LoRaWAN® Regional Parameters v1.0.3revA

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LoRaWAN 1.0.3 Regional Parameters ©2018 LoRa™ Alliance Page 50 of 71 The authors reserve the right to change specifications without notice. 2.8.4 AS923 JoinAccept CFList 1199 The AS923 LoRaWAN implements an optional channel frequency list (CFlist) of 16 octets in 1200 the JoinAccept message. 1201 In this case the CFList is a list of five channel frequencies for the channels two to six whereby 1202 each frequency is encoded as a 24 bits unsigned integer (three octets). All these channels are 1203 usable for DR0 to DR5 125 KHz LoRa modulation. The list of frequencies is followed by a 1204 single CFListType octet for a total of 16 octets. The CFListType SHALL be equal to zero (0) 1205 to indicate that the CFList contains a list of frequencies. 1206 1207 Size (bytes) 3 3 3 3 3 1 CFList Freq Ch2 Freq Ch3 Freq Ch4 Freq Ch5 Freq Ch6 CFListType The actual channel frequency in Hz is 100 x frequency whereby values representing 1208 frequencies below 100 MHz are reserved for future use. This allows setting the frequency of 1209 a channel anywhere between 915 and 928MHz in 100 Hz steps. Unused channels have a 1210 frequency value of 0. The CFList is optional and its presence can be detected by the length of 1211 the join-accept message. If present, the CFList replaces all the previous channels stored in 1212 the end-device apart from the two default channels. The newly defined channels are 1213 immediately enabled and usable by the end-device for communication. 1214 2.8.5 AS923 LinkAdrReq command 1215 The AS923 LoRaWAN only supports a maximum of 16 channels. When ChMaskCntl field is 1216 0 the ChMask field individually enables/disables each of the 16 channels. 1217 1218 ChMaskCntl ChMask applies to 0 Channels 0 to 15 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 53: AS923 ChMaskCntl value table 1219 If the ChMask field value is one of values meaning RFU, the end-device SHOULD reject the 1220 command and unset the "Channel mask ACK" bit in its response. 1221 1222 2.8.6 AS923 Maximum payload size 1223 The maximum MACPayload size length (M) is given by the following table for both dwell time 1224 configurations: No Limit and 400ms. It is derived from the PHY layer limitation depending on 1225 the effective modulation rate used taking into account a possible repeater encapsulation layer. 1226 1227 DataRate Uplink MAC Payload Size (M) Downlink MAC Payload Size (M)

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