Issue link: https://read.uberflip.com/i/1540208
Regional Parameters RP002-1.0.5 ©2022-2025 LoRa Alliance ® Page 44 of 116 The authors reserve the right to change specifications without notice. 3.5.5 US902-928 LinkADRReq Command 848 The US902-928 channel plan of LoRaWAN supports a minimum of 72 and a maximum of 80 849 channels. The ChMaskCntl field of the LinkADRReq command has the following meaning: 850 851 ChMaskCntl ChMask Applies To 0 Channels 0 to 15 1 Channels 16 to 31 2 Channels 32 to 47 3 Channels 48 to 63 4 Channels 64 to 79 5 8 LSBs (bits 0-7) control Channel Blocks 0 to 7, bit 9 controls Channel Block 9 only when channels in this block have been previously created. Bit 8 and 6 MSBs (bits 10-15) are RFU. 6 All default 125 kHz ON: ChMask applies to channels 64 to 79 7 All default 125 kHz OFF: ChMask applies to channels 64 to 79 Table 23: US902-928 ChMaskCntl value 852 If ChMaskCntl = 5 6 , bits 0-7 in the ChMask enable and disable a bank of eight 125 kHz 853 channels and the corresponding 500 kHz channel defined by the following calculation: 854 [ChannelMaskBit * 8, ChannelMaskBit * 8 +7],64+ChannelMaskBit. Bit 9 in the 855 ChMask enable and disable a bank of eight channels defined by the following calculation: 856 [ChannelMaskBit * 8, ChannelMaskBit * 8 +7]. 857 If ChMaskCntl = 6, all 125 kHz channels are enabled. If ChMaskCntl = 7, all 125 kHz 858 channels are disabled. Simultaneously, the channels 64 to 79 are set according to the ChMask 859 bit mask. The data rate specified in the command need not be valid for channels specified in 860 the ChMask, as it governs the global operational state of the end-device. 861 Notes: 862 - FCC regulation requires hopping over at least 50 channels when using 863 maximum output power. This is achieved either when more than 50 864 LoRa/125 kHz channels are enabled and/or when at least one LR-FHSS 865 channel is enabled. It is possible to have end-devices with less channels 866 when limiting the conducted transmit power of the end-device to 21 867 dBm. 868 - A common Network Server action may be to reconfigure a device 869 through multiple LinkADRReq commands in a contiguous block of MAC 870 commands. For example, to reconfigure a device from 64 channel 871 operation to the first 8 channels could contain two LinkADRReq 872 commands, the first (ChMaskCntl = 7) to disable all 125 kHz channels 873 and the second (ChMaskCntl = 0) to enable a bank of 8 125 kHz 874 channels. Alternatively, using ChMaskCntl = 5, a device can be re- 875 configured from 64 channel operation to support the first 8 channels in 876 a single LinkADRReq. 877 878 879 6 Added in LoRaWAN Regional Parameters Specification version 1.0.3rA.