Issue link: https://read.uberflip.com/i/1428362
LoRaWAN 1.0.2 Regional Parameters ©2017 LoRa Alliance™ Page 24 of 55 The authors reserve the right to change specifications without notice. 2.4 EU 433MHz ISM Band 640 2.4.1 EU433 Preamble Format 641 The following synchronization words should be used : 642 643 Modulation Sync word Preamble length LORA 0x34 8 symbols GFSK 0xC194C1 5 bytes Table 26: EU433 synch words 644 2.4.2 EU433 ISM Band channel frequencies 645 The LoRaWAN can be used in the ETSI 433-434 MHz band as long as the radio device 646 EIRP is less than 12.15dBm. 647 The end-device transmit duty-cycle should be lower than 1% 1 648 The LoRaWAN channels center frequency can be in the following range: 649 Minimum frequency : 433.175 MHz 650 Maximum frequency : 434.665 MHz 651 EU433 end-devices should be capable of operating in the 433.05 to 434.79 MHz frequency 652 band and should feature a channel data structure to store the parameters of at least 16 653 channels. A channel data structure corresponds to a frequency and a set of data rates 654 usable on this frequency. 655 The first three channels correspond to 433.175, 433.375 and 433.575 MHz with DR0 to DR5 656 and must be implemented in every end-device. Those default channels cannot be modified 657 through the NewChannelReq command and guarantee a minimal common channel set 658 between end-devices and gateways of all networks. Other channels can be freely distributed 659 across the allowed frequency range on a network per network basis. 660 The following table gives the list of frequencies that should be used by end-devices to 661 broadcast the JoinReq message. The JoinReq message transmit duty-cycle shall follow the 662 rules described in chapter "Retransmissions back-off" of the LoRaWAN specification 663 document. 664 665 Modulation Bandwidth [kHz] Channel Frequency [MHz] FSK Bitrate or LoRa DR / Bitrate Nb Channels Duty cycle LoRa 125 433.175 433.375 433.575 DR0 – DR5 / 0.3-5 kbps 3 <1% Table 27: EU433 JoinReq Channel List 666 667 1 The EN300220 ETSI standard limits to 10% the maximum transmit duty-cycle in the 433MHz ISM band. The LoRaWAN requires a 1% transmit duty-cycle lower than the legal limit to avoid network congestion.