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LoRaWAN 1.0.2 Regional Parameters ©2017 LoRa Alliance™ Page 8 of 55 The authors reserve the right to change specifications without notice. 2 LoRaWAN Regional Parameters 256 2.1 EU 863-870MHz ISM Band 257 2.1.1 EU863-870 Preamble Format 258 The following synchronization words should be used: 259 260 Modulation Sync word Preamble length LORA 0x34 8 symbols GFSK 0xC194C1 5 bytes Table 1: EU863-870 synch words 261 2.1.2 EU863-870 ISM Band channel frequencies 262 This section applies to any region where the ISM radio spectrum use is defined by the ETSI 263 [EN300.220] standard. 264 The network channels can be freely attributed by the network operator. However the three 265 following default channels must be implemented in every EU868MHz end-device. Those 266 channels are the minimum set that all network gateways should always be listening on. 267 268 Modulation Bandwidth [kHz] Channel Frequency [MHz] FSK Bitrate or LoRa DR / Bitrate Nb Channels Duty cycle LoRa 125 868.10 868.30 868.50 DR0 to DR5 / 0.3-5 kbps 3 <1% Table 2: EU863-870 default channels 269 In order to access the physical medium the ETSI regulations impose some restrictions such 270 maximum time the transmitter can be on or the maximum time a transmitter can transmit per 271 hour. The ETSI regulations allow the choice of using either a duty-cycle limitation or a so- 272 called Listen Before Talk Adaptive Frequency Agility (LBT AFA) transmissions 273 management. The current LoRaWAN specification exclusively uses duty-cycled limited 274 transmissions to comply with the ETSI regulations. 275 EU868MHz end-devices should be capable of operating in the 863 to 870 MHz frequency 276 band and should feature a channel data structure to store the parameters of at least 16 277 channels. A channel data structure corresponds to a frequency and a set of data rates 278 usable on this frequency. 279 The first three channels correspond to 868.1, 868.3, and 868.5 MHz / DR0 to DR5 and must 280 be implemented in every end-device. Those default channels cannot be modified through 281 the NewChannelReq command and guarantee a minimal common channel set between 282 end-devices and network gateways. 283 The following table gives the list of frequencies that should be used by end-devices to 284 broadcast the JoinReq message. The JoinReq message transmit duty-cycle shall follow the 285 rules described in chapter "Retransmissions back-off" of the LoRaWAN specification 286 document. 287 288