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LoRaWAN Regional Parameters ©2016 LoRa™ Alliance Page 17 of 45 The authors reserve the right to change specifications without notice. 2.3 China 779-787MHz ISM Band 1 2.3.1 CN779-787 Preamble Format 2 The following synchronization words should be used : 3 4 Modulation Sync word Preamble length LORA 0x34 8 symbols GFSK 0xC194C1 5 bytes Table 15: CN779-787 synch words 5 2.3.2 CN779-787 ISM Band channel frequencies 6 7 The LoRaWAN can be used in the Chinese 779-787MHz band as long as the radio device 8 ERP is less than 10mW (or 10dBm). 9 The end-device transmit duty-cycle should be lower than 1%. 10 The LoRaWAN channels center frequency can be in the following range: 11 Minimum frequency : 779.5MHz 12 Maximum frequency : 786.5 MHz 13 CN780MHz end-devices should be capable of operating in the 779 to 787 MHz frequency 14 band and should feature a channel data structure to store the parameters of at least 16 15 channels. A channel data structure corresponds to a frequency and a set of data rates 16 usable on this frequency. 17 The first three channels correspond to 779.5, 779.7 and 779.9 MHz with DR0 to DR5 and 18 must be implemented in every end-device. Those default channels cannot be modified 19 through the NewChannelReq command and guarantee a minimal common channel set 20 between end-devices and gateways of all networks. Other channels can be freely distributed 21 across the allowed frequency range on a network per network basis. 22 The following table gives the list of frequencies that should be used by end-devices to 23 broadcast the JoinReq message The JoinReq message transmit duty-cycle shall follow the 24 rules described in chapter "Retransmissions back-off" of the LoRaWAN specification 25 document. 26 27 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 16: CN780 JoinReq Channel List 28

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