Wouldn’t or not it’s good if your house router (CPE) may use DSL (or slow-speed fibre) and LTE connection on the identical time? Even higher: run a single TCP session over each hyperlinks? The reply to each questions is YES, after all it may try this, if solely your service supplier could be concerned about providing you with that choice.
We solved comparable issues with multilink PPP within the networking antiquity, right now you might use a CPE with an MP-TCP proxy mixed with a Hybrid Entry Gateway within the service supplier community. For extra particulars, learn the wonderful Rising broadband attain with Hybrid Entry Networks article by prof. Olivier Bonaventure and his staff.