Issue link: https://read.uberflip.com/i/1428395
LoRaWAN ® L2 1.0.4 Specification © 2020 LoRa Alliance ® Page 36 of 90 The authors reserve the right to change specifications without notice. 5.6 Creation / Modification of a Channel (NewChannelReq, 1118 NewChannelAns, DlChannelReq, DlChannelAns) 1119 End-devices and Network Servers SHALL implement these commands, unless an end-device 1120 is operating in a region where a fixed channel plan is defined, in which case these commands 1121 SHALL NOT be implemented. Please refer to "LoRaWAN Regional Parameters" [RP002] for 1122 applicable regions. 1123 1124 A Network Server can use the NewChannelReq command either to create a new bidirectional 1125 channel or to modify the parameters of an existing one. The command sets the center 1126 frequency of the new channel and the range of uplink data rates that are usable on this 1127 channel: 1128 1129 Size (octets) 1 3 1 NewChannelReq payload ChIndex Frequency DRRange Table 34: NewChannelReq payload format 1130 1131 1132 The channel index (ChIndex) is the index of the channel being created or modified. 1133 Depending on the region and frequency band, the "LoRaWAN Regional Parameters" [RP002] 1134 document imposes default channels, which SHALL be common to all end-devices and SHALL 1135 NOT be modified by the NewChannelReq command. If the number of default channels is N, 1136 the default channels go from 0 to N−1, and the acceptable range for ChIndex is N to 15. An 1137 end-device SHALL be able to handle at least 16 different channel definitions. In certain 1138 regions, the end-device SHALL have to store more than 16 channel definitions. 1139 The Frequency field is a 24-bit unsigned integer. The actual channel frequency (in Hz) is 1140 100 × Frequency, whereby values representing frequencies below 100 MHz are reserved 1141 for future use. This allows the frequency of a channel to be set anywhere from 100 MHz to 1142 1.67 GHz in increments of 100 Hz. A Frequency value of 0 disables the channel. The end- 1143 device SHALL check that the frequency is allowed by its radio hardware and SHALL NOT set 1144 the channel frequency bit in the Status field of the answer if the end-device cannot use this 1145 frequency (see below). 1146 1147 1148 1149 The data-rate range (DRRange) field specifies the uplink data-rate range allowed for this 1150 channel. The field is split in two 4-bit indexes: 1151 1152 Bits 7:4 3:0 DRRange MaxDR MinDR Table 35: DRRange field format 1153 1154 1155 The minimum data rate (MinDR) subfield designates the lowest uplink data rate allowed on 1156 this channel. The maximum data rate (MaxDR) designates the highest uplink data rate. The 1157 mapping of data rate index to physical layer is defined in [RP002] for each region. 1158