  The 4G/5G paradigm offers User Equipment (UE) simultaneous connectivity to a
plurality of wireless Access Points (APs). We consider a UE communicating with
its destination through multiple uplinks operating on orthogonal wireless
channels with unequal bandwidth. The APs are connected via a tree-like backhaul
network with destination at the root and non-ideal link capacities. We develop
a power allocation scheme that achieves a near-optimal rate without explicit
knowledge of the backhaul network topology at transmitter side. The proposed
algorithm waterfills a dynamic subset of uplinks using a low-overhead backhaul
load feedback.
