  The concept of user-centric and personalized service in the fifth generation
(5G) mobile networks encourages technical solutions such as dynamic asymmetric
uplink/downlink resource allocation and elastic association of cells to users
with decoupled uplink and downlink (DeUD) access. In this paper we develop a
joint uplink and downlink optimization algorithm for DeUD-enabled wireless
networks for adaptive joint uplink and downlink bandwidth allocation and power
control, under different link association policies. Based on a general model of
inter-cell interference, we propose a three-step optimization algorithm to
jointly optimize the uplink and downlink bandwidth allocation and power
control, using the fixed point approach for nonlinear operators with or without
monotonicity, to maximize the minimum level of quality of service satisfaction
per link, subjected to a general class of resource (power and bandwidth)
constraints. We present numerical results illustrating the theoretical findings
for network simulator in a real-world setting, and show the advantage of our
solution compared to the conventional proportional fairness resource allocation
schemes in both the coupled uplink and downlink (CoUD) access and the novel
link association schemes in DeUD.
