Issue link: https://read.uberflip.com/i/1428362
LoRaWAN 1.0.2 Regional Parameters ©2017 LoRa Alliance™ Page 14 of 55 The authors reserve the right to change specifications without notice. US902-928 end-devices MUST be capable of operating in the 902 to 928 MHz frequency 417 band and MUST feature a channel data structure to store the parameters for 72 channels. 418 This channel data structure contains a list of frequencies and the set of data rates available 419 for each frequency. 420 If using the over-the-air activation procedure, it is recommended that the end-device transmit 421 the JoinRequest message alternatively on a random 125 kHz channel amongst the 64 422 channels defined using DR0 and a random 500 kHz channel amongst the 8 channels 423 defined using DR4. The end-device SHALL change channel for every transmission. For 424 rapid network acquisition in mixed channel plan environments, it is further recommended 425 that the device follow a channel selection sequence (still random) which efficiently probes 426 the groups of nine (8 + 1) channels which are typically implemented by smaller gateways 427 (channel groups 0-7+64, 8-15+65, etc.). 428 Personalized devices shall have all 72 channels enabled following a reset and shall use the 429 channels for which the device's default data-rate is valid. 430 2.2.3 US902-928 Data Rate and End-device Output Power encoding 431 FCC regulation imposes a maximum dwell time of 400ms on uplinks. The 432 TxParamSetupReq is not implemented by US902-928 devices. 433 The following encoding is used for Data Rate (DR) and End-device conducted Power 434 (TXPower) in the US902-928 band: 435 436 DataRate Configuration Indicative physical bit rate [bit/sec] 0 LoRa: SF10 / 125 kHz 980 1 LoRa: SF9 / 125 kHz 1760 2 LoRa: SF8 / 125 kHz 3125 3 LoRa: SF7 / 125 kHz 5470 4 LoRa: SF8 / 500 kHz 12500 5:7 RFU 8 LoRa: SF12 / 500 kHz 980 9 LoRa: SF11 / 500 kHz 1760 10 LoRa: SF10 / 500 kHz 3900 11 LoRa: SF9 / 500 kHz 7000 12 LoRa: SF8 / 500 kHz 12500 13 LoRa: SF7 / 500 kHz 21900 14:15 RFU Table 11: TX Data rate table 437 Note: DR4 is purposely identical to DR12, DR8..13 must be 438 implemented in end-devices and are reserved for future applications 439 440 TXPower Configuration (conducted power) 0 30 dBm – 2*TXpower 1 28 dBm 2 26 dBm 3 : 9 …. 10 10 dBm 11:15 RFU