Centralized QoS-Aware Resource Allocation for D2D Communications with Multiple D2D Pairs in One Resource Block

TL;DR

This paper proposes a centralized resource allocation method for D2D communications that enhances spectral efficiency by allowing multiple D2D pairs to reuse a single resource block while ensuring QoS for cellular users.

Contribution

It introduces a novel joint power and spectrum allocation algorithm that supports multiple D2D pairs per resource block with reduced complexity and signaling overhead.

Findings

Significant improvement in spectral efficiency over single D2D pair reuse.

Near-optimal performance with lower complexity and signaling.

Effective QoS guarantees for cellular and D2D users.

Abstract

Device-to-device (D2D) communications can result in spectral efficiency (SE) improvement of cellular networks when interference is addressed properly. For further improvement of overall network sum-rate, it can be assumed that multiple D2D pairs reuse the same resource block (RB) of a cellular user equipment (CUE). In this paper, we study a centralized joint power and spectrum resource allocation problem to maximize the overall sum-rate of the network while guaranteeing the quality-of-service (QoS) requirements of CUEs and admitted D2D pairs. The proposed method uses a distance based approach to select a CUE at each step with a distance and power based approach to increase the number of admitted D2D pairs. A power minimization approach when the number of admitted D2D pairs are increasing and a power maximization approach at the end of resource allocation for each RB is proposed. Numerical results show that the proposed algorithm significantly improves SE compared to the situation where at most one D2D pair can reuse the RB of a CUE. It also shows that the proposed algorithm has a slight lower performance compared to the optimal scheme but dramatically decreases the matching complexity and signaling overhead.