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LoRaWAN Specification ©2015 LoRa™ Alliance Page 4 of 82 The authors reserve the right to change specifications without notice. 7 Physical Layer ........................................................................................................... 34 1 7.1 EU 863-870MHz ISM Band .................................................................................... 34 2 7.1.1 EU863-870 Preamble Format ........................................................................... 34 3 7.1.2 EU863-870 ISM Band channel frequencies ...................................................... 34 4 7.1.3 EU863-870 Data Rate and End-point Output Power encoding ......................... 35 5 7.1.4 EU863-870 JoinAccept CFList .......................................................................... 35 6 7.1.5 EU863-870 LinkAdrReq command ................................................................... 36 7 7.1.6 EU863-870 Maximum payload size .................................................................. 36 8 7.1.7 EU863-870 Receive windows ........................................................................... 37 9 7.1.8 EU863-870 Default Settings ............................................................................. 37 10 7.2 US 902-928MHz ISM Band .................................................................................... 39 11 7.2.1 US902-928 Preamble Format ........................................................................... 39 12 7.2.2 US902-928 Channel Frequencies .................................................................... 39 13 7.2.3 US902-928 Data Rate and End-point Output Power encoding ......................... 39 14 7.2.4 US902-928 JoinResp CFList ............................................................................ 40 15 7.2.5 US902-928 LinkAdrReq command ................................................................... 40 16 7.2.6 US902-928 Maximum payload size .................................................................. 41 17 7.2.7 US902-928 Receive windows ........................................................................... 42 18 7.2.8 US902-928 Default Settings ............................................................................. 42 19 7.3 China 779-787MHz ISM Band ................................................................................ 43 20 7.3.1 CN779-787 Preamble Format ........................................................................... 43 21 7.3.2 CN779-787 ISM Band channel frequencies ...................................................... 43 22 7.3.3 CN779-787 Data Rate and End-point Output Power encoding ........................ 44 23 7.3.4 CN779-787 JoinAccept CFList ........................................................................ 44 24 7.3.5 CN779-787 LinkAdrReq command .................................................................. 45 25 7.3.6 CN779-787 Maximum payload size ................................................................. 45 26 7.3.7 CN779-787 Receive windows ........................................................................... 46 27 7.3.8 CN779-787 Default Settings ............................................................................ 46 28 7.4 EU 433MHz ISM Band ........................................................................................... 47 29 7.4.1 EU433 Preamble Format .................................................................................. 47 30 7.4.2 EU433 ISM Band channel frequencies ............................................................. 47 31 7.4.3 EU433 Data Rate and End-point Output Power encoding ................................ 48 32 7.4.4 EU433 JoinAccept CFList ................................................................................. 48 33 7.4.5 EU433 LinkAdrReq command .......................................................................... 49 34 7.4.6 EU433 Maximum payload size ......................................................................... 49 35 7.4.7 EU433 Receive windows .................................................................................. 50 36 7.4.8 EU433 Default Settings .................................................................................... 50 37 Class B – Beacon ............................................................................................................... 51 38 8 Introduction to Class B ............................................................................................... 52 39 9 Principle of synchronous network initiated downlink (Class-B option) ......................... 53 40 10 Uplink frame in Class B mode .................................................................................... 55 41 11 Downlink Ping frame format (Class B option) ............................................................. 56 42 11.1 Physical frame format ............................................................................................ 56 43 11.2 Unicast & Multicast MAC messages ....................................................................... 56 44 11.2.1 Unicast MAC message format .......................................................................... 56 45 11.2.2 Multicast MAC message format ........................................................................ 56 46 12 Beacon acquisition and tracking ................................................................................. 57 47 12.1 Minimal beacon-less operation time ....................................................................... 57 48 12.2 Extension of beacon-less operation upon reception ............................................... 57 49 12.3 Minimizing timing drift ............................................................................................. 57 50 13 Class B Downlink slot timing ...................................................................................... 58 51 13.1 Definitions .............................................................................................................. 58 52 13.2 Slot randomization ................................................................................................. 59 53

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