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LoRaWAN® Regional Parameters v1.0.3revA

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LoRaWAN 1.0.3 Regional Parameters ©2018 LoRa™ Alliance Page 25 of 71 The authors reserve the right to change specifications without notice. 1 61 53 2 133 125 3 250 242 4 250 242 5:7 Not defined 8 61 53 9 137 129 10 250 242 11 250 242 12 250 242 13 250 242 14:15 Not defined Table 16 : US902-928 maximum payload size (not repeater compatible) 550 2.3.7 US902-928 Receive windows 551 • The RX1 receive channel is a function of the upstream channel used to initiate the 552 data exchange. The RX1 receive channel can be determined as follows. 553 o RX1 Channel Number = Transmit Channel Number modulo 8 554 • The RX1 window data rate depends on the transmit data rate (see Table 17 below). 555 • The RX2 (second receive window) settings uses a fixed data rate and frequency. 556 Default parameters are 923.3MHz / DR8 557 558 Upstream data rate Downstream data rate RX1DROffset 0 1 2 3 DR0 DR10 DR9 DR8 DR8 DR1 DR11 DR10 DR9 DR8 DR2 DR12 DR11 DR10 DR9 DR3 DR13 DR12 DR11 DR10 DR4 DR13 DR13 DR12 DR11 Table 17: US902-928 downlink RX1 data rate mapping 559 The allowed values for RX1DROffset are in the [0:3] range. Values in the range [4:7] are 560 reserved for future use. 561 2.3.8 US902-928 Class B beacon 562 The beacons SHALL BE transmitted using the following settings: 563 DR 8 Corresponds to SF12 spreading factor with 500kHz bw CR 1 Coding rate = 4/5 Signal polarity Non-inverted As opposed to normal downlink traffic which uses inverted signal polarity frequencies 923.3 to 927.5MHz with 600kHz steps Beaconing is performed on the same channel that normal downstream traffic as defined in the Class A specification Table 18: US902-928 beacon settings 564 The downstream channel used for a given beacon is: 565 Channel = [ ( _ _ )] 8 566 • whereby beacon_time is the integer value of the 4 bytes "Time" field of the beacon 567 frame 568 • whereby beacon_period is the periodicity of beacons , 128 seconds 569 • whereby floor(x) designates rounding to the integer immediately inferior or equal to x 570

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