Dynamic user-AP association for QoS-aware CSMA in wireless virtualized networks

摘要

In this paper, we investigate the dynamic user-AP association with QoS-aware CSMA in a virtualized wireless network. In particular, to efficiently support slice isolation, we consider an enhanced CSMA frame with two phases: a contention-free A-phase using CSMA with deterministic back-off, followed by a contention-based C-phase using p-persistent CSMA. The user scheduling in the contention-free A-phase and determination of p values for the contention-based C-phase along with the user-AP association are formulated as an optimization problem, aiming to maximize the overall network throughput under the slice isolation constraints and channel conditions. Subsequently, complementary geometric programming (CGP) and monomial approximations are used to develop an iterative algorithm for solution. Illustrative simulation results show the efficiency of the developed solution and its effect on network performance while maintaining the isolation among slices.