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Thread: LTE Parameter Optimization Proposal for Festival Event Sites

  1. #1
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    LTE Parameter Optimization Proposal for Festival Event Sites

    Hello,

    Here I have listed some parameters for H// LTE which can be changed on case of festival event sites.

    1) SRI Adaptive Switch
    Activate SRI Adaptive Switch : MOD GLOBALPROCSWITCH: SriAdaptiveSwitch=ON


    • If this parameter is set to ON, the eNodeB adjusts the SRI period based on the SRI algorithm so that the number of admitted UEs can reach the cell capacity.
    • If this parameter is set to OFF, the maximum number of admitted UEs depends on the user-defined SRI period.


    2) PUCCH resource adjustment switch
    Activate PUCCH resource automatic adjustment Switch : PucchAlgoSwitch=PucchSwitch-1


    • If this switch is turned on, PUCCH resource adjustment achieves better utilization of PUCCH resources and reduces uplink control signaling overhead. When the PUCCH resources decrease, however, CQI resources may need to be reconfigured for a few UEs. The reconfiguration consumes certain downlink resources.
    • If this switch is turned off, uplink control signaling overhead increases.


    3) CQI adjustment switch
    Activate CQI adjustment step vary switch : MOD CELLALGOSWITCH:CQIADJALGOSWITCH=StepVarySwitch-1;


    • If this switch is turned on, the IBLER convergence rate can be adjusted based on site scenarios, increasing the downlink rate based on scenarios.
    • If this switch is turned off, the IBLER convergence rate cannot be adjusted, decreasing the downlink rate based on scenarios.


    4 ) Activate SRS
    Activate SRS : MOD SRSCFG: SrsCfgInd=ON;


    • If this parameter is set to BOOLEAN_TRUE, SRS is supported, and higher performance gains are obtained in features depending on SRS measurements, such as beamforming (BF) and uplink frequency selection. However, the cell peak rate in the uplink decreases due to SRS overheads.
    • If this parameter is set to BOOLEAN_FALSE, no SRS resource is available in the cell, and no UE is configured with SRS resources, and therefore the optimum cell peak rate in the uplink can be obtained. However, lower performance gains are obtained in features depending on SRS measurements.


    5) Activate SRS Adaptive Period
    Activate SRS adaptive period :MOD SRSADAPTIVECFG: SrsPeriodAdaptive=ON



    • If this parameter is set to ON, the eNodeB adaptively adjusts the SRS period for UEs that will access the cells under the eNodeB. The adjustment is based on the load of SRS resources and achieves a tradeoff between the number of UEs served and network performance.
    • If this parameter is set to OFF, the eNodeB uses a fixed SRS period for UEs that will access the cells under the eNodeB.



    6) Set Adaptive RBG Allocation Strategy
    Set Adaptive RBG Allocation Strategy : MOD CELLDLSCHALGO: LocalCellId=x, RbgAllocStrategy=ADAPTIVE



    • If this parameter is set to ROUND_DOWN, all allocated RBs are fully utilized, spectral efficiency is high, but cell throughput is relatively low.
    • If this parameter is set to ROUND_UP, a few allocated RBs are not utilized, spectral efficiency is low, but cell throughput is relatively high. Compared with setting this parameter to ROUND_UP, setting this parameter to ADAPTIVE does not waste RBs when the number of required RBGs is less than 1.


    7) Set Adaptive Enhanced CFI
    Set Adaptive Enhanced CFI : MOD CELLPDCCHALGO:PdcchSymNumSwitch=ECfiAdaptionON;

    • If this parameter is set to OFF, the number of OFDM symbols occupied by the PDCCH is fixed and cannot be dynamically adjusted.
    • If this parameter is set to ON, the number of OFDM symbols occupied by the PDCCH is dynamically adjusted based on the number of required CCEs, and therefore cell downlink throughput increases.
    • If this parameter is set to ECFIADAPTIONON, the dynamic adjustment of the number of OFDM symbols occupied by the PDCCH considers cell downlink throughput, and therefore can reach higher throughput when downlink frequency selective scheduling is enabled.


    8) Set Adaptive RBG Allocation Strategy
    Set Adaptive RBG Allocation Strategy : MOD CELLDLSCHALGO: LocalCellId=x, RbgAllocStrategy=ADAPTIVE



    • If this parameter is set to ROUND_DOWN, all allocated RBs are fully utilized, spectral efficiency is high, but cell throughput is relatively low.
    • If this parameter is set to ROUND_UP, a few allocated RBs are not utilized, spectral efficiency is low, but cell throughput is relatively high. Compared with setting this parameter to ROUND_UP,setting this parameter to ADAPTIVE does not waste RBs when the number of required RBGs is less than 1.



    9) Set Adaptive Enhanced CFI
    Set Adaptive Enhanced CFI :MOD CELLPDCCHALGO:PdcchSymNumSwitch=ECfiAdaptionON

    • If this parameter is set to OFF, the number of OFDM symbols occupied by the PDCCH is fixed and cannot be dynamically adjusted.
    • If this parameter is set to ON, the number of OFDM symbols occupied by the PDCCH is dynamically adjusted based on the number of required CCEs, and therefore cell downlink throughput increases.
    • If this parameter is set to ECFIADAPTIONON, the dynamic adjustment of the number of OFDM symbols occupied by the PDCCH considers cell downlink throughput, and therefore can reach higher throughput when downlink frequency selective scheduling is enabled.



    10) Activate PDCCH Capacity improvement Switch
    Activate PDCCH Capacity improvement switch : MOD CELLPDCCHALGO: LocalCellId=0, PdcchCapacityImproveSwitch=ON;
    Setting this parameter to ON offers the following benefits:



    • PDCCH capacity is expanded, and therefore cell throughput increases;
    • the uplink CCE allocation success rate increases, and therefore the access success rate increases and service drop rate decreases;
    • the CCE allocation success rate increases, and therefore cell throughput increases.


    11) UL Interference Randomization
    Set Adaptive Interference Randomization : MOD CELLULSCHALGO: LocalCellId=x, UlRbAllocationStrategy=FS_INRANDOM_ADAPTIVE;



    • If this parameter is set to FS_INRANDOM_ADAPTIVE, inter-cell interference decreases. Both throughput of cell edge users (CEUs) and the total cell throughput increase when the cell is lightly loaded, and throughput of CEUs increases but the total cell throughput may decrease
    • When the cell is heavily loaded. Setting this parameter to the default value FS_NONFS_ADAPTIVE has no impact on network performance



    12) Activate DMRS Scheduling for Uplink timing
    Activate the mechanism of optimized demodulation reference signal (DMRS) scheduling for uplink timing : MOD TATIMER: LocalCellId=0, TimingResOptSwitch=ON



    • If this parameter is set to OFF, more DMRS resources are consumed for uplink timing when sounding reference signal (SRS) resources are not configured for UEs in heavily loaded cells where there is a large number of UEs. As a result, the access success rate and uplink and downlink throughput decrease, and the service drop rate increases.
    • If this parameter is set to ON, DMRS resources used for uplink timing decrease. As a result, the access success rate and the uplink and downlink throughput do not decrease, and the service drop rate does not increase in heavily loaded cells where there is a large number of UEs. However, the uplink and downlink throughput of UEs that move faster than 120 km/h decreases because of delayed uplink timing.



    13) Deactivate UL Pre-allocation
    Deactivate UL Pre-allocation : MOD CELLALGOSWITCH: LocalCellId=0, UlSchSwitch=PreAllocationSwitch-0;



    • if preallocation is enabled, the delay of uplink data transmisstion is shortened, but the uplink interference and UE power comsumption are increased.
    • if preallocation is disabled, the delay of uplink data transmission is increased, but the uplink interference and UE power consumption are decreased.



    14) Activate Special Signaling Re-transmission
    Enable Special Signaling Re-transmission : MOD ENODEBALGOSWITCH: HighLoadNetOptSwitch=SPECSIGRETRANSOPTSWITCH-1;




    15) PDCCH & PDSCH Downlink Scheduling Balance


    • If this switch is on and the number of UEs in the cell is large, the number of retransmitted inter-RAT handover commands and the RRC Connection Release messages decreases, and less air interface resources are consumed.
    • If this switch is off, some UEs may not reply to HARQs/ARQs of inter-RAT handover commands, which causes the eNodeB to retransmit inter-RAT handover commands repeatedly. In addition, some UEs may not send ACK to the eNodeB in response to the RRC Connection Release messages, which causes the eNodeB to retransmit the RRC Connection Release messages repeatedly. When one of the preceding conditions is met, uplink and downlink throughput in the cell may decrease.


    16) DataThdInPdcchPdschBal :
    DL Scheduling : MOD CELLDLSCHALGO: LocalCellId=0, DataThdInPdcchPdschBal= 17000, UeNumThdInPdcchPdschBal=100;



    • Setting this parameter to 0 has no impact on network performance.
    • Setting this parameter to a non-zero value increases the physical resource block (PRB) usage in the PDSCH and downlink throughput in large traffic volume scenarios.
    • A smaller value of this parameter results in a higher probability of a bearer being determined as a bearer with large packets.
    • A larger value of this parameter results in a lower probability of a bearer being determined as a bearer with large packets.



    17) UeNumThdInPdcchPdschBal :

    • If the number of synchronized UEs in the cell is less than this parameter value, the network performance is not affected.
    • If the number of synchronized UEs in the cell is greater than or equal to this parameter value, PDCCH and PDSCH resources are balanced, increasing PRB usage in the PDSCH and downlink throughput in large traffic volume scenarios.



    Please share this with your friends and comment if you would like to add some more parameters.

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  2. #2
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    Can u please share similar parameter for E/// system




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