Partially-Distributed Resource Allocation Scheme for Cellular-Based Vehicle-to-Infrastructure Communications

Abstract

In this paper, we study the max-min throughput problem in a multi-road side units (RSU) network where multiple RSUs in the coverage of a base station (BS) transmit data to the vehicular users (VUEs), while considering the inter-cell interferences among RSUs and the imperfect channel state information (CSI). Our goal is to maximize the minimal throughput of the system-wide vehicle-to-infrastructure (V2I) link, by jointly optimizing the transmit power of RSUs and allocating the resource blocks (RBs). As the formulated original problem is a nondeterministic polynomial-time (NP)-hard problem and is hard to solve, we decompose it into two subproblems, namely the resource block (RB) allocation subproblem with fixed RSU’s transmit power, which includes a resource blocks pool (RBP) division for each RSU and a further RB allocation, and the transmit power optimization subproblem with fixed RB allocation. Considering the computation complexity of the base station (BS), we propose a partially-distributed scheme, letting the BS takes the charge of RBP division while the further RB allocation and power control are accomplished by each RSU. We formulate the channel fading factor to reduce the influence caused by imperfect CSI and propose a VUE equivalent method, thus making the RB allocation subproblem easy to solve. Simulation results are provided to support our work.