Document

LoRaWAN Regional Parameters ©2016 LoRa™ Alliance Page 36 of 45 The authors reserve the right to change specifications without notice. 1 2.7.4 AS923 JoinAccept CFList 2 The AS923 LoRaWAN implements an optional channel frequency list (CFlist) of 16 octets in 3 the JoinAccept message. 4 In this case the CFList is a list of five channel frequencies for the channels three to seven 5 whereby each frequency is encoded as a 24 bits unsigned integer (three octets). All these 6 channels are usable for DR0 to DR5 125 KHz LoRa modulation. 7 Size (bytes) 3 3 3 3 3 1 CFList Freq Ch3 Freq Ch4 Freq Ch5 Freq Ch6 Freq Ch7 RFU The actual channel frequency in Hz is 100 x frequency whereby values representing 8 frequencies below 100 MHz are reserved for future use. This allows setting the frequency of 9 a channel anywhere between 915 and 928MHz in 100 Hz steps. Unused channels have a 10 frequency value of 0. The CFList is optional and its presence can be detected by the length 11 of the join-accept message. If present, the CFList replaces all the previous channels stored 12 in the end-device apart from the two default channels as defined in Chapter 1.7.2. The newly 13 defined channels are immediately enabled and usable by the end-device for communication. 14 2.7.5 AS923 LinkAdrReq command 15 The AS923 LoRaWAN only supports a maximum of 16 channels. When ChMaskCntl field is 16 0 the ChMask field individually enables/disables each of the 16 channels. 17 18 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 43: ChMaskCntl value table 19 If the ChMask field value is one of values meaning RFU, the end-device should reject the 20 command and unset the "Channel mask ACK" bit in its response. 21 22 2.7.6 AS923 Maximum payload size 23 The maximum MACPayload size length (M) is given by the following table for both dwell 24 time configurations: No Limit and 400ms. It is derived from the PHY layer limitation 25 depending on the effective modulation rate used taking into account a possible repeater 26 encapsulation layer. 27 28 DataRate Uplink MAC Payload Size (M) Downlink MAC Payload Size (M)

• Cover