Energy-Optimal Computational Offloading for Simplified Multiple Access Schemes

Computation offloading is a promising approach to reducing the energy consumption or application execution time in mobile devices. In this paper, we consider a system in which two users offload their latency-constrained applications to a single access point. The system has a three time slot structure in which the users transmit simultaneously or separately, and we determine quasi-closed-form expressions for the transmission powers, the rates and the duration of each time slot to minimize the energy consumption of such a system when the simplified multiple access schemes time-division multiple access (TDMA), sequential decoding (without time sharing) and independent decoding are employed in the first time slot. The results enable us to examine how the shape of the achievable rate region of the chosen multiple access scheme influences the performance of that scheme under different conditions.