DLC receive windows
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Tagged: DLC RX2 RECV
Jason Reiss.
alejandro ballestaHi multitech team,
one question regarding the AT+DLC and receive windows. In class A there can be up to 2 receive windows after the device uplink transmission.
If I am using the xdot as a modem, I mean using AT commands, how can I check if I have received one or two frames after the transmission?
I can check the DLC counter and see if it has increased, but after the transmission it may have increased zero, one or two units, meaning some downlink frames have been received.
In the case two frames have been received, how can I get the payload from both two. The RECV command just dislays the last one, right?
Should I execute AT+DLC twice after the SEND command. First one 1s after the tx, and another one 1s after that?
thanks and keep up the good work!
Jason ReissOnly one downlink will be sent in either window. In LoRaWAN there is only one pending uplink or downlink frame.
alejandro ballestathanks Jason
I suppose that if both rx windows are available you can receive up to 2 downlink frames after the uplink one.
Regards
Jason ReissOnly one downlink will be sent in either the Rx1 or the Rx2 window in response to the uplink. The network server will not schedule a downlink for both windows.
The LoRaWAN protocol cannot support sending two packets in response to an uplink. It would compromise the MAC command and ACK behavior. There is only one outstanding packet in either direction.
The two Rx windows can be used to attempt to respond to simultaneous uplinks from two devices. Depending on the datarate used the downlink may exceed the 1 second between Rx windows. A packet could not be scheduled for the seconds device.