RTWP Optimization RoadmapRTWP OptimizationOptimization SolutionSupported VersionImpact RangeSolutions Available in Different VersionsImplementationRemarksR10R11R12R13Optimization of CQI feedback periodAllRNC/CellThis is directly implemented by on-site engineers.This is a standard solution and should be implemented preferentially.Access parameter optimization (indoor distribution)AllCell10 ms fixed PO optimizationAllRNCInternal parameters are involved in versions earlier than R13.The link release problem of IPhone 4R12RNCThe solution is merged into RNC R12SPC516.State transition/EFDR12RNCThis affects KPIs.EFD is implemented on a network with a high iPhone penetration rate.2 ms fixed PO optimizationR10RNCThis needs to be analyzed by R&D engineers.Internal parameters are involved.Value optimization of SIB 7 broadcast RTWPR12CellThis is merged into NodeB R12SPC430.HSUPA PO adaptive adjustmentR13RNCThis is used for 10 ms, and not used with the fixed PO optimization at the same time.HSUPA TTI selection and switchover solution enabled + 2 ms periodic retry disabled.R10RNCHSUPA TTI selection and switchover solution includes the TTI switchover realized on R10 and based on load, the TTI switchover realized on R12 and based on admission CE, and the access state TII selection realized on patch release R3 (RNC R13SPH529).Reception using multiple antennasAllCell0.5/0.5 reconstructionAllCellMultiple-RRU demodulationR13NodeBHSUPA target retransmission times changed to 10%.AllRNCThis is a non-standard solution. It is recommended that on-site engineers select a site to try first.PS R99 target BLER changed to 10%AllRNCDisable the HSUPA 2 ms function.R10RNC/NodeBLimit the maximum number of HSUPA users in the cell.AllCell

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Optimization Solution SummaryNo.ClassParameterSupported VersionControlled by a License or NotImpact RangeBaseline ConfigurationAfter OptimizationInternal ParameterInvolved or NotDescriptionEffectCommand1Feature algorithmHSUPA PO adaptive reconfiguration enabledR13YesRNCOFFONNoIf the subscriber rate is lower than a certain threshold, and the air interface load is limited, increase the HSUPA reference PO to reduce the SIR working point of lower rate subscribers, and to improve uplink capacity.Gain: When the subscriber amount is large and the rate is low, the gain of this feature is obvious. For example, more than fifteen 10 ms subscribers that only have small amounts of data to be retransmitted are online and uploading at the same time. If the power offset of data channels for these subscribers all can be adjusted, the HSUPA capacity of the cell can improve by more than 40% without object load increase, which is shown by the increase of the average throughput or the increase of uplink data transmission subscriber number at the same time.Risk: Four minutes are taken from triggering to completion of this feature. The gain is not obvious for frequently link-deleting/link-establishing subscribers or subscribers with too short lasting time links.This is used for 10 ms, and not used with the fixed PO optimization at the same time.MML Command on RNC:SET UCORRMALGOSWITCH: PcSwitch=PC_HSUPA_DATA_CH_PO_ADAPTIVE_ADJ_SWITCH-1;If need to rollback:SET UCORRMALGOSWITCH: PcSwitch=PC_HSUPA_DATA_CH_PO_ADAPTIVE_ADJ_SWITCH-0;210 ms fixed PO optimizationAllNoRNC//YesConfigure higher reference PO for 10 ms TTI to reduce DPCCH SIR working point, and reduce the uplink cost of the control channel. Therefore, the throughput of the HSUPA cell with multiple subscribers is improved.Gain: For the lab test with dual antennas, 75% uplink load target threshold, 18 online subscribers and two uploading subscribers, the gain of the uplink throughput in the cell is 15%.Risk: The peak rate of the HSUPA 10 ms subscriber in commercial network competition is slightly affected.Versions earlier than R13 refer to internal parameter modification. You need to obtain the commands for modifying internal parameters from the PDT manager of the product line. It is recommended that HSUPA PO adaptive adjustment is used on R13 version and later versions.32 ms fixed PO optimizationAllNoRNC//YesConfigure higher reference PO for 10 ms TTI to reduce DPCCH SIR working point, and reduce the uplink cost of the control channel. Therefore, the throughput of the HSUPA cell with multiple subscribers is improved.Gain: For the lab test with dual antennas, 90% uplink load target threshold, 7 online subscribers and two uploading subscribers, the gain of the uplink throughput in the cell is 15%.Risk: The peak rate of the HSUPA 2 ms subscriber in commercial network competition is greatly affected.If internal parameters are involved, you need to obtain the commands for modifying internal parameters from the PDT manager of the product line.4HSUPA TTI selection and switchover solution enabled + 2 ms periodic retry disabled.TTI switchover based on loadR10NoRNCThis is related to the configuration on the live network.TTI switchover: ON2 ms periodic retry: OFFNoIf the air interface load exceeds the target node, and 2 ms TTI is configured for the service. the rate cannot reduce because the scheduling algorithm guarantees one RLC PDU. The related minimum rate is 168 kbit/s (336) or 328 kbit/s (656). At this time if the TTI is switched from 2 ms to 10 ms, the actual subscriber rate is reduced, and also the cell load. The RTWP overshoot caused by data burst because of high minimum rate of 2 ms subscribers is reduced. The 2 ms periodic retry is disabled to prevent TTI ping-pong switchover.Gain: This reduces load when the uplink load resource is severely limited, and reduces the RTWP.Risk: the peak rate is affected after the subscriber switches to 10 ms.TTI switchover: ONSET UCORRMALGOSWITCH: DraSwitch=DRA_BASE_RES_BE_TTI_RECFG_SWITCH-1;2ms retry period OFF: SET UFRC: RETRYCAPABILITY=SRB_OVER_HSDPA-1&SRB_OVER_HSUPA-1&TTI_2MS-0&MIMO-1&64QAM-1&L2_ENHANCE-1&DTX_DRX-1&HSSCCH_LESS_OPERATION-1,TTI switchover based on admissionR12NoRNCThis is related to the configuration on the live network.TTI switchover: ON2 ms periodic retry: OFFNoIn admission, the consumed admission CE of the 2 ms subscriber is more than that of the 10 ms subscriber. Therefore, when the admission CE is limited, switching the subscriber from 2 ms to 10 ms improves the admission subscriber number of the system. The RTWP overshoot caused by data burst because of high minimum rate of 2 ms subscribers is reduced. The 2 ms periodic retry is disabled to prevent TTI ping-pong switchover.Gain: This alleviates the admission CE congestion problem after 2 ms TTI is enabled, and improves the subscriber number specification.Risk: the peak rate is affected after the subscriber switches to 10 ms.TTI switchover: ONSET UCORRMALGOSWITCH: DraSwitch=DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH-1;2ms retry period OFF: SET UFRC: RETRYCAPABILITY=SRB_OVER_HSDPA-1&SRB_OVER_HSUPA-1&TTI_2MS-0&MIMO-1&64QAM-1&L2_ENHANCE-1&DTX_DRX-1&HSSCCH_LESS_OPERATION-1,TTI selection of access stateRNC RAN13SPH529NoRNCThis is related to the configuration on the live network.TTI switchover: ON2 ms periodic retry: OFFNoThe HSUPA subscriber selects the initial TTI based on the actual resource (RTWP/Iub/CE) congestion state. This prevents that in the network with a large amount of subscribers, subscribers access with 2 ms TTI all the time. Therefore, The RTWP overshoot caused by data burst because of high minimum rate of 2 ms subscribers reduces.Gain: The initial TTI is selected based on the resource congestion state when the subscriber accesses. This reduces reconfiguration signaling and improves power efficiency.Risk: in the network with a few subscriber access and high speed uplink transmission, the subscriber peak rate is affected.TTI switchover: ONSET UCORRMPARA: ReservedSwitch0=RESERVED_SWITCH_0_BIT2-1; (R13 uses the reserved switch)5SolutionCQI feedback periodAllNoRNC/Cell28YesThe shorter the CQI feedback period is, the better the downlink data transmission is. The longer the CQI feedback period is, the lower the load occupation is.Gain: On the office in country A, the CQI feedback period is changed from 2 ms to 8 ms. After optimization, the average value of the realtime traced RTWP is reduced by about 8 dB. The average RTWP value of hour-level traffic statistics is reduced by about 10 dB.

Risk: theoretically, this brings loss of downlink throughput. After this solution is implemented on office A and B, In the whole network view, no negative affections occur.If internal parameters are involved, you need to obtain the commands for modifying internal parameters from the PDT manager of the product line.6EFD is recommended for the networks with high ratio of state transition switch/iPhone.R12NoRNCOFFONNoTransit the light-traffic subscribers to the FACH state, reduce dedicated channel resources occupation of light-traffic subscribers, and reduce uplink and downlink load. EFD is used for networks with high iPhone penetration rates.Gain: The gain is related to traffic models and the permanent online timer.Risk: This increases PS call drop rate, and decreases the setup success rate of CS composite services. Because the EFD is not compatible with other terminals, currently only iPhone is recommended to be used.MML Command on RNC:SET UCORRMALGOSWITCH: DraSwitch=DRA_HSDPA_STATE_TRANS_SWITCH-1&DRA_HSUPA_STATE_TRANS_SWITCH-1&DRA_PS_BE_STATE_TRANS_SWITCH-1;7Reception using multiple antennasAllNoCellThis is related to the configuration on the live network.This is related to the configuration on the live network.NoFor the same transmission rate, the reception using multiple antennas reduces the signal power that each antenna receives, that is, the uplink load. For the same load, the reception using multiple antennas allows the UE to send larger transmission blocks, which means the uplink capacity is improved.Gain: Compared with reception using one antenna, reception using two antennas improves the uplink capacity by more than 50%. Compared with the dual-antenna reception, the four-antenna reception improves the uplink capacity by more than 50%.Risk: No for now.None80.5/0.5 reconstructionAllNoCellThis is related to the configuration on the live network.This is related to the configuration on the live network.NoThe dual-antenna demodulation reception is realized on the baseband side. The baseband side and the RF side do not merge raw data, and the RTWP is the same as that in the regular dual-antenna cell.Gain: In the multi-area cell networking, compared with the distributed cell, the 0.5/0.5 reconstruction does not have noise floor increase.Risk: The stability of some RRUs is affected.9Multiple-RRU demodulationR13NoNodeBThis is related to the configuration on the live network.This is related to the configuration on the live network.NoBasic principle: The NodeB independently demodulates and merges several received RRU signals in the baseband processing module, and duplicates a cell signal branch to several RRUs for transmission.Gain: This improves cell capacity and throughput, and reduces the times of subscriber handover between cells.Risk: More baseband resource consumption.1. Use site configuration (ADD SITE) to configure related site information.2. Use sector configuration (ADD SEC) to select the sector type as MULTIRRU_SECTOR, select uplink RRU number in RRU number, and fill in the related cabinet, frame and slot for the RRU. A new sector type for independent demodulation of multiple RRUs is added.3. Use uplink resource group configuration (ADD ULGROUP) to configure the needed uplink board resource. Note that for the resource group with independent demodulation of multiple RRU, the demodulation mode is configured as dual antennas (DEM_2_CHAN).4. Use downlink resource group configuration (ADD DLGROUP) to configure the needed downlink board resource.5. Use local cell configuration (ADD LOCELL) to select the sector type as MULTIRRU_SECTOR. The RRU mode is configured as UNSYNC (Part of RRUs in the sector are used) or SYNC (all RRUs are in the sector are used) based on needs. Note that 2T cannot be configured for the cell with independent demodulation of multiple RRUs. The cell does not support MIMO, DC+MIMO far cell configuration or desensitization intensity configuration. The maximum cell radius is limited to 30 km, and the default value is 10 km.10HSUPA target retransmission times modification for 10 ms (10%)AllNoRNC1%10%NoModify the 10 ms target retransmission times of HSUPA from 1% to 10%.Non-standard solutionModifying the 10 ms target retry to 10% affects subscriber peak rate. It is recommended that this solution is carried out in the non-competition network or networks that have no requirements for 10 ms peak rate.MML Command on RNC:MOD UTYPRABOLPC: RabIndex=xx, SubflowIndex=xx, TrchType=TRCH_EDCH_10MS, DelayClass=xx, EdchTargetLittleRetransNum=100;11Target BLER modification for PS R99 network (10%)NoRNC1%10%NoModify the BLER of PS subscribers in the R99 network from 1% to 10%.Non-standard solutionIf you modify the high-speed (such as 384 Kbit/s) BLER to 10%, the idle subscriber peak rate is affected. It is recommended that the BLER is modified based on the traffic mode and rate on the live network.MML Command on RNC:MOD UTYPRABOLPC: RabIndex=xx, SubFlowIndex=xx, TrchType=TRCH_DCH, DelayClass=xx, BLERQuality=-10;12Reduce the maximum number of HSUPA subscribers in the cell.NoCellThis is related to the configuration on the live network.This is related to the configuration on the live network.NoReduce the maximum number of HSUPA access subscribers in the cell, and reduce the RTWP cost of HSUPA subscribers.Non-standard solutionReduce the maximum number of HSUPA access subscribers in the cell, and reduce the RTWP cost of HSUPA subscribers. It is recommended that this solution is carried out in the non-competition network.MML Command on RNC:MOD UCELLCAC: CellId=xx, MaxHsupaUserNum=xx;If need to rollback:MOD UCELLCAC: CellId=xx, MaxHsupaUserNum=xx;13Disable the HSUPA 2 ms function.YesRNC/NodeBONOFFNodisabling the HSUPA 2 ms function makes only 10 ms available for HSUPA subscribers.Non-standard solutionDisabling the2 ms function affects subscriber peak rate. It is recommended that the 2 ms function is modified in non-competition network.MML Command on RNC:SET UCORRMALGOSWITCH: MapSwitch=MAP_HSUPA_TTI_2MS_SWITCH-0;Or disable the HSUPA 2 ms License on NodeB side14Access parameter modificationModify the constant value of the initial transmit powerAllNoCell-20-30NoBasic principle: By reducing the spike of the preamble open-loop power control on the uplink RTWP in RACH initial access, the RTWP is significantly reduced in the cell with frequent RACH access (thousands of times per hour).Gain: After the Constantvalue parameter is modified on the office in country C, the RTWP average value is reduced by 3 dB to 4 dB. After PreambleRetransMax, PowerRampStep and Mmax parameters are modified, the average RTWP value is reduced by 1 dB.Risk: For indoor coverage scenarios, the access delay increases.MML Command on RNC:MOD UPRACHUUPARAS: CELLID=xx, PHYCHID=4, CONSTANTVALUE=-30, PREAMBLERETRANSMAX=40, POWERRAMPSTEP=1;

If rollback is needed:MOD UPRACHUUPARAS: CELLID=xx, PHYCHID=4, CONSTANTVALUE=-20, PREAMBLERETRANSMAX=20, POWERRAMPSTEP=2;

MOD URACH: CellId=xx, TrChId=xx, NB01max=10, Mmax=3;Preamble retry timesAllNoCell2040StepAllNoCell21Maximum number of cyclesAllNoCell83Upper limit of random rollbackAllNoCell01015Value optimization of SIB 7 broadcast RTWPNodeB R12 SPC430NoCell-90This is based on the implementation impact on the live network.NoReduce the spike of the preamble open-loop power control on the uplink RTWP in RACH initial access, especially in high load scenarios. The RTWP in SIB7 is broadcast in real time. If you reduce the RTWP in SIB7, the effect is essentially the same as that of reducing the Constvalue. Both are for reducing the UE power of transmitting the first preamble.Gain: After the RTWP value of SIB7 broadcast is optimized on the office in country A, the average RTWP value is reduced by about 3 dB. Risk: In the scenario with low load and not obvious RTWP spike caused by RACH, each RACH access needs a large amount of preamble ramp progress, which causes hundred-ms-level delay to increase.Value optimization of SIB 7 broadcast RTWPMOD CABINET: CN=x, CD="rtwpsw"16Special terminaliPhone4 problemRNC RAN12 SPC516NoRNCOFFONNoWhen iPhone releases the link, the iPhone retransmits the RRC CONN REL CMP signaling message. However, the network side releases the link before UE. As a result, the uplink power control is abnormal and the RTWP spike occurs. Solution: When iPhone releases the link, the network side delays to releasing the link.Gain: The RTWP spike is reduced, especially for networks with high iPhone penetration rates. After the solution is implemented on the site in Thailand, the RTWP average value improves by about 3 dB. Risk: No for now.The solution is merged into RNC RAN12 SPC516 version.

MML Command on RNC:SET URRCTRLSWITCH: PROCESSSWITCH3=UM_RRCRELCMP_RLDEL_DELAY_SWITCH-1;Stands for non-standard solution