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Delay Minimization for Hybrid BAC-NOMA Offloading in MEC Networks

Haodong Li

TL;DR

Simulation results show that the proposed BAC-NOMA protocol outperforms the benchmark in terms of offloading delay.

Abstract

This paper studies the offloading service improvement of multi-access edge computing (MEC) based on backscatter communication (BackCom) assisted non-orthogonal multiple access (BAC-NOMA). A hybrid BAC-NOMA protocol is proposed, where the uplink users backscatter their tasks by leveraging the downlink signal, and then the remaining data is transmitted through uplink NOMA. In particular, a resource allocation problem is formulated to minimize the offloading delay of uplink users. The non-convex problem is transformed into a convex problem, and an iterative algorithm is developed accordingly. Simulation results show that the proposed protocol outperforms the benchmark in terms of offloading delay.

Delay Minimization for Hybrid BAC-NOMA Offloading in MEC Networks

TL;DR

Simulation results show that the proposed BAC-NOMA protocol outperforms the benchmark in terms of offloading delay.

Abstract

This paper studies the offloading service improvement of multi-access edge computing (MEC) based on backscatter communication (BackCom) assisted non-orthogonal multiple access (BAC-NOMA). A hybrid BAC-NOMA protocol is proposed, where the uplink users backscatter their tasks by leveraging the downlink signal, and then the remaining data is transmitted through uplink NOMA. In particular, a resource allocation problem is formulated to minimize the offloading delay of uplink users. The non-convex problem is transformed into a convex problem, and an iterative algorithm is developed accordingly. Simulation results show that the proposed protocol outperforms the benchmark in terms of offloading delay.
Paper Structure (9 sections, 1 theorem, 20 equations, 2 figures, 1 algorithm)

This paper contains 9 sections, 1 theorem, 20 equations, 2 figures, 1 algorithm.

Table of Contents

  1. Introduction
  2. System Model and Problem Formulation
  3. System Model
  4. Problem Formulation
  5. Problem Transformation and Solution
  6. Pure BAC-NOMA Case
  7. Hybrid BAC-NOMA Case
  8. Simulation Results
  9. Conclusion

Key Result

Lemma 1

Define $\tilde{L}=\sum^{K}_{k=1} L_k$, $t_a$ is equivalent to the following expression: where $R^{b} = \sum^{K}_{k=1} r_{b,k}$ and $R^{a} = \sum^{K}_{k=1} r_{a,k}$.

Figures (2)

  • Figure 1: The convergence performance and delay comparison.
  • Figure 2: Average offloading delay by hybrid offloading and pure NOMA uplink transmission as a function of offloading data length.

Theorems & Definitions (2)

  • Lemma 1
  • proof