MAC throughput and Delay in LTE

[Shashi Ranjan]

HI everyone,

I need to find the MAC throughput in LTE network. I know it generates Rlc and Pdcp trace files containing information about packets but for MAC throughput, it cannot be used. MAC trace file consists of frame    sframe    RNTI    mcsTb1    sizeTb1    mcsTb2    sizeTb2. I want to know how can these information can be used to get throughput. I came across link http://jaekuryu.blogspot.se/2010/01/tips-for-lte-protocol.html which demonstrates throughput calculation but I am not sure about it. Moreover, how can I calculate the delay stats for MAC layer ?

Please reply soon.

[Marco Miozzo]

Hi Shashi,

formally RLC is part of the MAC layer, so you in case you need per flow statistics, it would work (e.g., refer to most of the scheduler tests as en example).

However, in case the latter is not your case, you should specify more in detail what you need. Consider that RLC and MAC traces already include mostly all the information processed by the MAC (=Scheduler + Rlc), so maybe is would be just a matter of combine them.

Best regards,
marco.

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[Shashi Ranjan]

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[Shashi Ranjan]

Hi marco,

Thanks for replying. I understood that RLC stats can be used for MAC layer. But I have a doubt. In lte-test-rr-ff-mac-schedular, for downlink case when MCS =28, it means I_TBS = 26 . For PRB = 24, TB is taken as 2196 But from table 7.1.7.2.1-1 of 36.213 TB is 17568. Can you tell me how ns3 is calculating TB size?

Thanks,

Shashi

On Mon, Sep 2, 2013 at 1:36 PM, Marco Miozzo <marco....@gmail.com> wrote:

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[Marco Miozzo]

FF-APIs used by Schedulers use bytes, while 3GPP uses bit: 17568/8=2196.

marco.

[Shashi Ranjan]

Hi marco,

Thank you very much for these discussions.