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LoRaWAN® Regional Parameters v1.0.3revA

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LoRaWAN 1.0.3 Regional Parameters ©2018 LoRa™ Alliance Page 48 of 71 The authors reserve the right to change specifications without notice. 2.8 AS923MHz ISM Band 1148 2.8.1 AS923 Preamble Format 1149 The following synchronization words SHOULD be used: 1150 1151 Modulation Sync word Preamble length LORA 0x34 8 symbols GFSK 0xC194C1 5 bytes Table 48: AS923 synch words 1152 2.8.2 AS923 ISM Band channel frequencies 1153 This section applies to regions where the frequencies [923…923.5MHz] are comprised in the 1154 ISM band. 1155 The network channels can be freely attributed by the network operator. However the two 1156 following default channels MUST be implemented in every AS923MHz end-device. Those 1157 channels are the minimum set that all network gateways SHOULD always be listening on. 1158 1159 Modulation Bandwidth [kHz] Channel Frequency [MHz] FSK Bitrate or LoRa DR / Bitrate Nb Channels Duty cycle LoRa 125 923.20 923.40 DR0 to DR5 / 0.3-5 kbps 2 < 1% Table 49: AS923 default channels 1160 Those default channels MUST be implemented in every end-device and cannot be modified 1161 through the NewChannelReq command and guarantee a minimal common channel set 1162 between end-devices and network gateways. 1163 AS923MHz ISM band end-devices should use the following default parameters 1164 • Default EIRP: 16 dBm 1165 AS923MHz end-devices SHALL feature a channel data structure to store the parameters of 1166 at least 16 channels. A channel data structure corresponds to a frequency and a set of data 1167 rates usable on this frequency. 1168 The following table gives the list of frequencies that SHALL be used by end-devices to 1169 broadcast the JoinReq message. 1170 Modulation Bandwidth [kHz] Channel Frequency [MHz] FSK Bitrate or LoRa DR / Bitrate Nb Channels Duty cycle LoRa 125 923.20 923.40 DR2 to DR5 2 < 1% Table 50: AS923 JoinReq Channel List 1171 1172 The default JoinReq Data Rate utilizes the range DR2-DR5 (SF10/125 kHz – SF7/125 kHz), 1173 this setting ensures that end-devices are compatible with the 400ms dwell time limitation until 1174 the actual dwell time limit is notified to the end-device by the network server via the MAC 1175 command "TxParamSetupReq". 1176 The JoinReq message transmit duty-cycle SHALL follow the rules described in chapter 1177

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