LoRaWAN® Regional Parameters RP002-1.0.4
©2022 LoRa Alliance
®
Page 95 of 101
The authors reserve the right to change
specifications without notice.
4.4.4 Relay Receive Window (RXR) – Physical Parameters 1931
To receive a downlink on RX relay windows, an end-device SHALL configure the LoRa 1932
physical layer as follows: 1933
Parameter Value
Preamble size 8 symbols
Sync Word 0x34 (public)
Header type Explicit
CRC presence True
Coding Rate 4/5
IQ polarization Inverted
Frequency Same as WOR frame
Data rate Same as LoRaWAN uplink
Table 112: RXR physical layer settings 1934
4.4.5 Default Relay Settings 1935
The following parameters are the values for all regions: 1936
TRUSTED_ED_NUMBER 16 1937
WOR_ATTEMPTS_WO_ACK 8 1938
WOR_DATA_DELAY 50 milliseconds 1939
WOR_ACK_DELAY 50 milliseconds 1940
RELAY_FWD_DELAY 50 milliseconds 1941
RXR_DELAY 18 seconds 1942
Note: These timings have been chosen to be compatible with Listen 1943
Before Talk. 1944
The time-on-air of the WOR ACK is dependent on the SF and bandwidth. The following 1945
tableError! Reference source not found. represents the different possible values: 1946
Time-On-Air [ms] BW125 BW250 BW500
SF7 36.0 27.2 9.0
SF8 72.1 36.0 18.0
SF9 123.9 61.9 30.9
SF10 247.8 123.9 61.9
SF11 495.6 247.8 123.9
SF12 991.2 495.6 247.8
Table 113: Time-on-air of WOR ACK 1947
1948
