Downloading an Offline Map feature on UE (eLTE 3.4)
This is process:

Note: An offline map must be uploaded to the server for the UE to download.
An offline map supports
1. Display of location information on an offline map (online maps not supported)
2. Resumable download
Note: The server does not inform users of updates in the map. Users must update the map manually.

I hope this info is helpful for you :)