight (Other Service Weight)

Description

Meaning: This parameter indicates the weighting factor for non-BT services when

DlschStrategy is set to DLSCH_PRI_TYPE_EPF.

Default value: 10

Parameter relationship: The value of this parameter must not be smaller than the value of

BtServiceWeight.

Impact scope: cell

Setting

The value of this parameter is an important factor in determining the scheduling priority of a UE and the amount of physical resources that the eNodeB allocates to a UE. Increasing the value of this parameter enhances the scheduling priority of and increases the amount of RB resources allocated to non-BT services. Decreasing the value of this parameter lowers the scheduling priority of and reduces the amount of RB resources allocated for non-BT services. This parameter is valid only when ServiceDiffSwitch is set to ON.

Related Commands

LST CELLDLSCHALGO;

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2.4 PDCCH Resource Allocation

2.4.1 CCEUseRatio (CCE use ratio)

Description

Meaning: This parameter indicates the upper threshold for the CCE utilization rate at each TTI.

Default value: 100

Parameter relationship: none Impact scope: eNodeB

Setting

This parameter is used to control the CCE utilization rate at each TTI. This parameter is invalid when PDCCHSymbolNumberSwitch is set to ON.

If the parameter is set too small, the number of available CCE is small. In this case, success rates of network access and CCE allocation decrease, especially for uplink scheduling. You are advised to set this parameter to a value greater than 23. The following table lists the minimum values recommended for various bandwidths.

Minimum CCE Usage Ratio 10 MHz 15 MHz 20 MHz CFI=1, Port4 100 100 100 CFI=2, Port4 100 80 60 CFI=3, Port4 65 44 32 CFI=1, Port2 100 100 100 CFI=2, Port2 100 63 50 CFI=3, Port4 58 38 28

If V MIMO and MU BF are enabled, you are advised to set this parameter to 100. Otherwise, CCE allocation for paring UEs may fail and the performance of Virtual MIMO and MU BF may be compromised.

Impact of parameter setting on network performance: Decreasing the value of this parameter may reduce the number of UEs scheduled in a TTI, reduce the uplink and downlink

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Related Commands

LST CELLPDCCHALGO;

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3

Downlink ICIC

3.1 DlIcicSwitch (DlIcic algorithm switch)

Description

Meaning: This parameter indicates whether downlink ICIC is enabled or which type of downlink ICIC algorithm is used.

Value range: DlIcicSwitch_OFF_ENUM, DlIcicDynamicSwitch_ON_ENUM, DlIcicStaticSwitch_ON_ENUM, DlIcicReuse3Switch_ON_ENUM

Unit: none

Default value: DlIcicSwitch_OFF_ENUM

Parameter relationship: Cells configured with punctured RBs and non-standard bandwidths support only static ICIC. If adaptive DL ICIC is enabled, static and dynamic DL ICIC do not take effect.

Setting

If this parameter is set to a value other than DlIcicSwitch_OFF_ENUM, the system capacity decreases, but eNodeB coverage improves.

Related Commands

LST ENODEBALGOSWITCH:;

MOD ENODEBALGOSWITCH: DlIcicSwitch=DlIcicSwitch_OFF_ENUM;

3.2 BandMode (Downlink band division scheme)

Description

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Value range: Mode1, Mode2, Mode3, Invalid Unit: none

Default value: Invalid Parameter relationship: none Impact scope: cell

Setting

This parameter is valid only when downlink ICIC is enabled.

Related Commands

LST CELLDLICIC: LocalCellId=0;

MOD CELLDLICIC: LocalCellId=0, BandMode=MODE1;

3.3 A3Offset (Downlink ICIC A3 offset)

Description

Meaning: This parameter indicates the offset for the event A3 trigger condition when

downlink ICIC is enabled. If the RSRP difference between a neighboring cell and the serving cell is greater than the value of this parameter, the UE is recognized as a CEU in the serving cell.

Value type: integer Value range: -30 to 30 Unit: 0.5 dB

Default value: -10

Setting

If this parameter is set too large, the event A3 trigger condition is hard to be met and fewer UEs report event A3 to the eNodeB. In this case, CEU performance is not guaranteed and cell capacities decrease.

If this parameter is set too small, the event A3 trigger condition is easy to be met and more UEs report event A3 to the eNodeB. As a result, a CEU cannot be located accurately based on event A3 measurement reports. In addition, more UEs are scheduled in edge bands and the average throughput of edge UEs decrease.

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Related Commands

LST CELLDLICICMCPARA: LocalCellId=0; MOD CELLDLICICMCPARA: A3Offset=-10;

3.4 Hysteresis (DownLink ICIC measurement hysteresis)

Description

Meaning: This parameter indicates the hysteresis for event A3 when downlink ICIC is enabled.

Value type: integer Value range: 0 to 30 Unit: 0.5 dB Default value: 4

Setting

If this parameter is set too large, the event A3 trigger condition is hard to be met. If this parameter is set too small, the event A3 trigger condition is easy to be met and more UEs may report event A3 to the eNodeB, reducing the throughput of CEUs and the cell.

Related Commands

LST CELLDLICICMCPARA: LocalCellId=0;

MOD CELLDLICICMCPARA: LocalCellId=0, Hysteresis=4;

3.5 TimeToTrigger (DownLink ICIC measurement time to

trigger)

Description

Meaning: This parameter indicates the length of time that a UE waits to report event A3 to the eNodeB after detecting event A3 and, during the period, the formula of event A3 stays true. A UE detects event A3 when the measurement result indicates that the entering condition or leaving condition for event A3 is met.

Value range: 0, 40, 64, 80, 100, 128, 160, 256, 320, 480, 512, 640, 1024, 1280, 2560, 5120 Unit: ms

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Default value: 640

Setting

If this parameter is set too large, the UE must wait a long period of time to report event A3 to the eNodeB after detecting event A3. If this parameter is set too small, the UE may report event A3 immediately after detecting event A3. In this case, the UE location in a cell cannot be updated in a timely manner, the ICIC effect is compromised, and the cell capacity and CEU throughout decrease.

Related Commands

MOD CELLDLICICMCPARA: TimeToTrigger=640ms;

3.6 MaxReportCellNum (Downlink ICIC measurement

max report cell number)

Description

Meaning: This parameter indicates the maximum number of neighboring cells to be included in event A3 measurement report.

Value type: integer Value range: 1 to 8 Unit: none

Default value: 8

Setting

Increasing the value of this parameter enhances the evaluation accuracy of interference on neighboring cells, improves CEU performance, and increases the average CEU throughput.

Related Commands

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3.7 ReportInterval (Downlink ICIC measurement report

interval)

Description

Meaning: This parameter indicates the interval between event A3 measurement reports that a UE sends to the eNodeB after event A3 is detected. For details, see 3GPP TS 36.331. Value type: enumeration

Value range: 120ms, 240ms, 480ms, 640ms, 1024ms, 2048ms, 5120ms, 10240ms, 1min, 6min, 12min, 30min, 60min

Unit: ms

Default value: 5120

Setting

If this parameter is set to a large value, the CEU reports event A3 to the eNodeB in a less frequent manner and the UE location is not updated efficiently. As a result, the average CEU throughput decreases. If this parameter is set to a small value, the CEU may frequently report event A3 to the eNodeB, using more band resources.

Related Commands

MOD CELLDLICICMCPARA: ReportInterval=5120ms;

3.8 ReportAmount (Downlink ICIC measurement report

amount)

Description

Meaning: This parameter indicates the number of times a CEU reports event A3 to the eNodeB. A CEU stops reporting event A3 when the number of times it has reported event A3 reaches the value of this parameter.

Value range: 1, 2, 4, 8, 16, 32, 64, infinity Unit: none

Default value: infinity Parameter relationship: none Impact scope: eNodeB

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Setting

If this parameter is not set to infinity, a CEU may be recognized as a CCU.

Related Commands

MOD CELLDLICICMCPARA: ReportAmount=Infinity;

3.9 TriggerQuantity (DownLink ICIC measurement

trigger quantity)

Description

Meaning: This parameter indicates the source from which the UE obtains the signal received power of a neighboring cell and the serving cell. Then, the UE applies these two values in the event A3 formula to determine whether the event A3 trigger condition is met.

Value type: enumeration Value range: RSRP, RSRQ Unit: none

Default value: RSRP Parameter relationship: none Impact scope: eNodeB

Setting

If this parameter is set to RSRP, the obtained signal received power does not dramatically fluctuate with the cell load. If this parameter is set to RSRQ, the obtained signal received power dramatically fluctuates with the cell load but the signal quality can be reflected in real time.

Changing the value of this parameter changes the event A3 trigger condition.

Related Commands

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3.10 ReportQuantity (DownLink ICIC measurement report

quantity)

Description

Meaning: This parameter indicates the quantity to be included in the event A3 measurement report when downlink ICIC is enabled. The quantity can be RSRP, RSRQ, or both. Value type: enumeration

Value range: SAME_AS_TRIG_QUAN(The same as TriggerQuantity), BOTH(Both) Unit: none

Default value: SAME_AS_TRIG_QUAN Parameter relationship: none

Setting

If this parameter is set to SAME_AS_TRIG_QUAN, the report quantity included in the event A3 measurement report is the same as that specified by TriggerQuantity. If this parameter is set to BOTH, both the RSRP and RSRQ are included in the event A3 measurement report and TriggerQuantity is invalid. For details, see 3GPP TS 36.331.

Related Commands

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4

Downlink MIMO

4.1 MIMOADAPTIVESWITCH (MIMO adaptive switch)

Description

Meaning: This parameter indicates the type of adaptive MIMO for a multi-antenna eNodeB. Value type: enumeration

Value range: NO_ADAPTIVE(NO_ADAPTIVE), OL_ADAPTIVE(OL_ADAPTIVE), CL_ADAPTIVE(CL_ADAPTIVE), OC_ADAPTIVE(OC_ADAPTIVE)

Unit: none

Default value: OL_ADAPTIVE(OL_ADAPTIVE)

Parameter relationship: This parameter is valid only when BFALGOSWITCH is set to OFF. Impact scope: cell

Setting

This parameter specifies the transmission modes applicable to UEs served by a multi-antenna eNodeB in TDD mode. This parameter has an impact on cell throughput and coverage.

Related Commands

LST MIMOADAPTIVEPARACFG:;

MOD MIMOADAPTIVEPARACFG:MIMOADAPTIVESWITCH=x;

4.2 FIXEDMIMOMODE (Fixed MIMO mode)

Description

Meaning: This parameter indicates the fixed MIMO mode of a multi-antenna eNodeB in TDD mode.

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Value range: TM2(TM2), TM3(TM3), TM4(TM4), TM6(TM6) Unit: none

Default value: TM3

Parameter relationship: This parameter is valid only when BFALGOSWITCH is set to OFF and MIMOADAPTIVESWITCH is set to NO_ADAPTIVE.

Impact scope: cell

Setting

This parameter specifies the transmission modes applicable to UEs served by a multi-antenna eNodeB in TDD mode. This parameter has an impact on cell throughput and coverage.

Related Commands

LST MIMOADAPTIVEPARACFG:;

MOD MIMOADAPTIVEPARACFG:FIXEDMIMOMODE=x;

4.3 MAXMIMORANKPARA (maximum number of

MIMO layers)

Description

Meaning: This parameter indicates the maximum number of layers (Rank) in MIMO implementation during downlink scheduling.

Value range: SW_MAX_SM_RANK_1, SW_MAX_SM_RANK_2, SW_MAX_SM_RANK_4

Unit: none

Default value: SW_MAX_SM_RANK_1 (A license for 2 x 2 MIMO is not provided by default.)

Parameter relationship: Setting this parameter to SW_MAX_SM_RANK_4 requires that the eNodeB be configured with a minimum of four transmit antennas.

Impact scope: cell

Setting

This parameter has a great impact on the throughput performance of MIMO technology.

Related Commands

LST CELLDLSCHALGO:;

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5

Mobility Control

5.1 Intra-RAT Handover

5.1.1 Handover Algorithm Switch

5.1.1.1 IntraFreqCoverHoSwitch (Coverage-Based Intra-Freq HO Algo

Switch)

Description

Meaning: This parameter indicates whether the coverage-based intra-frequency handover algorithm is enabled. This parameter is used to control seamless coverage between intra-frequency cells.

Default value: ON

Parameter relationship: none Impact scope: eNodeB Scenario-based parameter: no

Setting

Recommended value: ON

If this parameter is set to ON, UEs can be handed over to an intra-frequency neighboring cell. If this parameter is set to OFF, UEs cannot be handed over to an intra-frequency neighboring cell.

Impact of parameter setting on network performance: If this parameter is set to ON, seamless coverage between intra-frequency cells is guaranteed and user experience improves. If this parameter is set to OFF, seamless coverage between intra-frequency cells cannot be guaranteed.

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Related Commands

LST ENODEBALGOSWITCH

MOD ENODEBALGOSWITCH: HoAlgoSwich=IntraFreqCoverHoSwitch-1;

5.1.1.2 InterFreqCoverHoSwitch (Coverage-Based Inter-Freq HO Algo

Switch)

Description

Meaning: This parameter indicates whether the coverage-based inter-frequency handover algorithm is enabled. This parameter is used to control seamless coverage between inter-frequency cells.

Default value: ON

Setting

If this parameter is set to ON, UEs can be handed over to an inter-frequency neighboring cell. If this parameter is set to OFF, UEs cannot be handed over to an inter-frequency neighboring cell.

Impact of parameter setting on network performance: If this parameter is set to ON, seamless coverage between inter-frequency cells is guaranteed and user experience improves. If this parameter is set to OFF, seamless coverage between inter-frequency cells cannot be guaranteed.

Related Commands

LST ENODEBALGOSWITCH

MOD ENODEBALGOSWITCH: HoAlgoSwich=InterFreqCoverHoSwitch-1;

5.1.1.3 BlindHoSwitch (Blind HO Switch)

Description

Meaning: This parameter indicates whether the blind handover algorithm is enabled. Value type: enumeration

Value range: ON, OFF Adjustment step: N/A

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Unit: none

Default value: OFF

Setting

Recommended value: OFF

A blind handover is triggered when there is not enough time for GAP measurement. If this parameter is set to ON, a UE skips GAP measurement and selects the cell with the highest priority from the neighboring cell list. However, the handover success rate cannot be guaranteed. If this parameter is set to OFF, a UE can be handed over only after the eNodeB receives the measurement report from the UE and determines that the condition for a handover is met.

Parameter adjustment scenario: Set this parameter to ON when there is not enough time for GAP measurement and no requirement for the handover success rate.

Impact of parameter setting on network performance: If this parameter is set to ON, handovers are performed in a timely manner, but the handover success rate may be compromised.

Related Commands

LST ENODEBALGOSWITCH:;

MOD ENODEBALGOSWITCH: HoModeSwitch=BlindHoSwitch-1;

5.1.1.4 FreqPriorIFHOSwitch (Based on Frequency Priority HO Switch)

Description

Meaning: This parameter indicates the frequency-priority-based inter-frequency handover switch.

Default value: OFF

Scenario-based parameter: no

Setting

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This parameter applies only to handovers between inter-frequency co-coverage cells when one frequency is preferred for carrying services of UEs handed over from low-priority frequencies.

If this parameter is set to ON, an inter-frequency handover based on frequency priorities will be triggered even when the signal quality of the serving cell is good. If this parameter is set to

OFF, inter-frequency handovers based on frequency priorities are disabled.

Impact of parameter setting on network performance: If this parameter is set to ON, a UE is handed over to another frequency based on frequency priorities. In this case, the number of handovers increases, but the UE data rate also increases.

Related Commands

LST CELLALGOSWITCH:;

MOD CELLALGOSWITCH: FreqPriorityHoSwitch=FreqPriorIFHOSwitch-1

5.1.1.5 FreqPriorityIFBlindHoSwitch (Frequency Priority-Based Blind HO

Switch)

Description

Meaning: This parameter indicates whether the handover based on the frequency priority is blind.

Default value: ON

Parameter relationship: This parameter is valid only when FreqPriorIFHOSwitch is set to

ON.

Impact scope: cell

Setting

If this parameter is set to ON, the handover based on the frequency priority is blind. If this parameter is set to OFF, the handover based on the frequency priority requires GAP measurement.

A blind handover is triggered when there is not enough time for GAP measurement. If this parameter is set to ON, a UE skips GAP measurement and selects the cell with the highest priority from the neighboring cell list. However, the handover success rate cannot be guaranteed. If this parameter is set to OFF, a UE can be handed over only after the eNodeB receives the measurement report from the UE and determines that the condition for a handover is met.

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Set this parameter to ON if fast handover is required. In addition, set a high threshold for event A1 to guarantee the handover success rate. This reduces the number of UEs to be handed over to high priority cells and increases the probability for low priority cells to be heavily loaded.

Related Commands

LST CELLALGOSWITCH:;

MOD CELLALGOSWITCH: FreqPriorityHoSwitch=FreqPriorIFBlindHOSwitch-1;

5.1.2 Intra-RAT Handover Common Parameter

5.1.2.1 IntraRATHoMaxRprtCell (Max report cell number)

Description

Meaning: This parameter indicates the maximum number of cells to be included in a handover measurement report. For details, see 3GPP TS 36.331.

Default value: 4

Setting

Recommended value: 4

This parameter is used to limit the number of cells included in a handover measurement report to reduce air interface overhead. Handovers can be triggered by event A1, A2, A3, and A4. Parameter adjustment scenario: Decrease the value of this parameter if band resources are limited and the cell is heavily loaded.

Impact of parameter setting on network performance: Decreasing the value of this parameter reduces the number of candidate target cells, the probability of triggering handovers, and air interface overhead. Increasing the value of this parameter increases the number of candidate target cells and the probability of triggering handovers.

Related Commands

LST INTRARATHOCOMM:;

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5.1.2.2 IntraRATHoRprtAmount (Measurement report amount)

Description

Meaning: This parameter indicates the number of times that the UE sends the periodic measurement report to the eNodeB after an intra-frequency or inter-frequency handover is triggered. It is used to ensure that the eNodeB receives the measurement report and handovers are not affected by internal processing failures. For details, see 3GPP TS 36.331.

Value range: r1(1), r2(2), r4(4), r8(8), r16(16), r32(32), r64(64), Adjustment step: N/A

Unit: none

Default value: infinity(infinity) Parameter relationship: none Impact scope: eNodeB Scenario-based parameter: no

Setting

Recommended value: infinity(infinity)

According to the handover algorithm, if a handover is triggered by event A3 or event A4, the eNodeB sends a handover request to the target cell to apply for resources. If the handover fails, the UE sends another handover request to the eNodeB after the report interval of the related event. If periodic event reporting is enabled, a UE sends another handover request after being denied due to full load on the target cell. Increasing the value of this parameter increases the number of times that a UE can initiate a handover and increases the probability for the UE to be handed over to another cell. If this parameter is set to infinity, the number of times that a UE sends the periodic measurement report to the eNodeB is unlimited.

Parameter adjustment scenario: If the quality of air interfaces is good enough, or if the UE does not need to perform handover retries, decrease the value of this parameter.

Impact of parameter setting on network performance: Increasing the value of this parameter increases the handover success rate. However, if this parameter is set too large, a lot of signaling messages are generated, wasting air interface resources. Decreasing the value of this parameter reduces the times that a UE initiates handovers. In this case, a UE may stay at the cell edge all the time and the QoS cannot be satisfied.

Related Commands

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5.1.3 Intra-Frequency Handover

5.1.3.1 Intra-Frequency Handover Common Parameter

5.1.3.1.1 IntraFreqHoRprtInterval (A3 measurement report interval)

Description

Meaning: This parameter indicates the interval at which periodic measurement reports are sent after an intra-frequency handover event is triggered. For details, see 3GPP TS 36.331. Value type: enumeration

Value range: 120ms(120 ms), 240ms(240 ms), 480ms(480 ms), 640ms(640 ms), 1024ms(1024 ms), 2048ms(2048 ms), 5120ms(5120 ms), 10240ms(10240 ms), 1min(1 minute), 6min(6 minutes), 12min(12 minutes), 30min(30 minutes), 60min(60 minutes)

Adjustment step: N/A Unit: ms/min

Default value: 240ms(240 ms) Parameter relationship: none Impact scope: eNodeB Scenario-based parameter: no

Setting

Recommended value: 240ms(240 ms)

Delay for signaling message transmission and processing exists. Therefore, if this parameter is set too small, the UE may not obtain the handover result before sending another periodic measurement report and air interface overhead increases; if this parameter is set too large, the delay for handover retry is long and the handover success rate may be compromised. Parameter adjustment scenario: Increase the value of this parameter if a longer interval for sending periodic measurement reports is required. Decrease the value of this parameter if a shorter interval for sending periodic measurement reports is required.

Related Commands

MOD INTRARATHOCOMM: IntraFreqHoRprtInterval=240ms;

5.1.3.1.2 IntraFreqHoA3RprtQuan (A3 measurement report quantity)

Description

Meaning: This parameter indicates the quantity to be included in the measurement report for an intra-frequency handover. The quantity can be RSRP, RSRQ, or both. For details, see

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Value range: SAME_AS_TRIG_QUAN(The same as TriggerQuantity), BOTH(Both) Adjustment step: N/A

Unit: none

Default value: SAME_AS_TRIG_QUAN(The same as TriggerQuantity) Parameter relationship: none

Impact scope: eNodeB Scenario-based parameter: no

Setting

Recommended value: SAME_AS_TRIG_QUAN(The same as TriggerQuantity)

Parameter adjustment scenario: When event A3 is triggered, the default quantity included in the measurement report is the same as that specified by IntraFreqHoA3TrigQuan of which the default value is RSRP. The eNodeB generates a list of target cells based on the reported quantity. Set this parameter to BOTH if the eNodeB must make a handover decision based on both RSRP and RSRQ.

Impact of parameter setting on network performance: The measurement result based on the RSRP does not dramatically fluctuate with the cell load. The measurement result based on the RSRQ dramatically fluctuates with the cell load, but reflects the real-time signal quality of the serving cell.

Related Commands

LST INTRARATHOCOMM

MOD INTRARATHOCOMM: IntraFreqHoA3RprtQuan=SAME_AS_TRIG_QUAN;

5.1.3.1.3 IntraFreqHoA3TrigQuan (A3 measurement trigger quantity)

Description

Meaning: This parameter indicates the quantity used to evaluate the triggering condition for an intra-frequency handover. The quantity can be RSRP or RSRQ. For details, see 3GPP TS

36.331.

Value range: RSRP(for EUTRAN only), RSRQ(for EUTRAN only) Adjustment step: N/A

Unit: none

Default value: RSRP(for EUTRAN only) Parameter relationship: none

Impact scope: eNodeB Scenario-based parameter: no

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Setting

Recommended value: RSRP(for EUTRAN only)

The measurement result based on the RSRP does not dramatically fluctuate with the cell load. The measurement result based on the RSRQ dramatically fluctuates with the cell load, but reflects the real-time signal quality of the serving cell.

If this parameter is set to RSRP, the number of unnecessary handovers triggered due to unstable measurement results reduces.

Related Commands

MOD INTRARATHOCOMM: IntraFreqHoA3TrigQuan=RSRP;

5.1.3.1.4 QoffsetFreq (Intra frequency offset)

Description

Meaning: This parameter indicates the frequency offset of an intra-frequency neighboring cell.

Value range: dB-24(-24dB), dB-22(-22dB), dB-20(-20dB), dB-18(-18dB), dB-16(-16dB), dB-14(-14dB), dB-12(-12dB), dB-10(-10dB), dB-8(-8dB), dB-6(-6dB), dB-5(-5dB), dB-4(-4dB), dB-3(-3dB), dB-2(-2dB), dB-1(-1dB), dB0(0dB), dB1(1dB), dB2(2dB), dB3(3dB), dB4(4dB), dB5(5dB), dB6(6dB), dB8(8dB), dB10(10dB), dB12(12dB), dB14(14dB), dB16(16dB), dB18(18dB), dB20(20dB), dB22(22dB), dB24(24dB) Adjustment step: N/A

Unit: dB

Default value: dB0(0dB) Parameter relationship: none Impact scope: cell

Setting

Recommended value: dB0(0dB)

This parameter is provided in 3GPP TS 36.331.

Event A3 trigger condition: Mn + Ofn + Ocn – Hys > Ms + Ofs + Ocs + Off

Ofs and Ofn are the offsets of serving cell and the neighboring cell, respectively. They are set

to determine the frequency to which a UE is preferentially handed over, and they are used to evaluate the entering condition and the leaving condition of event A3. Increasing the value of this parameter enhances the frequency priority.

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The eNodeB does not send measurement control information to a UE if the measurement offset of an intra-frequency cell that served by another eNodeB is 0. However, the neighboring relationship remains unchanged.

Impact of parameter setting on network performance: Increasing the value of this parameter enhances the frequency priority. If Ofs is large, the serving cell priority is high, and the event A3 trigger condition is hard to be met. Therefore, handovers are delayed. If Ofn is large, the event A3 trigger condition is easy to be met. Therefore, unnecessary handovers may be performed.

Related Commands

LST EUTRANINTERNFREQ:;

MOD EUTRANINTERNFREQ: QoffsetFreq=dB0;

5.1.3.2 IntraFreqHO Qci

5.1.3.2.1 IntraFreqHoA3Hyst (Intrafreq handover hysteresis)

Description

Meaning: This parameter indicates the hysteresis for an intra-frequency handover. This parameter is used to reduce ping-pong handovers caused by RSRP fluctuation. For details, see

3GPP TS 36.331.

Value type: integer Value range: 0 to 30 Adjustment step: 1 Unit: 0.5 dB Default value: 2

Setting

Mn is the measurement result of the neighboring cell. Ofn is the frequency-specific offset of

the neighboring cell frequency. Ocn is the cell-specific offset of the neighboring cell. Ofs is the frequency-specific offset of the serving cell frequency. Ocs is the cell-specific offset of the serving cell. Off is the offset for this event. Hys is the hysteresis for this event.

Increasing the value of this parameter for a cell with a large fading variance reduces the number of unnecessary handovers. Decreasing the value of this parameter ensures that handovers are performed in a timely manner.

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Impact of parameter setting on network performance: Increasing Hys reduces the number of times that event A3 is triggered and delays handovers. Therefore, user experience is affected. However, reducing Hys increases the number of times that event A3 is triggered, which may lead to unnecessary handovers and ping-pong handovers.

Related Commands

LST INTRAFREQHOGROUP:;

MOD INTRAFREQHOGROUP: LocalCellId=x, IntraFreqHoGroupId=x, IntraFreqHoA3Hyst=2;

5.1.3.2.2 IntraFreqHoA3Offset (Intrafreq handover offset)

Description

Meaning: This parameter indicates the offset between the serving cell and the neighboring cell in an intra-frequency handover. This parameter is used to define the event A3 trigger

condition. For details, see 3GPP TS 36.331. Value range: -30 to 30

Adjustment step: 1 Unit: 0.5 dB Default value: 2

Setting

Off equals to the value of this parameter and is used to define the event A3 trigger condition.

Impact of parameter setting on network performance: If this parameter is set to a large value, the event A3 trigger condition is hard to be met. Therefore, handovers are delayed. If this parameter is set to a small value, the event A3 trigger condition is easy to be met. Therefore, unnecessary handovers may be performed.

Related Commands

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5.1.3.2.3 IntraFreqHoA3TimeToTrig (Intrafreq handover time to trigger)

Description

Meaning: This parameter indicates the delay for intra-frequency handovers. When the event A3 trigger condition is met, the UE waits a period of time before reporting event A3 to the eNodeB and, during this period, the formula of event A3 stays true. In this case, both the number of unnecessary handovers and the number of average handovers decreases. Value type: enumeration

Value range: 0ms(0 ms), 40ms(40 ms), 64ms(64 ms), 80ms(80 ms), 100ms(100 ms), 128ms(128 ms), 160ms(160 ms), 256ms(256 ms), 320ms(320 ms), 480ms(480 ms), 512ms(512 ms), 640ms(640 ms), 1024ms(1024 ms), 1280ms(1280 ms), 2560ms(2560 ms), 5120ms(5120 ms)

Adjustment step: N/A Unit: ms

Default value: 320ms(320 ms) Parameter relationship: none Impact scope: cell

Setting

Recommended value: 320ms(320 ms)

Parameter adjustment scenario: If UEs in a cell move at a high speed, you are advised to set this parameter to a small value, because handover delay may increase the call drop rate. If UEs in a cell move at a low speed, you can increase the value of this parameter to prevent ping-pong handovers and unnecessary handovers.

Impact of parameter setting on network performance: Increasing the value of this parameter reduces the number of handovers, but may increase the call drop rate. This parameter has an impact on the network only when its value is equal to or greater than 200 ms, because 3GPP protocols specify that the measurement result on the physical layer is updated every 200 ms.

Related Commands

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5.1.3.3 Intra-freq HO Cell

5.1.3.3.1 CellSpecificOffset (Cell specific offset)

Description

Meaning: This parameter indicates the cell-specific offset of the serving cell. It is used to determine the border between a neighboring cell and the serving cell.

Value range: dB-24(-24dB), dB-22(-22dB), dB-20(-20dB), dB-18(-18dB), dB-16(-16dB), dB-14(-14dB), dB-12(-12dB), dB-10(-10dB), dB-8(-8dB), dB-6(-6dB), dB-5(-5dB), dB-4(-4dB), dB-3(-3dB), dB-2(-2dB), dB-1(-1dB), dB0(0dB), dB1(1dB), dB2(2dB), dB3(3dB), dB4(4dB), dB5(5dB), dB6(6dB), dB8(8dB), dB10(10dB), dB12(12dB), dB14(14dB), dB16(16dB), dB18(18dB), dB20(20dB), dB22(22dB), dB24(24dB) Adjustment step: N/A

Unit: dB

Setting

Ocs equals to the value of this parameter and is used to define the trigger condition of event

A3.

Impact of parameter setting on network performance: If this parameter is set to a large value, the event A3 trigger condition is hard to be met. Therefore, handovers are delayed. If this parameter is set to a small value, the event A3 trigger condition is easy to be met. Therefore, unnecessary handovers may be performed.

Related Commands

LST CELL

MOD CELL: LocalCellId=x, CellSpecificOffset=dB0;

5.1.3.3.2 CellIndividualOffset (Cell individual offset)

Description

Meaning: This parameter indicates the cell-specific offset of the neighboring cell. It is used to define the trigger condition of event A3.

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Value type: enumeration Value range: dB-24(-24dB), dB-22(-22dB), dB-20(-20dB), dB-18(-18dB), dB-16(-16dB), dB-14(-14dB), dB-12(-12dB), dB-10(-10dB), dB-8(-8dB), dB-6(-6dB), dB-5(-5dB), dB-4(-4dB), dB-3(-3dB), dB-2(-2dB), dB-1(-1dB), dB0(0dB), dB1(1dB), dB2(2dB), dB3(3dB), dB4(4dB), dB5(5dB), dB6(6dB), dB8(8dB), dB10(10dB), dB12(12dB), dB14(14dB), dB16(16dB), dB18(18dB), dB20(20dB), dB22(22dB), dB24(24dB) Adjustment step: N/A

Unit: dB

Setting

Ocn equals to the value of this parameter and is used to define the event A3 trigger condition.

Impact of parameter setting on network performance: If this parameter is set to a large value, the event A3 trigger condition is easy to be met. Therefore, unnecessary handovers may be performed. If this parameter is set to a small value, the event A3 trigger condition is hard to be met. Therefore, handovers are delayed.

Related Commands

LST EUTRANINTRAFREQNCELL:;

MOD EUTRANINTRAFREQNCELL: LocalCellId=x, Mcc=x, Mnc=x, eNodeBId=x, CellId=x, CellIndividualOffset=dB0;

5.1.4 Measurement-Related Parameters

5.1.4.1 GapPatternType (GAP measurement pattern)

Description

Meaning: This parameter indicates the GAP measurement pattern that the eNodeB specifies based on the GAP pattern ID. For details, see 3GPP TS 36.331.

Value range: GAP_PATTERN_TYPE_1(GAP type 1), GAP_PATTERN_TYPE_2(GAP type 2)

(45)

Default value: GAP_PATTERN_TYPE_1(GAP type 1) Parameter relationship: none

Impact scope: cell

Setting

Recommended value: GAP_PATTERN_TYPE_1(GAP type 1)

If this parameter is set to GAP_PATTERN_TYPE_1, the measurement takes 6 ms and is performed every 40 ms. If this parameter is set to GAP_PATTERN_TYPE_2, the measurement takes 6 ms and is performed every 80 ms.

Impact of parameter setting on network performance: This parameter has an impact on the GAP measurement speed.

Related Commands

LST HOMEASCOMM:;

MOD HOMEASCOMM: GapPatternType=GAP_PATTERN_TYPE_1;

5.1.4.2 EutranFilterCoeffRSRP (EUTRAN RSRP filter coefficient)

Description

Meaning: This parameter indicates the layer3 filtering coefficient for RSRP measurement on EUTRAN.

Value range: FC0(FC0), FC1(FC1), FC2(FC2), FC3(FC3), FC4(FC4), FC5(FC5), FC6(FC6), FC7(FC7), FC8(FC8), FC9(FC9), FC11(FC11), FC13(FC13), FC15(FC15), FC17(FC17), FC19(FC19)

Default value: FC6(FC6) Parameter relationship: none Impact scope: cell

Setting

If this parameter is set to a large value, the RSRP measurement result at the physical layer has a small impact on the measurement value after signal filtering. Therefore, the measurement value after signal filtering does not dramatically fluctuate with the radio channel condition changes, and the number of event measurement reports decreases.

LTE Performance Parameters

Contents

1 Uplink Resource Allocation ... 5

2 Downlink Resource Allocation ... 12

3 Downlink ICIC ... 22

4 Downlink MIMO ... 29

5 Mobility Control ... 31

6 Load Control... 59

7 Power Control ... 75

1

Uplink Resource Allocation

1.1 SRS Resource Allocation

1.1.1 SrsSubframeCfg (SRS subframe configuration)

Description

Setting

Related Commands

1.1.2 SrsSubframeRecfSwitch (SRS subframe tree reconfiguration

switch)

Description

Setting

Related Commands

1.1.3 AnSrsSimuTrans (SRS ACK/NACK simultaneous

transmission)

Description

Setting

Related Commands

1.2 Uplink Scheduling

1.2.1 Scheduling in Each TTI

1.2.1.1 UlschStrategy (Uplink Scheduling Strategy)

Description

Setting

Related Commands

1.2.1.2 PreAllocationSwitch (Pre-Allocation Switch)

Description

Setting

Related Commands

1.2.1.3 PreAllocationMinPeriod (minimal period of pre-allocation)

Description

Setting

Related Commands

1.2.1.4 PreAllocationSize (data size of pre-allocation)

Description

Setting

Related Commands

1.2.2 Physical Layer Measurement Result Processing

1.2.2.1 SinrAdjustSwitch (SINR adjust switch)

Description

Setting

Related Commands

1.2.2.2 SinrAdjustTargetIbler (SINR target IBLER adjustment)

Description

Setting

Related Commands

2

Downlink Resource Allocation

2.1 PUCCH Resource Allocation

2.1.1 DeltaShift (Delta Shift)

Description

Setting

Related Commands

2.1.2 SriAdaptiveSwitch (SRI adaptive switch)

Description

Setting

Related Commands

2.1.3 FixedSriPeriod (SRI Period)

Description

Setting

Related Commands

2.1.4 PucchSwitch (PUCCH algorithm switch)

Description

Setting

Related Commands

2.1.5 SriLowLoadThd (SRI Low Load Threshold)

Description

Setting

Related Commands

2.2 Downlink CQI Adjustment

2.2.1 CqiAdjAlgoSwitch (CQI adjust algorithm switch)

Description

Setting