5 MAC Commands

2 For network administration, a set of MAC commands may be exchanged exclusively

  1. between the network server and the MAC layer on an end-device. MAC layer commands
  2. are never visible to the application or the application server or the application running on the
  3. end-device.
  4. A single data frame can contain any sequence of MAC commands, either piggybacked in the
  5. FOpts field or, when sent as a separate data frame, in the FRMPayload field with the FPort
  6. field being set to 0. Piggybacked MAC commands are always sent without encryption and
  7. must not exceed 15 octets. MAC commands sent as FRMPayload are always encrypted
  8. and must not exceed the maximum FRMPayload length.
11 Note: MAC commands whose content shall not be disclosed to an
12 eavesdropper must be sent in the FRMPayload of a separate data
13 message.
  1. A MAC command consists of a command identifier (CID) of 1 octet followed by a possibly
  2. empty command-specific sequence of octets.

16

CID Command Transmitted by Short Description
End- Gateway
device
0x02 LinkCheckReq x Used by an end-device to validate its
connectivity to a network.
0x02 LinkCheckAns x Answer to LinkCheckReq command.
Contains the received signal power
estimation indicating to the end-device the
quality of reception (link margin).
0x03 LinkADRReq x Requests the end-device to change data
rate, transmit power, repetition rate or
channel.
0x03 LinkADRAns x Acknowledges the LinkRateReq.
0x04 DutyCycleReq x Sets the maximum aggregated transmit
duty-cycle of a device
0x04 DutyCycleAns x Acknowledges a DutyCycleReq command
0x05 RXParamSetupReq x Sets the reception slots parameters
0x05 RXParamSetupAns x Acknowledges a RXSetupReq command
0x06 DevStatusReq x Requests the status of the end-device
0x06 DevStatusAns x Returns the status of the end-device, namely
its battery level and its demodulation margin
0x07 NewChannelReq x Creates or modifies the definition of a radio
channel
0x07 NewChannelAns x Acknowledges a NewChannelReq command
0x08 RXTimingSetupReq x Sets the timing of the of the reception slots
0x08 RXTimingSetupAns x Acknowledges RXTimingSetupReq
command
0x09 TxParamSetupReq x Used by the network server to set the
maximum allowed dwell time and Max EIRP
of end-device, based on local regulations
0x09 TxParamSetupAns x Acknowledges TxParamSetupReq command
0x0A DlChannelReq x Modifies the definition of a downlink RX1
radio channel by shifting the downlink
frequency from the uplink frequencies (i.e.
creating an asymmetric channel)
0x0A DlChannelAns x Acknowledges DlChannelReq command

©2016 LoRa™ Alliance Page 22 of 70

The authors reserve the right to change specifications without notice.

LoRaWAN Specification
CID Command Transmitted by Short Description
End- Gateway
device
0x80 Proprietary x x Reserved for proprietary network command
to extensions
1 0xFF
Table 4: MAC commands
2 Note: The length of a MAC command is not explicitly given and must
3 be implicitly known by the MAC implementation. Therefore unknown
4 MAC commands cannot be skipped and the first unknown MAC
5 command terminates the processing of the MAC command sequence.
6 It is therefore advisable to order MAC commands according to the
7 version of the LoRaWAN specification which has introduced a MAC
8 command for the first time. This way all MAC commands up to the
9 version of the LoRaWAN specification implemented can be processed
10 even in the presence of MAC commands specified only in a version of
11 the LoRaWAN specification newer than that implemented.
12
13 Note: Any values adjusted by the network server (e.g., RX2, new or
14 adjusted channels definitions) remain only valid until the next join of
15 the end-device. Therefore after each successful join procedure the
16 end-device uses the default parameters again and it is up to the
17 network server to re-adjust the values again as needed.

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