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In this paper, the problem of minimizing total Energy Consumption (EC) of the machine-to-machine system embedded in an OFDMA cellular network is addressed in flat-fading and frequency-selective fading channels. The authors characterize energy consumption of the M2M system and propose Massive Access Management (MAM) schemes, which jointly implement Machine Device (MD) clustering and coordinator selection under 2-hop transmission architecture in the flat-fading environment. Moreover, a joint MAM and Resource Allocation (RA) scheme is proposed for minimizing total energy consumed in the frequency selective fading environment, which performs subcarrier assignment and power allocation optimization together for coordinators after executing MD grouping and coordinator selection.
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