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LoRaWAN Regional Parameters ©2016 LoRa™ Alliance Page 37 of 45 The authors reserve the right to change specifications without notice. UplinkDwellTime = 0 UplinkDwellTime = 1 DownlinkDwellTime = 0 DownlinkDwellTime = 1 0 59 N/A 59 N/A 1 59 N/A 59 N/A 2 59 19 59 19 3 123 61 123 61 4 230 133 230 134 5 230 250 230 250 6 230 250 230 250 7 230 250 230 250 8:15 RFU RFU Table 44: AS923 maximum payload size 1 If the end-device will never operate with a repeater then the maximum MAC payload length 2 should be: 3 DataRate Uplink MAC Payload Size (M) Downlink MAC Payload Size (M) UplinkDwellTime = 0 UplinkDwellTime = 1 DownlinkDwellTime = 0 DownlinkDwellTim e = 1 0 59 N/A 59 N/A 1 59 N/A 59 N/A 2 59 19 59 19 3 123 61 123 61 4 250 133 250 134 5 250 250 250 250 6 250 250 250 250 7 250 250 250 250 8:15 RFU RFU Table 45: AS923 maximum payload size (not repeater compatible) 4 The maximum application payload length in the absence of the optional FOpt control field 5 (N) is eight bytes lower than the MACPayload value in the above table. The value of N might 6 be smaller if the FOpt field is not empty. 7 8 2.7.7 AS923 Receive windows 9 The RX1 receive window uses the same channel than the preceding uplink. The data rate is 10 a function of the uplink data rate and the RX1DROffset as following: 11 Downstream data rate in RX1 slot = MIN (5, MAX (MinDR, Upstream data rate – 12 Effective_RX1DROffset)) 13 MinDR depends on the DownlinkDwellTime bit sent to the device in the TxParamSetupReq 14 command: 15 Case DownlinkDwellTime = 0 (No limit): MinDR = 0 16 Case DownlinkDwellTime = 1 (400ms): MinDR = 2 17 The allowed values for RX1DROffset are in the [0:7] range, encoded as per the below table: 18 RX1DROffset (Coded value) 0 1 2 3 4 5 6 7 Effective_RX1DROffset 0 1 2 3 4 5 -1 -2 Values in the [6:7] range allow setting the Downstream RX1 data rate higher than Upstream 19 data rate. 20

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