1. Wireless sensor networks have recently received increased attention in the industrial communications community and the protocol design issues that are relevant for industrial applications.
2. Techniques to mitigate channel fading and external interferences(two of the main reasons for the bad quality of the wireless channel) that are currently hot topics in the wireless communications community and from which the industrial networking community can significantly benefit.
There are many hot topics in wireless communication networks, i have mentioned some of them :
EVERYWHERE CONNECTIVITY FOR IoT & IoE (Internet of Things) is the hot trend of today’s wireless researching and it will be trending for 2 or 3 years. The mighty technology will let you control your every personal thing just from your smartphone.
5G networks is probably the "catch most term" for many of them.