What is ELSA, and what are the differences between the Models A, B, C and D described in ELSA?

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    ELSA is the acronym for “Enhanced Large Scale ATN deployment”. However, it is used as synonym for the results of the “VDL Mode 2 Measurement, Analysis and Simulation Campaign” that were produced by the “ELSA Consortium and Programme Partnership” for the SESAR Joint Undertaking between February 2015 and June 2016. The Final Report, Deliverable D11, was released on June 30th, 2016.

    One of ELSA recommendations for the optimization of the ground network was the “Introduction of alternate channels using reserved frequencies, addition of frequencies, and transition to one managed MF VDL2 network per Service area”. The concept of “one managed MF VDL2 network per Sevice area” is referred to as “Model D” in the ELSA documents. The other models are:

    • Model A: The initial situation in most parts of Europe, with a single VDL Mode 2 frequency shared by two different VDL M2 network operators (ARINC and SITA).
    • Model B: Two different networks as an Model A, but with additional, reserved frequencies. I.e., each of the additional frequencies is managed by only one service provider.
    • Model C: The initial situation in southern parts of Europa, with a single VDL Mode 2 frequency operated by only one network operator (ENAV)
    • Model C* (or C MF): Multiple VDL Mode 2 frequencies operated by only one network operator.
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