Issue link: https://read.uberflip.com/i/1540208
Regional Parameters RP002-1.0.5 ©2022-2025 LoRa Alliance ® Page 83 of 116 The authors reserve the right to change specifications without notice. 3.11 KR920-923 MHz Band 1684 3.11.1 KR920-923 Preamble Format 1685 Refer to Section 5, "Physical Layer". 1686 3.11.2 KR920-923 Band Channel Frequencies 1687 The center frequency, bandwidth, and maximum EIRP output power for the South Korea 1688 RFID/USN frequency band are defined by the Korean Government, which has allocated 1689 LPWA-based IoT networks the channel center frequencies from 920.9 to 923.3 MHz. 1690 1691 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 77: KR920-923 center frequency, bandwidth, maximum EIRP output power 1692 The three default channels correspond to 922.1, 922.3, and 922.5 MHz / DR0 to DR5 and 1693 SHALL be implemented in every KR920-923 end-device. For devices compliant with [TS001- 1694 1.0.x], those default channels SHALL NOT be modified through the NewChannelReq 1695 command. For devices compliant with [TS001-1.1.x] and beyond, these channels MAY be 1696 modified through the NewChannelReq command but SHALL be reset during the back-off 1697 procedure defined in [TS001] to guarantee a minimal common channel set between end- 1698 devices and network gateways. 1699 The following table gives the list of frequencies that SHALL be used by end-devices to 1700 broadcast the Join-Request message. The Join-Request message transmit duty-cycle SHALL 1701 follow the rules described in chapter "Retransmissions back-off" of the LoRaWAN [TS001] 1702 specification document. 1703 Modulation Bandwidth [kHz] Channel Frequency [MHz] LoRa DR / Bitrate Number of Channels LoRa 125 922.10 922.30 922.50 DR0 to DR5 / 0.3-5 kbps 3 Table 78: KR920-923 default channels 1704 In order to access the physical medium, the South Korea regulations impose several 1705 restrictions. The South Korea regulations allow the choice of using either a duty-cycle 1706 limitation or Listen Before Talk Adaptive Frequency Agility (LBT AFA) transmission 1707 management. The current LoRaWAN specification for the KR920-923 band exclusively uses 1708 the LBT channel access rule to maximize MACPayload size length and comply with the South 1709 Korea regulations. 1710