Issue link: https://read.uberflip.com/i/1428359
LoRaWAN 1.0.3 Regional Parameters ©2018 LoRa™ Alliance Page 27 of 71 The authors reserve the right to change specifications without notice. 2.4 CN779-787 MHz ISM Band 596 2.4.1 CN779-787 Preamble Format 597 The following synchronization words SHOULD be used : 598 599 Modulation Sync word Preamble length LORA 0x34 8 symbols GFSK 0xC194C1 5 bytes Table 19: CN779-787 synch words 600 2.4.2 CN779-787 ISM Band channel frequencies 601 602 The LoRaWAN can be used in the Chinese 779-787MHz band as long as the radio device 603 EIRP is less than 12.15dBm. 604 The end-device transmit duty-cycle SHOULD be lower than 1%. 605 The LoRaWAN channels center frequency MAY be in the following range: 606 • Minimum frequency : 779.5MHz 607 • Maximum frequency : 786.5 MHz 608 CN780MHz end-devices SHALL be capable of operating in the 779 to 787 MHz frequency 609 band and SHALL feature a channel data structure to store the parameters of at least 16 610 channels. A channel data structure corresponds to a frequency and a set of data rates usable 611 on this frequency. 612 The first three channels correspond to 779.5, 779.7 and 779.9 MHz with DR0 to DR5 and 613 MUST be implemented in every end-device. Those default channels cannot be modified 614 through the NewChannelReq command and guarantee a minimal common channel set 615 between end-devices and gateways of all networks. Other channels can be freely distributed 616 across the allowed frequency range on a network per network basis. 617 The following table gives the list of frequencies that SHALL be used by end-devices to 618 broadcast the JoinReq message The JoinReq message transmit duty-cycle SHALL follow the 619 rules described in chapter "Retransmissions back-off" of the LoRaWAN specification 620 document. 621 622 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 20: CN779-787 JoinReq Channel List 623 624 2.4.3 CN779-787 Data Rate and End-device Output Power encoding 625 There is no dwell time limitation for the CN779-787 PHY layer. The TxParamSetupReq MAC 626 command is not implemented by CN779-787 devices. 627