Improving Quality of Service for Cell-Edge Users in D2D-Relay Networks

Abstract

In this paper, we build a D2D-relay communications model where the D2D user is selected as a relay to forward data for the users at the edge of the networks. We aim at maximizing the achievable data rates of the cell-edge users, a resource allocation problem is formulated and an iterative power allocation algorithm is proposed. We derive the optimal closed-form power allocation expressions by the Lagrange dual method. Simulation results show that our communication scheme can achieve greater spectral efficiency than the traditional cellular-relay communication scheme.

Statistical Analysis of Connectivity Enhancement for Cell-Edge Users in Wireless Cellular Networks Using Cooperative Non- Orthogonal Multiple Access (CNOMA)

“…Additionally, [1] explores the performance of NOMAbased full-duplex IoT relay systems with SWIPT over Nakagami-m fading channels, deriving closed-form expressions for system throughput, energy efficiency, and ergodic capacities. Another study, [10], examines two transmission scenarios for serving cell-edge users in cellular networks, utilizing a transmit antenna selection (TAS) policy to significantly enhance system performance in NOMA networks. Moreover, [9] introduces a D2D-relay communication model to elevate cell-edge user coverage quality, formulating a resource allocation problem and proposing an iterative power allocation algorithm.…”