The outdoor gateway with solar will be the same as the mobile with 3/4G, sans the GPS.
So the grouping for gateway interface boards is more like this:
- lab/desktop for testing/trialing
- standalone with WiFi or 3/4G backhaul with battery protection (LVD) and optional solar charge controller/GPS
- urban with PoE backhaul
Outdoor or not is then determined by enclosure/antenna choice really.