Issue link: https://read.uberflip.com/i/1428362
LoRaWAN 1.0.2 Regional Parameters ©2017 LoRa Alliance™ Page 13 of 55 The authors reserve the right to change specifications without notice. 2.2 US 902-928MHz ISM Band 379 This section defines the regional parameters for the USA, Canada and all other countries 380 adopting the entire FCC-Part15 regulations in 902-928 ISM band. 381 2.2.1 US902-928 Preamble Format 382 The following synchronization words should be used: 383 384 Modulation Sync word Preamble length LORA 0x34 8 symbols 385 LoRaWAN does not make use of GFSK modulation in the US902-928 ISM band. 386 2.2.2 US902-928 Channel Frequencies 387 The 915 MHz ISM Band shall be divided into the following channel plans. 388 Upstream – 64 channels numbered 0 to 63 utilizing LoRa 125 kHz BW varying from 389 DR0 to DR3, using coding rate 4/5, starting at 902.3 MHz and incrementing linearly 390 by 200 kHz to 914.9 MHz 391 Upstream – 8 channels numbered 64 to 71 utilizing LoRa 500 kHz BW at DR4 392 starting at 903.0 MHz and incrementing linearly by 1.6 MHz to 914.2 MHz 393 Downstream – 8 channels numbered 0 to 7 utilizing LoRa 500 kHz BW at DR8 to 394 DR13, starting at 923.3 MHz and incrementing linearly by 600 kHz to 927.5 MHz 395 396 397 Figure 1: US902-928 channel frequencies 398 915 MHz ISM band end-devices are required to operate in compliance with the relevant 399 regulatory specifications, to include. 400 Frequency-Hopping, Spread-Spectrum (FHSS) mode, which requires the device 401 transmit at a measured conducted power level no greater than +30 dBm, for a period 402 of no more than 400 msec and over at least 50 channels, each of which occupy no 403 greater than 250 kHz of bandwidth. 404 Digital Transmission System (DTS) mode, which requires that the device use 405 channels greater than or equal to 500 kHz and comply to a conducted Power 406 Spectral Density measurement of no more than +8 dBm per 3kHz of spectrum. In 407 practice, this limits the conducted output power of an end-device to +26 dBm. 408 Hybrid mode, which requires that the device transmit over multiple channels (this 409 may be less than the 50 channels required for FHSS mode, but is recommended to 410 be at least 4) while complying with the Power Spectral Density requirements of DTS 411 mode and the 400 msec dwell time of FHSS mode. In practice this limits the 412 measured conducted power of the end-device to 21 dBm. 413 Devices which use an antenna system with a directional gain greater than +6 dBi, but 414 reduce the specified conducted output power by the amount in dB of directional gain 415 over +6 dBi. 416 903.0 902.3 904.6 914.2 …. 923.3 923.9 927.5 …. 8x downlink channels 64 + 8 uplink channels