IEEE 802 group have their own presentation on the co-existence lessons learned.  This is embedded below:

Ericsson has also got a recent presentation on this topic.  As can be seen, they expect a solution to be available in 2016-17.  Presentation embedded below (download link here)

Finally, if you watched the video by Ericsson, they mention that one of the key milestones of 5G is to be able to combine licensed and unlicensed technology.  One of the technologies being proposed in 5G is called Multi-Stream Aggregation (MSA).  MSA allows multiple access technologies over licensed and unlicensed bands effectively.  The picture above shows how it would work in theory.  It may be more difficult in practise though.