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LoRaWAN 1.0.2 Regional Parameters ©2017 LoRa Alliance™ Page 19 of 55 The authors reserve the right to change specifications without notice. 2.3 China 779-787MHz ISM Band 527 2.3.1 CN779-787 Preamble Format 528 The following synchronization words should be used : 529 530 Modulation Sync word Preamble length LORA 0x34 8 symbols GFSK 0xC194C1 5 bytes Table 18: CN779-787 synch words 531 2.3.2 CN779-787 ISM Band channel frequencies 532 533 The LoRaWAN can be used in the Chinese 779-787MHz band as long as the radio device 534 EIRP is less than 12.15dBm. 535 The end-device transmit duty-cycle should be lower than 1%. 536 The LoRaWAN channels center frequency can be in the following range: 537 Minimum frequency : 779.5MHz 538 Maximum frequency : 786.5 MHz 539 CN780MHz end-devices should be capable of operating in the 779 to 787 MHz frequency 540 band and should feature a channel data structure to store the parameters of at least 16 541 channels. A channel data structure corresponds to a frequency and a set of data rates 542 usable on this frequency. 543 The first three channels correspond to 779.5, 779.7 and 779.9 MHz with DR0 to DR5 and 544 must be implemented in every end-device. Those default channels cannot be modified 545 through the NewChannelReq command and guarantee a minimal common channel set 546 between end-devices and gateways of all networks. Other channels can be freely distributed 547 across the allowed frequency range on a network per network basis. 548 The following table gives the list of frequencies that should be used by end-devices to 549 broadcast the JoinReq message The JoinReq message transmit duty-cycle shall follow the 550 rules described in chapter "Retransmissions back-off" of the LoRaWAN specification 551 document. 552 553 Modulation Bandwidth [kHz] Channel Frequency [MHz] FSK Bitrate or LoRa DR / Bitrate Nb Channels Duty cycle LoRa 125 779.5 779.7 779.9 780.5 780.7 780.9 DR0 – DR5 / 0.3-5 kbps 6 <0.1% Table 19: CN780 JoinReq Channel List 554 555

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