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LoRaWAN ® IPv6 Adaptation Layer Specification TS010-1.0.0 ©2022 LoRa Alliance ® Page 6 of 15 The authors reserve the right to change specifications without notice. 3 SCHC as an Adaptation Layer for IPv6 over LoRaWAN 131 LoRaWAN end-devices compliant with this specification SHALL implement the SCHC 132 specifications per [RFC9011, RFC8724], and SHALL conform to the LoRaWAN Layer 2 133 specification in [TS001] to implement IPv6-based applications. 134 Note: The generic mechanisms of SCHC are specified in [RFC8724] 135 while parameters for LoRaWAN communications are specified in 136 [RFC9011]. 137 SCHC operates on a point-to-point logical link between two SCHC entities. Within the context 138 of LoRaWAN, these two entities are considered application-layer (see Figure 1) and consist 139 of: 140 • The SCHC protocol implemented in the application layer of the end-device. 141 • The SCHC protocol implemented as a SCHC gateway northbound of the LoRaWAN 142 Application Server. 143 144 For downlink multicast, SCHC operates on the unidirectional link between the SCHC layer of 145 the SCHC gateway and the SCHC layer of the end-devices belonging to the multicast group. 146 147 Each transmitted message starts with the identifier of the SCHC rule (called RuleID) that 148 yielded that message. 149 150 A set of rules, referred to as a "context", is specific to the end-device/SCHC gateway pair. This 151 context needs to be provisioned into the end-device and into the SCHC gateway before the 152 SCHC communication can start. The manner in which this context is provisioned is out of 153 scope for this document. 154 155 156 Figure 1: SCHC is the next layer above LoRaWAN layers 157