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TS001-1.0.4 LoRaWAN® L2 1.0.4 Specification

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LoRaWAN ® L2 1.0.4 Specification © 2020 LoRa Alliance ® Page 16 of 90 The authors reserve the right to change specifications without notice. 4.2 MAC Header (MHDR field) 459 460 Bits [7:5] [4:2] [1:0] MHDR FType RFU Major Table 3: MHDR format 461 462 463 The MAC header specifies the frame type (FType) and the Major version (Major) of the 464 frame format of the LoRaWAN layer specification according to which the frame has been 465 encoded. 466 4.2.1 Frame types (FType bit field) 467 The LoRaWAN distinguishes among six different MAC frame types: Join-Request, Join- 468 Accept, unconfirmed data uplink / downlink, and confirmed data uplink / downlink. 469 470 FType Description 000 Join-Request 001 Join-Accept 010 unconfirmed data uplink 011 unconfirmed data downlink 100 confirmed data uplink 101 confirmed data downlink 110 RFU 111 Proprietary Table 4: MAC frame types 471 4.2.1.1 Join-Request and Join-Accept frames 472 Join-Request and Join-Accept frames are used by the over-the-air activation procedure 473 described in Section 6.2. 474 4.2.1.2 Data frames 475 Data frames transfer MAC commands and application data, which can be combined into a 476 single frame. A confirmed data frame SHALL be acknowledged by the receiver, whereas an 477 unconfirmed data frame SHALL NOT be acknowledged. 5 Proprietary frames MAY be used 478 to implement non-standard formats that are not interoperable with standard frames but SHALL 479 be used only among end-devices that have a common understanding of the proprietary 480 extensions. 481 Frame integrity is ensured in different ways for different frame types and is described per frame 482 type below. 483 5 A detailed timing diagram of the acknowledge mechanism is shown in Section 16.

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