why feedback_channel_delay = 1，it should be 4 in FDD

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  • 17. February 2017 at 8:42 #7514
    WangHongchao
    Participant

    Dear all

    I have a question about the feedback_channel_delay parameter.

    Uplink channel options
    • LTE_config.feedback_channel_delay: uplink delay in TTIs. When set to 0 TTIs, only the CQI reports experience zero delay. ACK reports have a minimum delay of one TTI

    in LTE-A-DL-System-Level-Simulator-Rel-v1-9-Q2-2016\sim_main_launcher_files\LTE_sim_main_launcher_demo_RRH.m
    LTE_config.feedback_channel_delay= 1; % In TTIs
    this feedback set to 1, I think it should be 4， when ue received downlink data it will last 4 tti to feedback ACK to eNB.
    I don’t know, my understand is right？

    13. March 2017 at 11:41 #7729
    Fjolla Ademaj
    Member

    Dear Wang

    The value of the LTE_config.feedback_channel_delay is a desired paramter. Based on the 3GPP standard it is recommended a value of 3 or 4. You can addapt this value in your simulations accordingly.

    Best regards,
    Fjolla

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