Environment-Aware Minimum-Cost Wireless Backhaul Network Planning with Full-Duplex Links

TL;DR

This paper presents a joint design approach for wireless backhaul networks that optimizes topology and resource allocation using full-duplex links, leading to cost reductions and improved spectral efficiency.

Contribution

It introduces a MILP model for cost-efficient network design with FD links and a re-tuning algorithm for adapting to network changes, enhancing existing methods.

Findings

Cost reduction achieved through FD link coexistence

Effective re-tuning algorithm for network adjustments

Improved spectral efficiency in backhaul networks

Abstract

In this work, we address the joint design of the wireless backhauling network topology as well as the frequency/power allocation on the wireless links, where nodes are capable of full-duplex (FD) operation. The proposed joint design enables the coexistence of multiple wireless links at the same channel, resulting in an enhanced spectral efficiency. Moreover, it enables the usage of FD capability when/where it is gainful. In this regard, a mixed-integer-linear-program (MILP) is proposed, aiming at a minimum cost design for the wireless backhaul network, considering the required rate demand at each base station. Moreover, a re-tunning algorithm is proposed which reacts to the slight changes in the network condition, e.g., channel attenuation or rate demand, by adjusting the transmit power at the wireless links. In this regard, a successive inner approximation (SIA)- based design is proposed, where in each step a convex subproblem is solved. Numerical simulations show a reduction in the overall network cost via the utilization of the proposed designs, thanks to the coexistence of multiple wireless links on the same channel due to the FD capability.