On the Application of BAC-NOMA to 6G umMTC

TL;DR

This paper explores BAC-NOMA, a novel transmission scheme for 6G umMTC that enables simultaneous energy and spectrum sharing, with optimized resource allocation to enhance uplink throughput and reduce interference.

Contribution

It introduces BAC-NOMA for 6G umMTC, combining backscatter communications with NOMA, and develops an optimal resource allocation strategy for improved performance.

Findings

BAC-NOMA achieves higher uplink throughput.

The proposed resource allocation effectively suppresses interference.

Simulations confirm superior performance of BAC-NOMA.

Abstract

This letter studies the application of backscatter communications (BackCom) assisted non-orthogonal multiple access (BAC-NOMA) to the envisioned sixth-generation (6G) ultra-massive machine type communications (umMTC). In particular, the proposed BAC-NOMA transmission scheme can realize simultaneous energy and spectrum cooperation between uplink and downlink users, which is important to support massive connectivity and stringent energy constraints in umMTC. Furthermore, a resource allocation problem for maximizing the uplink throughput and suppressing the interference between downlink and uplink transmission is formulated as an optimization problem and the corresponding optimal resource allocation policy is obtained. Computer simulations are provided to demonstrate the superior performance of BAC-NOMA.