Issue link: https://read.uberflip.com/i/1428395
LoRaWAN ® L2 1.0.4 Specification © 2020 LoRa Alliance ® Page 20 of 90 The authors reserve the right to change specifications without notice. 603 For fixed channel plan regions (US, AU, CN, etc.), end-devices SHALL enable all channels. 604 For dynamic channel plan regions (EU, IN, AS, etc.), end-devices SHALL enable the region's 605 default channels and make no change to the configuration of the dynamically configured 606 channels. 607 608 Note: Not requiring an immediate response to an ADR acknowledgment 609 request provides flexibility to the Network to schedule its downlinks in an 610 optimal manner. 611 612 Table 9 provides an example of a data rate backoff sequence, assuming ADR_ACK_LIMIT is 613 set to 64 and ADR_ACK_DELAY is equal to 32. 614 615 ADRACKCnt ADRACKReq Data Rate TX Power NbTrans Channel Mask 0 to 63 0 DR1 Max –9 dBm 3 Normal operations channel mask 64 to 95 1 No change No change No change No change 96 to 127 1 No change Default No change No change 128 to 159 1 DR0 (Default) Default No change No change ≥ 160 1 DR0 (Default) Default 1 For dynamic channel plans: re-enable default channels. For fixed channel plans: All channels enabled Table 9: Example of a data rate backoff sequence 616 4.3.1.2 Frame acknowledge bit and acknowledgment procedure (ACK in FCtrl) 617 When receiving a confirmed data frame, the receiver responds with a data frame that has the 618 acknowledgment bit (ACK) set. If the Network receives such a confirmed frame it SHOULD 619 send an acknowledgment. If the Network sends an acknowledgement it SHALL send it using 620 one of the Class A receive windows opened by the end-device after the send operation. If an 621 end-device receives such a confirmed frame in one of its Class A receive windows, it SHALL 622 transmit an acknowledgment with its next uplink. If an end-device receives such a confirmed 623 frame outside of its Class A receive windows, i.e. in a Class B ping slot (see section 9) or in 624 RXC (see section 15), it SHOULD send an acknowledgement. 625 Acknowledgments SHALL only be sent in response to the latest frame received and SHALL 626 NOT be transmitted more than NbTrans times. The Network SHALL only send an 627 acknowledgment in the Class A receive windows (RX1/RX2) of the confirmed uplink that 628 requested it. 629