Issue link: https://read.uberflip.com/i/1428383
LoRaWAN 1.0.3 Specification ©2018 LoRa™ Alliance Page 4 of 72 The authors reserve the right to change specifications without notice. 6.3 Activation by Personalization ..................................................................................... 37 117 7 Retransmissions back-off ............................................................................................... 38 118 Class B – Beacon .................................................................................................................... 39 119 8 Introduction to Class B ................................................................................................... 40 120 9 Principle of synchronous network initiated downlink (Class-B option) .......................... 41 121 10 Uplink frame in Class B mode ........................................................................................ 43 122 11 Downlink Ping frame format (Class B option) ................................................................ 44 123 11.1 Physical frame format ................................................................................................. 44 124 11.2 Unicast & Multicast MAC messages .......................................................................... 44 125 11.2.1 Unicast MAC message format.............................................................................. 44 126 11.2.2 Multicast MAC message format ........................................................................... 44 127 12 Beacon acquisition and tracking .................................................................................... 45 128 12.1 Minimal beacon-less operation time .......................................................................... 45 129 12.2 Extension of beacon-less operation upon reception.................................................. 45 130 12.3 Minimizing timing drift ................................................................................................. 45 131 13 Class B Downlink slot timing .......................................................................................... 47 132 13.1 Definitions ................................................................................................................... 47 133 13.2 Slot randomization ...................................................................................................... 48 134 14 Class B MAC commands ............................................................................................... 49 135 14.1 PingSlotInfoReq .......................................................................................................... 49 136 14.2 BeaconFreqReq ......................................................................................................... 50 137 14.3 PingSlotChannelReq .................................................................................................. 51 138 14.4 BeaconTimingReq & BeaconTimingAns .................................................................... 52 139 15 Beaconing (Class B option) ............................................................................................ 53 140 15.1 Beacon physical layer ................................................................................................ 53 141 15.2 Beacon frame content ................................................................................................ 53 142 15.3 Beacon GwSpecific field format ................................................................................. 54 143 15.3.1 Gateway GPS coordinate:InfoDesc = 0, 1 or 2 .................................................... 55 144 15.3.2 NetID+GatewayID................................................................................................. 55 145 15.4 Beaconing precise timing ........................................................................................... 55 146 15.5 Network downlink route update requirements ........................................................... 56 147 16 Class B unicast & multicast downlink channel frequencies ........................................... 57 148 16.1 Single channel beacon transmission ......................................................................... 57 149 16.2 Frequency-hopping beacon transmission .................................................................. 57 150 Class C – Continuously listening ............................................................................................. 58 151 17 Class C: Continuously listening end-device ................................................................... 59 152 17.1 Second receive window duration for Class C ............................................................ 59 153 17.2 Class C Multicast downlinks ....................................................................................... 60 154 Support information.................................................................................................................. 61 155 18 Examples and Application Information........................................................................... 62 156 18.1 Uplink Timing Diagram for Confirmed Data Messages ............................................. 62 157 18.2 Downlink Diagram for Confirmed Data Messages ..................................................... 62 158 18.3 Downlink Timing for Frame-Pending Messages ........................................................ 63 159 18.4 Data-Rate Adaptation during Message Retransmissions .......................................... 64 160 19 Recommendation on contract to be provided to the network server by the end- 161 device provider at the time of provisioning .............................................................................. 66 162 20 Recommendation on finding the locally used channels ................................................ 67 163 21 Revisions ........................................................................................................................ 68 164 21.1 Revision 1.0 ................................................................................................................ 68 165 21.2 Revision 1.0.1 ............................................................................................................. 68 166 21.3 Revision 1.0.2 ............................................................................................................. 68 167 21.4 Revision 1.0.3 ............................................................................................................. 69 168 22 Glossary .......................................................................................................................... 70 169