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LoRaWAN® Regional Parameters RP002-1.0.4 ©2022 LoRa Alliance ® Page 42 of 101 The authors reserve the right to change specifications without notice. 2.5.7 US902-928 Receive Windows 788 • The RX1 receive channel is a function of the upstream channel used to initiate the data 789 exchange. The RX1 receive channel can be determined as follows: 790 o RX1 Channel Number = Transmit Channel Number modulo NbChannel, 791 where NbChannel is the number of active receive channels. 792 • The RX1 window data rate depends on the transmit data rate (see Table 21 below). 793 • The RX2 (second receive window) settings use a fixed data rate and frequency. 794 Default parameters are 923.3 MHz / DR8. 795 796 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 DR5 DR10 DR9 DR8 DR8 DR6 DR11 DR10 DR9 DR8 Table 21: US902-928 downlink RX1 data rate mapping 20 797 The allowed values for RX1DROffset are in the [0:3] range. Values in the range [4:7] are 798 reserved for future use. 799 2.5.8 US902-928 Class B Beacon 21 800 The default downstream channel used for a given beacon is: 801 Channel = [ ( _ _ ) ] 8 802 • where beacon_time is the integer value of the 4 bytes Time field of the beacon frame 803 • where beacon_period is the periodicity of beacons, 128 seconds 804 • where floor(x) designates rounding to the integer immediately inferior or equal to x 805 Example: The first beacon will be transmitted on 923.3 MHz, the second 806 on 923.9 MHz, the 9 th beacon will be on 923.3 MHz again. 807 808 Beacon Channel Number Frequency [MHz] 0 923.3 1 923.9 2 924.5 3 925.1 4 925.7 5 926.3 6 926.9 7 927.5 Table 22: US902-928 beacon channels 809 The beacon frame content is defined in section 4.1.3. 17 810 The default beacon data rate is DR8. 811 The default Class B PING_SLOT_CHANNEL is defined in the [TS001]. 812 20 Re-defined in the LoRaWAN 1.0.1 specification to eliminate RX1DROffset values beyond DR4. 21 Class B beacon operation was first defined in the LoRaWAN 1.0.3 specification.