Issue link: https://read.uberflip.com/i/1479525
LoRaWAN® Regional Parameters RP002-1.0.4 ©2022 LoRa Alliance ® Page 28 of 101 The authors reserve the right to change specifications without notice. MAX_FCNT_GAP 10 16384 ADR_ACK_LIMIT 64 ADR_ACK_DELAY 32 RETRANSMIT_TIMEOUT 2s +/- 1s (random delay between 1 and 3 seconds) DownlinkDwellTime 0 (No downlink dwell time enforced; impacts data rate offset calculations) UplinkDwellTime Uplink dwell time is country-specific and it is the responsibility of the end-device to comply with such regulations PING_SLOT_PERIODICITY 7 (2^7 = 128s) PING_SLOT_DATARATE The value of the BEACON data rate (DR) defined for each regional band PING_SLOT_CHANNEL Defined in each regional band CLASS_B_RESP_TIMEOUT 8s 11 CLASS_C_RESP_TIMEOUT 8s 12 If the actual parameter values implemented in the end-device are different from these default 427 values (for example, the end-device uses a longer JOIN_ACCEPT_DELAY1 and 428 JOIN_ACCEPT_DELAY2 latency), those parameters SHALL be communicated to the 429 Network Server using an out-of-band channel during the end-device commissioning process. 430 The Network Server MAY reject parameters different from these default values. 431 RETRANSMIT_TIMEOUT was known as ACK_TIMEOUT in versions prior to 1.0.4 of the 432 LoRaWAN specification. It is renamed in version 1.0.4 and subsequent versions of the 433 LoRaWAN specification to better reflect its intended use. 434 Medium Access Control (MAC) commands exist in the LoRaWAN specification to change the 435 value of RECEIVE_DELAY1 (using RXTimingSetupReq, RXTimingSetupAns) as well as 436 ADR_ACK_LIMIT and ADR_ACK_DELAY (using ADRParamSetupReq, 437 ADRParamSetupAns). Also, RXTimingSettings are transmitted to the end-device along with 438 the JOIN_ACCEPT message in OTAA mode. 439 The default values for PING_SLOT_PERIODICITY, PING_SLOT_DATARATE, and 440 PING_SLOT_CHANNEL MAY be adjusted using Class B MAC commands. 441 End-devices SHALL select transmit channels in a pseudo-random fashion and in such a way 442 that all enabled channels that are not currently duty-cycle-restricted SHALL be used once 443 before any channel is re-used for transmission. 444 Note: End-devices are required to use all default channels when attempting to join a 445 network. There is no requirement that the network or any specific gateway support all 446 default channels for any given region. 447 448 10 MAX_FCNT_GAP was deprecated and removed from LoRaWAN 1.0.4 and subsequent versions. 11 CLASS_B_RESP_TIMEOUT must always be greater than the largest possible value of RETRANSMIT_TIMEOUT plus the maximum possible time-on-air of an uplink frame. 12 CLASS_C_RESP_TIMEOUT must always be greater than the largest possible value of RETRANSMIT_TIMEOUT plus the maximum possible time-on-air of an uplink frame.