Resource Allocation for Transmission Delay Minimization in Wireless Powered Communication Systems

Wirless powered communication (WPC) systems are a new type of communication systems which use wireless channel for both energy harvesting and data transmission. WPC systems are recently considered in literatures. In this type of telecommunications, delay transmission includes the time duration of both power transfer and data transmission. In the downlink (DL) phase, the power transfers from the base station to the node and in the uplink (UL) phase, the data is transmitted from the node to the base station. Minimization of transmission delay using the optimal time durations and the optimal allocated power at the base station is the goal of our paper. For this purpose, we define and solve two optimization problems and compare the results. In the first problem, an equal time durarion in the DL and UL phases and also the optimal power allocation at the base station are assumed. Then, in the second problem, a more general case with an unequal DL and UL time duration and optimal power allocation strategy at the base statio are considered.