Issue link: https://read.uberflip.com/i/1428371
LoRaWAN Regional Parameters ©2016 LoRa™ Alliance Page 12 of 45 The authors reserve the right to change specifications without notice. 2.2 US 902-928MHz ISM Band 1 2.2.1 US902-928 Preamble Format 2 The following synchronization words should be used: 3 4 Modulation Sync word Preamble length LORA 0x34 8 symbols LoRaWAN does not make use of GFSK modulation in the US902-928 ISM band. 5 2.2.2 US902-928 Channel Frequencies 6 The 915 MHz ISM Band shall be divided into the following channel plans. 7 Upstream – 64 channels numbered 0 to 63 utilizing LoRa 125 kHz BW varying from 8 DR0 to DR3, using coding rate 4/5, starting at 902.3 MHz and incrementing linearly 9 by 200 kHz to 914.9 MHz 10 Upstream – 8 channels numbered 64 to 71 utilizing LoRa 500 kHz BW at DR4 11 starting at 903.0 MHz and incrementing linearly by 1.6 MHz to 914.2 MHz 12 Downstream – 8 channels numbered 0 to 7 utilizing LoRa 500 kHz BW at DR8 to 13 DR13) starting at 923.3 MHz and incrementing linearly by 600 kHz to 927.5 MHz 14 15 16 Figure 1: US902-928 channel frequencies 17 915 MHz ISM band end-devices should use the following default parameters: 18 Default radiated transmit output power: 20 dBm 19 o Devices, when transmitting with 125 kHz BW may use a maximum of 20 +30 dBm. The transmission shall never last more than 400 ms. 21 o Devices, when transmitting with 500 kHz BW may use a maximum of 22 +26 dBm 23 US902-928 end-devices should be capable of operating in the 902 to 928 MHz frequency 24 band and should feature a channel data structure to store the parameters of 72 channels. A 25 channel data structure corresponds to a frequency and a set of data rates usable on this 26 frequency. 27 If using the over-the-air activation procedure, the end-device should broadcast the JoinReq 28 message alternatively on a random 125 kHz channel amongst the 64 channels defined using 29 DR0 and a random 500 kHz channel amongst the 8 channels defined using DR4. The end- 30 device should change channel for every transmission. 31 Personalized devices shall have all 72 channels enabled following a reset. 32 903.0 902.3 904.6 914.2 …. 923.3 923.9 927.5 …. 8x downlink channels 64 + 8 uplink channels