Abstract
Wireless fidelity (WiFi) and long term evolution (LTE) coexistence
system has attracted significant attention recently.
However, most studies on coexistence only consider the issues about
downlink performance and fairness between WiFi network and LTE network.
In this paper, we take a comprehensive consideration of both the
performance of WiFi and LTE, to propose a downlink/uplink decoupling
(DUDe) scheme for the fairness of the coexistence system.
Through the process of modeling construction, problem formulation with
reformulation, solution and simulations, we illustrate that DUDe can
achieve proportional fairness in terms of sum throughput and load
balancing between uplink and downlink.
In our decoupling model for coexistence between WiFi and LTE, resource
allocation is under adaptive spectrum partitioning and users can access
each network of WiFi and LTE.
Moreover, to make our proposal more realistic, we adopt support vector
machine (SVM) to predict the total number of users in WiFi and LTE
coexistence system, where the predictive simulation shows its high
prediction accuracy with low complexity. We further apply the prediction
results to the optimization problem of DUDe.
Simulation results manifest that the proposed DUDe scheme has better
performance in terms of sum throughput.
The sum throughput of DUDe scheme can come up to almost twice more than
that of coupled association scheme.
The result shows that DUDe can also achieve load balance between uplink
and downlink in the coexistence system.