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LoRaWAN Specification ©2016 LoRa™ Alliance Page 4 of 70 The authors reserve the right to change specifications without notice. 6.2.5 Join-accept message........................................................................................ 33 1 6.3 Activation by Personalization ................................................................................. 35 2 7 Retransmissions back-off ........................................................................................... 36 3 Class B – Beacon ............................................................................................................... 37 4 8 Introduction to Class B ............................................................................................... 38 5 9 Principle of synchronous network initiated downlink (Class-B option) ......................... 39 6 10 Uplink frame in Class B mode .................................................................................... 41 7 11 Downlink Ping frame format (Class B option) ............................................................. 42 8 11.1 Physical frame format ............................................................................................ 42 9 11.2 Unicast & Multicast MAC messages ....................................................................... 42 10 11.2.1 Unicast MAC message format .......................................................................... 42 11 11.2.2 Multicast MAC message format ........................................................................ 42 12 12 Beacon acquisition and tracking ................................................................................. 43 13 12.1 Minimal beacon-less operation time ....................................................................... 43 14 12.2 Extension of beacon-less operation upon reception ............................................... 43 15 12.3 Minimizing timing drift ............................................................................................. 43 16 13 Class B Downlink slot timing ...................................................................................... 44 17 13.1 Definitions .............................................................................................................. 44 18 13.2 Slot randomization ................................................................................................. 45 19 14 Class B MAC commands ........................................................................................... 46 20 14.1 PingSlotInfoReq ..................................................................................................... 46 21 14.2 BeaconFreqReq ..................................................................................................... 47 22 14.3 PingSlotChannelReq .............................................................................................. 47 23 14.4 BeaconTimingReq .................................................................................................. 48 24 14.5 BeaconTimingAns .................................................................................................. 49 25 15 Beaconing (Class B option) ........................................................................................ 50 26 15.1 Beacon physical layer ............................................................................................ 50 27 15.1.1 EU 863-870MHz ISM Band .............................................................................. 50 28 15.1.2 US 902-928MHz ISM Band .............................................................................. 50 29 15.2 Beacon frame content ............................................................................................ 51 30 15.3 Beacon GwSpecific field format .............................................................................. 52 31 15.3.1 Gateway GPS coordinate:InfoDesc = 0, 1 or 2 ................................................. 53 32 15.4 Beaconing precise timing ....................................................................................... 53 33 15.5 Network downlink route update requirements ......................................................... 53 34 16 Class B unicast & multicast downlink channel frequencies ......................................... 55 35 16.1 EU 863-870MHz ISM Band .................................................................................... 55 36 16.2 US 902-928MHz ISM Band .................................................................................... 55 37 Class C – Continuously listening ......................................................................................... 56 38 17 Class C: Continuously listening end-device................................................................ 57 39 17.1 Second receive window duration for Class C ......................................................... 57 40 17.2 Class C Multicast downlinks ................................................................................... 57 41 Support information ............................................................................................................. 59 42 18 Examples and Application Information ....................................................................... 60 43 18.1 Uplink Timing Diagram for Confirmed Data Messages ........................................... 60 44 18.2 Downlink Diagram for Confirmed Data Messages .................................................. 60 45 18.3 Downlink Timing for Frame-Pending Messages ..................................................... 61 46 18.4 Data-Rate Adaptation during Message Retransmissions........................................ 62 47 19 Recommendation on contract to be provided to the network server by the end- 48 device provider at the time of provisioning .......................................................................... 64 49 20 Recommendation on finding the locally used channels .............................................. 65 50 21 Revisions ................................................................................................................... 66 51 21.1 Revision 1.0 ........................................................................................................... 66 52 21.2 Revision 1.0.1 ........................................................................................................ 66 53

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