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LoRaWAN 1.0.2 Regional Parameters ©2017 LoRa Alliance™ Page 43 of 55 The authors reserve the right to change specifications without notice. 2.8 South Korea 920-923MHz ISM Band 1131 2.8.1 KR920-923 Preamble Format 1132 The following synchronization words should be used: 1133 1134 Modulation Sync word Preamble length LORA 0x34 8 symbols 2.8.2 KR920-923 ISM Band channel frequencies 1135 The center frequency, bandwidth and maximum EIRP output power for the South Korea 1136 RFID/USN frequency band are already defined by Korean Government. Basically Korean 1137 Government allocated LPWA based IoT network frequency band from 920.9 to 923.3MHz. 1138 1139 Center frequency (MHz) Bandwidth (kHz) Maximum EIRP output power (dBm) For end-device For gateway 920.9 125 10 23 921.1 125 10 23 921.3 125 10 23 921.5 125 10 23 921.7 125 10 23 921.9 125 10 23 922.1 125 14 23 922.3 125 14 23 922.5 125 14 23 922.7 125 14 23 922.9 125 14 23 923.1 125 14 23 923.3 125 14 23 Table 56: Center frequency, bandwidth, maximum EIRP output power table 1140 The three following default channels (922.1, 922.3 and 922.5MHz / DR0 to DR5) determined 1141 by the network operator from the set of available channels as defined by the South Korean 1142 regulation must be implemented in every KR920-923MHz end-device, and cannot be 1143 alterable by the NewChannelReq command. Those channels are the minimum set that all 1144 network gateways should always be listening on to guarantee a minimal common channel 1145 set between end-devices and network gateways. 1146 1147 Modulation Bandwidth [kHz] Channel Frequency [MHz] FSK Bitrate or LoRa DR / Bitrate Nb Channels LoRa 125 922.10 922.30 922.50 DR0 to DR5 / 0.3-5 kbps 3 Table 57: KR920-923 default channels 1148 In order to access the physical medium the South Korea regulations impose some 1149 restrictions. The South Korea regulations allow the choice of using either a duty-cycle 1150 limitation or a so-called Listen Before Talk Adaptive Frequency Agility (LBT AFA) 1151 transmissions management. The current LoRaWAN specification for the KR920-923 ISM 1152