You need to set up a Subversion server, preferably on a server that's online all the time. Do not access a repository over a network connection in the same way that you would if it was on your local hard drive (file:///
URL).
Once you have a server configured, neither the server nor the client know or care whether you're on a wired or wireless connection.
There are several links listed under "related" on the right side here which discuss this.