Power Control and Scheduling In Low SNR Region In The Uplink of Two Cell Networks

TL;DR

This paper proposes a novel method for sub-channel assignment and power control in two-cell uplink networks operating in low SNR conditions, maximizing sum rate through a tractable optimization approach.

Contribution

It introduces a reformulation of the joint sub-channel and power control problem into manageable sub-problems solvable by Hungarian algorithm and quadratic fractional programming.

Findings

Proposed method outperforms existing approaches in low SNR scenarios.

Reformulation enables efficient solution to a complex non-convex optimization problem.

Numerical results validate the effectiveness of the approach.

Abstract

In this paper we investigate the sub-channel assignment and power control to maximize the total sum rate in the uplink of two-cell network. It is assumed that there are some sub-channels in each cell which should be allocated among some users. Also, each user is subjected to a power constraint. The underlying problem is a non-convex mixed integer non-linear optimization problem which does not have a trivial solution. To solve the problem, having fixed the consumed power of each user, and assuming low co-channel interference region, the sub-channel allocation problem is reformulate into a more mathematically tractable problem which is shown can be tackled through the so-called Hungarian algorithm. Then, the consumed power of each user is reformulated as a quadratic fractional problem which can be numerically derived. Numerical results demonstrate the superiority of the proposed method in low SNR region as compared to existing works addressed in the literature