Document

Enabling CSMA for LoRaWAN TR013-1.0.0 ©2023 LoRa Alliance ® Page 3 of 18 The authors reserve the right to change specifications without notice. Contents 66 1 Conventions ................................................................................................................. 4 67 2 Introduction .................................................................................................................. 5 68 3 Enabling Carrier Sense in LoRa Radios ....................................................................... 6 69 4 CSMA Protocol for LoRaWAN...................................................................................... 7 70 4.1 Rationale .................................................................................................................. 7 71 4.2 State Transitions ...................................................................................................... 9 72 4.2.1 State Transitions of an End-Device Adopting DIFS without BO .......................... 9 73 4.2.2 State Transitions of an End-Device Adopting DIFS with BO ............................. 10 74 4.3 Recommended Parameters ................................................................................... 12 75 5 Global Regulatory Compliance................................................................................... 13 76 5.1 Region with Listen Before Talk ............................................................................... 13 77 5.2 Regions with Mandatory Equal Channel Utilization ................................................ 13 78 6 Glossary .................................................................................................................... 14 79 7 Bibliography ............................................................................................................... 15 80 7.1 References............................................................................................................. 15 81 APPENDIX 1: CAD Configuration ....................................................................................... 16 82 APPENDIX 2: CAD Energy Overhead ................................................................................. 17 83 84 Tables 85 Table 1: Summary of parameters ........................................................................................ 12 86 Table 2: Optimal CAD settings for the SX1262 for 2 symbols .............................................. 16 87 Table 3: SX1262 CAD energy consumption (optimized for best detection) .......................... 17 88 Table 4: Transmission characteristics of SX1262 under (868/915 MHz) band ..................... 17 89 Table 5: CSMA overhead for three different transmission power levels ............................... 18 90 91 Figures 92 Figure 1: LoRaWAN CSMA state transition diagram ............................................................. 9 93 Figure 2: Two nodes contending for the same CH/SF combination ..................................... 11 94 95

• Cover