  We consider wireless backhauling for a scenario where two small-cell base
stations (SC-BSs) employ the same time and frequency resources for offloading
their data to a common macro-cell base station (MC-BS). The two SC-BSs allocate
a part of the shared resource to exchange data in order to be able to cooperate
to boost the backhaul capacity. For this scenario, we develop the optimal
transmission strategy which, based on the channel state information, determines
whether the SC-BSs should exchange data and cooperate or transmit their data
independently to the MC-BS. Our numerical results demonstrate the superiority
of the proposed cooperative~wireless backhauling protocol compared to existing
protocols in the literature.
