The IEEE Transactions on Cognitive Communications and Networking (TCCN) is committed to timely publishing of high-quality manuscripts that advance to the state-of-the-art of cognitive communications and networking research. Cognitive in this context means the applications of perception, learning, reasoning, memory and adaptive approaches in the design of communication systems. The transactions considers submissions in the broad area of cognitive communications and networks, with an emphasis on taking holistic and possibly trans-disciplinary approach on design of complex communications systems. The core topics covered include (but are not limited to): architecture, protocols, cross-layer, and cognition cycle design for cognitive networks, machine learning and artificial intelligence for cognitive communications and networks, end-to-end and distributed intelligence at and beyond all layers of communications, software-defined networking, cognitive radios, spectrum sharing, trading and relevant economical aspects of networks, security and privacy issues in cognitive networks, novel emerging services and applications enabled by such concepts.