Issue link: https://read.uberflip.com/i/1479525
LoRaWAN® Regional Parameters RP002-1.0.4 ©2022 LoRa Alliance ® Page 38 of 101 The authors reserve the right to change specifications without notice. Devices that use an antenna system with a directional gain greater than 686 +6 dBi reduce the specified conducted output power by the amount in 687 dB of directional gain over +6 dBi. 688 689 US902-928 end-devices SHALL be capable of operating in the 902 to 928 MHz frequency 690 band and SHALL feature a channel data structure to store the parameters for 72 channels. 691 This channel data structure contains a list of frequencies and the set of data rates available 692 for each frequency. 693 If using the over-the-air activation procedure, the end-device SHALL transmit the Join- 694 Request message on random 125 kHz channels amongst the 64 125 kHz channels defined 695 using DR0 and on 500 kHz channels amongst the 8 500kHz channels defined using DR4. The 696 end-device SHALL change channels for every transmission. 697 For rapid network acquisition in mixed gateway channel plan environments, the device 698 SHOULD follow a random channel selection sequence that efficiently probes the octet groups 699 of eight 125 kHz channels, followed by probing one 500 kHz channel on each pass. Each 700 consecutive pass SHOULD NOT select a channel that was used in a previous pass, until a 701 Join-Request is transmitted on every channel, after which the entire process can restart. 702 Example: 703 First pass: Random channel from [0-7], followed by [8-15]… [56-63], 704 then 64. 705 Second pass: Random channel from [0-7], followed by [8-15]… [56-63], 706 then 65. 707 Last pass: Random channel from [0-7], followed by [8-15]… [56-63], 708 then 71. 709 Personalized devices SHALL have all 72 channels enabled following a reset and SHALL use 710 the channels for which the device's default data-rate is valid. 711 2.5.3 US902-928 Data Rate and End-Device Output Power Encoding 712 For frequency hopping systems, FCC regulations impose a maximum dwell time of 400ms on 713 uplinks when the 20dB modulation bandwidth is less than 500 kHz. The TxParamSetupReq 714 MAC command is not implemented by US902-928 devices. 715 The following encoding is used for Data Rate (DR) and end-device conducted power 716 (TXPower) in the US902-928 band: 717 718 Data Rate Configuration Indicative Physical Bit Rate [bit/sec] 0 LoRa: SF10 / 125 kHz 980 1 LoRa: SF9 / 125 kHz 1760 2 LoRa: SF8 / 125 kHz 3125 3 LoRa: SF7 / 125 kHz 5470 4 LoRa: SF8 / 500 kHz 12500 5 LR-FHSS CR1/3: 1.523 MHz BW 162 6 LR-FHSS CR2/3: 1.523 MHz BW 325 7 RFU 8 LoRa: SF12 / 500 kHz 980 9 LoRa: SF11 / 500 kHz 1760 10 LoRa: SF10 / 500 kHz 3900 11 LoRa: SF9 / 500 kHz 7000