Issue link: https://read.uberflip.com/i/1428359
LoRaWAN 1.0.3 Regional Parameters ©2018 LoRa™ Alliance Page 53 of 71 The authors reserve the right to change specifications without notice. 2.9 KR920-923MHz ISM Band 1273 2.9.1 KR920-923 Preamble Format 1274 The following synchronization words SHOULD be used: 1275 1276 Modulation Sync word Preamble length LORA 0x34 8 symbols 2.9.2 KR920-923 ISM Band channel frequencies 1277 The center frequency, bandwidth and maximum EIRP output power for the South Korea 1278 RFID/USN frequency band are already defined by Korean Government. Basically Korean 1279 Government allocated LPWA based IoT network frequency band from 920.9 to 923.3MHz. 1280 1281 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 57: KR920-923 Center frequency, bandwidth, maximum EIRP output power table 1282 The three following default channels (922.1, 922.3 and 922.5MHz / DR0 to DR5) determined 1283 by the network operator from the set of available channels as defined by the South Korean 1284 regulation MUST be implemented in every KR920-923MHz end-device, and cannot be 1285 alterable by the NewChannelReq command. Those channels are the minimum set that all 1286 network gateways SHOULD always be listening on to guarantee a minimal common channel 1287 set between end-devices and network gateways. 1288 1289 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 58: KR920-923 default channels 1290 In order to access the physical medium the South Korea regulations impose some restrictions. 1291 The South Korea regulations allow the choice of using either a duty-cycle limitation or a so- 1292 called Listen Before Talk Adaptive Frequency Agility (LBT AFA) transmissions management. 1293 The current LoRaWAN specification for the KR920-923 ISM band exclusively uses LBT 1294 channel access rule to maximize MACPayload size length and comply with the South Korea 1295 regulations. 1296