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Multi-radio multi-channel (MR-MC) networks contribute significant enhancementin the network throughput by exploiting multiple radio interfaces andnon-overlapping channels. While throughput optimization is one of the maintargets in allocating resource in MR-MC networks, recently, the network energyefficiency is becoming a more and more important concern. Although turning onmore radios and exploiting more channels for communication is always beneficialto network capacity, they may not be necessarily desirable from an energyefficiency perspective. The relationship between these two often conflictingobjectives has not been well-studied in many existing works. In this paper, weinvestigate the problem of optimizing energy efficiency under full capacityoperation in MR-MC networks and analyze the optimal choices of numbers ofradios and channels. We provide detailed problem formulation and solutionprocedures. In particular, for homogeneous commodity networks, we derive atheoretical upper bound of the optimal energy efficiency and analyze theconditions under which such optimality can be achieved. Numerical resultsdemonstrate that the achieved optimal energy efficiency is close to thetheoretical upper bound.

On Optimizing Energy Efficiency in Multi-Radio Multi-Channel Wireless Networks