Packet overhead

We have simulated this where the receivers shut down periodically. This is to simulate different scenarios like a self-driving car going through a tunnel, or a satellite going out of reach of a receiver, etc.

75% down-time

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{
  "experiments": [
    {
      "channel": {
        "latency": 1,
        "loss": [
          0,
          1,
          2,
          3,
          4,
          5
        ]
      },
      "perpetual": {
        "decoder": {
          "block_bytes": 100000,
          "deactivate_threshold": 0.75,
          "packet_bytes": 100,
          "width": 3
        },
        "encoder": {
          "block_bytes": 100000,
          "packet_bytes": 100,
          "packet_interval": 1,
          "width": 3
        }
      },
      "retransmitter": {
        "receiver": {
          "block_bytes": 100000,
          "deactivate_threshold": 0.75,
          "packet_bytes": 100
        },
        "sender": {
          "block_bytes": 100000,
          "packet_bytes": 100,
          "packet_interval": 1
        }
      },
      "runs": 20,
      "seed": 1635849203.4645057,
      "users": 100
    }
  ],
  "name": "perpetual_retransmitter",
  "plot": {
    "colors": {
      "perpetual": "#ed4969",
      "retransmitter": "#386cb0"
    },
    "legends": {
      "perpetual": "Perpetual",
      "retransmitter": "Retransmitter"
    }
  }
}

---

Show study Download study

{
  "experiments": [
    {
      "channel": {
        "latency": 1,
        "loss": [
          0,
          1,
          2,
          3,
          4,
          5
        ]
      },
      "perpetual": {
        "decoder": {
          "block_bytes": 100000,
          "deactivate_threshold": 0.75,
          "packet_bytes": 100,
          "width": 3
        },
        "encoder": {
          "block_bytes": 100000,
          "packet_bytes": 100,
          "packet_interval": 1,
          "width": 3
        }
      },
      "retransmitter": {
        "receiver": {
          "block_bytes": 100000,
          "deactivate_threshold": 0.75,
          "packet_bytes": 100
        },
        "sender": {
          "block_bytes": 100000,
          "packet_bytes": 100,
          "packet_interval": 1
        }
      },
      "runs": 20,
      "seed": 1635849203.4645057,
      "users": 100
    }
  ],
  "name": "perpetual_retransmitter",
  "plot": {
    "colors": {
      "perpetual": "#ed4969",
      "retransmitter": "#386cb0"
    },
    "legends": {
      "perpetual": "Perpetual",
      "retransmitter": "Retransmitter"
    }
  }
}

---

50% down-time

Show study Download study

{
  "experiments": [
    {
      "channel": {
        "latency": 1,
        "loss": [
          0,
          1,
          2,
          3,
          4,
          5
        ]
      },
      "perpetual": {
        "decoder": {
          "block_bytes": 100000,
          "deactivate_threshold": 0.5,
          "packet_bytes": 100,
          "width": 3
        },
        "encoder": {
          "block_bytes": 100000,
          "packet_bytes": 100,
          "packet_interval": 1,
          "width": 3
        }
      },
      "retransmitter": {
        "receiver": {
          "block_bytes": 100000,
          "deactivate_threshold": 0.5,
          "packet_bytes": 100
        },
        "sender": {
          "block_bytes": 100000,
          "packet_bytes": 100,
          "packet_interval": 1
        }
      },
      "runs": 20,
      "seed": 1635854339.4228475,
      "users": 100
    }
  ],
  "name": "perpetual_retransmitter",
  "plot": {
    "colors": {
      "perpetual": "#ed4969",
      "retransmitter": "#386cb0"
    },
    "legends": {
      "perpetual": "Perpetual",
      "retransmitter": "Retransmitter"
    }
  }
}

---

Show study Download study

{
  "experiments": [
    {
      "channel": {
        "latency": 1,
        "loss": [
          0,
          1,
          2,
          3,
          4,
          5
        ]
      },
      "perpetual": {
        "decoder": {
          "block_bytes": 100000,
          "deactivate_threshold": 0.5,
          "packet_bytes": 100,
          "width": 3
        },
        "encoder": {
          "block_bytes": 100000,
          "packet_bytes": 100,
          "packet_interval": 1,
          "width": 3
        }
      },
      "retransmitter": {
        "receiver": {
          "block_bytes": 100000,
          "deactivate_threshold": 0.5,
          "packet_bytes": 100
        },
        "sender": {
          "block_bytes": 100000,
          "packet_bytes": 100,
          "packet_interval": 1
        }
      },
      "runs": 20,
      "seed": 1635854339.4228475,
      "users": 100
    }
  ],
  "name": "perpetual_retransmitter",
  "plot": {
    "colors": {
      "perpetual": "#ed4969",
      "retransmitter": "#386cb0"
    },
    "legends": {
      "perpetual": "Perpetual",
      "retransmitter": "Retransmitter"
    }
  }
}

---

Note that despite the receiver down-periods, Otacast uses fewer packets to complete a file, and that this barely changes with the packet loss. This goes for both cases of down-time.