3.1 Uplink Messages
- Uplink messages are sent by end-devices to the network server relayed by one or many
- gateways.
- Uplink messages use the LoRa radio packet explicit mode in which the LoRa physical
- header (PHDR) plus a header CRC (PHDR_CRC) are included.1 The integrity of the payload
- is protected by a CRC.
- The PHDR, PHDR_CRC and payload CRC fields are inserted by the radio transceiver.
- Uplink PHY:
| Preamble | PHDR | PHDR_CRC | PHYPayload | CRC | |
|---|---|---|---|---|---|
| 11 | |||||
| Figure 2: Uplink PHY structure |