Number of Successful TTI Switchovers with Various Causes During RB Reconfiguration in a Cell(2ms to 10ms)

Measurement Counters

ID Counter Description

73424209 VS.HSUPA.TTI2to10.ADMCE.Succ Number of Successful TTI Switchovers Based on Admitted CEs During RB Reconfiguration in a Cell(2ms to 10ms)

73424210 VS.HSUPA.TTI2to10.COVER.Succ Number of Successful TTI Switchovers Based on Coverage During RB Reconfiguration in a Cell(2ms to 10ms)

73424211 VS.HSUPA.TTI2to10.ResRTWP.Succ Number of Successful TTI Switchovers Based on RTWP During RB Reconfiguration in a Cell(2ms to 10ms)

73424212 VS.HSUPA.TTI2to10.ResUsedCE.Succ

Number of Successful TTI Switchovers Based on Number of Occupied CEs During RB Reconfiguration in a Cell(2ms to 10ms)

73424471 VS.HSUPA.TTI2to10.ResIUB.Succ Number of Successful TTI Switchovers Based on Iub Resources During RB Reconfiguration in a Cell(2ms to 10ms)

Description

These counters provide the number of successful TTI switchovers from 2 ms to 10 ms during RB reconfiguration in an HSUPA serving cell. For DC-HSUPA UEs, the RNC calculates the number of such successful switchovers in the cells with the primary carriers.Measurement point

At measurement point B shown in the following figure, when the UE sends the RNC a RADIO BEARER RECONFIGURATION COMPLETE message, a specific counter is increased by one if the UE performs a successful TTI switchover from 2 ms to 10 ms in its HSUPA serving cell. This counter is determined by the specific TTI switchover cause.

Figure 1 RB reconfig procedure

Formula

NoneUnit

NoneRelated Features

Counter Feature ID Feature Name

VS.HSUPA.TTI2to10.ADMCE.SuccWRFD-01061404 HSUPA 2ms/10ms TTI

Handover

VS.HSUPA.TTI2to10.COVER.Succ WRFD-010690WRFD-01061404

TTI Switch for BE Services Based on CoverageHSUPA 2ms/10ms TTI Handover

VS.HSUPA.TTI2to10.ResRTWP.Succ WRFD-01061404 HSUPA 2ms/10ms TTI Handover

VS.HSUPA.TTI2to10.ResUsedCE.Succ

WRFD-01061404 HSUPA 2ms/10ms TTI Handover

VS.HSUPA.TTI2to10.ResIUB.Succ WRFD-01061404 HSUPA 2ms/10ms TTI Handover

DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH: When the switch is on, the TTI dynamic adjustment algorithm is supported for admission CE-based BE services.

DRA_BASE_COVER_BE_TTI_RECFG_SWITCH: When the switch is on, the TTI dynamic adjustment algorithm is supported for coverage-based BE services.DRA_BASE_RES_BE_TTI_RECFG_SWITCH: When the switch is on, the TTI dynamic adjustment algorithm is supported for differentiation-based BE services.DRA_HSUPA_DCCC_SWITCH: When the switch is on, the DCCC algorithm is used for HSUPA. The DCCC switch must be also on before this switch takes effect.DRA_HSUPA_STATE_TRANS_SWITCH: When the switch is on, the status of the UE RRC that carrying HSUPA services can be changed to CELL_FACH at the RNC. If a PS BE service is carried over the E-DCH, the switch PS_BE_STATE_TRANS_SWITCH should be on simultaneously. If a PS real-time service is carried over the E-DCH, the switch PS_NON_BE_STATE_TRANS_SWITCH should be on simultaneously.

DRA_BASE_RES_BE_TTI_INIT_SEL_SWITCH: Whether initial TTI selection is allowed for differentiated BE services based on fairness

0: This switch is turned off. The TTI is selected according to the original algorithm.1: This switch is turned on. In the dynamic TTI adjustment algorithm for differentiated BE services based on fairness, HSUPA UEs use 10-ms TTI if the RTWP, occupied Iub bandwidth, or consumed CE resources are congested.

DRA_BASE_COVER_BE_TTI_INIT_SEL_SWITCH: Whether to activate the coverage-based initial TTI selection algorithm specific to BE services. When this switch is turned on and conditions on 2 ms TTI specific to BE services has been met, the RNC determines uplink coverage wideness of specific cells based on the Ec/N0 values reported by UEs during RRC connection. If the uplink coverage of the cells is weak, the RNC allocates a 10 ms TTI to BE services as their initial TTI.Parameter Relationship: 1.DRA_THROU_DCCC_SWITCH,DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH,DRA_BASE_COVER_BE_TTI_RECFG_SWITCH (tính năng Configuring TTI Switch for BE ServicesBased on Coverage)DRA_BASE_RES_BE_TTI_RECFG_SWITCH (UL layer 2)

DRA_HSUPA_DCCC_SWITCH are valid when DRA_DCCC_SWITCH is set to ON;

2. For BE service,DRA_HSDPA_STATE_TRANS_SWITCH DRA_HSUPA_STATE_TRANS_SWITCH are valid when DRA_PS_BE_STATE_TRANS_SWITCH is set to ON; 4. DRA_BASE_COVER_BE_TTI_INIT_SEL_SWITCH:This switch takes effect only when DRA_BASE_COVER_BE_TTI_RECFG_SWITCH is turned on. Cần phải có tính năng TTI Switch for BE Services Based on Coverage

Impact on Network Performance: 1. In scenarios with CS and PS combined services, turning on DRA_CSPS_NO_PERIOD_RETRY_SWITCH reduces call drops of the CS services under any of the following conditions: -Each carrier is configured with different capabilities in a multi-carrier network. -The parameter HsupaCMPermissionInd in the SET UCMCF command is set to Limited. -HSPA is not supported on the Iur interface. 2. DRA_SMART_FAST_STATE_TRANS_SWITCH: If this switch is turned on, DCH utilization is improved. 3. DRA_PCH_UE_SMART_P2D_SWITCH: If this switch is turned on, FACH utilization and PS user experiment are improved. 4. DRA_BASE_RES_BE_TTI_INIT_SEL_SWITCH: When this switch is turned on and there are many

HSUPA UEs, the average UE throughput is low. In this case, the use of 10-ms TTI upon congestion may reduce the number of 2-ms to 10-ms TTI reconfiguration times, reducing the service drop rate. When this switch is turned on and there are few HSUPA UEs, the average UE throughput is high. In this case, the use of 10-ms TTI upon congestion may increase the number of 10-ms to 2-ms TTI reconfiguration times, increasing the service drop rate. 5. DRA_BASE_COVER_BE_TTI_INIT_SEL_SWITCH: If this switch is turned on, HSUPA UEs can be configured with a 2 ms TTI only when uplink coverage is strong. When uplink coverage becomes weak, these UEs are configured with a 10 ms TTI. This prevents the call drop rate and access success rate specific to these UEs from decreasing. When this switch is turned off, these UEs can be configured with a 2 ms TTI even though uplink coverage is weak. This affects the call drop rate and access success rate specific to these UEs. 6. DRA_F2U_SWITCH: Turning on this switch reduces the number of cell reselections and relieves FACH congestion.

9) MAP_CSPS_TTI_2MS_LIMIT_SWITCH: Whether CS and PS combined services can use HSUPA 2ms transmission time interval (TTI). When this switch is turned on, CS and PS combined services cannot use HSUPA 2ms TTI, which reduces CS call drops caused by TTI switching. When this switch is turned off, CS and PS combined services can use HSUPA 2ms TTI.

EcN0ThsFor2msTo10ms

Ec/N0 Threshold For BE 10ms TTI Estab

Meaning: Ec/N0 threshold for allocating a 10 ms TTI to HSUPA UEs processing BE services over uplink DPDCHs. When conditions for allocating a 2 ms TTI to an HSUPA UE processing BE services over an uplink DPDCH have been met, the RNC allocates the UE a 10 ms TTI if the Ec/N0 reported by the UE to the RNC is equal to or lower than this threshold. If RESERVED_SWITCH_0_BIT5 in ReservedSwitch0 of the SET UCORRMALGOSWITCH command is turned on, the algorithm controlled by this switch starts operating earlier than the coverage-based initial TTI selection algorithm specific to BE services.GUI Value Range: 0~49Unit: 0.5dBActual Value Range: -24.5~0MML Default Value: NoneRecommended Value: 37Parameter Relationship: The value of this parameter must be larger than the value of ReservedU32Para0 in the SET UCORRMALGOSWITCH command.Service Interrupted After Modification : No (And no impact on the UE in idle mode)Impact on Network Performance: If this parameter is set to a large value, HSUPA UEs can be configured with a 2 ms TTI only when signal quality is high and most UEs are configured with a 10 ms TTI. If this parameter is set to a small value, HSUPA UEs are more likely to be configured with a 2 ms TTI. However, the call drop rate and access success rate for HSUPA UEs are affected when signal quality is poor.

Set Parameters Related to HSUPA TTI Dynamic Adjustment(SET UEDCHTTIRECFG)

Function

Use this command to set the parameters for HSUPA TTI dynamic adjustment algorithm.Note

The value of RatioFor10msTo2ms can take effect only when the following condition is met:

((RatioFor10msTo2ms / 100) x BeHsupa2msTtiRateThs(SET UFRC)) > (E2DThrou4BThd(SET UDCCC) x 10 x 1000).Parameters

Parameter ID Parameter Name

Parameter Description

LowRatioFor2msTo10ms Lower rate ratio thd of TTI 2ms To 10ms

Meaning: Lower rate threshold for TTI from 2ms to 10ms can be calculated by multiplying this parameter by "Rate threshold of BE on 2ms TTI of HSUPA".GUI Value Range: 0~100Unit: %Actual Value Range: 0~1MML Default Value: NoneRecommended Value: 0Parameter Relationship: This parameter must be smaller than UpRatioFor2msTo10msBaseRtwp; This parameter must be smaller than UpRatioFor2msTo10msBaseCE.Service Interrupted After Modification : No (And no impact on the UE in idle mode)Impact on Network Performance: None

UpRatioFor2msTo10msBaseRtwp

Upper rate ratio thd of TTI 2ms To 10ms for RTWP/Cover

Meaning: Upper rate threshold for RTWP/Coverage-based TTI from 2ms to 10ms can be calculated by multiplying this parameter by "Rate threshold of BE on 2ms TTI of HSUPA".GUI Value Range: 0~100Unit: %Actual Value Range: 0~1MML Default Value: NoneRecommended Value: 28Parameter Relationship: This parameter must be greater than LowRatioFor2msTo10ms; This parameter must be smaller than RatioFor10msTo2ms;Service Interrupted After Modification : No (And no impact on the UE in idle mode)Impact on Network Performance: None

UpRatioFor2msTo10msBaseCE Upper rate ratio thd of TTI 2ms To 10ms

Meaning: Upper rate threshold for CE-based TTI from 2ms to 10ms can be calculated by multiplying this parameter by "Rate threshold of BE on 2ms TTI

Parameter ID Parameter Name

Parameter Description

for CE of HSUPA".GUI Value Range: 0~100Unit: %Actual Value Range: 0~1MML Default Value: NoneRecommended Value: 56Parameter Relationship: This parameter must be greater than LowRatioFor2msTo10ms; This parameter must be smaller than RatioFor10msTo2ms;Service Interrupted After Modification : No (And no impact on the UE in idle mode)Impact on Network Performance: None

RatioFor10msTo2ms Rate ratio thd of TTI 10ms To 2ms

Meaning: Rate threshold for TTI from 10ms to 2ms can be calculated by multiplying this parameter by "Rate threshold of BE on 2ms TTI of HSUPA". If the throughput of MAC-D is greater than that threshold, the TTI for the EDCH service may be changed from 10ms to 2ms.GUI Value Range: 0~100Unit: %Actual Value Range: 0~1MML Default Value: NoneRecommended Value: 83Parameter Relationship: This parameter must be greater than UpRatioFor2msTo10msBaseRtwp; This parameter must be greater than UpRatioFor2msTo10msBaseCE;Service Interrupted After Modification : No (And no impact on the UE in idle mode)Impact on Network Performance: None

TtiEdchThrouMeasPeriod E-DCH Throu Meas Period Based TTI

Meaning: Period of E-DCH throughput ratio measurement. This parameter specifies the period of E-DCH throughput ratio measurement.GUI Value Range: 1~10000Unit: 10msActual Value Range: 10~100000MML Default Value: NoneRecommended Value: 60Parameter Relationship: NoneService Interrupted After Modification : No (And no impact on the UE in idle mode)Impact on Network Performance: If this parameter

Parameter ID Parameter Name

Parameter Description

is set to a very large value, the throughput measurement interval involved in the TTI handover algorithm is very long and as a result TTI handovers cannot be triggered in time. In such a case, gains brought by this algorithm are not as many as expected. If this parameter is set to a very small value, the throughput measurement interval involved in the TTI handover algorithm is very short. As a result, TTI handovers are frequently triggered due to inaccurate throughput measurement results. Then, the increased number of Uu signaling messages is likely to increase the call drop rate and frequent TTI handovers are likely to reduce performance gains brought by the TTI handover algorithm.

ResourceOption Resource Option

Meaning: Resource type that triggers TTI adjustment based on user fairness and differentiated services.GUI Value Range: RTWP, IUB, CEUnit: NoneActual Value Range: RTWP, Iub, CEMML Default Value: NoneRecommended Value: RTWPParameter Relationship: NoneService Interrupted After Modification : No (And no impact on the UE in idle mode)Impact on Network Performance: None

Example

Set [Highest User Priority Guarantee Option] parameter as Gold.SET UEDCHTTIRECFG: PriorityOpt=Gold;

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