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ADRadioNet Library
  • Wireless Sensor Networks Library
ADRadioNet Library
Documents FAQ: ADRadioNet - "Upstream" and "Downstream"
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    • FAQ: ADRadioNet - Features & Value Proposition
    • FAQ: ADRadioNet - "Upstream" and "Downstream"
    • FAQ: ADRadioNet radio profiles with ADF7024
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FAQ: ADRadioNet - "Upstream" and "Downstream"

The ADRadioNet protocol defines 10 channels in each ISM band that is supported as part of the offering. On a given node, any channel or all channels can be chosen to send data, and one channel has to be chosen for receiving the data.

Consider the following scenario, where the sensor mote (E) is sending sensor data to the Center Point (CP) via the Router (R). One may choose the first channel (or any one of the available channels) as Downstream channel - to receive the data from upper orbits, and the remaining 9 channels can be used to transmit data to lower orbits. (a.k.a Upstream Channels).

The mote (E) is sending data to the Router (R):       => on mote's Upstream channel

The Router (R) is receiving data from the mote (E):  <=  on router's Downstream channel

The Router (R) is sending data to the Center (CP):   =>  on router's Upstream channel

The Center (CP) is receiving data from Router (R):   <=  on CP's Downstream channel

Now, don't be bamboozled looking at the following statement. Take a deep breath, and digest the information

The mote (E) is receiving data from the Router (R):  <=  on router's Downstream channel, which is nothing but the mote's Upstream channel

It shall be noted that there is no downstream channel for endpoints or no upstream channel for center point. This is because the end points will be positioned in the outermost orbit and obviously won’t be allowed to receive any data from the next higher orbits. Likewise as the center point does not have any other lower orbit, it does not need any upstream channel.

In-order to have successful communication of data, at least one of the up channel frequency of the nodes in upper orbits (EP/Routers) must be equal to the down channel frequency of the lower orbits (CP/Router).The acknowledgement is sent using the same channels as the upstream data, using the channel information that was added in the packet at each hop.

This FAQ was generated from the following discussion: What is "Upstream" and "Downstream" in ADRadioNet

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