Issue link: https://read.uberflip.com/i/1428395
LoRaWAN ® L2 1.0.4 Specification © 2020 LoRa Alliance ® Page 80 of 90 The authors reserve the right to change specifications without notice. 2406 Figure 8: Uplink timing diagram for unconfirmed data frames, NbTrans>2 2407 2408 The end-device transmits up to NbTrans times the same unconfirmed uplink. The uplink 2409 frame counter Cu is kept constant for the retransmissions. In this example, first transmission 2410 is received correctly by the Network Server. No downlink transmission occurs in the 2411 corresponding class A windows, as no response is required: Network Server might not have 2412 data or MAC commands to transmit to the end-device, or a downlink transmission to another 2413 end-device might be active. In the absence of downlink, end-device waits an arbitrary delay 2414 after the end of second class A window, before transmitting the uplink again with same Cu, 2415 using a different channel. A data downlink frame is then received, on the first class A window 2416 following this second transmission. As a consequence of this downlink reception, the third 2417 transmission does not occur. 2418 This transmission complies with all the specified behaviors defined in this document, including 2419 channel selection, timing randomization and duty-cycle limitations. 2420 2421 16.2 Uplink Timing Diagram for Confirmed Data Frames 2422 The following diagram illustrates the steps executed by an end-device transmitting two 2423 confirmed data frames (Data0 and Data1) with NbTrans=1. 2424 2425