A survey on cognitive machine-to-machine communications

As machine-to-machine (M2M) communication is growing and number of connected devices is increasing, the electromagnetic pollution and interference become critical issues due to limited spectrum resources. The M2M deployment facing challenges that need to be solved in a way with optimal spectrum utilization in mind. This paper focuses on how cognitive M2M (CM2M) can improve the efficiency of M2M communication systems by dealing with the spectrum scarcity and improving the large scale M2M applications. The survey highlights spectrum sharing and service layering models of CM2M, and then provides insights on key technologies such as spectrum access and game theoretical approaches.