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TS001-1.0.4 LoRaWAN® L2 1.0.4 Specification

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LoRaWAN ® L2 1.0.4 Specification © 2020 LoRa Alliance ® Page 79 of 90 The authors reserve the right to change specifications without notice. 16 Informative Examples 2375 The following examples are illustrations of the LoRaWAN specification for informational 2376 purposes only and are not part of the formal specification. 2377 16.1 Uplink Timing Diagram for Unconfirmed Data Frames 2378 The following diagram illustrates the steps executed by an end-device transmitting a single 2379 unconfirmed data frame: 2380 2381 2382 2383 2384 Figure 7: Uplink timing diagram for unconfirmed data frames, NbTrans=1 2385 2386 The end-device first transmits an unconfirmed data frame at an arbitrary instant and on an 2387 arbitrary channel. The uplink frame counter Cu is simply derived by adding 1 to the previous 2388 uplink frame counter. The Network Server receives the frame and may generate a downlink 2389 frame containing an application payload and/or MAC commands exactly RECEIVE_DELAY1 2390 or RECEIVE_DELAY2 seconds later, using either the first or second Class A receive windows, 2391 respectively. This downlink frame uses a data rate and channel specified by the regional 2392 channel plan defined in [RP002]. The downlink frame counter Cd is also derived by adding 1 2393 to the downlink frame counter previously used to transmit to that specific end-device. 2394 The uplink frame counter obeys the constraints imposed by NbTrans: the end-device is 2395 compelled to transmit the uplink NbTrans times or until a downlink is received in the Class 2396 A receive windows. In this example, as NbTrans=1, the next uplink will be sent with 2397 FCntUp = Cu + 1. This transmission complies with all the specified behaviors defined in this 2398 document, including channel selection, timing randomization and duty-cycle limitations. 2399 2400 2401 The following diagram illustrates another example, where an end-device transmits a single 2402 payload with unconfirmed uplink data frames, using NbTrans = 3. 2403 2404 2405

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