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Thread: Modelling LTE downlink capacity

  1. #1
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    Default Modelling LTE downlink capacity

    Hi all,

    I wish to model the LTE resources that impact the downlink capacity of cell in my LTE network, this will be used in a forecasting tool to predict when the average user download speed will be below xMbps.

    Can anyone provide a comprehensive list of KPIs that I should measure as inputs to my model?

    I work as a design engineer (physical configuration) and am not very up to speed on the physical/logical channels that impact DL throughput.

    Any help would be greatly appreciated.

    Thanks,

    Pedro

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  4. #2
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    Default Re: Modelling LTE downlink capacity

    you should talk with planning people. they do this math when they calculate #sites, they take some assumptions about user throughput that influence Transmission network capacity , baseband eNodeB capacity and for certain RF considerations, number of sites.
    many networks suffer more in transmission network than in planning/capacity process

  5. #3
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    1 out of 1 members found this post helpful.

    Default Re: Modelling LTE downlink capacity

    May be below will help.

    Offered DL User Throughput = PRB Load * LTE Cell Capacity / TTI Load

    Where
     LTE Cell Capacity [Mbps] = Number of PDSCH REs/sec*Bits per symbols*MIMO Gain*(1 –
    BLER)

    Assuming:
     MIMO Rank = 1.7 (2x2 MIMO)
     MIMO Rank = 3.1 (4x4 MIMO)
     BLER = 10%
     PRB Load = 85%
     TTI Load = 350% (3.5 users scheduled)
    RF engineer

  6. #4
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    Default Re: Modelling LTE downlink capacity

    you can consider also following kpi for input of your DL throughput model :
    - Inter Site Distance (ISD). ISD less than 500m usually better throughput than more than 2000m
    - Cell Bandwidth. Different DL throughput for 5 MHz, 10 MHz, 15 MHz, 20 MHz.
    - Number of antenna (MIMO 2x2, 4x4, SISO),
    - Number of RRC user
    - PRB Utilization
    - feature activated : such as DL 256QAM, Carrier Aggregation is also impact to throughput model.

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