[Sangmi Moon]

Hello,

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?

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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.
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// 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.

[Martin Taranetz]

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,
Martin.

[Author]

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