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LoRaWAN 1.0.2 Regional Parameters ©2017 LoRa Alliance™ Page 46 of 55 The authors reserve the right to change specifications without notice. 2.8.6 KR920-923 Maximum payload size 1209 The maximum MACPayload size length (M) is given by the following table for the regulation 1210 of dwell time; less than 4 sec with LBT. It is derived from limitation of the PHY layer 1211 depending on the effective modulation rate used taking into account a possible repeater 1212 encapsulation layer. The maximum application payload length in the absence of the optional 1213 FOpt control field (N) is also given for information only. The value of N might be smaller if 1214 the FOpt field is not empty: 1215 1216 DataRate M N 0 59 51 1 59 51 2 59 51 3 123 115 4 230 222 5 230 222 6:15 Not defined Table 62: KR920-923 maximum payload size 1217 If the end-device will never operate with a repeater then the maximum application payload 1218 length in the absence of the optional FOpt control field should be: 1219 1220 DataRate M N 0 59 51 1 59 51 2 59 51 3 123 115 4 250 242 5 250 242 6:15 Not defined Table 63 : KR920-923 maximum payload size (not repeater compatible) 1221 1222 2.8.7 KR920-923 Receive windows 1223 The RX1 receive window uses the same channel than the preceding uplink. The data rate is 1224 a function of the uplink data rate and the RX1DROffset as given by the following table. The 1225 allowed values for RX1DROffset are in the [0:5] range. Values in the [6:7] range are 1226 reserved for future use. 1227 1228 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 DR3 DR3 DR2 DR1 DR0 DR0 DR0 DR4 DR4 DR3 DR2 DR1 DR0 DR0 DR5 DR5 DR4 DR3 DR2 DR1 DR0 Table 64 : KR920-923 downlink RX1 data rate mapping 1229 The RX2 receive window uses a fixed frequency and data rate. The default parameters are 1230 921.90MHz / DR0 (SF12, 125 kHz). 1231