Different path loss; same value of throughput

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  • #12605
    Hasyimah
    Participant

    Good day,

    I would like to ask why the values of throughput obtained at 43 dBm for UEs in NOMA scenario are the same even different values of path loss were configured for each UEs as the following:

    UE1 = 80 dB
    UE2 = 90 dB
    UE3 = 110 dB
    UE4 = 115 dB

    The values of throughput obtained:

    UE1 & UE2 = 5 Mbps
    UE3 & UE4 = 1.1 Mbps

    UE1 is paired with UE4 whereas UE2 is paired with UE3. 72 subcarriers involved in the NOMA cell where UE1 & UE2 are allocated with 36 subcarriers respectively.

    Thank you..

    #12656
    Bashar Tahir
    Participant

    Dear Hasyimah,

    This is because 43 dBm is already a high transmit power so that each user already reached its maximum throughput, which is dependent on the allocated subcarriers per user.

    To see the difference, you need to look at the lower transmit power regime (e.g., -20 to 10 dBm). If you select that range, then you will see a gap of exactly 10 dB, which corresponds to the difference in the pathloss.

    If you are asking why UE3 and UE4 are stuck at 1.1Mbps, it is because in the standard, the farUE is limited to the CQIs of QPSK, and therefore it is not able to switch to higher CQIs when the SNR is higher. That is why it gets stuck at 1.1Mbps.

    Best,
    Bashar

    #14912
    alex sunny
    Participant

    thanks for the awesome information.

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