UE drop

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  • #5331
    Sangmi Moon


    I am using vienna DL SLS code.

    I want to know the diffenrece between the multiple drop and Vienna simulator(Single drop&mobility).

    Is there a difference in performance?

    Definition of drop:

    A “drop” is defined as one simulation run over a certain time period.
    A drop (or snapshot or channel segment) is a simulation entity where the random properties of the channel remain constant except for the fast fading caused by the changing phases of the rays. The constant properties during a single drop are, e.g., the powers, delays, and directions of the rays.

    // Vienna simulator (Single drop & Mobility)
    Single drop
    Large scale parameters / Small scale parameters are computed only when UE enters a new cube
    Within a cube, slight changes in Doppler effect, AoA, and AoD

    UE speed = 30km/h = 8.3m/s
    -> To move one face to another, it took 1/8.3~20ms
    -> Quite long simulation time is required. Or, coherence cube should be small.

    Thank you,

    Sangmi Moon.


    Dear Sangmi Moon,

    the Vienna LTE-A simulator is a dynamic event-driven simulator, i.e., it captures the evolution of the network status over time.
    In comparison, static snap-shot based approaches evaluate the network at a single point in time. Those tools are usually faster, but less accurate.

    Best regards,

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