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LoRaWAN ® Fragmented Data Block Transport Specification TS004-2.0.0 ©2022 LoRa Alliance ® Page 19 of 32 The authors reserve the right to change specifications without notice. 5 Fragmentation Algorithms 531 532 The following sections contain a description of the fragmentation / coding / decoding / 533 defragmentation algorithm proposed. 534 535 The coding adds some redundancy to the fragment transmitted so that an end-device 536 missing some of the fragments can still reconstruct the complete data block. 537 538 The maximum ratio of lost fragments that can be tolerated is a parameter selected by the 539 "fragmentation server" preparing the delivery. 540 541 FragAlgo Section 0 Data block fragmentation forward error correction code 1 to 7 RFU Table 25: Fragmentation algorithms definition references 542

• Cover
• 1 Conventions
• 2 Introduction
• 2.1 Definitions
• 3 Fragmented Data Block Transport Package
• 3.1 Package Version Commands (PackageVersionReq, PackageVersionAns)
• 3.2 Fragmentation Session Status Commands (FragSessionStatusReq, FragSessionStatusAns)
• 3.3 Fragmentation Session Setup Commands (FragSessionSetupReq, FragSessionSetupAns)
• 3.4 Fragmentation Session Delete Commands (FragSessionDeleteReq, FragSessionDeleteAns)
• 3.5 Fragmentation Data Block Received Commands (FragDataBlockReceivedReq, FragDataBlockReceivedAns)
• 3.6 Data Fragment Message (DataFragment)
• 4 Data Block Integrity Check and Authentication
• 5 Fragmentation Algorithms
• 6 Revisions
• 6.1 Revision 1.0.0
• 6.2 Revision 2.0.0
• 7 Glossary
• 8 Bibliography
• 8.1 References
• APPENDIX: Data Block Fragmentation Forward Error Correction Code
• A.1 Fragment Error Coding
• A.2 Fragment Decoding and Reassembly
• A.3 Performance of the Coding Scheme
• A.4 End-Device Memory Requirement
• A.5 Preliminary MATLAB Code