  The unprecedented growth of internet contents, specially social media,
invoking a challenge to the load of cellular networks. In addition, nowadays,
the demands of quality of experience (QoE) became a more practical norm in
contrast of quality of service (QoS), in which downloading delay is an
important factor of it. To satisfy this demand, we propose two resource
allocation (RA) algorithms to optimize the place of social media in the cache
of the Base stations (BSs) and radio resources (i.e., transmit powers and
subcarriers), jointly in a multi-cell Orthogonal Frequency Division Multiple
Access (OFDMA) based system. In the first scheme, the total downloading delay
of the network is minimized, while in the second scheme, a fairness-aware
scheme is proposed in which the maximum downloading delays is minimized. We
propose iterative algorithms to solve each problem, where the content placement
problem and the joint subcarrier and transmit power allocation problem will be
iteratively optimized. We also prove that the proposed approaches converges to
a near-optimal solution, as well as the number of iterations increases.
