Improving Channel Quality Indicator (CQI) parameters is crucial for enhancing the performance of LTE networks. Huawei, being a major telecom equipment provider, offers various methods and technologies to optimize CQI reporting and utilization.
CQI Parameter Improvement.
1. Frequency selector switch:
This switch controls whether to enable the frequency selective scheduling function. This switch enables users to transmit data on the frequency band with good channel quality. This parameter only applies to FDD and TDD.
MOD CELLALGOSWITCH LOCALCELLID=X,DLSCHSWITCH=FreqSelSwitch-1;2. PUCCH power control DTX SINR optimization processing switch:
When the switch is off, when the PUCCH power control detects DTX, the eNB does not process the SINR measured in the DTX state; when the switch is on, when the PUCCH power control detects DTX, the eNB still processes the measured SINR, and generates a successful control command word and sends it to UE. This parameter only applies to FDD and TDD.
MOD CELLALGOSWITCH LOCALCELLID=X,ULPCALGOSWITCH=PucchPcDtxSinrSwitch-1;3. CQI Period Adaptive Switch:
This parameter represents the CQI cycle adaptive switch. If set to ON, the CQI period is configured adaptively according to the air interface load of the cell; if it is set to OFF, the CQI period is configured by UserCqiPeriod. This parameter only applies to FDD and TDD.
When the CQI cycle adaptive switch is turned off, a fixed configuration is used. This parameter indicates the CQI cycle in the fixed configuration, and only takes effect when the CQI cycle adaptive switch is turned off. When the UserCqiPeriod configuration value is 2ms, for TDD cells, the value of the cell automatic modification is 5ms. This parameter only applies to FDD and TDD.
MOD CELLCQIADAPTIVECFG
LOCALCELLID=X,CQIPERIODADAPTIVE=OFF,USERCQIPERIOD=ms160;4. Toggle aperiodic CQI configuration switch:
This parameter controls the aperiodic CQI resource configuration and aperiodic CQI reporting trigger of the handover user. This parameter is set to ON, and aperiodic CQI resources are configured in the handover command. For users without periodic CQI configuration, an aperiodic CQI report is triggered when there is downlink service after handover is completed;
this parameter is set to OFF, and no non-periodic CQI is configured in the handover command Periodic CQI resources, and aperiodic CQI configuration is performed after the handover is completed. This parameter only applies to FDD and TDD.
MOD CELLCQIADAPTIVECFG OCALCELLID=X,HOAPERIODICCQICFGSWITCH=ON;5. CQI optimization algorithm switch:
This parameter is used to control whether the CQI optimization algorithm on PUCCH and PUSCH is enabled. PUSCH CQI false detection algorithm switch: This parameter is used to control whether the associated CQI false detection algorithm on PUSCH is enabled. When the switch is turned on, it means that the optimization algorithm of PUSCH associated CQI false detection is turned on, which can effectively reduce the probability of CQI false detection (the UE does not send CQI, but the eNodeB detects CQI); when the switch is turned off, it means that the PUSCH associated CQI false detection is turned off optimization.
This parameter only applies to FDD and TDD. PUCCH CQI false detection algorithm switch: This parameter is used to control whether the PUCCH CQI false detection algorithm is enabled. When the switch is turned on, it indicates that the PUCCH CQI false detection algorithm switch is turned on; when the switch is turned off , it indicates that the PUCCH CQI false detection algorithm switch is turned off. This parameter only applies to FDD and TDD.
MOD CELLCQIADJALGO LOCALCELLID=X, CQIOPTSWITCH=PUSCH_CQI_FALSE_DETECTION_SW1;
MOD CELLCQIADJALGO:LOCALCELLID=X, CQIOPTSWITCH=PUCCH_CQI_FALSE_DETECTION_SW-1;6. Normalized PDSCH power offset:
Impact on wireless network performance: The larger the parameter setting is, the higher the single-codeword or double-codeword CQI reporting value of some terminals will be, and the greater the Rank2 ratio will be; the smaller this parameter setting is, the higher the singlecodeword or double-codeword CQI reporting value will be.
Smaller, the lower the Rank2 ratio (if the single and double codewords are not counted for CQI, the CQI statistical result may not change due to the change of the Rank ratio) . When this parameter is modified to a non- zero value, the reported value of CQI/Rank may be inconsistent with the downlink channel quality, and downlink MCS and bit errors may change, affecting downlink user perception rate and cell throughput.
When the “User Signaling MCS Enhancement Switch” is turned off, when this parameter is modified to a non-zero value, the call drop rate, access success rate, and handover success rate are not affected. “User signaling MCS enhancement switch” is enabled. When the actual value of this parameter is greater than 0, it may have a negative impact on the signaling plane KPI.
MOD CELLLDLPCPDSCHPA: LocalCellId=X, NomPdschRsEpreOffset=3;7. Pucch power control cycle:
The smaller this parameter is set, the faster the PUCCH power adjustment, but the higher the probability of ping-pong adjustment; the larger the parameter is set, the slower the PUCCH power adjustment, but the lower the probability of ping-pong adjustment.
MOD CELLPCALGO:LOCALCELLID=X,PUCCHPCPERIOD=1;8. Pucch power control target SINR bias:
The smaller this parameter is set, the smaller the PUCCH power of users in this cell is, and
the smaller the PUCCH interference to other users in this cell and the users in neighboring
cells; The greater the PUCCH interference with neighboring cell users.
MOD CELLPCALGO:LOCALCELLID=X,PUCCHPCTARGETSINROFFSET=10;9. Dynamic adjustment switch for the number of OFDM symbols occupied by PDCCH:
This parameter indicates the dynamic adjustment switch of the number of OFDM symbols occupied by the PDCCH. If it is set to OFF, it means that the symbol adaptation is off, and the number of available symbols for the PDCCH of the system is fixed.
Number of symbols” MML help; set to ECFIADAPTIONON means enhanced symbol adaptation is on, the system optimally adjusts the number of PDCCH symbols based on the downlink throughput rate, and the dynamic adjustment range of the number of symbols refers to the parameter “PDCCH initial OFDM symbol number” MML help.When the sub-switch EMTC_SWITCH of the EmtcAlgoSwitch parameter in CellEmtcAlgo is turned on and the value of the startSymbolBR-r13 cell changes due to the modification of this parameter, the eMTC users that have been connected in the cell will be actively released. This parameter only applies to FDD and TDD.
MOD CELLPDCCHALGO:LOCALCELLID=X,PDCCHSYMNUMSWITCH=ECFIADAPTIONON;10. PUCCH nominal P0 value:
If P0NominalPUCCH is set too high, it will increase the interference of neighboring cells and reduce the throughput of the entire network; if P0NominalPUCCH is set too low, it will reduce the interference to neighboring cells, but it will reduce the throughput of this cell.
MOD CELLULPCCOMM:LOCALCELLID=X, P0NOMINALPUCCH=-115;11. DRX Feature Switch:
When the switch is turned on, the UE is triggered to enter the DRX state, the UE will save more power, and the network performance impact is limited by the DRX parameter configuration. This parameter does not take effect when dynamic DRX (only applicable to
LTE) is enabled.
MOD DRX RXALGSWITCH=OFF;12. CQI Reliability Optimized Switch:
CQI reliability optimization switch: When the switch is on, more falsely detected CQIs can be identified in interference scenarios and filled with historical CQI values; when the switch is off, the falsely detected CQIs will not be identified. This parameter only applies to FDD and TDD.
CQI false detection optimization switch in DRX: when the switch is turned on, the CQI value detected during the operation of the DrxInactivityTimer triggered by SR false alarms is not counted in the performance indicators; when the switch is turned off, the CQI values detected during the operation of the DrxInactivityTimer triggered by SR false alarms Values are also counted in performance metrics.
MOD CELLALGOSWITCH:LOCALCELLID=X, DETECTIONALGOSWITCH=CqiReliableSwitch-1;13. MIMO transmission mode adaptive switch:
NO_ADAPTIVE (fixed configuration), OL_ADAPTIVE (open loop adaptive), CL_ADAPTIVE (closed loop adaptive), OC_ADAPTIVE (open and closed loop adaptive). There are four options for the MIMO mode adaptation type parameter in the multi-antenna eNodeB, including:
Fixed configuration mode: Configure the MIMO mode according to the fixed MIMO mode selection parameters, but will not trigger switching between MIMO modes. Open loop adaptive mode: The terminal only reports RANK and CQI, but does not report PMI.
Closed-loop adaptive mode: In addition to RANK and CQI, the terminal also needs to report PMI. Open and closed loop adaptation mode: Configure the terminal to switch between open loop adaptation and closed loop adaptation. This parameter only applies to FDD and TDD.
MOD CELLMIMOPARACFG: LOCALCELLID=2, MimoAdaptiveSwitch=CL_ADAPTIVE;