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LoRaWAN Regional Parameters ©2016 LoRa™ Alliance Page 41 of 45 The authors reserve the right to change specifications without notice. 2.8.5 KR920-923 LinkAdrReq command 1 The KR920-923 LoRaWAN only supports a maximum of 16 channels. When ChMaskCntl 2 field is 0 the ChMask field individually enables/disables each of the 16 channels. 3 4 ChMaskCntl ChMask applies to 0 Channels 1 to 16 1 RFU .. .. 4 RFU 5 RFU 6 All channels ON The device should enable all currently defined channels independently of the ChMask field value. 7 RFU Table 52: ChMaskCntl value table 5 If the ChMaskCntl field value is one of values meaning RFU, the end-device should reject 6 the command and unset the "Channel mask ACK" bit in its response. 7 2.8.6 KR920-923 Maximum payload size 8 The maximum MACPayload size length (M) is given by the following table for the regulation 9 of dwell time; less than 4 sec with LBT. It is derived from limitation of the PHY layer 10 depending on the effective modulation rate used taking into account a possible repeater 11 encapsulation layer. The maximum application payload length in the absence of the optional 12 FOpt control field (N) is also given for information only. The value of N might be smaller if 13 the FOpt field is not empty: 14 15 DataRate M N 0 73 65 1 159 151 2 250 242 3 250 242 4 250 242 5 250 242 6:15 Not defined Table 53: KR920-923 maximum payload size 16 2.8.7 KR920-923 Receive windows 17 The RX1 receive window uses the same channel than the preceding uplink. The data rate is 18 a function of the uplink data rate and the RX1DROffset as given by the following table. The 19 allowed values for RX1DROffset are in the [0:5] range. Values in the [6:7] range are 20 reserved for future use. 21 22 RX1DROffset 0 1 2 3 4 5 Upstream data rate Downstream data rate in RX1 slot DR0 DR0 DR0 DR0 DR0 DR0 DR0 DR1 DR1 DR0 DR0 DR0 DR0 DR0 DR2 DR2 DR1 DR0 DR0 DR0 DR0

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