Will the existing fading models, modulation formats and coding techniques applicable for D2D communication? To what extent will it address the problems like energy efficiency and network spectral efficiency?
Is it possible to initiate and carry out out-of-coverage D2D communication in true sense?
The existing fading models or modulation and coding techniques are applicable for D2D communiation whether any approach is considered such as mobile adhoc networks etc. The point that matters is the dynamism of device, data severity and wireless techniques involved.
As far as energy efficiency and spectral efficiency is concerned, cognition is the key to address these problems including cognitive radio for spectral efficiency.
Initiating and carrying out out-of-coverage D2D communication can be made possible by different approached like femtocells and relaying.
It is a great technique - if carefully designed - for load balancing, offloading and caching to ease front/back haul segments of the mobile/wireless networks (increase decentralization and push further decision making at the edge).
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