TR8-1.0.0 European Roaming Guidelines
©2021 LoRa Alliance
®
Page 7 of 9
The authors reserve the right to change
documents without notice.
3.3 Channel Modifications when Roaming 130
There are 3 possible roaming device movement scenarios, as depicted in Figure 2. 131
132
133
134
Figure 2: Roaming Situations 135
3.3.1 From Home Network to Visited Network 136
When the home NS detects that the device is roaming (the device moves from home 137
coverage to visited coverage), the home NS receives a PRStartReq for this device via the 138
backend interface. There are then 2 possible outcomes: 139
140
• If the visited network channel plan is included in the home network channel plan, the 141
home network sends a LinkADRReq command to modify the Channel Mask (to 142
change the mask and not the channels). 143
144
• If the visited network channel plan is different from the home network channel plan, 145
the home network sends a NewChannelReq to the device to add or modify the 146
necessary channels. 147
3.3.2 From Visited Network to Home Network 148
Same procedure as in Section 3.3.1 using the channel plan of the home network. 149
3.3.3 From Visited Network to Another Visited Network 150
Same procedure as in Section 3.3.1 using the channel plan of the new visited network. 151
