Joint uplink/downlink fair power allocation for wireless backhaul of vehicular small cells

This paper proposes a two-part joint uplink/downlink power allocation for the backhaul of the vehicular small cell, one part for the uplink and another part for the downlink. In the first part of the proposed algorithm, after macro base station assignment for each small base station, we allocate the transmission power using the pilot assisted approach in the uplink direction. Simultaneously, using a normalizing factor obtained from the first part of the algorithm, which is representing the SINR balancing level of the small cell layer in the uplink direction, the second part is implemented using the Foschini concept to achieve the SINR balancing in the downlink direction just equal to that in the uplink direction. Therefore, the same levels for the SINR balancing are fairly obtained jointly for the macrocell and small cell layers in the downlink and uplink directions, respectively. Then, we provide some analysis on the convergence of the proposed algorithm in both parts of the uplink and downlink. In contrast to previous works, it is not required to be solved a non-convex optimization problem for the implementation of our proposed algorithm. Simulation results illustrate that the proposed scheme converges to the SINR balancing level after a few iterations in both uplink and downlink directions of the backhaul link.