15.3 Beacon GwSpecific field format
- The content of the GwSpecific field is as follow:
| Size (bytes) | 1 | 6 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| GwSpecific | InfoDesc | Info | ||||||||
| 22 | The information descriptorInfoDesc | describes how the | information field Info shall be | |||||||
| 23 | interpreted. | |||||||||
| 24 | ||||||||||
| InfoDesc | Meaning | |||||||||
| 0 | GPS coordinate of the gateway first | |||||||||
| antenna | ||||||||||
| 1 | GPS coordinate of the gateway second | |||||||||
| antenna | ||||||||||
| 2 | GPS coordinate of the gateway third | |||||||||
| antenna | ||||||||||
| 3:127 | RFU | |||||||||
| 128:255 | Reserved for custom network specific | |||||||||
| broadcasts | ||||||||||
- For a single omnidirectional antenna gateway the InfoDesc value is 0 when broadcasting
- GPS coordinates. For a site featuring 3 sectored antennas for example, the first antenna
- broadcasts the beacon with InfoDesc equals 0, the second antenna with InfoDesc field
- equals 1, etc …
©2016 LoRa™ Alliance Page 53 of 70
The authors reserve the right to change specifications without notice.
LoRaWAN Specification
15.3.1 Gateway GPS coordinate:InfoDesc = 0, 1 or 2
- For InfoDesc = 0 ,1 or 2, the content of the Info field encodes the GPS coordinates of the
- antenna broadcasting the beacon
| Size (bytes) | 3 | 3 | ||||
|---|---|---|---|---|---|---|
| Info | Lat | Lng | ||||
| 4 | The latitude and longitude fields (Lat and Lng, respectively) encode the geographical | |||||
| 5 | location of the gateway as follows: | |||||
| 6 | The north-south latitude is encoded using | a signed 24 bit word where -223 |
- corresponds to 90° south (the South Pole) and 223 corresponds to 90° north (the
- North Pole). The equator corresponds to 0.
9 The east-west longitude is encoded using a signed 24 bit word where -
- 223corresponds to 180° west and 223 corresponds to 180° east. The Greenwich
- meridian corresponds to 0.