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10th meeting

continue discussion on example

packet loss

tx power values

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(08/Aug/2025)

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client/server application issue

divergence in the number of packets transmitted/received

  • Issue: the server was receiving only 6/10 packets.
  • Solution: change from UpdClientServer application to BulkSendApplication using TCP as protocol.

Old version using UdpClientServer

New version using BulkSendApplication

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TxPower values

setting different transmit power values for the ground node and satellite nodes

  • The example was mistakenly using the same TxPower values for the Ground Node and Sat. Nodes.
  • In TR 38.821 there are explicit TxPower values for the UE, but not for the Sat. Nodes.
    • We need to use the EIRP Density and get the TxPower for Sat. Nodes using the expression below

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next steps

  • Validation using traces?
  • Integrate GEO to helper?

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references

3GPP TR 38.821: https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=3525

UdpClientServer: https://www.nsnam.org/docs/release/3.45/doxygen/da/d7f/group__udpclientserver.html

BulkSendApplication: https://www.nsnam.org/docs/release/3.45/doxygen/db/d92/group__bulksend.html