Issue link: https://read.uberflip.com/i/1428395
LoRaWAN ® L2 1.0.4 Specification © 2020 LoRa Alliance ® Page 4 of 90 The authors reserve the right to change specifications without notice. 6.3 Activation by Personalization ................................................................................. 48 124 7 Retransmissions Backoff ............................................................................................ 49 125 Class B – Beacon ............................................................................................................... 50 126 8 Introduction to Class B ............................................................................................... 51 127 8.1 Principle of Synchronous Network-initiated Class B Downlinks .............................. 51 128 9 Class B Frame Formats ............................................................................................. 54 129 9.1 Uplink Frames ........................................................................................................ 54 130 9.2 Downlink Frames ................................................................................................... 54 131 9.3 Downlink Ping Frames ........................................................................................... 54 132 9.3.1 Unicast downlink ping frame format .................................................................. 55 133 9.3.2 Multicast downlink ping frame format ................................................................ 56 134 10 Class B Beacon Acquisition and Tracking .................................................................. 57 135 10.1 Minimal Beaconless Operation Time ...................................................................... 57 136 10.2 Extension of Beaconless Operation upon Receipt .................................................. 57 137 10.3 Minimizing Timing Drift ........................................................................................... 58 138 11 Class B Downlink Slot Timing .................................................................................... 59 139 11.1 Definitions .............................................................................................................. 59 140 11.2 Slot Randomization ................................................................................................ 60 141 12 Class B MAC Commands .......................................................................................... 62 142 12.1 PingSlotInfoReq ..................................................................................................... 62 143 12.2 BeaconFreqReq ..................................................................................................... 63 144 12.3 PingSlotChannelReq .............................................................................................. 64 145 12.4 BeaconTimingReq and BeaconTimingAns ............................................................. 66 146 13 Class B Beaconing ..................................................................................................... 67 147 13.1 Beacon Physical Layer ........................................................................................... 67 148 13.2 Beacon Frame Format ........................................................................................... 67 149 13.3 Beacon GwSpecific Field Format ........................................................................ 68 150 13.3.1 Gateway GPS coordinate: InfoDesc=0, 1 or 2 .......................................... 69 151 13.3.2 NetID + GatewayID ....................................................................................... 69 152 13.4 Beacon Encoding Examples .................................................................................. 70 153 13.5 Beaconing Precise Timing ...................................................................................... 70 154 13.6 Network Downlink Route Update Requirements ..................................................... 72 155 14 Class B Unicast and Multicast Downlink Channel Frequencies .................................. 73 156 14.1 Single-Channel Beacon Transmission .................................................................... 73 157 14.2 Frequency-Hopping Beacon Transmission ............................................................. 73 158 Class C – Continuously listening ......................................................................................... 74 159 15 Continuously Listening End-Device (Class C) ............................................................ 75 160 15.1 Class C Multicast Downlinks .................................................................................. 77 161 Support information ............................................................................................................. 78 162 16 Informative Examples ................................................................................................ 79 163 16.1 Uplink Timing Diagram for Unconfirmed Data Frames ........................................... 79 164 16.2 Uplink Timing Diagram for Confirmed Data Frames ............................................... 80 165 16.3 Downlink Diagram for Confirmed Data Frames ...................................................... 81 166 16.4 Downlink Timing for Frame-Pending Frames ......................................................... 82 167 17 Revisions ................................................................................................................... 85 168 17.1 Revision 1.0 ........................................................................................................... 85 169 17.2 Revision 1.0.1 ........................................................................................................ 85 170 17.3 Revision 1.0.2 ........................................................................................................ 85 171 17.4 Revision 1.0.3 ........................................................................................................ 86 172 17.5 Revision 1.0.4 ........................................................................................................ 86 173 18 Glossary .................................................................................................................... 88 174 19 Bibliography ............................................................................................................... 89 175